crypto: ecdh - Add ECDH software support

* Implement ECDH under kpp API
 * Provide ECC software support for curve P-192 and
   P-256.
 * Add kpp test for ECDH with data generated by OpenSSL

Signed-off-by: Salvatore Benedetto <salvatore.benedetto@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/crypto/Kconfig b/crypto/Kconfig
index 162d2f9aa242536d816c26ce69cc6ddc14599e08..5baaa9d87574cbf2288813a98c8e29746858a17e 100644 (file)
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -118,6 +118,11 @@ config CRYPTO_DH
        help
          Generic implementation of the Diffie-Hellman algorithm.
 
+config CRYPTO_ECDH
+       tristate "ECDH algorithm"
+       select CRYTPO_KPP
+       help
+         Generic implementation of the ECDH algorithm
 
 config CRYPTO_MANAGER
        tristate "Cryptographic algorithm manager"

diff --git a/crypto/Makefile b/crypto/Makefile
index 82897208e8e035eadd43b1c2439efd786acc1f71..df1bcfb090d21d3135dca66417eedd35797aca42 100644 (file)
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -35,6 +35,10 @@ obj-$(CONFIG_CRYPTO_KPP2) += kpp.o
 dh_generic-y := dh.o
 dh_generic-y += dh_helper.o
 obj-$(CONFIG_CRYPTO_DH) += dh_generic.o
+ecdh_generic-y := ecc.o
+ecdh_generic-y += ecdh.o
+ecdh_generic-y += ecdh_helper.o
+obj-$(CONFIG_CRYPTO_ECDH) += ecdh_generic.o
 
 $(obj)/rsapubkey-asn1.o: $(obj)/rsapubkey-asn1.c $(obj)/rsapubkey-asn1.h
 $(obj)/rsaprivkey-asn1.o: $(obj)/rsaprivkey-asn1.c $(obj)/rsaprivkey-asn1.h

diff --git a/crypto/ecc.c b/crypto/ecc.c
new file mode 100644 (file)
index 0000000..9aedec6
--- /dev/null
+++ b/crypto/ecc.c
@@ -0,0 +1,1018 @@
+/*
+ * Copyright (c) 2013, Kenneth MacKay
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *  * Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <linux/random.h>
+#include <linux/slab.h>
+#include <linux/swab.h>
+#include <linux/fips.h>
+#include <crypto/ecdh.h>
+
+#include "ecc.h"
+#include "ecc_curve_defs.h"
+
+typedef struct {
+       u64 m_low;
+       u64 m_high;
+} uint128_t;
+
+static inline const struct ecc_curve *ecc_get_curve(unsigned int curve_id)
+{
+       switch (curve_id) {
+       /* In FIPS mode only allow P256 and higher */
+       case ECC_CURVE_NIST_P192:
+               return fips_enabled ? NULL : &nist_p192;
+       case ECC_CURVE_NIST_P256:
+               return &nist_p256;
+       default:
+               return NULL;
+       }
+}
+
+static u64 *ecc_alloc_digits_space(unsigned int ndigits)
+{
+       size_t len = ndigits * sizeof(u64);
+
+       if (!len)
+               return NULL;
+
+       return kmalloc(len, GFP_KERNEL);
+}
+
+static void ecc_free_digits_space(u64 *space)
+{
+       kzfree(space);
+}
+
+static struct ecc_point *ecc_alloc_point(unsigned int ndigits)
+{
+       struct ecc_point *p = kmalloc(sizeof(*p), GFP_KERNEL);
+
+       if (!p)
+               return NULL;
+
+       p->x = ecc_alloc_digits_space(ndigits);
+       if (!p->x)
+               goto err_alloc_x;
+
+       p->y = ecc_alloc_digits_space(ndigits);
+       if (!p->y)
+               goto err_alloc_y;
+
+       p->ndigits = ndigits;
+
+       return p;
+
+err_alloc_y:
+       ecc_free_digits_space(p->x);
+err_alloc_x:
+       kfree(p);
+       return NULL;
+}
+
+static void ecc_free_point(struct ecc_point *p)
+{
+       if (!p)
+               return;
+
+       kzfree(p->x);
+       kzfree(p->y);
+       kzfree(p);
+}
+
+static void vli_clear(u64 *vli, unsigned int ndigits)
+{
+       int i;
+
+       for (i = 0; i < ndigits; i++)
+               vli[i] = 0;
+}
+
+/* Returns true if vli == 0, false otherwise. */
+static bool vli_is_zero(const u64 *vli, unsigned int ndigits)
+{
+       int i;
+
+       for (i = 0; i < ndigits; i++) {
+               if (vli[i])
+                       return false;
+       }
+
+       return true;
+}
+
+/* Returns nonzero if bit bit of vli is set. */
+static u64 vli_test_bit(const u64 *vli, unsigned int bit)
+{
+       return (vli[bit / 64] & ((u64)1 << (bit % 64)));
+}
+
+/* Counts the number of 64-bit "digits" in vli. */
+static unsigned int vli_num_digits(const u64 *vli, unsigned int ndigits)
+{
+       int i;
+
+       /* Search from the end until we find a non-zero digit.
+        * We do it in reverse because we expect that most digits will
+        * be nonzero.
+        */
+       for (i = ndigits - 1; i >= 0 && vli[i] == 0; i--);
+
+       return (i + 1);
+}
+
+/* Counts the number of bits required for vli. */
+static unsigned int vli_num_bits(const u64 *vli, unsigned int ndigits)
+{
+       unsigned int i, num_digits;
+       u64 digit;
+
+       num_digits = vli_num_digits(vli, ndigits);
+       if (num_digits == 0)
+               return 0;
+
+       digit = vli[num_digits - 1];
+       for (i = 0; digit; i++)
+               digit >>= 1;
+
+       return ((num_digits - 1) * 64 + i);
+}
+
+/* Sets dest = src. */
+static void vli_set(u64 *dest, const u64 *src, unsigned int ndigits)
+{
+       int i;
+
+       for (i = 0; i < ndigits; i++)
+               dest[i] = src[i];
+}
+
+/* Returns sign of left - right. */
+static int vli_cmp(const u64 *left, const u64 *right, unsigned int ndigits)
+{
+       int i;
+
+       for (i = ndigits - 1; i >= 0; i--) {
+               if (left[i] > right[i])
+                       return 1;
+               else if (left[i] < right[i])
+                       return -1;
+       }
+
+       return 0;
+}
+
+/* Computes result = in << c, returning carry. Can modify in place
+ * (if result == in). 0 < shift < 64.
+ */
+static u64 vli_lshift(u64 *result, const u64 *in, unsigned int shift,
+                     unsigned int ndigits)
+{
+       u64 carry = 0;
+       int i;
+
+       for (i = 0; i < ndigits; i++) {
+               u64 temp = in[i];
+
+               result[i] = (temp << shift) | carry;
+               carry = temp >> (64 - shift);
+       }
+
+       return carry;
+}
+
+/* Computes vli = vli >> 1. */
+static void vli_rshift1(u64 *vli, unsigned int ndigits)
+{
+       u64 *end = vli;
+       u64 carry = 0;
+
+       vli += ndigits;
+
+       while (vli-- > end) {
+               u64 temp = *vli;
+               *vli = (temp >> 1) | carry;
+               carry = temp << 63;
+       }
+}
+
+/* Computes result = left + right, returning carry. Can modify in place. */
+static u64 vli_add(u64 *result, const u64 *left, const u64 *right,
+                  unsigned int ndigits)
+{
+       u64 carry = 0;
+       int i;
+
+       for (i = 0; i < ndigits; i++) {
+               u64 sum;
+
+               sum = left[i] + right[i] + carry;
+               if (sum != left[i])
+                       carry = (sum < left[i]);
+
+               result[i] = sum;
+       }
+
+       return carry;
+}
+
+/* Computes result = left - right, returning borrow. Can modify in place. */
+static u64 vli_sub(u64 *result, const u64 *left, const u64 *right,
+                  unsigned int ndigits)
+{
+       u64 borrow = 0;
+       int i;
+
+       for (i = 0; i < ndigits; i++) {
+               u64 diff;
+
+               diff = left[i] - right[i] - borrow;
+               if (diff != left[i])
+                       borrow = (diff > left[i]);
+
+               result[i] = diff;
+       }
+
+       return borrow;
+}
+
+static uint128_t mul_64_64(u64 left, u64 right)
+{
+       u64 a0 = left & 0xffffffffull;
+       u64 a1 = left >> 32;
+       u64 b0 = right & 0xffffffffull;
+       u64 b1 = right >> 32;
+       u64 m0 = a0 * b0;
+       u64 m1 = a0 * b1;
+       u64 m2 = a1 * b0;
+       u64 m3 = a1 * b1;
+       uint128_t result;
+
+       m2 += (m0 >> 32);
+       m2 += m1;
+
+       /* Overflow */
+       if (m2 < m1)
+               m3 += 0x100000000ull;
+
+       result.m_low = (m0 & 0xffffffffull) | (m2 << 32);
+       result.m_high = m3 + (m2 >> 32);
+
+       return result;
+}
+
+static uint128_t add_128_128(uint128_t a, uint128_t b)
+{
+       uint128_t result;
+
+       result.m_low = a.m_low + b.m_low;
+       result.m_high = a.m_high + b.m_high + (result.m_low < a.m_low);
+
+       return result;
+}
+
+static void vli_mult(u64 *result, const u64 *left, const u64 *right,
+                    unsigned int ndigits)
+{
+       uint128_t r01 = { 0, 0 };
+       u64 r2 = 0;
+       unsigned int i, k;
+
+       /* Compute each digit of result in sequence, maintaining the
+        * carries.
+        */
+       for (k = 0; k < ndigits * 2 - 1; k++) {
+               unsigned int min;
+
+               if (k < ndigits)
+                       min = 0;
+               else
+                       min = (k + 1) - ndigits;
+
+               for (i = min; i <= k && i < ndigits; i++) {
+                       uint128_t product;
+
+                       product = mul_64_64(left[i], right[k - i]);
+
+                       r01 = add_128_128(r01, product);
+                       r2 += (r01.m_high < product.m_high);
+               }
+
+               result[k] = r01.m_low;
+               r01.m_low = r01.m_high;
+               r01.m_high = r2;
+               r2 = 0;
+       }
+
+       result[ndigits * 2 - 1] = r01.m_low;
+}
+
+static void vli_square(u64 *result, const u64 *left, unsigned int ndigits)
+{
+       uint128_t r01 = { 0, 0 };
+       u64 r2 = 0;
+       int i, k;
+
+       for (k = 0; k < ndigits * 2 - 1; k++) {
+               unsigned int min;
+
+               if (k < ndigits)
+                       min = 0;
+               else
+                       min = (k + 1) - ndigits;
+
+               for (i = min; i <= k && i <= k - i; i++) {
+                       uint128_t product;
+
+                       product = mul_64_64(left[i], left[k - i]);
+
+                       if (i < k - i) {
+                               r2 += product.m_high >> 63;
+                               product.m_high = (product.m_high << 1) |
+                                                (product.m_low >> 63);
+                               product.m_low <<= 1;
+                       }
+
+                       r01 = add_128_128(r01, product);
+                       r2 += (r01.m_high < product.m_high);
+               }
+
+               result[k] = r01.m_low;
+               r01.m_low = r01.m_high;
+               r01.m_high = r2;
+               r2 = 0;
+       }
+
+       result[ndigits * 2 - 1] = r01.m_low;
+}
+
+/* Computes result = (left + right) % mod.
+ * Assumes that left < mod and right < mod, result != mod.
+ */
+static void vli_mod_add(u64 *result, const u64 *left, const u64 *right,
+                       const u64 *mod, unsigned int ndigits)
+{
+       u64 carry;
+
+       carry = vli_add(result, left, right, ndigits);
+
+       /* result > mod (result = mod + remainder), so subtract mod to
+        * get remainder.
+        */
+       if (carry || vli_cmp(result, mod, ndigits) >= 0)
+               vli_sub(result, result, mod, ndigits);
+}
+
+/* Computes result = (left - right) % mod.
+ * Assumes that left < mod and right < mod, result != mod.
+ */
+static void vli_mod_sub(u64 *result, const u64 *left, const u64 *right,
+                       const u64 *mod, unsigned int ndigits)
+{
+       u64 borrow = vli_sub(result, left, right, ndigits);
+
+       /* In this case, p_result == -diff == (max int) - diff.
+        * Since -x % d == d - x, we can get the correct result from
+        * result + mod (with overflow).
+        */
+       if (borrow)
+               vli_add(result, result, mod, ndigits);
+}
+
+/* Computes p_result = p_product % curve_p.
+ * See algorithm 5 and 6 from
+ * http://www.isys.uni-klu.ac.at/PDF/2001-0126-MT.pdf
+ */
+static void vli_mmod_fast_192(u64 *result, const u64 *product,
+                             const u64 *curve_prime, u64 *tmp)
+{
+       const unsigned int ndigits = 3;
+       int carry;
+
+       vli_set(result, product, ndigits);
+
+       vli_set(tmp, &product[3], ndigits);
+       carry = vli_add(result, result, tmp, ndigits);
+
+       tmp[0] = 0;
+       tmp[1] = product[3];
+       tmp[2] = product[4];
+       carry += vli_add(result, result, tmp, ndigits);
+
+       tmp[0] = tmp[1] = product[5];
+       tmp[2] = 0;
+       carry += vli_add(result, result, tmp, ndigits);
+
+       while (carry || vli_cmp(curve_prime, result, ndigits) != 1)
+               carry -= vli_sub(result, result, curve_prime, ndigits);
+}
+
+/* Computes result = product % curve_prime
+ * from http://www.nsa.gov/ia/_files/nist-routines.pdf
+ */
+static void vli_mmod_fast_256(u64 *result, const u64 *product,
+                             const u64 *curve_prime, u64 *tmp)
+{
+       int carry;
+       const unsigned int ndigits = 4;
+
+       /* t */
+       vli_set(result, product, ndigits);
+
+       /* s1 */
+       tmp[0] = 0;
+       tmp[1] = product[5] & 0xffffffff00000000ull;
+       tmp[2] = product[6];
+       tmp[3] = product[7];
+       carry = vli_lshift(tmp, tmp, 1, ndigits);
+       carry += vli_add(result, result, tmp, ndigits);
+
+       /* s2 */
+       tmp[1] = product[6] << 32;
+       tmp[2] = (product[6] >> 32) | (product[7] << 32);
+       tmp[3] = product[7] >> 32;
+       carry += vli_lshift(tmp, tmp, 1, ndigits);
+       carry += vli_add(result, result, tmp, ndigits);
+
+       /* s3 */
+       tmp[0] = product[4];
+       tmp[1] = product[5] & 0xffffffff;
+       tmp[2] = 0;
+       tmp[3] = product[7];
+       carry += vli_add(result, result, tmp, ndigits);
+
+       /* s4 */
+       tmp[0] = (product[4] >> 32) | (product[5] << 32);
+       tmp[1] = (product[5] >> 32) | (product[6] & 0xffffffff00000000ull);
+       tmp[2] = product[7];
+       tmp[3] = (product[6] >> 32) | (product[4] << 32);
+       carry += vli_add(result, result, tmp, ndigits);
+
+       /* d1 */
+       tmp[0] = (product[5] >> 32) | (product[6] << 32);
+       tmp[1] = (product[6] >> 32);
+       tmp[2] = 0;
+       tmp[3] = (product[4] & 0xffffffff) | (product[5] << 32);
+       carry -= vli_sub(result, result, tmp, ndigits);
+
+       /* d2 */
+       tmp[0] = product[6];
+       tmp[1] = product[7];
+       tmp[2] = 0;
+       tmp[3] = (product[4] >> 32) | (product[5] & 0xffffffff00000000ull);
+       carry -= vli_sub(result, result, tmp, ndigits);
+
+       /* d3 */
+       tmp[0] = (product[6] >> 32) | (product[7] << 32);
+       tmp[1] = (product[7] >> 32) | (product[4] << 32);
+       tmp[2] = (product[4] >> 32) | (product[5] << 32);
+       tmp[3] = (product[6] << 32);
+       carry -= vli_sub(result, result, tmp, ndigits);
+
+       /* d4 */
+       tmp[0] = product[7];
+       tmp[1] = product[4] & 0xffffffff00000000ull;
+       tmp[2] = product[5];
+       tmp[3] = product[6] & 0xffffffff00000000ull;
+       carry -= vli_sub(result, result, tmp, ndigits);
+
+       if (carry < 0) {
+               do {
+                       carry += vli_add(result, result, curve_prime, ndigits);
+               } while (carry < 0);
+       } else {
+               while (carry || vli_cmp(curve_prime, result, ndigits) != 1)
+                       carry -= vli_sub(result, result, curve_prime, ndigits);
+       }
+}
+
+/* Computes result = product % curve_prime
+ *  from http://www.nsa.gov/ia/_files/nist-routines.pdf
+*/
+static bool vli_mmod_fast(u64 *result, u64 *product,
+                         const u64 *curve_prime, unsigned int ndigits)
+{
+       u64 tmp[2 * ndigits];
+
+       switch (ndigits) {
+       case 3:
+               vli_mmod_fast_192(result, product, curve_prime, tmp);
+               break;
+       case 4:
+               vli_mmod_fast_256(result, product, curve_prime, tmp);
+               break;
+       default:
+               pr_err("unsupports digits size!\n");
+               return false;
+       }
+
+       return true;
+}
+
+/* Computes result = (left * right) % curve_prime. */
+static void vli_mod_mult_fast(u64 *result, const u64 *left, const u64 *right,
+                             const u64 *curve_prime, unsigned int ndigits)
+{
+       u64 product[2 * ndigits];
+
+       vli_mult(product, left, right, ndigits);
+       vli_mmod_fast(result, product, curve_prime, ndigits);
+}
+
+/* Computes result = left^2 % curve_prime. */
+static void vli_mod_square_fast(u64 *result, const u64 *left,
+                               const u64 *curve_prime, unsigned int ndigits)
+{
+       u64 product[2 * ndigits];
+
+       vli_square(product, left, ndigits);
+       vli_mmod_fast(result, product, curve_prime, ndigits);
+}
+
+#define EVEN(vli) (!(vli[0] & 1))
+/* Computes result = (1 / p_input) % mod. All VLIs are the same size.
+ * See "From Euclid's GCD to Montgomery Multiplication to the Great Divide"
+ * https://labs.oracle.com/techrep/2001/smli_tr-2001-95.pdf
+ */
+static void vli_mod_inv(u64 *result, const u64 *input, const u64 *mod,
+                       unsigned int ndigits)
+{
+       u64 a[ndigits], b[ndigits];
+       u64 u[ndigits], v[ndigits];
+       u64 carry;
+       int cmp_result;
+
+       if (vli_is_zero(input, ndigits)) {
+               vli_clear(result, ndigits);
+               return;
+       }
+
+       vli_set(a, input, ndigits);
+       vli_set(b, mod, ndigits);
+       vli_clear(u, ndigits);
+       u[0] = 1;
+       vli_clear(v, ndigits);
+
+       while ((cmp_result = vli_cmp(a, b, ndigits)) != 0) {
+               carry = 0;
+
+               if (EVEN(a)) {
+                       vli_rshift1(a, ndigits);
+
+                       if (!EVEN(u))
+                               carry = vli_add(u, u, mod, ndigits);
+
+                       vli_rshift1(u, ndigits);
+                       if (carry)
+                               u[ndigits - 1] |= 0x8000000000000000ull;
+               } else if (EVEN(b)) {
+                       vli_rshift1(b, ndigits);
+
+                       if (!EVEN(v))
+                               carry = vli_add(v, v, mod, ndigits);
+
+                       vli_rshift1(v, ndigits);
+                       if (carry)
+                               v[ndigits - 1] |= 0x8000000000000000ull;
+               } else if (cmp_result > 0) {
+                       vli_sub(a, a, b, ndigits);
+                       vli_rshift1(a, ndigits);
+
+                       if (vli_cmp(u, v, ndigits) < 0)
+                               vli_add(u, u, mod, ndigits);
+
+                       vli_sub(u, u, v, ndigits);
+                       if (!EVEN(u))
+                               carry = vli_add(u, u, mod, ndigits);
+
+                       vli_rshift1(u, ndigits);
+                       if (carry)
+                               u[ndigits - 1] |= 0x8000000000000000ull;
+               } else {
+                       vli_sub(b, b, a, ndigits);
+                       vli_rshift1(b, ndigits);
+
+                       if (vli_cmp(v, u, ndigits) < 0)
+                               vli_add(v, v, mod, ndigits);
+
+                       vli_sub(v, v, u, ndigits);
+                       if (!EVEN(v))
+                               carry = vli_add(v, v, mod, ndigits);
+
+                       vli_rshift1(v, ndigits);
+                       if (carry)
+                               v[ndigits - 1] |= 0x8000000000000000ull;
+               }
+       }
+
+       vli_set(result, u, ndigits);
+}
+
+/* ------ Point operations ------ */
+
+/* Returns true if p_point is the point at infinity, false otherwise. */
+static bool ecc_point_is_zero(const struct ecc_point *point)
+{
+       return (vli_is_zero(point->x, point->ndigits) &&
+               vli_is_zero(point->y, point->ndigits));
+}
+
+/* Point multiplication algorithm using Montgomery's ladder with co-Z
+ * coordinates. From http://eprint.iacr.org/2011/338.pdf
+ */
+
+/* Double in place */
+static void ecc_point_double_jacobian(u64 *x1, u64 *y1, u64 *z1,
+                                     u64 *curve_prime, unsigned int ndigits)
+{
+       /* t1 = x, t2 = y, t3 = z */
+       u64 t4[ndigits];
+       u64 t5[ndigits];
+
+       if (vli_is_zero(z1, ndigits))
+               return;
+
+       /* t4 = y1^2 */
+       vli_mod_square_fast(t4, y1, curve_prime, ndigits);
+       /* t5 = x1*y1^2 = A */
+       vli_mod_mult_fast(t5, x1, t4, curve_prime, ndigits);
+       /* t4 = y1^4 */
+       vli_mod_square_fast(t4, t4, curve_prime, ndigits);
+       /* t2 = y1*z1 = z3 */
+       vli_mod_mult_fast(y1, y1, z1, curve_prime, ndigits);
+       /* t3 = z1^2 */
+       vli_mod_square_fast(z1, z1, curve_prime, ndigits);
+
+       /* t1 = x1 + z1^2 */
+       vli_mod_add(x1, x1, z1, curve_prime, ndigits);
+       /* t3 = 2*z1^2 */
+       vli_mod_add(z1, z1, z1, curve_prime, ndigits);
+       /* t3 = x1 - z1^2 */
+       vli_mod_sub(z1, x1, z1, curve_prime, ndigits);
+       /* t1 = x1^2 - z1^4 */
+       vli_mod_mult_fast(x1, x1, z1, curve_prime, ndigits);
+
+       /* t3 = 2*(x1^2 - z1^4) */
+       vli_mod_add(z1, x1, x1, curve_prime, ndigits);
+       /* t1 = 3*(x1^2 - z1^4) */
+       vli_mod_add(x1, x1, z1, curve_prime, ndigits);
+       if (vli_test_bit(x1, 0)) {
+               u64 carry = vli_add(x1, x1, curve_prime, ndigits);
+
+               vli_rshift1(x1, ndigits);
+               x1[ndigits - 1] |= carry << 63;
+       } else {
+               vli_rshift1(x1, ndigits);
+       }
+       /* t1 = 3/2*(x1^2 - z1^4) = B */
+
+       /* t3 = B^2 */
+       vli_mod_square_fast(z1, x1, curve_prime, ndigits);
+       /* t3 = B^2 - A */
+       vli_mod_sub(z1, z1, t5, curve_prime, ndigits);
+       /* t3 = B^2 - 2A = x3 */
+       vli_mod_sub(z1, z1, t5, curve_prime, ndigits);
+       /* t5 = A - x3 */
+       vli_mod_sub(t5, t5, z1, curve_prime, ndigits);
+       /* t1 = B * (A - x3) */
+       vli_mod_mult_fast(x1, x1, t5, curve_prime, ndigits);
+       /* t4 = B * (A - x3) - y1^4 = y3 */
+       vli_mod_sub(t4, x1, t4, curve_prime, ndigits);
+
+       vli_set(x1, z1, ndigits);
+       vli_set(z1, y1, ndigits);
+       vli_set(y1, t4, ndigits);
+}
+
+/* Modify (x1, y1) => (x1 * z^2, y1 * z^3) */
+static void apply_z(u64 *x1, u64 *y1, u64 *z, u64 *curve_prime,
+                   unsigned int ndigits)
+{
+       u64 t1[ndigits];
+
+       vli_mod_square_fast(t1, z, curve_prime, ndigits);    /* z^2 */
+       vli_mod_mult_fast(x1, x1, t1, curve_prime, ndigits); /* x1 * z^2 */
+       vli_mod_mult_fast(t1, t1, z, curve_prime, ndigits);  /* z^3 */
+       vli_mod_mult_fast(y1, y1, t1, curve_prime, ndigits); /* y1 * z^3 */
+}
+
+/* P = (x1, y1) => 2P, (x2, y2) => P' */
+static void xycz_initial_double(u64 *x1, u64 *y1, u64 *x2, u64 *y2,
+                               u64 *p_initial_z, u64 *curve_prime,
+                               unsigned int ndigits)
+{
+       u64 z[ndigits];
+
+       vli_set(x2, x1, ndigits);
+       vli_set(y2, y1, ndigits);
+
+       vli_clear(z, ndigits);
+       z[0] = 1;
+
+       if (p_initial_z)
+               vli_set(z, p_initial_z, ndigits);
+
+       apply_z(x1, y1, z, curve_prime, ndigits);
+
+       ecc_point_double_jacobian(x1, y1, z, curve_prime, ndigits);
+
+       apply_z(x2, y2, z, curve_prime, ndigits);
+}
+
+/* Input P = (x1, y1, Z), Q = (x2, y2, Z)
+ * Output P' = (x1', y1', Z3), P + Q = (x3, y3, Z3)
+ * or P => P', Q => P + Q
+ */
+static void xycz_add(u64 *x1, u64 *y1, u64 *x2, u64 *y2, u64 *curve_prime,
+                    unsigned int ndigits)
+{
+       /* t1 = X1, t2 = Y1, t3 = X2, t4 = Y2 */
+       u64 t5[ndigits];
+
+       /* t5 = x2 - x1 */
+       vli_mod_sub(t5, x2, x1, curve_prime, ndigits);
+       /* t5 = (x2 - x1)^2 = A */
+       vli_mod_square_fast(t5, t5, curve_prime, ndigits);
+       /* t1 = x1*A = B */
+       vli_mod_mult_fast(x1, x1, t5, curve_prime, ndigits);
+       /* t3 = x2*A = C */
+       vli_mod_mult_fast(x2, x2, t5, curve_prime, ndigits);
+       /* t4 = y2 - y1 */
+       vli_mod_sub(y2, y2, y1, curve_prime, ndigits);
+       /* t5 = (y2 - y1)^2 = D */
+       vli_mod_square_fast(t5, y2, curve_prime, ndigits);
+
+       /* t5 = D - B */
+       vli_mod_sub(t5, t5, x1, curve_prime, ndigits);
+       /* t5 = D - B - C = x3 */
+       vli_mod_sub(t5, t5, x2, curve_prime, ndigits);
+       /* t3 = C - B */
+       vli_mod_sub(x2, x2, x1, curve_prime, ndigits);
+       /* t2 = y1*(C - B) */
+       vli_mod_mult_fast(y1, y1, x2, curve_prime, ndigits);
+       /* t3 = B - x3 */
+       vli_mod_sub(x2, x1, t5, curve_prime, ndigits);
+       /* t4 = (y2 - y1)*(B - x3) */
+       vli_mod_mult_fast(y2, y2, x2, curve_prime, ndigits);
+       /* t4 = y3 */
+       vli_mod_sub(y2, y2, y1, curve_prime, ndigits);
+
+       vli_set(x2, t5, ndigits);
+}
+
+/* Input P = (x1, y1, Z), Q = (x2, y2, Z)
+ * Output P + Q = (x3, y3, Z3), P - Q = (x3', y3', Z3)
+ * or P => P - Q, Q => P + Q
+ */
+static void xycz_add_c(u64 *x1, u64 *y1, u64 *x2, u64 *y2, u64 *curve_prime,
+                      unsigned int ndigits)
+{
+       /* t1 = X1, t2 = Y1, t3 = X2, t4 = Y2 */
+       u64 t5[ndigits];
+       u64 t6[ndigits];
+       u64 t7[ndigits];
+
+       /* t5 = x2 - x1 */
+       vli_mod_sub(t5, x2, x1, curve_prime, ndigits);
+       /* t5 = (x2 - x1)^2 = A */
+       vli_mod_square_fast(t5, t5, curve_prime, ndigits);
+       /* t1 = x1*A = B */
+       vli_mod_mult_fast(x1, x1, t5, curve_prime, ndigits);
+       /* t3 = x2*A = C */
+       vli_mod_mult_fast(x2, x2, t5, curve_prime, ndigits);
+       /* t4 = y2 + y1 */
+       vli_mod_add(t5, y2, y1, curve_prime, ndigits);
+       /* t4 = y2 - y1 */
+       vli_mod_sub(y2, y2, y1, curve_prime, ndigits);
+
+       /* t6 = C - B */
+       vli_mod_sub(t6, x2, x1, curve_prime, ndigits);
+       /* t2 = y1 * (C - B) */
+       vli_mod_mult_fast(y1, y1, t6, curve_prime, ndigits);
+       /* t6 = B + C */
+       vli_mod_add(t6, x1, x2, curve_prime, ndigits);
+       /* t3 = (y2 - y1)^2 */
+       vli_mod_square_fast(x2, y2, curve_prime, ndigits);
+       /* t3 = x3 */
+       vli_mod_sub(x2, x2, t6, curve_prime, ndigits);
+
+       /* t7 = B - x3 */
+       vli_mod_sub(t7, x1, x2, curve_prime, ndigits);
+       /* t4 = (y2 - y1)*(B - x3) */
+       vli_mod_mult_fast(y2, y2, t7, curve_prime, ndigits);
+       /* t4 = y3 */
+       vli_mod_sub(y2, y2, y1, curve_prime, ndigits);
+
+       /* t7 = (y2 + y1)^2 = F */
+       vli_mod_square_fast(t7, t5, curve_prime, ndigits);
+       /* t7 = x3' */
+       vli_mod_sub(t7, t7, t6, curve_prime, ndigits);
+       /* t6 = x3' - B */
+       vli_mod_sub(t6, t7, x1, curve_prime, ndigits);
+       /* t6 = (y2 + y1)*(x3' - B) */
+       vli_mod_mult_fast(t6, t6, t5, curve_prime, ndigits);
+       /* t2 = y3' */
+       vli_mod_sub(y1, t6, y1, curve_prime, ndigits);
+
+       vli_set(x1, t7, ndigits);
+}
+
+static void ecc_point_mult(struct ecc_point *result,
+                          const struct ecc_point *point, const u64 *scalar,
+                          u64 *initial_z, u64 *curve_prime,
+                          unsigned int ndigits)
+{
+       /* R0 and R1 */
+       u64 rx[2][ndigits];
+       u64 ry[2][ndigits];
+       u64 z[ndigits];
+       int i, nb;
+       int num_bits = vli_num_bits(scalar, ndigits);
+
+       vli_set(rx[1], point->x, ndigits);
+       vli_set(ry[1], point->y, ndigits);
+
+       xycz_initial_double(rx[1], ry[1], rx[0], ry[0], initial_z, curve_prime,
+                           ndigits);
+
+       for (i = num_bits - 2; i > 0; i--) {
+               nb = !vli_test_bit(scalar, i);
+               xycz_add_c(rx[1 - nb], ry[1 - nb], rx[nb], ry[nb], curve_prime,
+                          ndigits);
+               xycz_add(rx[nb], ry[nb], rx[1 - nb], ry[1 - nb], curve_prime,
+                        ndigits);
+       }
+
+       nb = !vli_test_bit(scalar, 0);
+       xycz_add_c(rx[1 - nb], ry[1 - nb], rx[nb], ry[nb], curve_prime,
+                  ndigits);
+
+       /* Find final 1/Z value. */
+       /* X1 - X0 */
+       vli_mod_sub(z, rx[1], rx[0], curve_prime, ndigits);
+       /* Yb * (X1 - X0) */
+       vli_mod_mult_fast(z, z, ry[1 - nb], curve_prime, ndigits);
+       /* xP * Yb * (X1 - X0) */
+       vli_mod_mult_fast(z, z, point->x, curve_prime, ndigits);
+
+       /* 1 / (xP * Yb * (X1 - X0)) */
+       vli_mod_inv(z, z, curve_prime, point->ndigits);
+
+       /* yP / (xP * Yb * (X1 - X0)) */
+       vli_mod_mult_fast(z, z, point->y, curve_prime, ndigits);
+       /* Xb * yP / (xP * Yb * (X1 - X0)) */
+       vli_mod_mult_fast(z, z, rx[1 - nb], curve_prime, ndigits);
+       /* End 1/Z calculation */
+
+       xycz_add(rx[nb], ry[nb], rx[1 - nb], ry[1 - nb], curve_prime, ndigits);
+
+       apply_z(rx[0], ry[0], z, curve_prime, ndigits);
+
+       vli_set(result->x, rx[0], ndigits);
+       vli_set(result->y, ry[0], ndigits);
+}
+
+static inline void ecc_swap_digits(const u64 *in, u64 *out,
+                                  unsigned int ndigits)
+{
+       int i;
+
+       for (i = 0; i < ndigits; i++)
+               out[i] = __swab64(in[ndigits - 1 - i]);
+}
+
+int ecc_is_key_valid(unsigned int curve_id, unsigned int ndigits,
+                    const u8 *private_key, unsigned int private_key_len)
+{
+       int nbytes;
+       const struct ecc_curve *curve = ecc_get_curve(curve_id);
+
+       if (!private_key)
+               return -EINVAL;
+
+       nbytes = ndigits << ECC_DIGITS_TO_BYTES_SHIFT;
+
+       if (private_key_len != nbytes)
+               return -EINVAL;
+
+       if (vli_is_zero((const u64 *)&private_key[0], ndigits))
+               return -EINVAL;
+
+       /* Make sure the private key is in the range [1, n-1]. */
+       if (vli_cmp(curve->n, (const u64 *)&private_key[0], ndigits) != 1)
+               return -EINVAL;
+
+       return 0;
+}
+
+int ecdh_make_pub_key(unsigned int curve_id, unsigned int ndigits,
+                     const u8 *private_key, unsigned int private_key_len,
+                     u8 *public_key, unsigned int public_key_len)
+{
+       int ret = 0;
+       struct ecc_point *pk;
+       u64 priv[ndigits];
+       unsigned int nbytes;
+       const struct ecc_curve *curve = ecc_get_curve(curve_id);
+
+       if (!private_key || !curve) {
+               ret = -EINVAL;
+               goto out;
+       }
+
+       ecc_swap_digits((const u64 *)private_key, priv, ndigits);
+
+       pk = ecc_alloc_point(ndigits);
+       if (!pk) {
+               ret = -ENOMEM;
+               goto out;
+       }
+
+       ecc_point_mult(pk, &curve->g, priv, NULL, curve->p, ndigits);
+       if (ecc_point_is_zero(pk)) {
+               ret = -EAGAIN;
+               goto err_free_point;
+       }
+
+       nbytes = ndigits << ECC_DIGITS_TO_BYTES_SHIFT;
+       ecc_swap_digits(pk->x, (u64 *)public_key, ndigits);
+       ecc_swap_digits(pk->y, (u64 *)&public_key[nbytes], ndigits);
+
+err_free_point:
+       ecc_free_point(pk);
+out:
+       return ret;
+}
+
+int ecdh_shared_secret(unsigned int curve_id, unsigned int ndigits,
+                      const u8 *private_key, unsigned int private_key_len,
+                      const u8 *public_key, unsigned int public_key_len,
+                      u8 *secret, unsigned int secret_len)
+{
+       int ret = 0;
+       struct ecc_point *product, *pk;
+       u64 priv[ndigits];
+       u64 rand_z[ndigits];
+       unsigned int nbytes;
+       const struct ecc_curve *curve = ecc_get_curve(curve_id);
+
+       if (!private_key || !public_key || !curve) {
+               ret = -EINVAL;
+               goto out;
+       }
+
+       nbytes = ndigits << ECC_DIGITS_TO_BYTES_SHIFT;
+
+       get_random_bytes(rand_z, nbytes);
+
+       pk = ecc_alloc_point(ndigits);
+       if (!pk) {
+               ret = -ENOMEM;
+               goto out;
+       }
+
+       product = ecc_alloc_point(ndigits);
+       if (!product) {
+               ret = -ENOMEM;
+               goto err_alloc_product;
+       }
+
+       ecc_swap_digits((const u64 *)public_key, pk->x, ndigits);
+       ecc_swap_digits((const u64 *)&public_key[nbytes], pk->y, ndigits);
+       ecc_swap_digits((const u64 *)private_key, priv, ndigits);
+
+       ecc_point_mult(product, pk, priv, rand_z, curve->p, ndigits);
+
+       ecc_swap_digits(product->x, (u64 *)secret, ndigits);
+
+       if (ecc_point_is_zero(product))
+               ret = -EFAULT;
+
+       ecc_free_point(product);
+err_alloc_product:
+       ecc_free_point(pk);
+out:
+       return ret;
+}

diff --git a/crypto/ecc.h b/crypto/ecc.h
new file mode 100644 (file)
index 0000000..b5db4b9
--- /dev/null
+++ b/crypto/ecc.h
@@ -0,0 +1,83 @@
+/*
+ * Copyright (c) 2013, Kenneth MacKay
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *  * Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#ifndef _CRYPTO_ECC_H
+#define _CRYPTO_ECC_H
+
+#define ECC_MAX_DIGITS 4 /* 256 */
+
+#define ECC_DIGITS_TO_BYTES_SHIFT 3
+
+/**
+ * ecc_is_key_valid() - Validate a given ECDH private key
+ *
+ * @curve_id:          id representing the curve to use
+ * @ndigits:           curve number of digits
+ * @private_key:       private key to be used for the given curve
+ * @private_key_len:   private key len
+ *
+ * Returns 0 if the key is acceptable, a negative value otherwise
+ */
+int ecc_is_key_valid(unsigned int curve_id, unsigned int ndigits,
+                    const u8 *private_key, unsigned int private_key_len);
+
+/**
+ * ecdh_make_pub_key() - Compute an ECC public key
+ *
+ * @curve_id:          id representing the curve to use
+ * @private_key:       pregenerated private key for the given curve
+ * @private_key_len:   length of private_key
+ * @public_key:                buffer for storing the public key generated
+ * @public_key_len:    length of the public_key buffer
+ *
+ * Returns 0 if the public key was generated successfully, a negative value
+ * if an error occurred.
+ */
+int ecdh_make_pub_key(const unsigned int curve_id, unsigned int ndigits,
+                     const u8 *private_key, unsigned int private_key_len,
+                     u8 *public_key, unsigned int public_key_len);
+
+/**
+ * ecdh_shared_secret() - Compute a shared secret
+ *
+ * @curve_id:          id representing the curve to use
+ * @private_key:       private key of part A
+ * @private_key_len:   length of private_key
+ * @public_key:                public key of counterpart B
+ * @public_key_len:    length of public_key
+ * @secret:            buffer for storing the calculated shared secret
+ * @secret_len:                length of the secret buffer
+ *
+ * Note: It is recommended that you hash the result of ecdh_shared_secret
+ * before using it for symmetric encryption or HMAC.
+ *
+ * Returns 0 if the shared secret was generated successfully, a negative value
+ * if an error occurred.
+ */
+int ecdh_shared_secret(unsigned int curve_id, unsigned int ndigits,
+                      const u8 *private_key, unsigned int private_key_len,
+                      const u8 *public_key, unsigned int public_key_len,
+                      u8 *secret, unsigned int secret_len);
+#endif

diff --git a/crypto/ecc_curve_defs.h b/crypto/ecc_curve_defs.h
new file mode 100644 (file)
index 0000000..03ae5f7
--- /dev/null
+++ b/crypto/ecc_curve_defs.h
@@ -0,0 +1,57 @@
+#ifndef _CRYTO_ECC_CURVE_DEFS_H
+#define _CRYTO_ECC_CURVE_DEFS_H
+
+struct ecc_point {
+       u64 *x;
+       u64 *y;
+       u8 ndigits;
+};
+
+struct ecc_curve {
+       char *name;
+       struct ecc_point g;
+       u64 *p;
+       u64 *n;
+};
+
+/* NIST P-192 */
+static u64 nist_p192_g_x[] = { 0xF4FF0AFD82FF1012ull, 0x7CBF20EB43A18800ull,
+                               0x188DA80EB03090F6ull };
+static u64 nist_p192_g_y[] = { 0x73F977A11E794811ull, 0x631011ED6B24CDD5ull,
+                               0x07192B95FFC8DA78ull };
+static u64 nist_p192_p[] = { 0xFFFFFFFFFFFFFFFFull, 0xFFFFFFFFFFFFFFFEull,
+                               0xFFFFFFFFFFFFFFFFull };
+static u64 nist_p192_n[] = { 0x146BC9B1B4D22831ull, 0xFFFFFFFF99DEF836ull,
+                               0xFFFFFFFFFFFFFFFFull };
+static struct ecc_curve nist_p192 = {
+       .name = "nist_192",
+       .g = {
+               .x = nist_p192_g_x,
+               .y = nist_p192_g_y,
+               .ndigits = 3,
+       },
+       .p = nist_p192_p,
+       .n = nist_p192_n
+};
+
+/* NIST P-256 */
+static u64 nist_p256_g_x[] = { 0xF4A13945D898C296ull, 0x77037D812DEB33A0ull,
+                               0xF8BCE6E563A440F2ull, 0x6B17D1F2E12C4247ull };
+static u64 nist_p256_g_y[] = { 0xCBB6406837BF51F5ull, 0x2BCE33576B315ECEull,
+                               0x8EE7EB4A7C0F9E16ull, 0x4FE342E2FE1A7F9Bull };
+static u64 nist_p256_p[] = { 0xFFFFFFFFFFFFFFFFull, 0x00000000FFFFFFFFull,
+                               0x0000000000000000ull, 0xFFFFFFFF00000001ull };
+static u64 nist_p256_n[] = { 0xF3B9CAC2FC632551ull, 0xBCE6FAADA7179E84ull,
+                               0xFFFFFFFFFFFFFFFFull, 0xFFFFFFFF00000000ull };
+static struct ecc_curve nist_p256 = {
+       .name = "nist_256",
+       .g = {
+               .x = nist_p256_g_x,
+               .y = nist_p256_g_y,
+               .ndigits = 4,
+       },
+       .p = nist_p256_p,
+       .n = nist_p256_n
+};
+
+#endif

diff --git a/crypto/ecdh.c b/crypto/ecdh.c
new file mode 100644 (file)
index 0000000..d3a9eec
--- /dev/null
+++ b/crypto/ecdh.c
@@ -0,0 +1,151 @@
+/* ECDH key-agreement protocol
+ *
+ * Copyright (c) 2016, Intel Corporation
+ * Authors: Salvator Benedetto <salvatore.benedetto@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <crypto/internal/kpp.h>
+#include <crypto/kpp.h>
+#include <crypto/ecdh.h>
+#include <linux/scatterlist.h>
+#include "ecc.h"
+
+struct ecdh_ctx {
+       unsigned int curve_id;
+       unsigned int ndigits;
+       u64 private_key[ECC_MAX_DIGITS];
+       u64 public_key[2 * ECC_MAX_DIGITS];
+       u64 shared_secret[ECC_MAX_DIGITS];
+};
+
+static inline struct ecdh_ctx *ecdh_get_ctx(struct crypto_kpp *tfm)
+{
+       return kpp_tfm_ctx(tfm);
+}
+
+static unsigned int ecdh_supported_curve(unsigned int curve_id)
+{
+       switch (curve_id) {
+       case ECC_CURVE_NIST_P192: return 3;
+       case ECC_CURVE_NIST_P256: return 4;
+       default: return 0;
+       }
+}
+
+static int ecdh_set_secret(struct crypto_kpp *tfm, void *buf, unsigned int len)
+{
+       struct ecdh_ctx *ctx = ecdh_get_ctx(tfm);
+       struct ecdh params;
+       unsigned int ndigits;
+
+       if (crypto_ecdh_decode_key(buf, len, &params) < 0)
+               return -EINVAL;
+
+       ndigits = ecdh_supported_curve(params.curve_id);
+       if (!ndigits)
+               return -EINVAL;
+
+       ctx->curve_id = params.curve_id;
+       ctx->ndigits = ndigits;
+
+       if (ecc_is_key_valid(ctx->curve_id, ctx->ndigits,
+                            (const u8 *)params.key, params.key_size) < 0)
+               return -EINVAL;
+
+       memcpy(ctx->private_key, params.key, params.key_size);
+
+       return 0;
+}
+
+static int ecdh_compute_value(struct kpp_request *req)
+{
+       int ret = 0;
+       struct crypto_kpp *tfm = crypto_kpp_reqtfm(req);
+       struct ecdh_ctx *ctx = ecdh_get_ctx(tfm);
+       size_t copied, nbytes;
+       void *buf;
+
+       nbytes = ctx->ndigits << ECC_DIGITS_TO_BYTES_SHIFT;
+
+       if (req->src) {
+               copied = sg_copy_to_buffer(req->src, 1, ctx->public_key,
+                                          2 * nbytes);
+               if (copied != 2 * nbytes)
+                       return -EINVAL;
+
+               ret = ecdh_shared_secret(ctx->curve_id, ctx->ndigits,
+                                        (const u8 *)ctx->private_key, nbytes,
+                                        (const u8 *)ctx->public_key, 2 * nbytes,
+                                        (u8 *)ctx->shared_secret, nbytes);
+
+               buf = ctx->shared_secret;
+       } else {
+               ret = ecdh_make_pub_key(ctx->curve_id, ctx->ndigits,
+                                       (const u8 *)ctx->private_key, nbytes,
+                                       (u8 *)ctx->public_key,
+                                       sizeof(ctx->public_key));
+               buf = ctx->public_key;
+               /* Public part is a point thus it has both coordinates */
+               nbytes *= 2;
+       }
+
+       if (ret < 0)
+               return ret;
+
+       copied = sg_copy_from_buffer(req->dst, 1, buf, nbytes);
+       if (copied != nbytes)
+               return -EINVAL;
+
+       return ret;
+}
+
+static int ecdh_max_size(struct crypto_kpp *tfm)
+{
+       struct ecdh_ctx *ctx = ecdh_get_ctx(tfm);
+       int nbytes = ctx->ndigits << ECC_DIGITS_TO_BYTES_SHIFT;
+
+       /* Public key is made of two coordinates */
+       return 2 * nbytes;
+}
+
+static void no_exit_tfm(struct crypto_kpp *tfm)
+{
+       return;
+}
+
+static struct kpp_alg ecdh = {
+       .set_secret = ecdh_set_secret,
+       .generate_public_key = ecdh_compute_value,
+       .compute_shared_secret = ecdh_compute_value,
+       .max_size = ecdh_max_size,
+       .exit = no_exit_tfm,
+       .base = {
+               .cra_name = "ecdh",
+               .cra_driver_name = "ecdh-generic",
+               .cra_priority = 100,
+               .cra_module = THIS_MODULE,
+               .cra_ctxsize = sizeof(struct ecdh_ctx),
+       },
+};
+
+static int ecdh_init(void)
+{
+       return crypto_register_kpp(&ecdh);
+}
+
+static void ecdh_exit(void)
+{
+       crypto_unregister_kpp(&ecdh);
+}
+
+module_init(ecdh_init);
+module_exit(ecdh_exit);
+MODULE_ALIAS_CRYPTO("ecdh");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("ECDH generic algorithm");

diff --git a/crypto/ecdh_helper.c b/crypto/ecdh_helper.c
new file mode 100644 (file)
index 0000000..3cd8a24
--- /dev/null
+++ b/crypto/ecdh_helper.c
@@ -0,0 +1,86 @@
+/*
+ * Copyright (c) 2016, Intel Corporation
+ * Authors: Salvatore Benedetto <salvatore.benedetto@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+#include <linux/kernel.h>
+#include <linux/export.h>
+#include <linux/err.h>
+#include <linux/string.h>
+#include <crypto/ecdh.h>
+#include <crypto/kpp.h>
+
+#define ECDH_KPP_SECRET_MIN_SIZE (sizeof(struct kpp_secret) + 2 * sizeof(short))
+
+static inline u8 *ecdh_pack_data(void *dst, const void *src, size_t sz)
+{
+       memcpy(dst, src, sz);
+       return dst + sz;
+}
+
+static inline const u8 *ecdh_unpack_data(void *dst, const void *src, size_t sz)
+{
+       memcpy(dst, src, sz);
+       return src + sz;
+}
+
+int crypto_ecdh_key_len(const struct ecdh *params)
+{
+       return ECDH_KPP_SECRET_MIN_SIZE + params->key_size;
+}
+EXPORT_SYMBOL_GPL(crypto_ecdh_key_len);
+
+int crypto_ecdh_encode_key(char *buf, unsigned int len,
+                          const struct ecdh *params)
+{
+       u8 *ptr = buf;
+       struct kpp_secret secret = {
+               .type = CRYPTO_KPP_SECRET_TYPE_ECDH,
+               .len = len
+       };
+
+       if (unlikely(!buf))
+               return -EINVAL;
+
+       if (len != crypto_ecdh_key_len(params))
+               return -EINVAL;
+
+       ptr = ecdh_pack_data(ptr, &secret, sizeof(secret));
+       ptr = ecdh_pack_data(ptr, &params->curve_id, sizeof(params->curve_id));
+       ptr = ecdh_pack_data(ptr, &params->key_size, sizeof(params->key_size));
+       ecdh_pack_data(ptr, params->key, params->key_size);
+
+       return 0;
+}
+EXPORT_SYMBOL_GPL(crypto_ecdh_encode_key);
+
+int crypto_ecdh_decode_key(const char *buf, unsigned int len,
+                          struct ecdh *params)
+{
+       const u8 *ptr = buf;
+       struct kpp_secret secret;
+
+       if (unlikely(!buf || len < ECDH_KPP_SECRET_MIN_SIZE))
+               return -EINVAL;
+
+       ptr = ecdh_unpack_data(&secret, ptr, sizeof(secret));
+       if (secret.type != CRYPTO_KPP_SECRET_TYPE_ECDH)
+               return -EINVAL;
+
+       ptr = ecdh_unpack_data(&params->curve_id, ptr, sizeof(params->curve_id));
+       ptr = ecdh_unpack_data(&params->key_size, ptr, sizeof(params->key_size));
+       if (secret.len != crypto_ecdh_key_len(params))
+               return -EINVAL;
+
+       /* Don't allocate memory. Set pointer to data
+        * within the given buffer
+        */
+       params->key = (void *)ptr;
+
+       return 0;
+}
+EXPORT_SYMBOL_GPL(crypto_ecdh_decode_key);

diff --git a/crypto/testmgr.c b/crypto/testmgr.c
index ff79eb887fd0b49f8e1270886b8ba08be46ac48b..537fdc380a7b8270e6b0c0310204b04463557db4 100644 (file)
--- a/crypto/testmgr.c
+++ b/crypto/testmgr.c
@@ -3300,6 +3300,16 @@ static const struct alg_test_desc alg_test_descs[] = {
                                }
                        }
                }
+       }, {
+               .alg = "ecdh",
+               .test = alg_test_kpp,
+               .fips_allowed = 1,
+               .suite = {
+                       .kpp = {
+                               .vecs = ecdh_tv_template,
+                               .count = ECDH_TEST_VECTORS
+                       }
+               }
        }, {
                .alg = "gcm(aes)",
                .test = alg_test_aead,

diff --git a/crypto/testmgr.h b/crypto/testmgr.h
index 78e874eca031dbf18ad3b1decf7342300df6f521..7358931b3082cd70878046b37b15032c0a27bc26 100644 (file)
--- a/crypto/testmgr.h
+++ b/crypto/testmgr.h
@@ -560,6 +560,99 @@ struct kpp_testvec dh_tv_template[] = {
        }
 };
 
+#ifdef CONFIG_CRYPTO_FIPS
+#define ECDH_TEST_VECTORS 1
+#else
+#define ECDH_TEST_VECTORS 2
+#endif
+struct kpp_testvec ecdh_tv_template[] = {
+       {
+#ifndef CONFIG_CRYPTO_FIPS
+       .secret =
+#ifdef __LITTLE_ENDIAN
+       "\x02\x00" /* type */
+       "\x20\x00" /* len */
+       "\x01\x00" /* curve_id */
+       "\x18\x00" /* key_size */
+#else
+       "\x00\x02" /* type */
+       "\x00\x20" /* len */
+       "\x00\x01" /* curve_id */
+       "\x00\x18" /* key_size */
+#endif
+       "\xb5\x05\xb1\x71\x1e\xbf\x8c\xda"
+       "\x4e\x19\x1e\x62\x1f\x23\x23\x31"
+       "\x36\x1e\xd3\x84\x2f\xcc\x21\x72",
+       .b_public =
+       "\xc3\xba\x67\x4b\x71\xec\xd0\x76"
+       "\x7a\x99\x75\x64\x36\x13\x9a\x94"
+       "\x5d\x8b\xdc\x60\x90\x91\xfd\x3f"
+       "\xb0\x1f\x8a\x0a\x68\xc6\x88\x6e"
+       "\x83\x87\xdd\x67\x09\xf8\x8d\x96"
+       "\x07\xd6\xbd\x1c\xe6\x8d\x9d\x67",
+       .expected_a_public =
+       "\x1a\x04\xdb\xa5\xe1\xdd\x4e\x79"
+       "\xa3\xe6\xef\x0e\x5c\x80\x49\x85"
+       "\xfa\x78\xb4\xef\x49\xbd\x4c\x7c"
+       "\x22\x90\x21\x02\xf9\x1b\x81\x5d"
+       "\x0c\x8a\xa8\x98\xd6\x27\x69\x88"
+       "\x5e\xbc\x94\xd8\x15\x9e\x21\xce",
+       .expected_ss =
+       "\xf4\x57\xcc\x4f\x1f\x4e\x31\xcc"
+       "\xe3\x40\x60\xc8\x06\x93\xc6\x2e"
+       "\x99\x80\x81\x28\xaf\xc5\x51\x74",
+       .secret_size = 32,
+       .b_public_size = 48,
+       .expected_a_public_size = 48,
+       .expected_ss_size = 24
+       }, {
+#endif
+       .secret =
+#ifdef __LITTLE_ENDIAN
+       "\x02\x00" /* type */
+       "\x28\x00" /* len */
+       "\x02\x00" /* curve_id */
+       "\x20\x00" /* key_size */
+#else
+       "\x00\x02" /* type */
+       "\x00\x28" /* len */
+       "\x00\x02" /* curve_id */
+       "\x00\x20" /* key_size */
+#endif
+       "\x24\xd1\x21\xeb\xe5\xcf\x2d\x83"
+       "\xf6\x62\x1b\x6e\x43\x84\x3a\xa3"
+       "\x8b\xe0\x86\xc3\x20\x19\xda\x92"
+       "\x50\x53\x03\xe1\xc0\xea\xb8\x82",
+       .expected_a_public =
+       "\x1a\x7f\xeb\x52\x00\xbd\x3c\x31"
+       "\x7d\xb6\x70\xc1\x86\xa6\xc7\xc4"
+       "\x3b\xc5\x5f\x6c\x6f\x58\x3c\xf5"
+       "\xb6\x63\x82\x77\x33\x24\xa1\x5f"
+       "\x6a\xca\x43\x6f\xf7\x7e\xff\x02"
+       "\x37\x08\xcc\x40\x5e\x7a\xfd\x6a"
+       "\x6a\x02\x6e\x41\x87\x68\x38\x77"
+       "\xfa\xa9\x44\x43\x2d\xef\x09\xdf",
+       .expected_ss =
+       "\xea\x17\x6f\x7e\x6e\x57\x26\x38"
+       "\x8b\xfb\x41\xeb\xba\xc8\x6d\xa5"
+       "\xa8\x72\xd1\xff\xc9\x47\x3d\xaa"
+       "\x58\x43\x9f\x34\x0f\x8c\xf3\xc9",
+       .b_public =
+       "\xcc\xb4\xda\x74\xb1\x47\x3f\xea"
+       "\x6c\x70\x9e\x38\x2d\xc7\xaa\xb7"
+       "\x29\xb2\x47\x03\x19\xab\xdd\x34"
+       "\xbd\xa8\x2c\x93\xe1\xa4\x74\xd9"
+       "\x64\x63\xf7\x70\x20\x2f\xa4\xe6"
+       "\x9f\x4a\x38\xcc\xc0\x2c\x49\x2f"
+       "\xb1\x32\xbb\xaf\x22\x61\xda\xcb"
+       "\x6f\xdb\xa9\xaa\xfc\x77\x81\xf3",
+       .secret_size = 40,
+       .b_public_size = 64,
+       .expected_a_public_size = 64,
+       .expected_ss_size = 32
+       }
+};
+
 /*
  * MD4 test vectors from RFC1320
  */

diff --git a/include/crypto/ecdh.h b/include/crypto/ecdh.h
new file mode 100644 (file)
index 0000000..84bad54
--- /dev/null
+++ b/include/crypto/ecdh.h
@@ -0,0 +1,30 @@
+/*
+ * ECDH params to be used with kpp API
+ *
+ * Copyright (c) 2016, Intel Corporation
+ * Authors: Salvatore Benedetto <salvatore.benedetto@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ */
+#ifndef _CRYPTO_ECDH_
+#define _CRYPTO_ECDH_
+
+/* Curves IDs */
+#define ECC_CURVE_NIST_P192    0x0001
+#define ECC_CURVE_NIST_P256    0x0002
+
+struct ecdh {
+       unsigned short curve_id;
+       char *key;
+       unsigned short key_size;
+};
+
+int crypto_ecdh_key_len(const struct ecdh *params);
+int crypto_ecdh_encode_key(char *buf, unsigned int len, const struct ecdh *p);
+int crypto_ecdh_decode_key(const char *buf, unsigned int len, struct ecdh *p);
+
+#endif

diff --git a/include/crypto/kpp.h b/include/crypto/kpp.h
index 937ac122354a349e05b51c6aaec30083dce25581..30791f75c180dc6c9bc6ef7b639d28e02096cd4e 100644 (file)
--- a/include/crypto/kpp.h
+++ b/include/crypto/kpp.h
@@ -243,6 +243,7 @@ static inline void kpp_request_set_output(struct kpp_request *req,
 enum {
        CRYPTO_KPP_SECRET_TYPE_UNKNOWN,
        CRYPTO_KPP_SECRET_TYPE_DH,
+       CRYPTO_KPP_SECRET_TYPE_ECDH,
 };
 
 /**