powerpc/crypto: AES-CTR mode routines for nx encryption

These routines add support for AES in CTR mode on the Power7+ CPU's
in-Nest accelerator driver.

Signed-off-by: Kent Yoder <key@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/drivers/crypto/nx/nx-aes-ctr.c b/drivers/crypto/nx/nx-aes-ctr.c
new file mode 100644 (file)
index 0000000..52d4eb0
--- /dev/null
+++ b/drivers/crypto/nx/nx-aes-ctr.c
@@ -0,0 +1,178 @@
+/**
+ * AES CTR routines supporting the Power 7+ Nest Accelerators driver
+ *
+ * Copyright (C) 2011-2012 International Business Machines Inc.
+ *
+ * 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; version 2 only.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * Author: Kent Yoder <yoder1@us.ibm.com>
+ */
+
+#include <crypto/aes.h>
+#include <crypto/ctr.h>
+#include <crypto/algapi.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/crypto.h>
+#include <asm/vio.h>
+
+#include "nx_csbcpb.h"
+#include "nx.h"
+
+
+static int ctr_aes_nx_set_key(struct crypto_tfm *tfm,
+                             const u8          *in_key,
+                             unsigned int       key_len)
+{
+       struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(tfm);
+       struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
+
+       nx_ctx_init(nx_ctx, HCOP_FC_AES);
+
+       switch (key_len) {
+       case AES_KEYSIZE_128:
+               NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_128);
+               nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_128];
+               break;
+       case AES_KEYSIZE_192:
+               NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_192);
+               nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_192];
+               break;
+       case AES_KEYSIZE_256:
+               NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_256);
+               nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_256];
+               break;
+       default:
+               return -EINVAL;
+       }
+
+       csbcpb->cpb.hdr.mode = NX_MODE_AES_CTR;
+       memcpy(csbcpb->cpb.aes_ctr.key, in_key, key_len);
+
+       return 0;
+}
+
+static int ctr3686_aes_nx_set_key(struct crypto_tfm *tfm,
+                                 const u8          *in_key,
+                                 unsigned int       key_len)
+{
+       struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(tfm);
+
+       if (key_len < CTR_RFC3686_NONCE_SIZE)
+               return -EINVAL;
+
+       memcpy(nx_ctx->priv.ctr.iv,
+              in_key + key_len - CTR_RFC3686_NONCE_SIZE,
+              CTR_RFC3686_NONCE_SIZE);
+
+       key_len -= CTR_RFC3686_NONCE_SIZE;
+
+       return ctr_aes_nx_set_key(tfm, in_key, key_len);
+}
+
+static int ctr_aes_nx_crypt(struct blkcipher_desc *desc,
+                           struct scatterlist    *dst,
+                           struct scatterlist    *src,
+                           unsigned int           nbytes)
+{
+       struct nx_crypto_ctx *nx_ctx = crypto_blkcipher_ctx(desc->tfm);
+       struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
+       int rc;
+
+       if (nbytes > nx_ctx->ap->databytelen)
+               return -EINVAL;
+
+       rc = nx_build_sg_lists(nx_ctx, desc, dst, src, nbytes,
+                              csbcpb->cpb.aes_ctr.iv);
+       if (rc)
+               goto out;
+
+       if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) {
+               rc = -EINVAL;
+               goto out;
+       }
+
+       rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
+                          desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP);
+       if (rc)
+               goto out;
+
+       atomic_inc(&(nx_ctx->stats->aes_ops));
+       atomic64_add(csbcpb->csb.processed_byte_count,
+                    &(nx_ctx->stats->aes_bytes));
+out:
+       return rc;
+}
+
+static int ctr3686_aes_nx_crypt(struct blkcipher_desc *desc,
+                               struct scatterlist    *dst,
+                               struct scatterlist    *src,
+                               unsigned int           nbytes)
+{
+       struct nx_crypto_ctx *nx_ctx = crypto_blkcipher_ctx(desc->tfm);
+       u8 *iv = nx_ctx->priv.ctr.iv;
+
+       memcpy(iv + CTR_RFC3686_NONCE_SIZE,
+              desc->info, CTR_RFC3686_IV_SIZE);
+       iv[15] = 1;
+
+       desc->info = nx_ctx->priv.ctr.iv;
+
+       return ctr_aes_nx_crypt(desc, dst, src, nbytes);
+}
+
+struct crypto_alg nx_ctr_aes_alg = {
+       .cra_name        = "ctr(aes)",
+       .cra_driver_name = "ctr-aes-nx",
+       .cra_priority    = 300,
+       .cra_flags       = CRYPTO_ALG_TYPE_BLKCIPHER,
+       .cra_blocksize   = 1,
+       .cra_ctxsize     = sizeof(struct nx_crypto_ctx),
+       .cra_type        = &crypto_blkcipher_type,
+       .cra_module      = THIS_MODULE,
+       .cra_list        = LIST_HEAD_INIT(nx_ctr_aes_alg.cra_list),
+       .cra_init        = nx_crypto_ctx_aes_ctr_init,
+       .cra_exit        = nx_crypto_ctx_exit,
+       .cra_blkcipher = {
+               .min_keysize = AES_MIN_KEY_SIZE,
+               .max_keysize = AES_MAX_KEY_SIZE,
+               .ivsize      = AES_BLOCK_SIZE,
+               .setkey      = ctr_aes_nx_set_key,
+               .encrypt     = ctr_aes_nx_crypt,
+               .decrypt     = ctr_aes_nx_crypt,
+       }
+};
+
+struct crypto_alg nx_ctr3686_aes_alg = {
+       .cra_name        = "rfc3686(ctr(aes))",
+       .cra_driver_name = "rfc3686-ctr-aes-nx",
+       .cra_priority    = 300,
+       .cra_flags       = CRYPTO_ALG_TYPE_BLKCIPHER,
+       .cra_blocksize   = 1,
+       .cra_ctxsize     = sizeof(struct nx_crypto_ctx),
+       .cra_type        = &crypto_blkcipher_type,
+       .cra_module      = THIS_MODULE,
+       .cra_list        = LIST_HEAD_INIT(nx_ctr3686_aes_alg.cra_list),
+       .cra_init        = nx_crypto_ctx_aes_ctr_init,
+       .cra_exit        = nx_crypto_ctx_exit,
+       .cra_blkcipher = {
+               .min_keysize = AES_MIN_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,
+               .max_keysize = AES_MAX_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,
+               .ivsize      = CTR_RFC3686_IV_SIZE,
+               .geniv       = "seqiv",
+               .setkey      = ctr3686_aes_nx_set_key,
+               .encrypt     = ctr3686_aes_nx_crypt,
+               .decrypt     = ctr3686_aes_nx_crypt,
+       }
+};