BACKPORT, FROMGIT: crypto: chacha20-generic - add XChaCha20 support

Add support for the XChaCha20 stream cipher.  XChaCha20 is the
application of the XSalsa20 construction
(https://cr.yp.to/snuffle/xsalsa-20081128.pdf) to ChaCha20 rather than
to Salsa20.  XChaCha20 extends ChaCha20's nonce length from 64 bits (or
96 bits, depending on convention) to 192 bits, while provably retaining
ChaCha20's security.  XChaCha20 uses the ChaCha20 permutation to map the
key and first 128 nonce bits to a 256-bit subkey.  Then, it does the
ChaCha20 stream cipher with the subkey and remaining 64 bits of nonce.

We need XChaCha support in order to add support for the Adiantum
encryption mode.  Note that to meet our performance requirements, we
actually plan to primarily use the variant XChaCha12.  But we believe
it's wise to first add XChaCha20 as a baseline with a higher security
margin, in case there are any situations where it can be used.
Supporting both variants is straightforward.

Since XChaCha20's subkey differs for each request, XChaCha20 can't be a
template that wraps ChaCha20; that would require re-keying the
underlying ChaCha20 for every request, which wouldn't be thread-safe.
Instead, we make XChaCha20 its own top-level algorithm which calls the
ChaCha20 streaming implementation internally.

Similar to the existing ChaCha20 implementation, we define the IV to be
the nonce and stream position concatenated together.  This allows users
to seek to any position in the stream.

I considered splitting the code into separate chacha20-common, chacha20,
and xchacha20 modules, so that chacha20 and xchacha20 could be
enabled/disabled independently.  However, since nearly all the code is
shared anyway, I ultimately decided there would have been little benefit
to the added complexity of separate modules.

Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Martin Willi <martin@strongswan.org>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
(cherry picked from commit de61d7ae5d3789dcba3749a418f76613fbee8414
 https://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6.git master)
(adjusted test vector formatting for old testmgr)
Bug: 112008522
Test: As series, see Ic61c13b53facfd2173065be715a7ee5f3af8760b
Change-Id: I5c878e1d6577abda11d7b737cbb650baf16b6886
Signed-off-by: Eric Biggers <ebiggers@google.com>

diff --git a/crypto/Kconfig b/crypto/Kconfig
index e3ab31af413b4f42e8ba857d1a2e2f677b749e14..9db49135bdfb1f3f6e80aef832d07d6e51cda32b 100644 (file)
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -1325,18 +1325,22 @@ config CRYPTO_SALSA20
          Bernstein <djb@cr.yp.to>. See <http://cr.yp.to/snuffle.html>
 
 config CRYPTO_CHACHA20
-       tristate "ChaCha20 cipher algorithm"
+       tristate "ChaCha20 stream cipher algorithms"
        select CRYPTO_BLKCIPHER
        help
-         ChaCha20 cipher algorithm, RFC7539.
+         The ChaCha20 and XChaCha20 stream cipher algorithms.
 
          ChaCha20 is a 256-bit high-speed stream cipher designed by Daniel J.
          Bernstein and further specified in RFC7539 for use in IETF protocols.
-         This is the portable C implementation of ChaCha20.
-
-         See also:
+         This is the portable C implementation of ChaCha20.  See also:
          <http://cr.yp.to/chacha/chacha-20080128.pdf>
 
+         XChaCha20 is the application of the XSalsa20 construction to ChaCha20
+         rather than to Salsa20.  XChaCha20 extends ChaCha20's nonce length
+         from 64 bits (or 96 bits using the RFC7539 convention) to 192 bits,
+         while provably retaining ChaCha20's security.  See also:
+         <https://cr.yp.to/snuffle/xsalsa-20081128.pdf>
+
 config CRYPTO_CHACHA20_X86_64
        tristate "ChaCha20 cipher algorithm (x86_64/SSSE3/AVX2)"
        depends on X86 && 64BIT

diff --git a/crypto/chacha20_generic.c b/crypto/chacha20_generic.c
index 3529521d72a417cac7e7b9a769bb7eddf856d4bc..4305b1b62b16ac5617ce8a382919a2d48fa5c225 100644 (file)
--- a/crypto/chacha20_generic.c
+++ b/crypto/chacha20_generic.c
@@ -1,7 +1,8 @@
 /*
- * ChaCha20 256-bit cipher algorithm, RFC7539
+ * ChaCha20 (RFC7539) and XChaCha20 stream cipher algorithms
  *
  * Copyright (C) 2015 Martin Willi
+ * Copyright (C) 2018 Google LLC
  *
  * 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
@@ -36,6 +37,31 @@ static void chacha20_docrypt(u32 *state, u8 *dst, const u8 *src,
        }
 }
 
+static int chacha20_stream_xor(struct skcipher_request *req,
+                              struct chacha20_ctx *ctx, u8 *iv)
+{
+       struct skcipher_walk walk;
+       u32 state[16];
+       int err;
+
+       err = skcipher_walk_virt(&walk, req, false);
+
+       crypto_chacha20_init(state, ctx, iv);
+
+       while (walk.nbytes > 0) {
+               unsigned int nbytes = walk.nbytes;
+
+               if (nbytes < walk.total)
+                       nbytes = round_down(nbytes, walk.stride);
+
+               chacha20_docrypt(state, walk.dst.virt.addr, walk.src.virt.addr,
+                                nbytes);
+               err = skcipher_walk_done(&walk, walk.nbytes - nbytes);
+       }
+
+       return err;
+}
+
 void crypto_chacha20_init(u32 *state, struct chacha20_ctx *ctx, u8 *iv)
 {
        state[0]  = 0x61707865; /* "expa" */
@@ -77,54 +103,74 @@ int crypto_chacha20_crypt(struct skcipher_request *req)
 {
        struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
        struct chacha20_ctx *ctx = crypto_skcipher_ctx(tfm);
-       struct skcipher_walk walk;
-       u32 state[16];
-       int err;
-
-       err = skcipher_walk_virt(&walk, req, false);
 
-       crypto_chacha20_init(state, ctx, walk.iv);
+       return chacha20_stream_xor(req, ctx, req->iv);
+}
+EXPORT_SYMBOL_GPL(crypto_chacha20_crypt);
 
-       while (walk.nbytes > 0) {
-               unsigned int nbytes = walk.nbytes;
+int crypto_xchacha20_crypt(struct skcipher_request *req)
+{
+       struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
+       struct chacha20_ctx *ctx = crypto_skcipher_ctx(tfm);
+       struct chacha20_ctx subctx;
+       u32 state[16];
+       u8 real_iv[16];
 
-               if (nbytes < walk.total)
-                       nbytes = round_down(nbytes, walk.stride);
+       /* Compute the subkey given the original key and first 128 nonce bits */
+       crypto_chacha20_init(state, ctx, req->iv);
+       hchacha20_block(state, subctx.key);
 
-               chacha20_docrypt(state, walk.dst.virt.addr, walk.src.virt.addr,
-                                nbytes);
-               err = skcipher_walk_done(&walk, walk.nbytes - nbytes);
-       }
+       /* Build the real IV */
+       memcpy(&real_iv[0], req->iv + 24, 8); /* stream position */
+       memcpy(&real_iv[8], req->iv + 16, 8); /* remaining 64 nonce bits */
 
-       return err;
+       /* Generate the stream and XOR it with the data */
+       return chacha20_stream_xor(req, &subctx, real_iv);
 }
-EXPORT_SYMBOL_GPL(crypto_chacha20_crypt);
-
-static struct skcipher_alg alg = {
-       .base.cra_name          = "chacha20",
-       .base.cra_driver_name   = "chacha20-generic",
-       .base.cra_priority      = 100,
-       .base.cra_blocksize     = 1,
-       .base.cra_ctxsize       = sizeof(struct chacha20_ctx),
-       .base.cra_module        = THIS_MODULE,
-
-       .min_keysize            = CHACHA20_KEY_SIZE,
-       .max_keysize            = CHACHA20_KEY_SIZE,
-       .ivsize                 = CHACHA20_IV_SIZE,
-       .chunksize              = CHACHA20_BLOCK_SIZE,
-       .setkey                 = crypto_chacha20_setkey,
-       .encrypt                = crypto_chacha20_crypt,
-       .decrypt                = crypto_chacha20_crypt,
+EXPORT_SYMBOL_GPL(crypto_xchacha20_crypt);
+
+static struct skcipher_alg algs[] = {
+       {
+               .base.cra_name          = "chacha20",
+               .base.cra_driver_name   = "chacha20-generic",
+               .base.cra_priority      = 100,
+               .base.cra_blocksize     = 1,
+               .base.cra_ctxsize       = sizeof(struct chacha20_ctx),
+               .base.cra_module        = THIS_MODULE,
+
+               .min_keysize            = CHACHA20_KEY_SIZE,
+               .max_keysize            = CHACHA20_KEY_SIZE,
+               .ivsize                 = CHACHA20_IV_SIZE,
+               .chunksize              = CHACHA20_BLOCK_SIZE,
+               .setkey                 = crypto_chacha20_setkey,
+               .encrypt                = crypto_chacha20_crypt,
+               .decrypt                = crypto_chacha20_crypt,
+       }, {
+               .base.cra_name          = "xchacha20",
+               .base.cra_driver_name   = "xchacha20-generic",
+               .base.cra_priority      = 100,
+               .base.cra_blocksize     = 1,
+               .base.cra_ctxsize       = sizeof(struct chacha20_ctx),
+               .base.cra_module        = THIS_MODULE,
+
+               .min_keysize            = CHACHA20_KEY_SIZE,
+               .max_keysize            = CHACHA20_KEY_SIZE,
+               .ivsize                 = XCHACHA20_IV_SIZE,
+               .chunksize              = CHACHA20_BLOCK_SIZE,
+               .setkey                 = crypto_chacha20_setkey,
+               .encrypt                = crypto_xchacha20_crypt,
+               .decrypt                = crypto_xchacha20_crypt,
+       }
 };
 
 static int __init chacha20_generic_mod_init(void)
 {
-       return crypto_register_skcipher(&alg);
+       return crypto_register_skciphers(algs, ARRAY_SIZE(algs));
 }
 
 static void __exit chacha20_generic_mod_fini(void)
 {
-       crypto_unregister_skcipher(&alg);
+       crypto_unregister_skciphers(algs, ARRAY_SIZE(algs));
 }
 
 module_init(chacha20_generic_mod_init);
@@ -132,6 +178,8 @@ module_exit(chacha20_generic_mod_fini);
 
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Martin Willi <martin@strongswan.org>");
-MODULE_DESCRIPTION("chacha20 cipher algorithm");
+MODULE_DESCRIPTION("ChaCha20 and XChaCha20 stream ciphers (generic)");
 MODULE_ALIAS_CRYPTO("chacha20");
 MODULE_ALIAS_CRYPTO("chacha20-generic");
+MODULE_ALIAS_CRYPTO("xchacha20");
+MODULE_ALIAS_CRYPTO("xchacha20-generic");

diff --git a/crypto/testmgr.c b/crypto/testmgr.c
index 8a124d3e911310dda599035ab2e63a85cd7d6d5a..dd92cc29e6efeafc88c85c27995f8189fa890957 100644 (file)
--- a/crypto/testmgr.c
+++ b/crypto/testmgr.c
@@ -3547,6 +3547,15 @@ static const struct alg_test_desc alg_test_descs[] = {
                .suite = {
                        .hash = __VECS(aes_xcbc128_tv_template)
                }
+       }, {
+               .alg = "xchacha20",
+               .test = alg_test_skcipher,
+               .suite = {
+                       .cipher = {
+                               .enc = __VECS(xchacha20_tv_template),
+                               .dec = __VECS(xchacha20_tv_template)
+                       }
+               },
        }, {
                .alg = "xts(aes)",
                .test = alg_test_skcipher,

diff --git a/crypto/testmgr.h b/crypto/testmgr.h
index d39431877e81f179f9d924d2f40a7b54edc5ba9f..76420201ed7e527e49cb55b925277e0d145c561f 100644 (file)
--- a/crypto/testmgr.h
+++ b/crypto/testmgr.h
@@ -33059,6 +33059,589 @@ static const struct cipher_testvec chacha20_enc_tv_template[] = {
        },
 };
 
+static const struct cipher_testvec xchacha20_tv_template[] = {
+       { /* from libsodium test/default/xchacha20.c */
+               .key    = "\x79\xc9\x97\x98\xac\x67\x30\x0b"
+                         "\xbb\x27\x04\xc9\x5c\x34\x1e\x32"
+                         "\x45\xf3\xdc\xb2\x17\x61\xb9\x8e"
+                         "\x52\xff\x45\xb2\x4f\x30\x4f\xc4",
+               .klen   = 32,
+               .iv     = "\xb3\x3f\xfd\x30\x96\x47\x9b\xcf"
+                         "\xbc\x9a\xee\x49\x41\x76\x88\xa0"
+                         "\xa2\x55\x4f\x8d\x95\x38\x94\x19"
+                         "\x00\x00\x00\x00\x00\x00\x00\x00",
+               .input  = "\x00\x00\x00\x00\x00\x00\x00\x00"
+                         "\x00\x00\x00\x00\x00\x00\x00\x00"
+                         "\x00\x00\x00\x00\x00\x00\x00\x00"
+                         "\x00\x00\x00\x00\x00",
+               .result = "\xc6\xe9\x75\x81\x60\x08\x3a\xc6"
+                         "\x04\xef\x90\xe7\x12\xce\x6e\x75"
+                         "\xd7\x79\x75\x90\x74\x4e\x0c\xf0"
+                         "\x60\xf0\x13\x73\x9c",
+               .ilen   = 29,
+               .rlen   = 29,
+       }, { /* from libsodium test/default/xchacha20.c */
+               .key    = "\x9d\x23\xbd\x41\x49\xcb\x97\x9c"
+                         "\xcf\x3c\x5c\x94\xdd\x21\x7e\x98"
+                         "\x08\xcb\x0e\x50\xcd\x0f\x67\x81"
+                         "\x22\x35\xea\xaf\x60\x1d\x62\x32",
+               .klen   = 32,
+               .iv     = "\xc0\x47\x54\x82\x66\xb7\xc3\x70"
+                         "\xd3\x35\x66\xa2\x42\x5c\xbf\x30"
+                         "\xd8\x2d\x1e\xaf\x52\x94\x10\x9e"
+                         "\x00\x00\x00\x00\x00\x00\x00\x00",
+               .input  = "\x00\x00\x00\x00\x00\x00\x00\x00"
+                         "\x00\x00\x00\x00\x00\x00\x00\x00"
+                         "\x00\x00\x00\x00\x00\x00\x00\x00"
+                         "\x00\x00\x00\x00\x00\x00\x00\x00"
+                         "\x00\x00\x00\x00\x00\x00\x00\x00"
+                         "\x00\x00\x00\x00\x00\x00\x00\x00"
+                         "\x00\x00\x00\x00\x00\x00\x00\x00"
+                         "\x00\x00\x00\x00\x00\x00\x00\x00"
+                         "\x00\x00\x00\x00\x00\x00\x00\x00"
+                         "\x00\x00\x00\x00\x00\x00\x00\x00"
+                         "\x00\x00\x00\x00\x00\x00\x00\x00"
+                         "\x00\x00\x00",
+               .result = "\xa2\x12\x09\x09\x65\x94\xde\x8c"
+                         "\x56\x67\xb1\xd1\x3a\xd9\x3f\x74"
+                         "\x41\x06\xd0\x54\xdf\x21\x0e\x47"
+                         "\x82\xcd\x39\x6f\xec\x69\x2d\x35"
+                         "\x15\xa2\x0b\xf3\x51\xee\xc0\x11"
+                         "\xa9\x2c\x36\x78\x88\xbc\x46\x4c"
+                         "\x32\xf0\x80\x7a\xcd\x6c\x20\x3a"
+                         "\x24\x7e\x0d\xb8\x54\x14\x84\x68"
+                         "\xe9\xf9\x6b\xee\x4c\xf7\x18\xd6"
+                         "\x8d\x5f\x63\x7c\xbd\x5a\x37\x64"
+                         "\x57\x78\x8e\x6f\xae\x90\xfc\x31"
+                         "\x09\x7c\xfc",
+               .ilen   = 91,
+               .rlen   = 91,
+       }, { /* Taken from the ChaCha20 test vectors, appended 16 random bytes
+               to nonce, and recomputed the ciphertext with libsodium */
+               .key    = "\x00\x00\x00\x00\x00\x00\x00\x00"
+                         "\x00\x00\x00\x00\x00\x00\x00\x00"
+                         "\x00\x00\x00\x00\x00\x00\x00\x00"
+                         "\x00\x00\x00\x00\x00\x00\x00\x00",
+               .klen   = 32,
+               .iv     = "\x00\x00\x00\x00\x00\x00\x00\x00"
+                         "\x00\x00\x00\x00\x67\xc6\x69\x73"
+                         "\x51\xff\x4a\xec\x29\xcd\xba\xab"
+                         "\x00\x00\x00\x00\x00\x00\x00\x00",
+               .input  = "\x00\x00\x00\x00\x00\x00\x00\x00"
+                         "\x00\x00\x00\x00\x00\x00\x00\x00"
+                         "\x00\x00\x00\x00\x00\x00\x00\x00"
+                         "\x00\x00\x00\x00\x00\x00\x00\x00"
+                         "\x00\x00\x00\x00\x00\x00\x00\x00"
+                         "\x00\x00\x00\x00\x00\x00\x00\x00"
+                         "\x00\x00\x00\x00\x00\x00\x00\x00"
+                         "\x00\x00\x00\x00\x00\x00\x00\x00",
+               .result = "\x9c\x49\x2a\xe7\x8a\x2f\x93\xc7"
+                         "\xb3\x33\x6f\x82\x17\xd8\xc4\x1e"
+                         "\xad\x80\x11\x11\x1d\x4c\x16\x18"
+                         "\x07\x73\x9b\x4f\xdb\x7c\xcb\x47"
+                         "\xfd\xef\x59\x74\xfa\x3f\xe5\x4c"
+                         "\x9b\xd0\xea\xbc\xba\x56\xad\x32"
+                         "\x03\xdc\xf8\x2b\xc1\xe1\x75\x67"
+                         "\x23\x7b\xe6\xfc\xd4\x03\x86\x54",
+               .ilen   = 64,
+               .rlen   = 64,
+       }, { /* Taken from the ChaCha20 test vectors, appended 16 random bytes
+               to nonce, and recomputed the ciphertext with libsodium */
+               .key    = "\x00\x00\x00\x00\x00\x00\x00\x00"
+                         "\x00\x00\x00\x00\x00\x00\x00\x00"
+                         "\x00\x00\x00\x00\x00\x00\x00\x00"
+                         "\x00\x00\x00\x00\x00\x00\x00\x01",
+               .klen   = 32,
+               .iv     = "\x00\x00\x00\x00\x00\x00\x00\x00"
+                         "\x00\x00\x00\x02\xf2\xfb\xe3\x46"
+                         "\x7c\xc2\x54\xf8\x1b\xe8\xe7\x8d"
+                         "\x01\x00\x00\x00\x00\x00\x00\x00",
+               .input  = "\x41\x6e\x79\x20\x73\x75\x62\x6d"
+                         "\x69\x73\x73\x69\x6f\x6e\x20\x74"
+                         "\x6f\x20\x74\x68\x65\x20\x49\x45"
+                         "\x54\x46\x20\x69\x6e\x74\x65\x6e"
+                         "\x64\x65\x64\x20\x62\x79\x20\x74"
+                         "\x68\x65\x20\x43\x6f\x6e\x74\x72"
+                         "\x69\x62\x75\x74\x6f\x72\x20\x66"
+                         "\x6f\x72\x20\x70\x75\x62\x6c\x69"
+                         "\x63\x61\x74\x69\x6f\x6e\x20\x61"
+                         "\x73\x20\x61\x6c\x6c\x20\x6f\x72"
+                         "\x20\x70\x61\x72\x74\x20\x6f\x66"
+                         "\x20\x61\x6e\x20\x49\x45\x54\x46"
+                         "\x20\x49\x6e\x74\x65\x72\x6e\x65"
+                         "\x74\x2d\x44\x72\x61\x66\x74\x20"
+                         "\x6f\x72\x20\x52\x46\x43\x20\x61"
+                         "\x6e\x64\x20\x61\x6e\x79\x20\x73"
+                         "\x74\x61\x74\x65\x6d\x65\x6e\x74"
+                         "\x20\x6d\x61\x64\x65\x20\x77\x69"
+                         "\x74\x68\x69\x6e\x20\x74\x68\x65"
+                         "\x20\x63\x6f\x6e\x74\x65\x78\x74"
+                         "\x20\x6f\x66\x20\x61\x6e\x20\x49"
+                         "\x45\x54\x46\x20\x61\x63\x74\x69"
+                         "\x76\x69\x74\x79\x20\x69\x73\x20"
+                         "\x63\x6f\x6e\x73\x69\x64\x65\x72"
+                         "\x65\x64\x20\x61\x6e\x20\x22\x49"
+                         "\x45\x54\x46\x20\x43\x6f\x6e\x74"
+                         "\x72\x69\x62\x75\x74\x69\x6f\x6e"
+                         "\x22\x2e\x20\x53\x75\x63\x68\x20"
+                         "\x73\x74\x61\x74\x65\x6d\x65\x6e"
+                         "\x74\x73\x20\x69\x6e\x63\x6c\x75"
+                         "\x64\x65\x20\x6f\x72\x61\x6c\x20"
+                         "\x73\x74\x61\x74\x65\x6d\x65\x6e"
+                         "\x74\x73\x20\x69\x6e\x20\x49\x45"
+                         "\x54\x46\x20\x73\x65\x73\x73\x69"
+                         "\x6f\x6e\x73\x2c\x20\x61\x73\x20"
+                         "\x77\x65\x6c\x6c\x20\x61\x73\x20"
+                         "\x77\x72\x69\x74\x74\x65\x6e\x20"
+                         "\x61\x6e\x64\x20\x65\x6c\x65\x63"
+                         "\x74\x72\x6f\x6e\x69\x63\x20\x63"
+                         "\x6f\x6d\x6d\x75\x6e\x69\x63\x61"
+                         "\x74\x69\x6f\x6e\x73\x20\x6d\x61"
+                         "\x64\x65\x20\x61\x74\x20\x61\x6e"
+                         "\x79\x20\x74\x69\x6d\x65\x20\x6f"
+                         "\x72\x20\x70\x6c\x61\x63\x65\x2c"
+                         "\x20\x77\x68\x69\x63\x68\x20\x61"
+                         "\x72\x65\x20\x61\x64\x64\x72\x65"
+                         "\x73\x73\x65\x64\x20\x74\x6f",
+               .result = "\xf9\xab\x7a\x4a\x60\xb8\x5f\xa0"
+                         "\x50\xbb\x57\xce\xef\x8c\xc1\xd9"
+                         "\x24\x15\xb3\x67\x5e\x7f\x01\xf6"
+                         "\x1c\x22\xf6\xe5\x71\xb1\x43\x64"
+                         "\x63\x05\xd5\xfc\x5c\x3d\xc0\x0e"
+                         "\x23\xef\xd3\x3b\xd9\xdc\x7f\xa8"
+                         "\x58\x26\xb3\xd0\xc2\xd5\x04\x3f"
+                         "\x0a\x0e\x8f\x17\xe4\xcd\xf7\x2a"
+                         "\xb4\x2c\x09\xe4\x47\xec\x8b\xfb"
+                         "\x59\x37\x7a\xa1\xd0\x04\x7e\xaa"
+                         "\xf1\x98\x5f\x24\x3d\x72\x9a\x43"
+                         "\xa4\x36\x51\x92\x22\x87\xff\x26"
+                         "\xce\x9d\xeb\x59\x78\x84\x5e\x74"
+                         "\x97\x2e\x63\xc0\xef\x29\xf7\x8a"
+                         "\xb9\xee\x35\x08\x77\x6a\x35\x9a"
+                         "\x3e\xe6\x4f\x06\x03\x74\x1b\xc1"
+                         "\x5b\xb3\x0b\x89\x11\x07\xd3\xb7"
+                         "\x53\xd6\x25\x04\xd9\x35\xb4\x5d"
+                         "\x4c\x33\x5a\xc2\x42\x4c\xe6\xa4"
+                         "\x97\x6e\x0e\xd2\xb2\x8b\x2f\x7f"
+                         "\x28\xe5\x9f\xac\x4b\x2e\x02\xab"
+                         "\x85\xfa\xa9\x0d\x7c\x2d\x10\xe6"
+                         "\x91\xab\x55\x63\xf0\xde\x3a\x94"
+                         "\x25\x08\x10\x03\xc2\x68\xd1\xf4"
+                         "\xaf\x7d\x9c\x99\xf7\x86\x96\x30"
+                         "\x60\xfc\x0b\xe6\xa8\x80\x15\xb0"
+                         "\x81\xb1\x0c\xbe\xb9\x12\x18\x25"
+                         "\xe9\x0e\xb1\xe7\x23\xb2\xef\x4a"
+                         "\x22\x8f\xc5\x61\x89\xd4\xe7\x0c"
+                         "\x64\x36\x35\x61\xb6\x34\x60\xf7"
+                         "\x7b\x61\x37\x37\x12\x10\xa2\xf6"
+                         "\x7e\xdb\x7f\x39\x3f\xb6\x8e\x89"
+                         "\x9e\xf3\xfe\x13\x98\xbb\x66\x5a"
+                         "\xec\xea\xab\x3f\x9c\x87\xc4\x8c"
+                         "\x8a\x04\x18\x49\xfc\x77\x11\x50"
+                         "\x16\xe6\x71\x2b\xee\xc0\x9c\xb6"
+                         "\x87\xfd\x80\xff\x0b\x1d\x73\x38"
+                         "\xa4\x1d\x6f\xae\xe4\x12\xd7\x93"
+                         "\x9d\xcd\x38\x26\x09\x40\x52\xcd"
+                         "\x67\x01\x67\x26\xe0\x3e\x98\xa8"
+                         "\xe8\x1a\x13\x41\xbb\x90\x4d\x87"
+                         "\xbb\x42\x82\x39\xce\x3a\xd0\x18"
+                         "\x6d\x7b\x71\x8f\xbb\x2c\x6a\xd1"
+                         "\xbd\xf5\xc7\x8a\x7e\xe1\x1e\x0f"
+                         "\x0d\x0d\x13\x7c\xd9\xd8\x3c\x91"
+                         "\xab\xff\x1f\x12\xc3\xee\xe5\x65"
+                         "\x12\x8d\x7b\x61\xe5\x1f\x98",
+               .ilen   = 375,
+               .rlen   = 375,
+               .also_non_np = 1,
+               .np     = 3,
+               .tap    = { 375 - 20, 4, 16 },
+
+       }, { /* Taken from the ChaCha20 test vectors, appended 16 random bytes
+               to nonce, and recomputed the ciphertext with libsodium */
+               .key    = "\x1c\x92\x40\xa5\xeb\x55\xd3\x8a"
+                         "\xf3\x33\x88\x86\x04\xf6\xb5\xf0"
+                         "\x47\x39\x17\xc1\x40\x2b\x80\x09"
+                         "\x9d\xca\x5c\xbc\x20\x70\x75\xc0",
+               .klen   = 32,
+               .iv     = "\x00\x00\x00\x00\x00\x00\x00\x00"
+                         "\x00\x00\x00\x02\x76\x5a\x2e\x63"
+                         "\x33\x9f\xc9\x9a\x66\x32\x0d\xb7"
+                         "\x2a\x00\x00\x00\x00\x00\x00\x00",
+               .input  = "\x27\x54\x77\x61\x73\x20\x62\x72"
+                         "\x69\x6c\x6c\x69\x67\x2c\x20\x61"
+                         "\x6e\x64\x20\x74\x68\x65\x20\x73"
+                         "\x6c\x69\x74\x68\x79\x20\x74\x6f"
+                         "\x76\x65\x73\x0a\x44\x69\x64\x20"
+                         "\x67\x79\x72\x65\x20\x61\x6e\x64"
+                         "\x20\x67\x69\x6d\x62\x6c\x65\x20"
+                         "\x69\x6e\x20\x74\x68\x65\x20\x77"
+                         "\x61\x62\x65\x3a\x0a\x41\x6c\x6c"
+                         "\x20\x6d\x69\x6d\x73\x79\x20\x77"
+                         "\x65\x72\x65\x20\x74\x68\x65\x20"
+                         "\x62\x6f\x72\x6f\x67\x6f\x76\x65"
+                         "\x73\x2c\x0a\x41\x6e\x64\x20\x74"
+                         "\x68\x65\x20\x6d\x6f\x6d\x65\x20"
+                         "\x72\x61\x74\x68\x73\x20\x6f\x75"
+                         "\x74\x67\x72\x61\x62\x65\x2e",
+               .result = "\x95\xb9\x51\xe7\x8f\xb4\xa4\x03"
+                         "\xca\x37\xcc\xde\x60\x1d\x8c\xe2"
+                         "\xf1\xbb\x8a\x13\x7f\x61\x85\xcc"
+                         "\xad\xf4\xf0\xdc\x86\xa6\x1e\x10"
+                         "\xbc\x8e\xcb\x38\x2b\xa5\xc8\x8f"
+                         "\xaa\x03\x3d\x53\x4a\x42\xb1\x33"
+                         "\xfc\xd3\xef\xf0\x8e\x7e\x10\x9c"
+                         "\x6f\x12\x5e\xd4\x96\xfe\x5b\x08"
+                         "\xb6\x48\xf0\x14\x74\x51\x18\x7c"
+                         "\x07\x92\xfc\xac\x9d\xf1\x94\xc0"
+                         "\xc1\x9d\xc5\x19\x43\x1f\x1d\xbb"
+                         "\x07\xf0\x1b\x14\x25\x45\xbb\xcb"
+                         "\x5c\xe2\x8b\x28\xf3\xcf\x47\x29"
+                         "\x27\x79\x67\x24\xa6\x87\xc2\x11"
+                         "\x65\x03\xfa\x45\xf7\x9e\x53\x7a"
+                         "\x99\xf1\x82\x25\x4f\x8d\x07",
+               .ilen   = 127,
+               .rlen   = 127,
+       }, { /* Taken from the ChaCha20 test vectors, appended 16 random bytes
+               to nonce, and recomputed the ciphertext with libsodium */
+               .key    = "\x1c\x92\x40\xa5\xeb\x55\xd3\x8a"
+                         "\xf3\x33\x88\x86\x04\xf6\xb5\xf0"
+                         "\x47\x39\x17\xc1\x40\x2b\x80\x09"
+                         "\x9d\xca\x5c\xbc\x20\x70\x75\xc0",
+               .klen   = 32,
+               .iv     = "\x00\x00\x00\x00\x00\x00\x00\x00"
+                         "\x00\x00\x00\x01\x31\x58\xa3\x5a"
+                         "\x25\x5d\x05\x17\x58\xe9\x5e\xd4"
+                         "\x1c\x00\x00\x00\x00\x00\x00\x00",
+               .input  = "\x49\xee\xe0\xdc\x24\x90\x40\xcd"
+                         "\xc5\x40\x8f\x47\x05\xbc\xdd\x81"
+                         "\x47\xc6\x8d\xe6\xb1\x8f\xd7\xcb"
+                         "\x09\x0e\x6e\x22\x48\x1f\xbf\xb8"
+                         "\x5c\xf7\x1e\x8a\xc1\x23\xf2\xd4"
+                         "\x19\x4b\x01\x0f\x4e\xa4\x43\xce"
+                         "\x01\xc6\x67\xda\x03\x91\x18\x90"
+                         "\xa5\xa4\x8e\x45\x03\xb3\x2d\xac"
+                         "\x74\x92\xd3\x53\x47\xc8\xdd\x25"
+                         "\x53\x6c\x02\x03\x87\x0d\x11\x0c"
+                         "\x58\xe3\x12\x18\xfd\x2a\x5b\x40"
+                         "\x0c\x30\xf0\xb8\x3f\x43\xce\xae"
+                         "\x65\x3a\x7d\x7c\xf4\x54\xaa\xcc"
+                         "\x33\x97\xc3\x77\xba\xc5\x70\xde"
+                         "\xd7\xd5\x13\xa5\x65\xc4\x5f\x0f"
+                         "\x46\x1a\x0d\x97\xb5\xf3\xbb\x3c"
+                         "\x84\x0f\x2b\xc5\xaa\xea\xf2\x6c"
+                         "\xc9\xb5\x0c\xee\x15\xf3\x7d\xbe"
+                         "\x9f\x7b\x5a\xa6\xae\x4f\x83\xb6"
+                         "\x79\x49\x41\xf4\x58\x18\xcb\x86"
+                         "\x7f\x30\x0e\xf8\x7d\x44\x36\xea"
+                         "\x75\xeb\x88\x84\x40\x3c\xad\x4f"
+                         "\x6f\x31\x6b\xaa\x5d\xe5\xa5\xc5"
+                         "\x21\x66\xe9\xa7\xe3\xb2\x15\x88"
+                         "\x78\xf6\x79\xa1\x59\x47\x12\x4e"
+                         "\x9f\x9f\x64\x1a\xa0\x22\x5b\x08"
+                         "\xbe\x7c\x36\xc2\x2b\x66\x33\x1b"
+                         "\xdd\x60\x71\xf7\x47\x8c\x61\xc3"
+                         "\xda\x8a\x78\x1e\x16\xfa\x1e\x86"
+                         "\x81\xa6\x17\x2a\xa7\xb5\xc2\xe7"
+                         "\xa4\xc7\x42\xf1\xcf\x6a\xca\xb4"
+                         "\x45\xcf\xf3\x93\xf0\xe7\xea\xf6"
+                         "\xf4\xe6\x33\x43\x84\x93\xa5\x67"
+                         "\x9b\x16\x58\x58\x80\x0f\x2b\x5c"
+                         "\x24\x74\x75\x7f\x95\x81\xb7\x30"
+                         "\x7a\x33\xa7\xf7\x94\x87\x32\x27"
+                         "\x10\x5d\x14\x4c\x43\x29\xdd\x26"
+                         "\xbd\x3e\x3c\x0e\xfe\x0e\xa5\x10"
+                         "\xea\x6b\x64\xfd\x73\xc6\xed\xec"
+                         "\xa8\xc9\xbf\xb3\xba\x0b\x4d\x07"
+                         "\x70\xfc\x16\xfd\x79\x1e\xd7\xc5"
+                         "\x49\x4e\x1c\x8b\x8d\x79\x1b\xb1"
+                         "\xec\xca\x60\x09\x4c\x6a\xd5\x09"
+                         "\x49\x46\x00\x88\x22\x8d\xce\xea"
+                         "\xb1\x17\x11\xde\x42\xd2\x23\xc1"
+                         "\x72\x11\xf5\x50\x73\x04\x40\x47"
+                         "\xf9\x5d\xe7\xa7\x26\xb1\x7e\xb0"
+                         "\x3f\x58\xc1\x52\xab\x12\x67\x9d"
+                         "\x3f\x43\x4b\x68\xd4\x9c\x68\x38"
+                         "\x07\x8a\x2d\x3e\xf3\xaf\x6a\x4b"
+                         "\xf9\xe5\x31\x69\x22\xf9\xa6\x69"
+                         "\xc6\x9c\x96\x9a\x12\x35\x95\x1d"
+                         "\x95\xd5\xdd\xbe\xbf\x93\x53\x24"
+                         "\xfd\xeb\xc2\x0a\x64\xb0\x77\x00"
+                         "\x6f\x88\xc4\x37\x18\x69\x7c\xd7"
+                         "\x41\x92\x55\x4c\x03\xa1\x9a\x4b"
+                         "\x15\xe5\xdf\x7f\x37\x33\x72\xc1"
+                         "\x8b\x10\x67\xa3\x01\x57\x94\x25"
+                         "\x7b\x38\x71\x7e\xdd\x1e\xcc\x73"
+                         "\x55\xd2\x8e\xeb\x07\xdd\xf1\xda"
+                         "\x58\xb1\x47\x90\xfe\x42\x21\x72"
+                         "\xa3\x54\x7a\xa0\x40\xec\x9f\xdd"
+                         "\xc6\x84\x6e\xca\xae\xe3\x68\xb4"
+                         "\x9d\xe4\x78\xff\x57\xf2\xf8\x1b"
+                         "\x03\xa1\x31\xd9\xde\x8d\xf5\x22"
+                         "\x9c\xdd\x20\xa4\x1e\x27\xb1\x76"
+                         "\x4f\x44\x55\xe2\x9b\xa1\x9c\xfe"
+                         "\x54\xf7\x27\x1b\xf4\xde\x02\xf5"
+                         "\x1b\x55\x48\x5c\xdc\x21\x4b\x9e"
+                         "\x4b\x6e\xed\x46\x23\xdc\x65\xb2"
+                         "\xcf\x79\x5f\x28\xe0\x9e\x8b\xe7"
+                         "\x4c\x9d\x8a\xff\xc1\xa6\x28\xb8"
+                         "\x65\x69\x8a\x45\x29\xef\x74\x85"
+                         "\xde\x79\xc7\x08\xae\x30\xb0\xf4"
+                         "\xa3\x1d\x51\x41\xab\xce\xcb\xf6"
+                         "\xb5\xd8\x6d\xe0\x85\xe1\x98\xb3"
+                         "\x43\xbb\x86\x83\x0a\xa0\xf5\xb7"
+                         "\x04\x0b\xfa\x71\x1f\xb0\xf6\xd9"
+                         "\x13\x00\x15\xf0\xc7\xeb\x0d\x5a"
+                         "\x9f\xd7\xb9\x6c\x65\x14\x22\x45"
+                         "\x6e\x45\x32\x3e\x7e\x60\x1a\x12"
+                         "\x97\x82\x14\xfb\xaa\x04\x22\xfa"
+                         "\xa0\xe5\x7e\x8c\x78\x02\x48\x5d"
+                         "\x78\x33\x5a\x7c\xad\xdb\x29\xce"
+                         "\xbb\x8b\x61\xa4\xb7\x42\xe2\xac"
+                         "\x8b\x1a\xd9\x2f\x0b\x8b\x62\x21"
+                         "\x83\x35\x7e\xad\x73\xc2\xb5\x6c"
+                         "\x10\x26\x38\x07\xe5\xc7\x36\x80"
+                         "\xe2\x23\x12\x61\xf5\x48\x4b\x2b"
+                         "\xc5\xdf\x15\xd9\x87\x01\xaa\xac"
+                         "\x1e\x7c\xad\x73\x78\x18\x63\xe0"
+                         "\x8b\x9f\x81\xd8\x12\x6a\x28\x10"
+                         "\xbe\x04\x68\x8a\x09\x7c\x1b\x1c"
+                         "\x83\x66\x80\x47\x80\xe8\xfd\x35"
+                         "\x1c\x97\x6f\xae\x49\x10\x66\xcc"
+                         "\xc6\xd8\xcc\x3a\x84\x91\x20\x77"
+                         "\x72\xe4\x24\xd2\x37\x9f\xc5\xc9"
+                         "\x25\x94\x10\x5f\x40\x00\x64\x99"
+                         "\xdc\xae\xd7\x21\x09\x78\x50\x15"
+                         "\xac\x5f\xc6\x2c\xa2\x0b\xa9\x39"
+                         "\x87\x6e\x6d\xab\xde\x08\x51\x16"
+                         "\xc7\x13\xe9\xea\xed\x06\x8e\x2c"
+                         "\xf8\x37\x8c\xf0\xa6\x96\x8d\x43"
+                         "\xb6\x98\x37\xb2\x43\xed\xde\xdf"
+                         "\x89\x1a\xe7\xeb\x9d\xa1\x7b\x0b"
+                         "\x77\xb0\xe2\x75\xc0\xf1\x98\xd9"
+                         "\x80\x55\xc9\x34\x91\xd1\x59\xe8"
+                         "\x4b\x0f\xc1\xa9\x4b\x7a\x84\x06"
+                         "\x20\xa8\x5d\xfa\xd1\xde\x70\x56"
+                         "\x2f\x9e\x91\x9c\x20\xb3\x24\xd8"
+                         "\x84\x3d\xe1\x8c\x7e\x62\x52\xe5"
+                         "\x44\x4b\x9f\xc2\x93\x03\xea\x2b"
+                         "\x59\xc5\xfa\x3f\x91\x2b\xbb\x23"
+                         "\xf5\xb2\x7b\xf5\x38\xaf\xb3\xee"
+                         "\x63\xdc\x7b\xd1\xff\xaa\x8b\xab"
+                         "\x82\x6b\x37\x04\xeb\x74\xbe\x79"
+                         "\xb9\x83\x90\xef\x20\x59\x46\xff"
+                         "\xe9\x97\x3e\x2f\xee\xb6\x64\x18"
+                         "\x38\x4c\x7a\x4a\xf9\x61\xe8\x9a"
+                         "\xa1\xb5\x01\xa6\x47\xd3\x11\xd4"
+                         "\xce\xd3\x91\x49\x88\xc7\xb8\x4d"
+                         "\xb1\xb9\x07\x6d\x16\x72\xae\x46"
+                         "\x5e\x03\xa1\x4b\xb6\x02\x30\xa8"
+                         "\x3d\xa9\x07\x2a\x7c\x19\xe7\x62"
+                         "\x87\xe3\x82\x2f\x6f\xe1\x09\xd9"
+                         "\x94\x97\xea\xdd\x58\x9e\xae\x76"
+                         "\x7e\x35\xe5\xb4\xda\x7e\xf4\xde"
+                         "\xf7\x32\x87\xcd\x93\xbf\x11\x56"
+                         "\x11\xbe\x08\x74\xe1\x69\xad\xe2"
+                         "\xd7\xf8\x86\x75\x8a\x3c\xa4\xbe"
+                         "\x70\xa7\x1b\xfc\x0b\x44\x2a\x76"
+                         "\x35\xea\x5d\x85\x81\xaf\x85\xeb"
+                         "\xa0\x1c\x61\xc2\xf7\x4f\xa5\xdc"
+                         "\x02\x7f\xf6\x95\x40\x6e\x8a\x9a"
+                         "\xf3\x5d\x25\x6e\x14\x3a\x22\xc9"
+                         "\x37\x1c\xeb\x46\x54\x3f\xa5\x91"
+                         "\xc2\xb5\x8c\xfe\x53\x08\x97\x32"
+                         "\x1b\xb2\x30\x27\xfe\x25\x5d\xdc"
+                         "\x08\x87\xd0\xe5\x94\x1a\xd4\xf1"
+                         "\xfe\xd6\xb4\xa3\xe6\x74\x81\x3c"
+                         "\x1b\xb7\x31\xa7\x22\xfd\xd4\xdd"
+                         "\x20\x4e\x7c\x51\xb0\x60\x73\xb8"
+                         "\x9c\xac\x91\x90\x7e\x01\xb0\xe1"
+                         "\x8a\x2f\x75\x1c\x53\x2a\x98\x2a"
+                         "\x06\x52\x95\x52\xb2\xe9\x25\x2e"
+                         "\x4c\xe2\x5a\x00\xb2\x13\x81\x03"
+                         "\x77\x66\x0d\xa5\x99\xda\x4e\x8c"
+                         "\xac\xf3\x13\x53\x27\x45\xaf\x64"
+                         "\x46\xdc\xea\x23\xda\x97\xd1\xab"
+                         "\x7d\x6c\x30\x96\x1f\xbc\x06\x34"
+                         "\x18\x0b\x5e\x21\x35\x11\x8d\x4c"
+                         "\xe0\x2d\xe9\x50\x16\x74\x81\xa8"
+                         "\xb4\x34\xb9\x72\x42\xa6\xcc\xbc"
+                         "\xca\x34\x83\x27\x10\x5b\x68\x45"
+                         "\x8f\x52\x22\x0c\x55\x3d\x29\x7c"
+                         "\xe3\xc0\x66\x05\x42\x91\x5f\x58"
+                         "\xfe\x4a\x62\xd9\x8c\xa9\x04\x19"
+                         "\x04\xa9\x08\x4b\x57\xfc\x67\x53"
+                         "\x08\x7c\xbc\x66\x8a\xb0\xb6\x9f"
+                         "\x92\xd6\x41\x7c\x5b\x2a\x00\x79"
+                         "\x72",
+               .result = "\x3a\x92\xee\x53\x31\xaf\x2b\x60"
+                         "\x5f\x55\x8d\x00\x5d\xfc\x74\x97"
+                         "\x28\x54\xf4\xa5\x75\xf1\x9b\x25"
+                         "\x62\x1c\xc0\xe0\x13\xc8\x87\x53"
+                         "\xd0\xf3\xa7\x97\x1f\x3b\x1e\xea"
+                         "\xe0\xe5\x2a\xd1\xdd\xa4\x3b\x50"
+                         "\x45\xa3\x0d\x7e\x1b\xc9\xa0\xad"
+                         "\xb9\x2c\x54\xa6\xc7\x55\x16\xd0"
+                         "\xc5\x2e\x02\x44\x35\xd0\x7e\x67"
+                         "\xf2\xc4\x9b\xcd\x95\x10\xcc\x29"
+                         "\x4b\xfa\x86\x87\xbe\x40\x36\xbe"
+                         "\xe1\xa3\x52\x89\x55\x20\x9b\xc2"
+                         "\xab\xf2\x31\x34\x16\xad\xc8\x17"
+                         "\x65\x24\xc0\xff\x12\x37\xfe\x5a"
+                         "\x62\x3b\x59\x47\x6c\x5f\x3a\x8e"
+                         "\x3b\xd9\x30\xc8\x7f\x2f\x88\xda"
+                         "\x80\xfd\x02\xda\x7f\x9a\x7a\x73"
+                         "\x59\xc5\x34\x09\x9a\x11\xcb\xa7"
+                         "\xfc\xf6\xa1\xa0\x60\xfb\x43\xbb"
+                         "\xf1\xe9\xd7\xc6\x79\x27\x4e\xff"
+                         "\x22\xb4\x24\xbf\x76\xee\x47\xb9"
+                         "\x6d\x3f\x8b\xb0\x9c\x3c\x43\xdd"
+                         "\xff\x25\x2e\x6d\xa4\x2b\xfb\x5d"
+                         "\x1b\x97\x6c\x55\x0a\x82\x7a\x7b"
+                         "\x94\x34\xc2\xdb\x2f\x1f\xc1\xea"
+                         "\xd4\x4d\x17\x46\x3b\x51\x69\x09"
+                         "\xe4\x99\x32\x25\xfd\x94\xaf\xfb"
+                         "\x10\xf7\x4f\xdd\x0b\x3c\x8b\x41"
+                         "\xb3\x6a\xb7\xd1\x33\xa8\x0c\x2f"
+                         "\x62\x4c\x72\x11\xd7\x74\xe1\x3b"
+                         "\x38\x43\x66\x7b\x6c\x36\x48\xe7"
+                         "\xe3\xe7\x9d\xb9\x42\x73\x7a\x2a"
+                         "\x89\x20\x1a\x41\x80\x03\xf7\x8f"
+                         "\x61\x78\x13\xbf\xfe\x50\xf5\x04"
+                         "\x52\xf9\xac\x47\xf8\x62\x4b\xb2"
+                         "\x24\xa9\xbf\x64\xb0\x18\x69\xd2"
+                         "\xf5\xe4\xce\xc8\xb1\x87\x75\xd6"
+                         "\x2c\x24\x79\x00\x7d\x26\xfb\x44"
+                         "\xe7\x45\x7a\xee\x58\xa5\x83\xc1"
+                         "\xb4\x24\xab\x23\x2f\x4d\xd7\x4f"
+                         "\x1c\xc7\xaa\xa9\x50\xf4\xa3\x07"
+                         "\x12\x13\x89\x74\xdc\x31\x6a\xb2"
+                         "\xf5\x0f\x13\x8b\xb9\xdb\x85\x1f"
+                         "\xf5\xbc\x88\xd9\x95\xea\x31\x6c"
+                         "\x36\x60\xb6\x49\xdc\xc4\xf7\x55"
+                         "\x3f\x21\xc1\xb5\x92\x18\x5e\xbc"
+                         "\x9f\x87\x7f\xe7\x79\x25\x40\x33"
+                         "\xd6\xb9\x33\xd5\x50\xb3\xc7\x89"
+                         "\x1b\x12\xa0\x46\xdd\xa7\xd8\x3e"
+                         "\x71\xeb\x6f\x66\xa1\x26\x0c\x67"
+                         "\xab\xb2\x38\x58\x17\xd8\x44\x3b"
+                         "\x16\xf0\x8e\x62\x8d\x16\x10\x00"
+                         "\x32\x8b\xef\xb9\x28\xd3\xc5\xad"
+                         "\x0a\x19\xa2\xe4\x03\x27\x7d\x94"
+                         "\x06\x18\xcd\xd6\x27\x00\xf9\x1f"
+                         "\xb6\xb3\xfe\x96\x35\x5f\xc4\x1c"
+                         "\x07\x62\x10\x79\x68\x50\xf1\x7e"
+                         "\x29\xe7\xc4\xc4\xe7\xee\x54\xd6"
+                         "\x58\x76\x84\x6d\x8d\xe4\x59\x31"
+                         "\xe9\xf4\xdc\xa1\x1f\xe5\x1a\xd6"
+                         "\xe6\x64\x46\xf5\x77\x9c\x60\x7a"
+                         "\x5e\x62\xe3\x0a\xd4\x9f\x7a\x2d"
+                         "\x7a\xa5\x0a\x7b\x29\x86\x7a\x74"
+                         "\x74\x71\x6b\xca\x7d\x1d\xaa\xba"
+                         "\x39\x84\x43\x76\x35\xfe\x4f\x9b"
+                         "\xbb\xbb\xb5\x6a\x32\xb5\x5d\x41"
+                         "\x51\xf0\x5b\x68\x03\x47\x4b\x8a"
+                         "\xca\x88\xf6\x37\xbd\x73\x51\x70"
+                         "\x66\xfe\x9e\x5f\x21\x9c\xf3\xdd"
+                         "\xc3\xea\x27\xf9\x64\x94\xe1\x19"
+                         "\xa0\xa9\xab\x60\xe0\x0e\xf7\x78"
+                         "\x70\x86\xeb\xe0\xd1\x5c\x05\xd3"
+                         "\xd7\xca\xe0\xc0\x47\x47\x34\xee"
+                         "\x11\xa3\xa3\x54\x98\xb7\x49\x8e"
+                         "\x84\x28\x70\x2c\x9e\xfb\x55\x54"
+                         "\x4d\xf8\x86\xf7\x85\x7c\xbd\xf3"
+                         "\x17\xd8\x47\xcb\xac\xf4\x20\x85"
+                         "\x34\x66\xad\x37\x2d\x5e\x52\xda"
+                         "\x8a\xfe\x98\x55\x30\xe7\x2d\x2b"
+                         "\x19\x10\x8e\x7b\x66\x5e\xdc\xe0"
+                         "\x45\x1f\x7b\xb4\x08\xfb\x8f\xf6"
+                         "\x8c\x89\x21\x34\x55\x27\xb2\x76"
+                         "\xb2\x07\xd9\xd6\x68\x9b\xea\x6b"
+                         "\x2d\xb4\xc4\x35\xdd\xd2\x79\xae"
+                         "\xc7\xd6\x26\x7f\x12\x01\x8c\xa7"
+                         "\xe3\xdb\xa8\xf4\xf7\x2b\xec\x99"
+                         "\x11\x00\xf1\x35\x8c\xcf\xd5\xc9"
+                         "\xbd\x91\x36\x39\x70\xcf\x7d\x70"
+                         "\x47\x1a\xfc\x6b\x56\xe0\x3f\x9c"
+                         "\x60\x49\x01\x72\xa9\xaf\x2c\x9c"
+                         "\xe8\xab\xda\x8c\x14\x19\xf3\x75"
+                         "\x07\x17\x9d\x44\x67\x7a\x2e\xef"
+                         "\xb7\x83\x35\x4a\xd1\x3d\x1c\x84"
+                         "\x32\xdd\xaa\xea\xca\x1d\xdc\x72"
+                         "\x2c\xcc\x43\xcd\x5d\xe3\x21\xa4"
+                         "\xd0\x8a\x4b\x20\x12\xa3\xd5\x86"
+                         "\x76\x96\xff\x5f\x04\x57\x0f\xe6"
+                         "\xba\xe8\x76\x50\x0c\x64\x1d\x83"
+                         "\x9c\x9b\x9a\x9a\x58\x97\x9c\x5c"
+                         "\xb4\xa4\xa6\x3e\x19\xeb\x8f\x5a"
+                         "\x61\xb2\x03\x7b\x35\x19\xbe\xa7"
+                         "\x63\x0c\xfd\xdd\xf9\x90\x6c\x08"
+                         "\x19\x11\xd3\x65\x4a\xf5\x96\x92"
+                         "\x59\xaa\x9c\x61\x0c\x29\xa7\xf8"
+                         "\x14\x39\x37\xbf\x3c\xf2\x16\x72"
+                         "\x02\xfa\xa2\xf3\x18\x67\x5d\xcb"
+                         "\xdc\x4d\xbb\x96\xff\x70\x08\x2d"
+                         "\xc2\xa8\x52\xe1\x34\x5f\x72\xfe"
+                         "\x64\xbf\xca\xa7\x74\x38\xfb\x74"
+                         "\x55\x9c\xfa\x8a\xed\xfb\x98\xeb"
+                         "\x58\x2e\x6c\xe1\x52\x76\x86\xd7"
+                         "\xcf\xa1\xa4\xfc\xb2\x47\x41\x28"
+                         "\xa3\xc1\xe5\xfd\x53\x19\x28\x2b"
+                         "\x37\x04\x65\x96\x99\x7a\x28\x0f"
+                         "\x07\x68\x4b\xc7\x52\x0a\x55\x35"
+                         "\x40\x19\x95\x61\xe8\x59\x40\x1f"
+                         "\x9d\xbf\x78\x7d\x8f\x84\xff\x6f"
+                         "\xd0\xd5\x63\xd2\x22\xbd\xc8\x4e"
+                         "\xfb\xe7\x9f\x06\xe6\xe7\x39\x6d"
+                         "\x6a\x96\x9f\xf0\x74\x7e\xc9\x35"
+                         "\xb7\x26\xb8\x1c\x0a\xa6\x27\x2c"
+                         "\xa2\x2b\xfe\xbe\x0f\x07\x73\xae"
+                         "\x7f\x7f\x54\xf5\x7c\x6a\x0a\x56"
+                         "\x49\xd4\x81\xe5\x85\x53\x99\x1f"
+                         "\x95\x05\x13\x58\x8d\x0e\x1b\x90"
+                         "\xc3\x75\x48\x64\x58\x98\x67\x84"
+                         "\xae\xe2\x21\xa2\x8a\x04\x0a\x0b"
+                         "\x61\xaa\xb0\xd4\x28\x60\x7a\xf8"
+                         "\xbc\x52\xfb\x24\x7f\xed\x0d\x2a"
+                         "\x0a\xb2\xf9\xc6\x95\xb5\x11\xc9"
+                         "\xf4\x0f\x26\x11\xcf\x2a\x57\x87"
+                         "\x7a\xf3\xe7\x94\x65\xc2\xb5\xb3"
+                         "\xab\x98\xe3\xc1\x2b\x59\x19\x7c"
+                         "\xd6\xf3\xf9\xbf\xff\x6d\xc6\x82"
+                         "\x13\x2f\x4a\x2e\xcd\x26\xfe\x2d"
+                         "\x01\x70\xf4\xc2\x7f\x1f\x4c\xcb"
+                         "\x47\x77\x0c\xa0\xa3\x03\xec\xda"
+                         "\xa9\xbf\x0d\x2d\xae\xe4\xb8\x7b"
+                         "\xa9\xbc\x08\xb4\x68\x2e\xc5\x60"
+                         "\x8d\x87\x41\x2b\x0f\x69\xf0\xaf"
+                         "\x5f\xba\x72\x20\x0f\x33\xcd\x6d"
+                         "\x36\x7d\x7b\xd5\x05\xf1\x4b\x05"
+                         "\xc4\xfc\x7f\x80\xb9\x4d\xbd\xf7"
+                         "\x7c\x84\x07\x01\xc2\x40\x66\x5b"
+                         "\x98\xc7\x2c\xe3\x97\xfa\xdf\x87"
+                         "\xa0\x1f\xe9\x21\x42\x0f\x3b\xeb"
+                         "\x89\x1c\x3b\xca\x83\x61\x77\x68"
+                         "\x84\xbb\x60\x87\x38\x2e\x25\xd5"
+                         "\x9e\x04\x41\x70\xac\xda\xc0\x9c"
+                         "\x9c\x69\xea\x8d\x4e\x55\x2a\x29"
+                         "\xed\x05\x4b\x7b\x73\x71\x90\x59"
+                         "\x4d\xc8\xd8\x44\xf0\x4c\xe1\x5e"
+                         "\x84\x47\x55\xcc\x32\x3f\xe7\x97"
+                         "\x42\xc6\x32\xac\x40\xe5\xa5\xc7"
+                         "\x8b\xed\xdb\xf7\x83\xd6\xb1\xc2"
+                         "\x52\x5e\x34\xb7\xeb\x6e\xd9\xfc"
+                         "\xe5\x93\x9a\x97\x3e\xb0\xdc\xd9"
+                         "\xd7\x06\x10\xb6\x1d\x80\x59\xdd"
+                         "\x0d\xfe\x64\x35\xcd\x5d\xec\xf0"
+                         "\xba\xd0\x34\xc9\x2d\x91\xc5\x17"
+                         "\x11",
+               .ilen   = 1281,
+               .rlen   = 1281,
+               .also_non_np = 1,
+               .np     = 3,
+               .tap    = { 1200, 1, 80 },
+       },
+};
+
 /*
  * CTS (Cipher Text Stealing) mode tests
  */

diff --git a/include/crypto/chacha20.h b/include/crypto/chacha20.h
index fbec4e6a87890372411407dfe1a70ad1859301d3..6290d997060ecbd6900686e125feabfaadbc1b63 100644 (file)
--- a/include/crypto/chacha20.h
+++ b/include/crypto/chacha20.h
@@ -1,6 +1,10 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 /*
- * Common values for the ChaCha20 algorithm
+ * Common values and helper functions for the ChaCha20 and XChaCha20 algorithms.
+ *
+ * XChaCha20 extends ChaCha20's nonce to 192 bits, while provably retaining
+ * ChaCha20's security.  Here they share the same key size, tfm context, and
+ * setkey function; only their IV size and encrypt/decrypt function differ.
  */
 
 #ifndef _CRYPTO_CHACHA20_H
@@ -10,10 +14,15 @@
 #include <linux/types.h>
 #include <linux/crypto.h>
 
+/* 32-bit stream position, then 96-bit nonce (RFC7539 convention) */
 #define CHACHA20_IV_SIZE       16
+
 #define CHACHA20_KEY_SIZE      32
 #define CHACHA20_BLOCK_SIZE    64
 
+/* 192-bit nonce, then 64-bit stream position */
+#define XCHACHA20_IV_SIZE      32
+
 struct chacha20_ctx {
        u32 key[8];
 };
@@ -22,8 +31,11 @@ void chacha20_block(u32 *state, u8 *stream);
 void hchacha20_block(const u32 *in, u32 *out);
 
 void crypto_chacha20_init(u32 *state, struct chacha20_ctx *ctx, u8 *iv);
+
 int crypto_chacha20_setkey(struct crypto_skcipher *tfm, const u8 *key,
                           unsigned int keysize);
+
 int crypto_chacha20_crypt(struct skcipher_request *req);
+int crypto_xchacha20_crypt(struct skcipher_request *req);
 
 #endif