[CRYPTO] sha256-generic: Extend sha256_generic.c to support SHA-224

Resubmitting this patch which extends sha256_generic.c to support SHA-224 as
described in FIPS 180-2 and RFC 3874. HMAC-SHA-224 as described in RFC4231
is then supported through the hmac interface.

Patch includes test vectors for SHA-224 and HMAC-SHA-224.

SHA-224 chould be chosen as a hash algorithm when 112 bits of security
strength is required.

Patch generated against the 2.6.24-rc1 kernel and tested against
2.6.24-rc1-git14 which includes fix for scatter gather implementation for HMAC.

Signed-off-by: Jonathan Lynch <jonathan.lynch@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

4 files changed, 229 insertions, 12 deletions

diff --git a/crypto/Kconfig b/crypto/Kconfig
index cf115b14079e..7758454b9f17 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -91,7 +91,7 @@ config CRYPTO_SHA1
           SHA-1 secure hash standard (FIPS 180-1/DFIPS 180-2).
 
 config CRYPTO_SHA256
-        tristate "SHA256 digest algorithm"
+        tristate "SHA224 and SHA256 digest algorithm"
         select CRYPTO_ALGAPI
         help
           SHA256 secure hash standard (DFIPS 180-2).
@@ -99,6 +99,9 @@ config CRYPTO_SHA256
           This version of SHA implements a 256 bit hash with 128 bits of
           security against collision attacks.
 
+          This code also includes SHA-224, a 224 bit hash with 112 bits
+          of security against collision attacks.
+
 config CRYPTO_SHA512
         tristate "SHA384 and SHA512 digest algorithms"
         select CRYPTO_ALGAPI
diff --git a/crypto/sha256_generic.c b/crypto/sha256_generic.c
index fd3918be58b5..3cc93fd61043 100644
--- a/crypto/sha256_generic.c
+++ b/crypto/sha256_generic.c
@@ -9,6 +9,7 @@
  * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
  * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
  * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
+ * SHA224 Support Copyright 2007 Intel Corporation <jonathan.lynch@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
@@ -218,6 +219,22 @@ static void sha256_transform(u32 *state, const u8 *input)
         memset(W, 0, 64 * sizeof(u32));
 }
 
+
+static void sha224_init(struct crypto_tfm *tfm)
+{
+        struct sha256_ctx *sctx = crypto_tfm_ctx(tfm);
+        sctx->state[0] = SHA224_H0;
+        sctx->state[1] = SHA224_H1;
+        sctx->state[2] = SHA224_H2;
+        sctx->state[3] = SHA224_H3;
+        sctx->state[4] = SHA224_H4;
+        sctx->state[5] = SHA224_H5;
+        sctx->state[6] = SHA224_H6;
+        sctx->state[7] = SHA224_H7;
+        sctx->count[0] = 0;
+        sctx->count[1] = 0;
+}
+
 static void sha256_init(struct crypto_tfm *tfm)
 {
         struct sha256_ctx *sctx = crypto_tfm_ctx(tfm);
@@ -294,8 +311,17 @@ static void sha256_final(struct crypto_tfm *tfm, u8 *out)
         memset(sctx, 0, sizeof(*sctx));
 }
 
+static void sha224_final(struct crypto_tfm *tfm, u8 *hash)
+{
+        u8 D[SHA256_DIGEST_SIZE];
+
+        sha256_final(tfm, D);
+
+        memcpy(hash, D, SHA224_DIGEST_SIZE);
+        memset(D, 0, SHA256_DIGEST_SIZE);
+}
 
-static struct crypto_alg alg = {
+static struct crypto_alg sha256 = {
         .cra_name       =       "sha256",
         .cra_driver_name=       "sha256-generic",
         .cra_flags      =       CRYPTO_ALG_TYPE_DIGEST,
@@ -303,28 +329,58 @@ static struct crypto_alg alg = {
         .cra_ctxsize    =       sizeof(struct sha256_ctx),
         .cra_module     =       THIS_MODULE,
         .cra_alignmask  =       3,
-        .cra_list       =       LIST_HEAD_INIT(alg.cra_list),
+        .cra_list       =       LIST_HEAD_INIT(sha256.cra_list),
         .cra_u          =       { .digest = {
         .dia_digestsize =       SHA256_DIGEST_SIZE,
-        .dia_init       =       sha256_init,
-        .dia_update     =       sha256_update,
-        .dia_final      =       sha256_final } }
+        .dia_init       =       sha256_init,
+        .dia_update     =       sha256_update,
+        .dia_final      =       sha256_final } }
+};
+
+static struct crypto_alg sha224 = {
+        .cra_name       = "sha224",
+        .cra_driver_name = "sha224-generic",
+        .cra_flags      = CRYPTO_ALG_TYPE_DIGEST,
+        .cra_blocksize  = SHA224_BLOCK_SIZE,
+        .cra_ctxsize    = sizeof(struct sha256_ctx),
+        .cra_module     = THIS_MODULE,
+        .cra_alignmask  = 3,
+        .cra_list       = LIST_HEAD_INIT(sha224.cra_list),
+        .cra_u          = { .digest = {
+        .dia_digestsize = SHA224_DIGEST_SIZE,
+        .dia_init       = sha224_init,
+        .dia_update     = sha256_update,
+        .dia_final      = sha224_final } }
 };
 
 static int __init init(void)
 {
-        return crypto_register_alg(&alg);
+        int ret = 0;
+
+        ret = crypto_register_alg(&sha224);
+
+        if (ret < 0)
+                return ret;
+
+        ret = crypto_register_alg(&sha256);
+
+        if (ret < 0)
+                crypto_unregister_alg(&sha224);
+
+        return ret;
 }
 
 static void __exit fini(void)
 {
-        crypto_unregister_alg(&alg);
+        crypto_unregister_alg(&sha224);
+        crypto_unregister_alg(&sha256);
 }
 
 module_init(init);
 module_exit(fini);
 
 MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm");
+MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm");
 
+MODULE_ALIAS("sha224");
 MODULE_ALIAS("sha256");
diff --git a/crypto/tcrypt.c b/crypto/tcrypt.c
index aa84bc4f2313..4d364ccacbb2 100644
--- a/crypto/tcrypt.c
+++ b/crypto/tcrypt.c
@@ -12,6 +12,7 @@
  * Software Foundation; either version 2 of the License, or (at your option)
  * any later version.
  *
+ * 2007-11-06 Added SHA-224 and SHA-224-HMAC tests
  * 2006-12-07 Added SHA384 HMAC and SHA512 HMAC tests
  * 2004-08-09 Added cipher speed tests (Reyk Floeter <reyk@vantronix.net>)
  * 2003-09-14 Rewritten by Kartikey Mahendra Bhatt
@@ -74,8 +75,9 @@ static char *xbuf;
 static char *tvmem;
 
 static char *check[] = {
-        "des", "md5", "des3_ede", "rot13", "sha1", "sha256", "blowfish",
-        "twofish", "serpent", "sha384", "sha512", "md4", "aes", "cast6",
+        "des", "md5", "des3_ede", "rot13", "sha1", "sha224", "sha256",
+        "blowfish", "twofish", "serpent", "sha384", "sha512", "md4", "aes",
+        "cast6", "arc4", "michael_mic", "deflate", "crc32c", "tea", "xtea",
         "arc4", "michael_mic", "deflate", "crc32c", "tea", "xtea",
         "khazad", "wp512", "wp384", "wp256", "tnepres", "xeta",  "fcrypt",
         "camellia", "seed", NULL
@@ -918,6 +920,8 @@ static void do_test(void)
 
                 test_hash("md4", md4_tv_template, MD4_TEST_VECTORS);
 
+                test_hash("sha224", sha224_tv_template, SHA224_TEST_VECTORS);
+
                 test_hash("sha256", sha256_tv_template, SHA256_TEST_VECTORS);
 
                 //BLOWFISH
@@ -1067,6 +1071,8 @@ static void do_test(void)
                           HMAC_MD5_TEST_VECTORS);
                 test_hash("hmac(sha1)", hmac_sha1_tv_template,
                           HMAC_SHA1_TEST_VECTORS);
+                test_hash("hmac(sha224)", hmac_sha224_tv_template,
+                          HMAC_SHA224_TEST_VECTORS);
                 test_hash("hmac(sha256)", hmac_sha256_tv_template,
                           HMAC_SHA256_TEST_VECTORS);
                 test_hash("hmac(sha384)", hmac_sha384_tv_template,
@@ -1299,6 +1305,9 @@ static void do_test(void)
                             camellia_cbc_dec_tv_template,
                             CAMELLIA_CBC_DEC_TEST_VECTORS);
                 break;
+        case 33:
+                test_hash("sha224", sha224_tv_template, SHA224_TEST_VECTORS);
+                break;
 
         case 100:
                 test_hash("hmac(md5)", hmac_md5_tv_template,
@@ -1324,7 +1333,10 @@ static void do_test(void)
                 test_hash("hmac(sha512)", hmac_sha512_tv_template,
                           HMAC_SHA512_TEST_VECTORS);
                 break;
-
+        case 105:
+                test_hash("hmac(sha224)", hmac_sha224_tv_template,
+                          HMAC_SHA224_TEST_VECTORS);
+                break;
 
         case 200:
                 test_cipher_speed("ecb(aes)", ENCRYPT, sec, NULL, 0,
@@ -1459,6 +1471,10 @@ static void do_test(void)
                 test_hash_speed("tgr192", sec, generic_hash_speed_template);
                 if (mode > 300 && mode < 400) break;
 
+        case 313:
+                test_hash_speed("sha224", sec, generic_hash_speed_template);
+                if (mode > 300 && mode < 400) break;
+
         case 399:
                 break;
 
diff --git a/crypto/tcrypt.h b/crypto/tcrypt.h
index f7f9b2379270..b91585ea1362 100644
--- a/crypto/tcrypt.h
+++ b/crypto/tcrypt.h
@@ -173,6 +173,33 @@ static struct hash_testvec sha1_tv_template[] = {
         }
 };
 
+
+/*
+ * SHA224 test vectors from from FIPS PUB 180-2
+ */
+#define SHA224_TEST_VECTORS     2
+
+static struct hash_testvec sha224_tv_template[] = {
+        {
+                .plaintext = "abc",
+                .psize  = 3,
+                .digest = { 0x23, 0x09, 0x7D, 0x22, 0x34, 0x05, 0xD8, 0x22,
+                        0x86, 0x42, 0xA4, 0x77, 0xBD, 0xA2, 0x55, 0xB3,
+                        0x2A, 0xAD, 0xBC, 0xE4, 0xBD, 0xA0, 0xB3, 0xF7,
+                        0xE3, 0x6C, 0x9D, 0xA7},
+        }, {
+                .plaintext =
+                "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq",
+                .psize  = 56,
+                .digest = { 0x75, 0x38, 0x8B, 0x16, 0x51, 0x27, 0x76, 0xCC,
+                        0x5D, 0xBA, 0x5D, 0xA1, 0xFD, 0x89, 0x01, 0x50,
+                        0xB0, 0xC6, 0x45, 0x5C, 0xB4, 0xF5, 0x8B, 0x19,
+                        0x52, 0x52, 0x25, 0x25 },
+                .np     = 2,
+                .tap    = { 28, 28 }
+        }
+};
+
 /*
  * SHA256 test vectors from from NIST
  */
@@ -817,6 +844,121 @@ static struct hash_testvec hmac_sha1_tv_template[] = {
         },
 };
 
+
+/*
+ * SHA224 HMAC test vectors from RFC4231
+ */
+#define HMAC_SHA224_TEST_VECTORS    4
+
+static struct hash_testvec hmac_sha224_tv_template[] = {
+        {
+                .key    = { 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b,
+                        0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b,
+                        0x0b, 0x0b, 0x0b, 0x0b },
+                .ksize  = 20,
+                /*  ("Hi There") */
+                .plaintext = { 0x48, 0x69, 0x20, 0x54, 0x68, 0x65, 0x72, 0x65 },
+                .psize  = 8,
+                .digest = { 0x89, 0x6f, 0xb1, 0x12, 0x8a, 0xbb, 0xdf, 0x19,
+                        0x68, 0x32, 0x10, 0x7c, 0xd4, 0x9d, 0xf3, 0x3f,
+                        0x47, 0xb4, 0xb1, 0x16, 0x99, 0x12, 0xba, 0x4f,
+                        0x53, 0x68, 0x4b, 0x22},
+        }, {
+                .key    = { 0x4a, 0x65, 0x66, 0x65 }, /* ("Jefe") */
+                .ksize  = 4,
+                /* ("what do ya want for nothing?") */
+                .plaintext = { 0x77, 0x68, 0x61, 0x74, 0x20, 0x64, 0x6f, 0x20,
+                        0x79, 0x61, 0x20, 0x77, 0x61, 0x6e, 0x74, 0x20,
+                        0x66, 0x6f, 0x72, 0x20, 0x6e, 0x6f, 0x74, 0x68,
+                        0x69, 0x6e, 0x67, 0x3f },
+                .psize  = 28,
+                .digest = { 0xa3, 0x0e, 0x01, 0x09, 0x8b, 0xc6, 0xdb, 0xbf,
+                        0x45, 0x69, 0x0f, 0x3a, 0x7e, 0x9e, 0x6d, 0x0f,
+                        0x8b, 0xbe, 0xa2, 0xa3, 0x9e, 0x61, 0x48, 0x00,
+                        0x8f, 0xd0, 0x5e, 0x44 },
+                .np = 4,
+                .tap    = { 7, 7, 7, 7 }
+        }, {
+                .key    = { 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+                        0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+                        0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+                        0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+                        0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+                        0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+                        0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+                        0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+                        0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+                        0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+                        0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+                        0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+                        0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+                        0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+                        0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+                        0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+                        0xaa, 0xaa, 0xaa },
+                .ksize  = 131,
+                /* ("Test Using Larger Than Block-Size Key - Hash Key First") */
+                .plaintext = { 0x54, 0x65, 0x73, 0x74, 0x20, 0x55, 0x73, 0x69,
+                        0x6e, 0x67, 0x20, 0x4c, 0x61, 0x72, 0x67, 0x65,
+                        0x72, 0x20, 0x54, 0x68, 0x61, 0x6e, 0x20, 0x42,
+                        0x6c, 0x6f, 0x63, 0x6b, 0x2d, 0x53, 0x69, 0x7a,
+                        0x65, 0x20, 0x4b, 0x65, 0x79, 0x20, 0x2d, 0x20,
+                        0x48, 0x61, 0x73, 0x68, 0x20, 0x4b, 0x65, 0x79,
+                        0x20, 0x46, 0x69, 0x72, 0x73, 0x74 },
+                .psize  = 54,
+                .digest = { 0x95, 0xe9, 0xa0, 0xdb, 0x96, 0x20, 0x95, 0xad,
+                        0xae, 0xbe, 0x9b, 0x2d, 0x6f, 0x0d, 0xbc, 0xe2,
+                        0xd4, 0x99, 0xf1, 0x12, 0xf2, 0xd2, 0xb7, 0x27,
+                        0x3f, 0xa6, 0x87, 0x0e },
+        }, {
+                .key    = { 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+                        0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+                        0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+                        0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+                        0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+                        0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+                        0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+                        0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+                        0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+                        0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+                        0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+                        0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+                        0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+                        0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+                        0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+                        0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+                        0xaa, 0xaa, 0xaa },
+                .ksize  = 131,
+                /* ("This is a test using a larger than block-size key and a")
+                (" larger than block-size data. The key needs to be")
+                        (" hashed before being used by the HMAC algorithm.") */
+                .plaintext = { 0x54, 0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20,
+                        0x61, 0x20, 0x74, 0x65, 0x73, 0x74, 0x20, 0x75,
+                        0x73, 0x69, 0x6e, 0x67, 0x20, 0x61, 0x20, 0x6c,
+                        0x61, 0x72, 0x67, 0x65, 0x72, 0x20, 0x74, 0x68,
+                        0x61, 0x6e, 0x20, 0x62, 0x6c, 0x6f, 0x63, 0x6b,
+                        0x2d, 0x73, 0x69, 0x7a, 0x65, 0x20, 0x6b, 0x65,
+                        0x79, 0x20, 0x61, 0x6e, 0x64, 0x20, 0x61, 0x20,
+                        0x6c, 0x61, 0x72, 0x67, 0x65, 0x72, 0x20, 0x74,
+                        0x68, 0x61, 0x6e, 0x20, 0x62, 0x6c, 0x6f, 0x63,
+                        0x6b, 0x2d, 0x73, 0x69, 0x7a, 0x65, 0x20, 0x64,
+                        0x61, 0x74, 0x61, 0x2e, 0x20, 0x54, 0x68, 0x65,
+                        0x20, 0x6b, 0x65, 0x79, 0x20, 0x6e, 0x65, 0x65,
+                        0x64, 0x73, 0x20, 0x74, 0x6f, 0x20, 0x62, 0x65,
+                        0x20, 0x68, 0x61, 0x73, 0x68, 0x65, 0x64, 0x20,
+                        0x62, 0x65, 0x66, 0x6f, 0x72, 0x65, 0x20, 0x62,
+                        0x65, 0x69, 0x6e, 0x67, 0x20, 0x75, 0x73, 0x65,
+                        0x64, 0x20, 0x62, 0x79, 0x20, 0x74, 0x68, 0x65,
+                        0x20, 0x48, 0x4d, 0x41, 0x43, 0x20, 0x61, 0x6c,
+                        0x67, 0x6f, 0x72, 0x69, 0x74, 0x68, 0x6d, 0x2e },
+                .psize  = 152,
+                .digest = { 0x3a, 0x85, 0x41, 0x66, 0xac, 0x5d, 0x9f, 0x02,
+                        0x3f, 0x54, 0xd5, 0x17, 0xd0, 0xb3, 0x9d, 0xbd,
+                        0x94, 0x67, 0x70, 0xdb, 0x9c, 0x2b, 0x95, 0xc9,
+                        0xf6, 0xf5, 0x65, 0xd1 },
+        },
+};
+
 /*
  * HMAC-SHA256 test vectors from
  * draft-ietf-ipsec-ciph-sha-256-01.txt