crypto: sha256_ssse3 - add sha224 support

Add sha224 implementation to sha256_ssse3 module.

This also fixes sha256_ssse3 module autoloading issue when 'sha224' is used
before 'sha256'. Previously in such case, just sha256_generic was loaded and
not sha256_ssse3 (since it did not provide sha224). Now if 'sha256' was used
after 'sha224' usage, sha256_ssse3 would remain unloaded.

Cc: Tim Chen <tim.c.chen@linux.intel.com>
Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 52 insertions, 5 deletions

diff --git a/arch/x86/crypto/sha256_ssse3_glue.c b/arch/x86/crypto/sha256_ssse3_glue.c
index 597d4da69656..50226c4b86ed 100644
--- a/arch/x86/crypto/sha256_ssse3_glue.c
+++ b/arch/x86/crypto/sha256_ssse3_glue.c
@@ -187,7 +187,36 @@ static int sha256_ssse3_import(struct shash_desc *desc, const void *in)
         return 0;
 }
 
-static struct shash_alg alg = {
+static int sha224_ssse3_init(struct shash_desc *desc)
+{
+        struct sha256_state *sctx = shash_desc_ctx(desc);
+
+        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;
+
+        return 0;
+}
+
+static int sha224_ssse3_final(struct shash_desc *desc, u8 *hash)
+{
+        u8 D[SHA256_DIGEST_SIZE];
+
+        sha256_ssse3_final(desc, D);
+
+        memcpy(hash, D, SHA224_DIGEST_SIZE);
+        memset(D, 0, SHA256_DIGEST_SIZE);
+
+        return 0;
+}
+
+static struct shash_alg algs[] = { {
         .digestsize     =       SHA256_DIGEST_SIZE,
         .init           =       sha256_ssse3_init,
         .update         =       sha256_ssse3_update,
@@ -204,7 +233,24 @@ static struct shash_alg alg = {
                 .cra_blocksize  =       SHA256_BLOCK_SIZE,
                 .cra_module     =       THIS_MODULE,
         }
-};
+}, {
+        .digestsize     =       SHA224_DIGEST_SIZE,
+        .init           =       sha224_ssse3_init,
+        .update         =       sha256_ssse3_update,
+        .final          =       sha224_ssse3_final,
+        .export         =       sha256_ssse3_export,
+        .import         =       sha256_ssse3_import,
+        .descsize       =       sizeof(struct sha256_state),
+        .statesize      =       sizeof(struct sha256_state),
+        .base           =       {
+                .cra_name       =       "sha224",
+                .cra_driver_name =      "sha224-ssse3",
+                .cra_priority   =       150,
+                .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
+                .cra_blocksize  =       SHA224_BLOCK_SIZE,
+                .cra_module     =       THIS_MODULE,
+        }
+} };
 
 #ifdef CONFIG_AS_AVX
 static bool __init avx_usable(void)
@@ -227,7 +273,7 @@ static bool __init avx_usable(void)
 
 static int __init sha256_ssse3_mod_init(void)
 {
-        /* test for SSE3 first */
+        /* test for SSSE3 first */
         if (cpu_has_ssse3)
                 sha256_transform_asm = sha256_transform_ssse3;
 
@@ -254,7 +300,7 @@ static int __init sha256_ssse3_mod_init(void)
                 else
 #endif
                         pr_info("Using SSSE3 optimized SHA-256 implementation\n");
-                return crypto_register_shash(&alg);
+                return crypto_register_shashes(algs, ARRAY_SIZE(algs));
         }
         pr_info("Neither AVX nor SSSE3 is available/usable.\n");
 
@@ -263,7 +309,7 @@ static int __init sha256_ssse3_mod_init(void)
 
 static void __exit sha256_ssse3_mod_fini(void)
 {
-        crypto_unregister_shash(&alg);
+        crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
 }
 
 module_init(sha256_ssse3_mod_init);
@@ -273,3 +319,4 @@ MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm, Supplemental SSE3 accelerated");
 
 MODULE_ALIAS("sha256");
+MODULE_ALIAS("sha384");