crypto: sha512_ssse3 - add sha384 support

Add sha384 implementation to sha512_ssse3 module.

This also fixes sha512_ssse3 module autoloading issue when 'sha384' is used
before 'sha512'. Previously in such case, just sha512_generic was loaded and
not sha512_ssse3 (since it did not provide sha384). Now if 'sha512' was used
after 'sha384' usage, sha512_ssse3 would remain unloaded. For example, this
happens with tcrypt testing module since it tests 'sha384' before 'sha512'.

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, 53 insertions, 5 deletions

diff --git a/arch/x86/crypto/sha512_ssse3_glue.c b/arch/x86/crypto/sha512_ssse3_glue.c
index 6cbd8df348d2..f30cd10293f0 100644
--- a/arch/x86/crypto/sha512_ssse3_glue.c
+++ b/arch/x86/crypto/sha512_ssse3_glue.c
@@ -194,7 +194,37 @@ static int sha512_ssse3_import(struct shash_desc *desc, const void *in)
         return 0;
 }
 
-static struct shash_alg alg = {
+static int sha384_ssse3_init(struct shash_desc *desc)
+{
+        struct sha512_state *sctx = shash_desc_ctx(desc);
+
+        sctx->state[0] = SHA384_H0;
+        sctx->state[1] = SHA384_H1;
+        sctx->state[2] = SHA384_H2;
+        sctx->state[3] = SHA384_H3;
+        sctx->state[4] = SHA384_H4;
+        sctx->state[5] = SHA384_H5;
+        sctx->state[6] = SHA384_H6;
+        sctx->state[7] = SHA384_H7;
+
+        sctx->count[0] = sctx->count[1] = 0;
+
+        return 0;
+}
+
+static int sha384_ssse3_final(struct shash_desc *desc, u8 *hash)
+{
+        u8 D[SHA512_DIGEST_SIZE];
+
+        sha512_ssse3_final(desc, D);
+
+        memcpy(hash, D, SHA384_DIGEST_SIZE);
+        memset(D, 0, SHA512_DIGEST_SIZE);
+
+        return 0;
+}
+
+static struct shash_alg algs[] = { {
         .digestsize     =       SHA512_DIGEST_SIZE,
         .init           =       sha512_ssse3_init,
         .update         =       sha512_ssse3_update,
@@ -211,7 +241,24 @@ static struct shash_alg alg = {
                 .cra_blocksize  =       SHA512_BLOCK_SIZE,
                 .cra_module     =       THIS_MODULE,
         }
-};
+},  {
+        .digestsize     =       SHA384_DIGEST_SIZE,
+        .init           =       sha384_ssse3_init,
+        .update         =       sha512_ssse3_update,
+        .final          =       sha384_ssse3_final,
+        .export         =       sha512_ssse3_export,
+        .import         =       sha512_ssse3_import,
+        .descsize       =       sizeof(struct sha512_state),
+        .statesize      =       sizeof(struct sha512_state),
+        .base           =       {
+                .cra_name       =       "sha384",
+                .cra_driver_name =      "sha384-ssse3",
+                .cra_priority   =       150,
+                .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
+                .cra_blocksize  =       SHA384_BLOCK_SIZE,
+                .cra_module     =       THIS_MODULE,
+        }
+} };
 
 #ifdef CONFIG_AS_AVX
 static bool __init avx_usable(void)
@@ -234,7 +281,7 @@ static bool __init avx_usable(void)
 
 static int __init sha512_ssse3_mod_init(void)
 {
-        /* test for SSE3 first */
+        /* test for SSSE3 first */
         if (cpu_has_ssse3)
                 sha512_transform_asm = sha512_transform_ssse3;
 
@@ -261,7 +308,7 @@ static int __init sha512_ssse3_mod_init(void)
                 else
 #endif
                         pr_info("Using SSSE3 optimized SHA-512 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");
 
@@ -270,7 +317,7 @@ static int __init sha512_ssse3_mod_init(void)
 
 static void __exit sha512_ssse3_mod_fini(void)
 {
-        crypto_unregister_shash(&alg);
+        crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
 }
 
 module_init(sha512_ssse3_mod_init);
@@ -280,3 +327,4 @@ MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("SHA512 Secure Hash Algorithm, Supplemental SSE3 accelerated");
 
 MODULE_ALIAS("sha512");
+MODULE_ALIAS("sha384");