crypto: x86/sha1_ssse3 - move SHA-1 SSSE3 implementation to base layer

This removes all the boilerplate from the existing implementation,
and replaces it with calls into the base layer.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 28 insertions, 111 deletions

diff --git a/arch/x86/crypto/sha1_ssse3_glue.c b/arch/x86/crypto/sha1_ssse3_glue.c
index 6c20fe04a738..33d1b9dc14cc 100644
--- a/arch/x86/crypto/sha1_ssse3_glue.c
+++ b/arch/x86/crypto/sha1_ssse3_glue.c
@@ -28,7 +28,7 @@
 #include <linux/cryptohash.h>
 #include <linux/types.h>
 #include <crypto/sha.h>
-#include <asm/byteorder.h>
+#include <crypto/sha1_base.h>
 #include <asm/i387.h>
 #include <asm/xcr.h>
 #include <asm/xsave.h>
@@ -44,132 +44,51 @@ asmlinkage void sha1_transform_avx(u32 *digest, const char *data,
 #define SHA1_AVX2_BLOCK_OPTSIZE 4       /* optimal 4*64 bytes of SHA1 blocks */
 
 asmlinkage void sha1_transform_avx2(u32 *digest, const char *data,
-                                unsigned int rounds);
+                                    unsigned int rounds);
 #endif
 
-static asmlinkage void (*sha1_transform_asm)(u32 *, const char *, unsigned int);
-
-
-static int sha1_ssse3_init(struct shash_desc *desc)
-{
-        struct sha1_state *sctx = shash_desc_ctx(desc);
-
-        *sctx = (struct sha1_state){
-                .state = { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 },
-        };
-
-        return 0;
-}
-
-static int __sha1_ssse3_update(struct shash_desc *desc, const u8 *data,
-                               unsigned int len, unsigned int partial)
-{
-        struct sha1_state *sctx = shash_desc_ctx(desc);
-        unsigned int done = 0;
-
-        sctx->count += len;
-
-        if (partial) {
-                done = SHA1_BLOCK_SIZE - partial;
-                memcpy(sctx->buffer + partial, data, done);
-                sha1_transform_asm(sctx->state, sctx->buffer, 1);
-        }
-
-        if (len - done >= SHA1_BLOCK_SIZE) {
-                const unsigned int rounds = (len - done) / SHA1_BLOCK_SIZE;
-
-                sha1_transform_asm(sctx->state, data + done, rounds);
-                done += rounds * SHA1_BLOCK_SIZE;
-        }
-
-        memcpy(sctx->buffer, data + done, len - done);
-
-        return 0;
-}
+static void (*sha1_transform_asm)(u32 *, const char *, unsigned int);
 
 static int sha1_ssse3_update(struct shash_desc *desc, const u8 *data,
                              unsigned int len)
 {
         struct sha1_state *sctx = shash_desc_ctx(desc);
-        unsigned int partial = sctx->count % SHA1_BLOCK_SIZE;
-        int res;
 
-        /* Handle the fast case right here */
-        if (partial + len < SHA1_BLOCK_SIZE) {
-                sctx->count += len;
-                memcpy(sctx->buffer + partial, data, len);
+        if (!irq_fpu_usable() ||
+            (sctx->count % SHA1_BLOCK_SIZE) + len < SHA1_BLOCK_SIZE)
+                return crypto_sha1_update(desc, data, len);
 
-                return 0;
-        }
+        /* make sure casting to sha1_block_fn() is safe */
+        BUILD_BUG_ON(offsetof(struct sha1_state, state) != 0);
 
-        if (!irq_fpu_usable()) {
-                res = crypto_sha1_update(desc, data, len);
-        } else {
-                kernel_fpu_begin();
-                res = __sha1_ssse3_update(desc, data, len, partial);
-                kernel_fpu_end();
-        }
-
-        return res;
-}
-
-
-/* Add padding and return the message digest. */
-static int sha1_ssse3_final(struct shash_desc *desc, u8 *out)
-{
-        struct sha1_state *sctx = shash_desc_ctx(desc);
-        unsigned int i, index, padlen;
-        __be32 *dst = (__be32 *)out;
-        __be64 bits;
-        static const u8 padding[SHA1_BLOCK_SIZE] = { 0x80, };
-
-        bits = cpu_to_be64(sctx->count << 3);
-
-        /* Pad out to 56 mod 64 and append length */
-        index = sctx->count % SHA1_BLOCK_SIZE;
-        padlen = (index < 56) ? (56 - index) : ((SHA1_BLOCK_SIZE+56) - index);
-        if (!irq_fpu_usable()) {
-                crypto_sha1_update(desc, padding, padlen);
-                crypto_sha1_update(desc, (const u8 *)&bits, sizeof(bits));
-        } else {
-                kernel_fpu_begin();
-                /* We need to fill a whole block for __sha1_ssse3_update() */
-                if (padlen <= 56) {
-                        sctx->count += padlen;
-                        memcpy(sctx->buffer + index, padding, padlen);
-                } else {
-                        __sha1_ssse3_update(desc, padding, padlen, index);
-                }
-                __sha1_ssse3_update(desc, (const u8 *)&bits, sizeof(bits), 56);
-                kernel_fpu_end();
-        }
-
-        /* Store state in digest */
-        for (i = 0; i < 5; i++)
-                dst[i] = cpu_to_be32(sctx->state[i]);
-
-        /* Wipe context */
-        memset(sctx, 0, sizeof(*sctx));
+        kernel_fpu_begin();
+        sha1_base_do_update(desc, data, len,
+                            (sha1_block_fn *)sha1_transform_asm);
+        kernel_fpu_end();
 
         return 0;
 }
 
-static int sha1_ssse3_export(struct shash_desc *desc, void *out)
+static int sha1_ssse3_finup(struct shash_desc *desc, const u8 *data,
+                              unsigned int len, u8 *out)
 {
-        struct sha1_state *sctx = shash_desc_ctx(desc);
+        if (!irq_fpu_usable())
+                return crypto_sha1_finup(desc, data, len, out);
 
-        memcpy(out, sctx, sizeof(*sctx));
+        kernel_fpu_begin();
+        if (len)
+                sha1_base_do_update(desc, data, len,
+                                    (sha1_block_fn *)sha1_transform_asm);
+        sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_transform_asm);
+        kernel_fpu_end();
 
-        return 0;
+        return sha1_base_finish(desc, out);
 }
 
-static int sha1_ssse3_import(struct shash_desc *desc, const void *in)
+/* Add padding and return the message digest. */
+static int sha1_ssse3_final(struct shash_desc *desc, u8 *out)
 {
-        struct sha1_state *sctx = shash_desc_ctx(desc);
-
-        memcpy(sctx, in, sizeof(*sctx));
-
-        return 0;
+        return sha1_ssse3_finup(desc, NULL, 0, out);
 }
 
 #ifdef CONFIG_AS_AVX2
@@ -186,13 +105,11 @@ static void sha1_apply_transform_avx2(u32 *digest, const char *data,
 
 static struct shash_alg alg = {
         .digestsize     =       SHA1_DIGEST_SIZE,
-        .init           =       sha1_ssse3_init,
+        .init           =       sha1_base_init,
         .update         =       sha1_ssse3_update,
         .final          =       sha1_ssse3_final,
-        .export         =       sha1_ssse3_export,
-        .import         =       sha1_ssse3_import,
+        .finup          =       sha1_ssse3_finup,
         .descsize       =       sizeof(struct sha1_state),
-        .statesize      =       sizeof(struct sha1_state),
         .base           =       {
                 .cra_name       =       "sha1",
                 .cra_driver_name=       "sha1-ssse3",