crypto: sha1 - export sha1_update for reuse

Export the update function as crypto_sha1_update() to not have the need
to reimplement the same algorithm for each SHA-1 implementation. This
way the generic SHA-1 implementation can be used as fallback for other
implementations that fail to run under certain circumstances, like the
need for an FPU context while executing in IRQ context.

Signed-off-by: Mathias Krause <minipli@googlemail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/crypto/sha1_generic.c b/crypto/sha1_generic.c
index 00ae60e..4279480 100644 (file)
--- a/crypto/sha1_generic.c
+++ b/crypto/sha1_generic.c
@@ -36,7 +36,7 @@ static int sha1_init(struct shash_desc *desc)
        return 0;
 }
 
-static int sha1_update(struct shash_desc *desc, const u8 *data,
+int crypto_sha1_update(struct shash_desc *desc, const u8 *data,
                        unsigned int len)
 {
        struct sha1_state *sctx = shash_desc_ctx(desc);
@@ -71,6 +71,7 @@ static int sha1_update(struct shash_desc *desc, const u8 *data,
 
        return 0;
 }
+EXPORT_SYMBOL(crypto_sha1_update);
 
 
 /* Add padding and return the message digest. */
@@ -87,10 +88,10 @@ static int sha1_final(struct shash_desc *desc, u8 *out)
        /* Pad out to 56 mod 64 */
        index = sctx->count & 0x3f;
        padlen = (index < 56) ? (56 - index) : ((64+56) - index);
-       sha1_update(desc, padding, padlen);
+       crypto_sha1_update(desc, padding, padlen);
 
        /* Append length */
-       sha1_update(desc, (const u8 *)&bits, sizeof(bits));
+       crypto_sha1_update(desc, (const u8 *)&bits, sizeof(bits));
 
        /* Store state in digest */
        for (i = 0; i < 5; i++)
@@ -121,7 +122,7 @@ static int sha1_import(struct shash_desc *desc, const void *in)
 static struct shash_alg alg = {
        .digestsize     =       SHA1_DIGEST_SIZE,
        .init           =       sha1_init,
-       .update         =       sha1_update,
+       .update         =       crypto_sha1_update,
        .final          =       sha1_final,
        .export         =       sha1_export,
        .import         =       sha1_import,

diff --git a/include/crypto/sha.h b/include/crypto/sha.h
index 069e85b..83e6be5 100644 (file)
--- a/include/crypto/sha.h
+++ b/include/crypto/sha.h
@@ -82,4 +82,7 @@ struct sha512_state {
        u8 buf[SHA512_BLOCK_SIZE];
 };
 
+extern int crypto_sha1_update(struct shash_desc *desc, const u8 *data,
+                             unsigned int len);
+
 #endif