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>

2 files changed, 8 insertions, 4 deletions

diff --git a/crypto/sha1_generic.c b/crypto/sha1_generic.c
index 00ae60eb925..42794803c48 100644
--- 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 069e85ba97e..83e6be5e270 100644
--- 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