This updates the generic SHA-1 implementation to use the generic
shared SHA-1 glue code.
It also implements a .finup hook crypto_sha1_finup() and exports
it to other modules.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
---
crypto/sha1_generic.c | 108 +++++++++++++-------------------------------------
include/crypto/sha.h | 3 ++
2 files changed, 31 insertions(+), 80 deletions(-)
diff --git a/crypto/sha1_generic.c b/crypto/sha1_generic.c
index a3e50c37eb6f..322a2278d939 100644
--- a/crypto/sha1_generic.c
+++ b/crypto/sha1_generic.c
@@ -23,109 +23,57 @@
#include <linux/cryptohash.h>
#include <linux/types.h>
#include <crypto/sha.h>
+#include <crypto/sha1_base.h>
#include <asm/byteorder.h>
-static int sha1_init(struct shash_desc *desc)
+static void sha1_generic_block_fn(int blocks, u8 const *src, u32 *state,
+ const u8 *head, void *p)
{
- struct sha1_state *sctx = shash_desc_ctx(desc);
+ u32 temp[SHA_WORKSPACE_WORDS];
- *sctx = (struct sha1_state){
- .state = { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 },
- };
+ if (head)
+ sha_transform(state, head, temp);
- return 0;
+ while (blocks--) {
+ sha_transform(state, src, temp);
+ src += SHA1_BLOCK_SIZE;
+ }
+ memzero_explicit(temp, sizeof(temp));
}
int crypto_sha1_update(struct shash_desc *desc, const u8 *data,
unsigned int len)
{
- struct sha1_state *sctx = shash_desc_ctx(desc);
- unsigned int partial, done;
- const u8 *src;
-
- partial = sctx->count % SHA1_BLOCK_SIZE;
- sctx->count += len;
- done = 0;
- src = data;
-
- if ((partial + len) >= SHA1_BLOCK_SIZE) {
- u32 temp[SHA_WORKSPACE_WORDS];
-
- if (partial) {
- done = -partial;
- memcpy(sctx->buffer + partial, data,
- done + SHA1_BLOCK_SIZE);
- src = sctx->buffer;
- }
-
- do {
- sha_transform(sctx->state, src, temp);
- done += SHA1_BLOCK_SIZE;
- src = data + done;
- } while (done + SHA1_BLOCK_SIZE <= len);
-
- memzero_explicit(temp, sizeof(temp));
- partial = 0;
- }
- memcpy(sctx->buffer + partial, src, len - done);
-
- return 0;
+ return sha1_base_do_update(desc, data, len, sha1_generic_block_fn,
+ NULL);
}
EXPORT_SYMBOL(crypto_sha1_update);
-
-/* Add padding and return the message digest. */
-static int sha1_final(struct shash_desc *desc, u8 *out)
-{
- struct sha1_state *sctx = shash_desc_ctx(desc);
- __be32 *dst = (__be32 *)out;
- u32 i, index, padlen;
- __be64 bits;
- static const u8 padding[64] = { 0x80, };
-
- bits = cpu_to_be64(sctx->count << 3);
-
- /* Pad out to 56 mod 64 */
- index = sctx->count & 0x3f;
- padlen = (index < 56) ? (56 - index) : ((64+56) - index);
- crypto_sha1_update(desc, padding, padlen);
-
- /* Append length */
- crypto_sha1_update(desc, (const u8 *)&bits, sizeof(bits));
-
- /* 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);
-
- return 0;
-}
-
-static int sha1_export(struct shash_desc *desc, void *out)
+int crypto_sha1_finup(struct shash_desc *desc, const u8 *data,
+ unsigned int len, u8 *out)
{
- struct sha1_state *sctx = shash_desc_ctx(desc);
-
- memcpy(out, sctx, sizeof(*sctx));
- return 0;
+ if (len)
+ sha1_base_do_update(desc, data, len, sha1_generic_block_fn,
+ NULL);
+ sha1_base_do_finalize(desc, sha1_generic_block_fn, NULL);
+ return sha1_base_finish(desc, out);
}
+EXPORT_SYMBOL(crypto_sha1_finup);
-static int sha1_import(struct shash_desc *desc, const void *in)
+/* Add padding and return the message digest. */
+static int sha1_final(struct shash_desc *desc, u8 *out)
{
- struct sha1_state *sctx = shash_desc_ctx(desc);
-
- memcpy(sctx, in, sizeof(*sctx));
- return 0;
+ return crypto_sha1_finup(desc, NULL, 0, out);
}
static struct shash_alg alg = {
.digestsize = SHA1_DIGEST_SIZE,
- .init = sha1_init,
+ .init = sha1_base_init,
.update = crypto_sha1_update,
.final = sha1_final,
- .export = sha1_export,
- .import = sha1_import,
+ .finup = crypto_sha1_finup,
+ .export = sha1_base_export,
+ .import = sha1_base_import,
.descsize = sizeof(struct sha1_state),
.statesize = sizeof(struct sha1_state),
.base = {
diff --git a/include/crypto/sha.h b/include/crypto/sha.h
index 190f8a0e0242..10e2009f5464 100644
--- a/include/crypto/sha.h
+++ b/include/crypto/sha.h
@@ -87,6 +87,9 @@ struct shash_desc;
extern int crypto_sha1_update(struct shash_desc *desc, const u8 *data,
unsigned int len);
+extern int crypto_sha1_finup(struct shash_desc *desc, const u8 *data,
+ unsigned int len, u8 *hash);
+
extern int crypto_sha256_update(struct shash_desc *desc, const u8 *data,
unsigned int len);
--
1.8.3.2
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