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authorArd Biesheuvel <ard.biesheuvel@linaro.org>2015-04-09 12:55:36 +0200
committerHerbert Xu <herbert@gondor.apana.org.au>2015-04-10 21:39:40 +0800
commit7c71f0f760d65f270aca0849caebb1fd5d53c66b (patch)
treedad64c5f6a8469f047f6249463a78fae1999ab93 /crypto
parentb84a2a0b4ec214fc5d4ba1d3d5b26d4f88733dba (diff)
downloadkernel-7c71f0f760d65f270aca0849caebb1fd5d53c66b.tar.gz
crypto: sha1-generic - move to generic glue implementation
This updated 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. The import and export() functions and the .statesize member are dropped, since the default implementation is perfectly suitable for this module. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto')
-rw-r--r--crypto/sha1_generic.c102
1 files changed, 20 insertions, 82 deletions
diff --git a/crypto/sha1_generic.c b/crypto/sha1_generic.c
index a3e50c37eb6f..39e3acc438d9 100644
--- a/crypto/sha1_generic.c
+++ b/crypto/sha1_generic.c
@@ -23,111 +23,49 @@
#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(struct sha1_state *sst, u8 const *src,
+ int blocks)
{
- 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 },
- };
-
- return 0;
+ while (blocks--) {
+ sha_transform(sst->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)
+ 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);
}
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;
+ sha1_base_do_finalize(desc, sha1_generic_block_fn);
+ return sha1_base_finish(desc, out);
}
-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;
-}
-
-static int sha1_import(struct shash_desc *desc, const void *in)
-{
- struct sha1_state *sctx = shash_desc_ctx(desc);
-
- memcpy(sctx, in, sizeof(*sctx));
- return 0;
+ sha1_base_do_update(desc, data, len, sha1_generic_block_fn);
+ return sha1_final(desc, out);
}
+EXPORT_SYMBOL(crypto_sha1_finup);
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,
.descsize = sizeof(struct sha1_state),
- .statesize = sizeof(struct sha1_state),
.base = {
.cra_name = "sha1",
.cra_driver_name= "sha1-generic",