[PATCH v2 05/14] crypto: sha256-generic: move to generic glue implementation
Ard Biesheuvel
ard.biesheuvel at linaro.org
Mon Mar 30 02:36:19 PDT 2015
This updates the generic SHA-256 implementation to use the
new shared SHA-256 glue code.
It also implements a .finup hook crypto_sha256_finup() and exports
it to other modules.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel at linaro.org>
---
crypto/Kconfig | 1 +
crypto/sha256_generic.c | 139 ++++++++++--------------------------------------
include/crypto/sha.h | 3 ++
3 files changed, 31 insertions(+), 112 deletions(-)
diff --git a/crypto/Kconfig b/crypto/Kconfig
index 83bc1680391a..72bf5af7240d 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -611,6 +611,7 @@ config CRYPTO_SHA256_BASE
config CRYPTO_SHA256
tristate "SHA224 and SHA256 digest algorithm"
+ select CRYPTO_SHA256_BASE
select CRYPTO_HASH
help
SHA256 secure hash standard (DFIPS 180-2).
diff --git a/crypto/sha256_generic.c b/crypto/sha256_generic.c
index b001ff5c2efc..d5c18c08b3da 100644
--- a/crypto/sha256_generic.c
+++ b/crypto/sha256_generic.c
@@ -214,136 +214,50 @@ static void sha256_transform(u32 *state, const u8 *input)
memzero_explicit(W, 64 * sizeof(u32));
}
-static int sha224_init(struct shash_desc *desc)
+static void sha256_generic_block_fn(int blocks, u8 const *src, u32 *state,
+ const u8 *head, void *p)
{
- struct sha256_state *sctx = shash_desc_ctx(desc);
- sctx->state[0] = SHA224_H0;
- sctx->state[1] = SHA224_H1;
- sctx->state[2] = SHA224_H2;
- sctx->state[3] = SHA224_H3;
- sctx->state[4] = SHA224_H4;
- sctx->state[5] = SHA224_H5;
- sctx->state[6] = SHA224_H6;
- sctx->state[7] = SHA224_H7;
- sctx->count = 0;
+ if (head)
+ sha256_transform(state, head);
- return 0;
-}
-
-static int sha256_init(struct shash_desc *desc)
-{
- struct sha256_state *sctx = shash_desc_ctx(desc);
- sctx->state[0] = SHA256_H0;
- sctx->state[1] = SHA256_H1;
- sctx->state[2] = SHA256_H2;
- sctx->state[3] = SHA256_H3;
- sctx->state[4] = SHA256_H4;
- sctx->state[5] = SHA256_H5;
- sctx->state[6] = SHA256_H6;
- sctx->state[7] = SHA256_H7;
- sctx->count = 0;
-
- return 0;
+ while (blocks--) {
+ sha256_transform(state, src);
+ src += SHA256_BLOCK_SIZE;
+ }
}
int crypto_sha256_update(struct shash_desc *desc, const u8 *data,
unsigned int len)
{
- struct sha256_state *sctx = shash_desc_ctx(desc);
- unsigned int partial, done;
- const u8 *src;
-
- partial = sctx->count & 0x3f;
- sctx->count += len;
- done = 0;
- src = data;
-
- if ((partial + len) > 63) {
- if (partial) {
- done = -partial;
- memcpy(sctx->buf + partial, data, done + 64);
- src = sctx->buf;
- }
-
- do {
- sha256_transform(sctx->state, src);
- done += 64;
- src = data + done;
- } while (done + 63 < len);
-
- partial = 0;
- }
- memcpy(sctx->buf + partial, src, len - done);
-
- return 0;
+ return crypto_sha256_base_do_update(desc, data, len,
+ sha256_generic_block_fn, NULL);
}
EXPORT_SYMBOL(crypto_sha256_update);
-static int sha256_final(struct shash_desc *desc, u8 *out)
-{
- struct sha256_state *sctx = shash_desc_ctx(desc);
- __be32 *dst = (__be32 *)out;
- __be64 bits;
- unsigned int index, pad_len;
- int i;
- static const u8 padding[64] = { 0x80, };
-
- /* Save number of bits */
- bits = cpu_to_be64(sctx->count << 3);
-
- /* Pad out to 56 mod 64. */
- index = sctx->count & 0x3f;
- pad_len = (index < 56) ? (56 - index) : ((64+56) - index);
- crypto_sha256_update(desc, padding, pad_len);
-
- /* Append length (before padding) */
- crypto_sha256_update(desc, (const u8 *)&bits, sizeof(bits));
-
- /* Store state in digest */
- for (i = 0; i < 8; i++)
- dst[i] = cpu_to_be32(sctx->state[i]);
-
- /* Zeroize sensitive information. */
- memset(sctx, 0, sizeof(*sctx));
-
- return 0;
-}
-
-static int sha224_final(struct shash_desc *desc, u8 *hash)
-{
- u8 D[SHA256_DIGEST_SIZE];
-
- sha256_final(desc, D);
-
- memcpy(hash, D, SHA224_DIGEST_SIZE);
- memzero_explicit(D, SHA256_DIGEST_SIZE);
-
- return 0;
-}
-
-static int sha256_export(struct shash_desc *desc, void *out)
+int crypto_sha256_finup(struct shash_desc *desc, const u8 *data,
+ unsigned int len, u8 *hash)
{
- struct sha256_state *sctx = shash_desc_ctx(desc);
-
- memcpy(out, sctx, sizeof(*sctx));
- return 0;
+ if (len)
+ crypto_sha256_base_do_update(desc, data, len,
+ sha256_generic_block_fn, NULL);
+ crypto_sha256_base_do_finalize(desc, sha256_generic_block_fn, NULL);
+ return crypto_sha256_base_finish(desc, hash);
}
+EXPORT_SYMBOL(crypto_sha256_finup);
-static int sha256_import(struct shash_desc *desc, const void *in)
+static int sha256_final(struct shash_desc *desc, u8 *out)
{
- struct sha256_state *sctx = shash_desc_ctx(desc);
-
- memcpy(sctx, in, sizeof(*sctx));
- return 0;
+ return crypto_sha256_finup(desc, NULL, 0, out);
}
static struct shash_alg sha256_algs[2] = { {
.digestsize = SHA256_DIGEST_SIZE,
- .init = sha256_init,
+ .init = crypto_sha256_base_init,
.update = crypto_sha256_update,
.final = sha256_final,
- .export = sha256_export,
- .import = sha256_import,
+ .finup = crypto_sha256_finup,
+ .export = crypto_sha256_base_export,
+ .import = crypto_sha256_base_import,
.descsize = sizeof(struct sha256_state),
.statesize = sizeof(struct sha256_state),
.base = {
@@ -355,9 +269,10 @@ static struct shash_alg sha256_algs[2] = { {
}
}, {
.digestsize = SHA224_DIGEST_SIZE,
- .init = sha224_init,
+ .init = crypto_sha224_base_init,
.update = crypto_sha256_update,
- .final = sha224_final,
+ .final = sha256_final,
+ .finup = crypto_sha256_finup,
.descsize = sizeof(struct sha256_state),
.base = {
.cra_name = "sha224",
diff --git a/include/crypto/sha.h b/include/crypto/sha.h
index 17a1c43b2a01..1b4d9a87c2a4 100644
--- a/include/crypto/sha.h
+++ b/include/crypto/sha.h
@@ -97,6 +97,9 @@ extern int crypto_sha1_update(struct shash_desc *desc, const u8 *data,
extern int crypto_sha256_update(struct shash_desc *desc, const u8 *data,
unsigned int len);
+extern int crypto_sha256_finup(struct shash_desc *desc, const u8 *data,
+ unsigned int len, u8 *hash);
+
extern int crypto_sha512_update(struct shash_desc *desc, const u8 *data,
unsigned int len);
--
1.8.3.2
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