[PATCH v2 04/14] crypto: sha512-generic: move to generic glue implementation
Ard Biesheuvel
ard.biesheuvel at linaro.org
Mon Mar 30 02:36:17 PDT 2015
This updated the generic SHA-512 implementation to use the
generic shared SHA-512 glue code.
It also implements a .finup hook crypto_sha512_finup() and exports
it to other modules.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel at linaro.org>
---
crypto/Kconfig | 1 +
crypto/sha512_generic.c | 126 ++++++++++--------------------------------------
include/crypto/sha.h | 2 +
3 files changed, 28 insertions(+), 101 deletions(-)
diff --git a/crypto/Kconfig b/crypto/Kconfig
index 155cc15c2719..83bc1680391a 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -653,6 +653,7 @@ config CRYPTO_SHA512_BASE
config CRYPTO_SHA512
tristate "SHA384 and SHA512 digest algorithms"
+ select CRYPTO_SHA512_BASE
select CRYPTO_HASH
help
SHA512 secure hash standard (DFIPS 180-2).
diff --git a/crypto/sha512_generic.c b/crypto/sha512_generic.c
index 1c3c3767e079..88f36a6920ef 100644
--- a/crypto/sha512_generic.c
+++ b/crypto/sha512_generic.c
@@ -130,125 +130,48 @@ sha512_transform(u64 *state, const u8 *input)
a = b = c = d = e = f = g = h = t1 = t2 = 0;
}
-static int
-sha512_init(struct shash_desc *desc)
+static void sha512_generic_block_fn(int blocks, u8 const *src, u64 *state,
+ const u8 *head, void *p)
{
- struct sha512_state *sctx = shash_desc_ctx(desc);
- sctx->state[0] = SHA512_H0;
- sctx->state[1] = SHA512_H1;
- sctx->state[2] = SHA512_H2;
- sctx->state[3] = SHA512_H3;
- sctx->state[4] = SHA512_H4;
- sctx->state[5] = SHA512_H5;
- sctx->state[6] = SHA512_H6;
- sctx->state[7] = SHA512_H7;
- sctx->count[0] = sctx->count[1] = 0;
+ if (head)
+ sha512_transform(state, head);
- return 0;
-}
-
-static int
-sha384_init(struct shash_desc *desc)
-{
- struct sha512_state *sctx = shash_desc_ctx(desc);
- sctx->state[0] = SHA384_H0;
- sctx->state[1] = SHA384_H1;
- sctx->state[2] = SHA384_H2;
- sctx->state[3] = SHA384_H3;
- sctx->state[4] = SHA384_H4;
- sctx->state[5] = SHA384_H5;
- sctx->state[6] = SHA384_H6;
- sctx->state[7] = SHA384_H7;
- sctx->count[0] = sctx->count[1] = 0;
-
- return 0;
+ while (blocks--) {
+ sha512_transform(state, src);
+ src += SHA512_BLOCK_SIZE;
+ }
}
int crypto_sha512_update(struct shash_desc *desc, const u8 *data,
unsigned int len)
{
- struct sha512_state *sctx = shash_desc_ctx(desc);
-
- unsigned int i, index, part_len;
-
- /* Compute number of bytes mod 128 */
- index = sctx->count[0] & 0x7f;
-
- /* Update number of bytes */
- if ((sctx->count[0] += len) < len)
- sctx->count[1]++;
-
- part_len = 128 - index;
-
- /* Transform as many times as possible. */
- if (len >= part_len) {
- memcpy(&sctx->buf[index], data, part_len);
- sha512_transform(sctx->state, sctx->buf);
-
- for (i = part_len; i + 127 < len; i+=128)
- sha512_transform(sctx->state, &data[i]);
-
- index = 0;
- } else {
- i = 0;
- }
-
- /* Buffer remaining input */
- memcpy(&sctx->buf[index], &data[i], len - i);
-
- return 0;
+ return crypto_sha512_base_do_update(desc, data, len,
+ sha512_generic_block_fn, NULL);
}
EXPORT_SYMBOL(crypto_sha512_update);
-static int
-sha512_final(struct shash_desc *desc, u8 *hash)
+int crypto_sha512_finup(struct shash_desc *desc, const u8 *data,
+ unsigned int len, u8 *hash)
{
- struct sha512_state *sctx = shash_desc_ctx(desc);
- static u8 padding[128] = { 0x80, };
- __be64 *dst = (__be64 *)hash;
- __be64 bits[2];
- unsigned int index, pad_len;
- int i;
-
- /* Save number of bits */
- bits[1] = cpu_to_be64(sctx->count[0] << 3);
- bits[0] = cpu_to_be64(sctx->count[1] << 3 | sctx->count[0] >> 61);
-
- /* Pad out to 112 mod 128. */
- index = sctx->count[0] & 0x7f;
- pad_len = (index < 112) ? (112 - index) : ((128+112) - index);
- crypto_sha512_update(desc, padding, pad_len);
-
- /* Append length (before padding) */
- crypto_sha512_update(desc, (const u8 *)bits, sizeof(bits));
-
- /* Store state in digest */
- for (i = 0; i < 8; i++)
- dst[i] = cpu_to_be64(sctx->state[i]);
-
- /* Zeroize sensitive information. */
- memset(sctx, 0, sizeof(struct sha512_state));
-
- return 0;
+ if (len)
+ crypto_sha512_base_do_update(desc, data, len,
+ sha512_generic_block_fn, NULL);
+ crypto_sha512_base_do_finalize(desc, sha512_generic_block_fn, NULL);
+ return crypto_sha512_base_finish(desc, hash);
}
+EXPORT_SYMBOL(crypto_sha512_finup);
-static int sha384_final(struct shash_desc *desc, u8 *hash)
+int sha512_final(struct shash_desc *desc, u8 *hash)
{
- u8 D[64];
-
- sha512_final(desc, D);
-
- memcpy(hash, D, 48);
- memzero_explicit(D, 64);
-
- return 0;
+ return crypto_sha512_finup(desc, NULL, 0, hash);
}
static struct shash_alg sha512_algs[2] = { {
.digestsize = SHA512_DIGEST_SIZE,
- .init = sha512_init,
+ .init = crypto_sha512_base_init,
.update = crypto_sha512_update,
.final = sha512_final,
+ .finup = crypto_sha512_finup,
.descsize = sizeof(struct sha512_state),
.base = {
.cra_name = "sha512",
@@ -259,9 +182,10 @@ static struct shash_alg sha512_algs[2] = { {
}
}, {
.digestsize = SHA384_DIGEST_SIZE,
- .init = sha384_init,
+ .init = crypto_sha384_base_init,
.update = crypto_sha512_update,
- .final = sha384_final,
+ .final = sha512_final,
+ .finup = crypto_sha512_finup,
.descsize = sizeof(struct sha512_state),
.base = {
.cra_name = "sha384",
diff --git a/include/crypto/sha.h b/include/crypto/sha.h
index 63cba0bbf3bc..17a1c43b2a01 100644
--- a/include/crypto/sha.h
+++ b/include/crypto/sha.h
@@ -100,6 +100,8 @@ extern int crypto_sha256_update(struct shash_desc *desc, const u8 *data,
extern int crypto_sha512_update(struct shash_desc *desc, const u8 *data,
unsigned int len);
+extern int crypto_sha512_finup(struct shash_desc *desc, const u8 *data,
+ unsigned int len, u8 *hash);
extern int crypto_sha384_base_init(struct shash_desc *desc);
extern int crypto_sha512_base_init(struct shash_desc *desc);
--
1.8.3.2
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