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crypto: sha512-generic - move to generic glue implementation 

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. 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>
This commit is contained in:
Ard Biesheuvel 2015-04-09 12:55:38 +02:00 committed by Herbert Xu
parent a2e5ba4fed
commit ca142584bc
2 changed files with 24 additions and 102 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

123
crypto/sha512_generic.c
View File

@ -18,6 +18,7 @@
#include <linux/crypto.h> #include <linux/crypto.h>
#include <linux/types.h> #include <linux/types.h>
#include <crypto/sha.h> #include <crypto/sha.h>
#include <crypto/sha512_base.h>
#include <linux/percpu.h> #include <linux/percpu.h>
#include <asm/byteorder.h> #include <asm/byteorder.h>
#include <asm/unaligned.h> #include <asm/unaligned.h>
@ -130,125 +131,42 @@ sha512_transform(u64 *state, const u8 *input)
a = b = c = d = e = f = g = h = t1 = t2 = 0; a = b = c = d = e = f = g = h = t1 = t2 = 0;
} }
static int static void sha512_generic_block_fn(struct sha512_state *sst, u8 const *src,
sha512_init(struct shash_desc *desc) int blocks)
{ {
struct sha512_state *sctx = shash_desc_ctx(desc); while (blocks--) {
sctx->state[0] = SHA512_H0; sha512_transform(sst->state, src);
sctx->state[1] = SHA512_H1; src += SHA512_BLOCK_SIZE;
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;
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;
} }
int crypto_sha512_update(struct shash_desc *desc, const u8 *data, int crypto_sha512_update(struct shash_desc *desc, const u8 *data,
unsigned int len) unsigned int len)
{ {
struct sha512_state *sctx = shash_desc_ctx(desc); return sha512_base_do_update(desc, data, len, sha512_generic_block_fn);
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;
} }
EXPORT_SYMBOL(crypto_sha512_update); EXPORT_SYMBOL(crypto_sha512_update);
static int static int sha512_final(struct shash_desc *desc, u8 *hash)
sha512_final(struct shash_desc *desc, u8 *hash)
{ {
struct sha512_state *sctx = shash_desc_ctx(desc); sha512_base_do_finalize(desc, sha512_generic_block_fn);
static u8 padding[128] = { 0x80, }; return sha512_base_finish(desc, hash);
__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;
} }
static int sha384_final(struct shash_desc *desc, u8 *hash) int crypto_sha512_finup(struct shash_desc *desc, const u8 *data,
unsigned int len, u8 *hash)
{ {
u8 D[64]; sha512_base_do_update(desc, data, len, sha512_generic_block_fn);
return sha512_final(desc, hash);
sha512_final(desc, D);
memcpy(hash, D, 48);
memzero_explicit(D, 64);
return 0;
} }
EXPORT_SYMBOL(crypto_sha512_finup);
static struct shash_alg sha512_algs[2] = { { static struct shash_alg sha512_algs[2] = { {
.digestsize = SHA512_DIGEST_SIZE, .digestsize = SHA512_DIGEST_SIZE,
.init = sha512_init, .init = sha512_base_init,
.update = crypto_sha512_update, .update = crypto_sha512_update,
.final = sha512_final, .final = sha512_final,
.finup = crypto_sha512_finup,
.descsize = sizeof(struct sha512_state), .descsize = sizeof(struct sha512_state),
.base = { .base = {
.cra_name = "sha512", .cra_name = "sha512",
@ -259,9 +177,10 @@ static struct shash_alg sha512_algs[2] = { {
} }
}, { }, {
.digestsize = SHA384_DIGEST_SIZE, .digestsize = SHA384_DIGEST_SIZE,
.init = sha384_init, .init = sha384_base_init,
.update = crypto_sha512_update, .update = crypto_sha512_update,
.final = sha384_final, .final = sha512_final,
.finup = crypto_sha512_finup,
.descsize = sizeof(struct sha512_state), .descsize = sizeof(struct sha512_state),
.base = { .base = {
.cra_name = "sha384", .cra_name = "sha384",

3
include/crypto/sha.h
View File

@ -98,4 +98,7 @@ extern int crypto_sha256_finup(struct shash_desc *desc, const u8 *data,
extern int crypto_sha512_update(struct shash_desc *desc, const u8 *data, extern int crypto_sha512_update(struct shash_desc *desc, const u8 *data,
unsigned int len); unsigned int len);
extern int crypto_sha512_finup(struct shash_desc *desc, const u8 *data,
unsigned int len, u8 *hash);
#endif #endif