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crypto: sha1_generic - Add export/import support

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This patch adds export/import support to sha1_generic.  The exported
type is defined by struct sha1_state, which is basically the entire
descriptor state of sha1_generic.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2009-07-09 21:27:13 +08:00
parent 8267adab94
commit e2a7ce4e18
2 changed files with 33 additions and 16 deletions
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41
crypto/sha1_generic.c
View file

@ -25,31 +25,21 @@
#include <crypto/sha.h>
#include <asm/byteorder.h>
struct sha1_ctx {
u64 count;
u32 state[5];
u8 buffer[64];
};
static int sha1_init(struct shash_desc *desc)
{
struct sha1_ctx *sctx = shash_desc_ctx(desc);
struct sha1_state *sctx = shash_desc_ctx(desc);
static const struct sha1_ctx initstate = {
0,
{ SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 },
{ 0, }
*sctx = (struct sha1_state){
.state = { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 },
};
*sctx = initstate;
return 0;
}
static int sha1_update(struct shash_desc *desc, const u8 *data,
unsigned int len)
{
struct sha1_ctx *sctx = shash_desc_ctx(desc);
struct sha1_state *sctx = shash_desc_ctx(desc);
unsigned int partial, done;
const u8 *src;
@ -85,7 +75,7 @@ static int sha1_update(struct shash_desc *desc, const u8 *data,
/* Add padding and return the message digest. */
static int sha1_final(struct shash_desc *desc, u8 *out)
{
struct sha1_ctx *sctx = shash_desc_ctx(desc);
struct sha1_state *sctx = shash_desc_ctx(desc);
__be32 *dst = (__be32 *)out;
u32 i, index, padlen;
__be64 bits;
@ -111,12 +101,31 @@ static int sha1_final(struct shash_desc *desc, u8 *out)
return 0;
}
static int sha1_export(struct shash_desc *desc, void *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;
}
static struct shash_alg alg = {
.digestsize = SHA1_DIGEST_SIZE,
.init = sha1_init,
.update = sha1_update,
.final = sha1_final,
.descsize = sizeof(struct sha1_ctx),
.export = sha1_export,
.import = sha1_import,
.descsize = sizeof(struct sha1_state),
.statesize = sizeof(struct sha1_state),
.base = {
.cra_name = "sha1",
.cra_driver_name= "sha1-generic",

8
include/crypto/sha.h
View file

@ -5,6 +5,8 @@
#ifndef _CRYPTO_SHA_H
#define _CRYPTO_SHA_H
#include <linux/types.h>
#define SHA1_DIGEST_SIZE 20
#define SHA1_BLOCK_SIZE 64
@ -62,4 +64,10 @@
#define SHA512_H6 0x1f83d9abfb41bd6bULL
#define SHA512_H7 0x5be0cd19137e2179ULL
struct sha1_state {
u64 count;
u32 state[SHA1_DIGEST_SIZE / 4];
u8 buffer[SHA1_BLOCK_SIZE];
};
#endif