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authorJan Glauber <jan.glauber@de.ibm.com>2006-01-14 13:20:56 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-14 18:27:08 -0800
commit7ffbc9da137ef475afd5e01f72e1ce1ce49668b1 (patch)
treece30c284745e148e4159190ae84b700d556bd67b /arch/s390/crypto
parentfda5e142598341d30006e3715e53b2c983a9fca7 (diff)
downloadlinux-linaro-stable-7ffbc9da137ef475afd5e01f72e1ce1ce49668b1.tar.gz
[PATCH] s390: sha256 crypto code fix
Fix processing of messages larger than 2 * SHA256_BLOCK_SIZE. Signed-off-by: Jan Glauber <jan.glauber@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/s390/crypto')
-rw-r--r--arch/s390/crypto/sha256_s390.c29
1 files changed, 22 insertions, 7 deletions
diff --git a/arch/s390/crypto/sha256_s390.c b/arch/s390/crypto/sha256_s390.c
index b75bdbd476c7..1ec5e92b3454 100644
--- a/arch/s390/crypto/sha256_s390.c
+++ b/arch/s390/crypto/sha256_s390.c
@@ -51,6 +51,7 @@ static void sha256_update(void *ctx, const u8 *data, unsigned int len)
{
struct s390_sha256_ctx *sctx = ctx;
unsigned int index;
+ int ret;
/* how much is already in the buffer? */
index = sctx->count / 8 & 0x3f;
@@ -58,15 +59,29 @@ static void sha256_update(void *ctx, const u8 *data, unsigned int len)
/* update message bit length */
sctx->count += len * 8;
- /* process one block */
- if ((index + len) >= SHA256_BLOCK_SIZE) {
+ if ((index + len) < SHA256_BLOCK_SIZE)
+ goto store;
+
+ /* process one stored block */
+ if (index) {
memcpy(sctx->buf + index, data, SHA256_BLOCK_SIZE - index);
- crypt_s390_kimd(KIMD_SHA_256, sctx->state, sctx->buf,
- SHA256_BLOCK_SIZE);
+ ret = crypt_s390_kimd(KIMD_SHA_256, sctx->state, sctx->buf,
+ SHA256_BLOCK_SIZE);
+ BUG_ON(ret != SHA256_BLOCK_SIZE);
data += SHA256_BLOCK_SIZE - index;
len -= SHA256_BLOCK_SIZE - index;
}
+ /* process as many blocks as possible */
+ if (len >= SHA256_BLOCK_SIZE) {
+ ret = crypt_s390_kimd(KIMD_SHA_256, sctx->state, data,
+ len & ~(SHA256_BLOCK_SIZE - 1));
+ BUG_ON(ret != (len & ~(SHA256_BLOCK_SIZE - 1)));
+ data += ret;
+ len -= ret;
+ }
+
+store:
/* anything left? */
if (len)
memcpy(sctx->buf + index , data, len);
@@ -119,9 +134,9 @@ static struct crypto_alg alg = {
.cra_list = LIST_HEAD_INIT(alg.cra_list),
.cra_u = { .digest = {
.dia_digestsize = SHA256_DIGEST_SIZE,
- .dia_init = sha256_init,
- .dia_update = sha256_update,
- .dia_final = sha256_final } }
+ .dia_init = sha256_init,
+ .dia_update = sha256_update,
+ .dia_final = sha256_final } }
};
static int init(void)