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crypto: lib/sm3 - Export generic block function 

Export the generic block function so that it can be used by the
Crypto API.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2025-04-12 18:57:31 +08:00
parent f4065b2f63
commit cb16ba4695
2 changed files with 13 additions and 13 deletions
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1
include/crypto/sm3.h
View File

@ -58,6 +58,7 @@ static inline void sm3_init(struct sm3_state *sctx)
sctx->count = 0;
}
void sm3_block_generic(struct sm3_state *sctx, u8 const *data, int blocks);
void sm3_update(struct sm3_state *sctx, const u8 *data, unsigned int len);
void sm3_final(struct sm3_state *sctx, u8 *out);

25
lib/crypto/sm3.c
View File

@ -166,19 +166,22 @@ static void sm3_transform(struct sm3_state *sctx, u8 const *data, u32 W[16])
#undef W1
#undef W2
static inline void sm3_block(struct sm3_state *sctx,
u8 const *data, int blocks, u32 W[16])
void sm3_block_generic(struct sm3_state *sctx, u8 const *data, int blocks)
{
while (blocks--) {
u32 W[16];
do {
sm3_transform(sctx, data, W);
data += SM3_BLOCK_SIZE;
}
} while (--blocks);
memzero_explicit(W, sizeof(W));
}
EXPORT_SYMBOL_GPL(sm3_block_generic);
void sm3_update(struct sm3_state *sctx, const u8 *data, unsigned int len)
{
unsigned int partial = sctx->count % SM3_BLOCK_SIZE;
u32 W[16];
sctx->count += len;
@ -192,19 +195,17 @@ void sm3_update(struct sm3_state *sctx, const u8 *data, unsigned int len)
data += p;
len -= p;
sm3_block(sctx, sctx->buffer, 1, W);
sm3_block_generic(sctx, sctx->buffer, 1);
}
blocks = len / SM3_BLOCK_SIZE;
len %= SM3_BLOCK_SIZE;
if (blocks) {
sm3_block(sctx, data, blocks, W);
sm3_block_generic(sctx, data, blocks);
data += blocks * SM3_BLOCK_SIZE;
}
memzero_explicit(W, sizeof(W));
partial = 0;
}
if (len)
@ -218,7 +219,6 @@ void sm3_final(struct sm3_state *sctx, u8 *out)
__be64 *bits = (__be64 *)(sctx->buffer + bit_offset);
__be32 *digest = (__be32 *)out;
unsigned int partial = sctx->count % SM3_BLOCK_SIZE;
u32 W[16];
int i;
sctx->buffer[partial++] = 0x80;
@ -226,18 +226,17 @@ void sm3_final(struct sm3_state *sctx, u8 *out)
memset(sctx->buffer + partial, 0, SM3_BLOCK_SIZE - partial);
partial = 0;
sm3_block(sctx, sctx->buffer, 1, W);
sm3_block_generic(sctx, sctx->buffer, 1);
}
memset(sctx->buffer + partial, 0, bit_offset - partial);
*bits = cpu_to_be64(sctx->count << 3);
sm3_block(sctx, sctx->buffer, 1, W);
sm3_block_generic(sctx, sctx->buffer, 1);
for (i = 0; i < 8; i++)
put_unaligned_be32(sctx->state[i], digest++);
/* Zeroize sensitive information. */
memzero_explicit(W, sizeof(W));
memzero_explicit(sctx, sizeof(*sctx));
}
EXPORT_SYMBOL_GPL(sm3_final);