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Update sm4_cbc.c

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Zhi Guan
2024-04-28 17:14:24 +08:00
parent 060930093f
commit 660b4cfc53
1 changed files with 14 additions and 0 deletions
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14
src/sm4_cbc.c
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@@ -27,6 +27,20 @@ void sm4_cbc_encrypt(const SM4_KEY *key, const uint8_t iv[16],
void sm4_cbc_decrypt(const SM4_KEY *key, const uint8_t iv[16],
const uint8_t *in, size_t nblocks, uint8_t *out)
{
while (nblocks >= 8) {
uint8_t buf[16 * 8];
sm4_encrypt_blocks(key, in, 8, buf);
gmssl_memxor(out, buf, iv, 16);
gmssl_memxor(out + 16, buf + 16, in, 16 * (8 - 1));
iv = in + 16 * (8 - 1);
in += 16 * 8;
out += 16 * 8;
nblocks -= 8;
}
while (nblocks--) {
sm4_encrypt(key, in, out);
memxor(out, iv, 16);