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fix: update SDF CBC decrypt IV

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This commit is contained in:
wangtsiao
2026-06-12 19:48:35 -10:00
parent 23375d1fa3
commit f5cd5764a0
1 changed files with 5 additions and 3 deletions
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8
src/sdf/sdf.c
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@@ -291,9 +291,13 @@ static int sdf_cbc_encrypt_blocks(SDF_KEY *key, uint8_t iv[16], const uint8_t *i
static int sdf_cbc_decrypt_blocks(SDF_KEY *key, uint8_t iv[16], const uint8_t *in, size_t nblocks, uint8_t *out)
{
uint8_t last_block[16];
unsigned int inlen = (unsigned int)(nblocks * 16);
unsigned int outlen = 0;
if (inlen) {
memcpy(last_block, in + inlen - 16, 16);
}
if (SDF_Decrypt(key->session, key->handle, SGD_SM4_CBC,
iv, (unsigned char *)in, inlen, out, &outlen) != SDR_OK) {
error_print();
@@ -304,9 +308,7 @@ static int sdf_cbc_decrypt_blocks(SDF_KEY *key, uint8_t iv[16], const uint8_t *i
return -1;
}
if (inlen) {
if (memcmp(iv, in + inlen - 16, 16) != 0) {
memcmp(iv, in + inlen - 16, 16);
}
memcpy(iv, last_block, 16);
}
return 1;
}