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Let sm4_cbc_encrypt_blocks update iv

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If in == out, then after encryptions the input (i.e. iv) is changed
This commit is contained in:
Zhi Guan
2024-05-13 21:44:06 +08:00
parent 3b6c2a3e9b
commit 7f3072e917
5 changed files with 49 additions and 22 deletions
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34
src/sm4.c
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@@ -168,34 +168,42 @@ void sm4_encrypt_blocks(const SM4_KEY *key, const uint8_t *in, size_t nblocks, u
}
}
void sm4_cbc_encrypt_blocks(const SM4_KEY *key, const uint8_t iv[16],
void sm4_cbc_encrypt_blocks(const SM4_KEY *key, uint8_t iv[16],
const uint8_t *in, size_t nblocks, uint8_t *out)
{
uint8_t *piv = iv;
while (nblocks--) {
size_t i;
for (i = 0; i < 16; i++) {
out[i] = in[i] ^ iv[i];
out[i] = in[i] ^ piv[i];
}
sm4_encrypt(key, out, out);
iv = out;
piv = out;
in += 16;
out += 16;
}
memcpy(iv, piv, 16);
}
void sm4_cbc_decrypt_blocks(const SM4_KEY *key, const uint8_t iv[16],
void sm4_cbc_decrypt_blocks(const SM4_KEY *key, uint8_t iv[16],
const uint8_t *in, size_t nblocks, uint8_t *out)
{
uint8_t *piv = iv;
while (nblocks--) {
size_t i;
sm4_encrypt(key, in, out);
for (i = 0; i < 16; i++) {
out[i] ^= iv[i];
out[i] ^= piv[i];
}
iv = in;
piv = in;
in += 16;
out += 16;
}
memcpy(iv, piv, 16);
}
static void ctr_incr(uint8_t a[16]) {
@@ -630,7 +638,7 @@ void sm4_encrypt_blocks(const SM4_KEY *key, const uint8_t *in, size_t nblocks, u
}
}
void sm4_cbc_encrypt_blocks(const SM4_KEY *key, const uint8_t iv[16], const uint8_t *in, size_t nblocks, uint8_t *out)
void sm4_cbc_encrypt_blocks(const SM4_KEY *key, uint8_t iv[16], const uint8_t *in, size_t nblocks, uint8_t *out)
{
const uint32_t *rk = key->rk;
uint32_t X0, X1, X2, X3, X4;
@@ -690,9 +698,14 @@ void sm4_cbc_encrypt_blocks(const SM4_KEY *key, const uint8_t iv[16], const uint
in += 16;
out += 16;
}
PUTU32(iv , X0);
PUTU32(iv + 4, X4);
PUTU32(iv + 8, X3);
PUTU32(iv + 12, X2);
}
void sm4_cbc_decrypt_blocks(const SM4_KEY *key, const uint8_t iv[16], const uint8_t *in, size_t nblocks, uint8_t *out)
void sm4_cbc_decrypt_blocks(const SM4_KEY *key, uint8_t iv[16], const uint8_t *in, size_t nblocks, uint8_t *out)
{
const uint32_t *rk = key->rk;
uint32_t IV0, IV1, IV2, IV3;
@@ -756,6 +769,11 @@ void sm4_cbc_decrypt_blocks(const SM4_KEY *key, const uint8_t iv[16], const uint
in += 16;
out += 16;
}
PUTU32(iv , IV0);
PUTU32(iv + 4, IV1);
PUTU32(iv + 8, IV2);
PUTU32(iv + 12, IV3);
}
void sm4_ctr_encrypt_blocks(const SM4_KEY *key, uint8_t ctr[16], const uint8_t *in, size_t nblocks, uint8_t *out)