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fix ctr mode counter, add ctr test

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This commit is contained in:
toorls
2022-09-06 05:34:27 -07:00
parent 60c3c33116
commit db06ccff49
2 changed files with 45 additions and 1 deletions
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2
src/sm4_modes.c
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@@ -95,7 +95,7 @@ int sm4_cbc_padding_decrypt(const SM4_KEY *key, const uint8_t iv[16],
static void ctr_incr(uint8_t a[16])
{
int i;
for (i = 15; i > 0; i--) {
for (i = 15; i >= 0; i--) {
a[i]++;
if (a[i]) break;
}

44
tests/sm4test.c
View File

@@ -195,6 +195,50 @@ static int test_sm4_ctr(void)
return 1;
}
static int test_sm4_ctr_with_carray(void)
{
const char *hex_key = "0123456789ABCDEFFEDCBA9876543210";
const char *hex_ctr = "0000000000000000000000000000FFFF";
const char *hex_in = "AAAAAAAAAAAAAAAABBBBBBBBBBBBBBBB"
"CCCCCCCCCCCCCCCCDDDDDDDDDDDD";
const char *hex_out = "7EA678F9F0CBE2000917C63D4E77B4C8"
"6E4E8532B0046E4AC1E97DA8B831";
SM4_KEY sm4_key;
uint8_t key[16] = {0};
uint8_t ctr[16];
uint8_t buf1[30] = {0};
uint8_t buf2[30] = {0};
uint8_t buf3[30] = {0};
size_t keylen, ctrlen, inlen, outlen;
hex_to_bytes(hex_key, strlen(hex_key), key, &keylen);
hex_to_bytes(hex_ctr, strlen(hex_ctr), ctr, &ctrlen);
hex_to_bytes(hex_in, strlen(hex_in), buf1, &inlen);
hex_to_bytes(hex_out, strlen(hex_out), buf3, &outlen);
sm4_set_encrypt_key(&sm4_key, key);
sm4_ctr_encrypt(&sm4_key, ctr, buf1, sizeof(buf1), buf2);
if (memcmp(buf2, buf3, sizeof(buf3)) != 0) {
error_print();
return -1;
}
hex_to_bytes(hex_ctr, strlen(hex_ctr), ctr, &ctrlen);
sm4_ctr_decrypt(&sm4_key, ctr, buf3, sizeof(buf3), buf2);
if (memcmp(buf2, buf1, sizeof(buf1)) != 0) {
error_print();
return -1;
}
printf("%s() ok\n", __FUNCTION__);
return 1;
}
static int test_sm4_gcm(void)
{
// gcm test vectors from rfc 8998 A.1