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Update sm4 tool to support more modes

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This commit is contained in:
Zhi Guan
2024-02-21 09:24:22 +08:00
parent 326e7de416
commit 79a6437c8c
4 changed files with 526 additions and 27 deletions
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203
src/sm4_xts.c
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@@ -14,10 +14,10 @@
#include <gmssl/error.h>
int sm4_xts_encrypt(const SM4_KEY *key1, const SM4_KEY *key2, size_t tweak,
int sm4_xts_encrypt(const SM4_KEY *key1, const SM4_KEY *key2, const uint8_t tweak[16],
const uint8_t *in, size_t inlen, uint8_t *out)
{
uint8_t T[16] = {0};
uint8_t T[16];
uint8_t block[16];
size_t nblocks, i;
gf128_t a;
@@ -28,10 +28,7 @@ int sm4_xts_encrypt(const SM4_KEY *key1, const SM4_KEY *key2, size_t tweak,
}
nblocks = inlen / 16 + 1;
for (i = 0; i < 8; i++) {
T[i] = tweak & 0xff;
tweak >>= 8;
}
memcpy(T, tweak, 16);
sm4_encrypt(key2, T, T);
for (i = 0; i < nblocks - 2; i++) {
@@ -76,10 +73,10 @@ int sm4_xts_encrypt(const SM4_KEY *key1, const SM4_KEY *key2, size_t tweak,
return 1;
}
int sm4_xts_decrypt(const SM4_KEY *key1, const SM4_KEY *key2, size_t tweak,
int sm4_xts_decrypt(const SM4_KEY *key1, const SM4_KEY *key2, const uint8_t tweak[16],
const uint8_t *in, size_t inlen, uint8_t *out)
{
uint8_t T[16] = {0};
uint8_t T[16];
uint8_t block[16];
size_t nblocks, i;
gf128_t a;
@@ -90,10 +87,7 @@ int sm4_xts_decrypt(const SM4_KEY *key1, const SM4_KEY *key2, size_t tweak,
}
nblocks = inlen / 16 + 1;
for (i = 0; i < 8; i++) {
T[i] = tweak & 0xff;
tweak >>= 8;
}
memcpy(T, tweak, 16);
sm4_encrypt(key2, T, T);
for (i = 0; i < nblocks - 2; i++) {
@@ -140,3 +134,188 @@ int sm4_xts_decrypt(const SM4_KEY *key1, const SM4_KEY *key2, size_t tweak,
return 1;
}
static void tweak_incr(uint8_t a[16])
{
int i;
for (i = 0; i < 16; i++) {
a[i]++;
if (a[i]) break;
}
}
int sm4_xts_encrypt_init(SM4_XTS_CTX *ctx, const uint8_t key[32], const uint8_t iv[16], size_t data_unit_size)
{
if (data_unit_size < SM4_BLOCK_SIZE) {
error_print();
return -1;
}
sm4_set_encrypt_key(&ctx->key1, key);
sm4_set_encrypt_key(&ctx->key2, key + 16);
memcpy(ctx->tweak, iv, 16);
ctx->data_unit_size = data_unit_size;
if (!(ctx->block = (uint8_t *)malloc(data_unit_size))) {
error_print();
return -1;
}
ctx->block_nbytes = 0;
return 1;
}
int sm4_xts_encrypt_update(SM4_XTS_CTX *ctx,
const uint8_t *in, size_t inlen, uint8_t *out, size_t *outlen)
{
size_t DATA_UNIT_SIZE = ctx->data_unit_size;
size_t left;
size_t nblocks;
size_t len;
if (ctx->block_nbytes >= DATA_UNIT_SIZE) {
error_print();
return -1;
}
*outlen = 0;
if (ctx->block_nbytes) {
left = DATA_UNIT_SIZE - ctx->block_nbytes;
if (inlen < left) {
memcpy(ctx->block + ctx->block_nbytes, in, inlen);
ctx->block_nbytes += inlen;
return 1;
}
memcpy(ctx->block + ctx->block_nbytes, in, left);
if (sm4_xts_encrypt(&ctx->key1, &ctx->key2, ctx->tweak, ctx->block, DATA_UNIT_SIZE, out) != 1) {
error_print();
return -1;
}
tweak_incr(ctx->tweak);
in += left;
inlen -= left;
out += DATA_UNIT_SIZE;
*outlen += DATA_UNIT_SIZE;
}
while (inlen >= DATA_UNIT_SIZE) {
if (sm4_xts_encrypt(&ctx->key1, &ctx->key2, ctx->tweak, in, DATA_UNIT_SIZE, out) != 1) {
error_print();
return -1;
}
tweak_incr(ctx->tweak);
in += DATA_UNIT_SIZE;
inlen -= DATA_UNIT_SIZE;
out += DATA_UNIT_SIZE;
*outlen += DATA_UNIT_SIZE;
}
if (inlen) {
memcpy(ctx->block, in, inlen);
}
ctx->block_nbytes = inlen;
return 1;
}
int sm4_xts_encrypt_finish(SM4_XTS_CTX *ctx, uint8_t *out, size_t *outlen)
{
size_t DATA_UNIT_SIZE = ctx->data_unit_size;
if (ctx->block_nbytes >= DATA_UNIT_SIZE) {
error_print();
return -1;
}
if (ctx->block) {
free(ctx->block);
ctx->block = NULL;
}
if (ctx->block_nbytes) {
error_puts("invalid total input length");
return -1;
}
*outlen = 0;
return 1;
}
int sm4_xts_decrypt_init(SM4_XTS_CTX *ctx, const uint8_t key[32], const uint8_t iv[16], size_t data_unit_size)
{
if (data_unit_size < SM4_BLOCK_SIZE) {
error_print();
return -1;
}
sm4_set_decrypt_key(&ctx->key1, key);
sm4_set_encrypt_key(&ctx->key2, key + 16);
memcpy(ctx->tweak, iv, 16);
ctx->data_unit_size = data_unit_size;
if (!(ctx->block = (uint8_t *)malloc(data_unit_size))) {
error_print();
return -1;
}
ctx->block_nbytes = 0;
return 1;
}
int sm4_xts_decrypt_update(SM4_XTS_CTX *ctx,
const uint8_t *in, size_t inlen, uint8_t *out, size_t *outlen)
{
size_t DATA_UNIT_SIZE = ctx->data_unit_size;
size_t left;
size_t nblocks;
size_t len;
if (ctx->block_nbytes >= DATA_UNIT_SIZE) {
error_print();
return -1;
}
*outlen = 0;
if (ctx->block_nbytes) {
left = DATA_UNIT_SIZE - ctx->block_nbytes;
if (inlen < left) {
memcpy(ctx->block + ctx->block_nbytes, in, inlen);
ctx->block_nbytes += inlen;
return 1;
}
memcpy(ctx->block + ctx->block_nbytes, in, left);
if (sm4_xts_decrypt(&ctx->key1, &ctx->key2, ctx->tweak, ctx->block, DATA_UNIT_SIZE, out) != 1) {
error_print();
return -1;
}
tweak_incr(ctx->tweak);
in += left;
inlen -= left;
out += DATA_UNIT_SIZE;
*outlen += DATA_UNIT_SIZE;
}
while (inlen >= DATA_UNIT_SIZE) {
if (sm4_xts_decrypt(&ctx->key1, &ctx->key2, ctx->tweak, in, DATA_UNIT_SIZE, out) != 1) {
error_print();
return -1;
}
tweak_incr(ctx->tweak);
in += DATA_UNIT_SIZE;
inlen -= DATA_UNIT_SIZE;
out += DATA_UNIT_SIZE;
*outlen += DATA_UNIT_SIZE;
}
if (inlen) {
memcpy(ctx->block, in, inlen);
}
ctx->block_nbytes = inlen;
return 1;
}
int sm4_xts_decrypt_finish(SM4_XTS_CTX *ctx, uint8_t *out, size_t *outlen)
{
size_t DATA_UNIT_SIZE = ctx->data_unit_size;
if (ctx->block_nbytes >= DATA_UNIT_SIZE) {
error_print();
return -1;
}
if (ctx->block) {
free(ctx->block);
ctx->block = NULL;
}
if (ctx->block_nbytes) {
error_puts("invalid total input length");
return -1;
}
*outlen = 0;
return 1;
}