void SEED_ecb_encrypt(const unsigned char *in, unsigned char *out, const SEED_KEY_SCHEDULE *ks, int enc)
{
if (enc)
SEED_encrypt(in, out, ks);
else
SEED_decrypt(in, out, ks);
}
void SEED_cbc_encrypt(const unsigned char *in, unsigned char *out,
size_t len, const SEED_KEY_SCHEDULE *ks,
unsigned char ivec[SEED_BLOCK_SIZE], int enc)
{
size_t n;
unsigned char tmp[SEED_BLOCK_SIZE];
const unsigned char *iv = ivec;
if (enc) {
while (len >= SEED_BLOCK_SIZE) {
for (n = 0; n < SEED_BLOCK_SIZE; ++n)
out[n] = in[n] ^ iv[n];
SEED_encrypt(out, out, ks);
iv = out;
len -= SEED_BLOCK_SIZE;
in += SEED_BLOCK_SIZE;
out += SEED_BLOCK_SIZE;
}
if (len) {
for (n = 0; n < len; ++n)
out[n] = in[n] ^ iv[n];
for (n = len; n < SEED_BLOCK_SIZE; ++n)
out[n] = iv[n];
SEED_encrypt(out, out, ks);
iv = out;
}
memcpy(ivec, iv, SEED_BLOCK_SIZE);
} else if (in != out) { /* decrypt */
while (len >= SEED_BLOCK_SIZE) {
SEED_decrypt(in, out, ks);
for (n = 0; n < SEED_BLOCK_SIZE; ++n)
out[n] ^= iv[n];
iv = in;
len -= SEED_BLOCK_SIZE;
in += SEED_BLOCK_SIZE;
out += SEED_BLOCK_SIZE;
}
if (len) {
SEED_decrypt(in, tmp, ks);
for (n = 0; n < len; ++n)
out[n] = tmp[n] ^ iv[n];
iv = in;
}
memcpy(ivec, iv, SEED_BLOCK_SIZE);
} else { /* decrypt, overlap */
while (len >= SEED_BLOCK_SIZE) {
memcpy(tmp, in, SEED_BLOCK_SIZE);
SEED_decrypt(in, out, ks);
for (n = 0; n < SEED_BLOCK_SIZE; ++n)
out[n] ^= ivec[n];
memcpy(ivec, tmp, SEED_BLOCK_SIZE);
len -= SEED_BLOCK_SIZE;
in += SEED_BLOCK_SIZE;
out += SEED_BLOCK_SIZE;
}
if (len) {
memcpy(tmp, in, SEED_BLOCK_SIZE);
SEED_decrypt(tmp, tmp, ks);
for (n = 0; n < len; ++n)
out[n] = tmp[n] ^ ivec[n];
memcpy(ivec, tmp, SEED_BLOCK_SIZE);
}
}
}
