- tmp[n] = ivec[n];
- AES_encrypt(tmp, tmp, key);
- memcpy(out, tmp, len);
- memcpy(ivec, tmp, AES_BLOCK_SIZE);
- }
+ out[n] = iv[n];
+ AES_encrypt(out, out, key);
+ iv = out;
+ }
+ memcpy(ivec,iv,AES_BLOCK_SIZE);
+ } else if (in != out) {
+ while (len >= AES_BLOCK_SIZE) {
+ AES_decrypt(in, out, key);
+ for(n=0; n < AES_BLOCK_SIZE; ++n)
+ out[n] ^= iv[n];
+ iv = in;
+ len -= AES_BLOCK_SIZE;
+ in += AES_BLOCK_SIZE;
+ out += AES_BLOCK_SIZE;
+ }
+ if (len) {
+ AES_decrypt(in,tmp,key);
+ for(n=0; n < len; ++n)
+ out[n] = tmp[n] ^ iv[n];
+ iv = in;
+ }
+ memcpy(ivec,iv,AES_BLOCK_SIZE);