/**
Encrypt (or decrypt) bytes of ciphertext (or plaintext) with RC4
@param key The key
@param keylen The key length
@param datain The plaintext (or ciphertext)
@param datalen The length of the input and output (octets)
@param dataout [out] The ciphertext (or plaintext)
@return CRYPT_OK if successful
*/
int rc4_stream_memory(const unsigned char *key, unsigned long keylen,
const unsigned char *datain, unsigned long datalen,
unsigned char *dataout)
{
rc4_state st;
int err;
if ((err = rc4_stream_setup(&st, key, keylen)) != CRYPT_OK) goto WIPE_KEY;
err = rc4_stream_crypt(&st, datain, datalen, dataout);
WIPE_KEY:
rc4_stream_done(&st);
return err;
}
int rc4_stream_test(void)
{
#ifndef LTC_TEST
return CRYPT_NOP;
#else
rc4_state st;
int err;
const unsigned char key[] = { 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef };
const unsigned char pt[] = { 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef };
const unsigned char ct[] = { 0x75, 0xb7, 0x87, 0x80, 0x99, 0xe0, 0xc5, 0x96 };
unsigned char buf[10];
if ((err = rc4_stream_setup(&st, key, sizeof(key))) != CRYPT_OK) return err;
if ((err = rc4_stream_crypt(&st, pt, sizeof(pt), buf)) != CRYPT_OK) return err;
if (compare_testvector(buf, sizeof(ct), ct, sizeof(ct), "RC4", 0)) return CRYPT_FAIL_TESTVECTOR;
if ((err = rc4_stream_done(&st)) != CRYPT_OK) return err;
return CRYPT_OK;
#endif
}