int scryptdec_buf_saltlen()

in lib/scryptenc/scryptenc.c [149:179]

• 24 lines of code
• 4 McCabe index (conditional complexity)

  int scryptdec_buf_saltlen(const uint8_t * inbuf, size_t inbuflen,
							uint8_t * outbuf, const uint8_t * passwd,
							size_t passwdlen, const uint8_t * salt,
							size_t saltlen, uint32_t rounds, uint32_t memcost)
{
  uint8_t dk[64];
  uint8_t * key_enc = dk;
  int rc;
  struct crypto_aes_key * key_enc_exp;
  struct crypto_aesctr * AES;

  uint32_t p = 1;
  uint64_t N = (uint64_t)(1) << memcost;
  if ((rc = crypto_scrypt(passwd, passwdlen, salt, saltlen, N, rounds, p, dk, 64)) != 0)
	return rc;

  /* Decrypt data. */
	if ((key_enc_exp = crypto_aes_key_expand(key_enc, 32)) == NULL)
		return (5);
	if ((AES = crypto_aesctr_init(key_enc_exp, 0)) == NULL)
		return (6);
	crypto_aesctr_stream(AES, &inbuf[0], outbuf, inbuflen);
	crypto_aesctr_free(AES);
	crypto_aes_key_free(key_enc_exp);

	/* Zero sensitive data. */
	insecure_memzero(dk, 64);

	/* Success! */
	return (0);
}