Exemple #1
0
/*
	Psuedo-random function.  TLS uses this for key generation and hashing
*/
int32_t prf(const unsigned char *sec, uint16_t secLen,
				const unsigned char *seed, uint16_t seedLen,
				unsigned char *out, uint16_t outLen)
{
	const unsigned char	*s1, *s2;
	unsigned char	md5out[SSL_MAX_KEY_BLOCK_SIZE];
	unsigned char	sha1out[SSL_MAX_KEY_BLOCK_SIZE];
	int32_t			rc = PS_FAIL;
	uint16_t		sLen, i;

	psAssert(outLen <= SSL_MAX_KEY_BLOCK_SIZE);

	sLen = (secLen / 2) + (secLen % 2);
	s1 = sec;
	s2 = (sec + sLen) - (secLen % 2);
	if ((rc = pMd5(s1, sLen, seed, seedLen, md5out, outLen)) < 0) {
		goto L_RETURN;
	}
	if ((rc = pSha1(s2, sLen, seed, seedLen, sha1out, outLen)) < 0) {
		goto L_RETURN;
	}
	for (i = 0; i < outLen; i++) {
		out[i] = md5out[i] ^ sha1out[i];
	}
	rc = outLen;
L_RETURN:
	memzero_s(md5out, SSL_MAX_KEY_BLOCK_SIZE);
	memzero_s(sha1out, SSL_MAX_KEY_BLOCK_SIZE);
	return rc;
}
Exemple #2
0
Fichier : tls.c Projet : B-Rich/NUL
/*
	Psuedo-random function.  TLS uses this for key generation and hashing
*/
static int32 prf(unsigned char *sec, uint32 secLen, unsigned char *seed,
			   uint32 seedLen, unsigned char *out, uint32 outLen)
{
	unsigned char	*s1, *s2;
	unsigned char	md5out[SSL_MAX_KEY_BLOCK_SIZE];
	unsigned char	sha1out[SSL_MAX_KEY_BLOCK_SIZE];
	uint32			sLen, i;

	psAssert(outLen <= SSL_MAX_KEY_BLOCK_SIZE);

	sLen = (secLen / 2) + (secLen % 2);
	s1 = sec;
	s2 = (sec + sLen) - (secLen % 2);
	pMd5(s1, sLen, seed, seedLen, md5out, outLen);
	pSha1(s2, sLen, seed, seedLen, sha1out, outLen);
	for (i = 0; i < outLen; i++) {
		out[i] = md5out[i] ^ sha1out[i];
	}
	return outLen;
}