/*
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;
}
/*
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;
}
