Hi Jimmy,
RFC-2246 is for TLS v1. However, i am going for SSL v3. I
don't know whether there is any function for the same. I went through
ssl3_enc.c in openssl code:
int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
int len)
{
static const unsigned char *salt[3]={
#ifndef CHARSET_EBCDIC
(const unsigned char *)"A",
(const unsigned char *)"BB",
(const unsigned char *)"CCC",
#else
(const unsigned char *)"\x41",
(const unsigned char *)"\x42\x42",
(const unsigned char *)"\x43\x43\x43",
#endif
};
unsigned char buf[EVP_MAX_MD_SIZE];
EVP_MD_CTX ctx;
int i,ret=0;
unsigned int n;
EVP_MD_CTX_init(&ctx);
for (i=0; i<3; i++)
{
EVP_DigestInit_ex(&ctx,s->ctx->sha1, NULL);
EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i]));
EVP_DigestUpdate(&ctx,p,len);
EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]),
SSL3_RANDOM_SIZE);
EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]),
SSL3_RANDOM_SIZE);
EVP_DigestFinal_ex(&ctx,buf,&n);
EVP_DigestInit_ex(&ctx,s->ctx->md5, NULL);
EVP_DigestUpdate(&ctx,p,len);
EVP_DigestUpdate(&ctx,buf,n);
EVP_DigestFinal_ex(&ctx,out,&n);
out+=n;
ret+=n;
}
EVP_MD_CTX_cleanup(&ctx);
return(ret);
}
I guess *p above is pointer to premaster secret. I am doing the same thing
here, only that EVP_Digest_Update is replaced MD5_Update/SHA_Update. I am not
still sure whether my algorithm is correct or not!
Thanks and Regards,
Suchindra Chandrahas
jimmy bahuleyan <[EMAIL PROTECTED]> wrote: Suchindra Chandrahas wrote:
> Hi Jimmy,
> Yes i changed the no. of bytes to 32 (both client
> and server random). Also, is it ok to use openssl tls1_prf for ssl v3
> handshake?
>
if you only want to do the prf calculation tls1_PRF() does just that for
you. It does the PRF as specified in rfc-2246, if that is what you have
in mind tls1_PRF() should work.
-jb
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