/*
* SSL3 PRF
*/
SecureVector<byte> SSL3_PRF::derive(size_t key_len,
const byte secret[], size_t secret_len,
const byte seed[], size_t seed_len) const
{
if(key_len > 416)
throw Invalid_Argument("SSL3_PRF: Requested key length is too large");
MD5 md5;
SHA_160 sha1;
OctetString output;
int counter = 0;
while(key_len)
{
const size_t produce = std::min<size_t>(key_len, md5.output_length());
output = output + next_hash(counter++, produce, md5, sha1,
secret, secret_len, seed, seed_len);
key_len -= produce;
}
return output.bits_of();
}
/*
* Append Operation for OctetStrings
*/
OctetString operator+(const OctetString& k1, const OctetString& k2)
{
secure_vector<uint8_t> out;
out += k1.bits_of();
out += k2.bits_of();
return OctetString(out);
}
/*
* SSL3 PRF
*/
SecureVector<byte> SSL3_PRF::derive(u32bit key_len,
const byte secret[], u32bit secret_len,
const byte seed[], u32bit seed_len) const
{
if(key_len > 416)
throw Internal_Error("SSL3_PRF: Requested key length is too large");
MD5 md5;
SHA_160 sha1;
OctetString output;
int counter = 0;
while(key_len)
{
const u32bit produce = std::min(key_len, md5.OUTPUT_LENGTH);
output = output + next_hash(counter++, produce, md5, sha1,
secret, secret_len, seed, seed_len);
key_len -= produce;
}
return output.bits_of();
}
/*
* XOR Operation for OctetStrings
*/
OctetString operator^(const OctetString& k1, const OctetString& k2)
{
secure_vector<uint8_t> out(std::max(k1.length(), k2.length()));
copy_mem(out.data(), k1.begin(), k1.length());
xor_buf(out.data(), k2.begin(), k2.length());
return OctetString(out);
}
/*
* Equality Operation for OctetStrings
*/
bool operator==(const OctetString& s1, const OctetString& s2)
{
return (s1.bits_of() == s2.bits_of());
}