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/*
* MGF1
* (C) 1999-2007 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/mgf1.h>
#include <botan/hash.h>
#include <algorithm>
namespace Botan {
void mgf1_mask(HashFunction& hash,
const uint8_t in[], size_t in_len,
uint8_t out[], size_t out_len)
{
uint32_t counter = 0;
secure_vector<uint8_t> buffer(hash.output_length());
while(out_len)
{
hash.update(in, in_len);
hash.update_be(counter);
hash.final(buffer.data());
const size_t xored = std::min<size_t>(buffer.size(), out_len);
xor_buf(out, buffer.data(), xored);
out += xored;
out_len -= xored;
++counter;
}
}
}