Botan 3.3.0
Crypto and TLS for C&
mgf1.cpp
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1/*
2* MGF1
3* (C) 1999-2007 Jack Lloyd
4*
5* Botan is released under the Simplified BSD License (see license.txt)
6*/
7
8#include <botan/internal/mgf1.h>
9
10#include <botan/hash.h>
11#include <algorithm>
12
13namespace Botan {
14
15void mgf1_mask(HashFunction& hash, const uint8_t in[], size_t in_len, uint8_t out[], size_t out_len) {
16 uint32_t counter = 0;
17
18 std::vector<uint8_t> buffer(hash.output_length());
19 while(out_len) {
20 hash.update(in, in_len);
21 hash.update_be(counter);
22 hash.final(buffer.data());
23
24 const size_t xored = std::min<size_t>(buffer.size(), out_len);
25 xor_buf(out, buffer.data(), xored);
26 out += xored;
27 out_len -= xored;
28
29 ++counter;
30 }
31}
32
33} // namespace Botan
void update(const uint8_t in[], size_t length)
Definition buf_comp.h:35
virtual size_t output_length() const =0
void update_be(uint16_t val)
Definition buf_comp.cpp:13
void final(uint8_t out[])
Definition buf_comp.h:70
void mgf1_mask(HashFunction &hash, const uint8_t in[], size_t in_len, uint8_t out[], size_t out_len)
Definition mgf1.cpp:15
constexpr void xor_buf(ranges::contiguous_output_range< uint8_t > auto &&out, ranges::contiguous_range< uint8_t > auto &&in)
Definition mem_ops.h:340