Botan 2.19.5 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/mgf1.h>
9#include <botan/hash.h>
10#include <algorithm>
11
12 namespace Botan {
13
14 void mgf1_mask(HashFunction& hash,
15 const uint8_t in[], size_t in_len,
16 uint8_t out[], size_t out_len)
17 {
18 uint32_t counter = 0;
19
20 secure_vector<uint8_t> buffer(hash.output_length());
21 while(out_len)
22 {
23 hash.update(in, in_len);
24 hash.update_be(counter);
25 hash.final(buffer.data());
26
27 const size_t xored = std::min<size_t>(buffer.size(), out_len);
28 xor_buf(out, buffer.data(), xored);
29 out += xored;
30 out_len -= xored;
31
32 ++counter;
33 }
34 }
35
36}
Botan::HashFunction
Definition: hash.h:21
Botan
Definition: alg_id.cpp:13
Botan::mgf1_mask
void mgf1_mask(HashFunction &hash, const uint8_t in[], size_t in_len, uint8_t out[], size_t out_len)
Definition: mgf1.cpp:14
Botan::xor_buf
void xor_buf(uint8_t out[], const uint8_t in[], size_t length)
Definition: mem_ops.h:262
Botan::secure_vector
std::vector< T, secure_allocator< T > > secure_vector
Definition: secmem.h:65
hash
MechanismType hash
Definition: p11_mechanism.cpp:64