You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
90 lines
2.0 KiB
90 lines
2.0 KiB
// hmac.cpp - originally written and placed in the public domain by Wei Dai |
|
|
|
#include "pch.h" |
|
|
|
#ifndef CRYPTOPP_IMPORTS |
|
|
|
#include "hmac.h" |
|
|
|
NAMESPACE_BEGIN(CryptoPP) |
|
|
|
void HMAC_Base::UncheckedSetKey(const byte *userKey, unsigned int keylength, const NameValuePairs &) |
|
{ |
|
AssertValidKeyLength(keylength); |
|
|
|
Restart(); |
|
|
|
HashTransformation &hash = AccessHash(); |
|
unsigned int blockSize = hash.BlockSize(); |
|
|
|
if (!blockSize) |
|
throw InvalidArgument("HMAC: can only be used with a block-based hash function"); |
|
|
|
m_buf.resize(2*AccessHash().BlockSize() + AccessHash().DigestSize()); |
|
|
|
if (keylength <= blockSize) |
|
{ |
|
// hmac.cpp:26:9: runtime error: null pointer passed as argument 2 |
|
if (AccessIpad() && userKey && keylength) |
|
memcpy(AccessIpad(), userKey, keylength); |
|
} |
|
else |
|
{ |
|
AccessHash().CalculateDigest(AccessIpad(), userKey, keylength); |
|
keylength = hash.DigestSize(); |
|
} |
|
|
|
CRYPTOPP_ASSERT(keylength <= blockSize); |
|
memset(AccessIpad()+keylength, 0, blockSize-keylength); |
|
|
|
for (unsigned int i=0; i<blockSize; i++) |
|
{ |
|
AccessOpad()[i] = AccessIpad()[i] ^ 0x5c; |
|
AccessIpad()[i] ^= 0x36; |
|
} |
|
} |
|
|
|
void HMAC_Base::KeyInnerHash() |
|
{ |
|
CRYPTOPP_ASSERT(!m_innerHashKeyed); |
|
HashTransformation &hash = AccessHash(); |
|
hash.Update(AccessIpad(), hash.BlockSize()); |
|
m_innerHashKeyed = true; |
|
} |
|
|
|
void HMAC_Base::Restart() |
|
{ |
|
if (m_innerHashKeyed) |
|
{ |
|
AccessHash().Restart(); |
|
m_innerHashKeyed = false; |
|
} |
|
} |
|
|
|
void HMAC_Base::Update(const byte *input, size_t length) |
|
{ |
|
if (!m_innerHashKeyed) |
|
KeyInnerHash(); |
|
AccessHash().Update(input, length); |
|
} |
|
|
|
void HMAC_Base::TruncatedFinal(byte *mac, size_t size) |
|
{ |
|
ThrowIfInvalidTruncatedSize(size); |
|
|
|
HashTransformation &hash = AccessHash(); |
|
|
|
if (!m_innerHashKeyed) |
|
KeyInnerHash(); |
|
hash.Final(AccessInnerHash()); |
|
|
|
hash.Update(AccessOpad(), hash.BlockSize()); |
|
hash.Update(AccessInnerHash(), hash.DigestSize()); |
|
hash.TruncatedFinal(mac, size); |
|
|
|
m_innerHashKeyed = false; |
|
} |
|
|
|
NAMESPACE_END |
|
|
|
#endif
|
|
|