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86 lines
1.8 KiB
86 lines
1.8 KiB
// hmac.cpp - written and placed in the public domain by Wei Dai |
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#include "pch.h" |
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#ifndef CRYPTOPP_IMPORTS |
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#include "hmac.h" |
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NAMESPACE_BEGIN(CryptoPP) |
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void HMAC_Base::UncheckedSetKey(const byte *userKey, unsigned int keylength, const NameValuePairs &) |
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{ |
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AssertValidKeyLength(keylength); |
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Restart(); |
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HashTransformation &hash = AccessHash(); |
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unsigned int blockSize = hash.BlockSize(); |
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if (!blockSize) |
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throw InvalidArgument("HMAC: can only be used with a block-based hash function"); |
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m_buf.resize(2*AccessHash().BlockSize() + AccessHash().DigestSize()); |
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if (keylength <= blockSize) |
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memcpy(AccessIpad(), userKey, keylength); |
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else |
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{ |
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AccessHash().CalculateDigest(AccessIpad(), userKey, keylength); |
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keylength = hash.DigestSize(); |
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} |
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assert(keylength <= blockSize); |
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memset(AccessIpad()+keylength, 0, blockSize-keylength); |
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for (unsigned int i=0; i<blockSize; i++) |
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{ |
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AccessOpad()[i] = AccessIpad()[i] ^ 0x5c; |
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AccessIpad()[i] ^= 0x36; |
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} |
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} |
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void HMAC_Base::KeyInnerHash() |
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{ |
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assert(!m_innerHashKeyed); |
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HashTransformation &hash = AccessHash(); |
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hash.Update(AccessIpad(), hash.BlockSize()); |
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m_innerHashKeyed = true; |
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} |
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void HMAC_Base::Restart() |
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{ |
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if (m_innerHashKeyed) |
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{ |
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AccessHash().Restart(); |
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m_innerHashKeyed = false; |
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} |
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} |
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void HMAC_Base::Update(const byte *input, size_t length) |
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{ |
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if (!m_innerHashKeyed) |
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KeyInnerHash(); |
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AccessHash().Update(input, length); |
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} |
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void HMAC_Base::TruncatedFinal(byte *mac, size_t size) |
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{ |
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ThrowIfInvalidTruncatedSize(size); |
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HashTransformation &hash = AccessHash(); |
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if (!m_innerHashKeyed) |
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KeyInnerHash(); |
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hash.Final(AccessInnerHash()); |
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hash.Update(AccessOpad(), hash.BlockSize()); |
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hash.Update(AccessInnerHash(), hash.DigestSize()); |
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hash.TruncatedFinal(mac, size); |
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m_innerHashKeyed = false; |
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} |
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NAMESPACE_END |
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#endif
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