mirror of
https://github.com/PurpleI2P/i2pd.git
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62 lines
1.4 KiB
C++
62 lines
1.4 KiB
C++
#ifndef HMAC_H__
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#define HMAC_H__
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#include <inttypes.h>
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#include <string.h>
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#define CRYPTOPP_ENABLE_NAMESPACE_WEAK 1
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#include <cryptopp/md5.h>
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#include "Identity.h"
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namespace i2p
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{
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namespace crypto
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{
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const uint64_t IPAD = 0x3636363636363636;
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const uint64_t OPAD = 0x5C5C5C5C5C5C5C5C;
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typedef i2p::data::Tag<32> MACKey;
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inline void HMACMD5Digest (uint8_t * msg, size_t len, const MACKey& key, uint8_t * digest)
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// key is 32 bytes
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// digest is 16 bytes
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// block size is 64 bytes
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{
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uint64_t buf[256];
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// ikeypad
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buf[0] = key.GetLL ()[0] ^ IPAD;
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buf[1] = key.GetLL ()[1] ^ IPAD;
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buf[2] = key.GetLL ()[2] ^ IPAD;
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buf[3] = key.GetLL ()[3] ^ IPAD;
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buf[4] = IPAD;
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buf[5] = IPAD;
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buf[6] = IPAD;
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buf[7] = IPAD;
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// concatenate with msg
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memcpy (buf + 8, msg, len);
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// calculate first hash
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uint8_t hash[16]; // MD5
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CryptoPP::Weak1::MD5().CalculateDigest (hash, (uint8_t *)buf, len + 64);
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// okeypad
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buf[0] = key.GetLL ()[0] ^ OPAD;
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buf[1] = key.GetLL ()[1] ^ OPAD;
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buf[2] = key.GetLL ()[2] ^ OPAD;
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buf[3] = key.GetLL ()[3] ^ OPAD;
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buf[4] = OPAD;
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buf[5] = OPAD;
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buf[6] = OPAD;
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buf[7] = OPAD;
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// copy first hash after okeypad
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memcpy (buf + 8, hash, 16);
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// fill next 16 bytes with zeros (first hash size assumed 32 bytes in I2P)
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memset (buf + 10, 0, 16);
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// calculate digest
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CryptoPP::Weak1::MD5().CalculateDigest (digest, (uint8_t *)buf, 96);
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}
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}
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}
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#endif
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