mirror of https://github.com/PurpleI2P/i2pd.git
orignal
11 years ago
1 changed files with 60 additions and 0 deletions
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#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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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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inline void HMACMD5Digest (uint8_t * msg, size_t len, uint8_t * 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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size_t totalLen = len + 64 + 32; |
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uint8_t * buf = new uint8_t[totalLen]; // TODO: reuse buffers
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// ikeypad
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((uint64_t *)buf)[0] = ((uint64_t *)key)[0] ^ IPAD; |
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((uint64_t *)buf)[1] = ((uint64_t *)key)[1] ^ IPAD; |
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((uint64_t *)buf)[2] = ((uint64_t *)key)[2] ^ IPAD; |
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((uint64_t *)buf)[3] = ((uint64_t *)key)[3] ^ IPAD; |
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((uint64_t *)buf)[4] = IPAD; |
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((uint64_t *)buf)[5] = IPAD; |
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((uint64_t *)buf)[6] = IPAD; |
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((uint64_t *)buf)[7] = IPAD; |
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// concatenate with msg
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memcpy (buf + 64, 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, buf, len + 64); |
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// okeypad
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((uint64_t *)buf)[0] = ((uint64_t *)key)[0] ^ OPAD; |
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((uint64_t *)buf)[1] = ((uint64_t *)key)[1] ^ OPAD; |
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((uint64_t *)buf)[2] = ((uint64_t *)key)[2] ^ OPAD; |
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((uint64_t *)buf)[3] = ((uint64_t *)key)[3] ^ OPAD; |
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((uint64_t *)buf)[4] = OPAD; |
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((uint64_t *)buf)[5] = OPAD; |
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((uint64_t *)buf)[6] = OPAD; |
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((uint64_t *)buf)[7] = OPAD; |
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// copy first hash after okeypad
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memcpy (buf + 64, 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 + 72, 0, 16); |
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// calculate digest
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CryptoPP::Weak1::MD5().CalculateDigest (digest, buf, totalLen); |
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delete[] buf; |
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} |
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} |
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} |
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#endif |
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