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I2P: End-to-End encrypted and anonymous Internet
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61 lines
1.7 KiB
61 lines
1.7 KiB
11 years ago
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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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