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8-bytes alignment

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orignal 2014-05-07 19:44:43 -04:00
parent 83131a361d
commit 6ba472eee7
1 changed files with 22 additions and 22 deletions
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44
hmac.h
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@ -18,38 +18,38 @@ namespace crypto
// digest is 16 bytes
// block size is 64 bytes
{
uint8_t buf[2048];
uint64_t buf[256];
// ikeypad
((uint64_t *)buf)[0] = ((uint64_t *)key)[0] ^ IPAD;
((uint64_t *)buf)[1] = ((uint64_t *)key)[1] ^ IPAD;
((uint64_t *)buf)[2] = ((uint64_t *)key)[2] ^ IPAD;
((uint64_t *)buf)[3] = ((uint64_t *)key)[3] ^ IPAD;
((uint64_t *)buf)[4] = IPAD;
((uint64_t *)buf)[5] = IPAD;
((uint64_t *)buf)[6] = IPAD;
((uint64_t *)buf)[7] = IPAD;
buf[0] = ((uint64_t *)key)[0] ^ IPAD;
buf[1] = ((uint64_t *)key)[1] ^ IPAD;
buf[2] = ((uint64_t *)key)[2] ^ IPAD;
buf[3] = ((uint64_t *)key)[3] ^ IPAD;
buf[4] = IPAD;
buf[5] = IPAD;
buf[6] = IPAD;
buf[7] = IPAD;
// concatenate with msg
memcpy (buf + 64, msg, len);
memcpy (buf + 8, msg, len);
// calculate first hash
uint8_t hash[16]; // MD5
CryptoPP::Weak1::MD5().CalculateDigest (hash, buf, len + 64);
CryptoPP::Weak1::MD5().CalculateDigest (hash, (uint8_t *)buf, len + 64);
// okeypad
((uint64_t *)buf)[0] = ((uint64_t *)key)[0] ^ OPAD;
((uint64_t *)buf)[1] = ((uint64_t *)key)[1] ^ OPAD;
((uint64_t *)buf)[2] = ((uint64_t *)key)[2] ^ OPAD;
((uint64_t *)buf)[3] = ((uint64_t *)key)[3] ^ OPAD;
((uint64_t *)buf)[4] = OPAD;
((uint64_t *)buf)[5] = OPAD;
((uint64_t *)buf)[6] = OPAD;
((uint64_t *)buf)[7] = OPAD;
buf[0] = ((uint64_t *)key)[0] ^ OPAD;
buf[1] = ((uint64_t *)key)[1] ^ OPAD;
buf[2] = ((uint64_t *)key)[2] ^ OPAD;
buf[3] = ((uint64_t *)key)[3] ^ OPAD;
buf[4] = OPAD;
buf[5] = OPAD;
buf[6] = OPAD;
buf[7] = OPAD;
// copy first hash after okeypad
memcpy (buf + 64, hash, 16);
memcpy (buf + 8, hash, 16);
// fill next 16 bytes with zeros (first hash size assumed 32 bytes in I2P)
memset (buf + 80, 0, 16);
memset (buf + 10, 0, 16);
// calculate digest
CryptoPP::Weak1::MD5().CalculateDigest (digest, buf, 96);
CryptoPP::Weak1::MD5().CalculateDigest (digest, (uint8_t *)buf, 96);
}
}
}