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AEAD/Chacha20/Poly1305 encryption

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orignal 2018-06-13 11:41:46 -04:00
parent bf1e1ad457
commit df60e78766
5 changed files with 52 additions and 10 deletions
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29
libi2pd/Crypto.cpp
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@ -8,6 +8,9 @@
#include <openssl/crypto.h>
#include "TunnelBase.h"
#include <openssl/ssl.h>
#include "I2PEndian.h"
#include "ChaCha20.h"
#include "Poly1305.h"
#include "Log.h"
#include "Crypto.h"
@ -1057,6 +1060,32 @@ namespace crypto
}
}
// AEAD/ChaCha20/Poly1305
size_t AEADChaCha20Poly1305Encrypt (const uint8_t * msg, size_t msgLen, const uint8_t * ad, size_t adLen, const uint8_t * key, const uint8_t * nonce, uint8_t * buf, size_t len)
{
if (msgLen + 16 < len) return 0;
// generate one time poly key
uint8_t polyKey[64];
memset(polyKey, 0, sizeof(polyKey));
chacha20 (polyKey, 64, nonce, key, 0);
// encrypt data
memcpy (buf, msg, msgLen);
chacha20 (buf, msgLen, nonce, key, 1);
// create Poly1305 message
std::vector<uint8_t> polyMsg(adLen + msgLen + 16);
size_t offset = 0;
memcpy (polyMsg.data (), ad, adLen); offset += adLen;
memcpy (polyMsg.data () + offset, buf, msgLen); offset += msgLen; // encrypted data
htole64buf (polyMsg.data () + offset, adLen); offset += 8;
htole64buf (polyMsg.data () + offset, msgLen); offset += 8;
// calculate Poly1305 tag and write in after encrypted data
Poly1305HMAC ((uint32_t *)(buf + msgLen), (uint32_t *)key, polyMsg.data (), offset);
return msgLen + 16;
}
// init and terminate
/* std::vector <std::unique_ptr<std::mutex> > m_OpenSSLMutexes;
static void OpensslLockingCallback(int mode, int type, const char * file, int line)
{