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AEAD/Chacha20/Poly1305 encrypt multiple buffers

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orignal 2018-11-30 14:41:14 -05:00
parent 0c9ebc36d4
commit e68f1dbc99
5 changed files with 130 additions and 69 deletions
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49
libi2pd/Crypto.cpp
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@ -1172,6 +1172,55 @@ namespace crypto
return ret;
}
void AEADChaCha20Poly1305Encrypt (std::vector<std::pair<void*, std::size_t> >& bufs, const uint8_t * key, const uint8_t * nonce, uint8_t * mac)
{
if (bufs.empty ()) return;
#if LEGACY_OPENSSL
// generate one time poly key
uint64_t polyKey[8];
memset(polyKey, 0, sizeof(polyKey));
chacha20 ((uint8_t *)polyKey, 64, nonce, key, 0);
Poly1305 polyHash (polyKey);
// encrypt buffers
Chacha20State state;
Chacha20Init (state, nonce, key, 1);
size_t size = 0;
for (auto& it: bufs)
{
Chacha20Encrypt (state, (uint8_t *)it.first, it.second);
polyHash.Update ((uint8_t *)it.first, it.second); // after encryption
size += it.second;
}
// padding
uint8_t padding[16];
memset (padding, 0, 16);
auto rem = size & 0x0F; // %16
if (rem)
{
// padding2
rem = 16 - rem;
polyHash.Update (padding, rem);
}
// adLen and msgLen
// adLen is always zero
htole64buf (padding + 8, size);
polyHash.Update (padding, 16);
// MAC
polyHash.Finish ((uint64_t *)mac);
#else
int outlen = 0;
EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new ();
EVP_EncryptInit_ex(ctx, EVP_chacha20_poly1305(), 0, 0, 0);
EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_SET_IVLEN, 12, 0);
EVP_EncryptInit_ex(ctx, NULL, NULL, key, nonce);
for (auto& it: bufs)
EVP_EncryptUpdate(ctx, (uint8_t *)it.first, &outlen, (uint8_t *)it.first, it.second);
EVP_EncryptFinal_ex(ctx, NULL, &outlen);
EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_GET_TAG, 16, mac);
EVP_CIPHER_CTX_free (ctx);
#endif
}
// init and terminate
/* std::vector <std::unique_ptr<std::mutex> > m_OpenSSLMutexes;