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use same buffer for input and output for AEAD/Chacha20/Poly1305

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orignal
2018-08-09 15:47:02 -04:00
parent 88e87d589b
commit f7e4afc282
2 changed files with 16 additions and 8 deletions
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18
libi2pd/Crypto.cpp
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@@ -1018,9 +1018,6 @@ namespace crypto
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
if (!ad) adLen = 0;
@@ -1038,7 +1035,20 @@ namespace crypto
memcpy (polyMsg.data () + offset, padding, rem); offset += rem;
}
}
memcpy (polyMsg.data () + offset, encrypt ? buf : msg, msgLen); offset += msgLen; // encrypted data
// encrypt/decrypt data and add to hash
memcpy (buf, msg, msgLen);
if (encrypt)
{
chacha20 (buf, msgLen, nonce, key, 1); // encrypt
memcpy (polyMsg.data () + offset, buf, msgLen); // after encryption
}
else
{
memcpy (polyMsg.data () + offset, buf, msgLen); // before decryption
chacha20 (buf, msgLen, nonce, key, 1); // decrypt
}
offset += msgLen; // encrypted data
auto rem = msgLen & 0x0F; // %16
if (rem)
{