public override bool Verify(ArraySegment <byte> signature, ArraySegment <byte> message, ArraySegment <byte> key)
{
if (signature.Array == null)
{
throw new ArgumentNullException("signature.Array");
}
if (message.Array == null)
{
throw new ArgumentNullException("message.Array");
}
if (key.Array == null)
{
throw new ArgumentNullException("key.Array");
}
if (key.Count != 32)
{
throw new ArgumentException("Invalid key size", "key");
}
if (signature.Count != 16)
{
throw new ArgumentException("Invalid signature size", "signature");
}
var tempBytes = new byte[16];//todo: remove allocation
ByteIntegerConverter.Array8LoadLittleEndian32(out Array8 <uint> internalKey, key.Array, key.Offset);
Poly1305Donna.poly1305_auth(tempBytes, 0, message.Array, message.Offset, message.Count, ref internalKey);
return(CryptoBytes.ConstantTimeEquals(new ArraySegment <byte>(tempBytes), signature));
}
public override bool Verify(byte[] signature, byte[] message, byte[] key)
{
if (signature == null)
{
throw new ArgumentNullException("signature");
}
if (message == null)
{
throw new ArgumentNullException("message");
}
if (key == null)
{
throw new ArgumentNullException("key");
}
if (signature.Length != 16)
{
throw new ArgumentException("Invalid signature size", "signature");
}
if (key.Length != 32)
{
throw new ArgumentException("Invalid key size", "key");
}
var tempBytes = new byte[16];//todo: remove allocation
ByteIntegerConverter.Array8LoadLittleEndian32(out Array8 <uint> internalKey, key, 0);
Poly1305Donna.poly1305_auth(tempBytes, 0, message, 0, message.Length, ref internalKey);
return(CryptoBytes.ConstantTimeEquals(tempBytes, signature));
}
public override void Sign(ArraySegment <byte> signature, ArraySegment <byte> message, ArraySegment <byte> key)
{
if (signature.Array == null)
{
throw new ArgumentNullException("signature.Array");
}
if (message.Array == null)
{
throw new ArgumentNullException("message.Array");
}
if (key.Array == null)
{
throw new ArgumentNullException("key.Array");
}
if (key.Count != 32)
{
throw new ArgumentException("Invalid key size", "key");
}
if (signature.Count != 16)
{
throw new ArgumentException("Invalid signature size", "signature");
}
ByteIntegerConverter.Array8LoadLittleEndian32(out var internalKey, key.Array, key.Offset);
Poly1305Donna.poly1305_auth(signature.Array, signature.Offset, message.Array, message.Offset, message.Count, ref internalKey);
}
private static void EncryptInternal(byte[] ciphertext, int ciphertextOffset, byte[] message, int messageOffset, int messageLength, byte[] key, int keyOffset, byte[] nonce, int nonceOffset)
{
Array16 <UInt32> internalKey;
PrepareInternalKey(out internalKey, key, keyOffset, nonce, nonceOffset);
Array16 <UInt32> temp;
var tempBytes = new byte[64];//todo: remove allocation
Array8 <UInt32> poly1305Key;
// first iteration
{
SalsaCore.Salsa(out temp, ref internalKey, 20);
//first half is for Poly1305
poly1305Key.x0 = temp.x0;
poly1305Key.x1 = temp.x1;
poly1305Key.x2 = temp.x2;
poly1305Key.x3 = temp.x3;
poly1305Key.x4 = temp.x4;
poly1305Key.x5 = temp.x5;
poly1305Key.x6 = temp.x6;
poly1305Key.x7 = temp.x7;
// second half for the message
ByteIntegerConverter.StoreLittleEndian32(tempBytes, 0, temp.x8);
ByteIntegerConverter.StoreLittleEndian32(tempBytes, 4, temp.x9);
ByteIntegerConverter.StoreLittleEndian32(tempBytes, 8, temp.x10);
ByteIntegerConverter.StoreLittleEndian32(tempBytes, 12, temp.x11);
ByteIntegerConverter.StoreLittleEndian32(tempBytes, 16, temp.x12);
ByteIntegerConverter.StoreLittleEndian32(tempBytes, 20, temp.x13);
ByteIntegerConverter.StoreLittleEndian32(tempBytes, 24, temp.x14);
ByteIntegerConverter.StoreLittleEndian32(tempBytes, 28, temp.x15);
int count = Math.Min(32, messageLength);
for (int i = 0; i < count; i++)
{
ciphertext[16 + ciphertextOffset + i] = (byte)(message[messageOffset + i] ^ tempBytes[i]);
}
}
// later iterations
int blockOffset = 32;
while (blockOffset < messageLength)
{
internalKey.x8++;
SalsaCore.Salsa(out temp, ref internalKey, 20);
ByteIntegerConverter.Array16StoreLittleEndian32(tempBytes, 0, ref temp);
int count = Math.Min(64, messageLength - blockOffset);
for (int i = 0; i < count; i++)
{
ciphertext[16 + ciphertextOffset + blockOffset + i] = (byte)(message[messageOffset + blockOffset + i] ^ tempBytes[i]);
}
blockOffset += 64;
}
// compute MAC
Poly1305Donna.poly1305_auth(ciphertext, ciphertextOffset, ciphertext, ciphertextOffset + 16, messageLength, ref poly1305Key);
}
public override byte[] Sign(byte[] message, byte[] key)
{
if (message == null)
{
throw new ArgumentNullException("message");
}
if (key == null)
{
throw new ArgumentNullException("key");
}
if (key.Length != 32)
{
throw new ArgumentException("Invalid key size", "key");
}
var result = new byte[16];
ByteIntegerConverter.Array8LoadLittleEndian32(out var internalKey, key, 0);
Poly1305Donna.poly1305_auth(result, 0, message, 0, message.Length, ref internalKey);
return(result);
}
private static bool DecryptInternal(byte[] plaintext, int plaintextOffset, byte[] ciphertext,
int ciphertextOffset, int ciphertextLength, byte[] key, int keyOffset, byte[] nonce, int nonceOffset)
{
int plaintextLength = ciphertextLength - MacSizeInBytes;
Array16 <uint> internalKey;
PrepareInternalKey(out internalKey, key, keyOffset, nonce, nonceOffset);
Array16 <uint> temp;
byte[] tempBytes = new byte[64]; //todo: remove allocation
// first iteration
{
SalsaCore.HSalsa(out temp, ref internalKey, 20);
//first half is for Poly1305
Array8 <uint> poly1305Key;
poly1305Key.x0 = temp.x0;
poly1305Key.x1 = temp.x1;
poly1305Key.x2 = temp.x2;
poly1305Key.x3 = temp.x3;
poly1305Key.x4 = temp.x4;
poly1305Key.x5 = temp.x5;
poly1305Key.x6 = temp.x6;
poly1305Key.x7 = temp.x7;
// compute MAC
Poly1305Donna.poly1305_auth(tempBytes, 0, ciphertext, ciphertextOffset + 16, plaintextLength,
ref poly1305Key);
if (!CryptoBytes.ConstantTimeEquals(tempBytes, 0, ciphertext, ciphertextOffset, MacSizeInBytes))
{
Array.Clear(plaintext, plaintextOffset, plaintextLength);
return(false);
}
// rest for the message
ByteIntegerConverter.StoreLittleEndian32(tempBytes, 0, temp.x8);
ByteIntegerConverter.StoreLittleEndian32(tempBytes, 4, temp.x9);
ByteIntegerConverter.StoreLittleEndian32(tempBytes, 8, temp.x10);
ByteIntegerConverter.StoreLittleEndian32(tempBytes, 12, temp.x11);
ByteIntegerConverter.StoreLittleEndian32(tempBytes, 16, temp.x12);
ByteIntegerConverter.StoreLittleEndian32(tempBytes, 20, temp.x13);
ByteIntegerConverter.StoreLittleEndian32(tempBytes, 24, temp.x14);
ByteIntegerConverter.StoreLittleEndian32(tempBytes, 28, temp.x15);
int count = Math.Min(32, plaintextLength);
for (int i = 0; i < count; i++)
{
plaintext[plaintextOffset + i] =
(byte)(ciphertext[MacSizeInBytes + ciphertextOffset + i] ^ tempBytes[i]);
}
}
// later iterations
int blockOffset = 32;
while (blockOffset < plaintextLength)
{
internalKey.x8++;
SalsaCore.HSalsa(out temp, ref internalKey, 20);
ByteIntegerConverter.Array16StoreLittleEndian32(tempBytes, 0, ref temp);
int count = Math.Min(64, plaintextLength - blockOffset);
for (int i = 0; i < count; i++)
{
plaintext[plaintextOffset + blockOffset + i] =
(byte)(ciphertext[16 + ciphertextOffset + blockOffset + i] ^ tempBytes[i]);
}
blockOffset += 64;
}
return(true);
}
private static bool DecryptInternal(byte[] plaintext, int plaintextOffset, byte[] ciphertext, int ciphertextOffset, int ciphertextLength, byte[] key, int keyOffset, byte[] nonce, int nonceOffset)
{
int plaintextLength = ciphertextLength - MacSizeInBytes;
Array16\\ internalKey;
PrepareInternalKey(out internalKey, key, keyOffset, nonce, nonceOffset);
Array16\\ temp;
var tempBytes = new byte[64];//todo: remove allocation
// first iteration
{
SalsaCore.Salsa(out temp, ref internalKey, 20);
//first half is for Poly1305
Array8\\ poly1305Key;
poly1305Key.x0 = temp.x0;
poly1305Key.x1 = temp.x1;
poly1305Key.x2 = temp.x2;
poly1305Key.x3 = temp.x3;
poly1305Key.x4 = temp.x4;
poly1305Key.x5 = temp.x5;
poly1305Key.x6 = temp.x6;
poly1305Key.x7 = temp.x7;
// compute MAC
Poly1305Donna.poly1305_auth(tempBytes, 0, ciphertext, ciphertextOffset + 16, plaintextLength, ref poly1305Key);
if (!CryptoBytes.ConstantTimeEquals(tempBytes, 0, ciphertext, ciphertextOffset, MacSizeInBytes))
{
Array.Clear(plaintext, plaintextOffset, plaintextLength);
return false;
}
// rest for the message
ByteIntegerConverter.StoreLittleEndian32(tempBytes, 0, temp.x8);
ByteIntegerConverter.StoreLittleEndian32(tempBytes, 4, temp.x9);
ByteIntegerConverter.StoreLittleEndian32(tempBytes, 8, temp.x10);
ByteIntegerConverter.StoreLittleEndian32(tempBytes, 12, temp.x11);
ByteIntegerConverter.StoreLittleEndian32(tempBytes, 16, temp.x12);
ByteIntegerConverter.StoreLittleEndian32(tempBytes, 20, temp.x13);
ByteIntegerConverter.StoreLittleEndian32(tempBytes, 24, temp.x14);
ByteIntegerConverter.StoreLittleEndian32(tempBytes, 28, temp.x15);
int count = Math.Min(32, plaintextLength);
for (int i = 0; i \\ internalKey;
PrepareInternalKey(out internalKey, key, keyOffset, nonce, nonceOffset);
Array16\\ temp;
var tempBytes = new byte[64];//todo: remove allocation
Array8\\ poly1305Key;
// first iteration
{
SalsaCore.Salsa(out temp, ref internalKey, 20);
//first half is for Poly1305
poly1305Key.x0 = temp.x0;
poly1305Key.x1 = temp.x1;
poly1305Key.x2 = temp.x2;
poly1305Key.x3 = temp.x3;
poly1305Key.x4 = temp.x4;
poly1305Key.x5 = temp.x5;
poly1305Key.x6 = temp.x6;
poly1305Key.x7 = temp.x7;
// second half for the message
ByteIntegerConverter.StoreLittleEndian32(tempBytes, 0, temp.x8);
ByteIntegerConverter.StoreLittleEndian32(tempBytes, 4, temp.x9);
ByteIntegerConverter.StoreLittleEndian32(tempBytes, 8, temp.x10);
ByteIntegerConverter.StoreLittleEndian32(tempBytes, 12, temp.x11);
ByteIntegerConverter.StoreLittleEndian32(tempBytes, 16, temp.x12);
ByteIntegerConverter.StoreLittleEndian32(tempBytes, 20, temp.x13);
ByteIntegerConverter.StoreLittleEndian32(tempBytes, 24, temp.x14);
ByteIntegerConverter.StoreLittleEndian32(tempBytes, 28, temp.x15);
int count = Math.Min(32, messageLength);
for (int i = 0; i \