public bool Verify([ReadOnlyArray] byte[] signature, [ReadOnlyArray] byte[] securedInput, object key)
{
var sharedKey = Ensure.Type <byte[]>(key, "HmacUsingSha expects key to be byte[] array.");
var hmacKey = AlgProvider.CreateKey(sharedKey);
return(WinRTCrypto.CryptographicEngine.VerifySignature(hmacKey, securedInput, signature));
}
public byte[] Sign([ReadOnlyArray] byte[] securedInput, object key)
{
var sharedKey = Ensure.Type <byte[]>(key, "HmacUsingSha expects key to be byte[] array.");
CryptographicKey hmacKey = AlgProvider.CreateKey(CryptographicBuffer.CreateFromByteArray(sharedKey));
return(Buffer.ToBytes(CryptographicEngine.Sign(hmacKey, CryptographicBuffer.CreateFromByteArray(securedInput))));
}
public byte[] Sign(byte[] securedInput, object key)
#endif
{
var sharedKey = Ensure.Type <byte[]>(key, "HmacUsingSha expects key to be byte[] array.");
var hmacKey = AlgProvider.CreateKey(sharedKey);
return(WinRTCrypto.CryptographicEngine.Sign(hmacKey, securedInput));
}
public bool Verify([ReadOnlyArray] byte[] signature, [ReadOnlyArray] byte[] securedInput, object key)
{
var sharedKey = Ensure.Type <byte[]>(key, "HmacUsingSha expects key to be byte[] array.");
IBuffer msg = CryptographicBuffer.CreateFromByteArray(securedInput);
IBuffer hmac = CryptographicBuffer.CreateFromByteArray(signature);
CryptographicKey hmacKey = AlgProvider.CreateKey(CryptographicBuffer.CreateFromByteArray(sharedKey));
return(CryptographicEngine.VerifySignature(hmacKey, msg, hmac));
}
private byte[] ComputeAuthTag(byte[] aad, byte[] iv, byte[] cipherText, byte[] key)
{
byte[] al = Arrays.LongToBytes(aad.Length * 8);
byte[] hmacInput = Arrays.Concat(aad, iv, cipherText, al);
CryptographicKey hmacKey = AlgProvider.CreateKey(CryptographicBuffer.CreateFromByteArray(key));
return(Arrays.FirstHalf(
Buffer.ToBytes(CryptographicEngine.Sign(hmacKey, CryptographicBuffer.CreateFromByteArray(hmacInput)))));
}