public static bool VerifyData(
this ECDsaCng ecdsaCng,
byte[] data,
int offset,
int count,
byte[] signature)
{
if (data == null)
{
throw new ArgumentNullException("data");
}
if (offset < 0 || offset > data.Length)
{
throw new ArgumentOutOfRangeException("offset");
}
if (count < 0 || count > data.Length - offset)
{
throw new ArgumentOutOfRangeException("count");
}
if (signature == null)
{
throw new ArgumentNullException("signature");
}
using (BCryptHashAlgorithm hashAlgorithm = new BCryptHashAlgorithm(CngAlgorithm.Sha256, BCryptNative.ProviderName.MicrosoftPrimitiveProvider))
{
hashAlgorithm.HashCore(data, offset, count);
byte[] hashValue = hashAlgorithm.HashFinal();
return(ecdsaCng.VerifyHash(hashValue, signature));
}
}
public static byte[] SignData(
this ECDsaCng ecdsaCng,
byte[] data,
int offset,
int count)
{
Contract.Ensures(Contract.Result <byte[]>() != null);
if (data == null)
{
throw new ArgumentNullException("data");
}
if (offset < 0 || offset > data.Length)
{
throw new ArgumentOutOfRangeException("offset");
}
if (count < 0 || count > data.Length - offset)
{
throw new ArgumentOutOfRangeException("count");
}
using (var hashAlgorithm = new BCryptHashAlgorithm(CngAlgorithm.Sha256, BCryptNative.ProviderName.MicrosoftPrimitiveProvider))
{
hashAlgorithm.HashCore(data, offset, count);
byte[] hashValue = hashAlgorithm.HashFinal();
return(ecdsaCng.SignHash(hashValue));
}
}