private static extern int CryptoNative_RsaDecrypt(
SafeEvpPKeyHandle pkey,
ref byte source,
int sourceLength,
RSAEncryptionPaddingMode paddingMode,
IntPtr digestAlgorithm,
ref byte destination,
int destinationLength);
public static byte[] DecryptRSA(this byte[] data, RSAParameters privateKey,
RSAEncryptionPaddingMode padding = RSAEncryptionPaddingMode.OaepSHA256)
{
using var rsa = RSA.Create();
rsa.ImportParameters(privateKey);
var result = padding switch
{
RSAEncryptionPaddingMode.Pkcs1 => rsa.Decrypt(data,
RSAEncryptionPadding.Pkcs1),
RSAEncryptionPaddingMode.OaepSHA1 => rsa.Decrypt(data,
RSAEncryptionPadding.OaepSHA1),
RSAEncryptionPaddingMode.OaepSHA256 => rsa.Decrypt(data,
RSAEncryptionPadding.OaepSHA256),
RSAEncryptionPaddingMode.OaepSHA384 => rsa.Decrypt(data,
RSAEncryptionPadding.OaepSHA384),
RSAEncryptionPaddingMode.OaepSHA512 => rsa.Decrypt(data,
RSAEncryptionPadding.OaepSHA512),
_ => throw new ArgumentOutOfRangeException(nameof(padding), padding, null)
};
return(result);
}
internal static int RsaDecrypt(
SafeEvpPKeyHandle pkey,
ReadOnlySpan <byte> source,
RSAEncryptionPaddingMode paddingMode,
IntPtr digestAlgorithm,
Span <byte> destination)
{
int written = CryptoNative_RsaDecrypt(
pkey,
ref MemoryMarshal.GetReference(source),
source.Length,
paddingMode,
digestAlgorithm,
ref MemoryMarshal.GetReference(destination),
destination.Length);
if (written < 0)
{
Debug.Assert(written == -1);
throw CreateOpenSslCryptographicException();
}
return(written);
}
private RSAEncryptionPadding(RSAEncryptionPaddingMode mode, HashAlgorithmName oaepHashAlgorithm)
{
_mode = mode;
_oaepHashAlgorithm = oaepHashAlgorithm;
}
public static string DecryptRSAToString(this byte[] data, RSAParameters privateKey,
RSAEncryptionPaddingMode padding = RSAEncryptionPaddingMode.OaepSHA256)
{
return(DecryptRSA(data, privateKey, padding).ToText());
}
public static byte[] EncryptRSA(this string data, RSAParameters publicKey,
RSAEncryptionPaddingMode padding = RSAEncryptionPaddingMode.OaepSHA256)
{
return(EncryptRSA(data.ToByteArray(), publicKey, padding));
}