public static string DecryptRSA(string privateKeyAsPem, byte[] payload, string passphrase = null)
{
var encoder = new UTF8Encoding();
byte[] byte_payload = payload;
CryptoKey d = CryptoKey.FromPrivateKey(privateKeyAsPem, passphrase);
OpenSSL.Crypto.RSA rsa = d.GetRSA();
byte[] result = rsa.PrivateDecrypt(byte_payload, OpenSSL.Crypto.RSA.Padding.PKCS1);
rsa.Dispose();
return(encoder.GetString(result));
}
/// <summary>
/// 私钥解密
/// </summary>
public static string PrivateDecrypt(string privateKey, string text, Encoding encoding, int padding)
{
byte[] textBytes = Convert.FromBase64String(text);
using (BIO bio = new BIO(privateKey))
{
using (OpenSSL.Crypto.RSA rsa = OpenSSL.Crypto.RSA.FromPrivateKey(bio))
{
textBytes = rsa.PrivateDecrypt(textBytes, (OpenSSL.Crypto.RSA.Padding)padding);
}
}
return(encoding.GetString(textBytes));
}
private void TestKey(int v, RSA key)
{
byte[] ctext_ex = null;
switch (v % 3)
{
case 0: ctext_ex = Key1(key); break;
case 1: ctext_ex = Key2(key); break;
case 2: ctext_ex = Key3(key); break;
}
if (v / 3 >= 1)
key.ConstantTime = false;
byte[] ctext = key.PublicEncrypt(ptext_ex, RSA.Padding.PKCS1);
Assert.AreEqual(ctext_ex.Length, ctext.Length);
byte[] ptext = key.PrivateDecrypt(ctext, RSA.Padding.PKCS1);
string str1 = BitConverter.ToString(ptext);
string str2 = BitConverter.ToString(ptext_ex);
Assert.AreEqual(str2, str1);
Console.WriteLine("PKCS #1 v1.5 encryption/decryption ok");
ctext = key.PublicEncrypt(ptext_ex, RSA.Padding.OAEP);
Assert.AreEqual(ctext_ex.Length, ctext.Length);
ptext = key.PrivateDecrypt(ctext, RSA.Padding.OAEP);
str1 = BitConverter.ToString(ptext);
str2 = BitConverter.ToString(ptext_ex);
Assert.AreEqual(str2, str1);
Console.WriteLine("OAEP test vector {0} passed!", v);
// Different ciphertexts (rsa_oaep.c without -DPKCS_TESTVECT).
// Try decrypting ctext_ex
ptext = key.PrivateDecrypt(ctext_ex, RSA.Padding.OAEP);
str1 = BitConverter.ToString(ptext);
str2 = BitConverter.ToString(ptext_ex);
Assert.AreEqual(str2, str1);
Console.WriteLine("OAEP encryption/decryption ok!", v);
for (int n = 0; n < ctext.Length; ++n)
{
byte saved = ctext[n];
for (byte b = 0; b < byte.MaxValue; ++b)
{
if (b == saved)
continue;
ctext[n] = b;
bool error = false;
try
{
ptext = key.PrivateDecrypt(ctext, RSA.Padding.OAEP);
}
catch (Exception)
{
error = true;
}
Assert.IsTrue(error, "Corrupt data decrypted!");
}
}
}
