C#-用公钥(mod)和Exponent RSA PKCS#1.5转换字符串

Question

我有一个公钥，它是：

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
(非Base64)

和一个指数：

010001
(同样不是base64)

，我需要将其与一个小字符串一起转换为RSA PKCS#1.5但我有点困惑，它总是让我在尝试时出错显然，指数格式错误，公钥不是base64？

这是我的代码

string publicKey = "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";
string exponant = "010001";
string toEncrypt = "Test123";
using (RSACryptoServiceProvider rsa = new RSACryptoServiceProvider())
{
RSAParameters rsap = new RSAParameters {
Modulus = Encoding.UTF8.GetBytes(Convert.ToBase64String(Encoding.UTF8.GetBytes(publicKey))),
Exponent = Encoding.UTF8.GetBytes(Convert.ToBase64String(Encoding.UTF8.GetBytes(exponant)))
};
//Tried with and without the whole base64 thing
rsa.ImportParameters(rsap);
byte[] encryptedData = rsa.Encrypt(Encoding.UTF8.GetBytes(toEncrypt), false);
string base64Encrypted = Convert.ToBase64String(encryptedData);
x = x.Replace(match, text.Contains("(URLENCODE)") ? WebUtility.UrlEncode(base64Encrypted) : base64Encrypted);
}

CryptographicException：错误数据
发生时间：rsa。ImportParameters(rsap)；

我确实有最终结果：

PV7v6F8AOJvIJA6yYJReUf3jRD8HL5LzNIIqs4ehKlwxt00xyvnCCy/MiSX/4ZP6+IZfXPGAs57kM2/KsUau+fgU4p0rxJM569MLZ+RFjBnI/ATE1Ru5v8D2ZcJ89Y0Z3xowVnNMaytwacRf/LZqxIAFpBr/E5G6KSHkSg+3zQiu6RxbHPrWeiYYUWB5XfYDKlPcezW3Qyi9lktGCp2Eq sg+ULX1GD6qIlHySslYlT3kqVZbQb1B5ak416Rq1RMLhUgpsBazuB50jr5I1zfrFdi4UeNlkBWxFcJaGOY8HScKwvlGU7TqGbjucB1rA3mQhGvSTUMFDeGBnGrLwCdA=
(这是在非c#非开源应用程序中使用相同数据得出的)。

Answer 1

您的公钥字符串对我来说就像字节数组的十六进制表示。因此，我测试了使用以下转换将其转换为byte[]：

public static byte[] HexStringToByteArray(string hexString)
{
MemoryStream stream = new MemoryStream(hexString.Length / 2);
for (int i = 0; i < hexString.Length; i += 2)
{
stream.WriteByte(byte.Parse(hexString.Substring(i, 2), System.Globalization.NumberStyles.AllowHexSpecifier));
}
return stream.ToArray();
}

此外，指数可能具有相同的格式(3个字节，0x01 0x00 0x01)，因此我使用相同的方法将其转换为byte[]

最后，代码看起来像：

string publicKey = "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";
string exponant = "010001";
string toEncrypt = "Test123";
using (RSACryptoServiceProvider rsa = new RSACryptoServiceProvider())
{
RSAParameters rsap = new RSAParameters
{
Modulus = HexStringToByteArray(publicKey),
Exponent = HexStringToByteArray(exponant)
};
//Tried with and without the whole base64 thing
rsa.ImportParameters(rsap);
byte[] encryptedData = rsa.Encrypt(Encoding.UTF8.GetBytes(toEncrypt), false);
string base64Encrypted = Convert.ToBase64String(encryptedData);

RSA参数的导入是成功的，加密也是成功的。

输出如下所示。它不一定要和你的一样(你是通过使用非C#、非开源应用程序生成的，我感觉到了某种指责)，因为还有其他因素，比如填充，会影响结果，但加密是成功的。

VXg8wRZz7SDnhg3T1GPs8CztjPsGwES+ngJAaBBVMSNkBiBOU+ju70pI5sAjvFS34+ztY8VLUZZ4vzf9
NkBNCgEn7Q2NezOwgP029yHY169Jc7Kqkwy0UbJLAwCwmqR+/G6B/S2hL2ADV+5EeaEn4ZmmKl/WRp+P
ruwWKDQx46/ih0itvh7uF5/OfKCqeIrcsqpZgQ4pByNQNOTs1sFlKB+/8TZ6Ey00lYU8c3bRLOef0Nh+
uivY0LI2ryOYI//EtmoZqfkeJH2ZqOQPy/I4R/OXHs1RcEZpnam8/OF1c/DlGVp3//RO8owmStxSj/eF
TD5arc3a1kiNma+/DDQYuQ==