C# RSA 加密，解密与签名，验证签名

#region 加签
/// <summary>
/// 基于BouncyCastle的RSA签名
/// </summary>
/// <param name="data"></param>
/// <param name="privateKeyJava"></param>
/// <param name="hashAlgorithm">JAVA的和.NET的不一样，如：MD5(.NET)等同于MD5withRSA(JAVA)</param>
/// <param name="encoding"></param>
/// <returns></returns>
public static string RSASignJavaBouncyCastle(string data, string privateKeyJava, string hashAlgorithm = "MD5withRSA", string encoding = "UTF-8")
{
    RsaKeyParameters privateKeyParam = (RsaKeyParameters)PrivateKeyFactory.CreateKey(Convert.FromBase64String(privateKeyJava));
    ISigner signer = SignerUtilities.GetSigner(hashAlgorithm);
    signer.Init(true, privateKeyParam);//参数为true验签，参数为false加签
    var dataByte = Encoding.GetEncoding(encoding).GetBytes(data);
    signer.BlockUpdate(dataByte, 0, dataByte.Length);
    //return Encoding.GetEncoding(encoding).GetString(signer.GenerateSignature()); //签名结果 非Base64String
    return Convert.ToBase64String(signer.GenerateSignature());
}
#endregion

#region 验签
/// <summary>
/// 基于BouncyCastle的RSA签名
/// </summary>
/// <param name="data">源数据</param>
/// <param name="publicKeyJava"></param>
/// <param name="signature">base64签名</param>
/// <param name="hashAlgorithm">JAVA的和.NET的不一样，如：MD5(.NET)等同于MD5withRSA(JAVA)</param>
/// <param name="encoding"></param>
/// <returns></returns>
public static bool VerifyJavaBouncyCastle(string data, string publicKeyJava, string signature, string hashAlgorithm = "MD5withRSA", string encoding = "UTF-8")
{
    RsaKeyParameters publicKeyParam = (RsaKeyParameters)PublicKeyFactory.CreateKey(Convert.FromBase64String(publicKeyJava));
    ISigner signer = SignerUtilities.GetSigner(hashAlgorithm);
    signer.Init(false, publicKeyParam);
    byte[] dataByte = Encoding.GetEncoding(encoding).GetBytes(data);
    signer.BlockUpdate(dataByte, 0, dataByte.Length);
    //byte[] signatureByte = Encoding.GetEncoding(encoding).GetBytes(signature);// 非Base64String
    byte[] signatureByte = Convert.FromBase64String(signature);
    return signer.VerifySignature(signatureByte);
}