/// <summary>
/// RSA解密
/// </summary>
/// <param name="encryptData">密文</param>
/// <param name="privateKey">RSA私钥</param>
/// <param name="isBase64">密文数据是否用Base64编码</param>
/// <returns></returns>
public static string RSADecrypt(string encryptData, string privateKey = DefaultRSAPublicKey, bool isBase64 = false)
{
byte[] bData;
if (isBase64)
{
bData = Convert.FromBase64String(encryptData);
}
else
{
bData = ByteStrConvertHelper.ToBytes(encryptData);
}
var rsa = new RSACryptoServiceProvider();
rsa.FromXmlString(privateKey);
var cipherbytes = rsa.Decrypt(bData, false);
return(Encoding.UTF8.GetString(cipherbytes));
}
/// <summary>
/// RC2解密
/// </summary>
/// <param name="encryptStr">明文字符串</param>
/// <param name="key">加密密钥支持40~128长度，可以每8位递增（5到16个长度的字符串）</param>
/// <param name="iv">加密向量64位以上（8个字节上去字符串）</param>
/// <param name="isBase64Code">是否是Base64编码，否则是16进制编码</param>
/// <param name="mode">加密模式</param>
/// <param name="padding">填充模式</param>
/// <returns>明文</returns>
public static string RC2Decrypt(string encryptStr, string key = DefaultRC2Key, string iv = DefaultRC2IV, bool isBase64Code = true, CipherMode mode = CipherMode.CBC, PaddingMode padding = PaddingMode.PKCS7)
{
byte[] bKey = Encoding.UTF8.GetBytes(key);
byte[] bIV = Encoding.UTF8.GetBytes(iv);
byte[] byteArray;
if (isBase64Code)
{
byteArray = Convert.FromBase64String(encryptStr);
}
else
{
byteArray = ByteStrConvertHelper.ToBytes(encryptStr);
}
string decrypt = null;
var rc2 = new RC2CryptoServiceProvider();
try
{
rc2.Mode = mode;
rc2.Padding = padding;
using (var mStream = new MemoryStream())
{
using (var cStream = new CryptoStream(mStream, rc2.CreateDecryptor(bKey, bIV), CryptoStreamMode.Write))
{
cStream.Write(byteArray, 0, byteArray.Length);
cStream.FlushFinalBlock();
decrypt = Encoding.UTF8.GetString(mStream.ToArray());
}
}
}
catch { }
rc2.Clear();
return(decrypt);
}
/// <summary>
/// AES解密
/// </summary>
/// <param name="encryptStr">密文字符串</param>
/// <param name="key">加密密钥支持128(16字节)、192(24字节)、256位(32字节)的key</param>
/// <param name="iv">加密向量(16到19字节)</param>
/// <param name="isBase64Code">是否是Base64编码，否则是16进制编码</param>
/// <param name="mode">加密模式</param>
/// <param name="padding">填充模式</param>
/// <returns>明文字节数组</returns>
public static byte[] AESDecryptToBytes(string encryptStr, string key = DefaultAESKey, string iv = DefaultAESIV, bool isBase64Code = true, CipherMode mode = CipherMode.CBC, PaddingMode padding = PaddingMode.PKCS7)
{
byte[] bKey = Encoding.UTF8.GetBytes(key);
byte[] bIV = Encoding.UTF8.GetBytes(iv);
byte[] byteArray;
if (isBase64Code)
{
byteArray = Convert.FromBase64String(encryptStr);
}
else
{
byteArray = ByteStrConvertHelper.ToBytes(encryptStr);
}
byte[] decrypt = null;
var aes = Rijndael.Create();
try
{
aes.Mode = mode;
aes.Padding = padding;
using (var mStream = new MemoryStream())
{
using (var cStream = new CryptoStream(mStream, aes.CreateDecryptor(bKey, bIV), CryptoStreamMode.Write))
{
cStream.Write(byteArray, 0, byteArray.Length);
cStream.FlushFinalBlock();
}
decrypt = mStream.ToArray();
}
}
catch { }
aes.Clear();
return(decrypt);
}