/// <summary>
/// 对称加密后的字符串，返回解密后的结果
/// </summary>
/// <param name="input">要解密的内容</param>
/// <param name="key">加密用密钥</param>
/// <param name="iv">加密用的初始化向量</param>
/// <param name="encryptSymmetryType">加密算法</param>
/// <returns>解密后的结果</returns>
public static string DecryptString(this string input, byte[] key, byte[] iv, EncryptSymmetryType encryptSymmetryType)
{
if (input == null || input.Length <= 0)
{
throw new ArgumentNullException("input");
}
if (key == null || key.Length <= 0)
{
throw new ArgumentNullException("key");
}
if (iv == null || iv.Length <= 0)
{
throw new ArgumentNullException("IV");
}
byte[] cipherBytes = Convert.FromBase64String(input);
string plaintext = string.Empty;
SymmetricAlgorithm symmetricAlgorithm = null;
switch (encryptSymmetryType)
{
case EncryptSymmetryType.DES:
case EncryptSymmetryType.Rijandel:
case EncryptSymmetryType.TripleDES:
case EncryptSymmetryType.RC2:
{
symmetricAlgorithm = Encrypt.GetSymmetricAlgorithmBySmartEncryptSymmetryType(encryptSymmetryType);
symmetricAlgorithm.Key = key;
symmetricAlgorithm.IV = iv;
ICryptoTransform decryptor = symmetricAlgorithm.CreateDecryptor(symmetricAlgorithm.Key, symmetricAlgorithm.IV);
using (MemoryStream memoryStream = new MemoryStream(cipherBytes))
{
using (CryptoStream cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read))
{
using (StreamReader streamReader = new StreamReader(cryptoStream))
plaintext = streamReader.ReadToEnd();
}
}
if (symmetricAlgorithm != null)
{
symmetricAlgorithm.Clear();
}
}
break;
}
return(plaintext);
}
/// <summary>
/// 输入要对称加密的原文，返回加密后的结果，输出密钥和初初始化变量
/// </summary>
/// <param name="input">要加密的内容</param>
/// <param name="key">加密的密钥</param>
/// <param name="iv">加密的初始化变量</param>
/// <param name="bitLength">密钥的字节长度</param>
/// <param name="encryptSymmetryType">要采用的对称加密算法</param>
/// <returns>加密后的结果</returns>
private static byte[] EncryptString(this string input, out byte[] key, out byte[] iv, int bitLength, EncryptSymmetryType encryptSymmetryType)
{
if (input == null || input.Length <= 0)
{
throw new ArgumentNullException("input");
}
SymmetricAlgorithm symmetricAlgorithm = null;
byte[] plainBytes = null;
key = null;
iv = null;
MemoryStream memoryStream = new MemoryStream();
switch (encryptSymmetryType)
{
case EncryptSymmetryType.DES:
case EncryptSymmetryType.Rijandel:
case EncryptSymmetryType.TripleDES:
case EncryptSymmetryType.RC2:
{
symmetricAlgorithm = Encrypt.GetSymmetricAlgorithmBySmartEncryptSymmetryType(encryptSymmetryType);
if (bitLength != int.MinValue && !symmetricAlgorithm.ValidKeySize(bitLength))
{
throw new Exception("密钥大小对当前算法无效");
}
if (bitLength != int.MinValue && symmetricAlgorithm.ValidKeySize(bitLength))
{
symmetricAlgorithm.KeySize = bitLength;
}
symmetricAlgorithm.GenerateKey();
symmetricAlgorithm.GenerateIV();
key = symmetricAlgorithm.Key;
iv = symmetricAlgorithm.IV;
ICryptoTransform decryptor = symmetricAlgorithm.CreateEncryptor(symmetricAlgorithm.Key, symmetricAlgorithm.IV);
using (CryptoStream cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Write))
{
using (StreamWriter streamWriter = new StreamWriter(cryptoStream))
{
streamWriter.Write(input);
}
}
if (symmetricAlgorithm != null)
{
symmetricAlgorithm.Clear();
}
}
break;
}
plainBytes = memoryStream.ToArray();
return(plainBytes);
}
/// <summary>
/// 输入要对称加密的原文，返回加密后的结果，输出密钥和初初始化变量
/// </summary>
/// <param name="input">要加密的内容</param>
/// <param name="key">加密的密钥</param>
/// <param name="iv">加密的初始化变量</param>
/// <param name="bitLength">密钥的字节长度</param>
/// <param name="encryptSymmetryType">要采用的对称加密算法</param>
/// <returns>加密后的结果</returns>
private static string EncryptString(this string input, out string key, out string iv, int bitLength, EncryptSymmetryType encryptSymmetryType)
{
byte[] resultBuffer;
byte[] keyBytes;
byte[] ivandBytes;
resultBuffer = EncryptString(input, out keyBytes, out ivandBytes, bitLength, encryptSymmetryType);
key = Convert.ToBase64String(keyBytes);
iv = Convert.ToBase64String(ivandBytes);
return(Convert.ToBase64String(resultBuffer));
}
/// <summary>
/// 输入要对称加密的原文，返回加密后的结果，输出密钥和初初始化变量
/// </summary>
/// <param name="input">要加密的内容</param>
/// <param name="key">加密的密钥</param>
/// <param name="iv">加密的初始化变量</param>
/// <param name="encryptSymmetryType">要采用的对称加密算法</param>
/// <returns>加密后的结果</returns>
public static byte[] EncryptString(this string input, out byte[] key, out byte[] iv, EncryptSymmetryType encryptSymmetryType)
{
byte[] resultBuffer;
byte[] keyBytes;
byte[] ivandBytes;
resultBuffer = EncryptString(input, out keyBytes, out ivandBytes, int.MinValue, encryptSymmetryType);
key = keyBytes;
iv = ivandBytes;
return(resultBuffer);
}
/// <summary>
/// 输入要对称加密的原文，返回加密后的结果，输出密钥和初初始化变量
/// 密钥字节长度采用默认值
/// </summary>
/// <param name="input">要加密的内容</param>
/// <param name="key">加密的密钥</param>
/// <param name="iv">加密的初始化变量</param>
/// <param name="encryptSymmetryType">要采用的对称加密算法</param>
/// <returns>加密后的结果</returns>
public static string EncryptString(this string input, out string key, out string iv, EncryptSymmetryType encryptSymmetryType)
{
string result;
string keY;
string iV;
result = EncryptString(input, out keY, out iV, int.MinValue, encryptSymmetryType);
key = keY;
iv = iV;
return(result);
}
/// <summary>
/// 用输入的密钥和初始化向量，对输入的文本进行加密，返回加密后的结果
/// 密钥与初始话向量不可为汉语
/// 密钥字节长度采用默认值
/// </summary>
/// <param name="input">要加密的内容</param>
/// <param name="key">加密用的密钥</param>
/// <param name="iv">加密用的初始化变量</param>
/// <param name="encryptSymmetryType">要采用的对称加密算法</param>
/// <returns>加密后的结果</returns>
private static byte[] EncryptStringByKeyIV(this string input, byte[] key, byte[] iv, EncryptSymmetryType encryptSymmetryType)
{
return(EncryptStringByKeyIV(input, key, iv, int.MinValue, encryptSymmetryType));
}
/// <summary>
/// 用输入的密钥和初始化向量，对输入的文本进行加密，返回加密后的结果
/// 密钥与初始话向量不可为汉语
/// </summary>
/// <param name="input">要加密的内容</param>
/// <param name="key">加密用的密钥</param>
/// <param name="iv">加密用的初始化变量</param>
/// <param name="bitLength">密钥的字节长度</param>
/// <param name="encryptSymmetryType">要采用的对称加密算法</param>
/// <returns>加密后的结果</returns>
private static string EncryptStringByKeyIV(this string input, string key, string iv, int bitLength, EncryptSymmetryType encryptSymmetryType)
{
if (input == null || input.Length <= 0)
{
throw new ArgumentNullException("input");
}
if (key == null || key.Length <= 0)
{
throw new ArgumentNullException("key");
}
if (iv == null || iv.Length <= 0)
{
throw new ArgumentNullException("iv");
}
byte[] resultBuffer;
byte[] keyBytes = Encoding.Default.GetBytes(key);
byte[] ivandBytes = Encoding.Default.GetBytes(iv);
resultBuffer = EncryptStringByKeyIV(input, keyBytes, ivandBytes, (bitLength == int.MinValue ? keyBytes.Length : bitLength), encryptSymmetryType);
return(Convert.ToBase64String(resultBuffer));
}
/// <summary>
/// 用输入的密钥和初始化向量，对输入的文本进行加密，返回加密后的结果
/// 密钥与初始话向量不可为汉语
/// 密钥字节长度采用默认值
/// </summary>
/// <param name="input">要加密的内容</param>
/// <param name="key">加密用的密钥</param>
/// <param name="iv">加密用的初始化变量</param>
/// <param name="encryptSymmetryType">要采用的对称加密算法</param>
/// <returns>加密后的结果</returns>
private static string EncryptStringByKeyIV(this string input, string key, string iv, EncryptSymmetryType encryptSymmetryType)
{
return(EncryptStringByKeyIV(input, key, iv, int.MinValue, encryptSymmetryType));
}
/// <summary>
/// 对称加密输入结果，返回解密后的结果
/// </summary>
/// <param name="input">要解密的内容</param>
/// <param name="key">加密用密钥</param>
/// <param name="iv">加密用的初始化向量</param>
/// <param name="encryptSymmetryType">加密算法</param>
/// <returns>解密后的结果</returns>
public static string DecryptString(this string input, string key, string iv, EncryptSymmetryType encryptSymmetryType)
{
byte[] keY = Convert.FromBase64String(key);
byte[] iV = Convert.FromBase64String(iv);
return(DecryptString(input, keY, iV, encryptSymmetryType));
}