/// <summary>
/// 生成随机密钥
/// </summary>
/// <returns></returns>
public static byte[] CreateKeyBytes(enmSymmetricAlgorithmType enmType)
{
SymmetricAlgorithm desCrypto = null;
switch (enmType)
{
case enmSymmetricAlgorithmType.DES:
desCrypto = (DESCryptoServiceProvider)DESCryptoServiceProvider.Create();
return(desCrypto.Key);
case enmSymmetricAlgorithmType.RIJNDAEL:
desCrypto = Rijndael.Create();
desCrypto.KeySize = 256;
return(desCrypto.Key);
}
return(null);
}
/// <summary>
/// 生成加密服务对象
/// </summary>
/// <param name="isNew">是否生成具备新密钥的加密服务对象；true 为是；false 为否，为否时将按照默认密钥生成对象。</param>
/// <returns></returns>
public SymmetricAlgorithm Create(enmSymmetricAlgorithmType enmType, bool blnIsNew)
{
SymmetricAlgorithm desProvide = null;
byte[] byteKey = null;
switch (enmType)
{
case enmSymmetricAlgorithmType.DES:
desProvide = new DESCryptoServiceProvider();
if (blnIsNew)
{
byteKey = clsSymmetricAlgorithm.CreateKeyBytes(enmType);
}
else
{
byteKey = new byte[8];
Array.ConstrainedCopy(this.KEY, 0, byteKey, 0, 8);
}
desProvide.IV = byteKey;
desProvide.Key = byteKey;
break;
case enmSymmetricAlgorithmType.RIJNDAEL:
desProvide = Rijndael.Create();
if (blnIsNew)
{
byte[] byteNewKey = clsSymmetricAlgorithm.CreateKeyBytes(enmType);
byteKey = new byte[16];
Array.ConstrainedCopy(byteNewKey, 0, byteKey, 0, 16);
}
else
{
byteKey = new byte[16];
Array.ConstrainedCopy(this.KEY, 0, byteKey, 0, 16);
}
desProvide.IV = byteKey;
desProvide.Key = this.KEY;
break;
}
return(desProvide);
}
/// <summary>
/// 跟默认密钥加密
/// </summary>
/// <param name="strText">明文</param>
/// <returns></returns>
public string Encrypt(string strText, enmSymmetricAlgorithmType enmType)
{
return(this.Encrypt(strText, this.Create(enmType, false)));
}
/// <summary>
/// 生成随机密钥
/// </summary>
/// <returns></returns>
public static string CreateKeyString(enmSymmetricAlgorithmType enmType)
{
return(Convert.ToBase64String(clsSymmetricAlgorithm.CreateKeyBytes(enmType)));
}