/// <summary>
/// 解密ECB模式
/// </summary>
/// <param name="secretKey">密钥</param>
/// <param name="hexString">明文是否是十六进制</param>
/// <param name="cipherText">密文</param>
/// <returns>返回明文</returns>
public String Decrypt_ECB(String secretKey, bool hexString, String cipherText)
{
Sm4Context ctx = new Sm4Context();
ctx.isPadding = true;
ctx.mode = Sm4.SM4_DECRYPT;
byte[] keyBytes;
if (hexString)
{
keyBytes = Hex.Decode(secretKey);
}
else
{
keyBytes = Encoding.UTF8.GetBytes(secretKey);
}
Sm4 sm4 = new Sm4();
sm4.sm4_setkey_dec(ctx, keyBytes);
byte[] decrypted = sm4.sm4_crypt_ecb(ctx, Hex.Decode(cipherText));
return(Encoding.UTF8.GetString(decrypted));
}
/// <summary>
/// 解密CBC模式
/// </summary>
/// <param name="secretKey">密钥</param>
/// <param name="hexString">明文是否是十六进制</param>
/// <param name="iv"></param>
/// <param name="cipherText">密文</param>
/// <returns>返回明文</returns>
public String Decrypt_CBC(String secretKey, bool hexString, string iv, String cipherText)
{
Sm4Context ctx = new Sm4Context();
ctx.isPadding = true;
ctx.mode = Sm4.SM4_DECRYPT;
byte[] keyBytes;
byte[] ivBytes;
if (hexString)
{
keyBytes = Hex.Decode(secretKey);
ivBytes = Hex.Decode(iv);
}
else
{
keyBytes = Encoding.Default.GetBytes(secretKey);
ivBytes = Encoding.Default.GetBytes(iv);
}
Sm4 sm4 = new Sm4();
sm4.sm4_setkey_dec(ctx, keyBytes);
byte[] decrypted = sm4.sm4_crypt_cbc(ctx, ivBytes, Hex.Decode(cipherText));
return(Encoding.Default.GetString(decrypted));
}