/// <summary>
/// 加密
/// </summary>
/// <param name="text">明文</param>
/// <param name="key">key</param>
/// <returns>密文</returns>
public static String encrypt(String text, String key)
{
//16的整数倍
int offset = 0;
byte[] textBytes = Encoding.UTF8.GetBytes(text);
if (textBytes.Length % 16 != 0)
{
offset = 16 - textBytes.Length % 16;
}
int length = textBytes.Length + offset;
//key->byte
byte[] keyBytes = Encoding.UTF8.GetBytes(key);
byte[] MK = new byte[16];
for (int i = 0; i < keyBytes.Length; i++)
{
MK[i] = keyBytes[i];
}
//输入
byte[] PlainText = new byte[length];
for (int i = 0; i < textBytes.Length; i++)
{
PlainText[i] = textBytes[i];
}
//输出
byte[] CipherText = new byte[length];
SM4.SM4_Encrypt(MK, PlainText, CipherText);
return(DataUtil.byteArrayToHexStr(CipherText));
}
public string Decrypt_ECB(string cipherText)
{
SM4_Context ctx = new SM4_Context();
ctx.isPadding = true;
ctx.mode = SM4.SM4_DECRYPT;
byte[] keyBytes;
if (hexString)
{
keyBytes = Hex.Decode(secretKey);
}
else
{
keyBytes = Encoding.ASCII.GetBytes(secretKey);
}
SM4 sm4 = new SM4();
sm4.sm4_setkey_dec(ctx, keyBytes);
byte[] decrypted = sm4.sm4_crypt_ecb(ctx, Hex.Decode(cipherText));
if (decrypted == null)
{
return(string.Empty);
}
else
{
return(Encoding.Default.GetString(decrypted));
}
}
public string Encrypt_CBC(string plainData)
{
SM4_Context ctx = new SM4_Context();
ctx.isPadding = true;
ctx.mode = SM4.SM4_ENCRYPT;
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_enc(ctx, keyBytes);
byte[] encrypted = sm4.sm4_crypt_cbc(ctx, ivBytes, Encoding.Default.GetBytes(plainData));
//return Hex.Encode(encrypted);
//return encrypted;
string cipherText = Encoding.Default.GetString(Hex.Encode(encrypted));
return(cipherText);
}
public string Decrypt_CBC(string cipherData)
{
SM4_Context ctx = new SM4_Context();
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(cipherData));
if (decrypted == null)
{
return(string.Empty);
}
else
{
return(Encoding.Default.GetString(decrypted));
}
//return decrypted;
}
/// <summary>
/// 解密
/// </summary>
/// <param name="text">密文</param>
/// <param name="key">key</param>
/// <returns>明文</returns>
public static String decrypt(String text, String key)
{
//key->byte
byte[] MK = new byte[16];
byte[] keyBytes = Encoding.UTF8.GetBytes(key);
for (int i = 0; i < keyBytes.Length; i++)
{
MK[i] = keyBytes[i];
}
int length = text.Length / 2;
//输入
byte[] CipherText = new byte[length];
byte[] TCipherText = DataUtil.hexStringToByteArray(text);
for (int i = 0; i < TCipherText.Length; i++)
{
CipherText[i] = TCipherText[i];
}
//输出
byte[] PlainText = new byte[length];
SM4.SM4_Decrypt(MK, CipherText, PlainText);
return(DataUtil.byteToString(PlainText));
}
