/// <summary>
/// 加密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="plainText">明文</param>
/// <returns>返回密文</returns>
public String Encrypt_CBC(String secretKey, bool hexString, string iv, String plainText)
{
Sm4Context ctx = new Sm4Context();
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(plainText));
String cipherText = Encoding.Default.GetString(Hex.Encode(encrypted));
return(cipherText);
}
public byte[] sm4_crypt_ecb(Sm4Context ctx, byte[] input)
{
if ((ctx.isPadding) && (ctx.mode == SM4_ENCRYPT))
{
input = padding(input, SM4_ENCRYPT);
}
int length = input.Length;
byte[] bins = new byte[length];
Array.Copy(input, 0, bins, 0, length);
byte[] bous = new byte[length];
for (int i = 0; length > 0; length -= 16, i++)
{
byte[] inBytes = new byte[16];
byte[] outBytes = new byte[16];
Array.Copy(bins, i * 16, inBytes, 0, length > 16 ? 16 : length);
sm4_one_round(ctx.sk, inBytes, outBytes);
Array.Copy(outBytes, 0, bous, i * 16, length > 16 ? 16 : length);
}
if (ctx.isPadding && ctx.mode == SM4_DECRYPT)
{
bous = padding(bous, SM4_DECRYPT);
}
return(bous);
}
public void sm4_setkey_dec(Sm4Context ctx, byte[] key)
{
int i = 0;
ctx.mode = SM4_DECRYPT;
sm4_setkey(ctx.sk, key);
for (i = 0; i < 16; i++)
{
SWAP(ctx.sk, i);
}
}
/// <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));
}
public byte[] sm4_crypt_cbc(Sm4Context ctx, byte[] iv, byte[] input)
{
if (ctx.isPadding && ctx.mode == SM4_ENCRYPT)
{
input = padding(input, SM4_ENCRYPT);
}
int i = 0;
int length = input.Length;
byte[] bins = new byte[length];
Array.Copy(input, 0, bins, 0, length);
byte[] bous = null;
List <byte> bousList = new List <byte>();
if (ctx.mode == SM4_ENCRYPT)
{
for (int j = 0; length > 0; length -= 16, j++)
{
byte[] inBytes = new byte[16];
byte[] outBytes = new byte[16];
byte[] out1 = new byte[16];
Array.Copy(bins, i * 16, inBytes, 0, length > 16 ? 16 : length);
for (i = 0; i < 16; i++)
{
outBytes[i] = ((byte)(inBytes[i] ^ iv[i]));
}
sm4_one_round(ctx.sk, outBytes, out1);
Array.Copy(out1, 0, iv, 0, 16);
for (int k = 0; k < 16; k++)
{
bousList.Add(out1[k]);
}
}
}
else
{
byte[] temp = new byte[16];
for (int j = 0; length > 0; length -= 16, j++)
{
byte[] inBytes = new byte[16];
byte[] outBytes = new byte[16];
byte[] out1 = new byte[16];
Array.Copy(bins, i * 16, inBytes, 0, length > 16 ? 16 : length);
Array.Copy(inBytes, 0, temp, 0, 16);
sm4_one_round(ctx.sk, inBytes, outBytes);
for (i = 0; i < 16; i++)
{
out1[i] = ((byte)(outBytes[i] ^ iv[i]));
}
Array.Copy(temp, 0, iv, 0, 16);
for (int k = 0; k < 16; k++)
{
bousList.Add(out1[k]);
}
}
}
if (ctx.isPadding && ctx.mode == SM4_DECRYPT)
{
bous = padding(bousList.ToArray(), SM4_DECRYPT);
return(bous);
}
else
{
return(bousList.ToArray());
}
}
public void sm4_setkey_enc(Sm4Context ctx, byte[] key)
{
ctx.mode = SM4_ENCRYPT;
sm4_setkey(ctx.sk, key);
}
