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);
//如果剩余字节数不足16个，则不用加密。
if (length >= 16)
{
sm4_one_round(ctx.sk, inBytes, outBytes);
Array.Copy(outBytes, 0, bous, i * 16, 16);
}
else
{
Array.Copy(inBytes, 0, bous, i * 16, length);
}
}
if (ctx.isPadding && ctx.mode == SM4_DECRYPT)
{
bous = padding(bous, SM4_DECRYPT);
}
return(bous);
}
public String Decrypt_CBC(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));
}
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);
}
}
public byte[] decryptECB(String key, Boolean isPadding, byte[] expectedBytes)
{
SM4Context ctx = new SM4Context();
ctx.isPadding = isPadding;
ctx.mode = SM4.SM4_DECRYPT;
secretKey = key;
byte[] keyBytes;
if (hexString)
{
keyBytes = Hex.Decode(secretKey);
}
else
{
keyBytes = Encoding.Default.GetBytes(secretKey);
}
SM4 sm4 = new SM4();
sm4.sm4_setkey_dec(ctx, keyBytes);
byte[] decrypted = sm4.sm4_crypt_ecb(ctx, expectedBytes);
return(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, j * 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, j * 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);
}