public static byte[] Encrypt_ECB(byte[] plainBytes, byte[] keyBytes)
{
SM4_Context ctx = new SM4_Context();
SM4Base sm4 = new SM4Base();
sm4.sm4_setkey_enc(ctx, keyBytes);
byte[] encrypted = sm4.sm4_crypt_ecb(ctx, plainBytes);
return(encrypted);
}
public static byte[] Decrypt_CBC(byte[] plainBytes, byte[] keyBytes, byte[] ivBytes)
{
SM4_Context ctx = new SM4_Context();
SM4Base sm4 = new SM4Base();
sm4.sm4_setkey_dec(ctx, keyBytes);
byte[] encrypted = sm4.sm4_crypt_cbc(ctx, ivBytes, plainBytes);
return(encrypted);
}
public void sm4_setkey_dec(SM4_Context 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[] sm4_crypt_ecb(SM4_Context ctx, byte[] input)
{
int length = input.Length;
byte[] bins = new byte[length];
Array.Copy(input, 0, bins, 0, length);
byte[] bous = new byte[length];
byte[] inBytes = new byte[16];
byte[] outBytes = new byte[16];
for (int i = 0; length > 0; length -= 16, i++)
{
Array.Copy(bins, i * 16, inBytes, 0, 16);
sm4_one_round(ctx.sk, inBytes, outBytes);
Array.Copy(outBytes, 0, bous, i * 16, 16);
}
return(bous);
}
public byte[] sm4_crypt_cbc(SM4_Context ctx, byte[] iv, byte[] input)
{
int i = 0;
int length = input.Length;
byte[] bins = new byte[length];
Array.Copy(input, 0, bins, 0, length);
byte[] bous = new byte[length];
byte[] inBytes = new byte[16];
byte[] xorBytes = new byte[16];
byte[] resBytes = new byte[16];
if (ctx.mode == SM4_ENCRYPT)
{
for (int j = 0; length > 0; length -= 16, j++)
{
Array.Copy(bins, j * 16, inBytes, 0, 16);
for (i = 0; i < 16; i++)
{
xorBytes[i] = ((byte)(inBytes[i] ^ iv[i]));
}
sm4_one_round(ctx.sk, xorBytes, resBytes);
Array.Copy(resBytes, 0, iv, 0, 16);
Array.Copy(resBytes, 0, bous, j * 16, 16);
}
}
else
{
byte[] temp = new byte[16];
for (int j = 0; length > 0; length -= 16, j++)
{
Array.Copy(bins, j * 16, inBytes, 0, 16);
sm4_one_round(ctx.sk, inBytes, resBytes);
for (i = 0; i < 16; i++)
{
xorBytes[i] = ((byte)(resBytes[i] ^ iv[i]));
}
Array.Copy(inBytes, 0, iv, 0, 16);
Array.Copy(xorBytes, 0, bous, j * 16, 16);
}
}
return(bous);
}
public void sm4_setkey_enc(SM4_Context ctx, byte[] key)
{
ctx.mode = SM4_ENCRYPT;
sm4_setkey(ctx.sk, key);
}
