/// <summary>
/// SM4 Crypt ECB
/// </summary>
/// <param name="ctx"></param>
/// <param name="input"></param>
/// <returns></returns>
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);
}
/// <summary>
/// SM4 SetKey DEC
/// </summary>
/// <param name="ctx"></param>
/// <param name="key"></param>
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);
}
}
protected override ICryptoValue DecryptInternal(ArraySegment <byte> cipherBytes, CancellationToken cancellationToken)
{
var cipher = GetBytes(cipherBytes);
var ctx = new SM4Context {
IsPadding = true, Mode = SM4Core.SM4_DECRYPT
};
var sm4 = new SM4Core();
sm4.sm4_setkey_dec(ctx, Key.GetKey());
var original = sm4.sm4_crypt_cbc(ctx, Key.GetIV(), cipher);
return(CreateCryptoValue(original, cipher, CryptoMode.Decrypt));
}
protected override ICryptoValue EncryptInternal(ArraySegment <byte> originalBytes, CancellationToken cancellationToken)
{
var original = GetBytes(originalBytes);
var ctx = new SM4Context {
IsPadding = true, Mode = SM4Core.SM4_ENCRYPT
};
var sm4 = new SM4Core();
sm4.sm4_setkey_enc(ctx, Key.GetKey());
var cipher = sm4.sm4_crypt_cbc(ctx, Key.GetIV(), original); //CBC MODE
return(CreateCryptoValue(original, cipher, CryptoMode.Encrypt));
}
/// <summary>
/// SM4 Crypt CBC
/// </summary>
/// <param name="ctx"></param>
/// <param name="iv"></param>
/// <param name="input"></param>
/// <returns></returns>
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());
}
}
/// <summary>
/// SM4 SetKey ENC
/// </summary>
/// <param name="ctx"></param>
/// <param name="key"></param>
public void sm4_setkey_enc(SM4Context ctx, byte[] key)
{
ctx.Mode = SM4_ENCRYPT;
sm4_setkey(ctx.SK, key);
}
