private string EncryptCBC(string plainText)
{
if (_iv == null)
{
throw new NotSupportedException("对象初始化的时候没有设置iv向量,所以不能使用CBC模式进行加解密");
}
var ctx = new SM4Context();
ctx.isPadding = true;
ctx.mode = SM4_ENCRYPT;
sm4_setkey_enc(ctx, _secretKey);
var encrypted = sm4_crypt_cbc(ctx, _iv, _encoding.GetBytes(plainText));
switch (_encryptionResultType)
{
case EncryptionResultTypes.Base64String:
return(Convert.ToBase64String(encrypted));
case EncryptionResultTypes.HexString:
return(_encoding.GetString(Hex.Encode(encrypted)));
default:
throw new NotSupportedException("不支持的输出类型" + _encryptionResultType.ToString());
}
}
private static 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);
}
private string DecryptCBC(string cipherText)
{
if (_iv == null)
{
throw new NotSupportedException("对象初始化的时候没有设置iv向量,所以不能使用CBC模式进行加解密");
}
var ctx = new SM4Context();
ctx.isPadding = true;
ctx.mode = SM4_DECRYPT;
sm4_setkey_dec(ctx, _secretKey);
byte[] decrypted;
switch (_encryptionResultType)
{
case EncryptionResultTypes.Base64String:
decrypted = sm4_crypt_cbc(ctx, _iv, Convert.FromBase64String(cipherText));
break;
case EncryptionResultTypes.HexString:
decrypted = sm4_crypt_cbc(ctx, _iv, Hex.Decode(cipherText));
break;
default:
throw new NotSupportedException("不支持的密文类型" + _encryptionResultType.ToString());
}
return(_encoding.GetString(decrypted));
}
private string DecryptECB(string cipherText)
{
var ctx = new SM4Context();
ctx.isPadding = true;
ctx.mode = SM4_DECRYPT;
sm4_setkey_dec(ctx, _secretKey);
byte[] decrypted;
switch (_encryptionResultType)
{
case EncryptionResultTypes.Base64String:
decrypted = sm4_crypt_ecb(ctx, Convert.FromBase64String(cipherText));
break;
case EncryptionResultTypes.HexString:
decrypted = sm4_crypt_ecb(ctx, Hex.Decode(cipherText));
break;
default:
throw new NotSupportedException("不支持的密文类型" + _encryptionResultType.ToString());
}
return(_encoding.GetString(decrypted));
}
private static 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);
}
}
private string EncryptECB(string plainText)
{
var ctx = new SM4Context();
ctx.isPadding = true;
ctx.mode = SM4_ENCRYPT;
sm4_setkey_enc(ctx, _secretKey);
var encrypted = sm4_crypt_ecb(ctx, _encoding.GetBytes(plainText));
//Console.WriteLine(Convert.ToBase64String(encrypted));
switch (_encryptionResultType)
{
case EncryptionResultTypes.Base64String:
return(Convert.ToBase64String(encrypted));
case EncryptionResultTypes.HexString:
return(_encoding.GetString(Hex.Encode(encrypted)));
default:
throw new NotSupportedException("不支持的输出类型" + _encryptionResultType.ToString());
}
}
private static 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());
}
}
private static void sm4_setkey_enc(SM4Context ctx, byte[] key)
{
ctx.mode = SM4_ENCRYPT;
sm4_setkey(ctx.sk, key);
}