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130 lines
3.2 KiB
130 lines
3.2 KiB
using Org.BouncyCastle.Crypto;
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using Org.BouncyCastle.Crypto.Parameters;
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using Org.BouncyCastle.Math;
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using Org.BouncyCastle.Math.EC;
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namespace Admin.NET.Core;
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public class Cipher
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{
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private int ct;
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private ECPoint p2;
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private SM3Digest sm3keybase;
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private SM3Digest sm3c3;
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private readonly byte[] key;
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private byte keyOff;
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public Cipher()
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{
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ct = 1;
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key = new byte[32];
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keyOff = 0;
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}
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public static byte[] ByteConvert32Bytes(BigInteger n)
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{
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if (n == null)
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return null;
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byte[] tmpd;
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if (n.ToByteArray().Length == 33)
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{
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tmpd = new byte[32];
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Array.Copy(n.ToByteArray(), 1, tmpd, 0, 32);
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}
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else if (n.ToByteArray().Length == 32)
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{
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tmpd = n.ToByteArray();
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}
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else
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{
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tmpd = new byte[32];
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for (int i = 0; i < 32 - n.ToByteArray().Length; i++)
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{
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tmpd[i] = 0;
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}
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Array.Copy(n.ToByteArray(), 0, tmpd, 32 - n.ToByteArray().Length, n.ToByteArray().Length);
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}
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return tmpd;
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}
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private void Reset()
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{
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sm3keybase = new SM3Digest();
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sm3c3 = new SM3Digest();
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byte[] p = ByteConvert32Bytes(p2.Normalize().XCoord.ToBigInteger());
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sm3keybase.BlockUpdate(p, 0, p.Length);
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sm3c3.BlockUpdate(p, 0, p.Length);
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p = ByteConvert32Bytes(p2.Normalize().YCoord.ToBigInteger());
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sm3keybase.BlockUpdate(p, 0, p.Length);
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ct = 1;
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NextKey();
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}
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private void NextKey()
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{
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var sm3keycur = new SM3Digest(this.sm3keybase);
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sm3keycur.Update((byte)(ct >> 24 & 0xff));
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sm3keycur.Update((byte)(ct >> 16 & 0xff));
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sm3keycur.Update((byte)(ct >> 8 & 0xff));
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sm3keycur.Update((byte)(ct & 0xff));
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sm3keycur.DoFinal(key, 0);
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keyOff = 0;
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ct++;
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}
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public ECPoint Init_enc(SM2 sm2, ECPoint userKey)
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{
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AsymmetricCipherKeyPair key = sm2.ecc_key_pair_generator.GenerateKeyPair();
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ECPrivateKeyParameters ecpriv = (ECPrivateKeyParameters)key.Private;
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ECPublicKeyParameters ecpub = (ECPublicKeyParameters)key.Public;
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BigInteger k = ecpriv.D;
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ECPoint c1 = ecpub.Q;
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p2 = userKey.Multiply(k);
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Reset();
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return c1;
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}
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public void Encrypt(byte[] data)
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{
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sm3c3.BlockUpdate(data, 0, data.Length);
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for (int i = 0; i < data.Length; i++)
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{
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if (keyOff == key.Length)
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{
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NextKey();
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}
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data[i] ^= key[keyOff++];
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}
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}
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public void Init_dec(BigInteger userD, ECPoint c1)
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{
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p2 = c1.Multiply(userD);
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Reset();
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}
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public void Decrypt(byte[] data)
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{
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for (int i = 0; i < data.Length; i++)
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{
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if (keyOff == key.Length)
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{
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NextKey();
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}
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data[i] ^= key[keyOff++];
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}
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sm3c3.BlockUpdate(data, 0, data.Length);
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}
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public void Dofinal(byte[] c3)
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{
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byte[] p = ByteConvert32Bytes(p2.Normalize().YCoord.ToBigInteger());
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sm3c3.BlockUpdate(p, 0, p.Length);
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sm3c3.DoFinal(c3, 0);
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Reset();
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}
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}
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