271 lines
8.9 KiB
C#
271 lines
8.9 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Web;
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using System.Security.Cryptography;
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using System.Text;
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using System.Threading.Tasks;
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using System.IO;
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namespace NGTools.Tools
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{
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/// <summary>
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/// AJax提交参数加密帮助类
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/// </summary>
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public class JsEncryptHelper
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{
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private const string defaultprivateKey = @"MIICXAIBAAKBgQCC0hrRIjb3noDWNtbDpANbjt5Iwu2NFeDwU16Ec87ToqeoIm2K
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I+cOs81JP9aTDk/jkAlU97mN8wZkEMDr5utAZtMVht7GLX33Wx9XjqxUsDfsGkqN
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L8dXJklWDu9Zh80Ui2Ug+340d5dZtKtd+nv09QZqGjdnSp9PTfFDBY133QIDAQAB
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AoGAJBNTOITaP6LCyKVKyEdnHaKNAz0DS+V9UwjKhyAgfcAxwm3sDdd6FQCEW0TI
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JA7Np7rFYrGwcR1UOoKxkNxB10ACl6JX4rE7xKS6NLZumdwxON/KgDb+2SQtWEXD
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gBySZ7Znv/FhEp1RmoBDjZ05E99kILWO3ToorUM0Eq2GHQkCQQCnUMXgZa4HS0tu
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INzysgB37d7ene9+CIARyJphs079qao2UWCgXqen43Ob6GJUgulz7We+4JOZFld0
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TfEi1E5rAkEAyClQAVzafLO3gXgqH7tbRbPPx788+4opxT9QBo2Trzl6/3FlcC1P
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IZeqbQ/Oc2wT7jmidFnpyTEnM2p7Yq3U1wJBAILTWaX4W3dAnJ5j+9+Y51zfFiEj
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hRwbMWi2XmB+gAlAHOOUBeXfnWBdLQx/TEOgiUIoI7LQjxhoq8E5II+HSjkCQDlK
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SdH6B7dFoTJ3eGcYsykiLEiZ3hSJGSeR1Y/qmei/ZQsUI9qVvV56EJeivI6g0puO
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94ah7Z5eaT/4LFS0OIUCQDgLn586pGgeidLhQsIe/AR3y9YOCAygTFLxzmeBXOKt
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M90q4516KWlTtK2u99442mNi7hNmjryBVwk62foWo8w=";
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private const string defaultpublicKey = @"MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCC0hrRIjb3noDWNtbDpANbjt5I
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wu2NFeDwU16Ec87ToqeoIm2KI+cOs81JP9aTDk/jkAlU97mN8wZkEMDr5utAZtMV
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ht7GLX33Wx9XjqxUsDfsGkqNL8dXJklWDu9Zh80Ui2Ug+340d5dZtKtd+nv09QZq
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GjdnSp9PTfFDBY133QIDAQAB";
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private RSACryptoServiceProvider _privateKeyRsaProvider;
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private RSACryptoServiceProvider _publicKeyRsaProvider;
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public JsEncryptHelper(string privateKey = "", string publicKey = "")
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{
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if (string.IsNullOrEmpty(privateKey))
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{
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privateKey = defaultprivateKey;
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}
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if (string.IsNullOrEmpty(publicKey))
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{
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publicKey = defaultpublicKey;
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}
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if (!string.IsNullOrEmpty(privateKey))
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{
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_privateKeyRsaProvider = CreateRsaProviderFromPrivateKey(privateKey);
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}
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if (!string.IsNullOrEmpty(publicKey))
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{
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_publicKeyRsaProvider = CreateRsaProviderFromPublicKey(publicKey);
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}
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}
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public string Decrypt(string cipherText)
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{
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if (_privateKeyRsaProvider == null)
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{
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throw new Exception("_privateKeyRsaProvider is null");
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}
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if (string.IsNullOrEmpty(cipherText))
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{
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return "";
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}
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return Encoding.UTF8.GetString(_privateKeyRsaProvider.Decrypt(System.Convert.FromBase64String(cipherText), false));
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}
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public string Encrypt(string text)
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{
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if (_publicKeyRsaProvider == null)
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{
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throw new Exception("_publicKeyRsaProvider is null");
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}
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return Convert.ToBase64String(_publicKeyRsaProvider.Encrypt(Encoding.UTF8.GetBytes(text), false));
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}
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private RSACryptoServiceProvider CreateRsaProviderFromPrivateKey(string privateKey)
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{
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var privateKeyBits = System.Convert.FromBase64String(privateKey);
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var RSA = new RSACryptoServiceProvider();
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var RSAparams = new RSAParameters();
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using (BinaryReader binr = new BinaryReader(new MemoryStream(privateKeyBits)))
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{
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byte bt = 0;
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ushort twobytes = 0;
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twobytes = binr.ReadUInt16();
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if (twobytes == 0x8130)
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binr.ReadByte();
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else if (twobytes == 0x8230)
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binr.ReadInt16();
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else
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throw new Exception("Unexpected value read binr.ReadUInt16()");
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twobytes = binr.ReadUInt16();
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if (twobytes != 0x0102)
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throw new Exception("Unexpected version");
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bt = binr.ReadByte();
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if (bt != 0x00)
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throw new Exception("Unexpected value read binr.ReadByte()");
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RSAparams.Modulus = binr.ReadBytes(GetIntegerSize(binr));
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RSAparams.Exponent = binr.ReadBytes(GetIntegerSize(binr));
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RSAparams.D = binr.ReadBytes(GetIntegerSize(binr));
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RSAparams.P = binr.ReadBytes(GetIntegerSize(binr));
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RSAparams.Q = binr.ReadBytes(GetIntegerSize(binr));
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RSAparams.DP = binr.ReadBytes(GetIntegerSize(binr));
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RSAparams.DQ = binr.ReadBytes(GetIntegerSize(binr));
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RSAparams.InverseQ = binr.ReadBytes(GetIntegerSize(binr));
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}
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RSA.ImportParameters(RSAparams);
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return RSA;
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}
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private int GetIntegerSize(BinaryReader binr)
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{
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byte bt = 0;
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byte lowbyte = 0x00;
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byte highbyte = 0x00;
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int count = 0;
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bt = binr.ReadByte();
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if (bt != 0x02)
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return 0;
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bt = binr.ReadByte();
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if (bt == 0x81)
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count = binr.ReadByte();
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else
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if (bt == 0x82)
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{
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highbyte = binr.ReadByte();
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lowbyte = binr.ReadByte();
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byte[] modint = { lowbyte, highbyte, 0x00, 0x00 };
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count = BitConverter.ToInt32(modint, 0);
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}
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else
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{
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count = bt;
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}
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while (binr.ReadByte() == 0x00)
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{
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count -= 1;
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}
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binr.BaseStream.Seek(-1, SeekOrigin.Current);
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return count;
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}
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private RSACryptoServiceProvider CreateRsaProviderFromPublicKey(string publicKeyString)
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{
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// encoded OID sequence for PKCS #1 rsaEncryption szOID_RSA_RSA = "1.2.840.113549.1.1.1"
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byte[] SeqOID = { 0x30, 0x0D, 0x06, 0x09, 0x2A, 0x86, 0x48, 0x86, 0xF7, 0x0D, 0x01, 0x01, 0x01, 0x05, 0x00 };
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byte[] x509key;
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byte[] seq = new byte[15];
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int x509size;
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x509key = Convert.FromBase64String(publicKeyString);
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x509size = x509key.Length;
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// --------- Set up stream to read the asn.1 encoded SubjectPublicKeyInfo blob ------
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using (MemoryStream mem = new MemoryStream(x509key))
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{
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using (BinaryReader binr = new BinaryReader(mem)) //wrap Memory Stream with BinaryReader for easy reading
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{
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byte bt = 0;
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ushort twobytes = 0;
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twobytes = binr.ReadUInt16();
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if (twobytes == 0x8130) //data read as little endian order (actual data order for Sequence is 30 81)
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binr.ReadByte(); //advance 1 byte
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else if (twobytes == 0x8230)
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binr.ReadInt16(); //advance 2 bytes
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else
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return null;
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seq = binr.ReadBytes(15); //read the Sequence OID
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if (!CompareBytearrays(seq, SeqOID)) //make sure Sequence for OID is correct
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return null;
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twobytes = binr.ReadUInt16();
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if (twobytes == 0x8103) //data read as little endian order (actual data order for Bit String is 03 81)
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binr.ReadByte(); //advance 1 byte
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else if (twobytes == 0x8203)
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binr.ReadInt16(); //advance 2 bytes
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else
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return null;
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bt = binr.ReadByte();
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if (bt != 0x00) //expect null byte next
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return null;
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twobytes = binr.ReadUInt16();
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if (twobytes == 0x8130) //data read as little endian order (actual data order for Sequence is 30 81)
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binr.ReadByte(); //advance 1 byte
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else if (twobytes == 0x8230)
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binr.ReadInt16(); //advance 2 bytes
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else
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return null;
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twobytes = binr.ReadUInt16();
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byte lowbyte = 0x00;
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byte highbyte = 0x00;
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if (twobytes == 0x8102) //data read as little endian order (actual data order for Integer is 02 81)
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lowbyte = binr.ReadByte(); // read next bytes which is bytes in modulus
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else if (twobytes == 0x8202)
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{
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highbyte = binr.ReadByte(); //advance 2 bytes
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lowbyte = binr.ReadByte();
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}
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else
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return null;
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byte[] modint = { lowbyte, highbyte, 0x00, 0x00 }; //reverse byte order since asn.1 key uses big endian order
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int modsize = BitConverter.ToInt32(modint, 0);
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int firstbyte = binr.PeekChar();
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if (firstbyte == 0x00)
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{ //if first byte (highest order) of modulus is zero, don't include it
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binr.ReadByte(); //skip this null byte
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modsize -= 1; //reduce modulus buffer size by 1
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}
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byte[] modulus = binr.ReadBytes(modsize); //read the modulus bytes
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if (binr.ReadByte() != 0x02) //expect an Integer for the exponent data
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return null;
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int expbytes = (int)binr.ReadByte(); // should only need one byte for actual exponent data (for all useful values)
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byte[] exponent = binr.ReadBytes(expbytes);
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// ------- create RSACryptoServiceProvider instance and initialize with public key -----
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RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
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RSAParameters RSAKeyInfo = new RSAParameters();
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RSAKeyInfo.Modulus = modulus;
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RSAKeyInfo.Exponent = exponent;
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RSA.ImportParameters(RSAKeyInfo);
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return RSA;
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}
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}
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}
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private bool CompareBytearrays(byte[] a, byte[] b)
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{
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if (a.Length != b.Length)
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return false;
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int i = 0;
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foreach (byte c in a)
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{
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if (c != b[i])
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return false;
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i++;
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}
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return true;
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}
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}
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}
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