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| public class RSAHelper { private readonly RSA_privateKeyRsaProvider; private readonly RSA_publicKeyRsaProvider;
private readonly HashAlgorithmName_hashAlgorithmName;
private readonly Encoding _encoding;
public RSAHelper(RSAType rsaType,Encoding encoding,string privateKey,string publicKey = null) { _encoding = encoding; if(!string.IsNullOrEmpty(privateKey)) { _privateKeyRsaProvider = CreateRsaProviderFromPrivateKey(privateKey); } if(!string.IsNullOrEmpty(publicKey)) { _publicKeyRsaProvider = CreateRsaProviderFromPublicKey(publicKey); }
_hashAlgorithName = rsaType == RSAType.RSA?HashAlgorithmName.SHA1:HashAlgorithName.SHA256; }
public string Sign(string data) { byte[] dataBytes = _encoding.GetBytes(data);
var signatureBytes = _privateKeyRsaProvider.SignData(dataBytes,_hashAlgorithmName,RSASignaturePadding.Pkcs1); return Convert.ToBase64String(signatureBytes); }
public bool Verify(stringt data,string sign) { byte[] dataBytes = _encoding.GetBytes(data);
byte[] signBytes = Convert.FromBase64String(sign); var verify = _publicKeyRsaProvider.VerifyData(dataBytes,signBytes,_hashAlgorithmName,RSASignaturePadding.Pkcs1); return varify; }
public string Decrypt(string cipherText) { if(_privateKeyRsaProvider == null) { throw new Exception("_privateKeyRsaProvider is null"); } return Encoding.UTF8.GetString(_privateKeyRsaProvider.Decrypt(Convert.FromBase64String(cipherText), RSAEncryptionPadding.Pkcs1)); }
public string Encrypt(string text) { if(_publicKeyRsaProvider == null) { throw new Exception("_publicKeyRsaProvider is null"); } return Convert.ToBase64String(_publicKeyRsaProvider.Encrypt(Encoding.UTF8.GetBytes(text), RSAEncryptionPadding.Pkcs1)); }
public RSA CreateRsaProviderFromPrivateKey(string privateKey) { var privateKeyBits = Convert.FromBase64String(privateKey); var rsa = RSA.Create(); var rsaParameters = new RSAParameters(); using (BinaryReader binr = new BinaryReader(new MemoryStream(privateKeyBits))) { byte bt = 0; ushort twobytes = 0; twobytes = binr.ReadUInt16(); if (twobytes == 0x8130) { binr.ReadByte(); } else if (twobytes == 0x8230) { binr.ReadInt16(); } else { throw new Exception("Unexpected value read binr.ReadUInt16()"); } twobytes = binr.ReadUInt16(); if (twobytes != 0x0102) { throw new Exception("Unexpected version"); } bt = binr.ReadByte();
if (bt != 0x00) { throw new Exception("Unexpected value read binr.ReadByte()"); } rsaParameters.Modulus = binr.ReadBytes(GetIntegerSize(binr)); rsaParameters.Exponent = binr.ReadBytes(GetIntegerSize(binr)); rsaParameters.D = binr.ReadBytes(GetIntegerSize(binr)); rsaParameters.P = binr.ReadBytes(GetIntegerSize(binr)); rsaParameters.Q = binr.ReadBytes(GetIntegerSize(binr)); rsaParameters.DP = binr.ReadBytes(GetIntegerSize(binr)); rsaParameters.DQ = binr.ReadBytes(GetIntegerSize(binr)); rsaParameters.InverseQ = binr.ReadBytes(GetIntegerSize(binr)); } rsa.ImportParameters(rsaParameters); return rsa; } public RSA CreateRsaProviderFromPublicKey(string publicKeyString) { byte[] seqOid = { 0x30, 0x0D, 0x06, 0x09, 0x2A, 0x86, 0x48, 0x86, 0xF7, 0x0D, 0x01, 0x01, 0x01, 0x05, 0x00 };
byte[] seq = new byte[15];
var x509Key = Convert.FromBase64String(publicKeyString); using (MemoryStream mem = new MemoryStream(x509Key)) { using (BinaryReader binr = new BinaryReader(mem)) { byte bt = 0; ushort twobytes = 0; twobytes = binr.ReadUInt16(); if (twobytes == 0x8130) { binr.ReadByte(); } else if (twobytes == 0x8230) { binr.ReadInt16(); } else { return null; } seq = binr.ReadBytes(15); if (!CompareBytearrays(seq, seqOid)) { return null; } twobytes = binr.ReadUInt16(); if (twobytes == 0x8103) { binr.ReadByte(); } else if (twobytes == 0x8203) { binr.ReadInt16(); } else { return null; } bt = binr.ReadByte(); if (bt != 0x00) { return null; } twobytes = binr.ReadUInt16(); if (twobytes == 0x8130) { binr.ReadByte(); } else if (twobytes == 0x8230) { binr.ReadInt16(); } else { return null; } twobytes = binr.ReadUInt16(); byte lowbyte = 0x00; byte highbyte = 0x00; if (twobytes == 0x8102) { lowbyte = binr.ReadByte(); } else if (twobytes == 0x8202) { highbyte = binr.ReadByte(); lowbyte = binr.ReadByte(); } else { return null; }
byte[] modint = { lowbyte, highbyte, 0x00, 0x00 }; int modsize = BitConverter.ToInt32(modint, 0); int firstbyte = binr.PeekChar();
if (firstbyte == 0x00) { binr.ReadByte(); modsize -= 1; byte[] modulus = binr.ReadBytes(modsize); if (binr.ReadByte() != 0x02) { return null; }
int expbytes = (int)binr.ReadByte();
byte[] exponent = binr.ReadBytes(expbytes); var rsa = RSA.Create(); RSAParameters rsaKeyInfo = new RSAParameters { Modulus = modulus, Exponent = exponent }; rsa.ImportParameters(rsaKeyInfo); return rsa; } } } private int GetIntegerSize(BinaryReader binr) { byte bt = 0; int count = 0; bt = binr.ReadByte();
if (bt != 0x02) { return 0; } bt = binr.ReadByte(); if (bt == 0x81) { count = binr.ReadByte(); } else if (bt == 0x82) { var highbyte = binr.ReadByte(); var lowbyte = binr.ReadByte(); byte[] modint = { lowbyte, highbyte, 0x00, 0x00 }; count = BitConverter.ToInt32(modint, 0); } else { count = bt; } while (binr.ReadByte() == 0x00) { count -= 1; } binr.BaseStream.Seek(-1, SeekOrigin.Current); return count; } private bool CompareBytearrays(byte[] a, byte[] b) { if (a.Length != b.Length) { return false; } int i = 0;
foreach (byte c in a) { if (c != b[i]) { return false; } i++; } return true; } }
public enum RSAType { RSA = 0, RSA2 } }
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