C# 实现SHA1withRSA

对称加密(DES、3DES)、非对称加密(RSA、SHA1withRSA)

参考: 对称加密(DES、3DES)、非对称加密(RSA、SHA1withRSA)_预立数据科技-CSDN博客

一、支付宝工具生成公钥私钥

下载地址链接: https://pan.baidu.com/s/15L1GM8mK43tzV9XyyNEV8Q

提取码: vux3

使用方法可参考阿里文档：网页&移动应用学习路径｜网页&移动应用

二、加密

说明：1.使用私钥签名， 2.签名后每次结果是不变的

三、解密

说明：1.使用公钥验证签名

四、实现代码

利用工具可生成公私秘钥，注意(java版本与非java版本)

1.公钥 "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCO772dmiRP4HaddeZTUieS4SWrNnbRPIgxoF5wLZNK1nel3hf7uffWkZ5lzjSuLig5sgPzU/oQgophIG9+NwoHeyXPgnhNV8zPluueHFrQzrSnq9jhUS1yxTezmYr+oxAQIyGQUZO21Sg1+2lqDyatPpRfN4JSKusAw9yOcbkHKQIDAQAB"

2.私钥 "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"

3.加密调用：SHA1withRSA.Sign("待签名字符串", "私钥", "UTF-8");

4.解密调用：SHA1withRSA.Verify("待签名字符串", "签名后字符串", "公钥 ", "UTF-8");

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;namespace Common
{public  class SHA1withRSA{/// <summary>/// SHA1withRSA签名/// </summary>/// <param name="content">待签名字符串</param>/// <param name="privateKey">私钥</param>/// <param name="input_charset">编码格式</param>/// <returns>签名后字符串</returns>public static string Sign(string content, string privateKey, string input_charset){byte[] Data = Encoding.GetEncoding(input_charset).GetBytes(content);RSACryptoServiceProvider rsa = DecodePemPrivateKey(privateKey);using (var sh = SHA1.Create()){byte[] signData = rsa.SignData(Data, sh);return Convert.ToBase64String(signData);}}/// <summary>/// pem格式公钥验签/// </summary>/// <param name="content">待验签字符串</param>/// <param name="signedString">签名</param>/// <param name="publicKey">公钥</param>/// <param name="input_charset">编码格式</param>/// <returns>true(通过)，false(不通过)</returns>public static bool Verify(string content, string signedString, string publicKey, string input_charset){bool result = false;byte[] Data = Encoding.GetEncoding(input_charset).GetBytes(content);byte[] data = Convert.FromBase64String(signedString);RSAParameters paraPub = ConvertFromPublicKey(publicKey);RSACryptoServiceProvider rsaPub = new RSACryptoServiceProvider();rsaPub.ImportParameters(paraPub);using (var sh = SHA1.Create()){result = rsaPub.VerifyData(Data, sh, data);return result;}}#region 内部方法private static RSACryptoServiceProvider DecodePemPrivateKey(String pemstr){RSACryptoServiceProvider rsa = DecodeRSAPrivateKey(Convert.FromBase64String(pemstr));return rsa;}private static RSACryptoServiceProvider DecodeRSAPrivateKey(byte[] privkey){byte[] MODULUS, E, D, P, Q, DP, DQ, IQ;// --------- Set up stream to decode the asn.1 encoded RSA private key ------MemoryStream mem = new MemoryStream(privkey);BinaryReader binr = new BinaryReader(mem); //wrap Memory Stream with BinaryReader for easy readingbyte bt = 0;ushort twobytes = 0;int elems = 0;try{twobytes = binr.ReadUInt16();if (twobytes == 0x8130) //data read as little endian order (actual data order for Sequence is 30 81)binr.ReadByte(); //advance 1 byteelse if (twobytes == 0x8230)binr.ReadInt16(); //advance 2 byteselsereturn null;twobytes = binr.ReadUInt16();if (twobytes != 0x0102) //version numberreturn null;bt = binr.ReadByte();if (bt != 0x00)return null;//------ all private key components are Integer sequences ----elems = GetIntegerSize(binr);MODULUS = binr.ReadBytes(elems);elems = GetIntegerSize(binr);E = binr.ReadBytes(elems);elems = GetIntegerSize(binr);D = binr.ReadBytes(elems);elems = GetIntegerSize(binr);P = binr.ReadBytes(elems);elems = GetIntegerSize(binr);Q = binr.ReadBytes(elems);elems = GetIntegerSize(binr);DP = binr.ReadBytes(elems);elems = GetIntegerSize(binr);DQ = binr.ReadBytes(elems);elems = GetIntegerSize(binr);IQ = binr.ReadBytes(elems);// ------- create RSACryptoServiceProvider instance and initialize with public key -----CspParameters CspParameters = new CspParameters();CspParameters.Flags = CspProviderFlags.UseMachineKeyStore;RSACryptoServiceProvider RSA = new RSACryptoServiceProvider(1024, CspParameters);RSAParameters RSAparams = new RSAParameters();RSAparams.Modulus = MODULUS;RSAparams.Exponent = E;RSAparams.D = D;RSAparams.P = P;RSAparams.Q = Q;RSAparams.DP = DP;RSAparams.DQ = DQ;RSAparams.InverseQ = IQ;RSA.ImportParameters(RSAparams);return RSA;}catch{return null;}finally{binr.Dispose();}}private static int GetIntegerSize(BinaryReader binr){byte bt = 0;byte lowbyte = 0x00;byte highbyte = 0x00;int count = 0;bt = binr.ReadByte();if (bt != 0x02) //expect integerreturn 0;bt = binr.ReadByte();if (bt == 0x81)count = binr.ReadByte();    // data size in next byteelseif (bt == 0x82){highbyte = binr.ReadByte(); // data size in next 2 byteslowbyte = binr.ReadByte();byte[] modint = { lowbyte, highbyte, 0x00, 0x00 };count = BitConverter.ToInt32(modint, 0);}else{count = bt; // we already have the data size}while (binr.ReadByte() == 0x00){   //remove high order zeros in datacount -= 1;}binr.BaseStream.Seek(-1, SeekOrigin.Current);   //last ReadByte wasn't a removed zero, so back up a bytereturn count;}#endregion#region 生成的Pemprivate static RSAParameters ConvertFromPublicKey(string pemFileConent){if (string.IsNullOrEmpty(pemFileConent)){throw new ArgumentNullException("pemFileConent", "This arg cann't be empty.");}pemFileConent = pemFileConent.Replace("-----BEGIN PUBLIC KEY-----", "").Replace("-----END PUBLIC KEY-----", "").Replace("\n", "").Replace("\r", "");byte[] keyData = Convert.FromBase64String(pemFileConent);bool keySize1024 = (keyData.Length == 162);bool keySize2048 = (keyData.Length == 294);if (!(keySize1024 || keySize2048)){throw new ArgumentException("pem file content is incorrect, Only support the key size is 1024 or 2048");}byte[] pemModulus = (keySize1024 ? new byte[128] : new byte[256]);byte[] pemPublicExponent = new byte[3];Array.Copy(keyData, (keySize1024 ? 29 : 33), pemModulus, 0, (keySize1024 ? 128 : 256));Array.Copy(keyData, (keySize1024 ? 159 : 291), pemPublicExponent, 0, 3);RSAParameters para = new RSAParameters();para.Modulus = pemModulus;para.Exponent = pemPublicExponent;return para;}#endregion}
}

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