C# 实现SHA1withRSA

对称加密(DES、3DES)、非对称加密(RSA、SHA1withRSA)

参考: https://blog.csdn.net/sinat_16998945/article/details/94639023

#

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：https://docs.open.alipay.com/291/105971/

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 reading
            byte 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 byte
                else if (twobytes == 0x8230)
                    binr.ReadInt16(); //advance 2 bytes
                else
                    return null;
                twobytes = binr.ReadUInt16();
                if (twobytes != 0x0102) //version number
                    return 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 integer
                return 0;
            bt = binr.ReadByte();
            if (bt == 0x81)
                count = binr.ReadByte();    // data size in next byte
            else
            if (bt == 0x82)
            {
                highbyte = binr.ReadByte(); // data size in next 2 bytes
                lowbyte = 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 data
                count -= 1;
            }
            binr.BaseStream.Seek(-1, SeekOrigin.Current);   //last ReadByte wasn't a removed zero, so back up a byte
            return count;
        }
        #endregion
        #region 生成的Pem
        private 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
    }
}