BBIT-Kai
502 lines
19 KiB
C#
502 lines
19 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Text;
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using System.IO;
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using System.Security.Cryptography;
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namespace ConsoleDemo
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{
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internal class RSA
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{
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/**
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* content 签名前的报文
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* privateKey 私钥
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* input_charset 编码格式 (以下默认UTF-8)
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*/
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public static string sign(string content, string privateKey)
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{
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byte[] Data = Encoding.GetEncoding("UTF-8").GetBytes(content);
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RSACryptoServiceProvider rsa = DecodePemPrivateKey(privateKey);
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SHA1 sh = new SHA1CryptoServiceProvider();
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byte[] signData = rsa.SignData(Data, sh);
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return Convert.ToBase64String(signData);
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}
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/// <summary>
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/// 验签
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/// </summary>
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/// <param name="content">待验签字符串</param>
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/// <param name="signedString">签名</param>
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/// <param name="publicKey">公钥</param>
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/// <param name="input_charset">编码格式</param>
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/// <returns>true(通过)，false(不通过)</returns>
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public static bool verify(string content, string signedString, string publicKey, string input_charset)
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{
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bool result ;
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byte[] Data = Encoding.GetEncoding(input_charset).GetBytes(content);
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byte[] data = Convert.FromBase64String(signedString);
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RSAParameters paraPub = ConvertFromPublicKey(publicKey);
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RSACryptoServiceProvider rsaPub = new RSACryptoServiceProvider();
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rsaPub.ImportParameters(paraPub);
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SHA1 sh = new SHA1CryptoServiceProvider();
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result = rsaPub.VerifyData(Data, sh, data);
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return result;
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}
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/// <summary>
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/// 加密
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/// </summary>
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/// <param name="resData">需要加密的字符串</param>
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/// <param name="publicKey">公钥</param>
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/// <param name="input_charset">编码格式</param>
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/// <returns>明文</returns>
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public static string encryptData(string resData, string publicKey, string input_charset)
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{
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byte[] DataToEncrypt = Encoding.ASCII.GetBytes(resData);
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string result = encrypt(DataToEncrypt, publicKey, input_charset);
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return result;
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}
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/// <summary>
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/// 解密
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/// </summary>
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/// <param name="resData">加密字符串</param>
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/// <param name="privateKey">私钥</param>
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/// <param name="input_charset">编码格式</param>
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/// <returns>明文</returns>
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public static string decryptData(string resData, string privateKey, string input_charset)
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{
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byte[] DataToDecrypt = Convert.FromBase64String(resData);
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string result = "";
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for (int j = 0; j < DataToDecrypt.Length / 128; j++)
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{
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byte[] buf = new byte[128];
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for (int i = 0; i < 128; i++)
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{
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buf[i] = DataToDecrypt[i + 128 * j];
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}
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result += decrypt(buf, privateKey, input_charset);
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}
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return result;
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}
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#region 内部方法
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private static string encrypt(byte[] data, string publicKey, string input_charset)
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{
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RSACryptoServiceProvider rsa = DecodePemPublicKey(publicKey);
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SHA1 sh = new SHA1CryptoServiceProvider();
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byte[] result = rsa.Encrypt(data, false);
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return Convert.ToBase64String(result);
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}
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private static string decrypt(byte[] data, string privateKey, string input_charset)
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{
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string result = "";
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RSACryptoServiceProvider rsa = DecodePemPrivateKey(privateKey);
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SHA1 sh = new SHA1CryptoServiceProvider();
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byte[] source = rsa.Decrypt(data, false);
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char[] asciiChars = new char[Encoding.GetEncoding(input_charset).GetCharCount(source, 0, source.Length)];
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Encoding.GetEncoding(input_charset).GetChars(source, 0, source.Length, asciiChars, 0);
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result = new string(asciiChars);
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//result = ASCIIEncoding.ASCII.GetString(source);
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return result;
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}
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private static RSACryptoServiceProvider DecodePemPublicKey(String pemstr)
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{
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byte[] pkcs8publickkey;
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pkcs8publickkey = Convert.FromBase64String(pemstr);
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if (pkcs8publickkey != null)
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{
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RSACryptoServiceProvider rsa = DecodeRSAPublicKey(pkcs8publickkey);
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return rsa;
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}
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else
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return null;
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}
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private static RSACryptoServiceProvider DecodePemPrivateKey(String pemstr)
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{
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byte[] pkcs8privatekey;
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pkcs8privatekey = Convert.FromBase64String(pemstr);
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if (pkcs8privatekey != null)
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{
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RSACryptoServiceProvider rsa = DecodePrivateKeyInfo(pkcs8privatekey);
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return rsa;
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}
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else
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return null;
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}
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private static RSACryptoServiceProvider DecodePrivateKeyInfo(byte[] pkcs8)
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{
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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[] seq = new byte[15];
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MemoryStream mem = new MemoryStream(pkcs8);
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int lenstream = (int)mem.Length;
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BinaryReader binr = new BinaryReader(mem); //wrap Memory Stream with BinaryReader for easy reading
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byte bt = 0;
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ushort twobytes = 0;
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try
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{
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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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bt = binr.ReadByte();
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if (bt != 0x02)
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return null;
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twobytes = binr.ReadUInt16();
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if (twobytes != 0x0001)
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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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bt = binr.ReadByte();
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if (bt != 0x04) //expect an Octet string
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return null;
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bt = binr.ReadByte(); //read next byte, or next 2 bytes is 0x81 or 0x82; otherwise bt is the byte count
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if (bt == 0x81)
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binr.ReadByte();
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else
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if (bt == 0x82)
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binr.ReadUInt16();
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//------ at this stage, the remaining sequence should be the RSA private key
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byte[] rsaprivkey = binr.ReadBytes((int)(lenstream - mem.Position));
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RSACryptoServiceProvider rsacsp = DecodeRSAPrivateKey(rsaprivkey);
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return rsacsp;
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}
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catch (Exception)
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{
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return null;
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}
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finally { binr.Close(); }
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}
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private static 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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private static RSACryptoServiceProvider DecodeRSAPublicKey(byte[] publickey)
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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[] seq = new byte[15];
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// --------- Set up stream to read the asn.1 encoded SubjectPublicKeyInfo blob ------
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MemoryStream mem = new MemoryStream(publickey);
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BinaryReader binr = new BinaryReader(mem); //wrap Memory Stream with BinaryReader for easy reading
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byte bt = 0;
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ushort twobytes = 0;
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try
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{
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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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byte firstbyte = binr.ReadByte();
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binr.BaseStream.Seek(-1, SeekOrigin.Current);
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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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catch (Exception)
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{
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return null;
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}
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finally { binr.Close(); }
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}
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private static RSACryptoServiceProvider DecodeRSAPrivateKey(byte[] privkey)
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{
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byte[] MODULUS, E, D, P, Q, DP, DQ, IQ;
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// --------- Set up stream to decode the asn.1 encoded RSA private key ------
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MemoryStream mem = new MemoryStream(privkey);
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BinaryReader binr = new BinaryReader(mem); //wrap Memory Stream with BinaryReader for easy reading
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byte bt = 0;
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ushort twobytes = 0;
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int elems = 0;
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try
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{
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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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if (twobytes != 0x0102) //version number
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return null;
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bt = binr.ReadByte();
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if (bt != 0x00)
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return null;
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//------ all private key components are Integer sequences ----
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elems = GetIntegerSize(binr);
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MODULUS = binr.ReadBytes(elems);
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elems = GetIntegerSize(binr);
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E = binr.ReadBytes(elems);
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elems = GetIntegerSize(binr);
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D = binr.ReadBytes(elems);
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elems = GetIntegerSize(binr);
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P = binr.ReadBytes(elems);
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elems = GetIntegerSize(binr);
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Q = binr.ReadBytes(elems);
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elems = GetIntegerSize(binr);
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DP = binr.ReadBytes(elems);
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elems = GetIntegerSize(binr);
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DQ = binr.ReadBytes(elems);
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elems = GetIntegerSize(binr);
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IQ = binr.ReadBytes(elems);
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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 RSAparams = new RSAParameters();
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RSAparams.Modulus = MODULUS;
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RSAparams.Exponent = E;
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RSAparams.D = D;
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RSAparams.P = P;
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RSAparams.Q = Q;
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RSAparams.DP = DP;
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RSAparams.DQ = DQ;
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RSAparams.InverseQ = IQ;
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RSA.ImportParameters(RSAparams);
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return RSA;
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}
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catch (Exception)
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{
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return null;
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}
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finally { binr.Close(); }
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}
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private static 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) //expect integer
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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(); // data size in next byte
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else
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if (bt == 0x82)
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{
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highbyte = binr.ReadByte(); // data size in next 2 bytes
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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; // we already have the data size
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}
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while (binr.ReadByte() == 0x00)
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{ //remove high order zeros in data
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count -= 1;
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}
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binr.BaseStream.Seek(-1, SeekOrigin.Current); //last ReadByte wasn't a removed zero, so back up a byte
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return count;
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}
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#endregion
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#region 解析.net 生成的Pem
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private static RSAParameters ConvertFromPublicKey(string pemFileConent)
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{
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byte[] keyData = Convert.FromBase64String(pemFileConent);
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if (keyData.Length < 162)
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{
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throw new ArgumentException("pem file content is incorrect.");
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}
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byte[] pemModulus = new byte[128];
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byte[] pemPublicExponent = new byte[3];
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Array.Copy(keyData, 29, pemModulus, 0, 128);
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Array.Copy(keyData, 159, pemPublicExponent, 0, 3);
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RSAParameters para = new RSAParameters();
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para.Modulus = pemModulus;
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para.Exponent = pemPublicExponent;
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return para;
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}
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private static RSAParameters ConvertFromPrivateKey(string pemFileConent)
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{
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byte[] keyData = Convert.FromBase64String(pemFileConent);
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if (keyData.Length < 609)
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{
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throw new ArgumentException("pem file content is incorrect.");
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}
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int index = 11;
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byte[] pemModulus = new byte[128];
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Array.Copy(keyData, index, pemModulus, 0, 128);
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index += 128;
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index += 2;//141
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byte[] pemPublicExponent = new byte[3];
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Array.Copy(keyData, index, pemPublicExponent, 0, 3);
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index += 3;
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index += 4;//148
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byte[] pemPrivateExponent = new byte[128];
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Array.Copy(keyData, index, pemPrivateExponent, 0, 128);
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index += 128;
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index += ((int)keyData[index + 1] == 64 ? 2 : 3);//279
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byte[] pemPrime1 = new byte[64];
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Array.Copy(keyData, index, pemPrime1, 0, 64);
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index += 64;
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index += ((int)keyData[index + 1] == 64 ? 2 : 3);//346
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byte[] pemPrime2 = new byte[64];
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Array.Copy(keyData, index, pemPrime2, 0, 64);
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index += 64;
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index += ((int)keyData[index + 1] == 64 ? 2 : 3);//412/413
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byte[] pemExponent1 = new byte[64];
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Array.Copy(keyData, index, pemExponent1, 0, 64);
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index += 64;
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index += ((int)keyData[index + 1] == 64 ? 2 : 3);//479/480
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byte[] pemExponent2 = new byte[64];
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Array.Copy(keyData, index, pemExponent2, 0, 64);
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index += 64;
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index += ((int)keyData[index + 1] == 64 ? 2 : 3);//545/546
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byte[] pemCoefficient = new byte[64];
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Array.Copy(keyData, index, pemCoefficient, 0, 64);
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RSAParameters para = new RSAParameters();
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para.Modulus = pemModulus;
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para.Exponent = pemPublicExponent;
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para.D = pemPrivateExponent;
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para.P = pemPrime1;
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para.Q = pemPrime2;
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para.DP = pemExponent1;
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para.DQ = pemExponent2;
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para.InverseQ = pemCoefficient;
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return para;
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}
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#endregion
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}
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} |