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RsaProvider.cs
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using NETCore.Encrypt.Extensions.Internal;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
namespace NETCore.Encrypt.Internal
{
/// <summary>
/// RSA provider
///
/// https://github.com/xiangyuecn/RSA-csharp
/// </summary>
internal class RsaProvider
{
static private Regex _PEMCode = new Regex(@"--+.+?--+|\s+");
static private byte[] _SeqOID = new byte[] { 0x30, 0x0D, 0x06, 0x09, 0x2A, 0x86, 0x48, 0x86, 0xF7, 0x0D, 0x01, 0x01, 0x01, 0x05, 0x00 };
static private byte[] _Ver = new byte[] { 0x02, 0x01, 0x00 };
/// <summary>
/// Convert pem to rsa，support PKCS#1、PKCS#8
/// </summary>
internal static RSA FromPem(string pem)
{
//var rsaParams = new CspParameters();
//rsaParams.Flags = CspProviderFlags.UseMachineKeyStore;
//var rsa = new RSACryptoServiceProvider(rsaParams);
var rsa = RSA.Create();
var param = new RSAParameters();
var base64 = _PEMCode.Replace(pem, "");
var data = Convert.FromBase64String(base64);
if (data == null)
{
throw new Exception("Pem content invalid ");
}
var idx = 0;
//read length
Func<byte, int> readLen = (first) =>
{
if (data[idx] == first)
{
idx++;
if (data[idx] == 0x81)
{
idx++;
return data[idx++];
}
else if (data[idx] == 0x82)
{
idx++;
return (((int)data[idx++]) << 8) + data[idx++];
}
else if (data[idx] < 0x80)
{
return data[idx++];
}
}
throw new Exception("Not found any content in pem file");
};
//read module length
Func<byte[]> readBlock = () =>
{
var len = readLen(0x02);
if (data[idx] == 0x00)
{
idx++;
len--;
}
var val = data.Sub(idx, len);
idx += len;
return val;
};
Func<byte[], bool> eq = (byts) =>
{
for (var i = 0; i < byts.Length; i++, idx++)
{
if (idx >= data.Length)
{
return false;
}
if (byts[i] != data[idx])
{
return false;
}
}
return true;
};
if (pem.Contains("PUBLIC KEY"))
{
/****Use public key****/
readLen(0x30);
if (!eq(_SeqOID))
{
throw new Exception("Unknown pem format");
}
readLen(0x03);
idx++;
readLen(0x30);
//Modulus
param.Modulus = readBlock();
//Exponent
param.Exponent = readBlock();
}
else if (pem.Contains("PRIVATE KEY"))
{
/****Use private key****/
readLen(0x30);
//Read version
if (!eq(_Ver))
{
throw new Exception("Unknown pem version");
}
//Check PKCS8
var idx2 = idx;
if (eq(_SeqOID))
{
//Read one byte
readLen(0x04);
readLen(0x30);
//Read version
if (!eq(_Ver))
{
throw new Exception("Pem version invalid");
}
}
else
{
idx = idx2;
}
//Reda data
param.Modulus = readBlock();
param.Exponent = readBlock();
param.D = readBlock();
param.P = readBlock();
param.Q = readBlock();
param.DP = readBlock();
param.DQ = readBlock();
param.InverseQ = readBlock();
}
else
{
throw new Exception("pem need 'BEGIN' and 'END'");
}
rsa.ImportParameters(param);
return rsa;
}
/// <summary>
/// Converter Rsa to pem ,
/// </summary>
/// <param name="rsa"><see cref="RSACryptoServiceProvider"/></param>
/// <param name="includePrivateParameters">if false only return publick key</param>
/// <param name="isPKCS8">default is false,if true return PKCS#8 pem else return PKCS#1 pem </param>
/// <returns></returns>
internal static string ToPem(RSA rsa, bool includePrivateParameters, bool isPKCS8 = false)
{
var ms = new MemoryStream();
Action<int> writeLenByte = (len) =>
{
if (len < 0x80)
{
ms.WriteByte((byte)len);
}
else if (len <= 0xff)
{
ms.WriteByte(0x81);
ms.WriteByte((byte)len);
}
else
{
ms.WriteByte(0x82);
ms.WriteByte((byte)(len >> 8 & 0xff));
ms.WriteByte((byte)(len & 0xff));
}
};
//write moudle data
Action<byte[]> writeBlock = (byts) =>
{
var addZero = (byts[0] >> 4) >= 0x8;
ms.WriteByte(0x02);
var len = byts.Length + (addZero ? 1 : 0);
writeLenByte(len);
if (addZero)
{
ms.WriteByte(0x00);
}
ms.Write(byts, 0, byts.Length);
};
Func<int, byte[], byte[]> writeLen = (index, byts) =>
{
var len = byts.Length - index;
ms.SetLength(0);
ms.Write(byts, 0, index);
writeLenByte(len);
ms.Write(byts, index, len);
return ms.ToArray();
};
if (!includePrivateParameters)
{
/****Create public key****/
var param = rsa.ExportParameters(false);
ms.WriteByte(0x30);
var index1 = (int)ms.Length;
// Encoded OID sequence for PKCS #1 rsaEncryption szOID_RSA_RSA = "1.2.840.113549.1.1.1"
ms.WriteAll(_SeqOID);
//Start with 0x00
ms.WriteByte(0x03);
var index2 = (int)ms.Length;
ms.WriteByte(0x00);
//Content length
ms.WriteByte(0x30);
var index3 = (int)ms.Length;
//Write Modulus
writeBlock(param.Modulus);
//Write Exponent
writeBlock(param.Exponent);
var bytes = ms.ToArray();
bytes = writeLen(index3, bytes);
bytes = writeLen(index2, bytes);
bytes = writeLen(index1, bytes);
return "-----BEGIN PUBLIC KEY-----\n" + TextBreak(Convert.ToBase64String(bytes), 64) + "\n-----END PUBLIC KEY-----";
}
else
{
/****Create private key****/
var param = rsa.ExportParameters(true);
//Write total length
ms.WriteByte(0x30);
int index1 = (int)ms.Length;
//Write version
ms.WriteAll(_Ver);
//PKCS8
int index2 = -1, index3 = -1;
if (isPKCS8)
{
ms.WriteAll(_SeqOID);
ms.WriteByte(0x04);
index2 = (int)ms.Length;
ms.WriteByte(0x30);
index3 = (int)ms.Length;
ms.WriteAll(_Ver);
}
//Write data
writeBlock(param.Modulus);
writeBlock(param.Exponent);
writeBlock(param.D);
writeBlock(param.P);
writeBlock(param.Q);
writeBlock(param.DP);
writeBlock(param.DQ);
writeBlock(param.InverseQ);
var bytes = ms.ToArray();
if (index2 != -1)
{
bytes = writeLen(index3, bytes);
bytes = writeLen(index2, bytes);
}
bytes = writeLen(index1, bytes);
var flag = " PRIVATE KEY";
if (!isPKCS8)
{
flag = " RSA" + flag;
}
return "-----BEGIN" + flag + "-----\n" + TextBreak(Convert.ToBase64String(bytes), 64) + "\n-----END" + flag + "-----";
}
}
/// <summary>
/// Text break method
/// </summary>
private static string TextBreak(string text, int line)
{
var idx = 0;
var len = text.Length;
var str = new StringBuilder();
while (idx < len)
{
if (idx > 0)
{
str.Append('\n');
}
if (idx + line >= len)
{
str.Append(text.Substring(idx));
}
else
{
str.Append(text.Substring(idx, line));
}
idx += line;
}
return str.ToString();
}
}
}