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juipnet/Infrastructure/ServiceClient/Alipay.AopSdk.Core/Util/AlipaySignature.cs

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2020-12-28 14:55:48 +08:00
using System;
using System.Collections.Generic;
using System.IO;
using System.Security.Cryptography;
using System.Text;
namespace Alipay.AopSdk.Core.Util
{
public class AlipaySignature
{
/** 默认编码字符集 */
private static readonly string DEFAULT_CHARSET = "utf-8";
public static string GetSignContent(IDictionary<string, string> parameters)
{
// 第一步：把字典按Key的字母顺序排序
IDictionary<string, string> sortedParams = new SortedDictionary<string, string>(parameters);
var dem = sortedParams.GetEnumerator();
// 第二步：把所有参数名和参数值串在一起
var query = new StringBuilder("");
while (dem.MoveNext())
{
var key = dem.Current.Key;
var value = dem.Current.Value;
if (!string.IsNullOrEmpty(key) && !string.IsNullOrEmpty(value))
query.Append(key).Append("=").Append(value).Append("&");
}
var content = query.ToString().Substring(0, query.Length - 1);
return content;
}
public static string RSASign(IDictionary<string, string> parameters, string privateKeyPem, string charset,
string signType)
{
var signContent = GetSignContent(parameters);
return RSASignCharSet(signContent, privateKeyPem, charset, signType);
}
public static string RSASign(string data, string privateKeyPem, string charset, string signType)
{
return RSASignCharSet(data, privateKeyPem, charset, signType);
}
///*
public static string RSASign(IDictionary<string, string> parameters, string privateKeyPem, string charset,
bool keyFromFile, string signType)
{
var signContent = GetSignContent(parameters);
return RSASignCharSet(signContent, privateKeyPem, charset, keyFromFile, signType);
}
public static string RSASign(string data, string privateKeyPem, string charset, string signType, bool keyFromFile)
{
return RSASignCharSet(data, privateKeyPem, charset, keyFromFile, signType);
}
//*/
public static string RSASignCharSet(string data, string privateKeyPem, string charset, string signType)
{
RSA rsaCsp = LoadCertificateFile(privateKeyPem, signType);
byte[] dataBytes = null;
if (string.IsNullOrEmpty(charset))
dataBytes = Encoding.UTF8.GetBytes(data);
else
dataBytes = Encoding.GetEncoding(charset).GetBytes(data);
var signatureBytes = rsaCsp.SignData(dataBytes, "RSA2".Equals(signType) ? HashAlgorithmName.SHA256 : HashAlgorithmName.SHA1, RSASignaturePadding.Pkcs1);
return Convert.ToBase64String(signatureBytes);
}
public static string RSASignCharSet(string data, string privateKeyPem, string charset, bool keyFromFile,
string signType)
{
byte[] signatureBytes = null;
try
{
RSA rsaCsp = null;
rsaCsp = keyFromFile ? LoadCertificateFile(privateKeyPem, signType) : LoadCertificateString(privateKeyPem, signType);
byte[] dataBytes = null;
if (string.IsNullOrEmpty(charset))
dataBytes = Encoding.UTF8.GetBytes(data);
else
dataBytes = Encoding.GetEncoding(charset).GetBytes(data);
if (null == rsaCsp)
throw new AopException("您使用的私钥格式错误，请检查RSA私钥配置" + ",charset = " + charset);
signatureBytes = rsaCsp.SignData(dataBytes, "RSA2".Equals(signType) ? HashAlgorithmName.SHA256 : HashAlgorithmName.SHA1, RSASignaturePadding.Pkcs1);
}
catch (Exception ex)
{
throw new AopException($"您使用的私钥格式错误，请检查RSA私钥配置,charset = {charset},异常信息:{ex.Message}", ex);
}
return Convert.ToBase64String(signatureBytes);
}
public static bool RSACheckV1(IDictionary<string, string> parameters, string publicKeyPem, string charset)
{
var sign = parameters["sign"];
parameters.Remove("sign");
parameters.Remove("sign_type");
var signContent = GetSignContent(parameters);
return RSACheckContent(signContent, sign, publicKeyPem, charset, "RSA");
}
public static bool RSACheckV1(IDictionary<string, string> parameters, string publicKeyPem)
{
var sign = parameters["sign"];
parameters.Remove("sign");
parameters.Remove("sign_type");
var signContent = GetSignContent(parameters);
return RSACheckContent(signContent, sign, publicKeyPem, DEFAULT_CHARSET, "RSA");
}
public static bool RSA2Check(IDictionary<string, string> parameters, string publicKeyPem)
{
var sign = parameters["sign"];
parameters.Remove("sign");
parameters.Remove("sign_type");
var signContent = GetSignContent(parameters);
return RSACheckContent(signContent, sign, publicKeyPem, DEFAULT_CHARSET, "RSA2");
}
public static bool RSACheckV1(IDictionary<string, string> parameters, string publicKeyPem, string charset,
string signType, bool keyFromFile)
{
var sign = parameters["sign"];
parameters.Remove("sign");
parameters.Remove("sign_type");
var signContent = GetSignContent(parameters);
return RSACheckContent(signContent, sign, publicKeyPem, charset, signType, keyFromFile);
}
public static bool RSACheckV2(IDictionary<string, string> parameters, string publicKeyPem, string charset)
{
var sign = parameters["sign"];
parameters.Remove("sign");
parameters.Remove("sign_type");
var signContent = GetSignContent(parameters);
return RSACheckContent(signContent, sign, publicKeyPem, charset, "RSA");
}
public static bool RSACheckV2(IDictionary<string, string> parameters, string publicKeyPem, string charset,
string signType, bool keyFromFile)
{
var sign = parameters["sign"];
parameters.Remove("sign");
parameters.Remove("sign_type");
var signContent = GetSignContent(parameters);
return RSACheckContent(signContent, sign, publicKeyPem, charset, signType, keyFromFile);
}
public static RSA CreateRsaProviderFromPublicKey(string publicKeyString,string signType)
{
// encoded OID sequence for PKCS #1 rsaEncryption szOID_RSA_RSA = "1.2.840.113549.1.1.1"
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);
// --------- Set up stream to read the asn.1 encoded SubjectPublicKeyInfo blob ------
using (MemoryStream mem = new MemoryStream(x509Key))
{
using (BinaryReader binr = new BinaryReader(mem)) //wrap Memory Stream with BinaryReader for easy reading
{
byte bt = 0;
ushort twobytes = 0;
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;
seq = binr.ReadBytes(15); //read the Sequence OID
if (!CompareBytearrays(seq, seqOid)) //make sure Sequence for OID is correct
return null;
twobytes = binr.ReadUInt16();
if (twobytes == 0x8103) //data read as little endian order (actual data order for Bit String is 03 81)
binr.ReadByte(); //advance 1 byte
else if (twobytes == 0x8203)
binr.ReadInt16(); //advance 2 bytes
else
return null;
bt = binr.ReadByte();
if (bt != 0x00) //expect null byte next
return null;
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();
byte lowbyte = 0x00;
byte highbyte = 0x00;
if (twobytes == 0x8102) //data read as little endian order (actual data order for Integer is 02 81)
lowbyte = binr.ReadByte(); // read next bytes which is bytes in modulus
else if (twobytes == 0x8202)
{
highbyte = binr.ReadByte(); //advance 2 bytes
lowbyte = binr.ReadByte();
}
else
return null;
byte[] modint = { lowbyte, highbyte, 0x00, 0x00 }; //reverse byte order since asn.1 key uses big endian order
int modsize = BitConverter.ToInt32(modint, 0);
int firstbyte = binr.PeekChar();
if (firstbyte == 0x00)
{ //if first byte (highest order) of modulus is zero, don't include it
binr.ReadByte(); //skip this null byte
modsize -= 1; //reduce modulus buffer size by 1
}
byte[] modulus = binr.ReadBytes(modsize); //read the modulus bytes
if (binr.ReadByte() != 0x02) //expect an Integer for the exponent data
return null;
int expbytes = (int)binr.ReadByte(); // should only need one byte for actual exponent data (for all useful values)
byte[] exponent = binr.ReadBytes(expbytes);
// ------- create RSACryptoServiceProvider instance and initialize with public key -----
var rsa = RSA.Create();
rsa.KeySize = signType == "RSA" ? 1024 : 2048;
RSAParameters rsaKeyInfo = new RSAParameters();
rsaKeyInfo.Modulus = modulus;
rsaKeyInfo.Exponent = exponent;
rsa.ImportParameters(rsaKeyInfo);
return rsa;
}
}
}
private static 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 static bool RSACheckContent(string signContent, string sign, string publicKeyPem, string charset,
string signType)
{
try
{
if (string.IsNullOrEmpty(charset))
charset = DEFAULT_CHARSET;
var sPublicKeyPem = File.ReadAllText(publicKeyPem);
var rsa = CreateRsaProviderFromPublicKey(sPublicKeyPem, signType);
if ("RSA2".Equals(signType))
{
var bVerifyResultOriginal = rsa.VerifyData(Encoding.GetEncoding(charset).GetBytes(signContent),
Convert.FromBase64String(sign),HashAlgorithmName.SHA256, RSASignaturePadding.Pkcs1);
return bVerifyResultOriginal;
}
else
{
var bVerifyResultOriginal = rsa.VerifyData(Encoding.GetEncoding(charset).GetBytes(signContent),
Convert.FromBase64String(sign), HashAlgorithmName.SHA1, RSASignaturePadding.Pkcs1);
return bVerifyResultOriginal;
}
}
catch
{
return false;
}
}
public static bool RSACheckContent(string signContent, string sign, string publicKeyPem, string charset,
string signType, bool keyFromFile)
{
try
{
if (string.IsNullOrEmpty(charset))
charset = DEFAULT_CHARSET;
string sPublicKeyPem= publicKeyPem;
if (keyFromFile)
{
sPublicKeyPem = File.ReadAllText(publicKeyPem);
}
var rsa = CreateRsaProviderFromPublicKey(sPublicKeyPem, signType);
if ("RSA2".Equals(signType))
{
var bVerifyResultOriginal = rsa.VerifyData(Encoding.GetEncoding(charset).GetBytes(signContent),
Convert.FromBase64String(sign), HashAlgorithmName.SHA256, RSASignaturePadding.Pkcs1);
return bVerifyResultOriginal;
}
else
{
var bVerifyResultOriginal = rsa.VerifyData(Encoding.GetEncoding(charset).GetBytes(signContent),
Convert.FromBase64String(sign), HashAlgorithmName.SHA1, RSASignaturePadding.Pkcs1);
return bVerifyResultOriginal;
}
}
catch
{
return false;
}
}
public static bool RSACheckContent(string signContent, string sign, string publicKeyPem, string charset,
bool keyFromFile)
{
try
{
string sPublicKeyPem= publicKeyPem;
if (keyFromFile)
{
sPublicKeyPem = File.ReadAllText(publicKeyPem);
}
var rsa = CreateRsaProviderFromPublicKey(sPublicKeyPem, "RSA");
var sha1 = new SHA1CryptoServiceProvider();
if (string.IsNullOrEmpty(charset))
charset = DEFAULT_CHARSET;
var bVerifyResultOriginal = rsa.VerifyData(Encoding.GetEncoding(charset).GetBytes(signContent),
Convert.FromBase64String(sign),HashAlgorithmName.SHA1,RSASignaturePadding.Pkcs1);
return bVerifyResultOriginal;
}
catch (Exception ex)
{
var s = ex.Message;
return false;
}
}
public static string CheckSignAndDecrypt(IDictionary<string, string> parameters, string alipayPublicKey,
string cusPrivateKey, bool isCheckSign,
bool isDecrypt)
{
var charset = parameters["charset"];
var bizContent = parameters["biz_content"];
if (isCheckSign)
if (!RSACheckV2(parameters, alipayPublicKey, charset))
throw new AopException("rsaCheck failure:rsaParams=" + parameters);
if (isDecrypt)
return RSADecrypt(bizContent, cusPrivateKey, charset, "RSA");
return bizContent;
}
public static string CheckSignAndDecrypt(IDictionary<string, string> parameters, string alipayPublicKey,
string cusPrivateKey, bool isCheckSign,
bool isDecrypt, string signType, bool keyFromFile)
{
var charset = parameters["charset"];
var bizContent = parameters["biz_content"];
if (isCheckSign)
if (!RSACheckV2(parameters, alipayPublicKey, charset, signType, keyFromFile))
throw new AopException("rsaCheck failure:rsaParams=" + parameters);
if (isDecrypt)
return RSADecrypt(bizContent, cusPrivateKey, charset, signType, keyFromFile);
return bizContent;
}
public static string encryptAndSign(string bizContent, string alipayPublicKey,
string cusPrivateKey, string charset, bool isEncrypt,
bool isSign, string signType, bool keyFromFile)
{
var sb = new StringBuilder();
if (string.IsNullOrEmpty(charset))
charset = DEFAULT_CHARSET;
sb.Append("<?xml version=\"1.0\" encoding=\"" + charset + "\"?>");
if (isEncrypt)
{
// 加密
sb.Append("<alipay>");
var encrypted = RSAEncrypt(bizContent, alipayPublicKey, charset, keyFromFile);
sb.Append("<response>" + encrypted + "</response>");
sb.Append("<encryption_type>" + signType + "</encryption_type>");
if (isSign)
{
var sign = RSASign(encrypted, cusPrivateKey, charset, signType, keyFromFile);
sb.Append("<sign>" + sign + "</sign>");
sb.Append("<sign_type>" + signType + "</sign_type>");
}
sb.Append("</alipay>");
}
else if (isSign)
{
// 不加密，但需要签名
sb.Append("<alipay>");
sb.Append("<response>" + bizContent + "</response>");
var sign = RSASign(bizContent, cusPrivateKey, charset, signType, keyFromFile);
sb.Append("<sign>" + sign + "</sign>");
sb.Append("<sign_type>" + signType + "</sign_type>");
sb.Append("</alipay>");
}
else
{
// 不加密，不加签
sb.Append(bizContent);
}
return sb.ToString();
}
public static string encryptAndSign(string bizContent, string alipayPublicKey,
string cusPrivateKey, string charset, bool isEncrypt,
bool isSign)
{
var sb = new StringBuilder();
if (string.IsNullOrEmpty(charset))
charset = DEFAULT_CHARSET;
sb.Append("<?xml version=\"1.0\" encoding=\"" + charset + "\"?>");
if (isEncrypt)
{
// 加密
sb.Append("<alipay>");
var encrypted = RSAEncrypt(bizContent, alipayPublicKey, charset);
sb.Append("<response>" + encrypted + "</response>");
sb.Append("<encryption_type>RSA</encryption_type>");
if (isSign)
{
var sign = RSASign(encrypted, cusPrivateKey, charset, "RSA");
sb.Append("<sign>" + sign + "</sign>");
sb.Append("<sign_type>RSA</sign_type>");
}
sb.Append("</alipay>");
}
else if (isSign)
{
// 不加密，但需要签名
sb.Append("<alipay>");
sb.Append("<response>" + bizContent + "</response>");
var sign = RSASign(bizContent, cusPrivateKey, charset, "RSA");
sb.Append("<sign>" + sign + "</sign>");
sb.Append("<sign_type>RSA</sign_type>");
sb.Append("</alipay>");
}
else
{
// 不加密，不加签
sb.Append(bizContent);
}
return sb.ToString();
}
public static string RSAEncrypt(string content, string publicKeyPem, string charset)
{
try
{
var sPublicKeyPEM = File.ReadAllText(publicKeyPem);
var rsa = CreateRsaProviderFromPublicKey(sPublicKeyPEM, "RSA");
if (string.IsNullOrEmpty(charset))
charset = DEFAULT_CHARSET;
var data = Encoding.GetEncoding(charset).GetBytes(content);
var maxBlockSize = rsa.KeySize / 8 - 11; //加密块最大长度限制
if (data.Length <= maxBlockSize)
{
var cipherbytes = rsa.Encrypt(data, RSAEncryptionPadding.Pkcs1);
return Convert.ToBase64String(cipherbytes);
}
var plaiStream = new MemoryStream(data);
var crypStream = new MemoryStream();
var buffer = new byte[maxBlockSize];
var blockSize = plaiStream.Read(buffer, 0, maxBlockSize);
while (blockSize > 0)
{
var toEncrypt = new byte[blockSize];
Array.Copy(buffer, 0, toEncrypt, 0, blockSize);
var cryptograph = rsa.Encrypt(toEncrypt, RSAEncryptionPadding.Pkcs1);
crypStream.Write(cryptograph, 0, cryptograph.Length);
blockSize = plaiStream.Read(buffer, 0, maxBlockSize);
}
return Convert.ToBase64String(crypStream.ToArray(), Base64FormattingOptions.None);
}
catch (Exception ex)
{
throw new AopException("EncryptContent = " + content + ",charset = " + charset, ex);
}
}
public static string RSAEncrypt(string content, string publicKeyPem, string charset, bool keyFromFile)
{
try
{
string sPublicKeyPEM= publicKeyPem;
if (keyFromFile)
{
sPublicKeyPEM = File.ReadAllText(publicKeyPem);
}
var rsa = CreateRsaProviderFromPublicKey(publicKeyPem, "RSA");
if (string.IsNullOrEmpty(charset))
charset = DEFAULT_CHARSET;
var data = Encoding.GetEncoding(charset).GetBytes(content);
var maxBlockSize = rsa.KeySize / 8 - 11; //加密块最大长度限制
if (data.Length <= maxBlockSize)
{
var cipherbytes = rsa.Encrypt(data, RSAEncryptionPadding.Pkcs1);
return Convert.ToBase64String(cipherbytes);
}
var plaiStream = new MemoryStream(data);
var crypStream = new MemoryStream();
var buffer = new byte[maxBlockSize];
var blockSize = plaiStream.Read(buffer, 0, maxBlockSize);
while (blockSize > 0)
{
var toEncrypt = new byte[blockSize];
Array.Copy(buffer, 0, toEncrypt, 0, blockSize);
var cryptograph = rsa.Encrypt(toEncrypt, RSAEncryptionPadding.Pkcs1);
crypStream.Write(cryptograph, 0, cryptograph.Length);
blockSize = plaiStream.Read(buffer, 0, maxBlockSize);
}
return Convert.ToBase64String(crypStream.ToArray(), Base64FormattingOptions.None);
}
catch (Exception ex)
{
throw new AopException("EncryptContent = " + content + ",charset = " + charset, ex);
}
}
public static string RSADecrypt(string content, string privateKeyPem, string charset, string signType)
{
try
{
var rsaCsp = LoadCertificateFile(privateKeyPem, signType);
if (string.IsNullOrEmpty(charset))
charset = DEFAULT_CHARSET;
var data = Convert.FromBase64String(content);
var maxBlockSize = rsaCsp.KeySize / 8; //解密块最大长度限制
if (data.Length <= maxBlockSize)
{
var cipherbytes = rsaCsp.Decrypt(data, RSAEncryptionPadding.Pkcs1);
return Encoding.GetEncoding(charset).GetString(cipherbytes);
}
var crypStream = new MemoryStream(data);
var plaiStream = new MemoryStream();
var buffer = new byte[maxBlockSize];
var blockSize = crypStream.Read(buffer, 0, maxBlockSize);
while (blockSize > 0)
{
var toDecrypt = new byte[blockSize];
Array.Copy(buffer, 0, toDecrypt, 0, blockSize);
var cryptograph = rsaCsp.Decrypt(toDecrypt, RSAEncryptionPadding.Pkcs1);
plaiStream.Write(cryptograph, 0, cryptograph.Length);
blockSize = crypStream.Read(buffer, 0, maxBlockSize);
}
return Encoding.GetEncoding(charset).GetString(plaiStream.ToArray());
}
catch (Exception ex)
{
throw new AopException("DecryptContent = " + content + ",charset = " + charset, ex);
}
}
public static string RSADecrypt(string content, string privateKeyPem, string charset, string signType,
bool keyFromFile)
{
try
{
RSA rsaCsp = null;
if (keyFromFile)
rsaCsp = LoadCertificateFile(privateKeyPem, signType);
else
rsaCsp = LoadCertificateString(privateKeyPem, signType);
if (string.IsNullOrEmpty(charset))
charset = DEFAULT_CHARSET;
var data = Convert.FromBase64String(content);
var maxBlockSize = rsaCsp.KeySize / 8; //解密块最大长度限制
if (data.Length <= maxBlockSize)
{
var cipherbytes = rsaCsp.Decrypt(data, RSAEncryptionPadding.Pkcs1);
return Encoding.GetEncoding(charset).GetString(cipherbytes);
}
var crypStream = new MemoryStream(data);
var plaiStream = new MemoryStream();
var buffer = new byte[maxBlockSize];
var blockSize = crypStream.Read(buffer, 0, maxBlockSize);
while (blockSize > 0)
{
var toDecrypt = new byte[blockSize];
Array.Copy(buffer, 0, toDecrypt, 0, blockSize);
var cryptograph = rsaCsp.Decrypt(toDecrypt, RSAEncryptionPadding.Pkcs1);
plaiStream.Write(cryptograph, 0, cryptograph.Length);
blockSize = crypStream.Read(buffer, 0, maxBlockSize);
}
return Encoding.GetEncoding(charset).GetString(plaiStream.ToArray());
}
catch (Exception ex)
{
throw new AopException("DecryptContent = " + content + ",charset = " + charset, ex);
}
}
private static byte[] GetPem(string type, byte[] data)
{
var pem = Encoding.UTF8.GetString(data);
var header = string.Format("-----BEGIN {0}-----\\n", type);
var footer = string.Format("-----END {0}-----", type);
var start = pem.IndexOf(header) + header.Length;
var end = pem.IndexOf(footer, start);
var base64 = pem.Substring(start, end - start);
return Convert.FromBase64String(base64);
}
private static RSA LoadCertificateFile(string filename, string signType)
{
using (var fs = File.OpenRead(filename))
{
var data = new byte[fs.Length];
byte[] res = null;
fs.Read(data, 0, data.Length);
if (data[0] != 0x30)
res = GetPem("RSA PRIVATE KEY", data);
try
{
var rsa = DecodeRSAPrivateKey(res, signType);
return rsa;
}
catch (Exception ex)
{
}
return null;
}
}
public static RSA LoadCertificateString(string strKey, string signType)
{
byte[] data = null;
//读取带
//ata = Encoding.Default.GetBytes(strKey);
data = Convert.FromBase64String(strKey);
//data = GetPem("RSA PRIVATE KEY", data);
try
{
var rsa = DecodeRSAPrivateKey(data, signType);
return rsa;
}
catch (Exception ex)
{
throw new AopException("Alipay.AopSdk.Core.Util.AlipaySignature LoadCertificateString DecodeRSAPrivateKey Error", ex);
}
return null;
}
private static RSA DecodeRSAPrivateKey(byte[] privkey, string signType)
{
byte[] MODULUS, E, D, P, Q, DP, DQ, IQ;
// --------- Set up stream to decode the asn.1 encoded RSA private key ------
var mem = new MemoryStream(privkey);
var binr = new BinaryReader(mem); //wrap Memory Stream with BinaryReader for easy reading
byte bt = 0;
ushort twobytes = 0;
var 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 -----
var CspParameters = new CspParameters();
CspParameters.Flags = CspProviderFlags.UseMachineKeyStore;
var bitLen = 1024;
if ("RSA2".Equals(signType))
bitLen = 2048;
var rsa = RSA.Create();
rsa.KeySize = bitLen;
var 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 (Exception ex)
{
return null;
}
finally
{
binr.Close();
}
}
private static int GetIntegerSize(BinaryReader binr)
{
byte bt = 0;
byte lowbyte = 0x00;
byte highbyte = 0x00;
var 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;
}
}
}
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