RSA加解密工具类

Java 实现

import java.security.KeyFactory;

import java.security.KeyPair;

import java.security.KeyPairGenerator;

import java.security.NoSuchAlgorithmException;

import java.security.SecureRandom;

import java.security.interfaces.RSAPrivateKey;

import java.security.interfaces.RSAPublicKey;

import java.security.spec.PKCS8EncodedKeySpec;

import java.security.spec.X509EncodedKeySpec;

import java.util.HashMap;

import java.util.Map;

import javax.crypto.Cipher;

import org.apache.commons.codec.binary.Base64;

/**

* RSA 加解密工具类

*

* @author ZT ** 秘钥对可以在在线生成网站获取(http://web./netrsakeypair)

* 在线生成非对称加密公钥私钥对、在线生成公私钥对、RSA Key pair create、生成RSA密钥对 选择秘钥位数：1024

* 秘钥格式：PKCS#8

*

*/

public class RSACryptUtil {

/**

* 获取公钥

*

* @return

*/

public static String getPubliceKey() {

// rsa_public_key.pem内容

String publickey = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDLK6Hw RE///HKM1zukQTao/ybdm7RpbQ2bvDTHtDWysx46vIC4wosNZwP3bmxEpzq8f6B3jZeqtcoxCWfVNi1S1FNjyKpC55xmjzrCTNUe9mSgKwyoGU/kHpR4FyXTgP02XkuDXXJrODlDQQg0UNrgbkA9BboLxdxkZLsp1tshQIDAQAB";

publickey = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCssD8md1gI0kA6TVOQtggtvBrSH N/q5/ grs7LSXT2P7UzVeuN1SdETZdt 386D/3K/k8aJmQILc0HoEjHUIopbdEP318odCnmytveenZCdCtq8/9n1HUcmAUDEVS03F6z51DUvjMfKKSqdc66vhagVciamOmFQNdZJu3jZXjlQIDAQAB";

return publickey;

}

/**

* 获取私钥

*

* @return

*/

public static String getPrivateKey() {

String privatekey = "MIICdwIBADANBgkqhkiG9w0BAQEFAASCAmEwggJdAgEAAoGBAMsrofD5ET//8cozXO6RBNqj/Jt2btGltDZu8NMe0NbKzHjq8gLjCiw1nA/dubESnOrx/oHeNl6q1yjEJZ9U2LVLUU2PIqkLnnGaPOsJM1R72ZKArDKgZT QelHgXJdOA/TZeS4Ndcms4OUNBCDRQ2uBuQD0FugvF3GRkuynW2yFAgMBAAECgYEAwlEMBOaiqfyIbCTt Dp5UwhOvP3sBdWfZAR9jt7FTPoP0IKdT0eI3jmz9rTROlub 1XSXrGCfM6XFKVtelNzI1PqEB QomBhZtwhzSmxrFWCg4q2oeZsqROKlDBDhV8pFhGX9Euo4HxsNJWLcA4Ngt6ZIwV/Drj7uOEA06UxFyECQQD76Fl4rKPOdzC0RBtRZEqxmC32nikwAWz2FqinNzee tiMeF2OydP1bCTp3R/mo6Li7hqUcV3LjFCf4nFB8K5ZAkEAzniXc7ppAL286XtKlIOVQnxlhL wDGtbHZ SppD02OBFoDGPOivYz8yKL7ktgFwfGzRhGKjJXuXgHwmCnvjiDQJAFhgG4OKja1Rg3S6sBrN5KaJjRaIRkrhNSjgqip/5LORrYcaczg09neTiR/Cw/5WSj7y6cBKRW2zvFVbTACmP4QJATgVZzdyKI0KPqXbyhs52T6psPk6lOvwycS5En3a1X2LYTKGNqwC4rEVxjnkeTZwCESio7EWT2q1pFLFmT6Zi3QJBAKwE1Q3l20UikKhDNrAhxv1R3GgLf8d Oz5nsQL1yL/blwn3/Bm5Zr S1XYH5Sz7TBitilmFuO2Wy3xI26EQcQ=";

privatekey = "MIICdwIBADANBgkqhkiG9w0BAQEFAASCAmEwggJdAgEAAoGBAKywPyZ3WAjSQDpNU5C2CC28GtIf43 rn/6CuzstJdPY/tTNV643VJ0RNl237fzoP/cr TxomZAgtzQegSMdQiilt0Q/fXyh0KebK2956dkJ0K2rz/2fUdRyYBQMRVLTcXrPnUNS Mx8opKp1zrq FqBVyJqY6YVA11km7eNleOVAgMBAAECgYEAnDr7dvaDu79TgiuRDZvR/GZwsWdOL6P6pIxrjVcEIQvxSF7aE3BVaaA32kPb2HHZ5Olwm/lZ7K3ccRej5zvCLH19nFQNX4VLHtmxKhVSOB20r6pC6YnmmCIBNAd4fKdDYG0b7qc8wC2 rdWAnJ0Xe8Dk9heaY MdS188L3u7sqECQQDVIpDdyLeKoI58NFjPiDZeCzJaEl8Vd5K93qTA zpCoOlqqDFrPgwMqLczCVJhmtAriHRXaC2vw1TCsrxPSOSNAkEAz2tBieV FVU0JoaAYcy88/xPeBaBCnVohdjjrKjhsXpXO6cbQsmr/bNMqPykemiTuXpixXBaL9FmRshrK86tKQJAGuRSnPkvV1lswPUl44GPQoxtHPpGbwH4TOajqQnJzxBYgzGXkq1wfcRn4ROjBlevPl7oNwMZCJ0/u5Urt2E HQJBAJ8cFrVSPyrcJlobOSZMqPG8rbVgBfLg56ItI1FSZ3b cyZGZOoRzAacYQUMcJuZ1yAj2tq7 eLOjddkbJm5PCkCQC9rqJpYYt ZUoPb4MfQPMRlhsNVIsCflNjYYJMbtP8aISjxkBXzI1f 9EbC/AzXcbc7Xhhad3vq2VA4Gnvmy8w=";

return privatekey;

}

private static MapkeyMap = new HashMap(); // 用于封装随机产生的公钥与私钥

public static void main(String[] args) throws Exception {

// 生成公钥和私钥

genKeyPair();

// 加密字符串

String message = "aaabbbb";

System.out.println("随机生成的公钥为:" keyMap.get(0));

System.out.println("随机生成的私钥为:" keyMap.get(1));

String messageEn = encrypt(message, keyMap.get(0));

System.out.println(message "\t加密后的字符串为:" messageEn);

String messageDe = decrypt(messageEn, keyMap.get(1));

System.out.println("还原后的字符串为:" messageDe);

}

/**

* 随机生成密钥对

*

* @throws NoSuchAlgorithmException

*/

public static void genKeyPair() throws NoSuchAlgorithmException {

// KeyPairGenerator类用于生成公钥和私钥对，基于RSA算法生成对象

KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA");

// 初始化密钥对生成器，密钥大小为96-1024位

keyPairGen.initialize(1024, new SecureRandom());

// 生成一个密钥对，保存在keyPair中

KeyPair keyPair = keyPairGen.generateKeyPair();

RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate(); // 得到私钥

RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic(); // 得到公钥

String publicKeyString = new String(Base64.encodeBase64(publicKey.getEncoded()));

// 得到私钥字符串

String privateKeyString = new String(Base64.encodeBase64((privateKey.getEncoded())));

// 将公钥和私钥保存到Map

keyMap.put(0, publicKeyString); // 0表示公钥

keyMap.put(1, privateKeyString); // 1表示私钥

}

/**

* RSA公钥加密

*

* @param str 加密字符串

* @param publicKey 公钥

* @return 密文

* @throws Exception 加密过程中的异常信息

*/

public static String encrypt(String str, String publicKey) throws Exception {

// base64编码的公钥

byte[] decoded = Base64.decodeBase64(publicKey);

RSAPublicKey pubKey = (RSAPublicKey) KeyFactory.getInstance("RSA")

.generatePublic(new X509EncodedKeySpec(decoded));

// RSA加密

Cipher cipher = Cipher.getInstance("RSA");

cipher.init(Cipher.ENCRYPT_MODE, pubKey);

String outStr = Base64.encodeBase64String(cipher.doFinal(str.getBytes("UTF-8")));

return outStr;

}

/**

* RSA私钥解密

* @param str 加密字符串

* @param privateKey 私钥

* @return 铭文

* @throws Exception 解密过程中的异常信息

*/

public static String decrypt(String str, String privateKey) throws Exception {

// 64位解码加密后的字符串

byte[] inputByte = Base64.decodeBase64(str.getBytes("UTF-8"));

// base64编码的私钥

byte[] decoded = Base64.decodeBase64(privateKey);

RSAPrivateKey priKey = (RSAPrivateKey) KeyFactory.getInstance("RSA")

.generatePrivate(new PKCS8EncodedKeySpec(decoded));

// RSA解密

Cipher cipher = Cipher.getInstance("RSA");

cipher.init(Cipher.DECRYPT_MODE, priKey);

String outStr = new String(cipher.doFinal(inputByte));

return outStr;

}

}

C# 实现

using System;

using System.Collections.Generic;

using System.IO;

using System.Linq;

using System.Security.Cryptography;

using System.Text;

using System.Web;

namespace BS.Data

{

///

/// 类名：RSACrypt

/// 功能：RSA加密、解密、签名、验签

///

public class RSACrypt

{

/***

* 秘钥对可以在在线生成网站获取(http://web./netrsakeypair)

* 在线生成非对称加密公钥私钥对、在线生成公私钥对、RSA Key pair create、生成RSA密钥对

* 选择秘钥位数：1024

* 秘钥格式：PKCS#8

*/

///

/// 获取公钥

///

///

public static string getPubliceKey()

{

//rsa_public_key.pem内容

string publickey = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDLK6Hw RE///HKM1zukQTao/ybdm7RpbQ2bvDTHtDWysx46vIC4wosNZwP3bmxEpzq8f6B3jZeqtcoxCWfVNi1S1FNjyKpC55xmjzrCTNUe9mSgKwyoGU/kHpR4FyXTgP02XkuDXXJrODlDQQg0UNrgbkA9BboLxdxkZLsp1tshQIDAQAB";

publickey = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCssD8md1gI0kA6TVOQtggtvBrSH N/q5/ grs7LSXT2P7UzVeuN1SdETZdt 386D/3K/k8aJmQILc0HoEjHUIopbdEP318odCnmytveenZCdCtq8/9n1HUcmAUDEVS03F6z51DUvjMfKKSqdc66vhagVciamOmFQNdZJu3jZXjlQIDAQAB";

return publickey;

}

///

/// 获取私钥

///

///

public static string getPrivateKey()

{

string privatekey = "MIICdwIBADANBgkqhkiG9w0BAQEFAASCAmEwggJdAgEAAoGBAMsrofD5ET//8cozXO6RBNqj/Jt2btGltDZu8NMe0NbKzHjq8gLjCiw1nA/dubESnOrx/oHeNl6q1yjEJZ9U2LVLUU2PIqkLnnGaPOsJM1R72ZKArDKgZT QelHgXJdOA/TZeS4Ndcms4OUNBCDRQ2uBuQD0FugvF3GRkuynW2yFAgMBAAECgYEAwlEMBOaiqfyIbCTt Dp5UwhOvP3sBdWfZAR9jt7FTPoP0IKdT0eI3jmz9rTROlub 1XSXrGCfM6XFKVtelNzI1PqEB QomBhZtwhzSmxrFWCg4q2oeZsqROKlDBDhV8pFhGX9Euo4HxsNJWLcA4Ngt6ZIwV/Drj7uOEA06UxFyECQQD76Fl4rKPOdzC0RBtRZEqxmC32nikwAWz2FqinNzee tiMeF2OydP1bCTp3R/mo6Li7hqUcV3LjFCf4nFB8K5ZAkEAzniXc7ppAL286XtKlIOVQnxlhL wDGtbHZ SppD02OBFoDGPOivYz8yKL7ktgFwfGzRhGKjJXuXgHwmCnvjiDQJAFhgG4OKja1Rg3S6sBrN5KaJjRaIRkrhNSjgqip/5LORrYcaczg09neTiR/Cw/5WSj7y6cBKRW2zvFVbTACmP4QJATgVZzdyKI0KPqXbyhs52T6psPk6lOvwycS5En3a1X2LYTKGNqwC4rEVxjnkeTZwCESio7EWT2q1pFLFmT6Zi3QJBAKwE1Q3l20UikKhDNrAhxv1R3GgLf8d Oz5nsQL1yL/blwn3/Bm5Zr S1XYH5Sz7TBitilmFuO2Wy3xI26EQcQ=";

privatekey = "MIICdwIBADANBgkqhkiG9w0BAQEFAASCAmEwggJdAgEAAoGBAKywPyZ3WAjSQDpNU5C2CC28GtIf43 rn/6CuzstJdPY/tTNV643VJ0RNl237fzoP/cr TxomZAgtzQegSMdQiilt0Q/fXyh0KebK2956dkJ0K2rz/2fUdRyYBQMRVLTcXrPnUNS Mx8opKp1zrq FqBVyJqY6YVA11km7eNleOVAgMBAAECgYEAnDr7dvaDu79TgiuRDZvR/GZwsWdOL6P6pIxrjVcEIQvxSF7aE3BVaaA32kPb2HHZ5Olwm/lZ7K3ccRej5zvCLH19nFQNX4VLHtmxKhVSOB20r6pC6YnmmCIBNAd4fKdDYG0b7qc8wC2 rdWAnJ0Xe8Dk9heaY MdS188L3u7sqECQQDVIpDdyLeKoI58NFjPiDZeCzJaEl8Vd5K93qTA zpCoOlqqDFrPgwMqLczCVJhmtAriHRXaC2vw1TCsrxPSOSNAkEAz2tBieV FVU0JoaAYcy88/xPeBaBCnVohdjjrKjhsXpXO6cbQsmr/bNMqPykemiTuXpixXBaL9FmRshrK86tKQJAGuRSnPkvV1lswPUl44GPQoxtHPpGbwH4TOajqQnJzxBYgzGXkq1wfcRn4ROjBlevPl7oNwMZCJ0/u5Urt2E HQJBAJ8cFrVSPyrcJlobOSZMqPG8rbVgBfLg56ItI1FSZ3b cyZGZOoRzAacYQUMcJuZ1yAj2tq7 eLOjddkbJm5PCkCQC9rqJpYYt ZUoPb4MfQPMRlhsNVIsCflNjYYJMbtP8aISjxkBXzI1f 9EbC/AzXcbc7Xhhad3vq2VA4Gnvmy8w=";

return privatekey;

}

///

/// 签名

///

///待签名字符串

///私钥

///编码格式

///签名后字符串

public static string sign(string content, string privateKey, string input_charset)

{

byte[] Data = Encoding.GetEncoding(input_charset).GetBytes(content);

RSACryptoServiceProvider rsa = DecodePemPrivateKey(privateKey);

SHA1 sh = new SHA1CryptoServiceProvider();

byte[] signData = rsa.SignData(Data, sh);

return Convert.ToBase64String(signData);

}

///

/// 验签

///

///待验签字符串

///签名

///公钥

///编码格式

///true(通过)，false(不通过)

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);

SHA1 sh = new SHA1CryptoServiceProvider();

result = rsaPub.VerifyData(Data, sh, data);

return result;

}

///

/// 加密 (注意：同一个数据每次加密生成的结果数据不一样,私钥都可以完成解密)

///

///需要加密的字符串

///公钥

///编码格式

///明文

public static string encryptData(string resData, string publicKey, string input_charset)

{

byte[] DataToEncrypt = Encoding.ASCII.GetBytes(resData);

string result = encrypt(DataToEncrypt, publicKey, input_charset);

return result;

}

///

/// 解密

///

///加密字符串

///私钥

///编码格式

///明文

public static string decryptData(string resData, string privateKey, string input_charset)

{

byte[] DataToDecrypt = Convert.FromBase64String(resData);

string result = "";

for (int j = 0; j < DataToDecrypt.Length / 128; j )

{

byte[] buf = new byte[128];

for (int i = 0; i < 128; i )

{

buf[i] = DataToDecrypt[i 128 * j];

}

result = decrypt(buf, privateKey, input_charset);

}

return result;

}

private static string encrypt(byte[] data, string publicKey, string input_charset)

{

RSACryptoServiceProvider rsa = DecodePemPublicKey(publicKey);

SHA1 sh = new SHA1CryptoServiceProvider();

byte[] result = rsa.Encrypt(data, false);

return Convert.ToBase64String(result);

}

private static string decrypt(byte[] data, string privateKey, string input_charset)

{

string result = "";

RSACryptoServiceProvider rsa = DecodePemPrivateKey(privateKey);

SHA1 sh = new SHA1CryptoServiceProvider();

byte[] source = rsa.Decrypt(data, false);

char[] asciiChars = new char[Encoding.GetEncoding(input_charset).GetCharCount(source, 0, source.Length)];

Encoding.GetEncoding(input_charset).GetChars(source, 0, source.Length, asciiChars, 0);

result = new string(asciiChars);

return result;

}

private static RSACryptoServiceProvider DecodePemPublicKey(String pemstr)

{

byte[] pkcs8publickkey;

pkcs8publickkey = Convert.FromBase64String(pemstr);

if (pkcs8publickkey != null)

{

RSACryptoServiceProvider rsa = DecodeRSAPublicKey(pkcs8publickkey);

return rsa;

}

else

return null;

}

private static RSACryptoServiceProvider DecodePemPrivateKey(String pemstr)

{

byte[] pkcs8privatekey;

pkcs8privatekey = Convert.FromBase64String(pemstr);

if (pkcs8privatekey != null)

{

RSACryptoServiceProvider rsa = DecodePrivateKeyInfo(pkcs8privatekey);

return rsa;

}

else

return null;

}

private static RSACryptoServiceProvider DecodePrivateKeyInfo(byte[] pkcs8)

{

byte[] SeqOID = { 0x30, 0x0D, 0x06, 0x09, 0x2A, 0x86, 0x48, 0x86, 0xF7, 0x0D, 0x01, 0x01, 0x01, 0x05, 0x00 };

byte[] seq = new byte[15];

MemoryStream mem = new MemoryStream(pkcs8);

int lenstream = (int)mem.Length;

BinaryReader binr = new BinaryReader(mem);

byte bt = 0;

ushort twobytes = 0;

try

{

twobytes = binr.ReadUInt16();

if (twobytes == 0x8130)

binr.ReadByte();

else if (twobytes == 0x8230)

binr.ReadInt16();

else

return null;

bt = binr.ReadByte();

if (bt != 0x02)

return null;

twobytes = binr.ReadUInt16();

if (twobytes != 0x0001)

return null;

seq = binr.ReadBytes(15);

if (!CompareBytearrays(seq, SeqOID))

return null;

bt = binr.ReadByte();

if (bt != 0x04)

return null;

bt = binr.ReadByte();

if (bt == 0x81)

binr.ReadByte();

else

if (bt == 0x82)

binr.ReadUInt16();

byte[] rsaprivkey = binr.ReadBytes((int)(lenstream - mem.Position));

RSACryptoServiceProvider rsacsp = DecodeRSAPrivateKey(rsaprivkey);

return rsacsp;

}

catch (Exception)

{

return null;

}

finally { binr.Close(); }

}

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;

}

private static RSACryptoServiceProvider DecodeRSAPublicKey(byte[] publickey)

{

byte[] SeqOID = { 0x30, 0x0D, 0x06, 0x09, 0x2A, 0x86, 0x48, 0x86, 0xF7, 0x0D, 0x01, 0x01, 0x01, 0x05, 0x00 };

byte[] seq = new byte[15];

MemoryStream mem = new MemoryStream(publickey);

BinaryReader binr = new BinaryReader(mem);

byte bt = 0;

ushort twobytes = 0;

try

{

twobytes = binr.ReadUInt16();

if (twobytes == 0x8130)

binr.ReadByte();

else if (twobytes == 0x8230)

binr.ReadInt16();

else

return null;

seq = binr.ReadBytes(15);

if (!CompareBytearrays(seq, SeqOID))

return null;

twobytes = binr.ReadUInt16();

if (twobytes == 0x8103)

binr.ReadByte();

else if (twobytes == 0x8203)

binr.ReadInt16();

else

return null;

bt = binr.ReadByte();

if (bt != 0x00)

return null;

twobytes = binr.ReadUInt16();

if (twobytes == 0x8130)

binr.ReadByte();

else if (twobytes == 0x8230)

binr.ReadInt16();

else

return null;

twobytes = binr.ReadUInt16();

byte lowbyte = 0x00;

byte highbyte = 0x00;

if (twobytes == 0x8102)

lowbyte = binr.ReadByte();

else if (twobytes == 0x8202)

{

highbyte = binr.ReadByte();

lowbyte = binr.ReadByte();

}

else

return null;

byte[] modint = { lowbyte, highbyte, 0x00, 0x00 };

int modsize = BitConverter.ToInt32(modint, 0);

byte firstbyte = binr.ReadByte();

binr.BaseStream.Seek(-1, SeekOrigin.Current);

if (firstbyte == 0x00)

{

binr.ReadByte();

modsize -= 1;

}

byte[] modulus = binr.ReadBytes(modsize);

if (binr.ReadByte() != 0x02)

return null;

int expbytes = (int)binr.ReadByte();

byte[] exponent = binr.ReadBytes(expbytes);

RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();

RSAParameters RSAKeyInfo = new RSAParameters();

RSAKeyInfo.Modulus = modulus;

RSAKeyInfo.Exponent = exponent;

RSA.ImportParameters(RSAKeyInfo);

return RSA;

}

catch (Exception)

{

return null;

}

finally { binr.Close(); }

}

private static RSACryptoServiceProvider DecodeRSAPrivateKey(byte[] privkey)

{

byte[] MODULUS, E, D, P, Q, DP, DQ, IQ;

MemoryStream mem = new MemoryStream(privkey);

BinaryReader binr = new BinaryReader(mem);

byte bt = 0;

ushort twobytes = 0;

int elems = 0;

try

{

twobytes = binr.ReadUInt16();

if (twobytes == 0x8130)

binr.ReadByte();

else if (twobytes == 0x8230)

binr.ReadInt16();

else

return null;

twobytes = binr.ReadUInt16();

if (twobytes != 0x0102)

return null;

bt = binr.ReadByte();

if (bt != 0x00)

return null;

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);

RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();

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 (Exception)

{

return null;

}

finally { binr.Close(); }

}

private static int GetIntegerSize(BinaryReader binr)

{

byte bt = 0;

byte lowbyte = 0x00;

byte highbyte = 0x00;

int count = 0;

bt = binr.ReadByte();

if (bt != 0x02)

return 0;

bt = binr.ReadByte();

if (bt == 0x81)

count = binr.ReadByte();

else

if (bt == 0x82)

{

highbyte = binr.ReadByte();

lowbyte = binr.ReadByte();

byte[] modint = { lowbyte, highbyte, 0x00, 0x00 };

count = BitConverter.ToInt32(modint, 0);

}

else

{

count = bt;

}

while (binr.ReadByte() == 0x00)

{

count -= 1;

}

binr.BaseStream.Seek(-1, SeekOrigin.Current);

return count;

}

private static RSAParameters ConvertFromPublicKey(string pemFileConent)

{

byte[] keyData = Convert.FromBase64String(pemFileConent);

if (keyData.Length < 162)

{

throw new ArgumentException("pem file content is incorrect.");

}

byte[] pemModulus = new byte[128];

byte[] pemPublicExponent = new byte[3];

Array.Copy(keyData, 29, pemModulus, 0, 128);

Array.Copy(keyData, 159, pemPublicExponent, 0, 3);

RSAParameters para = new RSAParameters();

para.Modulus = pemModulus;

para.Exponent = pemPublicExponent;

return para;

}

private static RSAParameters ConvertFromPrivateKey(string pemFileConent)

{

byte[] keyData = Convert.FromBase64String(pemFileConent);

if (keyData.Length < 609)

{

throw new ArgumentException("pem file content is incorrect.");

}

int index = 11;

byte[] pemModulus = new byte[128];

Array.Copy(keyData, index, pemModulus, 0, 128);

index = 128;

index = 2;

byte[] pemPublicExponent = new byte[3];

Array.Copy(keyData, index, pemPublicExponent, 0, 3);

index = 3;

index = 4;

byte[] pemPrivateExponent = new byte[128];

Array.Copy(keyData, index, pemPrivateExponent, 0, 128);

index = 128;

index = ((int)keyData[index 1] == 64 ? 2 : 3);

byte[] pemPrime1 = new byte[64];

Array.Copy(keyData, index, pemPrime1, 0, 64);

index = 64;

index = ((int)keyData[index 1] == 64 ? 2 : 3);//346

byte[] pemPrime2 = new byte[64];

Array.Copy(keyData, index, pemPrime2, 0, 64);

index = 64;

index = ((int)keyData[index 1] == 64 ? 2 : 3);

byte[] pemExponent1 = new byte[64];

Array.Copy(keyData, index, pemExponent1, 0, 64);

index = 64;

index = ((int)keyData[index 1] == 64 ? 2 : 3);

byte[] pemExponent2 = new byte[64];

Array.Copy(keyData, index, pemExponent2, 0, 64);

index = 64;

index = ((int)keyData[index 1] == 64 ? 2 : 3);

byte[] pemCoefficient = new byte[64];

Array.Copy(keyData, index, pemCoefficient, 0, 64);

RSAParameters para = new RSAParameters();

para.Modulus = pemModulus;

para.Exponent = pemPublicExponent;

para.D = pemPrivateExponent;

para.P = pemPrime1;

para.Q = pemPrime2;

para.DP = pemExponent1;

para.DQ = pemExponent2;

para.InverseQ = pemCoefficient;

return para;

}

}

}来源：https://www./content-4-604751.html