java/php/c#版rsa签名以及java验签实现--转

在开放平台领域，需要给isv提供sdk，签名是Sdk中需要提供的功能之一。由于isv使用的开发语言不是单一的，因此sdk需要提供多种语言的版本。譬如java、php、c#。另外，在电子商务尤其是支付领域，对安全性的要求比较高，所以会采用非对称密钥RSA

       本文主要介绍如何基于java、php、c#在客户端使用rsa签名，然后在服务端使用Java验签。

 

1. 基于openssl生成RSA公私钥对

a）从网上下载openssl工具: http://www.slproweb.com/products/Win32OpenSSL.html

  b）生成私钥

进入到openssl的bin目录下，执行以下命令：

openssl genrsa -out rsa_private_key.pem 1024

会在bin目录下看到新生成的私钥文件rsa_private_key.pem，文件内容如下：

-----BEGIN RSA PRIVATE KEY-----

MIICXgIBAAKBgQDtd1lKsX6ylsAEWFi7E/ut8krJy9PQ7sGYKhIm9TvIdZiq5xzy

aw8NOLzKZ1k486MePYG4tSuoaxSbwuPLwVUzYFvnUZo7aWCIGKn16UWTM4nxc/+d

wce+bhcKrlLbTWi8l580LTE7GxclTh8z7gHq59ivhaoGbK7FNxlUfB4TSQIDAQAB

AoGBAIgTk0x1J+hI8KHMypPxoJCOPoMi1S9uEewTd7FxaB+4G5Mbuv/Dj62A7NaD

oKI9IyUqE9L3ppvtOLMFXCofkKU0p4j7MEJdZ+CjVvgextkWa80nj/UZiM1oOL6Y

HwH4ZtPtY+pFCTK1rdn3+070qBB9tnVntbN/jq0Ld7f0t7UNAkEA9ryI0kxJL9Pu

pO9NEeWuCUo4xcl9x/M9+mtkfY3VoDDDV1E/eUjmoTfANYwrjcddiQrO0MLyEdoo

tiLpN77qOwJBAPZhtv/+pqMVTrLxWnVKLZ4ZVTPPgJQQkFdhWwYlz7oKzB3VbQRt

/jLFXUyCN2eCP7rglrXnaz7AYBftF0ajHEsCQQDDNfkeQULqN0gpcDdOwKRIL1Pp

kHgWmWlg1lTETVJGEi6Kx/prL/VgeiZ1dzgCTUjAoy9r1cEFxM/PAqH3+/F/AkEA

zsTCp6Q2hLblDRewKq7OCdiIwKpr5dbgy/RQR6CD7EYTdxYeH5GPu1wXKJY/mQae

JV9GG/LS9h7MhkfbONS6cQJAdBEb5vloBDLcSQFDQO/VZ9SKFHCmHLXluhhIizYK

Gzgf3OXEGNDSAC3qy+ZTnLd3N5iYrVbK52UoiLOLhhNMqA==

-----END RSA PRIVATE KEY-----

  c)生成公钥

在bin目录下，执行以下命令：

openssl rsa -in rsa_private_key.pem -pubout -out rsa_public_key.pem

会在bin目录下看到新生成的公钥文件rsa_public_key.pem，文件内容如下：

-----BEGIN PUBLIC KEY-----

MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDtd1lKsX6ylsAEWFi7E/ut8krJ

y9PQ7sGYKhIm9TvIdZiq5xzyaw8NOLzKZ1k486MePYG4tSuoaxSbwuPLwVUzYFvn

UZo7aWCIGKn16UWTM4nxc/+dwce+bhcKrlLbTWi8l580LTE7GxclTh8z7gHq59iv

haoGbK7FNxlUfB4TSQIDAQAB

-----END PUBLIC KEY-----

 2. 客户端签名

  2.1 java版签名实现

/**

     * rsa签名

     * 

     * @param content

     *            待签名的字符串

     * @param privateKey

     *            rsa私钥字符串

     * @param charset

     *            字符编码

     * @return 签名结果

     * @throws Exception

     *             签名失败则抛出异常

     */

    public String rsaSign(String content, String privateKey, String charset) throws SignatureException {

        try {

            PrivateKey priKey = getPrivateKeyFromPKCS8("RSA", new ByteArrayInputStream(privateKey.getBytes()));



            Signature signature = Signature.getInstance("SHA1WithRSA");

            signature.initSign(priKey);

            if (StringUtils.isEmpty(charset)) {

                signature.update(content.getBytes());

            } else {

                signature.update(content.getBytes(charset));

            }



            byte[] signed = signature.sign();

            return new String(Base64.encodeBase64(signed));

        } catch (Exception e) {

            throw new SignatureException("RSAcontent = " + content + "; charset = " + charset, e);

        }

    }



    public PrivateKey getPrivateKeyFromPKCS8(String algorithm, InputStream ins) throws Exception {

        if (ins == null || StringUtils.isEmpty(algorithm)) {

            return null;

        }



        KeyFactory keyFactory = KeyFactory.getInstance(algorithm);

        byte[] encodedKey = StreamUtil.readText(ins).getBytes();

        encodedKey = Base64.decodeBase64(encodedKey);

        return keyFactory.generatePrivate(new PKCS8EncodedKeySpec(encodedKey));

    }

 注意：参数privateKey是Pem私钥文件中去除头（-----BEGIN RSA PRIVATE KEY-----）和尾（-----END RSA PRIVATE KEY-----）以及换行符后的字符串。

如果签名报以下错误：

java.security.spec.InvalidKeySpecException: java.security.InvalidKeyException: IOException : algid parse error, not a sequence

则说明rsa私钥的格式不是pksc8格式，需要使用以下命令转换一下：

openssl pkcs8 -topk8 -inform PEM -in rsa_private_key.pem -outform PEM -nocrypt

然后再提取去除头和尾以及换行符后字符串作为java版用的rsa私钥。

2.2 php签名实现

function sign($content, $rsaPrivateKeyPem) {

        $priKey = file_get_contents($rsaPrivateKeyPem);

        $res = openssl_get_privatekey($priKey);

        openssl_sign($content, $sign, $res);

        openssl_free_key($res);

        $sign = base64_encode($sign);

        return $sign;

    }

注意：$rsaPrivateKeyPem为pem私钥文件路径

  2.3 c#签名实现(引用了国外某位仁兄的方案)

using System;

using System.Text;

using System.Security.Cryptography;

using System.Web;

using System.IO;



namespace Aop.Api.Util

{

    /// <summary>

    /// RSA签名工具类。

    /// </summary>

    public class RSAUtil

    {



        public static string RSASign(string data, string privateKeyPem)

        {

            RSACryptoServiceProvider rsaCsp = LoadCertificateFile(privateKeyPem);

            byte[] dataBytes = Encoding.UTF8.GetBytes(data);

            byte[] signatureBytes = rsaCsp.SignData(dataBytes, "SHA1");

            return Convert.ToBase64String(signatureBytes);

        }



        private static byte[] GetPem(string type, byte[] data)

        {

            string pem = Encoding.UTF8.GetString(data);

            string header = String.Format("-----BEGIN {0}-----\\n", type);

            string footer = String.Format("-----END {0}-----", type);

            int start = pem.IndexOf(header) + header.Length;

            int end = pem.IndexOf(footer, start);

            string base64 = pem.Substring(start, (end - start));

            return Convert.FromBase64String(base64);

        }



        private static RSACryptoServiceProvider LoadCertificateFile(string filename)

        {

            using (System.IO.FileStream fs = System.IO.File.OpenRead(filename))

            {

                byte[] 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

                {

                    RSACryptoServiceProvider rsa = DecodeRSAPrivateKey(res);

                    return rsa;

                }

                catch (Exception ex)

                {

                }

                return null;

            }

        }



        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 (Exception ex)

            {

                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)        //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;

        }

    }

}

注：privateKeyPem为私钥文件路径

  3. 服务端java验签

/**

     * rsa验签

     * 

     * @param content 被签名的内容

     * @param sign 签名后的结果

     * @param publicKey rsa公钥

     * @param charset 字符集

     * @return 验签结果

     * @throws SignatureException 验签失败，则抛异常

     */

    boolean doCheck(String content, String sign, String publicKey, String charset) throws SignatureException {

        try {

            PublicKey pubKey = getPublicKeyFromX509("RSA", new ByteArrayInputStream(publicKey.getBytes()));



            Signature signature = Signature.getInstance("SHA1WithRSA");

            signature.initVerify(pubKey);

            signature.update(getContentBytes(content, charset));

            return signature.verify(Base64.decodeBase64(sign.getBytes()));

        } catch (Exception e) {

            throw new SignatureException("RSA验证签名[content = " + content + "; charset = " + charset

                                         + "; signature = " + sign + "]发生异常!", e);

        }

    }



    private PublicKey getPublicKeyFromX509(String algorithm, InputStream ins) throws NoSuchAlgorithmException {

        try {

            KeyFactory keyFactory = KeyFactory.getInstance(algorithm);



            StringWriter writer = new StringWriter();

            StreamUtil.io(new InputStreamReader(ins), writer);

            byte[] encodedKey = writer.toString().getBytes();



            // 先base64解码

            encodedKey = Base64.decodeBase64(encodedKey);

            return keyFactory.generatePublic(new X509EncodedKeySpec(encodedKey));

        } catch (IOException ex) {

            // 不可能发生

        } catch (InvalidKeySpecException ex) {

            // 不可能发生

        }

        return null;

    }



    private byte[] getContentBytes(String content, String charset) throws UnsupportedEncodingException {

        if (StringUtil.isEmpty(charset)) {

            return content.getBytes();

        }



        return content.getBytes(charset);

    }

 注意：参数publicKey是Pem公钥文件中去除头（-----BEGIN RSA PRIVATE KEY-----）和尾（-----END RSA PRIVATE KEY-----）以及换行符后的字符串。

 

原文地址：http://xw-z1985.iteye.com/blog/1837376