jmeter对请求参数的签名处理

1.首先在本地写好签名的算法，本文采用RSA签名。
public final class Base64 {

static private final int     BASELENGTH           = 128;
static private final int     LOOKUPLENGTH         = 64;
static private final int     TWENTYFOURBITGROUP   = 24;
static private final int     EIGHTBIT             = 8;
static private final int     SIXTEENBIT           = 16;
static private final int     FOURBYTE             = 4;
static private final int     SIGN                 = -128;
static private final char    PAD                  = '=';
static private final boolean fDebug               = false;
static final private byte[]  base64Alphabet       = new byte[BASELENGTH];
static final private char[]  lookUpBase64Alphabet = new char[LOOKUPLENGTH];

static {
    for (int i = 0; i < BASELENGTH; ++i) {
        base64Alphabet[i] = -1;
    }
    for (int i = 'Z'; i >= 'A'; i--) {
        base64Alphabet[i] = (byte) (i - 'A');
    }
    for (int i = 'z'; i >= 'a'; i--) {
        base64Alphabet[i] = (byte) (i - 'a' + 26);
    }

    for (int i = '9'; i >= '0'; i--) {
        base64Alphabet[i] = (byte) (i - '0' + 52);
    }

    base64Alphabet['+'] = 62;
    base64Alphabet['/'] = 63;

    for (int i = 0; i <= 25; i++) {
        lookUpBase64Alphabet[i] = (char) ('A' + i);
    }

    for (int i = 26, j = 0; i <= 51; i++, j++) {
        lookUpBase64Alphabet[i] = (char) ('a' + j);
    }

    for (int i = 52, j = 0; i <= 61; i++, j++) {
        lookUpBase64Alphabet[i] = (char) ('0' + j);
    }
    lookUpBase64Alphabet[62] = (char) '+';
    lookUpBase64Alphabet[63] = (char) '/';

}

private static boolean isWhiteSpace(char octect) {
    return (octect == 0x20 || octect == 0xd || octect == 0xa || octect == 0x9);
}

private static boolean isPad(char octect) {
    return (octect == PAD);
}

private static boolean isData(char octect) {
    return (octect < BASELENGTH && base64Alphabet[octect] != -1);
}

/**
 * Encodes hex octects into Base64
 *
 * @param binaryData Array containing binaryData
 * @return Encoded Base64 array
 */
public static String encode(byte[] binaryData) {

    if (binaryData == null) {
        return null;
    }

    int lengthDataBits = binaryData.length * EIGHTBIT;
    if (lengthDataBits == 0) {
        return "";
    }

    int fewerThan24bits = lengthDataBits % TWENTYFOURBITGROUP;
    int numberTriplets = lengthDataBits / TWENTYFOURBITGROUP;
    int numberQuartet = fewerThan24bits != 0 ? numberTriplets + 1 : numberTriplets;
    char encodedData[] = null;

    encodedData = new char[numberQuartet * 4];

    byte k = 0, l = 0, b1 = 0, b2 = 0, b3 = 0;

    int encodedIndex = 0;
    int dataIndex = 0;
    if (fDebug) {
        System.out.println("number of triplets = " + numberTriplets);
    }

    for (int i = 0; i < numberTriplets; i++) {
        b1 = binaryData[dataIndex++];
        b2 = binaryData[dataIndex++];
        b3 = binaryData[dataIndex++];

        if (fDebug) {
            System.out.println("b1= " + b1 + ", b2= " + b2 + ", b3= " + b3);
        }

        l = (byte) (b2 & 0x0f);
        k = (byte) (b1 & 0x03);

        byte val1 = ((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0);
        byte val2 = ((b2 & SIGN) == 0) ? (byte) (b2 >> 4) : (byte) ((b2) >> 4 ^ 0xf0);
        byte val3 = ((b3 & SIGN) == 0) ? (byte) (b3 >> 6) : (byte) ((b3) >> 6 ^ 0xfc);

        if (fDebug) {
            System.out.println("val2 = " + val2);
            System.out.println("k4   = " + (k << 4));
            System.out.println("vak  = " + (val2 | (k << 4)));
        }

        encodedData[encodedIndex++] = lookUpBase64Alphabet[val1];
        encodedData[encodedIndex++] = lookUpBase64Alphabet[val2 | (k << 4)];
        encodedData[encodedIndex++] = lookUpBase64Alphabet[(l << 2) | val3];
        encodedData[encodedIndex++] = lookUpBase64Alphabet[b3 & 0x3f];
    }

    // form integral number of 6-bit groups
    if (fewerThan24bits == EIGHTBIT) {
        b1 = binaryData[dataIndex];
        k = (byte) (b1 & 0x03);
        if (fDebug) {
            System.out.println("b1=" + b1);
            System.out.println("b1<<2 = " + (b1 >> 2));
        }
        byte val1 = ((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0);
        encodedData[encodedIndex++] = lookUpBase64Alphabet[val1];
        encodedData[encodedIndex++] = lookUpBase64Alphabet[k << 4];
        encodedData[encodedIndex++] = PAD;
        encodedData[encodedIndex++] = PAD;
    } else if (fewerThan24bits == SIXTEENBIT) {
        b1 = binaryData[dataIndex];
        b2 = binaryData[dataIndex + 1];
        l = (byte) (b2 & 0x0f);
        k = (byte) (b1 & 0x03);

        byte val1 = ((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0);
        byte val2 = ((b2 & SIGN) == 0) ? (byte) (b2 >> 4) : (byte) ((b2) >> 4 ^ 0xf0);

        encodedData[encodedIndex++] = lookUpBase64Alphabet[val1];
        encodedData[encodedIndex++] = lookUpBase64Alphabet[val2 | (k << 4)];
        encodedData[encodedIndex++] = lookUpBase64Alphabet[l << 2];
        encodedData[encodedIndex++] = PAD;
    }

    return new String(encodedData);
}

/**
 * Decodes Base64 data into octects
 *
 * @param encoded string containing Base64 data
 * @return Array containind decoded data.
 */
public static byte[] decode(String encoded) {

    if (encoded == null) {
        return null;
    }

    char[] base64Data = encoded.toCharArray();
    // remove white spaces
    int len = removeWhiteSpace(base64Data);

    if (len % FOURBYTE != 0) {
        return null;//should be divisible by four
    }

    int numberQuadruple = (len / FOURBYTE);

    if (numberQuadruple == 0) {
        return new byte[0];
    }

    byte decodedData[] = null;
    byte b1 = 0, b2 = 0, b3 = 0, b4 = 0;
    char d1 = 0, d2 = 0, d3 = 0, d4 = 0;

    int i = 0;
    int encodedIndex = 0;
    int dataIndex = 0;
    decodedData = new byte[(numberQuadruple) * 3];

    for (; i < numberQuadruple - 1; i++) {

        if (!isData((d1 = base64Data[dataIndex++])) || !isData((d2 = base64Data[dataIndex++]))
            || !isData((d3 = base64Data[dataIndex++]))
            || !isData((d4 = base64Data[dataIndex++]))) {
            return null;
        }//if found "no data" just return null

        b1 = base64Alphabet[d1];
        b2 = base64Alphabet[d2];
        b3 = base64Alphabet[d3];
        b4 = base64Alphabet[d4];

        decodedData[encodedIndex++] = (byte) (b1 << 2 | b2 >> 4);
        decodedData[encodedIndex++] = (byte) (((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf));
        decodedData[encodedIndex++] = (byte) (b3 << 6 | b4);
    }

    if (!isData((d1 = base64Data[dataIndex++])) || !isData((d2 = base64Data[dataIndex++]))) {
        return null;//if found "no data" just return null
    }

    b1 = base64Alphabet[d1];
    b2 = base64Alphabet[d2];

    d3 = base64Data[dataIndex++];
    d4 = base64Data[dataIndex++];
    if (!isData((d3)) || !isData((d4))) {//Check if they are PAD characters
        if (isPad(d3) && isPad(d4)) {
            if ((b2 & 0xf) != 0)//last 4 bits should be zero
            {
                return null;
            }
            byte[] tmp = new byte[i * 3 + 1];
            System.arraycopy(decodedData, 0, tmp, 0, i * 3);
            tmp[encodedIndex] = (byte) (b1 << 2 | b2 >> 4);
            return tmp;
        } else if (!isPad(d3) && isPad(d4)) {
            b3 = base64Alphabet[d3];
            if ((b3 & 0x3) != 0)//last 2 bits should be zero
            {
                return null;
            }
            byte[] tmp = new byte[i * 3 + 2];
            System.arraycopy(decodedData, 0, tmp, 0, i * 3);
            tmp[encodedIndex++] = (byte) (b1 << 2 | b2 >> 4);
            tmp[encodedIndex] = (byte) (((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf));
            return tmp;
        } else {
            return null;
        }
    } else { //No PAD e.g 3cQl
        b3 = base64Alphabet[d3];
        b4 = base64Alphabet[d4];
        decodedData[encodedIndex++] = (byte) (b1 << 2 | b2 >> 4);
        decodedData[encodedIndex++] = (byte) (((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf));
        decodedData[encodedIndex++] = (byte) (b3 << 6 | b4);

    }

    return decodedData;
}

/**
 * remove WhiteSpace from MIME containing encoded Base64 data.
 *
 * @param data  the byte array of base64 data (with WS)
 * @return      the new length
 */
private static int removeWhiteSpace(char[] data) {
    if (data == null) {
        return 0;
    }

    // count characters that's not whitespace
    int newSize = 0;
    int len = data.length;
    for (int i = 0; i < len; i++) {
        if (!isWhiteSpace(data[i])) {
            data[newSize++] = data[i];
        }
    }
    return newSize;
}

}
　　
import java.security.KeyFactory;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;

public class RSA
{
private static final String SIGN_ALGORITHMS = “MD5WithRSA”;

/**
* RSA验签名检查
* @param content 待签名数据
* @param sign 签名值
* @param ali_public_key  爱贝公钥
* @param input_charset 编码格式
* @return 布尔值
*/
public static boolean verify(String content, String sign, String iapp_pub_key, String input_charset)
{
    try
    {
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        byte[] encodedKey = Base64.decode(iapp_pub_key);
        PublicKey pubKey = keyFactory.generatePublic(new X509EncodedKeySpec(encodedKey));


        java.security.Signature signature = java.security.Signature
        .getInstance(SIGN_ALGORITHMS);

        signature.initVerify(pubKey);
        signature.update( content.getBytes(input_charset) );
        return signature.verify( Base64.decode(sign) );

    }
    catch (Exception e)
    {
        e.printStackTrace();
    }

    return false;
}

/**
* RSA签名
* @param content 待签名数据
* @param privateKey 商户私钥
* @param input_charset 编码格式
* @return 签名值
*/
public static String sign(String content, String privateKey, String input_charset)
{
    try
    {
        PKCS8EncodedKeySpec priPKCS8    = new PKCS8EncodedKeySpec( Base64.decode(privateKey) );
        KeyFactory keyf                 = KeyFactory.getInstance("RSA");
        PrivateKey priKey               = keyf.generatePrivate(priPKCS8);

        java.security.Signature signature = java.security.Signature
            .getInstance(SIGN_ALGORITHMS);

        signature.initSign(priKey);
        signature.update( content.getBytes(input_charset) );

        byte[] signed = signature.sign();

        return Base64.encode(signed);
    }
    catch (Exception e)
    {
        e.printStackTrace();
    }

    return null;
}

}
　　
package com.zyzxpay.sign;

public class SignHelper
{
// 字符编码格式 ，目前支持 utf-8
public static String input_charset = “utf-8”;

public static boolean verify(String content, String sign, String pubKey)
{
    // 目前版本，只支持RSA
    return RSA.verify(content, sign, pubKey, input_charset);
}

public static String sign(String content, String privateKey)
{
    return RSA.sign(content, privateKey, input_charset);
}

}

2.将以上3个类生成jar包，在jmeter的计划中引入。

3.添加http请求，并在该请求下添加用户变量，存储我们用来签名的数据，也可用上个接口的响应结果存储起来作为要签名的数据。

在http请求的参数中，引用变量${content}

4.在http请求下添加BeanShell PreProcessor，处理签名的参数，并存在sign*http请求调用，先导入签名类：import com.paydela.*;

import com.paydela.*;

System.out.println(vars.get(“content”));
System.out.println(vars.get(“aaa”));
String content =vars.get(“content”);
String result = SignHelper.sign(content, “”);
System.out.println(result);
vars.put(“sign”,result);

5.在http请求中用${sign}来引用签名后的数据

6.在http请求下添加BeanShell PostProcessor，用来处理响应结果

import java.io.UnsupportedEncodingException;

System.out.println(prev.getResponseCode());
String str = prev.getResponseDataAsString();
/*
String result = ${__urldecode(str)};
System.out.println(“————”+result);
*/
String result = “”;
try {
result = java.net.URLDecoder.decode(str, “UTF-8”);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
System.out.println(“result:”+result);

vars.put(“result”,result);

7.添加结果树、debug等，运行后便可以看到签名的请求数据以及响应结果