Cordova插件之原生MD5加密

PART_A插件目录结构

|—deppon.md5
|——src
|———android
|————MD5Tool.java
|————BASE64Encoder.java
|————CharacterEncoder.java
|——www
|———md5.js
|——plugin.xml

结构如图

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PART_B具体代码

• plugin.xml配置文件

  <?xml version="1.0" encoding="UTF-8"?><plugin xmlns="http://apache.org/cordova/ns/plugins/1.0"    id="deppon.md5"    version="0.0.5">    <name>Deppon MD5</name>    <description>this is based on JavaAPI</description>    <!-- js中间件的目录指定 -->    <js-module src="www/md5.js" name="md5">        <!-- target值为js调用的对象符号 -->        <clobbers target="deppon"/>    </js-module>    <platform name="android">        <!-- 原生代码 -->        <source-file src="src/android/MD5Tool.java" target-dir="src/catface/plugin"/>        <source-file src="src/android/BASE64Encoder.java" target-dir="src/catface/plugin"/>        <source-file src="src/android/CharacterEncoder.java" target-dir="src/catface/plugin"/>        <!-- 配置中间件及插件类 -->        <config-file target="res/xml/config.xml" parent="/*">            <!-- name值为中间件调用原生代码的对象符号 -->            <feature name="MD5Tool">                <!-- value值为插件类的包类路径 -->                <param name="android-package" value="catface.plugin.MD5Tool"/>            </feature>        </config-file>    </platform></plugin>

• js中间件

  var exec = require('cordova/exec');var catfaceFunc = function(){};// arg1：成功回调// arg2：失败回调// arg3：将要调用类配置的标识// arg4：调用的原生代码中的方法名// arg5：参数，json格式catfaceFunc.prototype.str2MD5=function(str, success, error) {    exec(success, error, "MD5Tool", "str2MD5", [str]);};var catfaceFunc = new catfaceFunc();module.exports = catfaceFunc;

• Java代码

public class MD5Tool extends CordovaPlugin {    @Override    public boolean execute(String action, JSONArray args, CallbackContext callbackContext) throws JSONException {        if (action.equals("str2MD5")) {            // 获取js传入的参数            String str = args.getString(0);            // 加密            String result = str2MD5(str);            if (!"".equals(result)) {                callbackContext.success(result);            } else {                // 失败回调，结果传空字符串                callbackContext.error("error");            }        }        return true;    }    // MD5 + BASE64加密    private static String str2MD5(String origin) {        String resultString = new String(origin);        MessageDigest md = null;        try {            md = MessageDigest.getInstance("MD5");            byte[] buf = md.digest(resultString.getBytes());            // BASE64Encoder + CharacterEncoder作为辅助类            BASE64Encoder encoder = new BASE64Encoder();            return encoder.encode(buf);        } catch (NoSuchAlgorithmException e) {            e.printStackTrace();        }        return "";    }}

• 加密中需要的两个类，不需手动修改，直接导入即可

  • BASE64Encoder

    public class BASE64Encoder extends CharacterEncoder {    private final static int NUMBER_ZERO = 0;    private final static int NUMBER_ONE = 1;    private final static int NUMBER_TWO = 2;    private final static int NUMBER_THREE = 3;    private final static int NUMBER_FOUR= 4;    private final static int NUMBER_FIVE = 5;    private final static int NUMBER_SIX= 6;    private final static int NUMBER_SEVEN = 7;    protected int bytesPerAtom() {        return (NUMBER_THREE);    }    protected int bytesPerLine() {        return 200;    }    private final static char pem_array[] = {        //       0   1   2   3   4   5   6   7                'A','B','C','D','E','F','G','H', // 0                'I','J','K','L','M','N','O','P', // 1                'Q','R','S','T','U','V','W','X', // 2                'Y','Z','a','b','c','d','e','f', // 3                'g','h','i','j','k','l','m','n', // 4                'o','p','q','r','s','t','u','v', // 5                'w','x','y','z','0','1','2','3', // 6                '4','5','6','7','8','9','+','/'  // 7        };    protected void encodeAtom(OutputStream outStream, byte data[], int offset, int len)        throws IOException {        byte a, b, c;        if (len == NUMBER_ONE) {            a = data[offset];            b = NUMBER_ZERO;            c = NUMBER_ZERO;            outStream.write(pem_array[(a >>> NUMBER_TWO) & 0x3F]);            outStream.write(pem_array[((a << NUMBER_FOUR) & 0x30) + ((b >>> NUMBER_FOUR) & 0xf)]);            outStream.write('=');            outStream.write('=');        } else if (len == NUMBER_TWO) {            a = data[offset];            b = data[offset+1];            c = NUMBER_ZERO;            outStream.write(pem_array[(a >>> NUMBER_TWO) & 0x3F]);            outStream.write(pem_array[((a << NUMBER_FOUR) & 0x30) + ((b >>> NUMBER_FOUR) & 0xf)]);            outStream.write(pem_array[((b << NUMBER_TWO) & 0x3c) + ((c >>> NUMBER_SIX) & 0x3)]);            outStream.write('=');        } else {            a = data[offset];            b = data[offset+1];            c = data[offset+2];            outStream.write(pem_array[(a >>> NUMBER_TWO) & 0x3F]);            outStream.write(pem_array[((a << NUMBER_FOUR) & 0x30) + ((b >>> NUMBER_FOUR) & 0xf)]);            outStream.write(pem_array[((b << NUMBER_TWO) & 0x3c) + ((c >>> NUMBER_SIX) & 0x3)]);            outStream.write(pem_array[c & 0x3F]);        }    }}

  • CharacterEncoder

    import java.io.ByteArrayInputStream;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.io.PrintStream;import java.nio.ByteBuffer;public abstract class CharacterEncoder {    protected PrintStream pStream;    abstract protected int bytesPerAtom();    abstract protected int bytesPerLine();    protected void encodeBufferPrefix(OutputStream aStream) throws IOException {        pStream = new PrintStream(aStream);    }    protected void encodeBufferSuffix(OutputStream aStream) throws IOException {    }    protected void encodeLinePrefix(OutputStream aStream, int aLength) throws IOException {    }    protected void encodeLineSuffix(OutputStream aStream) throws IOException {        pStream.println();    }    abstract protected void encodeAtom(OutputStream aStream, byte someBytes[], int anOffset, int aLength)            throws IOException;    protected int readFully(InputStream in, byte buffer[]) throws IOException {        for (int i = 0; i < buffer.length; i++) {            int q = in.read();            if (q == -1) {                return i;            }            buffer[i] = (byte) q;        }        return buffer.length;    }    public void encode(InputStream inStream, OutputStream outStream) throws IOException {        int j;        int numBytes;        byte tmpbuffer[] = new byte[bytesPerLine()];        encodeBufferPrefix(outStream);        while (true) {            numBytes = readFully(inStream, tmpbuffer);            if (numBytes == 0) {                break;            }            encodeLinePrefix(outStream, numBytes);            for (j = 0; j < numBytes; j += bytesPerAtom()) {                if ((j + bytesPerAtom()) <= numBytes) {                    encodeAtom(outStream, tmpbuffer, j, bytesPerAtom());                } else {                    encodeAtom(outStream, tmpbuffer, j, (numBytes) - j);                }            }            if (numBytes < bytesPerLine()) {                break;            } else {                encodeLineSuffix(outStream);            }        }        encodeBufferSuffix(outStream);    }    public void encode(byte aBuffer[], OutputStream aStream) throws IOException {        ByteArrayInputStream inStream = new ByteArrayInputStream(aBuffer);        encode(inStream, aStream);    }    public String encode(byte aBuffer[]) {        ByteArrayOutputStream outStream = new ByteArrayOutputStream();        ByteArrayInputStream inStream = new ByteArrayInputStream(aBuffer);        String retVal = null;        try {            encode(inStream, outStream);            retVal = outStream.toString("8859_1");        } catch (Exception e) {            throw new Error("CharacterEncoder.encode internal error",e);        }        return (retVal);    }    private byte[] getBytes(ByteBuffer bb) {        byte[] buf = null;        if (bb.hasArray()) {            byte[] tmp = bb.array();            if ((tmp.length == bb.capacity()) && (tmp.length == bb.remaining())) {                buf = tmp;                bb.position(bb.limit());            }        }        if (buf == null) {            buf = new byte[bb.remaining()];            bb.get(buf);        }        return buf;    }    public void encode(ByteBuffer aBuffer, OutputStream aStream) throws IOException {        byte[] buf = getBytes(aBuffer);        encode(buf, aStream);    }    public String encode(ByteBuffer aBuffer) {        byte[] buf = getBytes(aBuffer);        return encode(buf);    }    public void encodeBuffer(InputStream inStream, OutputStream outStream) throws IOException {        int j;        int numBytes;        byte tmpbuffer[] = new byte[bytesPerLine()];        encodeBufferPrefix(outStream);        while (true) {            numBytes = readFully(inStream, tmpbuffer);            if (numBytes == 0) {                break;            }            encodeLinePrefix(outStream, numBytes);            for (j = 0; j < numBytes; j += bytesPerAtom()) {                if ((j + bytesPerAtom()) <= numBytes) {                    encodeAtom(outStream, tmpbuffer, j, bytesPerAtom());                } else {                    encodeAtom(outStream, tmpbuffer, j, (numBytes) - j);                }            }            encodeLineSuffix(outStream);            if (numBytes < bytesPerLine()) {                break;            }        }        encodeBufferSuffix(outStream);    }    public void encodeBuffer(byte aBuffer[], OutputStream aStream) throws IOException {        ByteArrayInputStream inStream = new ByteArrayInputStream(aBuffer);        encodeBuffer(inStream, aStream);    }    public String encodeBuffer(byte aBuffer[]) {        ByteArrayOutputStream outStream = new ByteArrayOutputStream();        ByteArrayInputStream inStream = new ByteArrayInputStream(aBuffer);        try {            encodeBuffer(inStream, outStream);        } catch (Exception e) {            throw new Error("CharacterEncoder.encodeBuffer internal error",e);        }        return (outStream.toString());    }    public void encodeBuffer(ByteBuffer aBuffer, OutputStream aStream) throws IOException {        byte[] buf = getBytes(aBuffer);        encodeBuffer(buf, aStream);    }    public String encodeBuffer(ByteBuffer aBuffer) {        byte[] buf = getBytes(aBuffer);        return encodeBuffer(buf);    }}

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使用方式

deppon.str2MD5(str, function(msg) {    alert(msg); // 加密后结果}, function(err) {    alert(err); // 失败返回空字符串""})

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以上。如有错误和疑问，欢迎指正提出。 [e-mail]