SHA算法：签名串SHA算法Java语言参考(SHAHelper.java)

package com.util; 
/** 
 * @author wangxiangyu
 * @date：2017年10月16日 上午9:00:47 
 * 类说明：SHA签名算法
 */
public class SHAHelper {

    private final static String[] hexDigits = { "0", "1", "2", "3", "4", "5","6", "7", "8", "9", "A", "B", "C", "D", "E", "F"};
    
    /**
     * 转换字节数组为16进制字串
     * 
     * @param b 字节数组
     * @return 16进制字串
     */
    public static String byteArrayToHexString(byte[] b) {
        StringBuffer resultSb = new StringBuffer();
        for (int i = 0; i < b.length; i++) {
            resultSb.append(byteToHexString(b[i]));
        }
        return resultSb.toString();
    }

    private static String byteToHexString(byte b) {
        int n = b;
        if (n < 0)
            n = 256 + n;
        int d1 = n / 16;
        int d2 = n % 16;
        return hexDigits[d1] + hexDigits[d2];
    }

    /**
     * SHA摘要计算(byte[]).
     * 
     * @param src byte[]
     * @throws Exception
     * @return byte[] 16 bit digest
     */
    public static byte[] SHADigest(byte[] src) throws Exception {
        java.security.MessageDigest alg = java.security.MessageDigest
                .getInstance("SHA");
        return alg.digest(src);
    }
    
    /**
     * SHA摘要计算(String).
     * 
     * @param src String型的目标串
     * @throws Exception
     * @return String
     */
    public static String SHADigest(String src) throws Exception {
        return byteArrayToHexString(SHADigest(src.getBytes("UTF-8")));
    }

    /** Test crypt */
    public static void main(String[] args) {
        try {
            // 获得的明文数据
            String serialNumber = "0101102010031723101273807F00179E";
            String reqBizArgs = "<ReqBizArgs version=‘1‘><test>test</test></ReqBizArgs>";
            String key = "8204CDBD76BB69DAE040007F010017A4";
            String desStr = serialNumber + reqBizArgs + key;
            System.out.println("原文串 desStr = ‘" + desStr + "‘");
            // 生成Signature
            String signature = SHADigest(desStr);
            System.out.println("签名串Signature = ‘" + signature + "‘");
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

}