Android 中实现 MD5、SHA1 散列算法

ITPOW2017/3/11 15:56:45

核心代码并不多，但是为了使用方便，我们封装了一下。

public class HashHelper
{
    public static String md5(String str)
    {
        return md5(str, "utf-8");
    }


    public static String md5(String str, String encoding)
    {
        String result = "";

        try {
            result = hash("md5", str, encoding);
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }

        return result;
    }


    public static String sha1(String str)
    {
        return sha1(str, "utf-8");
    }


    public static String sha1(String str, String encoding)
    {
        String result = "";

        try {
            result = hash("sha1", str, encoding);
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }

        return result;
    }


    public static String hash(String hashName, String str, String encoding) throws NoSuchAlgorithmException, UnsupportedEncodingException {
        MessageDigest md = MessageDigest.getInstance(hashName);
        md.update(str.getBytes(encoding));
        byte[] result = md.digest();
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < result.length; i++) {
            int val = result[i] & 0xff;
            if (val < 0xf) {
                sb.append("0");
            }
            sb.append(Integer.toHexString(val));
        }
        return sb.toString().toUpperCase();
    }
}

md5(String str)
md5(String str, String encoding)
sha1(String str)
sha1(String str, String encoding)
hash(String hashName, String str, String encoding)

<<返回首页<<