DigestUtils.java
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package com.objecteye.utils;
import org.apache.commons.codec.binary.Hex;
import java.security.GeneralSecurityException;
import java.security.MessageDigest;
import java.util.Random;
public class DigestUtils {
/**
* 加密遵循RFC2671规范 将相关参数加密生成一个MD5字符串,并返回
*/
public static String getResponse(
String username,
String realm,
String password,
String nonce,
String nc,
String cnonce,
String qop,
String method,
String uri
) {
String A1 = username + ":" + realm + ":" + password;
byte[] md5ByteA1 = md5(A1.getBytes());
String HA1 = new String(Hex.encodeHex(md5ByteA1));
String A2 = method + ":" + uri;
byte[] md5ByteA2 = md5(A2.getBytes());
String HA2 = new String(Hex.encodeHex(md5ByteA2));
String original = HA1 + ":" + (nonce + ":" + nc + ":" + cnonce + ":" + qop) + ":" + HA2;
byte[] md5ByteOriginal = md5(original.getBytes());
return new String(Hex.encodeHex(md5ByteOriginal));
}
public static String getAuthorization(String username, String realm, String nonce, String uri, String qop, String nc, String cnonce, String response, String opaque) {
return "Digest username=\"" + username + "\"" +
",realm=\"" + realm + "\"" +
",nonce=\"" + nonce + "\"" +
",uri=\"" + uri + "\"" +
",qop=\"" + qop + "\"" +
",nc=\"" + nc + "\"" +
",cnonce=\"" + cnonce + "\"" +
",response=\"" + response + "\"" +
",opaque=\"" + opaque;
}
/**
* 对输入字符串进行md5散列.
*/
public static byte[] md5(byte[] input) {
return digest(input, "MD5", null, 1);
}
/**
* 对字符串进行散列, 支持md5与sha1算法.
*/
private static byte[] digest(byte[] input, String algorithm, byte[] salt, int iterations) {
try {
MessageDigest digest = MessageDigest.getInstance(algorithm);
if (salt != null) {
digest.update(salt);
}
byte[] result = digest.digest(input);
for (int i = 1; i < iterations; i++) {
digest.reset();
result = digest.digest(result);
}
return result;
} catch (GeneralSecurityException e) {
throw new RuntimeException(e);
}
}
public static String generateSalt2(int length) {
StringBuilder val = new StringBuilder();
Random random = new Random();
//参数length，表示生成几位随机数
for (int i = 0; i < length; i++) {
//输出字母还是数字
if (random.nextInt(2) % 2 == 0) {
//输出是大写字母还是小写字母
val.append((char) (random.nextInt(26) + random.nextInt(2) % 2 == 0 ? 65 : 97));
} else {
val.append(random.nextInt(10));
}
}
return val.toString().toLowerCase();
}
}