Question

我正在寻找一种方法来获取带有Java字节数组的SHA-1校验和作为消息。

我应该使用第三方工具还是JVM中内置了可以提供帮助的内容？

Answer 1

怎么样：

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Formatter;

public static String SHAsum(byte[] convertme) throws NoSuchAlgorithmException{
    MessageDigest md = MessageDigest.getInstance("SHA-1"); 
    return byteArray2Hex(md.digest(convertme));
}

private static String byteArray2Hex(final byte[] hash) {
    Formatter formatter = new Formatter();
    for (byte b : hash) {
        formatter.format("%02x", b);
    }
    return formatter.toString();
}

Answer 2

这是我们用来转换为SHA-1的代码片段，但需要String代替Byte[]，请参阅此javadoc以获取更多信息

        import java.io.UnsupportedEncodingException;
        import java.security.MessageDigest;
        import java.security.NoSuchAlgorithmException;

        public class DoSHA1 {

            private static String convToHex(byte[] data) {
                StringBuilder buf = new StringBuilder();
                for (int i = 0; i < data.length; i++) {
                    int halfbyte = (data[i] >>> 4) & 0x0F;
                    int two_halfs = 0;
                    do {
                        if ((0 <= halfbyte) && (halfbyte <= 9))
                            buf.append((char) ('0' + halfbyte));
                        else
                            buf.append((char) ('a' + (halfbyte - 10)));
                        halfbyte = data[i] & 0x0F;
                    } while(two_halfs++ < 1);
                }
                return buf.toString();
            }

            public static String SHA1(String text) throws NoSuchAlgorithmException,
UnsupportedEncodingException  {
            MessageDigest md = MessageDigest.getInstance("SHA-1");
            byte[] sha1hash = new byte[40];
            md.update(text.getBytes("iso-8859-1"), 0, text.length());
            sha1hash = md.digest();
            return convToHex(sha1hash);
            }
        }

Answer 3

您可以自己动手，也可以依赖已经证明可以像Commons Codec一样运作的库。 DigestUtils类有几种计算哈希的方法..

Answer 4

来自CommonCodec DigestUtils实现在摘要计算之后的十六进制转换，如前所示：

MessageDigest md = MessageDigest.getInstance("SHA-1"); 
return byteArray2Hex(md.digest(convertme));

应为http://commons.apache.org/codec/apidocs/src-html/org/apache/commons/codec/binary/Hex.html#line.129：

private static final char[] DIGITS_LOWER = 
   {'0', '1', '2', '3', '4', '5', '6', '7',
    '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};

private static final char[] DIGITS_UPPER = 
   {'0', '1', '2', '3', '4', '5', '6', '7',
    '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};

protected static char[] encodeHex(byte[] data, char[] toDigits) {
    int l = data.length;
    char[] out = new char[l << 1];
    // two characters form the hex value.
    for (int i = 0, j = 0; i < l; i++) {
        out[j++] = toDigits[(0xF0 & data[i]) >>> 4];
        out[j++] = toDigits[0x0F & data[i]];
    }
    return out;
}

protected static int toDigit(char ch, int index) throws DecoderException {
    int digit = Character.digit(ch, 16);
    if (digit == -1) {
        throw new DecoderException(
                    "Illegal hexadecimal character " 
            + ch + " at index " + index);
    }
    return digit;
}

public static String exampleSha1(String convertme){
    MessageDigest md = MessageDigest.getInstance("SHA-1"); 
    byte[] encodeHex = md.digest(convertme));
    return new String(encodeHex);
}

Answer 5

......另一种选择是使用Spring：

<bean id="passwordEncoder" class="org.springframework.security.authentication.encoding.ShaPasswordEncoder">
     <constructor-arg value="256"/>
 </bean>

了解更多here

HTH

Answer 6

我只是用它来计算dex文件中的哈希值，并将其与dex文件中保存的值进行比较。

我知道这个代码没有非常好的风格，但它更多的PoC，只需要一些不是时间关键的研究。也许有人可以使用它！

class CheckDex{
public boolean checkSHA1(File f) throws IOException, NoSuchAlgorithmException{
    RandomAccessFile raf = new RandomAccessFile(f, "r");
    byte[] sig = new byte[20];
    raf.seek(0xC);
    for(int i = 0; i < 20; i++){
        sig[i] = (byte) raf.readUnsignedByte();
    }

    MessageDigest md = MessageDigest.getInstance("SHA-1"); 

    byte[] code = new byte[(int) (raf.length()-32)];
    for(int i = 0; i < code.length; i++){
        code[i] = (byte) raf.readUnsignedByte();
    }
    byte[] comsig = md.digest(code);

    raf.close();
    return Arrays.equals(sig,comsig);
}
}

Answer 7

如何使用它：

public class sha1Calculate {

    public static void main(String[] args)throws Exception
    {
         File file = new File("D:\\Android Links.txt");
        String outputTxt= "";
        String hashcode = null;

        try {

            FileInputStream input = new FileInputStream(file);

            ByteArrayOutputStream output = new ByteArrayOutputStream ();
            byte [] buffer = new byte [65536];
            int l;

            while ((l = input.read (buffer)) > 0)
                output.write (buffer, 0, l);

            input.close ();
            output.close ();

            byte [] data = output.toByteArray ();


                MessageDigest digest = MessageDigest.getInstance( "SHA-1" ); 

            byte[] bytes = data;

            digest.update(bytes, 0, bytes.length);
            bytes = digest.digest();

            StringBuilder sb = new StringBuilder();

            for( byte b : bytes )
            {
                sb.append( String.format("%02X", b) );
            }

                System.out.println("Digest(in hex format):: " + sb.toString());


        }catch (FileNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (NoSuchAlgorithmException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    }

}

Answer 8

以下代码将给定的 byte[] 转换为 SHA-1 哈希的 String。

import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public static String hash(byte data[]) throws NoSuchAlgorithmException
{
   MessageDigest digest;
   BigInteger big;
   String result;
   byte hash[];

   digest = MessageDigest.getInstance("SHA-1"); 
   hash   = digest.digest(data);
   big    = new BigInteger(1, hash);
   result = big.toString(16);

   return result;
}

注意：前导零将被修剪。因此，这可能会或可能不会起作用，具体取决于您的用例。

计算字节数组的SHA-1

8 个答案: