文件哈希生成器在命令提示符使用文件路徑

Question

我有以下Java代碼生成哈希基於輸入文本。

package main; 
import java.util.Scanner; 
import java.math.BigInteger; 
import java.security.MessageDigest; 
import java.security.NoSuchAlgorithmException; 

public class String_Hash_Generator { 
    public static void main(String args[]) throws NoSuchAlgorithmException { 
     Scanner inputScanner = new Scanner(System.in); 
     System.out.print("Input: "); 
     String input = inputScanner.next(); 

     /* MD2 */ 
     MessageDigest objMD2 = MessageDigest.getInstance("MD2"); 
     byte[] bytMD2 = objMD2.digest(input.getBytes()); 
     BigInteger intNumMD2 = new BigInteger(1, bytMD2); 
     String hcMD2 = intNumMD2.toString(16); 
     while (hcMD2.length() < 32) { 
      hcMD2 = "0" + hcMD2; 
     } 

     /* MD5 */ 
     MessageDigest objMD5 = MessageDigest.getInstance("MD5"); 
     byte[] bytMD5 = objMD5.digest(input.getBytes()); 
     BigInteger intNumMD5 = new BigInteger(1, bytMD5); 
     String hcMD5 = intNumMD5.toString(16); 
     while (hcMD5.length() < 32) { 
      hcMD5 = "0" + hcMD5; 
     } 

     /* SHA-1 */ 
     MessageDigest objSHA1 = MessageDigest.getInstance("SHA-1"); 
     byte[] bytSHA1 = objSHA1.digest(input.getBytes()); 
     BigInteger intNumSHA1 = new BigInteger(1, bytSHA1); 
     String hcSHA1 = intNumSHA1.toString(16); 
     while (hcSHA1.length() < 40) { 
      hcSHA1 = "0" + hcSHA1; 
     } 


     /* SHA-256 */ 
     MessageDigest objSHA256 = MessageDigest.getInstance("SHA-256"); 
     byte[] bytSHA256 = objSHA256.digest(input.getBytes()); 
     BigInteger intNumSHA256 = new BigInteger(1, bytSHA256); 
     String hcSHA256 = intNumSHA256.toString(16); 
     while (hcSHA256.length() < 64) { 
      hcSHA256 = "0" + hcSHA256; 
     } 

     /* SHA-384 */ 

     MessageDigest objSHA384 = MessageDigest.getInstance("SHA-384"); 
     byte[] bytSHA384 = objSHA384.digest(input.getBytes()); 
     BigInteger intNumSHA384 = new BigInteger(1, bytSHA384); 
     String hcSHA384 = intNumSHA384.toString(16); 
     while (hcSHA384.length() < 96) { 
      hcSHA384 = "0" + hcSHA384; 
     } 

     /* SHA-512 */ 
     MessageDigest objSHA512 = MessageDigest.getInstance("SHA-512"); 
     byte[] bytSHA512 = objSHA512.digest(input.getBytes()); 
     BigInteger intNumSHA512 = new BigInteger(1, bytSHA512); 
     String hcSHA512 = intNumSHA512.toString(16); 
     while (hcSHA512.length() < 128) { 
      hcSHA512 = "0" + hcSHA512; 
     } 

     System.out.println("\nMD2: " + hcMD2 
         + "\nMD5: " + hcMD5 
         + "\nSHA-1: " + hcSHA1 
         + "\nSHA-256: " + hcSHA256 
         + "\nSHA-384: " + hcSHA384 
         + "\nSHA-512: " + hcSHA512); 
    } 
} 

輸入需要是掃描儀，因爲它必須在命令提示符下運行。

怎能一個文件散列發生器被創建，是以文件路徑，如C:\Program Files\WinRAR\Rar.exe並生成散列（MD2，MD5，SHA-1，SHA-256，SHA-384，SHA-512）？

編輯：我唯一能夠找到的解決方案只使用文件的名稱，而不是整個路徑。

Answer 1

首先，您需要一種機制以十六進制形式打印byte[]。從上面的答案How to convert a byte array to a hex string in Java?你可以做，

final protected static char[] hexArray = "ABCDEF".toCharArray(); 
public static String bytesToHex(byte[] bytes) { 
    char[] hexChars = new char[bytes.length * 2]; 
    for (int j = 0; j < bytes.length; j++) { 
     int v = bytes[j] & 0xFF; 
     hexChars[j * 2] = hexArray[v >>> 4]; 
     hexChars[j * 2 + 1] = hexArray[v & 0x0F]; 
    } 
    return new String(hexChars); 
} 

然後，你可以使用Files.readAllBytes(Path)閱讀您的文件（S）。最後，迭代一個哈希算法數組來計算每個哈希。類似的，

public static void main(String args[]) { 
    Scanner inputScanner = new Scanner(System.in); 
    String[] hashAlgos = { "MD2", "MD5", "SHA-1", "SHA-256", "SHA-384", "SHA-512" }; 
    System.out.print("Input: "); 
    String input = inputScanner.next(); 
    try { 
     byte[] fileContents = Files.readAllBytes(new File(input).toPath()); 
     for (String algo : hashAlgos) { 
      MessageDigest md = MessageDigest.getInstance(algo); 
      byte[] hash = md.digest(fileContents); 
      System.out.printf("%s %s%n", algo, bytesToHex(hash)); 
     } 
    } catch (NoSuchAlgorithmException | IOException e) { 
     e.printStackTrace(); 
    } 
}