Java Implementation String SHA1 Encryption Method

Directory Java String SHA1 Encryption Import Class Definition Function javaSHA1 Encryption Decryption Encapsulation 1 Method for Encryption Main Function Test

Java String SHA1 Encryption

Import class

import java.security.MessageDigest;

Definition function

private String toUserPwd(final String password) {
  try {
   if (password == null) {
    return null;
   }
   final MessageDigest messageDigest = MessageDigest.getInstance("SHA");
   final byte[] digests = messageDigest.digest(password.getBytes());
   final StringBuilder stringBuilder = new StringBuilder();
   for (int i = 0; i < digests.length; i++) {
    int halfbyte = (digests[i] >>> 4) & 0x0F;
    for (int j = 0; j <= 1; j++) {
     stringBuilder.append(
       ((0 <= halfbyte) && (halfbyte <= 9))
         ? (char) ('0' + halfbyte)
         : (char) ('a' + (halfbyte - 10)));
     halfbyte = digests[i] & 0x0F;
    }
   }
   return stringBuilder.toString();
  } catch (final Throwable throwable) {
   this.log.error("error converting password", throwable);
   return null;
  }
 }

javaSHA1 Encryption and Decryption

Encapsulate 1 method for encryption

/**
     * sha1 Encryption 
     * @param data
     * @return
     * @throws NoSuchAlgorithmException 
     */
    public static String sha1(String data) throws NoSuchAlgorithmException {
        // Add salt     Safer 1 Some 
        data += "lyz";
        // Information Summarizer                                  Algorithm name 
        MessageDigest md = MessageDigest.getInstance("SHA1");
        // Convert a string into a byte array 
        byte[] b = data.getBytes();
        // Updates our summary with the specified bytes 
        md.update(b);
        // Get the ciphertext    (Complete summary calculation) 
        byte[] b2 = md.digest();
        // Gets the calculated length 
        int len = b2.length;
        //16 Binary string 
        String str = "0123456789abcdef";
        // Convert a string to an array of strings 
        char[] ch = str.toCharArray();
        
        // Create 1 A 40 Bit length byte array 
        char[] chs = new char[len*2];
        // Cycle 20 Times 
        for(int i=0,k=0;i<len;i++) {
            byte b3 = b2[i];// Gets each byte in the byte array after digest calculation 
            // >>>: Unsigned right shift   
            // &: Bitwise and 
            //0xf:0-15 The number of 
            chs[k++] = ch[b3 >>> 4 & 0xf];
            chs[k++] = ch[b3 & 0xf];
        }
        
        // Character array to string 
        return new String(chs);
    }

Main function test

    public static void main(String[] args) throws NoSuchAlgorithmException {
        String data = " Jumping beam adzuki bean tlxd666";
        String result = sha1(data);
        System.out.println(" After encryption: "+result);
    }