Apache base64 codec encode / decode - not getting expected result
I made a POC using apache codec base64 library where I encrypted the string using SHA. (This can be ignored.)
Step 1 - I have printed a byte array for this string.
Step 2 - Encoded byte array and printed its value.
Step 3 - Decode the encoded value and print it.
public static void main(String[] args)
{
MessageDigest messageDigest = null;
String ALGORITHM = "SHA";
try
{
messageDigest = MessageDigest.getInstance(ALGORITHM);
byte[] arr = "admin1!".getBytes();
byte[] arr2 = messageDigest.digest(arr);
System.out.println(arr2);
String encoded = Base64.encodeBase64String(arr2);
System.out.println(encoded);
byte[] decoded = Base64.decodeBase64(encoded);
System.out.println(decoded);
}
catch (NoSuchAlgorithmException e)
{
e.printStackTrace();
}
}
Expected Result: Step 1 and Step 3 should give the same result. But I don’t get it.
Output:
[B @ 5ca801b0
90HMfRqqpfwRJge0anZat98BTdI =
[B @ 68d448a1
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Your program is nice and wonderful. Only one mistake.
System.out.println(byteArray);
prints the hashCode of the byte array object. ( Note: Arrays are objects in Java, not a primitive type)
You should use instead System.out.println(Arrays.toString(byteArray));
and you will get the same value for both steps 1 and 3.
By javadocs Arrays.toString(byte[] a)
returns a string representation of the contents of the specified array.
Your code after the changes will be:
public static void main(String[] args)
{
MessageDigest messageDigest = null;
String ALGORITHM = "SHA";
try
{
messageDigest = MessageDigest.getInstance(ALGORITHM);
byte[] arr = "admin1!".getBytes();
byte[] arr2 = messageDigest.digest(arr);
System.out.println(Arrays.toString(arr2));
String encoded = Base64.encodeBase64String(arr2);
System.out.println(encoded);
byte[] decoded = Base64.decodeBase64(encoded);
System.out.println(Arrays.toString(decoded));
}
catch (NoSuchAlgorithmException e)
{
e.printStackTrace();
}
}
and the output will be:
[- 9, 65, -52, 125, 26, -86, -91, -4, 17, 38, 7, -76, 106, 118, 90, -73, -33, 1, 77, -46]
90HMfRqqpfwRJge0anZat98BTdI =
[- 9, 65, -52, 125, 26, -86, -91, -4, 17, 38, 7, -76, 106, 118, 90, -73, -33, 1, 77, -46]
Note the meaning of the byte array is the same.
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