CODEWITHSUNDEEP
javasqlstringpasswordsmd5
Ardel
Ardel

Reputation: 165

What am I doing wrong when trying to convert string to MD5

I am working on a login frame that checks user input password against the password in a SQL database. I convert the text into an MD5 to store in the database with the following

HASHBYTES('MD5', 'JavaTest') And that produces 5E58D71FBD6D17577AAAB8711264A813.

Then in java I use the following code to attempt to convert the same password "JavaTest" into MD5 to compare against. 

MessageDigest m = MessageDigest.getInstance("MD5");
            m.update(password.getBytes());
            byte[] digest = m.digest();
            BigInteger bigInt = new BigInteger(1, digest);
            hashText = bigInt.toString();

But that produces the string 150157350912923000195076232128194914284

What am I doing wrong?

EDIT: I do not believe this is a duplicate because I have researched answers and it has gotten me this far but I can not figure out what I am doing wrong.

Upvotes: 0

Views: 485

Answers (1)

Vyacheslav Gerasimov
Vyacheslav Gerasimov

Reputation: 1354

Just pass radix parameter to bigInt.toString. If you need hex representation pass 16 as radix like this:

hashText = bigInt.toString(16);

public String toString(int radix)

Returns the String representation of this BigInteger in the given radix. If the radix is outside the range from Character.MIN_RADIX to Character.MAX_RADIX inclusive, it will default to 10 (as is the case for Integer.toString). The digit-to-character mapping provided by Character.forDigit is used, and a minus sign is prepended if appropriate. (This representation is compatible with the (String, int) constructor.)

Parameters:

radix - radix of the String representation. Returns: String representation of this BigInteger in the given radix.

Also, you can build hex string form digest byte array without BigInteger like this:

public static String bytesToHex(byte[] bytes) {
    StringBuilder builder = new StringBuilder();
    for(byte b : bytes) {
        builder.append(String.format("%02x", b));
    }
    return builder.toString();
}

Upvotes: 1

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