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How to create a SHA1, base64 encoding password in java?

Posted on 2008-10-13
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Last Modified: 2008-10-23
I am trying to create a password that is first converted to uppercase, then Unicode it in little-endian UTF16,
then SHA1 it, then base64 encode it.  I will be displaying the password as a string.

Currently, I am getting output that looks like I have done it correctly, but am still unable to connect via https and it returns an invalid username/password..  So, I wanted to ensure my password encryption was correct.  I know Java doesn't support base64 encoding in the standard API, but found a routine that is suppose to do the trick.  See the attached code and let me know if this is correct.




static final String baseTable = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
 
// encrypt password
            String sPassword = "AVI5580!";
            byte[] unicodeValue = sPassword.getBytes( "utf-16" );
            md = MessageDigest.getInstance( "SHA1" );
            md.update( unicodeValue );
            byte[] encodedPassword = md.digest();
            String encodedString = encode( encodedPassword );
 
 
// encode method
 public static String encode( byte[] bytes )
    {
        StringBuffer tmp = new StringBuffer();
        int i = 0;
        byte pos;
        for (i = 0; i < bytes.length - bytes.length % 3; i += 3) {
            pos = (byte) (bytes[i] >> 2 & 63);
            tmp.append( baseTable.charAt( pos ) );
            pos = (byte) (((bytes[i] & 3) << 4) + (bytes[i + 1] >> 4 & 15));
            tmp.append( baseTable.charAt( pos ) );
            pos = (byte) (((bytes[i + 1] & 15) << 2) + (bytes[i + 2] >> 6 & 3));
            tmp.append( baseTable.charAt( pos ) );
            pos = (byte) (bytes[i + 2] & 63);
            tmp.append( baseTable.charAt( pos ) );
            // Add a new line for each 76 chars.
            // 76*3/4 = 57
            if ((i + 2) % 56 == 0) {
                tmp.append( "\r\n" );
            }
        }
        if (bytes.length % 3 != 0) {
            if (bytes.length % 3 == 2) {
                pos = (byte) (bytes[i] >> 2 & 63);
                tmp.append( baseTable.charAt( pos ) );
                pos = (byte) (((bytes[i] & 3) << 4) + (bytes[i + 1] >> 4 & 15));
                tmp.append( baseTable.charAt( pos ) );
                pos = (byte) ((bytes[i + 1] & 15) << 2);
                tmp.append( baseTable.charAt( pos ) );
                tmp.append( "=" );
            } else if (bytes.length % 3 == 1) {
                pos = (byte) (bytes[i] >> 2 & 63);
                tmp.append( baseTable.charAt( pos ) );
                pos = (byte) ((bytes[i] & 3) << 4);
                tmp.append( baseTable.charAt( pos ) );
                tmp.append( "==" );
            }
        }
        return tmp.toString();
    }

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Question by:cindymccartney
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1 Comment
 
LVL 23

Accepted Solution

by:
Ajay-Singh earned 2000 total points
ID: 22722684
You can use commons-codec library to encode it http://commons.apache.org/codec
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