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package org.apache.catalina.util;
/**
* Encode a digest into a String.
* <p>
* The digest hash is converted into a character long String.
* Each character of the String is the hexadecimal representation of 4 bits
* of the digest.
*
* @author Remy Maucherat
* @version $Revision: 1.2 $ $Date: 2005/12/08 01:28:18 $
*/
class DigestEncoderBase {
// ----------------------------------------------------- Instance Variables
private static final char[] hexadecimal =
{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'a', 'b', 'c', 'd', 'e', 'f'};
// --------------------------------------------------------- Public Methods
/**
* Encodes the 8m bit (m bytes) MD5 into a 2m character String.
*
* @param binaryData Array containing the digest
* @return Encoded digest, or null if encoding failed
*/
public char[] encode( byte[] binaryData ) {
char[] buffer = new char[2 * binaryData.length];
for (int i=0; i < binaryData.length; i++) {
int low = (int) (binaryData[i] & 0x0f);
int high = (int) ((binaryData[i] & 0xf0) >> 4);
buffer[i*2] = hexadecimal[high];
buffer[i*2 + 1] = hexadecimal[low];
}
return buffer;
}
}