# Using jce1_2-do.jar

Mark D. Baushke (mark.baushke@solipsa.com)
Tue, 20 Jul 1999 22:52:12 -0700

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    Message-Id: <199907210552.WAA25163@mdb-linux.solipsa.com>

    To: java-security@java.sun.com

    From: "Mark D. Baushke" <mark.baushke@solipsa.com>

    Subject: Using jce1_2-do.jar

    Date: Tue, 20 Jul 1999 22:52:12 -0700

Greetings,

I tried to find something relevant on the
http://java.sun.com/cgi-bin/bugreport.cgi
page for reporting this problem, but I was unable to find anything
related to jce at all, so I am sending my question via e-mail to you
directly. If this is not the correct place, please let me know how to
proceed.

Problem statement:

I need to be able to generate a simple MD5 hash of the same
arbitrary text in both java and perl and get the same result.

Version information:

For perl, I am using perl 5.005_03 with MD5-1.7 from the CPAN archive.
For java, I am using jdk1.2 java and jce1_2-do.jar from your site.
(http://java.sun.com/products/jce/)

For the tests show below, I was running on intel hardware with a
RedHat Linux 6.0 operating system. My perl test gives the same
answer on both Sparc and Intel hardware.

Reproducing the test:

% unshar < path-to-this-message
% perl HmacMD5Test.perl 'Hi There'
data = "Hi There"
digest = 5b49b515f3173e4540b7d39bb57a4482
% javac -g HmacMD5Test.java
% java HmacMD5Test 'Hi There'
key = javax.crypto.spec.SecretKeySpec@c2f22036
data = "Hi There"
digest = 72c33c78cac0b7a581ac263a344ed01d
% echo -n 'Hi There' | md5
5b49b515f3173e4540b7d39bb57a4482
%

Analysis:

As you can see, I do not get the same digest result. I am hoping that
this is a bit of pilot error on my part and that you will be able to
tell me what I need to do to get things to work.

If you have any suggestions for how to modify the way I use the
javax.crypto.Mac class so that I get the desired result, please let me
know.

Thanks,
-- Mark

PS: The md5 program used in the test above is from 'fingerprint'
utility posted to the net some years ago.

#!/bin/sh
# This is a shell archive (produced by GNU sharutils 4.2).
# To extract the files from this archive, save it to some FILE, remove
# everything before the `!/bin/sh' line above, then type `sh FILE'.
#
# Made on 1999-07-20 22:28 PDT by <mark.baushke@solipsa.com>.
# Source directory was `/tmp'.
#
# Existing files will *not* be overwritten unless `-c' is specified.
#
# This shar contains:
# length mode name
# ------ ---------- ------------------------------------------
# 1920 -rw-r--r-- HmacMD5Test.java
# 178 -rwxr-xr-x HmacMD5Test.perl
#
save_IFS="${IFS}"
IFS="${IFS}:"
gettext_dir=FAILED
locale_dir=FAILED
first_param="$1"
for dir in $PATH
do
if test "$gettext_dir" = FAILED && test -f $dir/gettext \
&& ($dir/gettext --version >/dev/null 2>&1)
then
set `$dir/gettext --version 2>&1`
if test "$3" = GNU
then
gettext_dir=$dir
fi
fi
if test "$locale_dir" = FAILED && test -f $dir/shar \
&& ($dir/shar --print-text-domain-dir >/dev/null 2>&1)
then
locale_dir=`$dir/shar --print-text-domain-dir`
fi
done
IFS="$save_IFS"
if test "$locale_dir" = FAILED || test "$gettext_dir" = FAILED
then
echo=echo
else
TEXTDOMAINDIR=$locale_dir
export TEXTDOMAINDIR
TEXTDOMAIN=sharutils
export TEXTDOMAIN
echo="$gettext_dir/gettext -s"
fi
touch -am 1231235999 $$.touch >/dev/null 2>&1
if test ! -f 1231235999 && test -f $$.touch; then
shar_touch=touch
else
shar_touch=:
echo
$echo 'WARNING: not restoring timestamps. Consider getting and'
$echo "installing GNU \`touch', distributed in GNU File Utilities..."
echo
fi
rm -f 1231235999 $$.touch
#
if mkdir _sh25060; then
$echo 'x -' 'creating lock directory'
else
$echo 'failed to create lock directory'
exit 1
fi
# ============= HmacMD5Test.java ==============
if test -f 'HmacMD5Test.java' && test "$first_param" != -c; then
$echo 'x -' SKIPPING 'HmacMD5Test.java' '(file already exists)'
else
$echo 'x -' extracting 'HmacMD5Test.java' '(text)'
sed 's/^X//' << 'SHAR_EOF' > 'HmacMD5Test.java' &&
/*
X *------------------------------------------------------------------
X * HmacMD5Test -- a trivial test of an Hmac-MD5
X *
X * July 1999, Mark D. Baushke
X *
X * Copyright (c) 1999 by Solipsa Corporation
X * All rights reserved.
X *------------------------------------------------------------------
X */
X
import java.io.*;
import javax.crypto.*;
import java.security.*;
X
public class HmacMD5Test {
X public static void main(String[] args) {
X Mac mac;
X
X try {
X // Install SunJCE provider
X Provider sunJce = new com.sun.crypto.provider.SunJCE();
X Security.addProvider(sunJce);
X // Generate secret key for HMAC-MD5
X KeyGenerator kg = KeyGenerator.getInstance("HmacMD5");
X SecretKey sk = kg.generateKey();
X mac = Mac.getInstance("HmacMD5");
X
X /*
X * Now go ahead and process the command line args using
X * each one as data to generate a digest.
X */
X for (int i = 0; i < args.length; i++) { // Command-line args
X mac.init(sk);
X byte[] mydigest = mac.doFinal(args[i].getBytes());
X System.out.println("key = " + sk);
X System.out.println("data = \"" + args[i] + "\"");
X System.out.println("digest = " + toHexString(mydigest));
X }
X }
X catch (Exception e) {
X System.out.println(e);
X System.exit(1);
X }
X }
X
X /*
X * Converts a byte to hex digit and writes to the supplied buffer
X */
X static private void byte2hex(byte b, StringBuffer buf) {
X char[] hexChars = { '0', '1', '2', '3', '4', '5', '6', '7', '8',
X '9', 'a', 'b', 'c', 'd', 'e', 'f' };
X int high = ((b & 0xf0) >> 4);
X int low = (b & 0x0f);
X buf.append(hexChars[high]);
X buf.append(hexChars[low]);
X }
X
X /*
X * Converts a byte array to hex string
X */
X static private String toHexString(byte[] block) {
X StringBuffer buf = new StringBuffer();
X
X int len = block.length;
X
X for (int i = 0; i < len; i++) {
X byte2hex(block[i], buf);
X }
X return buf.toString();
X }
}
SHAR_EOF
$shar_touch -am 0720222199 'HmacMD5Test.java' &&
chmod 0644 'HmacMD5Test.java' ||
$echo 'restore of' 'HmacMD5Test.java' 'failed'
if ( md5sum --help 2>&1 | grep 'sage: md5sum \[' ) >/dev/null 2>&1 \
&& ( md5sum --version 2>&1 | grep -v 'textutils 1.12' ) >/dev/null; then
md5sum -c << SHAR_EOF >/dev/null 2>&1 \
|| $echo 'HmacMD5Test.java:' 'MD5 check failed'
2d94324a601520f9f9409ccdc7579ebc HmacMD5Test.java
SHAR_EOF
else
shar_count="`LC_ALL= LC_CTYPE= LANG= wc -c < 'HmacMD5Test.java'`"
test 1920 -eq "$shar_count" ||
$echo 'HmacMD5Test.java:' 'original size' '1920,' 'current size' "$shar_count!"
fi
fi
# ============= HmacMD5Test.perl ==============
if test -f 'HmacMD5Test.perl' && test "$first_param" != -c; then
$echo 'x -' SKIPPING 'HmacMD5Test.perl' '(file already exists)'
else
$echo 'x -' extracting 'HmacMD5Test.perl' '(text)'
sed 's/^X//' << 'SHAR_EOF' > 'HmacMD5Test.perl' &&
#!/usr/bin/perl
X
use Digest::MD5 qw(md5_hex);
X
foreach $arg (@ARGV) {
X $mydigest = md5_hex($arg);
X print('data = "', $arg, '"', "\n",
X 'digest = ', $mydigest, "\n");
}
SHAR_EOF
$shar_touch -am 0720222799 'HmacMD5Test.perl' &&
chmod 0755 'HmacMD5Test.perl' ||
$echo 'restore of' 'HmacMD5Test.perl' 'failed'
if ( md5sum --help 2>&1 | grep 'sage: md5sum \[' ) >/dev/null 2>&1 \
&& ( md5sum --version 2>&1 | grep -v 'textutils 1.12' ) >/dev/null; then
md5sum -c << SHAR_EOF >/dev/null 2>&1 \
|| $echo 'HmacMD5Test.perl:' 'MD5 check failed'
48783e53f1c0192b68bbbca20efb4471 HmacMD5Test.perl
SHAR_EOF
else
shar_count="`LC_ALL= LC_CTYPE= LANG= wc -c < 'HmacMD5Test.perl'`"
test 178 -eq "$shar_count" ||
$echo 'HmacMD5Test.perl:' 'original size' '178,' 'current size' "$shar_count!"
fi
fi
rm -fr _sh25060
exit 0

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- Next in thread: Sharon Liu: "Re: Using jce1_2-do.jar"