MessageDigest SHA-512 different than openssl

Question

I can't figure out what I'm doing wrong here. I have the following code:

byte[] digest = new byte[0];
MessageDigest md = null;
try{
    md = MessageDigest.getInstance( "SHA-512" );
}
catch( NoSuchAlgorithmException e ) {
    return digest;
}
digest = md.digest( myString.getBytes() );

Looking at the hex values of digest byte[] in the NetBeans debugger, it shows something different than the output of:

echo "myString" | openssl dgst -sha512

I'm guessing it's a character encoding issue, but doesn't the JVM and openssl use the default character set for the machine?

Any help is appreciated.

Character encodings shouldn't be an issue for `"myString"`, since that's pure ASCII. But you might want to examine the return value of `myString.getBytes()` just to make sure. — David Z, Jun 26 '10 at 18:17

score 8 · Accepted Answer · answered Jun 26 '10 at 18:25

8

echo appends a newline at the end -

[steven@emu:~]% echo "myString" | hexdump -C
00000000  6d 79 53 74 72 69 6e 67  0a                       |myString.|

Try echo -n?

answered Jun 26 '10 at 18:25

Steven Schlansker

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2

That was it! You are a bash ninja! Thank you. – Tim Jun 26 '10 at 18:30
That has tripped me up before too! – jpswain Mar 08 '11 at 21:32

MessageDigest SHA-512 different than openssl

1 Answers1