Corrupt openssl encrypted file when decrypted in nodeJS

I have a mysql dump file which is Gzipped and then encrypted in OpenSSL.

openssl enc -aes-256-cbc -e -in input.gz -out output.gz.enc -pass pass:"some_pass_phrase"

when I try to decrypt it using NodeJS I get a corrupt file that I cannot unzip.

function decryptBackupFile() {
    var enc_key = GetEnvironmentVariable("ENC_KEY");
    var input = fs.createReadStream('/Users/afiku/Documents/input.sql.gz.enc');
    var output = fs.createWriteStream('/Users/afiku/Documents/output.sql.gz');

    var decrypt = crypto.createDecipher('aes-256-cbc', enc_key);
    decrypt.setAutoPadding(false);

    input.pipe(decrypt).pipe(output);
    output.on('finish', function(){
        console.log('Finished unarchiving');   
    });
}

I didn't get any error or exception and the resulting file is a bit smaller than the encrypted file.

the passphrase is correct. I tried decrypting it using openssl in bash and it worked...

what am I doing wrong?

via Afiku