<?php
use ParagonIE\SeedSpring\SeedSpring;
use ParagonIE\ConstantTime\Hex;
class SeedSpringTest extends PHPUnit_Framework_TestCase
{
public function testDeterminism()
{
$seed = random_bytes(16);
$rnd1 = new SeedSpring($seed);
$rnd2 = new SeedSpring($seed);
$out1 = $rnd1->getBytes(16);
$out2 = $rnd1->getBytes(16);
$out3 = $rnd2->getBytes(32);
$this->assertEquals(
$out1 . $out2,
$out3
);
$int1 = $rnd1->getInt(0, 255);
$int2 = $rnd2->getInt(0, 255);
$this->assertEquals(
$int1,
$int2
);
}
/**
* Our nonce logic needs to match OpenSSL's internals.
*/
public function testCtrModeNonce()
{
$seed = random_bytes(16);
$rnd1 = new SeedSpring($seed);
$rnd2 = new SeedSpring($seed);
foreach ([4096, 4097, 8192, 16384, 65536] as $test) {
$buf1 = '';
for ($i = 0; $i < $test; $i += 16) {
$buf1 .= $rnd1->getBytes(
$i + 16 > $test
? ($test - $i)
: 16
);
}
$buf2 = $rnd2->getBytes($test);
$this->assertSame(
\ParagonIE\ConstantTime\Binary::safeStrlen($buf1),
\ParagonIE\ConstantTime\Binary::safeStrlen($buf2),
'Not the same length - test ' . $test
);
$this->assertSame(
Hex::encode(\ParagonIE\ConstantTime\Binary::safeSubstr($buf1, 0, 16)),
Hex::encode(\ParagonIE\ConstantTime\Binary::safeSubstr($buf2, 0, 16)),
'AES CTR nonce isn\'t correct - first 16 - test ' . $test
);
$this->assertSame(
bin2hex(substr($buf1, 16, 16)),
bin2hex(substr($buf2, 16, 16)),
'AES CTR nonce isn\'t correct - next 16 - test ' . $test
);
$this->assertSame(
bin2hex(substr($buf1, -16, 16)),
bin2hex(substr($buf2, -16, 16)),
'AES CTR nonce isn\'t correct - last 16 - test ' . $test
);
}
}
public function testNonceChanges()
{
$prng = new SeedSpring('JuxJ1XLnBKk7gPAS');
$this->assertSame(
'v',
$prng->getBytes(1)
);
$this->assertNotSame(
'v',
$prng->getBytes(1)
);
}
}
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