ChaCha20.php
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<?php
if (class_exists('ParagonIE_Sodium_Core32_ChaCha20', false)) {
return;
}
/**
* Class ParagonIE_Sodium_Core32_ChaCha20
*/
class ParagonIE_Sodium_Core32_ChaCha20 extends ParagonIE_Sodium_Core32_Util
{
/**
* The ChaCha20 quarter round function. Works on four 32-bit integers.
*
* @internal You should not use this directly from another application
*
* @param ParagonIE_Sodium_Core32_Int32 $a
* @param ParagonIE_Sodium_Core32_Int32 $b
* @param ParagonIE_Sodium_Core32_Int32 $c
* @param ParagonIE_Sodium_Core32_Int32 $d
* @return array<int, ParagonIE_Sodium_Core32_Int32>
* @throws SodiumException
* @throws TypeError
*/
protected static function quarterRound(
ParagonIE_Sodium_Core32_Int32 $a,
ParagonIE_Sodium_Core32_Int32 $b,
ParagonIE_Sodium_Core32_Int32 $c,
ParagonIE_Sodium_Core32_Int32 $d
) {
/** @var ParagonIE_Sodium_Core32_Int32 $a */
/** @var ParagonIE_Sodium_Core32_Int32 $b */
/** @var ParagonIE_Sodium_Core32_Int32 $c */
/** @var ParagonIE_Sodium_Core32_Int32 $d */
# a = PLUS(a,b); d = ROTATE(XOR(d,a),16);
$a = $a->addInt32($b);
$d = $d->xorInt32($a)->rotateLeft(16);
# c = PLUS(c,d); b = ROTATE(XOR(b,c),12);
$c = $c->addInt32($d);
$b = $b->xorInt32($c)->rotateLeft(12);
# a = PLUS(a,b); d = ROTATE(XOR(d,a), 8);
$a = $a->addInt32($b);
$d = $d->xorInt32($a)->rotateLeft(8);
# c = PLUS(c,d); b = ROTATE(XOR(b,c), 7);
$c = $c->addInt32($d);
$b = $b->xorInt32($c)->rotateLeft(7);
return array($a, $b, $c, $d);
}
/**
* @internal You should not use this directly from another application
*
* @param ParagonIE_Sodium_Core32_ChaCha20_Ctx $ctx
* @param string $message
*
* @return string
* @throws SodiumException
* @throws TypeError
*/
public static function encryptBytes(
ParagonIE_Sodium_Core32_ChaCha20_Ctx $ctx,
$message = ''
) {
$bytes = self::strlen($message);
/** @var ParagonIE_Sodium_Core32_Int32 $x0 */
/** @var ParagonIE_Sodium_Core32_Int32 $x1 */
/** @var ParagonIE_Sodium_Core32_Int32 $x2 */
/** @var ParagonIE_Sodium_Core32_Int32 $x3 */
/** @var ParagonIE_Sodium_Core32_Int32 $x4 */
/** @var ParagonIE_Sodium_Core32_Int32 $x5 */
/** @var ParagonIE_Sodium_Core32_Int32 $x6 */
/** @var ParagonIE_Sodium_Core32_Int32 $x7 */
/** @var ParagonIE_Sodium_Core32_Int32 $x8 */
/** @var ParagonIE_Sodium_Core32_Int32 $x9 */
/** @var ParagonIE_Sodium_Core32_Int32 $x10 */
/** @var ParagonIE_Sodium_Core32_Int32 $x11 */
/** @var ParagonIE_Sodium_Core32_Int32 $x12 */
/** @var ParagonIE_Sodium_Core32_Int32 $x13 */
/** @var ParagonIE_Sodium_Core32_Int32 $x14 */
/** @var ParagonIE_Sodium_Core32_Int32 $x15 */
/*
j0 = ctx->input[0];
j1 = ctx->input[1];
j2 = ctx->input[2];
j3 = ctx->input[3];
j4 = ctx->input[4];
j5 = ctx->input[5];
j6 = ctx->input[6];
j7 = ctx->input[7];
j8 = ctx->input[8];
j9 = ctx->input[9];
j10 = ctx->input[10];
j11 = ctx->input[11];
j12 = ctx->input[12];
j13 = ctx->input[13];
j14 = ctx->input[14];
j15 = ctx->input[15];
*/
/** @var ParagonIE_Sodium_Core32_Int32 $j0 */
$j0 = $ctx[0];
/** @var ParagonIE_Sodium_Core32_Int32 $j1 */
$j1 = $ctx[1];
/** @var ParagonIE_Sodium_Core32_Int32 $j2 */
$j2 = $ctx[2];
/** @var ParagonIE_Sodium_Core32_Int32 $j3 */
$j3 = $ctx[3];
/** @var ParagonIE_Sodium_Core32_Int32 $j4 */
$j4 = $ctx[4];
/** @var ParagonIE_Sodium_Core32_Int32 $j5 */
$j5 = $ctx[5];
/** @var ParagonIE_Sodium_Core32_Int32 $j6 */
$j6 = $ctx[6];
/** @var ParagonIE_Sodium_Core32_Int32 $j7 */
$j7 = $ctx[7];
/** @var ParagonIE_Sodium_Core32_Int32 $j8 */
$j8 = $ctx[8];
/** @var ParagonIE_Sodium_Core32_Int32 $j9 */
$j9 = $ctx[9];
/** @var ParagonIE_Sodium_Core32_Int32 $j10 */
$j10 = $ctx[10];
/** @var ParagonIE_Sodium_Core32_Int32 $j11 */
$j11 = $ctx[11];
/** @var ParagonIE_Sodium_Core32_Int32 $j12 */
$j12 = $ctx[12];
/** @var ParagonIE_Sodium_Core32_Int32 $j13 */
$j13 = $ctx[13];
/** @var ParagonIE_Sodium_Core32_Int32 $j14 */
$j14 = $ctx[14];
/** @var ParagonIE_Sodium_Core32_Int32 $j15 */
$j15 = $ctx[15];
$c = '';
for (;;) {
if ($bytes < 64) {
$message .= str_repeat("\x00", 64 - $bytes);
}
$x0 = clone $j0;
$x1 = clone $j1;
$x2 = clone $j2;
$x3 = clone $j3;
$x4 = clone $j4;
$x5 = clone $j5;
$x6 = clone $j6;
$x7 = clone $j7;
$x8 = clone $j8;
$x9 = clone $j9;
$x10 = clone $j10;
$x11 = clone $j11;
$x12 = clone $j12;
$x13 = clone $j13;
$x14 = clone $j14;
$x15 = clone $j15;
# for (i = 20; i > 0; i -= 2) {
for ($i = 20; $i > 0; $i -= 2) {
# QUARTERROUND( x0, x4, x8, x12)
list($x0, $x4, $x8, $x12) = self::quarterRound($x0, $x4, $x8, $x12);
# QUARTERROUND( x1, x5, x9, x13)
list($x1, $x5, $x9, $x13) = self::quarterRound($x1, $x5, $x9, $x13);
# QUARTERROUND( x2, x6, x10, x14)
list($x2, $x6, $x10, $x14) = self::quarterRound($x2, $x6, $x10, $x14);
# QUARTERROUND( x3, x7, x11, x15)
list($x3, $x7, $x11, $x15) = self::quarterRound($x3, $x7, $x11, $x15);
# QUARTERROUND( x0, x5, x10, x15)
list($x0, $x5, $x10, $x15) = self::quarterRound($x0, $x5, $x10, $x15);
# QUARTERROUND( x1, x6, x11, x12)
list($x1, $x6, $x11, $x12) = self::quarterRound($x1, $x6, $x11, $x12);
# QUARTERROUND( x2, x7, x8, x13)
list($x2, $x7, $x8, $x13) = self::quarterRound($x2, $x7, $x8, $x13);
# QUARTERROUND( x3, x4, x9, x14)
list($x3, $x4, $x9, $x14) = self::quarterRound($x3, $x4, $x9, $x14);
}
/*
x0 = PLUS(x0, j0);
x1 = PLUS(x1, j1);
x2 = PLUS(x2, j2);
x3 = PLUS(x3, j3);
x4 = PLUS(x4, j4);
x5 = PLUS(x5, j5);
x6 = PLUS(x6, j6);
x7 = PLUS(x7, j7);
x8 = PLUS(x8, j8);
x9 = PLUS(x9, j9);
x10 = PLUS(x10, j10);
x11 = PLUS(x11, j11);
x12 = PLUS(x12, j12);
x13 = PLUS(x13, j13);
x14 = PLUS(x14, j14);
x15 = PLUS(x15, j15);
*/
$x0 = $x0->addInt32($j0);
$x1 = $x1->addInt32($j1);
$x2 = $x2->addInt32($j2);
$x3 = $x3->addInt32($j3);
$x4 = $x4->addInt32($j4);
$x5 = $x5->addInt32($j5);
$x6 = $x6->addInt32($j6);
$x7 = $x7->addInt32($j7);
$x8 = $x8->addInt32($j8);
$x9 = $x9->addInt32($j9);
$x10 = $x10->addInt32($j10);
$x11 = $x11->addInt32($j11);
$x12 = $x12->addInt32($j12);
$x13 = $x13->addInt32($j13);
$x14 = $x14->addInt32($j14);
$x15 = $x15->addInt32($j15);
/*
x0 = XOR(x0, LOAD32_LE(m + 0));
x1 = XOR(x1, LOAD32_LE(m + 4));
x2 = XOR(x2, LOAD32_LE(m + 8));
x3 = XOR(x3, LOAD32_LE(m + 12));
x4 = XOR(x4, LOAD32_LE(m + 16));
x5 = XOR(x5, LOAD32_LE(m + 20));
x6 = XOR(x6, LOAD32_LE(m + 24));
x7 = XOR(x7, LOAD32_LE(m + 28));
x8 = XOR(x8, LOAD32_LE(m + 32));
x9 = XOR(x9, LOAD32_LE(m + 36));
x10 = XOR(x10, LOAD32_LE(m + 40));
x11 = XOR(x11, LOAD32_LE(m + 44));
x12 = XOR(x12, LOAD32_LE(m + 48));
x13 = XOR(x13, LOAD32_LE(m + 52));
x14 = XOR(x14, LOAD32_LE(m + 56));
x15 = XOR(x15, LOAD32_LE(m + 60));
*/
$x0 = $x0->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 0, 4)));
$x1 = $x1->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 4, 4)));
$x2 = $x2->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 8, 4)));
$x3 = $x3->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 12, 4)));
$x4 = $x4->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 16, 4)));
$x5 = $x5->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 20, 4)));
$x6 = $x6->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 24, 4)));
$x7 = $x7->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 28, 4)));
$x8 = $x8->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 32, 4)));
$x9 = $x9->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 36, 4)));
$x10 = $x10->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 40, 4)));
$x11 = $x11->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 44, 4)));
$x12 = $x12->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 48, 4)));
$x13 = $x13->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 52, 4)));
$x14 = $x14->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 56, 4)));
$x15 = $x15->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 60, 4)));
/*
j12 = PLUSONE(j12);
if (!j12) {
j13 = PLUSONE(j13);
}
*/
/** @var ParagonIE_Sodium_Core32_Int32 $j12 */
$j12 = $j12->addInt(1);
if ($j12->limbs[0] === 0 && $j12->limbs[1] === 0) {
$j13 = $j13->addInt(1);
}
/*
STORE32_LE(c + 0, x0);
STORE32_LE(c + 4, x1);
STORE32_LE(c + 8, x2);
STORE32_LE(c + 12, x3);
STORE32_LE(c + 16, x4);
STORE32_LE(c + 20, x5);
STORE32_LE(c + 24, x6);
STORE32_LE(c + 28, x7);
STORE32_LE(c + 32, x8);
STORE32_LE(c + 36, x9);
STORE32_LE(c + 40, x10);
STORE32_LE(c + 44, x11);
STORE32_LE(c + 48, x12);
STORE32_LE(c + 52, x13);
STORE32_LE(c + 56, x14);
STORE32_LE(c + 60, x15);
*/
$block = $x0->toReverseString() .
$x1->toReverseString() .
$x2->toReverseString() .
$x3->toReverseString() .
$x4->toReverseString() .
$x5->toReverseString() .
$x6->toReverseString() .
$x7->toReverseString() .
$x8->toReverseString() .
$x9->toReverseString() .
$x10->toReverseString() .
$x11->toReverseString() .
$x12->toReverseString() .
$x13->toReverseString() .
$x14->toReverseString() .
$x15->toReverseString();
/* Partial block */
if ($bytes < 64) {
$c .= self::substr($block, 0, $bytes);
break;
}
/* Full block */
$c .= $block;
$bytes -= 64;
if ($bytes <= 0) {
break;
}
$message = self::substr($message, 64);
}
/* end for(;;) loop */
$ctx[12] = $j12;
$ctx[13] = $j13;
return $c;
}
/**
* @internal You should not use this directly from another application
*
* @param int $len
* @param string $nonce
* @param string $key
* @return string
* @throws SodiumException
* @throws TypeError
*/
public static function stream($len = 64, $nonce = '', $key = '')
{
return self::encryptBytes(
new ParagonIE_Sodium_Core32_ChaCha20_Ctx($key, $nonce),
str_repeat("\x00", $len)
);
}
/**
* @internal You should not use this directly from another application
*
* @param int $len
* @param string $nonce
* @param string $key
* @return string
* @throws SodiumException
* @throws TypeError
*/
public static function ietfStream($len, $nonce = '', $key = '')
{
return self::encryptBytes(
new ParagonIE_Sodium_Core32_ChaCha20_IetfCtx($key, $nonce),
str_repeat("\x00", $len)
);
}
/**
* @internal You should not use this directly from another application
*
* @param string $message
* @param string $nonce
* @param string $key
* @param string $ic
* @return string
* @throws SodiumException
* @throws TypeError
*/
public static function ietfStreamXorIc($message, $nonce = '', $key = '', $ic = '')
{
return self::encryptBytes(
new ParagonIE_Sodium_Core32_ChaCha20_IetfCtx($key, $nonce, $ic),
$message
);
}
/**
* @internal You should not use this directly from another application
*
* @param string $message
* @param string $nonce
* @param string $key
* @param string $ic
* @return string
* @throws SodiumException
* @throws TypeError
*/
public static function streamXorIc($message, $nonce = '', $key = '', $ic = '')
{
return self::encryptBytes(
new ParagonIE_Sodium_Core32_ChaCha20_Ctx($key, $nonce, $ic),
$message
);
}
}