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-rw-r--r--src/Encoding.php228
1 files changed, 227 insertions, 1 deletions
diff --git a/src/Encoding.php b/src/Encoding.php
index 81983c2..5a5f648 100644
--- a/src/Encoding.php
+++ b/src/Encoding.php
@@ -25,11 +25,204 @@ namespace ParagonIE\ConstantTime;
class Encoding
{
/**
+ * Decode a Base32-encoded string into raw binary
+ *
+ * @param string $src
+ * @return string
+ */
+ public static function base32Decode($src)
+ {
+ // Remove padding
+ $srcLen = self::safeStrlen($src);
+ if ($srcLen === 0) {
+ return '';
+ }
+ if (($srcLen & 7) === 0) {
+ if ($src[$srcLen - 1] === '=') {
+ $srcLen--;
+ if ($src[$srcLen - 1] === '=') {
+ $srcLen--;
+ }
+ if ($src[$srcLen - 1] === '=') {
+ $srcLen--;
+ }
+ if ($src[$srcLen - 1] === '=') {
+ $srcLen--;
+ }
+ if ($src[$srcLen - 1] === '=') {
+ $srcLen--;
+ }
+ if ($src[$srcLen - 1] === '=') {
+ $srcLen--;
+ }
+ if ($src[$srcLen - 1] === '=') {
+ $srcLen--;
+ }
+ }
+ }
+ if (($srcLen & 7) === 1) {
+ return false;
+ }
+
+ $err = 0;
+ $dest = '';
+ for ($i = 0; $i + 8 <= $srcLen; $i += 8) {
+ $c0 = self::base32Decode5Bits(ord($src[$i]));
+ $c1 = self::base32Decode5Bits(ord($src[$i + 1]));
+ $c2 = self::base32Decode5Bits(ord($src[$i + 2]));
+ $c3 = self::base32Decode5Bits(ord($src[$i + 3]));
+ $c4 = self::base32Decode5Bits(ord($src[$i + 4]));
+ $c5 = self::base32Decode5Bits(ord($src[$i + 5]));
+ $c6 = self::base32Decode5Bits(ord($src[$i + 6]));
+ $c7 = self::base32Decode5Bits(ord($src[$i + 7]));
+
+ $dest .=
+ chr((($c0 << 3) | ($c1 >> 2) ) & 0xff) .
+ chr((($c1 << 6) | ($c2 << 1) | ($c3 >> 4)) & 0xff) .
+ chr((($c3 << 4) | ($c4 >> 1) ) & 0xff) .
+ chr((($c4 << 7) | ($c5 << 2) | ($c6 >> 3)) & 0xff) .
+ chr((($c6 << 5) | ($c7 ) ) & 0xff);
+ }
+ if ($i < $srcLen) {
+ $c0 = self::base32Decode5Bits(ord($src[$i]));
+ if ($i + 6 < $srcLen) {
+ $c1 = self::base32Decode5Bits(ord($src[$i + 1]));
+ $c2 = self::base32Decode5Bits(ord($src[$i + 2]));
+ $c3 = self::base32Decode5Bits(ord($src[$i + 3]));
+ $c4 = self::base32Decode5Bits(ord($src[$i + 4]));
+ $c5 = self::base32Decode5Bits(ord($src[$i + 5]));
+ $c6 = self::base32Decode5Bits(ord($src[$i + 6]));
+
+ $dest .=
+ chr((($c0 << 3) | ($c1 >> 2) ) & 0xff) .
+ chr((($c1 << 6) | ($c2 << 1) | ($c3 >> 4)) & 0xff) .
+ chr((($c3 << 4) | ($c4 >> 1) ) & 0xff) .
+ chr((($c4 << 7) | ($c5 << 2) | ($c6 >> 3)) & 0xff);
+ } elseif ($i + 5 < $srcLen) {
+ $c1 = self::base32Decode5Bits(ord($src[$i + 1]));
+ $c2 = self::base32Decode5Bits(ord($src[$i + 2]));
+ $c3 = self::base32Decode5Bits(ord($src[$i + 3]));
+ $c4 = self::base32Decode5Bits(ord($src[$i + 4]));
+ $c5 = self::base32Decode5Bits(ord($src[$i + 5]));
+
+ $dest .=
+ chr((($c0 << 3) | ($c1 >> 2) ) & 0xff) .
+ chr((($c1 << 6) | ($c2 << 1) | ($c3 >> 4)) & 0xff) .
+ chr((($c3 << 4) | ($c4 >> 1) ) & 0xff) .
+ chr((($c4 << 7) | ($c5 << 2) ) & 0xff);
+ } elseif ($i + 4 < $srcLen) {
+ $c1 = self::base32Decode5Bits(ord($src[$i + 1]));
+ $c2 = self::base32Decode5Bits(ord($src[$i + 2]));
+ $c3 = self::base32Decode5Bits(ord($src[$i + 3]));
+ $c4 = self::base32Decode5Bits(ord($src[$i + 4]));
+
+ $dest .=
+ chr((($c0 << 3) | ($c1 >> 2) ) & 0xff) .
+ chr((($c1 << 6) | ($c2 << 1) | ($c3 >> 4)) & 0xff) .
+ chr((($c3 << 4) | ($c4 >> 1) ) & 0xff);
+ } elseif ($i + 3 < $srcLen) {
+ $c1 = self::base32Decode5Bits(ord($src[$i + 1]));
+ $c2 = self::base32Decode5Bits(ord($src[$i + 2]));
+ $c3 = self::base32Decode5Bits(ord($src[$i + 3]));
+
+ $dest .=
+ chr((($c0 << 3) | ($c1 >> 2) ) & 0xff) .
+ chr((($c1 << 6) | ($c2 << 1) | ($c3 >> 4)) & 0xff) .
+ ''; //chr((($c3 << 4) ) & 0xff);
+ } elseif ($i + 2 < $srcLen) {
+ $c1 = self::base32Decode5Bits(ord($src[$i + 1]));
+ $c2 = self::base32Decode5Bits(ord($src[$i + 2]));
+
+ $dest .=
+ chr((($c0 << 3) | ($c1 >> 2) ) & 0xff) .
+ chr((($c1 << 6) | ($c2 << 1) ) & 0xff);
+ } elseif ($i + 1 < $srcLen) {
+ $c1 = self::base32Decode5Bits(ord($src[$i + 1]));
+ $dest .=
+ chr((($c0 << 3) | ($c1 >> 2) ) & 0xff);
+ } else {
+ $dest .=
+ chr((($c0 << 3) ) & 0xff);
+ }
+ }
+ return $dest;
+ }
+
+ /**
+ * Encode into Base32 (RFC 4648)
+ *
+ * @param string $src
+ * @return string
+ */
+ public static function base32Encode($src)
+ {
+ $dest = '';
+ $srcLen = self::safeStrlen($src);
+ for ($i = 0; $i + 5 <= $srcLen; $i += 5) {
+ $b0 = ord($src[$i]);
+ $b1 = ord($src[$i + 1]);
+ $b2 = ord($src[$i + 2]);
+ $b3 = ord($src[$i + 3]);
+ $b4 = ord($src[$i + 4]);
+ $dest .=
+ self::base32Encode5Bits( ($b0 >> 3) & 31) .
+ self::base32Encode5Bits((($b0 << 2) | ($b1 >> 6)) & 31) .
+ self::base32Encode5Bits((($b1 >> 1) ) & 31) .
+ self::base32Encode5Bits((($b1 << 4) | ($b2 >> 4)) & 31) .
+ self::base32Encode5Bits((($b2 << 1) | ($b3 >> 7)) & 31) .
+ self::base32Encode5Bits((($b3 >> 2) ) & 31) .
+ self::base32Encode5Bits((($b3 << 3) | ($b4 >> 5)) & 31) .
+ self::base32Encode5Bits( $b4 & 31);
+ }
+ if ($i < $srcLen) {
+ $b0 = ord($src[$i]);
+ if ($i + 3 < $srcLen) {
+ $b1 = ord($src[$i + 1]);
+ $b2 = ord($src[$i + 2]);
+ $b3 = ord($src[$i + 3]);
+ $dest .=
+ self::base32Encode5Bits( ($b0 >> 3) & 31) .
+ self::base32Encode5Bits((($b0 << 2) | ($b1 >> 6)) & 31) .
+ self::base32Encode5Bits((($b1 >> 1) ) & 31) .
+ self::base32Encode5Bits((($b1 << 4) | ($b2 >> 4)) & 31) .
+ self::base32Encode5Bits((($b2 << 1) | ($b3 >> 7)) & 31) .
+ self::base32Encode5Bits((($b3 >> 2) ) & 31) .
+ self::base32Encode5Bits((($b3 << 3) ) & 31) .
+ '=';
+ } elseif ($i + 2 < $srcLen) {
+ $b1 = ord($src[$i + 1]);
+ $b2 = ord($src[$i + 2]);
+ $dest .=
+ self::base32Encode5Bits( ($b0 >> 3) & 31) .
+ self::base32Encode5Bits((($b0 << 2) | ($b1 >> 6)) & 31) .
+ self::base32Encode5Bits((($b1 >> 1) ) & 31) .
+ self::base32Encode5Bits((($b1 << 4) | ($b2 >> 4)) & 31) .
+ self::base32Encode5Bits((($b2 << 1) ) & 31) .
+ '===';
+ } elseif ($i + 1 < $srcLen) {
+ $b1 = ord($src[$i + 1]);
+ $dest .=
+ self::base32Encode5Bits( ($b0 >> 3) & 31) .
+ self::base32Encode5Bits((($b0 << 2) | ($b1 >> 6)) & 31) .
+ self::base32Encode5Bits((($b1 >> 1) ) & 31) .
+ self::base32Encode5Bits((($b1 << 4) ) & 31) .
+ '====';
+ } else {
+ $dest .=
+ self::base32Encode5Bits( ($b0 >> 3) & 31) .
+ self::base32Encode5Bits( ($b0 << 2) & 31) .
+ '======';
+ }
+ }
+ return $dest;
+ }
+
+ /**
* Encode into Base64
*
* Base64 character set "[A-Z][a-z][0-9]+/"
*
- * @param $src
+ * @param string $src
* @return string
*/
public static function base64Encode($src)
@@ -366,6 +559,7 @@ class Encoding
{
$hex_pos = 0;
$bin = '';
+ $c_acc = 0;
$hex_len = self::safeStrlen($hex_string);
$state = 0;
@@ -394,6 +588,38 @@ class Encoding
/**
*
+ * @param $src
+ * @return int
+ */
+ protected static function base32Decode5Bits($src)
+ {
+ $ret = -1;
+
+ // if ($src > 64 && $src < 91) $ret += $src - 65 + 1; // -64
+ $ret += (((0x40 - $src) & ($src - 0x5b)) >> 8) & ($src - 64);
+
+ // if ($src > 0x31 && $src < 0x38) $ret += $src - 24 + 1; // -23
+ $ret += (((0x31 - $src) & ($src - 0x38)) >> 8) & ($src - 23);
+
+ return $ret;
+ }
+
+ /**
+ * @param $src
+ * @return string
+ */
+ protected static function base32Encode5Bits($src)
+ {
+ $diff = 0x41;
+
+ // if ($src > 25) $ret -= 40;
+ $diff -= ((25 - $src) >> 8) & 41;
+
+ return chr($src + $diff);
+ }
+
+ /**
+ *
* Base64 character set:
* [A-Z] [a-z] [0-9] + /
* 0x41-0x5a, 0x61-0x7a, 0x30-0x39, 0x2b, 0x2f
generated by cgit v1.1 at 2025-06-05 20:16:48 +0000