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Pure-PHP implementation of ChaCha20. PHP version 5
| Author: | Jim Wigginton |
| Copyright: | 2019 Jim Wigginton |
| License: | http://www.opensource.org/licenses/mit-license.html MIT License |
| Link: | http://phpseclib.sourceforge.net |
| File Size: | 799 lines (37 kb) |
| Included or required: | 0 times |
| Referenced: | 0 times |
| Includes or requires: | 0 files |
ChaCha20:: (10 methods):
isValidEngineHelper()
encrypt()
decrypt()
encrypt_with_libsodium()
decrypt_with_libsodium()
setNonce()
setup()
quarterRound()
doubleRound()
salsa20()
| isValidEngineHelper($engine) X-Ref |
| Test for engine validity This is mainly just a wrapper to set things up for \phpseclib3\Crypt\Common\SymmetricKey::isValidEngine() see: \phpseclib3\Crypt\Common\SymmetricKey::__construct() return: bool param: int $engine |
| encrypt($plaintext) X-Ref |
| Encrypts a message. see: \phpseclib3\Crypt\Common\SymmetricKey::decrypt() see: self::crypt() return: string $ciphertext param: string $plaintext |
| decrypt($ciphertext) X-Ref |
| Decrypts a message. $this->decrypt($this->encrypt($plaintext)) == $this->encrypt($this->encrypt($plaintext)). At least if the continuous buffer is disabled. see: \phpseclib3\Crypt\Common\SymmetricKey::encrypt() see: self::crypt() return: string $plaintext param: string $ciphertext |
| encrypt_with_libsodium($plaintext) X-Ref |
| Encrypts a message with libsodium see: self::encrypt() return: string $text param: string $plaintext |
| decrypt_with_libsodium($ciphertext) X-Ref |
| Decrypts a message with libsodium see: self::decrypt() return: string $text param: string $ciphertext |
| setNonce($nonce) X-Ref |
| Sets the nonce. param: string $nonce |
| setup() X-Ref |
| Setup the self::ENGINE_INTERNAL $engine (re)init, if necessary, the internal cipher $engine _setup() will be called each time if $changed === true typically this happens when using one or more of following public methods: - setKey() - setNonce() - First run of encrypt() / decrypt() with no init-settings see: self::setKey() see: self::setNonce() see: self::disableContinuousBuffer() |
| quarterRound(&$a, &$b, &$c, &$d) X-Ref |
| The quarterround function param: int $a param: int $b param: int $c param: int $d |
| doubleRound(&$x0, &$x1, &$x2, &$x3, &$x4, &$x5, &$x6, &$x7, &$x8, &$x9, &$x10, &$x11, &$x12, &$x13, &$x14, &$x15) X-Ref |
| The doubleround function param: int $x0 (by reference) param: int $x1 (by reference) param: int $x2 (by reference) param: int $x3 (by reference) param: int $x4 (by reference) param: int $x5 (by reference) param: int $x6 (by reference) param: int $x7 (by reference) param: int $x8 (by reference) param: int $x9 (by reference) param: int $x10 (by reference) param: int $x11 (by reference) param: int $x12 (by reference) param: int $x13 (by reference) param: int $x14 (by reference) param: int $x15 (by reference) |
| salsa20($x) X-Ref |
| The Salsa20 hash function function On my laptop this loop unrolled / function dereferenced version of parent::salsa20 encrypts 1mb of text in 0.65s vs the 0.85s that it takes with the parent method. If we were free to assume that the host OS would always be 64-bits then the if condition in leftRotate could be eliminated and we could knock this done to 0.60s. For comparison purposes, RC4 takes 0.16s and AES in CTR mode with the Eval engine takes 0.48s. AES in CTR mode with the PHP engine takes 1.19s. Salsa20 / ChaCha20 do not benefit as much from the Eval approach due to the fact that there are a lot less variables to de-reference, fewer loops to unroll, etc param: string $x |