ParagonIE_Sodium_Crypto

15abstract class ParagonIE_Sodium_Crypto16{17    const aead_chacha20poly1305_KEYBYTES = 32;18    const aead_chacha20poly1305_NSECBYTES = 0;19    const aead_chacha20poly1305_NPUBBYTES = 8;20    const aead_chacha20poly1305_ABYTES = 16;21 22    const aead_chacha20poly1305_IETF_KEYBYTES = 32;23    const aead_chacha20poly1305_IETF_NSECBYTES = 0;24    const aead_chacha20poly1305_IETF_NPUBBYTES = 12;25    const aead_chacha20poly1305_IETF_ABYTES = 16;26 27    const aead_xchacha20poly1305_IETF_KEYBYTES = 32;28    const aead_xchacha20poly1305_IETF_NSECBYTES = 0;29    const aead_xchacha20poly1305_IETF_NPUBBYTES = 24;30    const aead_xchacha20poly1305_IETF_ABYTES = 16;31 32    const box_curve25519xsalsa20poly1305_SEEDBYTES = 32;33    const box_curve25519xsalsa20poly1305_PUBLICKEYBYTES = 32;34    const box_curve25519xsalsa20poly1305_SECRETKEYBYTES = 32;35    const box_curve25519xsalsa20poly1305_BEFORENMBYTES = 32;36    const box_curve25519xsalsa20poly1305_NONCEBYTES = 24;37    const box_curve25519xsalsa20poly1305_MACBYTES = 16;38    const box_curve25519xsalsa20poly1305_BOXZEROBYTES = 16;39    const box_curve25519xsalsa20poly1305_ZEROBYTES = 32;40 41    const onetimeauth_poly1305_BYTES = 16;42    const onetimeauth_poly1305_KEYBYTES = 32;43 44    const secretbox_xsalsa20poly1305_KEYBYTES = 32;45    const secretbox_xsalsa20poly1305_NONCEBYTES = 24;46    const secretbox_xsalsa20poly1305_MACBYTES = 16;47    const secretbox_xsalsa20poly1305_BOXZEROBYTES = 16;48    const secretbox_xsalsa20poly1305_ZEROBYTES = 32;49 50    const secretbox_xchacha20poly1305_KEYBYTES = 32;51    const secretbox_xchacha20poly1305_NONCEBYTES = 24;52    const secretbox_xchacha20poly1305_MACBYTES = 16;53    const secretbox_xchacha20poly1305_BOXZEROBYTES = 16;54    const secretbox_xchacha20poly1305_ZEROBYTES = 32;55 56    const stream_salsa20_KEYBYTES = 32;57 58    /**59     * AEAD Decryption with ChaCha20-Poly130560     *61     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.62     *63     * @param string $message64     * @param string $ad65     * @param string $nonce66     * @param string $key67     * @return string68     * @throws SodiumException69     * @throws TypeError70     */71    public static function aead_chacha20poly1305_decrypt(72        $message = '',73        $ad = '',74        $nonce = '',75        $key = ''76    ) {77        /** @var int $len - Length of message (ciphertext + MAC) */78        $len = ParagonIE_Sodium_Core_Util::strlen($message);79 80        /** @var int  $clen - Length of ciphertext */81        $clen = $len - self::aead_chacha20poly1305_ABYTES;82 83        /** @var int $adlen - Length of associated data */84        $adlen = ParagonIE_Sodium_Core_Util::strlen($ad);85 86        /** @var string $mac - Message authentication code */87        $mac = ParagonIE_Sodium_Core_Util::substr(88            $message,89            $clen,90            self::aead_chacha20poly1305_ABYTES91        );92 93        /** @var string $ciphertext - The encrypted message (sans MAC) */94        $ciphertext = ParagonIE_Sodium_Core_Util::substr($message, 0, $clen);