ParagonIE_Sodium_Compat::crypto_stream_xchacha20_xor_ic() – DANGER! UNAUTHENTICATED ENCRYPTION!

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Description

DANGER! UNAUTHENTICATED ENCRYPTION!

Unless you are following expert advice, do not use this feature. Algorithm: XChaCha20 This DOES NOT provide ciphertext integrity.

Usage

$string = ParagonIE_Sodium_Compat::crypto_stream_xchacha20_xor_ic( $message, $nonce, $counter, $key, $dontFallback );

Parameters

$message
( string ) required – Plaintext message
$nonce
( string ) required – Number to be used Once; must be 24 bytes
$counter
( int ) required –
$key
( string ) required – Encryption key
$dontFallback
( bool ) optional –

Returns

string Encrypted text which is vulnerable to chosen- ciphertext attacks unless you implement some other mitigation to the ciphertext (i.e. Encrypt then MAC)

Source

File name: wordpress/wp-includes/sodium_compat/src/Compat.php


Lines:

1 to 27 of 27
    public static function crypto_stream_xchacha20_xor_ic($message, $nonce, $counter, $key, $dontFallback = false)
    {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::ParagonIE_Sodium_Core_Util::declareScalarType($message, 'string', 1);
        ParagonIE_Sodium_Core_Util::ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 2);
        ParagonIE_Sodium_Core_Util::ParagonIE_Sodium_Core_Util::declareScalarType($counter, 'int', 3);
        ParagonIE_Sodium_Core_Util::ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 4);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_STREAM_XCHACHA20_NONCEBYTES) {
            throw new SodiumException('Argument 2 must be CRYPTO_SECRETBOX_XCHACHA20_NONCEBYTES long.');
        }
        if (ParagonIE_Sodium_Core_Util::ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_STREAM_XCHACHA20_KEYBYTES) {
            throw new SodiumException('Argument 3 must be CRYPTO_SECRETBOX_XCHACHA20_KEYBYTES long.');
        }

        if (is_callable('sodium_crypto_stream_xchacha20_xor_ic') && !$dontFallback) {
            return sodium_crypto_stream_xchacha20_xor_ic($message, $nonce, $counter, $key);
        }

        $ic = ParagonIE_Sodium_Core_Util::ParagonIE_Sodium_Core_Util::store64_le($counter);
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Core32_XChaCha20::ParagonIE_Sodium_Core32_XChaCha20::streamXorIc($message, $nonce, $key, $ic);
        }
        return ParagonIE_Sodium_Core_XChaCha20::ParagonIE_Sodium_Core_XChaCha20::streamXorIc($message, $nonce, $key, $ic);
    }
 

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