ParagonIE_Sodium_Compat::crypto_generichash_init

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Summery Summery

Initialize a BLAKE2b hashing context, for use in a streaming interface.

Syntax Syntax

ParagonIE_Sodium_Compat::crypto_generichash_init( string|null $key = '', int $length = self::CRYPTO_GENERICHASH_BYTES )

Parameters Parameters

$key

(string|null) (Optional) If specified must be a string between 16 and 64 bytes

Default value: ''

$length

(int) (Optional) The size of the desired hash output

Default value: self::CRYPTO_GENERICHASH_BYTES

Return Return

(string) A BLAKE2 hashing context, encoded as a string (To be 100% compatible with ext/libsodium)

Source Source

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

    public static function crypto_generichash_init($key = '', $length = self::CRYPTO_GENERICHASH_BYTES)
    {
        /* Type checks: */
        if (is_null($key)) {
            $key = '';
        }
        ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($length, 'int', 2);

        /* Input validation: */
        if (!empty($key)) {
            if (ParagonIE_Sodium_Core_Util::strlen($key) < self::CRYPTO_GENERICHASH_KEYBYTES_MIN) {
                throw new SodiumException('Unsupported key size. Must be at least CRYPTO_GENERICHASH_KEYBYTES_MIN bytes long.');
            }
            if (ParagonIE_Sodium_Core_Util::strlen($key) > self::CRYPTO_GENERICHASH_KEYBYTES_MAX) {
                throw new SodiumException('Unsupported key size. Must be at most CRYPTO_GENERICHASH_KEYBYTES_MAX bytes long.');
            }
        }

        if (self::useNewSodiumAPI()) {
            return sodium_crypto_generichash_init($key, $length);
        }
        if (self::use_fallback('crypto_generichash_init')) {
            return (string) call_user_func('\\Sodium\\crypto_generichash_init', $key, $length);
        }
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Crypto32::generichash_init($key, $length);
        }
        return ParagonIE_Sodium_Crypto::generichash_init($key, $length);
    }

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