ParagonIE_Sodium_Compat::crypto_box_seal

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Summery Summery

Anonymous public-key encryption. Only the recipient may decrypt messages.

Syntax Syntax

ParagonIE_Sodium_Compat::crypto_box_seal( string $plaintext, string $publicKey )

Description Description

Algorithm: X25519-XSalsa20-Poly1305, as with crypto_box. The sender’s X25519 keypair is ephemeral. Nonce is generated from the BLAKE2b hash of both public keys.

This provides ciphertext integrity.

Parameters Parameters

$plaintext

(string) (Required) Message to be sealed

$publicKey

(string) (Required) Your recipient's public key

Return Return

(string) Sealed message that only your recipient can decrypt

Source Source

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

    public static function crypto_box_seal($plaintext, $publicKey)
    {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($plaintext, 'string', 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($publicKey, 'string', 2);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($publicKey) !== self::CRYPTO_BOX_PUBLICKEYBYTES) {
            throw new SodiumException('Argument 2 must be CRYPTO_BOX_PUBLICKEYBYTES long.');
        }

        if (self::useNewSodiumAPI()) {
            return (string) sodium_crypto_box_seal($plaintext, $publicKey);
        }
        if (self::use_fallback('crypto_box_seal')) {
            return (string) call_user_func('\\Sodium\\crypto_box_seal', $plaintext, $publicKey);
        }
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Crypto32::box_seal($plaintext, $publicKey);
        }
        return ParagonIE_Sodium_Crypto::box_seal($plaintext, $publicKey);
    }

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