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Edit File : MaterialsProvider.php \| Size : 3.19 KB
<?php namespace Aws\Crypto; abstract class MaterialsProvider { private static $supportedKeySizes = [ 128 => true, 192 => true, 256 => true, ]; /** * Returns if the requested size is supported by AES. * * @param int $keySize Size of the requested key in bits. * * @return bool / public static function isSupportedKeySize($keySize) { return isset(self::$supportedKeySizes[$keySize]); } /* * Performs further initialization of the MaterialsProvider based on the * data inside the MetadataEnvelope. * * @param MetadataEnvelope $envelope A storage envelope for encryption * metadata to be read from. * * @return MaterialsProvider * * @throws \RuntimeException Thrown when there is an empty or improperly * formed materials description in the envelope. * * @internal / abstract public function fromDecryptionEnvelope(MetadataEnvelope $envelope); /* * Returns the material description for this Provider so it can be verified * by encryption mechanisms. * * @return string / abstract public function getMaterialsDescription(); /* * Returns the wrap algorithm name for this Provider. * * @return string / abstract public function getWrapAlgorithmName(); /* * Takes a content encryption key (CEK) and description to return an * encrypted key according to the Provider's specifications. * * @param string $unencryptedCek Key for use in encrypting other data * that itself needs to be encrypted by the * Provider. * @param string $materialDescription Material Description for use in * encrypting the $cek. * * @return string / abstract public function encryptCek($unencryptedCek, $materialDescription); /* * Takes an encrypted content encryption key (CEK) and material description * for use decrypting the key according to the Provider's specifications. * * @param string $encryptedCek Encrypted key to be decrypted by the Provider * for use decrypting other data. * @param string $materialDescription Material Description for use in * encrypting the $cek. * * @return string / abstract public function decryptCek($encryptedCek, $materialDescription); /* * @param string $keySize Length of a cipher key in bits for generating a * random content encryption key (CEK). * * @return string / public function generateCek($keySize) { return openssl_random_pseudo_bytes($keySize / 8); } /* * @param string $openSslName Cipher OpenSSL name to use for generating * an initialization vector. * * @return string */ public function generateIv($openSslName) { return openssl_random_pseudo_bytes( openssl_cipher_iv_length($openSslName) ); } } Back

Edit File : MaterialsProvider.php | Size : 3.19 KB

<?php
namespace Aws\Crypto;

abstract class MaterialsProvider
{
    private static $supportedKeySizes = [
        128 => true,
        192 => true,
        256 => true,
    ];

/**
     * Returns if the requested size is supported by AES.
     *
     * @param int $keySize Size of the requested key in bits.
     *
     * @return bool
     */
    public static function isSupportedKeySize($keySize)
    {
        return isset(self::$supportedKeySizes[$keySize]);
    }

/**
     * Performs further initialization of the MaterialsProvider based on the
     * data inside the MetadataEnvelope.
     *
     * @param MetadataEnvelope $envelope A storage envelope for encryption
     *                                   metadata to be read from.
     *
     * @return MaterialsProvider
     *
     * @throws \RuntimeException Thrown when there is an empty or improperly
     *                           formed materials description in the envelope.
     *
     * @internal
     */
    abstract public function fromDecryptionEnvelope(MetadataEnvelope $envelope);

/**
     * Returns the material description for this Provider so it can be verified
     * by encryption mechanisms.
     *
     * @return string
     */
    abstract public function getMaterialsDescription();

/**
     * Returns the wrap algorithm name for this Provider.
     *
     * @return string
     */
    abstract public function getWrapAlgorithmName();

/**
     * Takes a content encryption key (CEK) and description to return an
     * encrypted key according to the Provider's specifications.
     *
     * @param string $unencryptedCek Key for use in encrypting other data
     *                               that itself needs to be encrypted by the
     *                               Provider.
     * @param string $materialDescription Material Description for use in
     *                                    encrypting the $cek.
     *
     * @return string
     */
    abstract public function encryptCek($unencryptedCek, $materialDescription);

/**
     * Takes an encrypted content encryption key (CEK) and material description
     * for use decrypting the key according to the Provider's specifications.
     *
     * @param string $encryptedCek Encrypted key to be decrypted by the Provider
     *                             for use decrypting other data.
     * @param string $materialDescription Material Description for use in
     *                                    encrypting the $cek.
     *
     * @return string
     */
    abstract public function decryptCek($encryptedCek, $materialDescription);

/**
     * @param string $keySize Length of a cipher key in bits for generating a
     *                        random content encryption key (CEK).
     *
     * @return string
     */
    public function generateCek($keySize)
    {
        return openssl_random_pseudo_bytes($keySize / 8);
    }

/**
     * @param string $openSslName Cipher OpenSSL name to use for generating
     *                            an initialization vector.
     *
     * @return string
     */
    public function generateIv($openSslName)
    {
        return openssl_random_pseudo_bytes(
            openssl_cipher_iv_length($openSslName)
        );
    }
}

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