openssl_cms_encrypt

(PHP 8)

openssl_cms_encrypt — Encrypt a CMS message

说明

openssl_cms_encrypt(
    string $input_filename,
    string $output_filename,
    OpenSSLCertificate|array|string $certificate,
    ?array $headers,
    int $flags = 0,
    int $encoding = OPENSSL_ENCODING_SMIME,
    int $cipher_algo = OPENSSL_CIPHER_AES_128_CBC
): bool

This function encrypts content to one or more recipients, based on the certificates that are passed to it.

参数

input_filename: The file to be encrypted.
output_filename: The output file.
certificate: Recipients to encrypt to.
headers: Headers to include when S/MIME is used.
flags: Flags to be passed to CMS_sign.
encoding: An encoding to output. One of OPENSSL_ENCODING_SMIME, OPENSSL_ENCODING_DER or OPENSSL_ENCODING_PEM.
cipher_algo: A cypher to use.

返回值

成功时返回 true，或者在失败时返回 false。

更新日志

版本	说明
8.1.0	The default cipher algorithm (`cipher_algo`) is now AES-128-CBC (`OPENSSL_CIPHER_AES_128_CBC`). Previously, PKCS7/CMS was used (`OPENSSL_CIPHER_RC2_40`).

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Sebastian ¶

3 years ago

It took me a while to find out the correct way how to sign and encrypt data with these functions.
I needed that to communicate with German Health Insurance Providers as part of a DiGA. Maybe someone finds that useful.

<?php
function signAndEncrypt(string $rawData): string
{
    $tempDir = __DIR__ . '/tmp';
    $tempfileOriginal = tempnam($tempDir, 'original');
    $tempfileSigned = tempnam($tempDir, 'signed');
    $tempfileEncrypted = tempnam($tempDir, 'signedEncrypted');

    file_put_contents($tempfileOriginal, $rawData);

    // pick the correct certificate for the recipient
    $recipientsCertificateFile = __DIR__ . '/recipientsCertificate.pem';
    // -----BEGIN CERTIFICATE----- ...-----END CERTIFICATE-----
    $recipientsCertificate = file_get_contents($recipientsCertificateFile);

    // Certificate:
    //    Data:
    //        Version: 3 (0x2)...
    $myCertificate = file_get_contents(__DIR__ . '/my.crt');
    $myPrivateKey = openssl_pkey_get_private(
        // -----BEGIN RSA PRIVATE KEY----- ... -----END RSA PRIVATE KEY-----
        file_get_contents(__DIR__ . '/my.prv.key.pem')
    );

    openssl_cms_sign(
        input_filename: $tempfileOriginal,
        output_filename: $tempfileSigned,
        certificate: $myCertificate,
        private_key: $myPrivateKey,
        headers: [],
        encoding: OPENSSL_ENCODING_DER,
    );

    openssl_cms_encrypt(
        input_filename: $tempfileSigned,
        output_filename: $tempfileEncrypted,
        certificate: $recipientsCertificate,
        headers: [],
        flags: OPENSSL_CMS_BINARY | OPENSSL_CMS_NOSIGS | OPENSSL_CMS_NOVERIFY,
        encoding: OPENSSL_ENCODING_DER,
        cipher_algo: OPENSSL_CIPHER_AES_256_CBC
    );
    return file_get_contents($tempfileEncrypted);
}