openssl_sign

    (PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)

    openssl_sign — Generate signature

    Descrição

    openssl_sign(
        string$data,
        string&$signature,
        OpenSSLAsymmetricKey|OpenSSLCertificate|array|string$private_key,
        string|int$algorithm = OPENSSL_ALGO_SHA1
    ): bool

    openssl_sign() computes a signature for the specified data by generating a cryptographic digital signature using the private key associated with private_key. Note that the data itself is not encrypted.

    Parâmetros

    data

    The string of data you wish to sign

    signature

    If the call was successful the signature is returned in signature.

    private_key

    OpenSSLAsymmetricKey - a key, returned by openssl_get_privatekey()

    string - a PEM formatted key

    algorithm

    int - one of these Signature Algorithms.

    string - a valid string returned by openssl_get_md_methods() example, "sha256WithRSAEncryption" or "sha384".

    Valor Retornado

    Retorna true em caso de sucesso ou false em caso de falha.

    Registro de Alterações

    VersãoDescrição
    8.0.0private_key accepts an OpenSSLAsymmetricKey or OpenSSLCertificate instance now; previously, a resource of type OpenSSL key or OpenSSL X.509 was accepted.

    Exemplos

    Exemplo #1 openssl_sign() example

    <?php
    // $data is assumed to contain the data to be signed

    // fetch private key from file and ready it
    $pkeyid = openssl_pkey_get_private("file://src/openssl-0.9.6/demos/sign/key.pem");

    // compute signature
    openssl_sign($data, $signature, $pkeyid);

    // free the key from memory
    openssl_free_key($pkeyid);
    ?>

    Exemplo #2 openssl_sign() example

    <?php
    //data you want to sign
    $data = 'my data';

    //create new private and public key
    $new_key_pair = openssl_pkey_new(array(
    "private_key_bits" => 2048,
    "private_key_type" => OPENSSL_KEYTYPE_RSA,
    ));
    openssl_pkey_export($new_key_pair, $private_key_pem);

    $details = openssl_pkey_get_details($new_key_pair);
    $public_key_pem = $details['key'];

    //create signature
    openssl_sign($data, $signature, $private_key_pem, OPENSSL_ALGO_SHA256);

    //save for later
    file_put_contents('private_key.pem', $private_key_pem);
    file_put_contents('public_key.pem', $public_key_pem);
    file_put_contents('signature.dat', $signature);

    //verify signature
    $r = openssl_verify($data, $signature, $public_key_pem, "sha256WithRSAEncryption");
    var_dump($r);
    ?>

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