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<a name="Operations"></a>
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<p>
Previous: <a href="Abstract-private-keys.html#Abstract-private-keys" accesskey="p" rel="prev">Abstract private keys</a>, Up: <a href="Abstract-key-types.html#Abstract-key-types" accesskey="u" rel="up">Abstract key types</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Function-and-Data-Index.html#Function-and-Data-Index" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<a name="Operations-1"></a>
<h4 class="subsection">5.1.3 Operations</h4>
<p>The abstract key types can be used to access signing and
signature verification operations with the underlying keys.
</p>
<dl>
<dt><a name="index-gnutls_005fpubkey_005fverify_005fdata2"></a>Function: <em>int</em> <strong>gnutls_pubkey_verify_data2</strong> <em>(gnutls_pubkey_t <var>pubkey</var>, gnutls_sign_algorithm_t <var>algo</var>, unsigned int <var>flags</var>, const gnutls_datum_t * <var>data</var>, const gnutls_datum_t * <var>signature</var>)</em></dt>
<dd><p><var>pubkey</var>: Holds the public key
</p>
<p><var>algo</var>: The signature algorithm used
</p>
<p><var>flags</var>: Zero or an OR list of <code>gnutls_certificate_verify_flags</code>
</p>
<p><var>data</var>: holds the signed data
</p>
<p><var>signature</var>: contains the signature
</p>
<p>This function will verify the given signed data, using the
parameters from the certificate.
</p>
<p><strong>Returns:</strong> In case of a verification failure <code>GNUTLS_E_PK_SIG_VERIFY_FAILED</code>
is returned, and zero or positive code on success. For known to be insecure
signatures this function will return <code>GNUTLS_E_INSUFFICIENT_SECURITY</code> unless
the flag <code>GNUTLS_VERIFY_ALLOW_BROKEN</code> is specified.
</p>
<p><strong>Since:</strong> 3.0
</p></dd></dl>
<dl>
<dt><a name="index-gnutls_005fpubkey_005fverify_005fhash2"></a>Function: <em>int</em> <strong>gnutls_pubkey_verify_hash2</strong> <em>(gnutls_pubkey_t <var>key</var>, gnutls_sign_algorithm_t <var>algo</var>, unsigned int <var>flags</var>, const gnutls_datum_t * <var>hash</var>, const gnutls_datum_t * <var>signature</var>)</em></dt>
<dd><p><var>key</var>: Holds the public key
</p>
<p><var>algo</var>: The signature algorithm used
</p>
<p><var>flags</var>: Zero or an OR list of <code>gnutls_certificate_verify_flags</code>
</p>
<p><var>hash</var>: holds the hash digest to be verified
</p>
<p><var>signature</var>: contains the signature
</p>
<p>This function will verify the given signed digest, using the
parameters from the public key. Note that unlike <code>gnutls_privkey_sign_hash()</code> ,
this function accepts a signature algorithm instead of a digest algorithm.
You can use <code>gnutls_pk_to_sign()</code> to get the appropriate value.
</p>
<p><strong>Returns:</strong> In case of a verification failure <code>GNUTLS_E_PK_SIG_VERIFY_FAILED</code>
is returned, and zero or positive code on success.
</p>
<p><strong>Since:</strong> 3.0
</p></dd></dl>
<dl>
<dt><a name="index-gnutls_005fpubkey_005fencrypt_005fdata"></a>Function: <em>int</em> <strong>gnutls_pubkey_encrypt_data</strong> <em>(gnutls_pubkey_t <var>key</var>, unsigned int <var>flags</var>, const gnutls_datum_t * <var>plaintext</var>, gnutls_datum_t * <var>ciphertext</var>)</em></dt>
<dd><p><var>key</var>: Holds the public key
</p>
<p><var>flags</var>: should be 0 for now
</p>
<p><var>plaintext</var>: The data to be encrypted
</p>
<p><var>ciphertext</var>: contains the encrypted data
</p>
<p>This function will encrypt the given data, using the public
key.
</p>
<p><strong>Returns:</strong> On success, <code>GNUTLS_E_SUCCESS</code> (0) is returned, otherwise a
negative error value.
</p>
<p><strong>Since:</strong> 3.0
</p></dd></dl>
<dl>
<dt><a name="index-gnutls_005fprivkey_005fsign_005fdata"></a>Function: <em>int</em> <strong>gnutls_privkey_sign_data</strong> <em>(gnutls_privkey_t <var>signer</var>, gnutls_digest_algorithm_t <var>hash</var>, unsigned int <var>flags</var>, const gnutls_datum_t * <var>data</var>, gnutls_datum_t * <var>signature</var>)</em></dt>
<dd><p><var>signer</var>: Holds the key
</p>
<p><var>hash</var>: should be a digest algorithm
</p>
<p><var>flags</var>: Zero or one of <code>gnutls_privkey_flags_t</code>
</p>
<p><var>data</var>: holds the data to be signed
</p>
<p><var>signature</var>: will contain the signature allocated with <code>gnutls_malloc()</code>
</p>
<p>This function will sign the given data using a signature algorithm
supported by the private key. Signature algorithms are always used
together with a hash functions. Different hash functions may be
used for the RSA algorithm, but only the SHA family for the DSA keys.
</p>
<p>You may use <code>gnutls_pubkey_get_preferred_hash_algorithm()</code> to determine
the hash algorithm.
</p>
<p><strong>Returns:</strong> On success, <code>GNUTLS_E_SUCCESS</code> (0) is returned, otherwise a
negative error value.
</p>
<p><strong>Since:</strong> 2.12.0
</p></dd></dl>
<dl>
<dt><a name="index-gnutls_005fprivkey_005fsign_005fhash"></a>Function: <em>int</em> <strong>gnutls_privkey_sign_hash</strong> <em>(gnutls_privkey_t <var>signer</var>, gnutls_digest_algorithm_t <var>hash_algo</var>, unsigned int <var>flags</var>, const gnutls_datum_t * <var>hash_data</var>, gnutls_datum_t * <var>signature</var>)</em></dt>
<dd><p><var>signer</var>: Holds the signer’s key
</p>
<p><var>hash_algo</var>: The hash algorithm used
</p>
<p><var>flags</var>: Zero or one of <code>gnutls_privkey_flags_t</code>
</p>
<p><var>hash_data</var>: holds the data to be signed
</p>
<p><var>signature</var>: will contain newly allocated signature
</p>
<p>This function will sign the given hashed data using a signature algorithm
supported by the private key. Signature algorithms are always used
together with a hash functions. Different hash functions may be
used for the RSA algorithm, but only SHA-XXX for the DSA keys.
</p>
<p>You may use <code>gnutls_pubkey_get_preferred_hash_algorithm()</code> to determine
the hash algorithm.
</p>
<p>Note that if <code>GNUTLS_PRIVKEY_SIGN_FLAG_TLS1_RSA</code> flag is specified this function
will ignore <code>hash_algo</code> and perform a raw PKCS1 signature.
</p>
<p><strong>Returns:</strong> On success, <code>GNUTLS_E_SUCCESS</code> (0) is returned, otherwise a
negative error value.
</p>
<p><strong>Since:</strong> 2.12.0
</p></dd></dl>
<dl>
<dt><a name="index-gnutls_005fprivkey_005fdecrypt_005fdata"></a>Function: <em>int</em> <strong>gnutls_privkey_decrypt_data</strong> <em>(gnutls_privkey_t <var>key</var>, unsigned int <var>flags</var>, const gnutls_datum_t * <var>ciphertext</var>, gnutls_datum_t * <var>plaintext</var>)</em></dt>
<dd><p><var>key</var>: Holds the key
</p>
<p><var>flags</var>: zero for now
</p>
<p><var>ciphertext</var>: holds the data to be decrypted
</p>
<p><var>plaintext</var>: will contain the decrypted data, allocated with <code>gnutls_malloc()</code>
</p>
<p>This function will decrypt the given data using the algorithm
supported by the private key.
</p>
<p><strong>Returns:</strong> On success, <code>GNUTLS_E_SUCCESS</code> (0) is returned, otherwise a
negative error value.
</p>
<p><strong>Since:</strong> 2.12.0
</p></dd></dl>
<p>Signing existing structures, such as certificates, CRLs,
or certificate requests, as well as associating public
keys with structures is also possible using the
key abstractions.
</p>
<dl>
<dt><a name="index-gnutls_005fx509_005fcrq_005fset_005fpubkey"></a>Function: <em>int</em> <strong>gnutls_x509_crq_set_pubkey</strong> <em>(gnutls_x509_crq_t <var>crq</var>, gnutls_pubkey_t <var>key</var>)</em></dt>
<dd><p><var>crq</var>: should contain a <code>gnutls_x509_crq_t</code> type
</p>
<p><var>key</var>: holds a public key
</p>
<p>This function will set the public parameters from the given public
key to the request.
</p>
<p><strong>Returns:</strong> On success, <code>GNUTLS_E_SUCCESS</code> (0) is returned, otherwise a
negative error value.
</p>
<p><strong>Since:</strong> 2.12.0
</p></dd></dl>
<dl>
<dt><a name="index-gnutls_005fx509_005fcrt_005fset_005fpubkey"></a>Function: <em>int</em> <strong>gnutls_x509_crt_set_pubkey</strong> <em>(gnutls_x509_crt_t <var>crt</var>, gnutls_pubkey_t <var>key</var>)</em></dt>
<dd><p><var>crt</var>: should contain a <code>gnutls_x509_crt_t</code> type
</p>
<p><var>key</var>: holds a public key
</p>
<p>This function will set the public parameters from the given public
key to the request.
</p>
<p><strong>Returns:</strong> On success, <code>GNUTLS_E_SUCCESS</code> (0) is returned, otherwise a
negative error value.
</p>
<p><strong>Since:</strong> 2.12.0
</p></dd></dl>
<dl compact="compact">
<dt><code><var>int</var> <a href="Abstract-key-API.html#gnutls_005fx509_005fcrt_005fprivkey_005fsign">gnutls_x509_crt_privkey_sign</a> (gnutls_x509_crt_t <var>crt</var>, gnutls_x509_crt_t <var>issuer</var>, gnutls_privkey_t <var>issuer_key</var>, gnutls_digest_algorithm_t <var>dig</var>, unsigned int <var>flags</var>)</code></dt>
<dt><code><var>int</var> <a href="Abstract-key-API.html#gnutls_005fx509_005fcrl_005fprivkey_005fsign">gnutls_x509_crl_privkey_sign</a> (gnutls_x509_crl_t <var>crl</var>, gnutls_x509_crt_t <var>issuer</var>, gnutls_privkey_t <var>issuer_key</var>, gnutls_digest_algorithm_t <var>dig</var>, unsigned int <var>flags</var>)</code></dt>
<dt><code><var>int</var> <a href="Abstract-key-API.html#gnutls_005fx509_005fcrq_005fprivkey_005fsign">gnutls_x509_crq_privkey_sign</a> (gnutls_x509_crq_t <var>crq</var>, gnutls_privkey_t <var>key</var>, gnutls_digest_algorithm_t <var>dig</var>, unsigned int <var>flags</var>)</code></dt>
</dl>
<hr>
<div class="header">
<p>
Previous: <a href="Abstract-private-keys.html#Abstract-private-keys" accesskey="p" rel="prev">Abstract private keys</a>, Up: <a href="Abstract-key-types.html#Abstract-key-types" accesskey="u" rel="up">Abstract key types</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Function-and-Data-Index.html#Function-and-Data-Index" title="Index" rel="index">Index</a>]</p>
</div>
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