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CMS_get0_content.html
<?xml version="1.0" ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>CMS_get0_type</title> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <link rev="made" href="mailto:root@localhost" /> </head> <body> <ul id="index"> <li><a href="#NAME">NAME</a></li> <li><a href="#SYNOPSIS">SYNOPSIS</a></li> <li><a href="#DESCRIPTION">DESCRIPTION</a></li> <li><a href="#NOTES">NOTES</a></li> <li><a href="#RETURN-VALUES">RETURN VALUES</a></li> <li><a href="#SEE-ALSO">SEE ALSO</a></li> <li><a href="#COPYRIGHT">COPYRIGHT</a></li> </ul> <h1 id="NAME">NAME</h1> <p>CMS_get0_type, CMS_set1_eContentType, CMS_get0_eContentType, CMS_get0_content - get and set CMS content types and content</p> <h1 id="SYNOPSIS">SYNOPSIS</h1> <pre><code> #include <openssl/cms.h> const ASN1_OBJECT *CMS_get0_type(const CMS_ContentInfo *cms); int CMS_set1_eContentType(CMS_ContentInfo *cms, const ASN1_OBJECT *oid); const ASN1_OBJECT *CMS_get0_eContentType(CMS_ContentInfo *cms); ASN1_OCTET_STRING **CMS_get0_content(CMS_ContentInfo *cms);</code></pre> <h1 id="DESCRIPTION">DESCRIPTION</h1> <p>CMS_get0_type() returns the content type of a CMS_ContentInfo structure as an ASN1_OBJECT pointer. An application can then decide how to process the CMS_ContentInfo structure based on this value.</p> <p>CMS_set1_eContentType() sets the embedded content type of a CMS_ContentInfo structure. It should be called with CMS functions (such as <a href="/../man3/CMS_sign.html">CMS_sign</a>, <a href="/../man3/CMS_encrypt.html">CMS_encrypt</a>) with the <b>CMS_PARTIAL</b> flag and <b>before</b> the structure is finalised, otherwise the results are undefined.</p> <p>ASN1_OBJECT *CMS_get0_eContentType() returns a pointer to the embedded content type.</p> <p>CMS_get0_content() returns a pointer to the <b>ASN1_OCTET_STRING</b> pointer containing the embedded content.</p> <h1 id="NOTES">NOTES</h1> <p>As the <b>0</b> implies CMS_get0_type(), CMS_get0_eContentType() and CMS_get0_content() return internal pointers which should <b>not</b> be freed up. CMS_set1_eContentType() copies the supplied OID and it <b>should</b> be freed up after use.</p> <p>The <b>ASN1_OBJECT</b> values returned can be converted to an integer <b>NID</b> value using OBJ_obj2nid(). For the currently supported content types the following values are returned:</p> <pre><code> NID_pkcs7_data NID_pkcs7_signed NID_pkcs7_digest NID_id_smime_ct_compressedData: NID_pkcs7_encrypted NID_pkcs7_enveloped</code></pre> <p>The return value of CMS_get0_content() is a pointer to the <b>ASN1_OCTET_STRING</b> content pointer. That means that for example:</p> <pre><code> ASN1_OCTET_STRING **pconf = CMS_get0_content(cms);</code></pre> <p><b>*pconf</b> could be NULL if there is no embedded content. Applications can access, modify or create the embedded content in a <b>CMS_ContentInfo</b> structure using this function. Applications usually will not need to modify the embedded content as it is normally set by higher level functions.</p> <h1 id="RETURN-VALUES">RETURN VALUES</h1> <p>CMS_get0_type() and CMS_get0_eContentType() return an ASN1_OBJECT structure.</p> <p>CMS_set1_eContentType() returns 1 for success or 0 if an error occurred. The error can be obtained from ERR_get_error(3).</p> <h1 id="SEE-ALSO">SEE ALSO</h1> <p><a href="../man3/ERR_get_error.html">ERR_get_error(3)</a></p> <h1 id="COPYRIGHT">COPYRIGHT</h1> <p>Copyright 2008-2019 The OpenSSL Project Authors. All Rights Reserved.</p> <p>Licensed under the OpenSSL license (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p> </body> </html>
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