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Verifying a document.</b></p> +<pre class="PROGRAMLISTING">/** + * verify_file: + * @xml_file: the signed XML file name. + * @key_file: the PEM public key file name. + * + * Verifies XML signature in #xml_file using public key from #key_file. + * + * Returns 0 on success or a negative value if an error occurs. + */ +int +verify_file(const char* xml_file, const char* key_file) { + xmlDocPtr doc = NULL; + xmlNodePtr node = NULL; + xmlSecDSigCtxPtr dsigCtx = NULL; + int res = -1; + + assert(xml_file); + assert(key_file); + + /* load file */ + doc = xmlParseFile(xml_file); + if ((doc == NULL) || (xmlDocGetRootElement(doc) == NULL)){ + fprintf(stderr, "Error: unable to parse file \"%s\"\n", xml_file); + goto done; + } + + /* find start node */ + node = xmlSecFindNode(xmlDocGetRootElement(doc), xmlSecNodeSignature, xmlSecDSigNs); + if(node == NULL) { + fprintf(stderr, "Error: start node not found in \"%s\"\n", xml_file); + goto done; + } + + /* create signature context, we don't need keys manager in this example */ + dsigCtx = xmlSecDSigCtxCreate(NULL); + if(dsigCtx == NULL) { + fprintf(stderr,"Error: failed to create signature context\n"); + goto done; + } + + /* load public key */ + dsigCtx->signKey = xmlSecCryptoAppKeyLoad(key_file,xmlSecKeyDataFormatPem, NULL, NULL, NULL); + if(dsigCtx->signKey == NULL) { + fprintf(stderr,"Error: failed to load public pem key from \"%s\"\n", key_file); + goto done; + } + + /* set key name to the file name, this is just an example! */ + if(xmlSecKeySetName(dsigCtx->signKey, key_file) < 0) { + fprintf(stderr,"Error: failed to set key name for key from \"%s\"\n", key_file); + goto done; + } + + /* Verify signature */ + if(xmlSecDSigCtxVerify(dsigCtx, node) < 0) { + fprintf(stderr,"Error: signature verify\n"); + goto done; + } + + /* print verification result to stdout */ + if(dsigCtx->status == xmlSecDSigStatusSucceeded) { + fprintf(stdout, "Signature is OK\n"); + } else { + fprintf(stdout, "Signature is INVALID\n"); + } + + /* success */ + res = 0; + +done: + /* cleanup */ + if(dsigCtx != NULL) { + xmlSecDSigCtxDestroy(dsigCtx); + } + + if(doc != NULL) { + xmlFreeDoc(doc); + } + return(res); +} + </pre> +<p><a href="xmlsec-verify-with-key.html#XMLSEC-EXAMPLE-VERIFY1">Full Program Listing</a></p> +</div> + </div> +<table class="navigation" width="100%" summary="Navigation footer" cellpadding="2" cellspacing="2"><tr valign="middle"> +<td align="left"><a accesskey="p" href="xmlsec-notes-verify-decrypt.html"><b><<< Verifing and decrypting documents.</b></a></td> +<td align="right"><a accesskey="n" href="xmlsec-notes-decrypt.html"><b>Decrypting an encrypted document >>></b></a></td> +</tr></table> +</td></tr></table></td> +</tr></table></body> +</html> |