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xmlsec1-devel-1.2.16-3.fc14.x86_64.rpm

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<br clear="all"><div class="SECT1">
<h1 class="SECT1"><a name="XMLSEC-ENCRYPT-WITH-SESSION-KEY">Encrypting data with a session key.</a></h1>
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<h2 class="SECT2"><a name="XMLSEC-EXAMPLE-ENCRYPT3">encrypt3.c</a></h2>
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<a name="AEN783"></a><pre class="PROGRAMLISTING">/** 
 * XML Security Library example: Encrypting XML file with a session key and dynamicaly created template.
 * 
 * Encrypts XML file using a dynamicaly created template file and a session 
 * DES key (encrypted with an RSA key).
 * 
 * Usage: 
 *      ./encrypt3 &lt;xml-doc&gt; &lt;rsa-pem-key-file&gt; 
 *
 * Example:
 *      ./encrypt3 encrypt3-doc.xml rsakey.pem &gt; encrypt3-res.xml
 *
 * The result could be decrypted with decrypt3 example:
 *      ./decrypt3 encrypt3-res.xml
 *
 * This is free software; see Copyright file in the source
 * distribution for preciese wording.
 * 
 * Copyright (C) 2002-2003 Aleksey Sanin &lt;aleksey@aleksey.com&gt;
 */
#include &lt;stdlib.h&gt;
#include &lt;string.h&gt;
#include &lt;assert.h&gt;

#include &lt;libxml/tree.h&gt;
#include &lt;libxml/xmlmemory.h&gt;
#include &lt;libxml/parser.h&gt;

#ifndef XMLSEC_NO_XSLT
#include &lt;libxslt/xslt.h&gt;
#endif /* XMLSEC_NO_XSLT */

#include &lt;xmlsec/xmlsec.h&gt;
#include &lt;xmlsec/xmltree.h&gt;
#include &lt;xmlsec/xmlenc.h&gt;
#include &lt;xmlsec/templates.h&gt;
#include &lt;xmlsec/crypto.h&gt;

xmlSecKeysMngrPtr load_rsa_keys(char* key_file);
int encrypt_file(xmlSecKeysMngrPtr mngr, const char* xml_file, const char* key_name);

int 
main(int argc, char **argv) {
    xmlSecKeysMngrPtr mngr;
    
    assert(argv);

    if(argc != 3) {
        fprintf(stderr, "Error: wrong number of arguments.\n");
        fprintf(stderr, "Usage: %s &lt;xml-file&gt; &lt;key-file&gt;\n", argv[0]);
        return(1);
    }

    /* Init libxml and libxslt libraries */
    xmlInitParser();
    LIBXML_TEST_VERSION
    xmlLoadExtDtdDefaultValue = XML_DETECT_IDS | XML_COMPLETE_ATTRS;
    xmlSubstituteEntitiesDefault(1);
#ifndef XMLSEC_NO_XSLT
    xmlIndentTreeOutput = 1; 
#endif /* XMLSEC_NO_XSLT */
                
    /* Init xmlsec library */
    if(xmlSecInit() &lt; 0) {
        fprintf(stderr, "Error: xmlsec initialization failed.\n");
        return(-1);
    }

    /* Check loaded library version */
    if(xmlSecCheckVersion() != 1) {
        fprintf(stderr, "Error: loaded xmlsec library version is not compatible.\n");
        return(-1);
    }

    /* Load default crypto engine if we are supporting dynamic
     * loading for xmlsec-crypto libraries. Use the crypto library
     * name ("openssl", "nss", etc.) to load corresponding 
     * xmlsec-crypto library.
     */
#ifdef XMLSEC_CRYPTO_DYNAMIC_LOADING
    if(xmlSecCryptoDLLoadLibrary(BAD_CAST XMLSEC_CRYPTO) &lt; 0) {
        fprintf(stderr, "Error: unable to load default xmlsec-crypto library. Make sure\n"
                        "that you have it installed and check shared libraries path\n"
                        "(LD_LIBRARY_PATH) envornment variable.\n");
        return(-1);     
    }
#endif /* XMLSEC_CRYPTO_DYNAMIC_LOADING */

    /* Init crypto library */
    if(xmlSecCryptoAppInit(NULL) &lt; 0) {
        fprintf(stderr, "Error: crypto initialization failed.\n");
        return(-1);
    }

    /* Init xmlsec-crypto library */
    if(xmlSecCryptoInit() &lt; 0) {
        fprintf(stderr, "Error: xmlsec-crypto initialization failed.\n");
        return(-1);
    }

    /* create keys manager and load keys */
    mngr = load_rsa_keys(argv[2]);
    if(mngr == NULL) {
        return(-1);
    }

    /* we use key filename as key name here */
    if(encrypt_file(mngr, argv[1], argv[2]) &lt; 0) {
        xmlSecKeysMngrDestroy(mngr);
        return(-1);
    }    

    /* destroy keys manager */
    xmlSecKeysMngrDestroy(mngr);
    
    /* Shutdown xmlsec-crypto library */
    xmlSecCryptoShutdown();
    
    /* Shutdown crypto library */
    xmlSecCryptoAppShutdown();
    
    /* Shutdown xmlsec library */
    xmlSecShutdown();

    /* Shutdown libxslt/libxml */
#ifndef XMLSEC_NO_XSLT
    xsltCleanupGlobals();            
#endif /* XMLSEC_NO_XSLT */
    xmlCleanupParser();
    
    return(0);
}

/**
 * load_rsa_keys:
 * @key_file:           the key filename.
 *
 * Creates simple keys manager and load RSA key from #key_file in it.
 * The caller is responsible for destroing returned keys manager using
 * @xmlSecKeysMngrDestroy.
 *
 * Returns the pointer to newly created keys manager or NULL if an error
 * occurs.
 */
xmlSecKeysMngrPtr 
load_rsa_keys(char* key_file) {
    xmlSecKeysMngrPtr mngr;
    xmlSecKeyPtr key;
    
    assert(key_file);
    
    /* create and initialize keys manager, we use a simple list based
     * keys manager, implement your own xmlSecKeysStore klass if you need
     * something more sophisticated 
     */
    mngr = xmlSecKeysMngrCreate();
    if(mngr == NULL) {
        fprintf(stderr, "Error: failed to create keys manager.\n");
        return(NULL);
    }
    if(xmlSecCryptoAppDefaultKeysMngrInit(mngr) &lt; 0) {
        fprintf(stderr, "Error: failed to initialize keys manager.\n");
        xmlSecKeysMngrDestroy(mngr);
        return(NULL);
    }    
    
    /* load private RSA key */
    key = xmlSecCryptoAppKeyLoad(key_file, xmlSecKeyDataFormatPem, NULL, NULL, NULL);
    if(key == NULL) {
        fprintf(stderr,"Error: failed to load rsa key from file \"%s\"\n", key_file);
        xmlSecKeysMngrDestroy(mngr);
        return(NULL);
    }

    /* set key name to the file name, this is just an example! */
    if(xmlSecKeySetName(key, BAD_CAST key_file) &lt; 0) {
        fprintf(stderr,"Error: failed to set key name for key from \"%s\"\n", key_file);
        xmlSecKeyDestroy(key);  
        xmlSecKeysMngrDestroy(mngr);
        return(NULL);
    }
        
    /* add key to keys manager, from now on keys manager is responsible 
     * for destroying key 
     */
    if(xmlSecCryptoAppDefaultKeysMngrAdoptKey(mngr, key) &lt; 0) {
        fprintf(stderr,"Error: failed to add key from \"%s\" to keys manager\n", key_file);
        xmlSecKeyDestroy(key);
        xmlSecKeysMngrDestroy(mngr);
        return(NULL);
    }

    return(mngr);
}

/**
 * encrypt_file:
 * @mngr:               the pointer to keys manager.
 * @xml_file:           the encryption template file name.
 * @key_name:           the RSA key name.
 *
 * Encrypts #xml_file using a dynamicaly created template, a session DES key 
 * and an RSA key from keys manager.
 *
 * Returns 0 on success or a negative value if an error occurs.
 */
int 
encrypt_file(xmlSecKeysMngrPtr mngr, const char* xml_file, const char* key_name) {
    xmlDocPtr doc = NULL;
    xmlNodePtr encDataNode = NULL;
    xmlNodePtr keyInfoNode = NULL;
    xmlNodePtr encKeyNode = NULL;
    xmlNodePtr keyInfoNode2 = NULL;
    xmlSecEncCtxPtr encCtx = NULL;
    int res = -1;
    
    assert(mngr);
    assert(xml_file);
    assert(key_name);

    /* load template */
    doc = xmlParseFile(xml_file);
    if ((doc == NULL) || (xmlDocGetRootElement(doc) == NULL)){
        fprintf(stderr, "Error: unable to parse file \"%s\"\n", xml_file);
        goto done;      
    }
    
    /* create encryption template to encrypt XML file and replace 
     * its content with encryption result */
    encDataNode = xmlSecTmplEncDataCreate(doc, xmlSecTransformDes3CbcId,
                                NULL, xmlSecTypeEncElement, NULL, NULL);
    if(encDataNode == NULL) {
        fprintf(stderr, "Error: failed to create encryption template\n");
        goto done;   
    }

    /* we want to put encrypted data in the &lt;enc:CipherValue/&gt; node */
    if(xmlSecTmplEncDataEnsureCipherValue(encDataNode) == NULL) {
        fprintf(stderr, "Error: failed to add CipherValue node\n");
        goto done;   
    }

    /* add &lt;dsig:KeyInfo/&gt; */
    keyInfoNode = xmlSecTmplEncDataEnsureKeyInfo(encDataNode, NULL);
    if(keyInfoNode == NULL) {
        fprintf(stderr, "Error: failed to add key info\n");
        goto done;              
    }

    /* add &lt;enc:EncryptedKey/&gt; to store the encrypted session key */
    encKeyNode = xmlSecTmplKeyInfoAddEncryptedKey(keyInfoNode, 
                                    xmlSecTransformRsaPkcs1Id, 
                                    NULL, NULL, NULL);
    if(encKeyNode == NULL) {
        fprintf(stderr, "Error: failed to add key info\n");
        goto done;              
    }

    /* we want to put encrypted key in the &lt;enc:CipherValue/&gt; node */
    if(xmlSecTmplEncDataEnsureCipherValue(encKeyNode) == NULL) {
        fprintf(stderr, "Error: failed to add CipherValue node\n");
        goto done;   
    }

    /* add &lt;dsig:KeyInfo/&gt; and &lt;dsig:KeyName/&gt; nodes to &lt;enc:EncryptedKey/&gt; */
    keyInfoNode2 = xmlSecTmplEncDataEnsureKeyInfo(encKeyNode, NULL);
    if(keyInfoNode2 == NULL) {
        fprintf(stderr, "Error: failed to add key info\n");
        goto done;              
    }
    
    /* set key name so we can lookup key when needed */
    if(xmlSecTmplKeyInfoAddKeyName(keyInfoNode2, key_name) == NULL) {
        fprintf(stderr, "Error: failed to add key name\n");
        goto done;              
    }

    /* create encryption context */
    encCtx = xmlSecEncCtxCreate(mngr);
    if(encCtx == NULL) {
        fprintf(stderr,"Error: failed to create encryption context\n");
        goto done;
    }

    /* generate a Triple DES key */
    encCtx-&gt;encKey = xmlSecKeyGenerate(xmlSecKeyDataDesId, 192, xmlSecKeyDataTypeSession);
    if(encCtx-&gt;encKey == NULL) {
        fprintf(stderr,"Error: failed to generate session des key\n");
        goto done;
    }

    /* encrypt the data */
    if(xmlSecEncCtxXmlEncrypt(encCtx, encDataNode, xmlDocGetRootElement(doc)) &lt; 0) {
        fprintf(stderr,"Error: encryption failed\n");
        goto done;
    }
    
    /* we template is inserted in the doc */
    encDataNode = NULL;
        
    /* print encrypted data with document to stdout */
    xmlDocDump(stdout, doc);
    
    /* success */
    res = 0;

done:    

    /* cleanup */
    if(encCtx != NULL) {
        xmlSecEncCtxDestroy(encCtx);
    }

    if(encDataNode != NULL) {
        xmlFreeNode(encDataNode);
    }
        
    if(doc != NULL) {
        xmlFreeDoc(doc); 
    }
    return(res);
}
</pre>
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<br clear="all"><div class="SECT2">
<h2 class="SECT2"><a name="XMLSEC-EXAMPLE-ENCRYPT3-DOC">encrypt3-doc.xml</a></h2>
<p></p>
<div class="INFORMALEXAMPLE">
<p></p>
<a name="AEN788"></a><pre class="PROGRAMLISTING">&lt;?xml version="1.0" encoding="UTF-8"?&gt;
&lt;!-- 
XML Security Library example: Original XML doc file before encryption (encrypt3 example). 
--&gt;
&lt;Envelope xmlns="urn:envelope"&gt;
  &lt;Data&gt;
	Hello, World!
  &lt;/Data&gt;
&lt;/Envelope&gt;</pre>
<p></p>
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<br clear="all"><div class="SECT2">
<h2 class="SECT2"><a name="XMLSEC-EXAMPLE-ENCRYPT3-RES">encrypt3-res.xml</a></h2>
<p></p>
<div class="INFORMALEXAMPLE">
<p></p>
<a name="AEN793"></a><pre class="PROGRAMLISTING">&lt;?xml version="1.0" encoding="UTF-8"?&gt;
&lt;!-- 
XML Security Library example: XML doc file encrypted with a session DES key (encrypt3 example). 
--&gt;
&lt;EncryptedData xmlns="http://www.w3.org/2001/04/xmlenc#" Type="http://www.w3.org/2001/04/xmlenc#Element"&gt;
&lt;EncryptionMethod Algorithm="http://www.w3.org/2001/04/xmlenc#tripledes-cbc"/&gt;
&lt;KeyInfo xmlns="http://www.w3.org/2000/09/xmldsig#"&gt;
&lt;EncryptedKey xmlns="http://www.w3.org/2001/04/xmlenc#"&gt;
&lt;EncryptionMethod Algorithm="http://www.w3.org/2001/04/xmlenc#rsa-oaep-mgf1p"/&gt;
&lt;KeyInfo xmlns="http://www.w3.org/2000/09/xmldsig#"&gt;
&lt;KeyName&gt;rsakey.pem&lt;/KeyName&gt;
&lt;/KeyInfo&gt;
&lt;CipherData&gt;
&lt;CipherValue&gt;IPiEu9Nv+EsGyvVeXO9nl5iZhhi+uzQH1I3/DTs3+eamBvioyaawRIlvTql7LYL5
Mi91Qs8ozfW/fWZ8zB8AE2PosaX37SqiuEta68+65/Ed4v1rkGN0Awux8+gJqJmp
c2kJhzAoQIAIGAW4nTGP9tl9QUHfwKh2KPA104vezk70ijvF7TrbTmhdfmULAuWK
Tbsg8sXAPhGmPh5KckM2Xe387iPh4ue2+2TGdWqwXygVdvIUIbcIMq6F+/mWlcmf
Gs5FVI7CTjaLmeyO4ho+FGmicmqH2hEkZW0a2ktDh4BU/MxYF6L7oayrVWDGp2IH
dzQAwUT2qJcFjElO8xUz3g==&lt;/CipherValue&gt;
&lt;/CipherData&gt;
&lt;/EncryptedKey&gt;
&lt;/KeyInfo&gt;
&lt;CipherData&gt;
&lt;CipherValue&gt;xrfPSA+BEI+8ca23RN34gtee5lOMx8Cn+ZGWyxitiktdZ1+XREH+57li63VutCwp
s6ifbZgXIBsFdxPpMBUFlyTWAAO+NLooIwGoczXi14z62lHr7Ck6FA==&lt;/CipherValue&gt;
&lt;/CipherData&gt;
&lt;/EncryptedData&gt;</pre>
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