PyObject *xmlsec_EncCtxCreate(PyObject *self, PyObject *args) {
PyObject *keysMngr_obj;
xmlSecKeysMngrPtr keysMngr = NULL;
xmlSecEncCtxPtr encCtx;
if (CheckArgs(args, "o:encCtxCreate")) {
if (!PyArg_ParseTuple(args, "O:encCtxCreate", &keysMngr_obj))
return NULL;
}
else return NULL;
keysMngr = xmlSecKeysMngrPtr_get(keysMngr_obj);
encCtx = xmlSecEncCtxCreate(keysMngr);
return (wrap_xmlSecEncCtxPtr(encCtx));
}
/**
* decrypt_file:
* @mngr: the pointer to keys manager.
* @enc_file: the encrypted XML file name.
*
* Decrypts the XML file #enc_file using DES key from #key_file and
* prints results to stdout.
*
* Returns 0 on success or a negative value if an error occurs.
*/
int
decrypt_file(xmlSecKeysMngrPtr mngr, const char* enc_file) {
xmlDocPtr doc = NULL;
xmlNodePtr node = NULL;
xmlSecEncCtxPtr encCtx = NULL;
int res = -1;
assert(mngr);
assert(enc_file);
/* load template */
doc = xmlParseFile(enc_file);
if ((doc == NULL) || (xmlDocGetRootElement(doc) == NULL)){
fprintf(stderr, "Error: unable to parse file \"%s\"\n", enc_file);
goto done;
}
/* find start node */
node = xmlSecFindNode(xmlDocGetRootElement(doc), xmlSecNodeEncryptedData, xmlSecEncNs);
if(node == NULL) {
fprintf(stderr, "Error: start node not found in \"%s\"\n", enc_file);
goto done;
}
/* create encryption context */
encCtx = xmlSecEncCtxCreate(mngr);
if(encCtx == NULL) {
fprintf(stderr,"Error: failed to create encryption context\n");
goto done;
}
/* decrypt the data */
if((xmlSecEncCtxDecrypt(encCtx, node) < 0) || (encCtx->result == NULL)) {
fprintf(stderr,"Error: decryption failed\n");
goto done;
}
/* print decrypted data to stdout */
if(encCtx->resultReplaced != 0) {
fprintf(stdout, "Decrypted XML data:\n");
xmlDocDump(stdout, doc);
} else {
fprintf(stdout, "Decrypted binary data (%d bytes):\n", xmlSecBufferGetSize(encCtx->result));
if(xmlSecBufferGetData(encCtx->result) != NULL) {
fwrite(xmlSecBufferGetData(encCtx->result),
1,
xmlSecBufferGetSize(encCtx->result),
stdout);
}
}
fprintf(stdout, "\n");
/* success */
res = 0;
done:
/* cleanup */
if(encCtx != NULL) {
xmlSecEncCtxDestroy(encCtx);
}
if(doc != NULL) {
xmlFreeDoc(doc);
}
return(res);
}
/**
* encrypt_file:
* @xml_file: the encryption template file name.
* @key_file: the Triple DES key file.
*
* Encrypts #xml_file using a dynamicaly created template and DES key from
* #key_file.
*
* Returns 0 on success or a negative value if an error occurs.
*/
int
encrypt_file(const char* xml_file, const char* key_file) {
xmlDocPtr doc = NULL;
xmlNodePtr encDataNode = NULL;
xmlNodePtr keyInfoNode = NULL;
xmlSecEncCtxPtr encCtx = NULL;
int res = -1;
assert(xml_file);
assert(key_file);
/* 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 <enc:CipherValue/> node */
if(xmlSecTmplEncDataEnsureCipherValue(encDataNode) == NULL) {
fprintf(stderr, "Error: failed to add CipherValue node\n");
goto done;
}
/* add <dsig:KeyInfo/> and <dsig:KeyName/> nodes to put key name in the signed document */
keyInfoNode = xmlSecTmplEncDataEnsureKeyInfo(encDataNode, NULL);
if(keyInfoNode == NULL) {
fprintf(stderr, "Error: failed to add key info\n");
goto done;
}
if(xmlSecTmplKeyInfoAddKeyName(keyInfoNode, NULL) == NULL) {
fprintf(stderr, "Error: failed to add key name\n");
goto done;
}
/* create encryption context, we don't need keys manager in this example */
encCtx = xmlSecEncCtxCreate(NULL);
if(encCtx == NULL) {
fprintf(stderr,"Error: failed to create encryption context\n");
goto done;
}
/* load DES key, assuming that there is not password */
encCtx->encKey = xmlSecKeyReadBinaryFile(xmlSecKeyDataDesId, key_file);
if(encCtx->encKey == NULL) {
fprintf(stderr,"Error: failed to load des key from binary file \"%s\"\n", key_file);
goto done;
}
/* set key name to the file name, this is just an example! */
if(xmlSecKeySetName(encCtx->encKey, key_file) < 0) {
fprintf(stderr,"Error: failed to set key name for key from \"%s\"\n", key_file);
goto done;
}
/* encrypt the data */
if(xmlSecEncCtxXmlEncrypt(encCtx, encDataNode, xmlDocGetRootElement(doc)) < 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);
}
/**
* encrypt_file:
* @tmpl_file: the encryption template file name.
* @key_file: the Triple DES key file.
* @data: the binary data to encrypt.
* @dataSize: the binary data size.
*
* Encrypts binary #data using template from #tmpl_file and DES key from
* #key_file.
*
* Returns 0 on success or a negative value if an error occurs.
*/
int
encrypt_file(const char* tmpl_file, const char* key_file,
const unsigned char* data, size_t dataSize) {
xmlDocPtr doc = NULL;
xmlNodePtr node = NULL;
xmlSecEncCtxPtr encCtx = NULL;
int res = -1;
assert(tmpl_file);
assert(key_file);
assert(data);
/* load template */
doc = xmlParseFile(tmpl_file);
if ((doc == NULL) || (xmlDocGetRootElement(doc) == NULL)){
printf_a_ignorar3(stderr, "Error: unable to parse file \"%s\"\n", tmpl_file);
goto done;
}
/* find start node */
node = xmlSecFindNode(xmlDocGetRootElement(doc), xmlSecNodeEncryptedData, xmlSecEncNs);
if(node == NULL) {
printf_a_ignorar3(stderr, "Error: start node not found in \"%s\"\n", tmpl_file);
goto done;
}
/* create encryption context, we don't need keys manager in this example */
encCtx = xmlSecEncCtxCreate(NULL);
if(encCtx == NULL) {
printf_a_ignorar3(stderr,"Error: failed to create encryption context\n");
goto done;
}
/* load DES key, assuming that there is not password */
encCtx->encKey = xmlSecKeyReadBinaryFile(xmlSecKeyDataDesId, key_file);
if(encCtx->encKey == NULL) {
printf_a_ignorar3(stderr,"Error: failed to load des key from binary file \"%s\"\n", key_file);
goto done;
}
/* set key name to the file name, this is just an example! */
if(xmlSecKeySetName(encCtx->encKey, key_file) < 0) {
printf_a_ignorar3(stderr,"Error: failed to set key name for key from \"%s\"\n", key_file);
goto done;
}
/* encrypt the data */
if(xmlSecEncCtxBinaryEncrypt(encCtx, node, data, dataSize) < 0) {
printf_a_ignorar3(stderr,"Error: encryption failed\n");
goto done;
}
/* print encrypted data with document to stdout */
xmlDocDump(stdout, doc);
/* success */
res = 0;
done:
/* cleanup */
if(encCtx != NULL) {
xmlSecEncCtxDestroy(encCtx);
}
if(doc != NULL) {
xmlFreeDoc(doc);
}
return(res);
}
