[xmlsec] Re: Including comments in signatures
Olav Morken
olavmo at stud.ntnu.no
Mon Jul 7 06:41:34 PDT 2008
Sorry, forgot to attach the files. They should be attached to this mail.
--
Olav Morken
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/**
* XML Security Library example: Signing a template file.
*
* Signs a template file using a key from PEM file
*
* Usage:
* ./sign1 <xml-tmpl> <pem-key>
*
* Example:
* ./sign1 sign1-tmpl.xml rsakey.pem > sign1-res.xml
*
* The result signature could be validated using verify1 example:
* ./verify1 sign1-res.xml rsapub.pem
*
* This is free software; see Copyright file in the source
* distribution for preciese wording.
*
* Copyright (C) 2002-2003 Aleksey Sanin <aleksey at aleksey.com>
*/
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <libxml/tree.h>
#include <libxml/xmlmemory.h>
#include <libxml/parser.h>
#ifndef XMLSEC_NO_XSLT
#include <libxslt/xslt.h>
#endif /* XMLSEC_NO_XSLT */
#include <xmlsec/xmlsec.h>
#include <xmlsec/xmltree.h>
#include <xmlsec/xmldsig.h>
#include <xmlsec/crypto.h>
int sign_file(const char* tmpl_file, const char* key_file);
int
main(int argc, char **argv) {
assert(argv);
if(argc != 3) {
fprintf(stderr, "Error: wrong number of arguments.\n");
fprintf(stderr, "Usage: %s <tmpl-file> <key-file>\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() < 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) < 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) < 0) {
fprintf(stderr, "Error: crypto initialization failed.\n");
return(-1);
}
/* Init xmlsec-crypto library */
if(xmlSecCryptoInit() < 0) {
fprintf(stderr, "Error: xmlsec-crypto initialization failed.\n");
return(-1);
}
if(sign_file(argv[1], argv[2]) < 0) {
return(-1);
}
/* 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);
}
/**
* sign_file:
* @tmpl_file: the signature template file name.
* @key_file: the PEM private key file name.
*
* Signs the #tmpl_file using private key from #key_file.
*
* Returns 0 on success or a negative value if an error occurs.
*/
int
sign_file(const char* tmpl_file, const char* key_file) {
xmlDocPtr doc = NULL;
xmlNodePtr node = NULL;
xmlSecDSigCtxPtr dsigCtx = NULL;
int res = -1;
assert(tmpl_file);
assert(key_file);
/* load template */
doc = xmlParseFile(tmpl_file);
if ((doc == NULL) || (xmlDocGetRootElement(doc) == NULL)){
fprintf(stderr, "Error: unable to parse file \"%s\"\n", tmpl_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", tmpl_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;
}
dsigCtx->flags |= XMLSEC_DSIG_FLAGS_STORE_SIGNEDINFO_REFERENCES;
/* load private key, assuming that there is not password */
dsigCtx->signKey = xmlSecCryptoAppKeyLoad(key_file, xmlSecKeyDataFormatPem, NULL, NULL, NULL);
if(dsigCtx->signKey == NULL) {
fprintf(stderr,"Error: failed to load private 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;
}
/* sign the template */
if(xmlSecDSigCtxSign(dsigCtx, node) < 0) {
fprintf(stderr,"Error: signature failed\n");
goto done;
}
/* print signed document to stdout */
xmlDocDump(stdout, doc);
xmlSecDSigCtxDebugDump(dsigCtx, stderr);
/* success */
res = 0;
done:
/* cleanup */
if(dsigCtx != NULL) {
xmlSecDSigCtxDestroy(dsigCtx);
}
if(doc != NULL) {
xmlFreeDoc(doc);
}
return(res);
}
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<?xml version="1.0" encoding="UTF-8"?>
<Test>
<!-- Comment! -->
<Data>test</Data>
<Signature xmlns="http://www.w3.org/2000/09/xmldsig#">
<SignedInfo>
<CanonicalizationMethod Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315" />
<SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1" />
<Reference URI="">
<Transforms>
<Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature" />
<Transform Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315#WithComments" />
</Transforms>
<DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1" />
<DigestValue></DigestValue>
</Reference>
</SignedInfo>
<SignatureValue/>
<KeyInfo>
<KeyName/>
</KeyInfo>
</Signature>
</Test>
-------------- next part --------------
= SIGNATURE CONTEXT
== Status: succeeded
== flags: 0x00000002
== flags2: 0x00000000
== Key Info Read Ctx:
= KEY INFO READ CONTEXT
== flags: 0x00000000
== flags2: 0x00000000
== enabled key data: all
== RetrievalMethod level (cur/max): 0/1
== TRANSFORMS CTX (status=0)
== flags: 0x00000000
== flags2: 0x00000000
== enabled transforms: all
=== uri: NULL
=== uri xpointer expr: NULL
== EncryptedKey level (cur/max): 0/1
=== KeyReq:
==== keyId: rsa
==== keyType: 0x00000002
==== keyUsage: 0x00000001
==== keyBitsSize: 0
=== list size: 0
== Key Info Write Ctx:
= KEY INFO WRITE CONTEXT
== flags: 0x00000000
== flags2: 0x00000000
== enabled key data: all
== RetrievalMethod level (cur/max): 0/1
== TRANSFORMS CTX (status=0)
== flags: 0x00000000
== flags2: 0x00000000
== enabled transforms: all
=== uri: NULL
=== uri xpointer expr: NULL
== EncryptedKey level (cur/max): 0/1
=== KeyReq:
==== keyId: NULL
==== keyType: 0x00000001
==== keyUsage: 0xffffffff
==== keyBitsSize: 0
=== list size: 0
== Signature Transform Ctx:
== TRANSFORMS CTX (status=2)
== flags: 0x00000000
== flags2: 0x00000000
== enabled transforms: all
=== uri: NULL
=== uri xpointer expr: NULL
=== Transform: c14n (href=http://www.w3.org/TR/2001/REC-xml-c14n-20010315)
=== Transform: rsa-sha1 (href=http://www.w3.org/2000/09/xmldsig#rsa-sha1)
=== Transform: base64 (href=http://www.w3.org/2000/09/xmldsig#base64)
=== Transform: membuf-transform (href=NULL)
== Signature Method:
=== Transform: rsa-sha1 (href=http://www.w3.org/2000/09/xmldsig#rsa-sha1)
== Signature Key:
== KEY
=== method: RSAKeyValue
=== key type: Private
=== key name: test.key
=== key usage: -1
=== rsa key: size = 1024
== SignedInfo References List:
=== list size: 1
= REFERENCE CALCULATION CONTEXT
== Status: succeeded
== URI: ""
== Reference Transform Ctx:
== TRANSFORMS CTX (status=2)
== flags: 0x00000000
== flags2: 0x00000000
== enabled transforms: all
=== uri: NULL
=== uri xpointer expr: NULL
=== Transform: enveloped-signature (href=http://www.w3.org/2000/09/xmldsig#enveloped-signature)
=== Transform: c14n-with-comments (href=http://www.w3.org/TR/2001/REC-xml-c14n-20010315#WithComments)
=== Transform: membuf-transform (href=NULL)
=== Transform: sha1 (href=http://www.w3.org/2000/09/xmldsig#sha1)
=== Transform: base64 (href=http://www.w3.org/2000/09/xmldsig#base64)
=== Transform: membuf-transform (href=NULL)
== Digest Method:
=== Transform: sha1 (href=http://www.w3.org/2000/09/xmldsig#sha1)
== PreDigest data - start buffer:
<Test>
<Data>test</Data>
</Test>
== PreDigest data - end buffer
== Result - start buffer:
PzGU8jurVXfW92pYRa4mzfDT4HE=
== Result - end buffer
== Manifest References List:
=== list size: 0
== Result - start buffer:
G82YIb6lHg4ixpdiBWiyl0lUOyuMLWJrKCzVsMcU//wAKmpX8NtliFFSrrwEwYrw
bl4H99XA4YknPgbe6LeyBydVx8XR8QQo90PiWcaNe3Tc/AeDoX/ASQQP0PQx9/Fq
vc1lXKOhqKfPBj29OpuOKDkyd25oqpyWSkufBbX8jJM=
== Result - end buffer
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