Debugging
Use the debugging features built into the library
Print the Manifest Store JUMBF Structure
C2PA Manifests are stored in JUMBF boxes within the media file. The libc2pa code looks for specific values in the C2PA_DEBUG_BOXES environment variable. If set, then it will print out information (to stdout) about the structure of the JUMBF boxes that it finds while performing validation of a signed C2PA media file.
Valid values for C2PA_DEBUG_BOXES are:
table- Generates an ASCII table with information about each box found.pictorial- Generates an ASCII "picture" portraying the boxes found, and how they are nested.json- Generates a JSON document showing information about the boxes found.
Example of table output
table output$ C2PA_DEBUG_BOXES=table ./a.out image.jpg
BOX_DESC TYPE OFFSET SIZE SALT LABEL
Super jumb 0 26906
Super jumb 38 26868
Description jumd 46 83 com.truepic:urn:uuid:9f9ce6fd-cc11-472d-91e9-f1821c27955c
Super jumb 129 462
Description jumd 137 41 c2pa.assertions
Super jumb 178 197
Description jumd 186 85 YES com.truepic.libc2pa
Content cbor 271 104
Super jumb 375 216
Description jumd 383 80 YES c2pa.hash.data
Content cbor 463 128
Super jumb 591 659
Description jumd 599 36 c2pa.claim
Content cbor 635 615
Super jumb 1250 25656
Description jumd 1258 40 c2pa.signature
Content cbor 1298 25608
This shows the structure of the Manifest Store in image.jpg. It is 26906 bytes in size. It contains:
- A single Manifest,
com.truepic:urn:uuid:9f9ce6fd-cc11-472d-91e9-f1821c27955c, which is26868bytes in size. This Manifest contains:- An Assertion Store (
c2pa.assertions) which is462bytes in size. The Assertion Store contains:- A
com.truepic.libc2paassertion of size197with CBOR content of size104bytes. - A
c2pa.hash.dataassertion of size216with CBOR content of size128bytes.
- A
- A Claim (
c2pa.claim) which is659bytes in size with CBOR content of size615bytes. - A Signature (
c2pa.signature) which is25656bytes in size with CBOR content of size25608bytes.
- An Assertion Store (
Example of pictorial output
pictorial output$ C2PA_DEBUG_BOXES=pictorial ./a.out image.jpg
SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS
S Super S
S S
S Start: 0 S
S Type: jumb S
S Size: 26906 S
S S
S SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS S
S S Super S S
S S S S
S S Start: 38 S S
S S Type: jumb S S
S S Size: 26868 S S
S S S S
S S DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD S S
S S D Description D S S
S S D D S S
S S D Start: 46 D S S
S S D Type: jumd D S S
S S D Size: 83 D S S
S S D Label: com.truepic:urn:uuid:9f9ce6fd-cc11-472d-91e9-f1821c27955c D S S
S S D D S S
S S DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD S S
S S S S
S S SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS S S
S S S Super S S S
S S S S S S
S S S Start: 129 S S S
S S S Type: jumb S S S
S S S Size: 462 S S S
S S S S S S
S S S DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD S S S
S S S D Description D S S S
S S S D D S S S
S S S D Start: 137 D S S S
S S S D Type: jumd D S S S
S S S D Size: 41 D S S S
S S S D Label: c2pa.assertions D S S S
S S S D D S S S
S S S DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD S S S
S S S S S S
S S S SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS S S S
S S S S Super S S S S
S S S S S S S S
S S S S Start: 178 S S S S
S S S S Type: jumb S S S S
S S S S Size: 197 S S S S
S S S S S S S S
S S S S DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD S S S S
S S S S D Description D S S S S
S S S S D D S S S S
S S S S D Start: 186 D S S S S
S S S S D Type: jumd D S S S S
S S S S D Size: 85 D S S S S
S S S S D HAS SALT D S S S S
S S S S D Label: com.truepic.libc2pa D S S S S
S S S S D D S S S S
S S S S DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD S S S S
S S S S S S S S
S S S S CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC S S S S
S S S S C Content C S S S S
S S S S C C S S S S
S S S S C Start: 271 C S S S S
S S S S C Type: cbor C S S S S
S S S S C Size: 104 C S S S S
S S S S C C S S S S
S S S S CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC S S S S
S S S S S S S S
S S S SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS S S S
S S S S S S
S S S SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS S S S
S S S S Super S S S S
S S S S S S S S
S S S S Start: 375 S S S S
S S S S Type: jumb S S S S
S S S S Size: 216 S S S S
S S S S S S S S
S S S S DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD S S S S
S S S S D Description D S S S S
S S S S D D S S S S
S S S S D Start: 383 D S S S S
S S S S D Type: jumd D S S S S
S S S S D Size: 80 D S S S S
S S S S D HAS SALT D S S S S
S S S S D Label: c2pa.hash.data D S S S S
S S S S D D S S S S
S S S S DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD S S S S
S S S S S S S S
S S S S CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC S S S S
S S S S C Content C S S S S
S S S S C C S S S S
S S S S C Start: 463 C S S S S
S S S S C Type: cbor C S S S S
S S S S C Size: 128 C S S S S
S S S S C C S S S S
S S S S CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC S S S S
S S S S S S S S
S S S SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS S S S
S S S S S S
S S SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS S S
S S S S
S S SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS S S
S S S Super S S S
S S S S S S
S S S Start: 591 S S S
S S S Type: jumb S S S
S S S Size: 659 S S S
S S S S S S
S S S DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD S S S
S S S D Description D S S S
S S S D D S S S
S S S D Start: 599 D S S S
S S S D Type: jumd D S S S
S S S D Size: 36 D S S S
S S S D Label: c2pa.claim D S S S
S S S D D S S S
S S S DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD S S S
S S S S S S
S S S CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC S S S
S S S C Content C S S S
S S S C C S S S
S S S C Start: 635 C S S S
S S S C Type: cbor C S S S
S S S C Size: 615 C S S S
S S S C C S S S
S S S CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC S S S
S S S S S S
S S SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS S S
S S S S
S S SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS S S
S S S Super S S S
S S S S S S
S S S Start: 1250 S S S
S S S Type: jumb S S S
S S S Size: 25656 S S S
S S S S S S
S S S DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD S S S
S S S D Description D S S S
S S S D D S S S
S S S D Start: 1258 D S S S
S S S D Type: jumd D S S S
S S S D Size: 40 D S S S
S S S D Label: c2pa.signature D S S S
S S S D D S S S
S S S DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD S S S
S S S S S S
S S S CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC S S S
S S S C Content C S S S
S S S C C S S S
S S S C Start: 1298 C S S S
S S S C Type: cbor C S S S
S S S C Size: 25608 C S S S
S S S C C S S S
S S S CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC S S S
S S S S S S
S S SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS S S
S S S S
S SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS S
S S
SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS
This is the exact same image, and the same data, as in the table output above, but it makes the nesting of the boxes more obvious.
Example of json output
json output$ C2PA_DEBUG_BOXES=json ./a.out image.jpg
{
"JUMBF box": "Super",
"children": [
{
"JUMBF box": "Super",
"children": [
{
"JUMBF box": "Super",
"children": [
{
"JUMBF box": "Super",
"children": [
{
"JUMBF box": "Content",
"size": 104,
"start": 271,
"type": "cbor"
}
],
"description": {
"JUMBF box": "Description",
"hasSalt": true,
"label": "com.truepic.libc2pa",
"size": 85,
"start": 186,
"type": "jumd"
},
"size": 197,
"start": 178,
"type": "jumb"
},
{
"JUMBF box": "Super",
"children": [
{
"JUMBF box": "Content",
"size": 128,
"start": 463,
"type": "cbor"
}
],
"description": {
"JUMBF box": "Description",
"hasSalt": true,
"label": "c2pa.hash.data",
"size": 80,
"start": 383,
"type": "jumd"
},
"size": 216,
"start": 375,
"type": "jumb"
}
],
"description": {
"JUMBF box": "Description",
"hasSalt": false,
"label": "c2pa.assertions",
"size": 41,
"start": 137,
"type": "jumd"
},
"size": 462,
"start": 129,
"type": "jumb"
},
{
"JUMBF box": "Super",
"children": [
{
"JUMBF box": "Content",
"size": 615,
"start": 635,
"type": "cbor"
}
],
"description": {
"JUMBF box": "Description",
"hasSalt": false,
"label": "c2pa.claim",
"size": 36,
"start": 599,
"type": "jumd"
},
"size": 659,
"start": 591,
"type": "jumb"
},
{
"JUMBF box": "Super",
"children": [
{
"JUMBF box": "Content",
"size": 25608,
"start": 1298,
"type": "cbor"
}
],
"description": {
"JUMBF box": "Description",
"hasSalt": false,
"label": "c2pa.signature",
"size": 40,
"start": 1258,
"type": "jumd"
},
"size": 25656,
"start": 1250,
"type": "jumb"
}
],
"description": {
"JUMBF box": "Description",
"hasSalt": false,
"label": "com.truepic:urn:uuid:9f9ce6fd-cc11-472d-91e9-f1821c27955c",
"size": 83,
"start": 46,
"type": "jumd"
},
"size": 26868,
"start": 38,
"type": "jumb"
}
],
"size": 26906,
"start": 0,
"type": "jumb"
}
This is the same information again, this time in JSON representation. Because of the ordering of the fields, this might be a bit difficult to parse visually, but it becomes a bit clearer when viewing in it in a JSON Parser that supports collapsible structures.
Dump the C2PA Signature
The C2PA Signature box can be dumped by setting the C2PA_DEBUG_SIGNATURE environment variable. This will produce 3 binary files in the current directory:
$ C2PA_DEBUG_SIGNATURE=ON ./a.out image.jpg
$ ls -l *.bin
-rw-r--r-- 1 dan staff 25600 Aug 10 15:05 signature_data.bin
-rw-r--r-- 1 dan staff 64 Aug 10 15:05 signature_digest.bin
-rw-r--r-- 1 dan staff 972 Aug 10 15:05 signature_structure.bin
These three files contain different "views" of the C2PA Signature:
signature_data.bin- This is the full CBOR contents of the Signature box. It is aCOSE_Sign1_Taggedstructure, as described in Section 14.2.2 of the C2PA specification.signature_digest.bin- This is the cryptographic signature over theSig_structure.signature_structure.bin- This is the CBORSig_structure, constructed as described in Section 14.2.3 of the C2PA specification.
The CBOR structures can be examined with the xxd command line tool in combination with a CBOR parser such as cbor-diag or the cbor.me web site.
Examine the COSE_Sign1_Tagged structure
COSE_Sign1_Tagged structure$ xxd -p signature_data.bin | cbor-diag
18([
h'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',
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"sigTst": {
"tstTokens": [
{
"val": h'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',
},
],
},
},
null,
h'116fc947a4087b922441f7716f4391390fcc3f032847a46bcdccf7cf1c0a83246a64296890a834c794dca521465476fa4feca23c0b92a77e5334878f95ea16b9',
])
According to the specifications, this data is:
protected- A byte array of more CBOR data.unprotected- A structure containing multiple elements:pad- Just used to pad the structure during creation, as described in the C2PA specification.sigTst- The TSA (time stamp) token.
payload- This is always empty (null) for C2PA.signature- This is the cryptographic signature, the same as thesignature_digest.binfile, in hexadecimal format.
The protected field can be further examined:
echo "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" | cbor-diag
{
1: -7,
33_0: h'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',
}
This has two fields in it:
1- This is the signature algorithm (alg). In this case, the value-7indicates ECDSA w/ SHA-256 (reference).33- This is the certificate chain, in DER format, represented as a hexadecimal string.
The certificate can be examined:
$ openssl x509 -inform DER -noout -text -in <(echo "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" | xxd -r -p)
Certificate:
Data:
Version: 1 (0x0)
Serial Number: 1 (0x1)
Signature Algorithm: ecdsa-with-SHA256
Issuer: C = US, O = Truepic, CN = localhost
Validity
Not Before: Jan 3 22:55:51 2022 GMT
Not After : Apr 13 22:55:51 2022 GMT
Subject: C = US, O = Truepic, CN = localhost
Subject Public Key Info:
Public Key Algorithm: id-ecPublicKey
Public-Key: (256 bit)
pub:
04:5e:fc:00:2e:9b:88:41:21:73:5c:46:57:e7:2a:
7d:a9:a7:70:82:47:d5:c2:4b:14:4e:3a:ef:5d:a2:
a0:68:d4:dc:b3:49:64:d9:a3:f0:bf:3f:09:42:ba:
7d:a6:5e:07:df:e0:25:55:e0:4f:8b:47:ea:fc:e6:
39:73:62:4f:aa
ASN1 OID: prime256v1
NIST CURVE: P-256
Signature Algorithm: ecdsa-with-SHA256
Signature Value:
30:46:02:21:00:9a:64:e5:c2:64:75:05:c8:03:f5:9d:bd:f4:
ab:ec:a5:f1:82:9e:db:b8:e3:71:e5:f7:ef:01:64:72:0c:c3:
7f:02:21:00:b7:1d:e0:97:45:fb:af:15:69:a0:2f:1f:1f:c5:
2d:02:c4:68:48:02:93:15:ba:90:7c:b9:2e:6f:0b:2d:76:46
The timestamp can also be examined:
$ openssl ts -reply -text -in <(echo "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" | xxd -r -p)
Using configuration from /opt/homebrew/etc/openssl@3/openssl.cnf
Status info:
Status: Granted.
Status description: unspecified
Failure info: unspecified
TST info:
Version: 1
Policy OID: 1.3.6.1.4.1.22408.1.2.3.45
Hash Algorithm: sha384
Message data:
0000 - 73 be 08 e3 95 8e 5e 95-1c 15 66 90 4a e5 a1 9a s.....^...f.J...
0010 - 84 aa 91 a7 6e 8e 55 6f-9d 13 06 4a ac 6d bb 89 ....n.Uo...J.m..
0020 - 3c b3 1e ba 99 cf 1b 36-9a 8f 57 56 35 5c ea 8f <......6..WV5\..
Serial number: 0x7A0C4D7D8D24EDA45FCDF5870E287418
Time stamp: Aug 10 16:39:32 2023 GMT
Accuracy: unspecified seconds, 0x01F4 millis, unspecified micros
Ordering: no
Nonce: unspecified
TSA: DirName:/C=US/O=Truepic/OU=Lens/CN=Truepic Lens Time-Stamping Authority
Extensions:
Examine the Sig_structure
Sig_structureThis structure is made up of many of the same parts as the COSE_Sign1_Tagged structure:
$ xxd -p signature_structure.bin | cbor-diag
[
"Signature1",
h'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',
h'',
h'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',
]
This contains:
context- AlwaysSignature1.body_protected- The same as theprotectedfield in theCOSE_Sign1_Taggedstructure.external_aad- Always empty.payload- This is the C2PA Claim structure.
The Claim can be examined:
$ echo "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" | cbor-di
ag
{
"alg": "sha256",
"assertions": [
{
"alg": "sha256",
"hash": h'd5cc63e54d5e88a9c5ae31cbfc6671307a4de3a5d9f87622070997007232a1af',
"url": "self#jumbf=/c2pa/com.truepic:urn:uuid:9f9ce6fd-cc11-472d-91e9-f1821c27955c/c2pa.assertions/com.truepic.libc2pa",
},
{
"alg": "sha256",
"hash": h'25b396aaa3c2969b44d981acadf2f818ac60b853848eb93f1edf5454b77a2363',
"url": "self#jumbf=/c2pa/com.truepic:urn:uuid:9f9ce6fd-cc11-472d-91e9-f1821c27955c/c2pa.assertions/c2pa.hash.data",
},
],
"claim_generator": "Bulk_C2PA_Tool/0.1.2 libc2pa/3.1.36",
"claim_generator_info": [{"name": "Bulk C2PA Tool", "version": "0.1.2"}],
"dc:format": "image/jpeg",
"dc:title": "",
"instanceID": "",
"signature": "self#jumbf=/c2pa/com.truepic:urn:uuid:9f9ce6fd-cc11-472d-91e9-f1821c27955c/c2pa.signature",
}
You can see that this structure has the same two assertions (com.truepic.libc2pa and c2pa.hash.data) as shown in the C2PA_DEBUG_BOXES output in the previous section.
Verify the signature
You can extract the public key from the certificate:
$ openssl x509 -inform DER -pubkey -noout -in <(echo "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" | xxd -r -p) | tee pubkey.pem
-----BEGIN PUBLIC KEY-----
MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEXvwALpuIQSFzXEZX5yp9qadwgkfV
wksUTjrvXaKgaNTcs0lk2aPwvz8JQrp9pl4H3+AlVeBPi0fq/OY5c2JPqg==
-----END PUBLIC KEY-----
Then you can use that public key to check the signature. Unfortunately, the ECDSA signature is a 64-byte r + s concatenated value in the C2PA signature, but the openssl tool expects the r and s values to be in a DER-encoded SEQUENCE. So we will need to do that first:
$ openssl asn1parse -genconf <(echo "asn1=SEQUENCE:ecdsa_signature\n\n[ecdsa_signature]\nfield1=INTEGER:0x$(xxd -p -c 32 signature_digest.bin | head -n 1)\nfield2=INTEGER:0x$(xxd -p -c 32 signature_digest.bin | tail -n 1)\n") -out signature_digest.der
0:d=0 hl=2 l= 68 cons: SEQUENCE
2:d=1 hl=2 l= 32 prim: INTEGER :116FC947A4087B922441F7716F4391390FCC3F032847A46BCDCCF7CF1C0A8324
36:d=1 hl=2 l= 32 prim: INTEGER :6A64296890A834C794DCA521465476FA4FECA23C0B92A77E5334878F95EA16B9
Now we can verify our signature:
$ openssl dgst -sha256 -verify pubkey.pem -signature signature_digest.der signature_structure.bin
Verified OK
Updated 3 months ago