Hello, I am trying to parse a CMS message (attached below) - please bear with me as I'm not an expert on this.
I've written code as follows:
use std::fs::read;
use cms::{cert::x509::der::Decode, signed_data::SignedData};
fn main() {
let cms_string = read("test.pem").unwrap();
let (_, cms_der) = pem_rfc7468::decode_vec(&cms_string).unwrap();
let cms = SignedData::from_der(&cms_der).unwrap();
}
However, I get an panic, as follows:
thread 'main' panicked at src/main.rs:7:46:
called `Result::unwrap()` on an `Err` value: Error { kind: TagUnexpected { expected: Some(Tag(0x02: INTEGER)), actual: Tag(0x06: OBJECT IDENTIFIER) }, position: Some(Length(2)) }
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
However, reading this file using the openssl CLI works fine:
user@pc ~ $ openssl cms -cmsout -inform PEM -in test.pem -noout -print
CMS_ContentInfo:
contentType: pkcs7-signedData (1.2.840.113549.1.7.2)
d.signedData:
version: 3
...
How can I parse this CMS message in Rust? Am I doing something wrong or is this not part of RustCrypto CMS yet?
Thanks
CMS message
-----BEGIN CMS-----
MIIXFwYJKoZIhvcNAQcCoIIXCDCCFwQCAQMxDzANBglghkgBZQMEAgEFADCCAVwG
CyqGSIb3DQEJEAEEoIIBSwSCAUcwggFDAgEBBgorBgEEAYRZCgMBMDEwDQYJYIZI
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-----END CMS-----