Rust Requires Chilkat v11.0.0+

Verify a .p7m and get Algorithm Information

See more Digital Signatures Examples

Demonstrates how to verify a .p7m and then examine the algorithms used by the signature. Rust

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

let crypt = chilkat::Crypt2::new();

let in_file = "qa_data/p7m/brainpoolP256r1.p7m".to_string();
let out_file = "qa_output/something.dat".to_string();

// Verify and extract the signed data.
if crypt.verify_p7_m(&in_file, &out_file).is_err() {
    println!("{}", crypt.last_error_text());
    return;
}

// Examine details about the signature(s)
let json = chilkat::JsonObject::new();
crypt.get_last_json_data(&json);
json.set_emit_compact(false);
println!("{}", json.emit().unwrap_or_default());

// Sample output

// {
//   "pkcs7": {
//     "verify": {
//       "digestAlgorithms": [
//         "sha256"
//       ],
//       "signerInfo": [
//         {
//           "cert": {
//             "serialNumber": "FFFFE552B302FFFFFF1E34C3ACEB2FFFF",
//             "issuerCN": "The common name of the cert...",
//             "issuerDN": "",
//             "digestAlgOid": "2.16.840.1.101.3.4.2.1",
//             "digestAlgName": "SHA256"
//           },
//           "contentType": "1.2.840.113549.1.7.1",
//           "signingTime": "190409140500Z",
//           "messageDigest": "lQe9If7vZKFf/NlSYu5Esmlw3phVK/RFsbbb1uH73t8=",
//           "signingAlgOid": "1.2.840.10045.4.3.2",
//           "signerDigest": "lQe9If7vZKFf/NlSYu5Esmlw3phVK/RFsbbb1uH73t8=",
//           "authAttr": [
//             {
//               "oid": "1.2.840.113549.1.9.3",
//               "oidName": "contentType"
//             },
//             {
//               "oid": "1.2.840.113549.1.9.5",
//               "oidName": "signingTime"
//             },
//             {
//               "oid": "1.2.840.113549.1.9.52",
//               "oidName": "1.2.840.113549.1.9.52",
//               "der": "MBs ... AwI="
//             },
//             {
//               "oid": "1.2.840.113549.1.9.4",
//               "oidName": "messageDigest"
//             },
//             {
//               "oid": "1.2.840.113549.1.9.16.2.47",
//               "oidName": "signingCertificateV2",
//               "der": "MCYw .. 7PlQ=="
//             },
//             {
//               "oid": "1.2.840.113549.1.9.20",
//               "oidName": "1.2.840.113549.1.9.20"
//             }
//           ]
//         }
//       ]
//     }
//   }
// }

// Code for parsing the above JSON...
let mut i: i32 = 0;
let mut count_i: i32 = 0;
let mut j: i32 = 0;
let mut count_j: i32 = 0;

i = 0;
count_i = json.size_of_array("pkcs7.verify.digestAlgorithms");
while i < count_i {
    json.set_i(i);
    let _ = json.string_of("pkcs7.verify.digestAlgorithms[i]").unwrap_or_default();
    i = i + 1;
}

i = 0;
count_i = json.size_of_array("pkcs7.verify.signerInfo");
while i < count_i {
    json.set_i(i);
    let _ = json.string_of("pkcs7.verify.signerInfo[i].cert.serialNumber").unwrap_or_default();
    let _ = json.string_of("pkcs7.verify.signerInfo[i].cert.issuerCN").unwrap_or_default();
    let _ = json.string_of("pkcs7.verify.signerInfo[i].cert.issuerDN").unwrap_or_default();
    let _ = json.string_of("pkcs7.verify.signerInfo[i].cert.digestAlgOid").unwrap_or_default();
    let _ = json.string_of("pkcs7.verify.signerInfo[i].cert.digestAlgName").unwrap_or_default();
    let _ = json.string_of("pkcs7.verify.signerInfo[i].contentType").unwrap_or_default();
    let _ = json.string_of("pkcs7.verify.signerInfo[i].signingTime").unwrap_or_default();
    let _ = json.string_of("pkcs7.verify.signerInfo[i].messageDigest").unwrap_or_default();
    let _ = json.string_of("pkcs7.verify.signerInfo[i].signingAlgOid").unwrap_or_default();
    let _ = json.string_of("pkcs7.verify.signerInfo[i].signerDigest").unwrap_or_default();
    j = 0;
    count_j = json.size_of_array("pkcs7.verify.signerInfo[i].authAttr");
    while j < count_j {
        json.set_j(j);
        let _ = json.string_of("pkcs7.verify.signerInfo[i].authAttr[j].oid").unwrap_or_default();
        let _ = json.string_of("pkcs7.verify.signerInfo[i].authAttr[j].oidName").unwrap_or_default();
        let _ = json.string_of("pkcs7.verify.signerInfo[i].authAttr[j].der").unwrap_or_default();
        j = j + 1;
    }

    i = i + 1;
}

println!("Success!");