Rust

Verify and Unwrap S/MIME, and get Information about CMS Signature

See more MIME Examples

Demonstrates calling the Verify method to verify and unwrap S/MIME. The MIME is restored to the original structure that it would have originally had prior to signing. The Verify method works with both detached signatures, as well as opaque/attached signatures.

Calls LastJsonData to get information about the signature(s) that were verified.

Rust

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

let mime = chilkat::Mime::new();

// Load the signed MIME from a file...
if mime.load_mime_file("qa_data/mime/detached_sig.eml").is_err() {
    println!("{}", mime.last_error_text());
    return;
}

// Verify the S/MIME and restore the MIME
// to the structure/content it had prior to signing.
if mime.verify().is_err() {
    println!("{}", mime.last_error_text());
    return;
}

// Examine the details of what was verified.
let json = chilkat::JsonObject::new();
mime.get_last_json_data(&json);

json.set_emit_compact(false);
println!("{}", json.emit().unwrap_or_default());

// The code to parse the following JSON (i.e. extract desired information) is shown below..

// {
//   "pkcs7": {
//     "verify": {
//       "certs": [
//         {
//           "issuerCN": "VeriSign Class 1 Public Primary Certification Authority - G3",
//           "serial": "0702A21A85B84B659E180A6EE6F5A365"
//         },
//         {
//           "issuerCN": "VeriSign Class 1 Public Primary Certification Authority - G3",
//           "serial": "008B5B75568454850B00CFAF3848CEB1A4"
//         },
//         {
//           "issuerCN": "Symantec Class 1 Individual Subscriber CA - G5",
//           "serial": "619C55C32FF6BD1A7B7E0330D21C8F3C"
//         }
//       ],
//       "digestAlgorithms": [
//         "sha1"
//       ],
//       "signerInfo": [
//         {
//           "cert": {
//             "serialNumber": "619C55C32FF6BD1A7B7E0330D21C8F3C",
//             "issuerCN": "Symantec Class 1 Individual Subscriber CA - G5",
//             "digestAlgOid": "1.3.14.3.2.26",
//             "digestAlgName": "SHA1"
//           },
//           "contentType": "1.2.840.113549.1.7.1",
//           "signingTime": "160428055000Z",
//           "messageDigest": "2hJJVmO/jtaJV5uCKMFzIkRRvtY=",
//           "signingAlgOid": "1.2.840.113549.1.1.1",
//           "signingAlgName": "RSA-PKCSV-1_5",
//           "authAttr": {
//             "1.2.840.113549.1.9.3": {
//               "name": "contentType",
//               "oid": "1.2.840.113549.1.7.1"
//             },
//             "1.2.840.113549.1.9.5": {
//               "name": "signingTime",
//               "utctime": "160428055000Z"
//             },
//             "1.2.840.113549.1.9.4": {
//               "name": "messageDigest",
//               "digest": "2hJJVmO/jtaJV5uCKMFzIkRRvtY="
//             },
//             "1.2.840.113549.1.9.15": {
//               "der": "MFAwCwYJYIZIAWUDBAECMAoGCCqGSIb3DQMHMA4GCCqGSIb3DQMCAgIAgDANBggqhkiG9w0DAgIBQDAHBgUrDgMCBzANBggqhkiG9w0DAgIBKA=="
//             },
//             "1.3.6.1.4.1.311.16.4": {
//               "der": "MIG7MIG...7fgMw0hyPPA=="
//             }
//           }
//         }
//       ]
//     }
//   }
// }

// Use this online tool to generate parsing code from sample JSON: 
// Generate Parsing Code from JSON

let signing_time = chilkat::DtObj::new();
let auth_attr_signing_time_utctime = chilkat::DtObj::new();

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

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.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.dt_of("pkcs7.verify.signerInfo[i].signingTime", false, &signing_time);
    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].signingAlgName").unwrap_or_default();
    let _ = json.string_of("pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.3\".name").unwrap_or_default();
    let _ = json.string_of("pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.3\".oid").unwrap_or_default();
    let _ = json.string_of("pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.5\".name").unwrap_or_default();
    let _ = json.dt_of("pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.5\".utctime", false, &auth_attr_signing_time_utctime);
    let _ = json.string_of("pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.4\".name").unwrap_or_default();
    let _ = json.string_of("pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.4\".digest").unwrap_or_default();
    let _ = json.string_of("pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.15\".der").unwrap_or_default();
    let _ = json.string_of("pkcs7.verify.signerInfo[i].authAttr.\"1.3.6.1.4.1.311.16.4\".der").unwrap_or_default();
    i = i + 1;
}