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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.
Chilkat Zig Downloads
const std = @import("std");
const chilkat = @import("chilkat");
pub fn main(init: std.process.Init) !void {
const alloc = init.arena.allocator();
// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.
const mime = try chilkat.Mime.init();
defer mime.deinit();
// Load the signed MIME from a file...
mime.loadMimeFile("qa_data/mime/detached_sig.eml") catch {
std.debug.print("{s}\n", .{try mime.getLastErrorText(alloc)});
return;
};
// Verify the S/MIME and restore the MIME
// to the structure/content it had prior to signing.
mime.verify() catch {
std.debug.print("{s}\n", .{try mime.getLastErrorText(alloc)});
return;
};
// Examine the details of what was verified.
const json = try chilkat.JsonObject.init();
defer json.deinit();
mime.getLastJsonData(json);
json.setEmitCompact(false);
std.debug.print("{s}\n", .{try json.emit(alloc)});
// 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
const signing_time = try chilkat.DtObj.init();
defer signing_time.deinit();
const auth_attr_signing_time_utctime = try chilkat.DtObj.init();
defer auth_attr_signing_time_utctime.deinit();
var issuer_cn: [:0]const u8 = "";
var serial: [:0]const u8 = "";
var str_val: [:0]const u8 = "";
var cert_serial_number: [:0]const u8 = "";
var cert_issuer_cn: [:0]const u8 = "";
var cert_digest_alg_oid: [:0]const u8 = "";
var cert_digest_alg_name: [:0]const u8 = "";
var content_type: [:0]const u8 = "";
var message_digest: [:0]const u8 = "";
var signing_alg_oid: [:0]const u8 = "";
var signing_alg_name: [:0]const u8 = "";
var auth_attr_content_type_name: [:0]const u8 = "";
var auth_attr_content_type_oid: [:0]const u8 = "";
var auth_attr_signing_time_name: [:0]const u8 = "";
var auth_attr_message_digest_name: [:0]const u8 = "";
var auth_attr_message_digest_digest: [:0]const u8 = "";
var auth_attr1_2_840_113549_1_9_15_der: [:0]const u8 = "";
var auth_attr1_3_6_1_4_1_311_16_4_der: [:0]const u8 = "";
var i: i32 = 0;
var count_i: i32 = json.sizeOfArray("pkcs7.verify.certs");
while (i < count_i) {
json.setI(i);
issuer_cn = try json.stringOf(alloc, "pkcs7.verify.certs[i].issuerCN");
serial = try json.stringOf(alloc, "pkcs7.verify.certs[i].serial");
i = i + 1;
}
i = 0;
count_i = json.sizeOfArray("pkcs7.verify.digestAlgorithms");
while (i < count_i) {
json.setI(i);
str_val = try json.stringOf(alloc, "pkcs7.verify.digestAlgorithms[i]");
i = i + 1;
}
i = 0;
count_i = json.sizeOfArray("pkcs7.verify.signerInfo");
while (i < count_i) {
json.setI(i);
cert_serial_number = try json.stringOf(alloc, "pkcs7.verify.signerInfo[i].cert.serialNumber");
cert_issuer_cn = try json.stringOf(alloc, "pkcs7.verify.signerInfo[i].cert.issuerCN");
cert_digest_alg_oid = try json.stringOf(alloc, "pkcs7.verify.signerInfo[i].cert.digestAlgOid");
cert_digest_alg_name = try json.stringOf(alloc, "pkcs7.verify.signerInfo[i].cert.digestAlgName");
content_type = try json.stringOf(alloc, "pkcs7.verify.signerInfo[i].contentType");
json.dtOf("pkcs7.verify.signerInfo[i].signingTime", false, signing_time) catch {};
message_digest = try json.stringOf(alloc, "pkcs7.verify.signerInfo[i].messageDigest");
signing_alg_oid = try json.stringOf(alloc, "pkcs7.verify.signerInfo[i].signingAlgOid");
signing_alg_name = try json.stringOf(alloc, "pkcs7.verify.signerInfo[i].signingAlgName");
auth_attr_content_type_name = try json.stringOf(alloc, "pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.3\".name");
auth_attr_content_type_oid = try json.stringOf(alloc, "pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.3\".oid");
auth_attr_signing_time_name = try json.stringOf(alloc, "pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.5\".name");
json.dtOf("pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.5\".utctime", false, auth_attr_signing_time_utctime) catch {};
auth_attr_message_digest_name = try json.stringOf(alloc, "pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.4\".name");
auth_attr_message_digest_digest = try json.stringOf(alloc, "pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.4\".digest");
auth_attr1_2_840_113549_1_9_15_der = try json.stringOf(alloc, "pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.15\".der");
auth_attr1_3_6_1_4_1_311_16_4_der = try json.stringOf(alloc, "pkcs7.verify.signerInfo[i].authAttr.\"1.3.6.1.4.1.311.16.4\".der");
i = i + 1;
}
}