Unicode C++

Verify a CAdES-BES Signature and Examine Signature Contents

See more Digital Signatures Examples

Demonstrates how to validate a .p7m (.p7s) signature and examine the contents of the signature. Unicode C++

#include <CkCrypt2W.h>
#include <CkJsonObjectW.h>
#include <CkDtObjW.h>

void ChilkatSample(void)
    {
    bool success = false;

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

    CkCrypt2W crypt;

    const wchar_t *outputFile = L"qa_output/original.xml";
    const wchar_t *inFile = L"qa_data/p7m/fattura_signature.xml.p7m";

    //  Verify the signature and extract the contained file, which in this case is XML.
    success = crypt.VerifyP7M(inFile,outputFile);
    if (success == false) {
        wprintf(L"%s\n",crypt.lastErrorText());
        return;
    }

    wprintf(L"Signature validated.\n");

    //  Now let's examine the information about the signature.
    CkJsonObjectW json;
    crypt.GetLastJsonData(json);

    json.put_EmitCompact(false);
    wprintf(L"%s\n",json.emit());

    //  Here's an example of the information about the signature:
    //  {
    //    "pkcs7": {
    //      "verify": {
    //        "certs": [
    //          {
    //            "issuerCN": "Xyz EU Qualified Certificates CA G1",
    //            "serial": "99A28A51AC389999"
    //          }
    //        ],
    //        "useConstructedOctets": true,
    //        "digestAlgorithms": [
    //          "sha256"
    //        ],
    //        "signerInfo": [
    //          {
    //            "cert": {
    //              "subjectKeyIdentifier": "5VM4x8AWnXf07yzbXuLtbb0U3yY=",
    //              "digestAlgOid": "2.16.840.1.101.3.4.2.1",
    //              "digestAlgName": "SHA256"
    //            },
    //            "signingAlgOid": "1.2.840.113549.1.1.11",
    //            "signingAlgName": "RSA-SHA256-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": "190901152340Z"
    //              },
    //              "1.2.840.113549.1.9.4": {
    //                "name": "messageDigest",
    //                "digest": "y+gd/zAQK33A//HInhaZba7w1fUJleV9AHbP1Ntx6U0="
    //              },
    //              "1.2.840.113549.1.9.16.2.47": {
    //                "name": "signingCertificateV2",
    //                "der": "MIH4MI..w4vv0="
    //              }
    //            }
    //          }
    //        ]
    //      }
    //    }
    //  }

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

    //  Chilkat functions returning "const char *" return a pointer to temporary internal memory owned and managed by Chilkat.
    //  See this example explaining how this memory should be used: const char * functions.

    CkDtObjW authAttrSigningTimeUtctime;
    const wchar_t *issuerCN = 0;
    const wchar_t *serial = 0;
    const wchar_t *strVal = 0;
    const wchar_t *certSubjectKeyIdentifier = 0;
    const wchar_t *certDigestAlgOid = 0;
    const wchar_t *certDigestAlgName = 0;
    const wchar_t *signingAlgOid = 0;
    const wchar_t *signingAlgName = 0;
    const wchar_t *authAttrContentTypeName = 0;
    const wchar_t *authAttrContentTypeOid = 0;
    const wchar_t *authAttrSigningTimeName = 0;
    const wchar_t *authAttrMessageDigestName = 0;
    const wchar_t *authAttrMessageDigestDigest = 0;
    const wchar_t *authAttrSigningCertificateV2Name = 0;
    const wchar_t *authAttrSigningCertificateV2Der = 0;

    int i = 0;
    int count_i = json.SizeOfArray(L"pkcs7.verify.certs");
    while (i < count_i) {
        json.put_I(i);
        issuerCN = json.stringOf(L"pkcs7.verify.certs[i].issuerCN");
        serial = json.stringOf(L"pkcs7.verify.certs[i].serial");
        i = i + 1;
    }

    i = 0;
    count_i = json.SizeOfArray(L"pkcs7.verify.digestAlgorithms");
    while (i < count_i) {
        json.put_I(i);
        strVal = json.stringOf(L"pkcs7.verify.digestAlgorithms[i]");
        i = i + 1;
    }

    i = 0;
    count_i = json.SizeOfArray(L"pkcs7.verify.signerInfo");
    while (i < count_i) {
        json.put_I(i);
        certSubjectKeyIdentifier = json.stringOf(L"pkcs7.verify.signerInfo[i].cert.subjectKeyIdentifier");
        certDigestAlgOid = json.stringOf(L"pkcs7.verify.signerInfo[i].cert.digestAlgOid");
        certDigestAlgName = json.stringOf(L"pkcs7.verify.signerInfo[i].cert.digestAlgName");
        signingAlgOid = json.stringOf(L"pkcs7.verify.signerInfo[i].signingAlgOid");
        signingAlgName = json.stringOf(L"pkcs7.verify.signerInfo[i].signingAlgName");
        authAttrContentTypeName = json.stringOf(L"pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.3\".name");
        authAttrContentTypeOid = json.stringOf(L"pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.3\".oid");
        authAttrSigningTimeName = json.stringOf(L"pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.5\".name");
        json.DtOf(L"pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.5\".utctime",false,authAttrSigningTimeUtctime);
        authAttrMessageDigestName = json.stringOf(L"pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.4\".name");
        authAttrMessageDigestDigest = json.stringOf(L"pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.4\".digest");
        authAttrSigningCertificateV2Name = json.stringOf(L"pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.16.2.47\".name");
        authAttrSigningCertificateV2Der = json.stringOf(L"pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.16.2.47\".der");
        i = i + 1;
    }
    }