Unicode C

P7S - Access Signature Information (date/time, certificate used, etc.)

See more Digital Signatures Examples

Examine a PKCS7 signature (.p7s) and get information about it. Unicode C

#include <C_CkBinDataW.h>
#include <C_CkCrypt2W.h>
#include <C_CkJsonObjectW.h>
#include <C_CkDateTimeW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkBinDataW bd;
    HCkCrypt2W crypt;
    HCkJsonObjectW json;
    int i;
    int count_i;
    const wchar_t *strVal;
    const wchar_t *certSerialNumber;
    const wchar_t *certIssuerCN;
    const wchar_t *certIssuerDN;
    const wchar_t *certDigestAlgOid;
    const wchar_t *certDigestAlgName;
    const wchar_t *contentType;
    const wchar_t *signingTime;
    const wchar_t *messageDigest;
    const wchar_t *signingAlgOid;
    const wchar_t *signerDigest;
    HCkDateTimeW dt;

    success = FALSE;

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

    // First load the .p7s file into a BinData object..
    bd = CkBinDataW_Create();
    success = CkBinDataW_LoadFile(bd,L"qa_data/p7s/sample.p7s");
    if (success != TRUE) {
        wprintf(L"Failed to load .p7s file.\n");
        CkBinDataW_Dispose(bd);
        return;
    }

    crypt = CkCrypt2W_Create();

    // Assuming this is a signature that contains the original data that was signed..
    success = CkCrypt2W_OpaqueVerifyBd(crypt,bd);
    if (success == FALSE) {
        wprintf(L"%s\n",CkCrypt2W_lastErrorText(crypt));
        CkBinDataW_Dispose(bd);
        CkCrypt2W_Dispose(crypt);
        return;
    }

    // Examine the last JSON data after signature verification..
    json = CkJsonObjectW_Create();
    CkCrypt2W_GetLastJsonData(crypt,json);

    CkJsonObjectW_putEmitCompact(json,FALSE);
    wprintf(L"%s\n",CkJsonObjectW_emit(json));

    // Sample output...
    // Go to http://tools.chilkat.io/jsonParse.cshtml
    // and paste the JSON into the online form to generate JSON parsing code.

    // {
    //   "pkcs7": {
    //     "verify": {
    //       "digestAlgorithms": [
    //         "sha256"
    //       ],
    //       "signerInfo": [
    //         {
    //           "cert": {
    //             "serialNumber": "AAC5FC48C0FD8FBB",
    //             "issuerCN": "AC ABCDEF RFB v5",
    //             "issuerDN": "",
    //             "digestAlgOid": "2.16.840.1.101.3.4.2.1",
    //             "digestAlgName": "SHA-256"
    //           },
    //           "contentType": "1.2.840.113549.1.7.1",
    //           "signingTime": "180607195054Z",
    //           "messageDigest": "trzyxXbZ96z2M4mncyZ7BNMV4yIT92+5sS27Fu64iG8=",
    //           "signingAlgOid": "1.2.840.113549.1.1.11",
    //           "signerDigest": "trzyxXbZ96z2M4mncyZ7BNMV4yIT92+5sS27Fu64iG8="
    //         },
    //         {
    //           "cert": {
    //             "serialNumber": "324FB38ABD59723F",
    //             "issuerCN": "AC ABCDEF RFB v5",
    //             "issuerDN": "",
    //             "digestAlgOid": "2.16.840.1.101.3.4.2.1",
    //             "digestAlgName": "SHA-256"
    //           },
    //           "contentType": "1.2.840.113549.1.7.1",
    //           "signingTime": "180608182517Z",
    //           "messageDigest": "trzyxXbZ96z2M4mncyZ7BNMV4yIT92+5sS27Fu64iG8=",
    //           "signingAlgOid": "1.2.840.113549.1.1.11",
    //           "signerDigest": "trzyxXbZ96z2M4mncyZ7BNMV4yIT92+5sS27Fu64iG8="
    //         }
    //       ]
    //     }
    //   }
    // }
    // 

    dt = CkDateTimeW_Create();

    i = 0;
    count_i = CkJsonObjectW_SizeOfArray(json,L"pkcs7.verify.digestAlgorithms");
    while (i < count_i) {
        CkJsonObjectW_putI(json,i);
        strVal = CkJsonObjectW_stringOf(json,L"pkcs7.verify.digestAlgorithms[i]");
        i = i + 1;
    }

    i = 0;
    count_i = CkJsonObjectW_SizeOfArray(json,L"pkcs7.verify.signerInfo");
    while (i < count_i) {
        CkJsonObjectW_putI(json,i);
        certSerialNumber = CkJsonObjectW_stringOf(json,L"pkcs7.verify.signerInfo[i].cert.serialNumber");
        certIssuerCN = CkJsonObjectW_stringOf(json,L"pkcs7.verify.signerInfo[i].cert.issuerCN");
        certIssuerDN = CkJsonObjectW_stringOf(json,L"pkcs7.verify.signerInfo[i].cert.issuerDN");
        certDigestAlgOid = CkJsonObjectW_stringOf(json,L"pkcs7.verify.signerInfo[i].cert.digestAlgOid");
        certDigestAlgName = CkJsonObjectW_stringOf(json,L"pkcs7.verify.signerInfo[i].cert.digestAlgName");
        contentType = CkJsonObjectW_stringOf(json,L"pkcs7.verify.signerInfo[i].contentType");
        signingTime = CkJsonObjectW_stringOf(json,L"pkcs7.verify.signerInfo[i].signingTime");

        // The signingTime isin UTCTime format.
        // UTCTime values take the form of either "YYMMDDhhmm[ss]Z" or "YYMMDDhhmm[ss](+|-)hhmm"
        // Starting in Chilkat v9.5.0.77, the SetFromTimestamp method auto-recognizes the UTCTime format and parses it correctly.
        success = CkDateTimeW_SetFromTimestamp(dt,signingTime);
        // To get the signingTime in other date/time formats, look at the online reference documentation for CkDateTime.
        // There are numerous methods such as GetAsDateTime, GetAsIso8601, GetAsUnixTime, GetAsRfc822, etc.

        messageDigest = CkJsonObjectW_stringOf(json,L"pkcs7.verify.signerInfo[i].messageDigest");
        signingAlgOid = CkJsonObjectW_stringOf(json,L"pkcs7.verify.signerInfo[i].signingAlgOid");
        signerDigest = CkJsonObjectW_stringOf(json,L"pkcs7.verify.signerInfo[i].signerDigest");
        i = i + 1;
    }

    // println crypt.LastErrorText;
    wprintf(L"Success.\n");


    CkBinDataW_Dispose(bd);
    CkCrypt2W_Dispose(crypt);
    CkJsonObjectW_Dispose(json);
    CkDateTimeW_Dispose(dt);

    }