Java Requires Chilkat v11.0.0+

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

See more Digital Signatures Examples

Examine a PKCS7 signature (.p7s) and get information about it. Chilkat2 Java

import com.chilkatsoft.chilkat2.BinData;
import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.Crypt2;
import com.chilkatsoft.chilkat2.DateTime;
import com.chilkatsoft.chilkat2.JsonObject;

public class ChilkatExample {

    public static void main(String[] args) {
        // 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..
        BinData bd = new BinData();
        try {
            bd.loadFile("qa_data/p7s/sample.p7s");
        } catch (ChilkatException e) {
            System.out.println("Failed to load .p7s file.");
            return;
        }

        Crypt2 crypt = new Crypt2();

        // Assuming this is a signature that contains the original data that was signed..
        try {
            crypt.opaqueVerifyBd(bd);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Examine the last JSON data after signature verification..
        JsonObject json = new JsonObject();
        crypt.getLastJsonData(json);

        json.setEmitCompact(false);
        System.out.println(json.emit());

        // 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="
        //         }
        //       ]
        //     }
        //   }
        // }
        //

        String strVal = "";
        String certSerialNumber = "";
        String certIssuerCN = "";
        String certIssuerDN = "";
        String certDigestAlgOid = "";
        String certDigestAlgName = "";
        String contentType = "";
        String signingTime = "";
        String messageDigest = "";
        String signingAlgOid = "";
        String signerDigest = "";
        DateTime dt = new DateTime();

        int i = 0;
        int count_i = json.sizeOfArray("pkcs7.verify.digestAlgorithms");
        while (i < count_i) {
            json.setI(i);
            strVal = json.stringOf("pkcs7.verify.digestAlgorithms[i]");
            i = i + 1;
        }

        i = 0;
        count_i = json.sizeOfArray("pkcs7.verify.signerInfo");
        while (i < count_i) {
            json.setI(i);
            certSerialNumber = json.stringOf("pkcs7.verify.signerInfo[i].cert.serialNumber");
            certIssuerCN = json.stringOf("pkcs7.verify.signerInfo[i].cert.issuerCN");
            certIssuerDN = json.stringOf("pkcs7.verify.signerInfo[i].cert.issuerDN");
            certDigestAlgOid = json.stringOf("pkcs7.verify.signerInfo[i].cert.digestAlgOid");
            certDigestAlgName = json.stringOf("pkcs7.verify.signerInfo[i].cert.digestAlgName");
            contentType = json.stringOf("pkcs7.verify.signerInfo[i].contentType");
            signingTime = json.stringOf("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.
            dt.setFromTimestamp(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 = json.stringOf("pkcs7.verify.signerInfo[i].messageDigest");
            signingAlgOid = json.stringOf("pkcs7.verify.signerInfo[i].signingAlgOid");
            signerDigest = json.stringOf("pkcs7.verify.signerInfo[i].signerDigest");
            i = i + 1;
        }

        // println crypt.LastErrorText;
        System.out.println("Success.");
    }
}