Java

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

See more Digital Signatures Examples

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

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    boolean 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..
    CkBinData bd = new CkBinData();
    success = bd.LoadFile("qa_data/p7s/sample.p7s");
    if (success != true) {
        System.out.println("Failed to load .p7s file.");
        return;
        }

    CkCrypt2 crypt = new CkCrypt2();

    //  Assuming this is a signature that contains the original data that was signed..
    success = crypt.OpaqueVerifyBd(bd);
    if (success == false) {
        System.out.println(crypt.lastErrorText());
        return;
        }

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

    json.put_EmitCompact(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="
    //          }
    //        ]
    //      }
    //    }
    //  }
    //  

    int i;
    int count_i;
    String strVal;
    String certSerialNumber;
    String certIssuerCN;
    String certIssuerDN;
    String certDigestAlgOid;
    String certDigestAlgName;
    String contentType;
    String signingTime;
    String messageDigest;
    String signingAlgOid;
    String signerDigest;
    CkDateTime dt = new CkDateTime();

    i = 0;
    count_i = json.SizeOfArray("pkcs7.verify.digestAlgorithms");
    while (i < count_i) {
        json.put_I(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.put_I(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.
        success = 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.");
  }
}