Java Requires Chilkat v11.0.0+

Validate a .pkpass Archive

See more Digital Signatures Examples

Opens a .pkpass archive (which is just a .zip renamed to .pkpass) and validates the contents. The hashes in the manifest are compared with the computed hash values for each individual file. If all computed hash values match, then the signature is verified. Chilkat2 Java

import com.chilkatsoft.chilkat2.BinData;
import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.Crypt2;
import com.chilkatsoft.chilkat2.JsonObject;
import com.chilkatsoft.chilkat2.StringBuilder;
import com.chilkatsoft.chilkat2.Zip;
import com.chilkatsoft.chilkat2.ZipEntry;

public class ChilkatExample {

    public static void main(String[] args) {
        boolean success = false;

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

        Crypt2 crypt = new Crypt2();
        Zip zip = new Zip();

        try {
            zip.openZip("qa_data/pkpass/invalid.pkpass");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Get the contents of the manifest.json file, which contains something like this:

        // {
        //   "icon.png" : "0296b01347b3173e98438a003b0e88986340b2d8",
        //   "logo.png" : "25de09e2d3b01ce1fe00c2ca9a90a2be1aaa05cf",
        //   "icon@2x.png" : "5afd9585b08c65fdf105a90c8bd643407cba2787",
        //   "pass.json" : "145ea5a5db784fff485126c77ecf7a1fc2a88ee7",
        //   "strip@2x.png" : "468fa7bc93e6b55342b56fda09bdce7c829d7d46",
        //   "strip.png" : "736d01f84cb73d06e8a9932e43076d68f19461ff"
        // }

        ZipEntry ent = new ZipEntry();
        success = zip.entryOf("manifest.json", ent);
        if (!success) {
            System.out.println(zip.getLastErrorText());
            return;
        }

        // Get the exact content of the manifest.json for later signature verification.
        BinData bdManifest = new BinData();
        ent.unzipToBd(bdManifest);

        JsonObject json = new JsonObject();
        json.setEmitCompact(false);
        json.load(ent.unzipToString(0, "utf-8"));
        System.out.println(json.emit());

        // For each file in the JSON, get the filename and hex hash value.
        crypt.setEncodingMode("hexlower");
        crypt.setHashAlgorithm("sha1");

        boolean someHashesFailed = false;
        String filename = "";
        StringBuilder sbHashHex = new StringBuilder();
        BinData bdFileData = new BinData();
        int numMembers = json.getSize();
        int i = 0;
        while (i < numMembers) {
            filename = json.nameAt(i);
            sbHashHex.clear();
            sbHashHex.append(json.stringAt(i));

            success = zip.entryOf(filename, ent);
            if (!success) {
                System.out.println(zip.getLastErrorText());
                return;
            }

            // Get the data for this file.
            bdFileData.clear();
            ent.unzipToBd(bdFileData);

            String computedHashHex = crypt.hashBdENC(bdFileData);
            if (!sbHashHex.contentsEqual(computedHashHex, false)) {
                System.out.println("Computed hash does not match stored hash for " + filename);
                System.out.println("  computed: " + computedHashHex);
                System.out.println("  stored:   " + sbHashHex.getAsString());
                someHashesFailed = true;
            } else {
                System.out.println("hash verified for " + filename + "(" + computedHashHex + ")");
            }

            i = i + 1;
        }

        if (someHashesFailed) {
            System.out.println("Some hashes failed.");
            return;
        }

        // Let's verify the signature..
        // First get the signature.
        success = zip.entryOf("signature", ent);
        if (!success) {
            System.out.println(zip.getLastErrorText());
            return;
        }

        BinData bdSignature = new BinData();
        ent.unzipToBd(bdSignature);

        // Show the contents of the signature in base64 encoding.
        System.out.println("Signature:");
        System.out.println(bdSignature.getEncoded("base64_mime"));
        System.out.println("----");

        // Verify the signature against the manifest.json
        crypt.setEncodingMode("base64");
        boolean verified;
        try {
            crypt.verifyBdENC(bdManifest, bdSignature.getEncoded("base64"));
            verified = true;
        } catch (ChilkatException e) {
            verified = false;
        }
        if (!verified) {
            System.out.println(crypt.getLastErrorText());
        }

        System.out.println("signature verified = " + verified);
    }
}