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(Java) Extract PKCS7 Signature Digest

Demonstrates how to extract a signature digest from a PKCS7 signature.

Chilkat Java Downloads

Java Libs for Windows, Linux, Alpine Linux,
MAC OS X, Solaris, FreeBSD, OpenBSD,
Raspberry Pi and other single board computers

Java Libs for Android

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[])
  {
    // This example requires the Chilkat Crypt API to have been previously unlocked.
    // See Unlock Chilkat Crypt for sample code.

    CkCrypt2 crypt = new CkCrypt2();

    String p7mFile = "qa_data/p7m/test.pdf.p7m";
    String outPath = "qa_output/test.pdf";

    // First let's see if this .p7m signature can be verified, and the original file extracted.
    boolean verified = crypt.VerifyP7M(p7mFile,outPath);
    if (verified != true) {
        System.out.println(crypt.lastErrorText());
        return;
        }

    // How many signers?
    // (The NumSignerCerts property is set whenever a signature is verified.)
    System.out.println("Num Signers: " + crypt.get_NumSignerCerts());

    // Load the .p7m into memory...
    CkBinData pkcs7Data = new CkBinData();
    pkcs7Data.LoadFile(p7mFile);

    // Check to see if this .p7m contains the binary bytes, or if it's
    // already base64 encoded.  Get the 1st two bytes.  If the first two 
    // bytes are the us-ascii values "MI", then we have base64.
    CkStringBuilder sbBase64 = new CkStringBuilder();
    String hexStr = pkcs7Data.getEncodedChunk(0,2,"hex");
    sbBase64.Append(hexStr);

    boolean bHaveBase64 = false;
    if (sbBase64.ContentsEqual("4D49",true) == true) {
        bHaveBase64 = true;
        sbBase64.Clear();
        sbBase64.AppendBd(pkcs7Data,"utf-8",0,0);
        }

    // Get each signer's signature digest.
    crypt.put_EncodingMode("base64");
    int i = 0;
    String digest;
    while (i < crypt.get_NumSignerCerts()) {
        if (bHaveBase64) {
            digest = crypt.pkcs7ExtractDigest(i,sbBase64.getAsString());
            }
        else {
            digest = crypt.pkcs7ExtractDigest(i,pkcs7Data.getEncoded("base64"));
            }

        if (crypt.get_LastMethodSuccess() != true) {
            System.out.println(crypt.lastErrorText());
            return;
            }

        System.out.println("Signer " + (i+1) + " digest = " + digest);
        i = i+1;
        }
  }
}

 

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