How do I sign the signature string of PCKS1 when I already know it?

Aspose.PDF Product Family
1

How do I sign the signature string of PCKS1 when I already know it?

this is Base64.getEncoder().encodeToString(byte[]) created,How use it to ?

Sw0WzJmleKGFcv9Dpe/z/4NMfndjJbhVYU3niDxzL0UK4ACtYKNA35stPUQ2R8jnLDh+Dn6Yg4NRCJilZv0gKzNcVkaoymPjR2ChZTUSLpAI+h9w+G2VMstgfL5bkoSBvAyogmmnzUD+Rho2+BbHOLFABsig7Z6r+ay/2UDC4JJVxjCXT4HY089/FNeDYeW+D/zooEJnrt7pb4YrolzvjBC3SXKVMcWnB/k1BmS6V1Hlv+yAvc/MqbjEGSttiL9CeNSXUVkjySbzMzGLfvpoiYcI0NXqsJwepnSc6ths/ZuGScDTnH3bR5dO7aSBdYa6tqzwrM3hLQWAxxEBndykuA==

I should use this method setCustomSignHash（Signature.SignHash 值） ？，but my Aspose.PDF for java version is 23.9,I could not find this method,How should I do ?

2

@zulin

Please spare us little time as we are collecting the related information and will share it with you soon.

3

Ok I writing for your good news

4

@zulin

We have opened the following new ticket(s) in our internal issue tracking system and will perform investigation for your rquirements.

Issue ID(s): PDFJAVA-43530

We will let you know as soon as it is resolved. Please spare us some time.

5

@zulin

We don’t have such functionality for PCKS1. We recommend to use PCKS7. Please check if below code snippet helps:

PdfFileSignature sign = new PdfFileSignature();
sign.bindPdf("inputPdf.pdf");

PKCS7 pkcs7 = new PKCS7("inputP12.p12", "inputPfxPassword");
com.aspose.pdf.Signature.SignHash signHashDelegate = pkcs7.new SignHash() {
    @Override
    public byte[] invoke(byte[] signableHash) {
        try {
            // Load the P12 certificate
            KeyStore keyStore = KeyStore.getInstance("PKCS12");
            try (FileInputStream fis = new FileInputStream("inputP12.p12")) {
                keyStore.load(fis, "inputPfxPassword".toCharArray());
            }

            // Get the certificate and private key
            String alias = keyStore.aliases().nextElement();
            Certificate cert = keyStore.getCertificate(alias);
            PrivateKey privateKey = (PrivateKey) keyStore.getKey(alias, "inputPfxPassword".toCharArray());

            // Create a Signature object with SHA1 algorithm
            java.security.Signature signature =  java.security.Signature.getInstance("SHA1withRSA");
            signature.initSign(privateKey);

            // Update the signature with the data to be signed
            signature.update(signableHash);

            // Generate the signature
            return signature.sign();
        } catch (Exception e) {
            // Log the exception
            throw new RuntimeException(e);
        }
    }
};
pkcs7.setCustomSignHash(signHashDelegate);

sign.sign(1, "reason", "cont", "loc", false, new java.awt.Rectangle(0, 0, 500, 500), pkcs7);
sign.save("outputPdf.pdf");
6

1 I do’t hava a .p12 file and pfx password,so that I can’t finish this signature for my pdf…

7

image.jpg (142.7 KB)
my Asponse.pdf version is 23.9 ,could find com.aspose.pdf.Signature.SignHash this class,should i update version to latest version？

8

I find method in latest version ,ok

9

@zulin

Yes, the method is available in the latest version and we always recommend using the latest version of the API. Nevertheless, please let us know in case you still have any concerns.