signature

问题 We're using iText to put a text inside a signature placeholder in a PDF. We use a code snippet similar to this to define the Signature Appearence PdfStamper stp = PdfStamper.createSignature(inputReader, os, '\0', tempFile2, true); sap = stp.getSignatureAppearance(); sap.setVisibleSignature(placeholder); sap.setRenderingMode(PdfSignatureAppearance.RenderingMode.DESCRIPTION); sap.setCertificationLevel(PdfSignatureAppearance.NOT_CERTIFIED); Calendar cal = Calendar.getInstance(); sap.setSignDate

问题 I've two pdf documents certified (signed and validated with the same mechanism based on Itext 7 ) and when i use adobe reader DC to check their validity, only one has the green mark. the good one: https://1drv.ms/b/s!AkF6t4TavwMvgxWaidlUqvPvHH1r the bad one: https://1drv.ms/b/s!AkF6t4TavwMvgxQCMdGY61S1EvUh Regards David L 回答1: This is not an Adobe bug, it's a feature. (And an iText bug) When Adobe performs the cryptographic validation, it will also perform additional checks to see if a

问题 I would like to call a method from an dll, but i don't have the source neither the header file. I tried to use the dumpbin /exports to see the name of the method, but i can found the methods signature? Is there any way to call this method? Thanks, 回答1: It is possible to figure out a C function signature by analysing beginnig of its disassembly. The function arguments will be on the stack and the function will do some "pops" to read them in reverse order. You will not find the argument names,

问题 Is it possible to extract the visible signature (image) of an signed PDF with the OSS library PDFBox? Workflow: list all signatures of a file show which signatures include a visible signature show which are valid extract images of signatures (need to extract correct image for each signature) Something in oop style like following would be awesome: PDFSignatures [] sigs = document.getPDFSignatures() sig[0].getCN() ... (Buffered)Image visibleSig = sig[0].getVisibleSignature() Found class

问题 Is there a way to determine programmatically if the currently running app was built and signed for development only or whether it was built for distribution? And can one determine if was build for app store or ad hoc distribution? Is it e.g. possibly to access the code signature and get the information from there? Or are there certain files present in one of variants that don't exist in the other ones? Is part of the bundle info? Or can it be derived from the executable file? Any hints are

问题 I am using following statement to create a RSA public and private key. openssl genrsa -out ksign_private.pem 1024 openssl rsa -in ksign_private.pem -pubout > ksign_public.pem Then I have program that uses, PEM_read_RSAPrivateKey, EVP_PKEY_assign_RSA, EVP_SignInit, EVP_SignUpdate, EVP_SignFinal functions from openssl libcrypto to generate signature file. I also have routine that verifies that signature can be verified using PEM_read_RSA_PUBKEY, EVP_PKEY_assign_RSA, EVP_VerifyInit, EVP

问题 class NewClass{ public static void main(String a){ System.out.print("Hello"); } } When I'm trying to execute above code, then it shows an error, main method not found . But when I changed public static void main(String a) to public static void main(String... a) or public static void main(String a[]) . Then, it works..!! So, My question is how many different ways we can write legal main method signature and what this signature public static void main(String... a) means ? 回答1: Simply because

问题 class NewClass{ public static void main(String a){ System.out.print("Hello"); } } When I'm trying to execute above code, then it shows an error, main method not found . But when I changed public static void main(String a) to public static void main(String... a) or public static void main(String a[]) . Then, it works..!! So, My question is how many different ways we can write legal main method signature and what this signature public static void main(String... a) means ? 回答1: Simply because

问题 I'm wanting to sign a jar using jarsigner, then verify it using a Java application which does not have the signed jar as part of it's classpath (i.e. just using a filesystem location of the jar) Now my problem is getting the signature file out of the jar, is there a simple way to do this? I've had a play with the Inflater and Jar InputStreams with no luck. Or is this something that can be accomplished in a better way? Thanks 回答1: The security Provider implementation guide outlines the process

问题 Please select at least one of the signature versions to use in Android Studio 2.3 Now while generating signed apk in Android Studio, it's showing two options(CheckBox) namely 1. V1(Jar Signature) and 2. `V2(Full APK Signature)' as Signature Versions in last step of signed apk generating process. So, what is the difference between these V1(Jar Signature) and V2(Full APK Signature) in new Android Studio update? And which should I use(or both) for signing apk for play store release? Also I'm