signature | 易学教程

How to show digital PDF signature in all document's Page using iText?

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问题 I've been working on a digital signature function for some days, now that I have everything working it is time to try to print the stamp in all pages but I'm not doing great... Trying to give a quick resume, to show the stamp what I do is creating PdfStamper, PdfSignatureAppearance and a Rectangle, then call the appearance.setVisibleSignature(rectangle, 1, "SIGNATURE") The second parameter "1" above is the page number that I want to show the stamp, it is okay to be 1 by now, as I tried to do

Can the arguments of main's signature in C++ have the unsigned and const qualifiers? [duplicate]

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This question already has an answer here: What should main() return in C and C++? 17 answers The standard explicitly states that main has two valid (i.e., guaranteed to work) signatures; namely: int main(); int main(int, char*[]); My question is simple, would something like the following be legal? int main(const unsigned int, const char* const* argv); My tests say 'yes', but I'm unsure of the answer because am I not overloading main by changing int to unsigned int as well as the non top-level const -ness of argv? If I am, then that's clearly prohibited. So, are these modifications guaranteed

SAML: Why is the certificate within the Signature?

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问题 I have to implement SSO with SAML for my company\'s website (as the relying party). An essential part off course is the verification of the signature. Here is the signature part of a sample SAML from our partner company (asserting party): <ds:Signature xmlns:ds=\"http://www.w3.org/2000/09/xmldsig#\"> <ds:SignedInfo xmlns:ds=\"http://www.w3.org/2000/09/xmldsig#\"> <ds:CanonicalizationMethod Algorithm=\"http://www.w3.org/2001/10/xml-exc-c14n#\" xmlns:ds=\"http://www.w3.org/2000/09/xmldsig#\"/>

Digital signature in c# without using BouncyCastle

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问题 Without using 3rd party BouncyCastle library, is there a way to read a custom private key and sign the message ? (sha256 hash+encryption using private key) 回答1: Technically, yes. Depending on what kind of key you have the answer gets more tricky. Edit (2019-Oct): .NET Core 3.0 has built-in support for all of these formats, in their DER-encoded (vs PEM-encoded) forms. I'm adding the .NET Core 3.0+ answers after a sub-heading within each file format. PKCS#8 PrivateKeyInfo (PEM "BEGIN PRIVATE

What are signature and __text_signature__ used for in Python 3.4

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问题 If one does dir() on some builtin callables (class constructors, methods, etc) on CPython 3.4, one finds out that many of them often have a special attribute called __text_signature__ , for example: >>> object.__text_signature__ \'()\' >>> int.__text_signature__ >>> # was None However the documentation for this is nonexistent. Furthermore, googling for the attribute name suggests that there is also another possible special attribute __signature__ , though I did not find any built-in functions

Get timestamp from Authenticode Signed files in .NET

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问题 We need to verify that binary files are signed properly with digital signature (Authenticode). This can be achieved with signtool.exe pretty easily. However, we need an automatic way that also verifies signer name and timestamp. This is doable in native C++ with CryptQueryObject() API as shown in this wonderful sample: How To Get Information from Authenticode Signed Executables However we live in a managed world :) hence looking for C# solution to the same problem. Straight approach would be

Using a PEM encoded, encrypted private key to sign a message natively

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问题 I\'m trying to use a PEM(X.509) certificate (stored in a privateKey.pem file on disk) to sign messages sent via sockets in Java, but am having a lot of trouble finding an example that\'s close. I\'m normally a C++ guy who\'s just stepping in to help on this project, so it\'s been a little difficult for me to put it all together into code that works when I\'m unfamiliar with the APIs. Unfortunately, I\'m limited to methods that come standard with Java (1.6.0 Update 16), so although I found a

C++ Function Callbacks: Cannot convert from a member function to a function signature

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问题 I\'m using a 3rd party library that allows me to register callbacks for certain events. The register function looks something like this. It uses the Callback signature. typedef int (*Callback)(std::string); void registerCallback(Callback pCallback) { //it gets registered } My problem is that I want to register a member function as a callback something like this struct MyStruct { MyStruct(); int myCallback(std::string str); }; MyStruct::MyStruct() { registerCallback(&MyStruct::myCallback); }

Meaning of instantiation mode indicators in arguments of Prolog predicates

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问题 Looking at Prolog documentation, predicate signatures are sometimes written as following: foo(:Bar, +Baz, -Qux, ?Mop) What are : , + , - and ? for and how do I interpret them? Also, are these the only ones that exist or are there more of them? 回答1: Those prefix operators, in this context, represent instantiation modes, i.e. they tell you which arguments should be variables or instantiated when calling the predicate. They also tell you if an argument will be (possibly further) instantiated by

How do you verify an RSA SHA1 signature in Python?

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问题 I\'ve got a string, a signature, and a public key, and I want to verify the signature on the string. The key looks like this: -----BEGIN PUBLIC KEY----- MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDfG4IuFO2h/LdDNmonwGNw5srW nUEWzoBrPRF1NM8LqpOMD45FAPtZ1NmPtHGo0BAS1UsyJEGXx0NPJ8Gw1z+huLrl XnAVX5B4ec6cJfKKmpL/l94WhP2v8F3OGWrnaEX1mLMoxe124Pcfamt0SPCGkeal VvXw13PLINE/YptjkQIDAQAB -----END PUBLIC KEY----- I\'ve been reading the pycrypto docs for a while, but I can\'t figure out how to make an RSAobj