signature

问题 Is there a way to convert an image to an html equivalent of the image, by having an html table divided up into many cells each having a certain background colour which would act like pixels in an image? Much like ASCII art. I would see this as a way to have a corporate logo in an email signature without having to worry about email clients blocking images. 回答1: Yep, loads of people have done this: http://pgl.yoyo.org/img2html/ is an example. 回答2: Perhaps what you need is just converting your

问题 Consider (a->a) -> [a] -> Bool Is there any meaningful definition for this signature? That is, a definition that not simply ignores the argument? x -> [a] -> Bool It seems there are many such signatures that can be ruled out immediately. 回答1: Carsten König suggested in a comment to use the free theorem. Let's try that. Prime the cannon We start by generating the free theorem corresponding to the type (a->a) -> [a] -> Bool . This is a property that every function with that type must satisfy,

问题 I am wondering if there is anything in Agda that resembles Haskell's deriving Eq clause ---then I have an associated question below, as well. For example, suppose I have types for a toy-language, data Type : Set where Nat : Type Prp : Type Then I can implement decidable equality by pattern matching and C-c C-a , _≟ₜ_ : Decidable {A = Type} _≡_ Nat ≟ₜ Nat = yes refl Nat ≟ₜ Prp = no (λ ()) Prp ≟ₜ Nat = no (λ ()) Prp ≟ₜ Prp = yes refl I'm curious if this can be mechanised or automated somehow

问题 I work with the brazilian "Nota Fiscal Eletronica" project, in which they define a standart way to sign XML documents. Recently, they started to require that there are absolutely no whitespaces between tags, including signature tags (*). We happen to use apache's XMLSignature and I can't seem to produce an unindented signature. If I remove the whitespaces after signing, the signature gets broken. I cannot change the canonicalizer / transformers set either, since they're predefined. I couldn't

问题 I understand the difference between symmetric and asymmetric keys. I understand that the keys are used to calculate the signature and then verify them. However diving a little deeper, I'd like to understand a bit more which I'm having trouble finding online. Are the keys given to the consumers to verify the contents? Wouldn't that give consumers the ability to change the JWT contents if symmetric keys are used? When asymmetric keys are used is the signature calculated with the private or

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 3 years ago . I am new to Android. I am developing an application that requires a user signature. How can I capture a signature in Android? 回答1: Your question is a little too broad. Try asking a question about a specific problem, not "how do I do something general". See the FAQ for more

问题 I need to view who signed the application I have installed onto my device. Is this generally possible to do on the device or on PC? 回答1: (assuming you can obtain access to the raw apk file - which you usually can, if you know or make an educated guess of its name and location, even though you can't list the contents of /data on a non-rooted phone) You could open the apk as a zip file and filter the ascii text from the binary content of META-INF/CERT.RSA Or using an actual tool, jarsigner

问题 I have seen it first time ... in a method signature. I tried to access a .class file. It has a method defined as below public void addGraphData(GraphData... _graphData) { } And that GraphData is nothing but POJO with getters and setters. Why is the .class file displaying GraphData... _graphData instead of GraphData _graphData ?? 回答1: It's varargs and can only be used last in a parameter list. The last param can hold more than one object. public class C { int i; String[] s; public C(int i,

问题 SO I am testing a Rest OAuth implementation. My testing tool will send the HTTP Request, but I need to prepare the Authorization header. What I need: I want a valid Authorization Header What I have: All the headers except the oauth_signature I also have the 2 secrets, the token_secret and the consumer_secret. I also posses the access_token. So It really boils down to, having to sign this request. How do I do that? Summary : I simply need to populate the oauth_signature portion of the

问题 When I invoke API endpoints from REST client, I got error by concerning with Signature. Request: Host : https://xxx.execute-api.ap-southeast-1.amazonaws.com/latest/api/name Authorization : AWS4-HMAC-SHA256 Credential= {AWSKEY} /20160314/ap-southeast-1/execute-api/aws4_request,SignedHeaders=host;range;x-amz-date,Signature= {signature} X-Amz-Date : 20160314T102915Z Response: { "message": "The request signature we calculated does not match the signature you provided. Check your AWS Secret Access