signature

How does Perl 6's multi dispatch decide which routine to use?

别说谁变了你拦得住时间么 提交于 2019-12-04 11:33:19
Consider this program where I construct an Array in the argument list. Although there's a signature that accepts an Array, this calls the one that accepts a List: foo( [ 1, 2, 3 ] ); multi foo ( Array @array ) { put "Called Array @ version" } multi foo ( Array $array ) { put "Called Array \$ version" } multi foo ( List $list ) { put "Called List version" } multi foo ( Range $range ) { put "Called Range version" } I get the output from an unexpected routine: Called Array $ version If I uncomment that other signature, that one is called: Called List version Why doesn't it call the ( Array @array

Why 55 AA is used as the boot signature on IBM PCs? [closed]

扶醉桌前 提交于 2019-12-04 11:15:01
问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 7 years ago . Why does the IBM PC architecture use 55 AA magic numbers in the last two bytes of a bootsector for the boot signature ? I suspect that has something to do with the bit patterns they are: 01010101 10101010 , but don't know what. My guesses are that: BIOS is making some bitwise and/or/xor operations on these bytes

SML: What's the difference between using abstype and using a signature to hide the implementation of a structure?

冷暖自知 提交于 2019-12-04 10:13:55
问题 I've done a little work in SML in the past, but I'm now starting to get to the more interesting parts. Using the abstype...with...end construct, I can make things but keep their implementation details hidden. I can also create a signature of the thing I want to make, and use the :> operator to make a structure adhering to that signature that keeps the implementation details hidden. Aren't signatures/structures just a more general version of abstypes? What can I do with abstypes that I can't

signature with SHA256

一个人想着一个人 提交于 2019-12-04 09:59:27
I have a smartcard and I need to sign a file with this. That is a big problem as I see in stackover. I couldnt use RSACryptoServiceProvider, bkz it doesnt support RSA-SHA256 alogrithm. At First I used CAPICOM.dll , like code bellow, SignedData sed = new SignedData(); sed.Content = "a"; // data to sign Signer ser = new Signer(); ser.Certificate = cc; string singnn = sed.Sign(ser, false, CAPICOM_ENCODING_TYPE.CAPICOM_ENCODE_BASE64); But there isnt a public key to validate my signature value,, I couldnt get a validate key from capicom.dll. And after , I used X509Certificate2 , and

How to find signature of apk file?

China☆狼群 提交于 2019-12-04 09:46:19
What's the easiest way to find signature of an apk file? Please note that I'm not asking about code. I just want to find it from my pc. Signature like this one 975yYkKAQF+KST7g3ASHvHkYopq= Charuක Signature[] sigs = context.getPackageManager().getPackageInfo(context.getPackageName(), PackageManager.GET_SIGNATURES).signatures; for (Signature sig : sigs) { Trace.i("MyApp", "Signature hashcode : " + sig.hashCode()); } http://developer.android.com/reference/android/content/pm/PackageManager.html this might help First, unzip the APK and extract the file /META-INF/ANDROID_.RSA (this file may also be

spring aop 申明了切面类之后,如何申明切入点呢?

混江龙づ霸主 提交于 2019-12-04 09:09:28
8.2.3 Declaring a pointcut Recall that pointcuts determine join points of interest, and thus enable us to control when advice executes. Spring AOP only supports method execution join points for Spring beans , so you can think of a pointcut as matching the execution of methods on Spring beans. A pointcut declaration has two parts: a signature comprising a name and any parameters, and a pointcut expression that determines exactly which method executions we are interested in. Spring AOP 仅仅支持Bean里面的方法切入点,所以切入点主要作用就是申明 匹配 Bean里面的方法。Pointcut 申明有两个部分哦,一个是签名方法 包含有方法名字和参数。另外一个是切入点表达式,这个是用来申明在哪些方法上面执行切入

Can RSA be both used as encryption and signature?

旧巷老猫 提交于 2019-12-04 08:02:41
I am sorry but my mind suddenly goes blank for this question.... EDIT (Scenario) If I want information to bypass simple filters like f-ck , is it OK to encrypt the information with public key, and sign by private key? The public key may have already exchanged by both sides, and it is even hard to get the public key. EDIT 2 The information itself may not that much credential. The point of encryption and signature is for bypassing and integrity. RSA is two algorithms: one for asymmetric encryption and one for signatures. It so happens that both algorithms can use the same private key structure

TypeError: ufunc 'add' did not contain a loop

亡梦爱人 提交于 2019-12-04 02:21:49
I use Anaconda and gdsCAD and get an error when all packages are installed correctly. Like explained here: http://pythonhosted.org/gdsCAD/ TypeError: ufunc 'add' did not contain a loop with signature matching types dtype('S32') dtype('S32') dtype('S32') My imports look like this (In the end I imported everything): import numpy as np from gdsCAD import * import matplotlib.pyplot as plt My example code looks like this: something = core.Elements() box=shapes.Box( (5,5),(1,5),0.5) core.default_layer = 1 core.default_colors = 2 something.add(box) something.show() My error message looks like this: -

Does iphone provide any API to detect human thumb Impression?

我与影子孤独终老i 提交于 2019-12-04 02:16:03
问题 I wish to develop an app in iPhone in which user's thumb will be scanned first. The impression of the thumb should be used as a signature for email or report. Please suggest if its possible to do or not. If its possible then are there any tutorials or link. Thanks in advance, Prerna 回答1: Unfortunately no, iPhone detects touches as points, it's not sensitive enough to detect the human thumb with the fine marks of a thumbprint. Many have tried, some may even provide code, but ultimately it can

How to convert p:signature value to an image (or other serialised form)

て烟熏妆下的殇ゞ 提交于 2019-12-03 22:36:48
问题 I'm going to use the signature tag of PrimeFaces in my site, but I don't know how can I store in a form of an image in my database or if possible any other type. i just want to display it later in a datatable so the admin can manage and verify the authenticity of those signatures. this is my xhtml page. <h:form> <p:growl autoUpdate="true" /> <p:signature style="width:400px;height:200px" widgetVar="sig" value="#{cardBean.card.signature}" required="true" label="Signature" guideline="true"/>