cryptography

Convert X.509 certificate from hex form to .cer format

由 ♀尐吖头ヾ 提交于 2019-12-31 03:04:30
问题 How to convert X.509 certificate from a hex-dump form to .CER format? Additionally, should be blank space separators removed from hex dump first? Thanks. 回答1: You could use ASN.1 editor. It has a data converter that will convert HEX to PEM format of data. the source is also available so if you need to use it in code you can look how it is done. Or you could use certutil.exe using command certutil -decodehex c:\cert.hex c:\cert.cer 回答2: Normally .cer can either be binary encoded - DER - or it

OpenSSL ECDSA signatures longer than expected

由 ≡放荡痞女 提交于 2019-12-30 23:59:20
问题 I am attempting to generate "raw", unencoded ECDSA signatures for use with a cryptographic chip. The goal is to sign something on the host pc, then send it to the chip to be validated. However, I am running into a little problem. My understanding is that the ECDSA signature should be 64 bytes (for secp256v1). And, when I use the chip to generate a signature, it is indeed 64 bytes in length. However, when I use openssl, the signature is 71 bytes in length. The beginning of the signature seems

Python: where is random.random() seeded?

由 天大地大妈咪最大 提交于 2019-12-30 21:08:00
问题 Say I have some python code: import random r=random.random() Where is the value of r seeded from in general? And what if my OS has no random, then where is it seeded? Why isn't this recommended for cryptography? Is there some way to know what the random number is? 回答1: Follow da code . To see where the random module "lives" in your system, you can just do in a terminal: >>> import random >>> random.__file__ '/usr/lib/python2.7/random.pyc' That gives you the path to the .pyc ("compiled") file,

Python: where is random.random() seeded?

由 自作多情 提交于 2019-12-30 21:07:55
问题 Say I have some python code: import random r=random.random() Where is the value of r seeded from in general? And what if my OS has no random, then where is it seeded? Why isn't this recommended for cryptography? Is there some way to know what the random number is? 回答1: Follow da code . To see where the random module "lives" in your system, you can just do in a terminal: >>> import random >>> random.__file__ '/usr/lib/python2.7/random.pyc' That gives you the path to the .pyc ("compiled") file,

How to use SubtleCrypto in chrome (window.crypto.subtle is undefined)

由 China☆狼群 提交于 2019-12-30 17:16:05
问题 This is really embarassing on virtually any site on the internet, window.crypto.subtle returns SubtleCrypto {} __proto__: SubtleCrypto in the chrome console (v61 (Official Build) (64-bit)) except for my webpage, and blank.org where window.crypto.subtle returns undefined according to https://developer.mozilla.org/en-US/docs/Web/API/Crypto/subtle it's a read-only property that should always return a SubtleCrypto object. what could I have done, or what has blank.org done that it could possibly

Digest verification failed for Reference

由 半世苍凉 提交于 2019-12-30 12:04:44
问题 I have implementation of a custom STS. After being authenticated and redirected but before the page was loaded I would receive this error: [CryptographicException: Digest verification failed for Reference '#_8e0aea1a-713d-4536-8fac-a768073395e9'.] The reference number would change every time I tried. 回答1: I eventually found out that the claims, I had loaded from the database, had carriage return line feeds. Once I replaced those I had no more issues. 来源： https://stackoverflow.com/questions

Digest verification failed for Reference

由 我的梦境 提交于 2019-12-30 12:04:14
问题 I have implementation of a custom STS. After being authenticated and redirected but before the page was loaded I would receive this error: [CryptographicException: Digest verification failed for Reference '#_8e0aea1a-713d-4536-8fac-a768073395e9'.] The reference number would change every time I tried. 回答1: I eventually found out that the claims, I had loaded from the database, had carriage return line feeds. Once I replaced those I had no more issues. 来源： https://stackoverflow.com/questions

C# webservice 动态代理类调用webservice服务方法

由 时光怂恿深爱的人放手 提交于 2019-12-30 11:35:17
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 核心类库：使用C#编译辅助类CodeNamespace,CSharpCodeProvider,CompilerParameters,CompilerResults 通过反射创建代理实例并调用方法 using Microsoft.CSharp; using System; using System.CodeDom; using System.CodeDom.Compiler; using System.Collections.Generic; using System.IO; using System.Linq; using System.Net; using System.Security.Cryptography.X509Certificates; using System.Text; using System.Text.RegularExpressions; using System.Web.Services.Description; namespace Common { public class WSHelper { /// < summary> /// 动态调用web服务 /// < /summary> /// < param name="url">WSDL服务地址< /param> ///

How to pick Export Compliance in my app?

由 ￡可爱￡侵袭症＋ 提交于 2019-12-30 09:54:28
问题 I am submitting for review and not sure about the Export Compliance question Is your app designed to use cryptography or does it contain or incorporate cryptography? (Select Yes even if your app is only utilizing the encryption available in iOS or macOS.) The only internet function in my app is using Facebook Login on first screen for users to register and login. And I use Firebase as backend. So do I need to select Yes ? If I should pick Yes for first question, then second question Does your

How to store and reuse keypair in Java?

由 孤街浪徒 提交于 2019-12-30 08:17:21
问题 I am wanting generate a keypair once and reuse it. public static KeyPair generateKeyPair() throws Exception { KeyPairGenerator generator = KeyPairGenerator.getInstance("RSA"); generator.initialize(2048, new SecureRandom()); KeyPair pair = generator.generateKeyPair(); return pair; } How do I go about this? 回答1: There is a bit of a problem here: Java's focus is almost entirely on TLS and the cryptography required to implement TLS. For TLS a private key and a certificate is required. So you get
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