sha256

xcode ios HMAC SHA 256 hashing

由 情到浓时终转凉″ 提交于 2019-12-20 09:54:14
问题 So I'm trying to figure out how to do a hmacshad256 hash on ios as that's the hash I did for the wcf service api I made. I've been trying to look for some info about it but would usually just end up getting a SHA-256 hash. This is the only reference I have: Need to generate HMAC SHA256 hash in Objective C as in Java And I'm not sure if that's the only way to do it (importing a java hmac class) Any help is appreciated. Thanks! 回答1: NSString * parameters = @"string to hash" NSString *salt = @

Generating a SHA256 hash with Crypto++, using a string as input and output?

由 江枫思渺然 提交于 2019-12-20 09:36:48
问题 I need an example of how to use Crypto++ to generate a SHA256 hash from a std::string and output a std::string. I can't seem to figure it out. Everything I've tried gives me invalid output. Here's the new code after interjay's answer: string SHA256(string data) { byte const* pbData = (byte*) data.data(); unsigned int nDataLen = data.size(); byte abDigest[CryptoPP::SHA256::DIGESTSIZE]; CryptoPP::SHA256().CalculateDigest(abDigest, pbData, nDataLen); return string((char*)abDigest); } The output

How to compute PDF signature hash?

由 ∥☆過路亽．° 提交于 2019-12-20 04:28:24
问题 This question is related to this one, but a bit more specific. I am suspecting I am not computing the hash of my pdf properly. I would like to compute the SHA256 hash of a signed PDF. According to PDF32000 I should: Get the \ByteRange values Concatenate the two chunks Compute the SHA256 Here is what I did: $ grep -aPo 'ByteRange\[\s*(\d+)\s+(\d+)\s+(\d+)\s+(\d+)\s*\]' dummy-signed.pdf ByteRange[ 0 59718 72772 5058] $ dd if=dummy-signed.pdf of=head.bin bs=1 skip=0 count=59718 59718 bytes (60

HMAC SHA256 hex digest of a string in Erlang, how?

由 删除回忆录丶 提交于 2019-12-19 05:44:51
问题 I am trying to interact with third party real time Web messaging System created and maintained by Pusher.com . Now, i cannot send anything through the API unless i produce an HMAC SHA256 hex digest of my data. A sample source code written in ruby could try to illustrate this: # Dependencies # gem install ruby-hmac # require 'rubygems' require 'hmac-sha2' secret = '7ad3773142a6692b25b8' string_to_sign = "POST\n/apps/3/channels/test_channel/events\nauth_key=278d425bdf160c739803&auth_timestamp

What does SHA256 hexadecimal string look like?

由 时光总嘲笑我的痴心妄想 提交于 2019-12-19 05:06:54
问题 I have been looking all over google to find what the hex output of a SHA256 hash looks like. But I just can't seem to find it. So what does a SHA256 hash look like when it's converted to hexadecimal? 回答1: A SHA256 hash represented in hexadecimal consists of 64 hexadecimal characters, i.e. it matches the following regex: ^[A-Fa-f0-9]{64}$ Example: 7f83b1657ff1fc53b92dc18148a1d65dfc2d4b1fa3d677284addd200126d9069 来源： https://stackoverflow.com/questions/6630168/what-does-sha256-hexadecimal-string

Fast and light JavaScript SHA-256 secure hash implementation [closed]

由 柔情痞子 提交于 2019-12-19 04:56:34
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 4 years ago . I'm looking for a hash implementation that is; secure (practically impossible to invert) fast (few ms) light (few KB) runs in the browser Ideally a SHA-256 implementation, since it is widely used and therefore widely tested against. 回答1: Doing some tests suggests that forge is the fastest SHA-256 JavaScript

C# Calculate SHA256 value for SEPA (XML) paymentfile

由 我是研究僧i 提交于 2019-12-19 04:14:46
问题 in the specification of the "DFÜ agreement" is described to calculate the hashvalue for a SEPA container payment file by SHA256. The hash value is created using the entire contained document, including the opening and closing "document" tag. The document is canonised according to Canonical XML, version 1.0. (http://www.w3.org/TR/2001/REC-xml-c14n-20010315). In the case of included documents, the canonisation has also to be executed according to the main document. SHA-256 is used as hash

PHP 之sha256 sha512封装

由 懵懂的女人 提交于 2019-12-18 12:04:39
PHP 之sha256 sha512封装 /* PHP sha256 sha512目前（PHP 7.1）没有内置的函数来计算，sha1() sha1_file() md5() md5_file()分别可以用来计算字符串和文件的sha1散列值和md5散列值，当前最新版本PHP 7.1 sha256() sha256_file() sha512() sha512_file()这样的函数也没有。SHA-2是SHA-224、SHA-256、SHA-384，和SHA-512的合称。 PHP 计算sha256 sha512可以使用hash()函数实现，计算文件的sha256 sha512则可以使用hash_file()实现。 hash($algo , $data, $rawOutput); hash_file($algo , $filepath, $rawOutput); 其中$algo是算法，可以是sha256, sha512等值，支持的算法可以使用hash_algos()查看，该函数返回所有支持的算法。 $data是需要计算hash值的字符串，$filepath是需要计算hash值的文件名，可以是相对路径也可以是绝对路径。 $rawOutput是一个可选的布尔值参数，如果为true，则返回二进制数据，如果为false则返回字符串，默认值为false. 我们可以封装自定义函数来实现PHP

SHA-256 implementation in Python

由 跟風遠走 提交于 2019-12-18 11:45:30
问题 I'm looking for an implementation of the SHA-256 hash function written in Python. I want to use it to get a better understanding of how the SHA-256 function works, and I think Python is the ideal language for this. Pseudo-code has the limitation that I can't run/test it, to see what my modifications of the code do to the output. 回答1: PyPy's source contains a pure-python implementation of SHA-256 here. Poking around in that directory, you'll probably also find pure-python implementations of

A “pure” scheme implementation (R5RS) of SHA256?

由 杀马特。学长 韩版系。学妹 提交于 2019-12-18 11:13:46
问题 I can use SHA256 in Scheme using external libraries (Java, C or system dependent) or using a specific Scheme implementation (like Chicken e.g.), but I wonder if there is a "pure" scheme implementation. 回答1: I wrote an implementation today. Alas, R5RS has neither bytevectors nor binary I/O, so this uses the R7RS APIs for bytevectors and binary I/O. It should be easy to bridge those APIs to your Scheme implementation's native APIs (for example, I actually tested my implementation on Racket and
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