Online SHA256 Hash Generator

We currently encrypt the certain string use the following code in java

private String getSignedRequest(String key, String data) {        try {            Mac sha256_HMAC = Mac.getInstance("HmacSHA256");            SecretKeySpec secret_key = new SecretKeySpec(key.getBytes("UTF-8"), "HmacSHA256a");            sha256_HMAC.init(secret_key);            return Base64.encodeToString(sha256_HMAC.doFinal(data.getBytes("UTF-8")), Base64.NO_WRAP);        } catch (Exception e) {            return "";        }    }

Need to move this piece of code to c code which can than be accessed using JNI by java class.

C++ standard library doesn't include HMAC or Sha so how to achieve this in c/c++ when using Android.

Thanks for the help.

How to calculate SHA-256 of a bitmap image in android studio?

I have already tried converting image into byte array and then find its message digest but it gives a completely different answer than what I find using online SHA-256 converters. I know how to calculate SHA-256 for a string but I am unable to calculate SHA-256 for a bitmap image.

I have a vBulletin Database with double MD5'd passwords and a salt, would it be possible to take the Password in the vBulletin database, convert them to SHA256, and then store them in a new database? Is there any real easy way to do this?

My main and only reason, is to prevent users from having to create new accounts, and to stop using MD5.

I downloaded and extracted Crypto++ in C:\cryptopp. I used Visual Studio Express 2012 to build all the projects inside (as instructed in readme), and everything was built successfully. Then I made a test project in some other folder and added cryptolib as a dependency. After that, I added the include path so I can easily include all the headers. When I tried to compile, I got an error about unresolved symbols.

To remedy that, I added C:\cryptopp\Win32\Output\Debug\cryptlib.lib to link additional dependencies. Now I get this error:

Error   1   error LNK2038: mismatch detected for 'RuntimeLibrary': value 'MTd_StaticDebug' doesn't match value 'MDd_DynamicDebug' in program.obj    C:\Data\Work\C++ VS\CryptoTest\CryptoTest\cryptlib.lib(cryptlib.obj)    CryptoTestError   2   error LNK2038: mismatch detected for 'RuntimeLibrary': value 'MTd_StaticDebug' doesn't match value 'MDd_DynamicDebug' in program.obj    C:\Data\Work\C++ VS\CryptoTest\CryptoTest\cryptlib.lib(iterhash.obj)    CryptoTestError   3   error LNK2038: mismatch detected for 'RuntimeLibrary': value 'MTd_StaticDebug' doesn't match value 'MDd_DynamicDebug' in program.obj    C:\Data\Work\C++ VS\CryptoTest\CryptoTest\cryptlib.lib(sha.obj) CryptoTestError   4   error LNK2038: mismatch detected for 'RuntimeLibrary': value 'MTd_StaticDebug' doesn't match value 'MDd_DynamicDebug' in program.obj    C:\Data\Work\C++ VS\CryptoTest\CryptoTest\cryptlib.lib(pch.obj) CryptoTestError   5   error LNK2038: mismatch detected for 'RuntimeLibrary': value 'MTd_StaticDebug' doesn't match value 'MDd_DynamicDebug' in program.obj    C:\Data\Work\C++ VS\CryptoTest\CryptoTest\cryptlib.lib(misc.obj)    CryptoTestError   6   error LNK2038: mismatch detected for 'RuntimeLibrary': value 'MTd_StaticDebug' doesn't match value 'MDd_DynamicDebug' in program.obj    C:\Data\Work\C++ VS\CryptoTest\CryptoTest\cryptlib.lib(queue.obj)   CryptoTestError   7   error LNK2038: mismatch detected for 'RuntimeLibrary': value 'MTd_StaticDebug' doesn't match value 'MDd_DynamicDebug' in program.obj    C:\Data\Work\C++ VS\CryptoTest\CryptoTest\cryptlib.lib(algparam.obj)    CryptoTestError   8   error LNK2038: mismatch detected for 'RuntimeLibrary': value 'MTd_StaticDebug' doesn't match value 'MDd_DynamicDebug' in program.obj    C:\Data\Work\C++ VS\CryptoTest\CryptoTest\cryptlib.lib(filters.obj) CryptoTestError   9   error LNK2038: mismatch detected for 'RuntimeLibrary': value 'MTd_StaticDebug' doesn't match value 'MDd_DynamicDebug' in program.obj    C:\Data\Work\C++ VS\CryptoTest\CryptoTest\cryptlib.lib(fips140.obj) CryptoTestError   10  error LNK2038: mismatch detected for 'RuntimeLibrary': value 'MTd_StaticDebug' doesn't match value 'MDd_DynamicDebug' in program.obj    C:\Data\Work\C++ VS\CryptoTest\CryptoTest\cryptlib.lib(cpu.obj) CryptoTestError   11  error LNK2038: mismatch detected for 'RuntimeLibrary': value 'MTd_StaticDebug' doesn't match value 'MDd_DynamicDebug' in program.obj    C:\Data\Work\C++ VS\CryptoTest\CryptoTest\cryptlib.lib(mqueue.obj)  CryptoTest

I also get:

Error   12  error LNK2005: "public: __thiscall std::_Container_base12::_Container_base12(void)" (??0_Container_base12@std@@QAE@XZ) already defined in cryptlib.lib(cryptlib.obj)    C:\Data\Work\C++ VS\CryptoTest\CryptoTest\msvcprtd.lib(MSVCP110D.dll)   CryptoTestError   13  error LNK2005: "public: __thiscall std::_Container_base12::~_Container_base12(void)" (??1_Container_base12@std@@QAE@XZ) already defined in cryptlib.lib(cryptlib.obj)   C:\Data\Work\C++ VS\CryptoTest\CryptoTest\msvcprtd.lib(MSVCP110D.dll)   CryptoTestError   14  error LNK2005: "public: void __thiscall std::_Container_base12::_Orphan_all(void)" (?_Orphan_all@_Container_base12@std@@QAEXXZ) already defined in cryptlib.lib(cryptlib.obj)   C:\Data\Work\C++ VS\CryptoTest\CryptoTest\msvcprtd.lib(MSVCP110D.dll)   CryptoTestError   15  error LNK2005: "public: __thiscall std::locale::id::id(unsigned int)" (??0id@locale@std@@QAE@I@Z) already defined in cryptlib.lib(iterhash.obj) C:\Data\Work\C++ VS\CryptoTest\CryptoTest\msvcprtd.lib(MSVCP110D.dll)   CryptoTestWarning 16  warning LNK4098: defaultlib 'LIBCMTD' conflicts with use of other libs; use /NODEFAULTLIB:library   C:\Data\Work\C++ VS\CryptoTest\CryptoTest\LINK  CryptoTestError   17  error LNK1169: one or more multiply defined symbols found   C:\Data\Work\C++ VS\CryptoTest\Debug\CryptoTest.exe 1   1   CryptoTest

The code I tried to compile was simple (I got this from another site):

#include <iostream>#include <string>#include "sha.h"#include "hex.h"using namespace std;string SHA256(string data) {    byte const* pbData = (byte*) data.data();    unsigned int nDataLen = data.size();    byte abDigest[32];    CryptoPP::SHA256().CalculateDigest(abDigest, pbData, nDataLen);    return string((char*)abDigest);}int main(void) {    return 0;}

Any ideas how to fix this? I really only need SHA-256 right now, nothing else.I am using Windows 7 64 bit, and I downloaded VS C++ today, so it should be the newest version.

I'm trying to authenticate to Apple's AppStoreConnect API with an ES256 signed JWT (per their instructions at https://developer.apple.com/documentation/appstoreconnectapi) using PHP.

Sending my request always results in a 401 NOT_AUTHORIZED error.

I've verified that the the contents of my header and claims are correct - I even found a Ruby script online for generating an ES256 signed JWT and using my Apple provided Issuer, Key ID, Private Key, it works swimmingly - Apple accepts the token. That tells me that my credentials are good and I'm doing something wrong in php.

Unless I've simply stared at this code for too long, the JWT format is correct, base64 encoded correctly, and the bearer token is set correctly in the header.

To rule out an issue with request sending I've tried both GuzzleHTTP and CLI cURL - both a 401.

Here's the relevant code. You'll see that the create method is encoding the header and claims, signing the "payload", and concatenating all 3.

public function create(){    $header = $this->encode(        json_encode([            'kid' => 'my_key_id',            'alg' => 'ES256',            'typ' => 'JWT',        ])    );    $claims = $this->encode(        json_encode([            'iss' => 'my_issuer_uuid',            'exp' => time() + (20 * 60),            'aud' => 'appstoreconnect-v1',        ])    );    $signature = $this->encode(        $this->sign("$header.$claims")    );    return $header . '.' . $claims . '.' . $signature;}

This code successfully returns an open ssl resource, $data has the expected contents.

public function sign($data){    if (!$key = openssl_pkey_get_private('file://my_key_file.p8')) {        throw new \Exception('Failed to read PEM');    }    if (!openssl_sign($data, $signature, $key, OPENSSL_ALGO_SHA256)) {        throw new \Exception('Claims signing failed');    }    return $signature;}

Base64 URL encoding... $data has the expected contents.

public function encode($data){    return str_replace(['+', '/', '='], ['-', '_', ''], base64_encode($data));}

At this point I'm stumped to what it is I'm doing wrong or missing. I'm hoping some extra eyes will find something! Using the token that my code dumps out:

curl  https://api.appstoreconnect.apple.com/v1/users --Header "Authorization: Bearer <token>”

...always returns a 401. I suspect there's something wrong in the signing portion of the code as it's the only part I haven't been able to verify (again, worked in Ruby), though looking at all the docs and examples for openssl_sign, I'm pretty sure it's right.

For reference, this is the Ruby script I mention https://shashikantjagtap.net/generating-jwt-tokens-for-app-store-connect-api/