Online SHA256 Hash Generator

I have a code in .Net to generate HMAC SHA256 hash. I tried my best to get the equivalent code in Python 2.7 but it differs. Where am I going wrong?

.Net code

using System;using System.Security.Cryptography;using System.Text;                  public class Program{    public static void Main()    {        var key = Guid.Parse("7a640e1f-df45-4652-a9d5-4bdc2003deac").ToByteArray();        var payload = Encoding.UTF8.GetBytes("ab38eadaeb746599f2c1ee90f8267f31f467347462764a24d71ac1843ee77fe3#40011234567890##34567####MitErpNavn#34567#20170719192159");        Console.WriteLine(key);        Console.WriteLine(payload);        for(var i = 0; i < key.Length;i++)        {            var b = key[i];            Console.WriteLine(b);        }        using(var ha = new HMACSHA256(key))        {           var hash = ha.ComputeHash(payload);           var result = Convert.ToBase64String(hash);            Console.WriteLine(result);        }    }}Output: f0UqIWmJBea+rTixF1jiCNhEt12yPN4R7gJclYMM3mE=

Python 2.7

import hmacimport hashlibimport base64import uuiderp_key = '7a640e1f-df45-4652-a9d5-4bdc2003deac'payload = 'ab38eadaeb746599f2c1ee90f8267f31f467347462764a24d71ac1843ee77fe3#40011234567890##34567####MitErpNavn#34567#20170719192159'erp_uuid = uuid.UUID(erp_key)dig = hmac.new(erp_uuid.bytes, msg=payload, digestmod=hashlib.sha256).digest()hash_key = base64.b64encode(dig).decode()print hash_keyOutput: wI/WinRP4mHfHLnFCSHn6j4VphSOO8CjLqkAVJi1HTQ=

Recently I am facing an issue to migrate an older android keystore. I searched lot but didn't get a solution.

I have an application with older MD5 hashed keystore(the keystore created on 2014). But now I want to upgrade the SHA hashing on the keystore without failing Application upgrade. Is this is possible?.

In SHA1, the hashing algorithm is weak that is why I am looking to upgrade obsoleted MD5 to SHA256/512.

I want to implement login functionality with an amazon seller central account. I was following the steps online for setup with amazon login and in one of the steps I have to register my android app in order to receive an api key. While registering the account, it asks for a signature value (32 hexadecimal pair value SHA-256) which i am not able to find out. The problem is my android application hasn't been released, so I am unsure if a build application also has a signature value or not? Can someone please let me know how to get the signature for an unreleased android app?

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.

Im getting dkim fail error while running the following code snippet

 HashAlgorithm hash = new SHA256Managed();        // HACK!! simulate the quoted-printable encoding SmtpClient will use        string hashBody = Body.Replace(Environment.NewLine, "=0D=0A") + Environment.NewLine;        byte[] bodyBytes = Encoding.ASCII.GetBytes(hashBody);        string hashout = Convert.ToBase64String(hash.ComputeHash(bodyBytes));        // timestamp  - seconds since 00:00:00 on January 1, 1970 UTC        TimeSpan t = DateTime.Now.ToUniversalTime() - DateTime.SpecifyKind(DateTime.Parse("00:00:00 January 1, 1970"), DateTimeKind.Utc);        string signatureHeader = "v=1; " +         "a=rsa-sha256; " +         "c=relaxed/relaxed; " +         "q=dns/txt;"+         "d=testdomainemail.cloudns.cx; " +         "s=key; " +         "t=" + Convert.ToInt64(t.TotalSeconds) + "; " +         "bh=" + hashout + "; " +         "h==Message-ID:From:To:Subject:Content-Type:Content-Transfer-Encoding; " +         "b=";        string canonicalizedHeaders =        "from:" + From + Environment.NewLine +        "to:" + To + Environment.NewLine +        "subject:" + Subject + Environment.NewLine +     @"content-type:text/plain; charset=us-asciicontent-transfer-encoding:quoted-printabledkim-signature:" + signatureHeader;        AsymmetricCipherKeyPair o;         TextReader reader = new StringReader(base64privatekey);        Org.BouncyCastle.OpenSsl.PemReader r = new Org.BouncyCastle.OpenSsl.PemReader(reader);        object obj = r.ReadObject();        o = obj as AsymmetricCipherKeyPair;        byte[] plaintext = Encoding.ASCII.GetBytes(canonicalizedHeaders);        ISigner sig = SignerUtilities.GetSigner("SHA256WithRSAEncryption");        sig.Init(true, o.Private);        sig.BlockUpdate(plaintext, 0, plaintext.Length);        byte[] signature = sig.GenerateSignature();        signatureHeader += Convert.ToBase64String(signature);

and my text record is,

"v=DKIM1; k=rsa; h=sha256; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDl1V7vSP9RujOyEryxNAzS8c5N/5MJq+fV74i92v3CgTWVeoZrIcncP+wLPN9OxW7aUVn4c/wpTlKJLUP2TpGO59Tyfw1oGIbzkz3b/mV0UqC1Z4dU9pYK3UfDGqmh1HOskQK9yh7nD5icWmUs/r2RuurF/OxJrey6KH1syrRQ7wIDAQAB"

and my dkim test report is

DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=testdomainemail.cloudns.cx; s=2015; t=1499854427; bh=i0QP7X7ADTgTY8llG4UeY5Dnal1PGxvfE7uKPgHSKoM=; h==Message-ID:From:To:Subject:Content-Type:Content-Transfer-Encoding; b=o36YvoAO1eC/3/NA7CpZNRjadeVYtTocYbnDoIbvTOMZPU7sCT0JZPa5vIwe1DvQqcvNSiGk7ZNFPlIDW+6g7sPxK/sDa3qXGnRzHsWDNkGKLfHnZ+XehDtwOBZflhRcumLyKVAZLTu9/+8P1pkl3tv2s8mU2z/SvCwnsBgaEf0= Signed-by: mail@testdomainemail.cloudns.cx Expected-Body-Hash: i0QP7X7ADTgTY8llG4UeY5Dnal1PGxvfE7uKPgHSKoM= Public-Key: v=DKIM1; k=rsa; h=sha256; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDl1V7vSP9RujOyEryxNAzS8c5N/5MJq+fV74i92v3CgTWVeoZrIcncP+wLPN9OxW7aUVn4c/wpTlKJLUP2TpGO59Tyfw1oGIbzkz3b/mV0UqC1Z4dU9pYK3UfDGqmh1HOskQK9yh7nD5icWmUs/r2RuurF/OxJrey6KH1syrRQ7wIDAQAB

DKIM-Result: fail (bad signature)