You need to convert the input string to a binary string using a hexdecoder.
Something like
string decoded;
CryptoPP::StringSource(src, true,
new CryptoPP::HexDecoder(
new CryptoPP::StringSink(decoded)));
Now use decoded instead of myString.
On Tuesday, March 17, 2015 at 2:44:18 PM UTC-7, JF Jobidon wrote:
> Hi
> I use c++ with crypto++ to generate a sha256 hash from this string:
> "800C28FCA386C7A227600B2FE50B7CAE11EC86D3BF1FBE471BE89827E19D72AA1D"
> I have the same result as
> http://www.xorbin.com/tools/sha256-hash-calculator :
>
> E2E4146A36E9C455CF95A4F259F162C353CD419CC3FD0E69AE36D7D1B6CD2C09
>
> but the problem is I try to obtain a private key for the Bitcoin protocol:
>
> when I use the *Bitcoin* Explorer (*bx*) command line tool.
>
> I have a different result:
>
> > bx sha256
> 800C28FCA386C7A227600B2FE50B7CAE11EC86D3BF1FBE471BE89827E19D72AA1D
> 8147786c4d15106333bf278d71dadaf1079ef2d2440a4dde37d747ded5403592
>
> So I don't end up with the same private key (WIF)
>
> Question: are there different implementations of sha256?
>
> Thanks
> JF
>
>
> Here is my code using crypto++
>
> #include <cryptopp/hex.h>
> #include <cryptopp/sha.h>
> #include <cryptopp/base64.h>
> #include <iostream>
> #include <string>
>
> using namespace std;
>
> string makeSHA256 (const string);
>
> int main()
> {
> string myString =
> "800C28FCA386C7A227600B2FE50B7CAE11EC86D3BF1FBE471BE89827E19D72AA1D";
>
> cout << makeSHA256(myString) << endl; //
> E2E4146A36E9C455CF95A4F259F162C353CD419CC3FD0E69AE36D7D1B6CD2C09
>
> return 0;
> }
>
>
> string makeSHA256 (const string myString) {
>
> string output;
>
> CryptoPP::SHA256 hash;
> byte digest[CryptoPP::SHA256::DIGESTSIZE];
>
> hash.CalculateDigest(digest,(const byte
> *)myString.c_str(),myString.size());
> //hash.CalculateDigest( digest, reinterpret_cast<byte*>(&myString[0]),
> myString.length() );
>
> CryptoPP::HexEncoder encoder;
> CryptoPP::StringSink *SS = new CryptoPP::StringSink(output);
> encoder.Attach(SS);
> encoder.Put(digest,sizeof(digest));
> encoder.MessageEnd();
>
> return output;
> }
>
>
>
>
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