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SHA-2
(224, 256, 384, 512 bits)

Abstract

sha224(), sha256(), sha384() and sha512() calculate SHA-2 cryptographic hash function.
sha224(), sha256(), sha384() および sha512() は暗号学的ハッシュ関数である SHA-2 を計算します．

Header file

namespace sstd{
    std::vector<uint8> sha224(const uchar* in, size_t in_len);
    std::vector<uint8> sha256(const uchar* in, size_t in_len);
    std::vector<uint8> sha384(const uchar* in, size_t in_len);
    std::vector<uint8> sha512(const uchar* in, size_t in_len);

    std::vector<uint8> sha224(const std::vector<uint8>& in);
    std::vector<uint8> sha256(const std::vector<uint8>& in);
    std::vector<uint8> sha384(const std::vector<uint8>& in);
    std::vector<uint8> sha512(const std::vector<uint8>& in);
}

Usage

  • main.cpp 
    #include <sstd/sstd.hpp>

std::string uint8_to_str(const std::vector<uint8>& v){
    std::string s;
    for(uint i=0; i<v.size(); ++i){ s += sstd::ssprintf("%02x", (int)v[i]); }
    return s;
}

int main(){
    sstd::mkdir("./tmp");
    sstd::system("head -c 5m /dev/urandom > ./tmp/rand.txt"); // generate 5 MB random file
    sstd::system("sha224sum ./tmp/rand.txt");

    std::vector<uint8> vBin = sstd::read_bin("./tmp/rand.txt"); // read all as a binary
    std::string sha224_str = uint8_to_str( sstd::sha224( vBin ) );
    sstd::printn( sha224_str );

    sstd::rm("./tmp");
}
  • Execution result 
    sh: sha224sum: not found
sha224_str = "235a4decc2acbee677b5b3d8c9b07a9e418c407b0d156bec369cb5bf"

Implementation