SHA-512不能正常工作的C++實現

Question

我需要在C++中實現幾個SHA版本，主要是從零開始爲一個夏令營。 Here's the docs for the algorithm。

我已經得到了SHA-1，SHA-224和SHA-256的完美運行，但是我沒有設法獲得512或其衍生物。我應該得到ddaf35a193617aba cc417349ae204131 12e6fa4e89a97ea2 0a9eeee64b55d39a 2192992a274fc1a8 36ba3c23a3feebbd 454d4423643ce80e 2a9ac94fa54ca49f，但我的程序給我21fb47208172306 4570d403444f23d 3fcab6a24097aaf4 7920558b5eea0ae8 7cfc6ce26543e3a6 8ba9c07d1b89d02 1e27ad9d5487df13 2e4a745e0e4df60。

main.cpp中：

#include "main.h" 
#include <iostream> 
#include <iomanip> 
#include <sstream> 
int main(int argc, const char * argv[]) { 
    std::string msg = "abc"; 
    std::string hashedMsg = hash(msg); 
    std::cout << "Hash:" << std::endl << hashedMsg; 
    std::cin.get(); 
} 
std::string hash(std::string msg) 
{ 
    //Preprocessing 
    const unsigned char eighty = 0x80; 
    unsigned long long msgLength = msg.length() * 8; 
    unsigned long long msgBitSize = _byteswap_uint64(msgLength); 
    unsigned long long k = 1024 - ((msgLength + 64 + 1) % 1024); 
    unsigned long long finalSize = msgLength + 1 + k + 64; 
    unsigned long long hashValues[] = { 
     0x6a09e667f3bcc908, 0xbb67ae8584caa73b, 0x3c6ef372fe94f82b, 0xa54ff53a5f1d36f1, 
     0x510e527fade682d1, 0x9b05688c2b3e6c1f, 0x1f83d9abfb41bd6b, 0x5be0cd19137e2179 
    }; 
    std::vector<unsigned long long> words(finalSize/64); 
    std::memcpy(words.data(), msg.c_str(), msg.length()); 
    std::memcpy((unsigned char *)words.data() + msg.length(), &eighty, 1); 
    std::memcpy((unsigned char *)words.data() + msg.length()+1+((k-7)/8), &msgBitSize, 8); 
    unsigned char* byte = (unsigned char*)words.data(); 
    for (int i = 0; i < words.size() * 8; i++) { 
     std::bitset<8> b(byte[i]); 
     std::cout << b << " " << std::hex << std::setfill('0') << std::setw(2) << (int)byte[i] << std::endl; 
    } 
    // Processing 
    unsigned long long workingValues[8]; 
    unsigned long long a; 
    unsigned long long b; 
    unsigned long long c; 
    unsigned long long d; 
    unsigned long long e; 
    unsigned long long f; 
    unsigned long long g; 
    unsigned long long h; 
    unsigned long long temp1; 
    unsigned long long temp2; 
    for (int chunk = 0; chunk < words.size(); chunk += 16) { 
     std::vector<unsigned long long> schedule(80); 
     for (int i = 0; i < 16; i++) { 
      schedule[i] = _byteswap_uint64(words[chunk + i]); 
     } 
     for (int i = 16; i < 80; i++) { 
      schedule[i] = (s1(schedule[i - 2]) + schedule[i - 7] + s0(schedule[i - 15]) + schedule[i - 16]) % (long long)(pow(2, 64)); 
     } 
     for (int i = 0; i < 8; i++) { 
      workingValues[i] = hashValues[i]; 
     } 
     a = workingValues[0]; 
     b = workingValues[1]; 
     c = workingValues[2]; 
     d = workingValues[3]; 
     e = workingValues[4]; 
     f = workingValues[5]; 
     g = workingValues[6]; 
     h = workingValues[7]; 
     for (int t = 0; t < 80; t++) { 
      temp1 = (h + S1(e) + ch(e, f, g) + sha::words[t] + schedule[t]) % (long long)(pow(2, 64)); 
      temp2 = (S0(a) + maj(a, b, c)) % (long long)(pow(2, 64)); 
      h = g; 
      g = f; 
      f = e; 
      e = (d + temp1) % (long long)(pow(2, 64)); 
      d = c; 
      c = b; 
      b = a; 
      a = (temp1 + temp2) % (long long)(pow(2, 64)); 
     } 
     hashValues[0] = (hashValues[0] + a) % (long long)(pow(2, 64)); 
     hashValues[1] = (hashValues[1] + b) % (long long)(pow(2, 64)); 
     hashValues[2] = (hashValues[2] + c) % (long long)(pow(2, 64)); 
     hashValues[3] = (hashValues[3] + d) % (long long)(pow(2, 64)); 
     hashValues[4] = (hashValues[4] + e) % (long long)(pow(2, 64)); 
     hashValues[5] = (hashValues[5] + f) % (long long)(pow(2, 64)); 
     hashValues[6] = (hashValues[6] + g) % (long long)(pow(2, 64)); 
     hashValues[7] = (hashValues[7] + h) % (long long)(pow(2, 64)); 
    } 
    // Return final message 
    std::stringstream ss; 
    for (int i = 0; i < 8; i++) { 
     ss << std::hex << hashValues[i]; 
    } 
    return ss.str(); 
} 

main.h：

#pragma once 
#include<string> 
#include<vector> 
#include<bitset> 
namespace sha { 
    const unsigned long long words[] = { 
     0x428a2f98d728ae22, 0x7137449123ef65cd, 0xb5c0fbcfec4d3b2f, 0xe9b5dba58189dbbc, 
     0x3956c25bf348b538, 0x59f111f1b605d019, 0x923f82a4af194f9b, 0xab1c5ed5da6d8118, 
     0xd807aa98a3030242, 0x12835b0145706fbe, 0x243185be4ee4b28c, 0x550c7dc3d5ffb4e2, 
     0x72be5d74f27b896f, 0x80deb1fe3b1696b1, 0x9bdc06a725c71235, 0xc19bf174cf692694, 
     0xe49b69c19ef14ad2, 0xefbe4786384f25e3, 0x0fc19dc68b8cd5b5, 0x240ca1cc77ac9c65, 
     0x2de92c6f592b0275, 0x4a7484aa6ea6e483, 0x5cb0a9dcbd41fbd4, 0x76f988da831153b5, 
     0x983e5152ee66dfab, 0xa831c66d2db, 0xb00327c898fb213f, 0xbf597fc7beef0ee4, 
     0xc6e00bf33da88fc2, 0xd5a79147930aa725, 0x06ca6351e003826f, 0x142929670a0e6e70, 
     0x27b70a8546d22ffc, 0x2e1b21385c26c926, 0x4d2c6dfc5ac42aed, 0x53380d139d95b3df, 
     0x650a73548baf63de, 0x766a0abb3c77b2a8, 0x81c2c92e47edaee6, 0x92722c851482353b, 
     0xa2bfe8a14cf10364, 0xa81a664bbc423001, 0xc24b8b70d0f89791, 0xc76c51a30654be30, 
     0xd192e819d6ef5218, 0xd69906245565a910, 0xf40e35855771202a, 0x106aa07032bbd1b8, 
     0x19a4c116b8d2d0c8, 0x1e376c085141ab53, 0x2748774cdf8eeb99, 0x34b0bcb5e19b48a8, 
     0x391c0cb3c5c95a63, 0x4ed8aa4ae3418acb, 0x5b9cca4f7763e373, 0x682e6ff3d6b2b8a3, 
     0x748f82ee5defb2fc, 0x78a5636f43172f60, 0x84c87814a1f0ab72, 0x8cc702081a6439ec, 
     0x90befffa23631e28, 0xa4506cebde82bde9, 0xbef9a3f7b2c67915, 0xc67178f2e372532b, 
     0xca273eceea26619c, 0xd186b8c721c0c207, 0xeada7dd6cde0eb1e, 0xf57d4f7fee6ed178, 
     0x06f067aa72176fba, 0x0a637dc5a2c898a6, 0x113f9804bef90dae, 0x1b710b35131c471b, 
     0x28db77f523047d84, 0x32caab7b40c72493, 0x3c9ebe0a15c9bebc, 0x431d67c49c100d4c, 
     0x4cc5d4becb3e42b6, 0x597f299cfc657e2a, 0x5fcb6fab3ad6faec, 0x6c44198c4a475817 
    }; 
} 
std::string hash(std::string msg); 
unsigned long long rotr(unsigned long long x, unsigned int n) { 
    return (x >> n) | (x << (32 - n)); 
} 
unsigned long long ch(unsigned long long e, unsigned long long f, unsigned long long g) { 
    return (e & f)^((~e) & g); 
} 
unsigned long long maj(unsigned long long a, unsigned long long b, unsigned long long c) { 
    return (a & b)^(a & c)^(b & c); 
} 
unsigned long long s0(unsigned long long x) { 
    return rotr(x, 1)^rotr(x, 8)^(x >> 7); 
} 
unsigned long long s1(unsigned long long x) { 
    return rotr(x, 19)^rotr(x, 61)^(x >> 6); 
} 
unsigned long long S0(unsigned long long x) { 
    return rotr(x, 28)^rotr(x, 34)^rotr(x, 39); 
} 
unsigned long long S1(unsigned long long x) { 
    return rotr(x, 14)^rotr(x, 18)^rotr(x, 41); 
} 

如果有幫助，我使用的Visual Studio 2015年，我已經嘗試使用內置的64位cl.exe編譯器，雖然它給了我一個不同的散列，但它仍然不是目標散列。我在這裏做錯了什麼？

Answer 1

有在此實現兩個錯誤：

1. 在rotr，你應該有一個64 - n代替32 - n
2. 您應該刪除所有% (long long)(pow(2, 64));。如果您使用uint64_t而不是unsigned long long，則不需要這些。他們在這裏引起bug，因爲long long通常是64位，並且它不能存儲數字2^64。使用uint64_t「自動」使用模2^64。

而且這是值得商榷的把所有這些功能定義和數據到頭文件。至少應該使用inline作爲函數定義。但你最好把它們移到.cpp。