sha256.cpp

#include <cstring>
#include <fstream>
#include <string>

#include "sha256.hpp"


#define SHA2_SHFR(x, n)    (x >> n)
#define SHA2_ROTR(x, n)   ((x >> n) | (x << ((sizeof(x) << 3) - n)))
#define SHA2_ROTL(x, n)   ((x << n) | (x >> ((sizeof(x) << 3) - n)))
#define SHA2_CH(x, y, z)  ((x & y) ^ (~x & z))
#define SHA2_MAJ(x, y, z) ((x & y) ^ (x & z) ^ (y & z))
#define SHA256_F1(x) (SHA2_ROTR(x,  2) ^ SHA2_ROTR(x, 13) ^ SHA2_ROTR(x, 22))
#define SHA256_F2(x) (SHA2_ROTR(x,  6) ^ SHA2_ROTR(x, 11) ^ SHA2_ROTR(x, 25))
#define SHA256_F3(x) (SHA2_ROTR(x,  7) ^ SHA2_ROTR(x, 18) ^ SHA2_SHFR(x,  3))
#define SHA256_F4(x) (SHA2_ROTR(x, 17) ^ SHA2_ROTR(x, 19) ^ SHA2_SHFR(x, 10))
#define SHA2_UNPACK32(x, str)                 \
    {                                             \
        *((str) + 3) = (uint8_t) ((x)      );       \
        *((str) + 2) = (uint8_t) ((x) >>  8);       \
        *((str) + 1) = (uint8_t) ((x) >> 16);       \
        *((str) + 0) = (uint8_t) ((x) >> 24);       \
    }
#define SHA2_PACK32(str, x)                   \
    {                                             \
        *(x) =   ((uint32_t) *((str) + 3)      )    \
                 | ((uint32_t) *((str) + 2) <<  8)    \
                 | ((uint32_t) *((str) + 1) << 16)    \
                 | ((uint32_t) *((str) + 0) << 24);   \
    }




const uint32_t SHA256::sha256_k[64] = //UL = uint32_t
{
    0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
    0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
    0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
    0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
    0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
    0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
    0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
    0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
    0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
    0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
    0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
    0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
    0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
    0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
    0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
    0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
};


void SHA256::transform(const unsigned char* message, uint32_t block_nb)
{
    uint32_t w[64];
    uint32_t wv[8];
    uint32_t t1, t2;
    const unsigned char* sub_block;
    int32_t i;
    int32_t j;

    for (i = 0; i < (int32_t) block_nb; i++)
    {
        sub_block = message + (i << 6);

        for (j = 0; j < 16; j++)
        {
            SHA2_PACK32(&sub_block[j << 2], &w[j]);
        }

        for (j = 16; j < 64; j++)
        {
            w[j] =  SHA256_F4(w[j -  2]) + w[j -  7] + SHA256_F3(w[j - 15]) + w[j - 16];
        }

        for (j = 0; j < 8; j++)
        {
            wv[j] = m_h[j];
        }

        for (j = 0; j < 64; j++)
        {
            t1 = wv[7] + SHA256_F2(wv[4]) + SHA2_CH(wv[4], wv[5], wv[6])
                 + sha256_k[j] + w[j];
            t2 = SHA256_F1(wv[0]) + SHA2_MAJ(wv[0], wv[1], wv[2]);
            wv[7] = wv[6];
            wv[6] = wv[5];
            wv[5] = wv[4];
            wv[4] = wv[3] + t1;
            wv[3] = wv[2];
            wv[2] = wv[1];
            wv[1] = wv[0];
            wv[0] = t1 + t2;
        }

        for (j = 0; j < 8; j++)
        {
            m_h[j] += wv[j];
        }
    }
}


void SHA256::init()
{
    m_h[0] = 0x6a09e667;
    m_h[1] = 0xbb67ae85;
    m_h[2] = 0x3c6ef372;
    m_h[3] = 0xa54ff53a;
    m_h[4] = 0x510e527f;
    m_h[5] = 0x9b05688c;
    m_h[6] = 0x1f83d9ab;
    m_h[7] = 0x5be0cd19;
    m_len = 0;
    m_tot_len = 0;
}


void SHA256::update(const unsigned char* message, size_t len)
{
    uint32_t block_nb;
    size_t new_len, rem_len, tmp_len;
    const unsigned char* shifted_message;
    tmp_len = SHA224_256_BLOCK_SIZE - m_len;
    rem_len = len < tmp_len ? len : tmp_len;
    memcpy(&m_block[m_len], message, rem_len);

    if (m_len + len < SHA224_256_BLOCK_SIZE)
    {
        m_len += len;
        return;
    }

    new_len = len - rem_len;
    block_nb = new_len / SHA224_256_BLOCK_SIZE;
    shifted_message = message + rem_len;
    transform(m_block, 1);
    transform(shifted_message, block_nb);
    rem_len = new_len % SHA224_256_BLOCK_SIZE;
    memcpy(m_block, &shifted_message[(size_t)block_nb << 6], rem_len);
    m_len = rem_len;
    m_tot_len += (block_nb + 1) << 6;
}


void SHA256::final(unsigned char* digest)
{
    uint32_t block_nb;
    size_t pm_len;
    size_t len_b;
    int i;
    block_nb = (1 + ((SHA224_256_BLOCK_SIZE - 9)
                     < (m_len % SHA224_256_BLOCK_SIZE)));
    len_b = (m_tot_len + m_len) << 3;
    pm_len = block_nb << 6;
    memset(m_block + m_len, 0, pm_len - m_len);
    m_block[m_len] = 0x80;
    SHA2_UNPACK32(len_b, m_block + pm_len - 4);
    transform(m_block, block_nb);

    for (i = 0 ; i < 8; i++)
    {
        SHA2_UNPACK32(m_h[i], &digest[i << 2]);
    }
}






std::string sha256(std::string input)
{
    unsigned char digest[SHA256::DIGEST_SIZE];
    memset(digest, 0, SHA256::DIGEST_SIZE);

    SHA256 ctx = SHA256();
    ctx.init();
    ctx.update( (unsigned char*)input.c_str(), input.length());
    ctx.final(digest);

    char buf[2 * SHA256::DIGEST_SIZE + 1];
    buf[2 * SHA256::DIGEST_SIZE] = 0;

    for (size_t i = 0; i < SHA256::DIGEST_SIZE; i++)
        sprintf(buf + i * 2, "%02x", digest[i]);

    return std::string(buf);
}



std::string sha256(std::fstream& file, std::streampos start, std::streamsize length)
{
    file.seekg(start);
    char* buffer = new char[length+1];
    length = file.readsome(buffer, length);
    std::string sContents(buffer, length);
    delete[] buffer;
    return sha256(sContents);
}


std::string sha256(std::fstream& file)
{
    std::streampos pos = file.tellg();
    file.seekg(0, std::ios_base::end);
    std::streamsize len = file.tellg() - pos;
    return sha256(file, pos, len);
}