C++ sha512 function
SHA-512 is the largest hash function in the SHA-2 family of hash functions. SHA-512 provides 256 bits of security to digital signatures and hash-only applications.
If SHA-512 is to be used for password hashing, select a good work factor. For instance, apply 2^8 (256) rounds of SHA-512, and store 8 as your work factor along with the hashed password. Later, you can increase your work factor and then still verify older passwords. Use a unique random salt for each password hash, and store that next to the hashed password as well. A unique random salt protects your passwords by making dictionary attacks much harder.
main.cpp
#include <iostream> #include "sha512.h" using std::string; using std::cout; using std::endl; int main(int argc, char *argv[]) { string input = "grape"; string output1 = sha512(input); cout << "sha512('"<< input << "'):" << output1 << endl; return 0; }
compile and run (in linux):
g++ sha512.cpp main.cpp -o sha512_example && ./sha512_example
output:
sha512('grape'):9375d1abdb644a01955bccad12e2f5c2bd8a3e226187e548d99c559a99461453b980123746753d07c169c22a5d9cc75cb158f0e8d8c0e713559775b5e1391fc4sha512.h
#ifndef SHA512_H #define SHA512_H #include <string> class SHA512 { protected: typedef unsigned char uint8; typedef unsigned int uint32; typedef unsigned long long uint64; const static uint64 sha512_k[]; static const unsigned int SHA384_512_BLOCK_SIZE = (1024/8); public: void init(); void update(const unsigned char *message, unsigned int len); void final(unsigned char *digest); static const unsigned int DIGEST_SIZE = ( 512 / 8); protected: void transform(const unsigned char *message, unsigned int block_nb); unsigned int m_tot_len; unsigned int m_len; unsigned char m_block[2 * SHA384_512_BLOCK_SIZE]; uint64 m_h[8]; }; std::string sha512(std::string input); #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 SHA512_F1(x) (SHA2_ROTR(x, 28) ^ SHA2_ROTR(x, 34) ^ SHA2_ROTR(x, 39)) #define SHA512_F2(x) (SHA2_ROTR(x, 14) ^ SHA2_ROTR(x, 18) ^ SHA2_ROTR(x, 41)) #define SHA512_F3(x) (SHA2_ROTR(x, 1) ^ SHA2_ROTR(x, 8) ^ SHA2_SHFR(x, 7)) #define SHA512_F4(x) (SHA2_ROTR(x, 19) ^ SHA2_ROTR(x, 61) ^ SHA2_SHFR(x, 6)) #define SHA2_UNPACK32(x, str) \ { \ *((str) + 3) = (uint8) ((x) ); \ *((str) + 2) = (uint8) ((x) >> 8); \ *((str) + 1) = (uint8) ((x) >> 16); \ *((str) + 0) = (uint8) ((x) >> 24); \ } #define SHA2_UNPACK64(x, str) \ { \ *((str) + 7) = (uint8) ((x) ); \ *((str) + 6) = (uint8) ((x) >> 8); \ *((str) + 5) = (uint8) ((x) >> 16); \ *((str) + 4) = (uint8) ((x) >> 24); \ *((str) + 3) = (uint8) ((x) >> 32); \ *((str) + 2) = (uint8) ((x) >> 40); \ *((str) + 1) = (uint8) ((x) >> 48); \ *((str) + 0) = (uint8) ((x) >> 56); \ } #define SHA2_PACK64(str, x) \ { \ *(x) = ((uint64) *((str) + 7) ) \ | ((uint64) *((str) + 6) << 8) \ | ((uint64) *((str) + 5) << 16) \ | ((uint64) *((str) + 4) << 24) \ | ((uint64) *((str) + 3) << 32) \ | ((uint64) *((str) + 2) << 40) \ | ((uint64) *((str) + 1) << 48) \ | ((uint64) *((str) + 0) << 56); \ } #endif
sha512.cpp
#include <cstring> #include <fstream> #include "sha512.h" const unsigned long long SHA512::sha512_k[80] = //ULL = uint64 {0x428a2f98d728ae22ULL, 0x7137449123ef65cdULL, 0xb5c0fbcfec4d3b2fULL, 0xe9b5dba58189dbbcULL, 0x3956c25bf348b538ULL, 0x59f111f1b605d019ULL, 0x923f82a4af194f9bULL, 0xab1c5ed5da6d8118ULL, 0xd807aa98a3030242ULL, 0x12835b0145706fbeULL, 0x243185be4ee4b28cULL, 0x550c7dc3d5ffb4e2ULL, 0x72be5d74f27b896fULL, 0x80deb1fe3b1696b1ULL, 0x9bdc06a725c71235ULL, 0xc19bf174cf692694ULL, 0xe49b69c19ef14ad2ULL, 0xefbe4786384f25e3ULL, 0x0fc19dc68b8cd5b5ULL, 0x240ca1cc77ac9c65ULL, 0x2de92c6f592b0275ULL, 0x4a7484aa6ea6e483ULL, 0x5cb0a9dcbd41fbd4ULL, 0x76f988da831153b5ULL, 0x983e5152ee66dfabULL, 0xa831c66d2db43210ULL, 0xb00327c898fb213fULL, 0xbf597fc7beef0ee4ULL, 0xc6e00bf33da88fc2ULL, 0xd5a79147930aa725ULL, 0x06ca6351e003826fULL, 0x142929670a0e6e70ULL, 0x27b70a8546d22ffcULL, 0x2e1b21385c26c926ULL, 0x4d2c6dfc5ac42aedULL, 0x53380d139d95b3dfULL, 0x650a73548baf63deULL, 0x766a0abb3c77b2a8ULL, 0x81c2c92e47edaee6ULL, 0x92722c851482353bULL, 0xa2bfe8a14cf10364ULL, 0xa81a664bbc423001ULL, 0xc24b8b70d0f89791ULL, 0xc76c51a30654be30ULL, 0xd192e819d6ef5218ULL, 0xd69906245565a910ULL, 0xf40e35855771202aULL, 0x106aa07032bbd1b8ULL, 0x19a4c116b8d2d0c8ULL, 0x1e376c085141ab53ULL, 0x2748774cdf8eeb99ULL, 0x34b0bcb5e19b48a8ULL, 0x391c0cb3c5c95a63ULL, 0x4ed8aa4ae3418acbULL, 0x5b9cca4f7763e373ULL, 0x682e6ff3d6b2b8a3ULL, 0x748f82ee5defb2fcULL, 0x78a5636f43172f60ULL, 0x84c87814a1f0ab72ULL, 0x8cc702081a6439ecULL, 0x90befffa23631e28ULL, 0xa4506cebde82bde9ULL, 0xbef9a3f7b2c67915ULL, 0xc67178f2e372532bULL, 0xca273eceea26619cULL, 0xd186b8c721c0c207ULL, 0xeada7dd6cde0eb1eULL, 0xf57d4f7fee6ed178ULL, 0x06f067aa72176fbaULL, 0x0a637dc5a2c898a6ULL, 0x113f9804bef90daeULL, 0x1b710b35131c471bULL, 0x28db77f523047d84ULL, 0x32caab7b40c72493ULL, 0x3c9ebe0a15c9bebcULL, 0x431d67c49c100d4cULL, 0x4cc5d4becb3e42b6ULL, 0x597f299cfc657e2aULL, 0x5fcb6fab3ad6faecULL, 0x6c44198c4a475817ULL}; void SHA512::transform(const unsigned char *message, unsigned int block_nb) { uint64 w[80]; uint64 wv[8]; uint64 t1, t2; const unsigned char *sub_block; int i, j; for (i = 0; i < (int) block_nb; i++) { sub_block = message + (i << 7); for (j = 0; j < 16; j++) { SHA2_PACK64(&sub_block[j << 3], &w[j]); } for (j = 16; j < 80; j++) { w[j] = SHA512_F4(w[j - 2]) + w[j - 7] + SHA512_F3(w[j - 15]) + w[j - 16]; } for (j = 0; j < 8; j++) { wv[j] = m_h[j]; } for (j = 0; j < 80; j++) { t1 = wv[7] + SHA512_F2(wv[4]) + SHA2_CH(wv[4], wv[5], wv[6]) + sha512_k[j] + w[j]; t2 = SHA512_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 SHA512::init() { m_h[0] = 0x6a09e667f3bcc908ULL; m_h[1] = 0xbb67ae8584caa73bULL; m_h[2] = 0x3c6ef372fe94f82bULL; m_h[3] = 0xa54ff53a5f1d36f1ULL; m_h[4] = 0x510e527fade682d1ULL; m_h[5] = 0x9b05688c2b3e6c1fULL; m_h[6] = 0x1f83d9abfb41bd6bULL; m_h[7] = 0x5be0cd19137e2179ULL; m_len = 0; m_tot_len = 0; } void SHA512::update(const unsigned char *message, unsigned int len) { unsigned int block_nb; unsigned int new_len, rem_len, tmp_len; const unsigned char *shifted_message; tmp_len = SHA384_512_BLOCK_SIZE - m_len; rem_len = len < tmp_len ? len : tmp_len; memcpy(&m_block[m_len], message, rem_len); if (m_len + len < SHA384_512_BLOCK_SIZE) { m_len += len; return; } new_len = len - rem_len; block_nb = new_len / SHA384_512_BLOCK_SIZE; shifted_message = message + rem_len; transform(m_block, 1); transform(shifted_message, block_nb); rem_len = new_len % SHA384_512_BLOCK_SIZE; memcpy(m_block, &shifted_message[block_nb << 7], rem_len); m_len = rem_len; m_tot_len += (block_nb + 1) << 7; } void SHA512::final(unsigned char *digest) { unsigned int block_nb; unsigned int pm_len; unsigned int len_b; int i; block_nb = 1 + ((SHA384_512_BLOCK_SIZE - 17) < (m_len % SHA384_512_BLOCK_SIZE)); len_b = (m_tot_len + m_len) << 3; pm_len = block_nb << 7; 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_UNPACK64(m_h[i], &digest[i << 3]); } } std::string sha512(std::string input) { unsigned char digest[SHA512::DIGEST_SIZE]; memset(digest,0,SHA512::DIGEST_SIZE); SHA512 ctx = SHA512(); ctx.init(); ctx.update((unsigned char*)input.c_str(), input.length()); ctx.final(digest); char buf[2*SHA512::DIGEST_SIZE+1]; buf[2*SHA512::DIGEST_SIZE] = 0; for (int i = 0; i < SHA512::DIGEST_SIZE; i++) sprintf(buf+i*2, "%02x", digest[i]); return std::string(buf); }
LICENSE.txt
/* * Updated to C++, zedwood.com 2012 * Based on Olivier Gay's version * See Modified BSD License below: * * FIPS 180-2 SHA-224/256/384/512 implementation * Issue date: 04/30/2005 * http://www.ouah.org/ogay/sha2/ * * Copyright (C) 2005, 2007 Olivier Gay <olivier.gay@a3.epfl.ch> * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the project nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */
code snippets are licensed under Creative Commons CC-By-SA 3.0 (unless otherwise specified)
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Dave McKellar
on
2015-05-12 23:30:30
I would move the macros like
#define SHA2_SHFR(x, n) (x >> n) to the .cpp file. |
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