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文件sha校验工具[支持大文件，本站不会上传文件到服务器，请放心使用]：
sha是什么
安全散列算法（英语：Secure Hash Algorithm，缩写为SHA）是一个密码散列函数家族，是FIPS所认证的安全散列算法。能计算出一个数字消息所对应到的，长度固定的字符串（又称消息摘要）的算法。且若输入的消息不同，它们对应到不同字符串的机率很高。
sha家族成员
SHA家族的五个算法，分别是SHA-1、SHA-224、SHA-256、SHA-384，和SHA-512，由美国国家安全局（NSA）所设计，并由美国国家标准与技术研究院（NIST）发布；是美国的政府标准。后四者有时并称为SHA-2。SHA-1在许多安全协定中广为使用，包括TLS和SSL、PGP、SSH、S/MIME和IPsec，曾被视为是MD5（更早之前被广为使用的杂凑函数）的后继者。但SHA-1的安全性如今被密码学家严重质疑；虽然至今尚未出现对SHA-2有效的攻击，它的算法跟SHA-1基本上仍然相似；因此有些人开始发展其他替代的杂凑算法。
| 成员名称 | 为避免混淆使用的非正式名称 |
|---|---|
| SHA | SHA-0 |
| SHA-1 | SHA-1 |
| SHA-224 | SHA-2 |
| SHA-256 | |
| SHA-384 | |
| SHA-512 | |
| SHA-3 | SHA-3 |
SHA-1
SHA-1（英语：Secure Hash Algorithm 1，中文名：安全散列算法1）是一种密码散列函数，美国国家安全局设计，并由美国国家标准技术研究所（NIST）发布为联邦数据处理标准（FIPS）。SHA-1可以生成一个被称为消息摘要的160位（20字节）散列值，散列值通常的呈现形式为40个十六进制数。
SHA-2
SHA-2，名称来自于安全散列算法2（英语：Secure Hash Algorithm 2）的缩写，一种密码散列函数算法标准，由美国国家安全局研发，由美国国家标准与技术研究院（NIST）在2001年发布。属于SHA算法之一，是SHA-1的后继者。其下又可再分为六个不同的算法标准，包括了：SHA-224、SHA-256、SHA-384、SHA-512、SHA-512/224、SHA-512/256。
SHA-1算法 伪代码
Initialize variables: h0 := 0x67452301 h1 := 0xEFCDAB89 h2 := 0x98BADCFE h3 := 0x10325476 h4 := 0xC3D2E1F0 Pre-processing: append the bit '1' to the message append k bits '0', where k is the minimum number >= 0 such that the resulting message length (in bits) is congruent to 448 (mod 512) append length of message (before pre-processing), in bits, as 64-bit big-endian integer Process the message in successive 512-bit chunks: break message into 512-bit chunks for each chunk break chunk into sixteen 32-bit big-endian words w[i], 0 ≤ i ≤ 15 Extend the sixteen 32-bit words into eighty 32-bit words: for i from 16 to 79 w[i] := (w[i-3] xor w[i-8] xor w[i-14] xor w[i-16]) leftrotate 1 Initialize hash value for this chunk: a := h0 b := h1 c := h2 d := h3 e := h4 Main loop: for i from 0 to 79 if 0 ≤ i ≤ 19 then f := (b and c) or ((not b) and d) k := 0x5A827999 else if 20 ≤ i ≤ 39 f := b xor c xor d k := 0x6ED9EBA1 else if 40 ≤ i ≤ 59 f := (b and c) or (b and d) or (c and d) k := 0x8F1BBCDC else if 60 ≤ i ≤ 79 f := b xor c xor d k := 0xCA62C1D6 temp := (a leftrotate 5) + f + e + k + w[i] e := d d := c c := b leftrotate 30 b := a a := temp Add this chunk's hash to result so far: h0 := h0 + a h1 := h1 + b h2 := h2 + c h3 := h3 + d h4 := h4 + e Produce the final hash value (big-endian): digest = hash = h0 append h1 append h2 append h3 append h4
SHA-512算法 c++实现
//SHA512.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+2];
buf[2*SHA512::DIGEST_SIZE] = 0;
for (int i = 0; i < SHA512::DIGEST_SIZE; i++)
sprintf(buf+i*2, "%02x", digest[i]);
//在Visual Studio中为防止溢出要改成sprintf_s(buf+i*2,sizeof(buf),"%02x", digest[i]);
return std::string(buf);
}
//main.cpp
#include <iostream>
#include "sha512.h"
using namespace std;
int main(int argc, char *argv[])
{
string plain_text = "This is a SHA215 example";
string sha512_code= sha512(plain_text);
cout<<plain_text<<"通过sha512获得的摘要值："<< sha512_code<< endl;
system("pause");
return 0;
}