shapp——一个计算sha256的命令行小工具的实现

科技前沿 • 2025-03-19 23:45 • 阅读 47

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此工具从openssl源码中抠出部分代码，实现了一个类sha256。代码是匆匆从openssl里面抠出来的，没有经过细心整理。

头文件：sha256.h

#pragma once  #include <string>  #define SHA_LONG unsigned int  #define SHA_LBLOCK 16 //#define SHA_LAST_BLOCK (SHA_CBLOCK-8)  #define SHA256_CBLOCK (SHA_LBLOCK*4) /* SHA-256 treats input data as a * contiguous array of 32 bit * wide big-endian values. */ #define SHA256_DIGEST_LENGTH 32  #define DATA_ORDER_IS_BIG_ENDIAN  typedef struct SHA256state_st { SHA_LONG h[8]; SHA_LONG Nl,Nh; SHA_LONG data[SHA_LBLOCK]; unsigned int num,md_len; } SHA256_CTX; //替换定义于通用算法里面的那些宏 #define HASH_LONG SHA_LONG  #define HASH_CTX SHA256_CTX #define HASH_CBLOCK SHA256_CBLOCK  #define MD32_REG_T long  #define X(i) XXi  #define HASH_MAKE_STRING(c,s) do { \ unsigned long ll; \ unsigned int nn; \ for (nn=0;nn<SHA256_DIGEST_LENGTH/4;nn++) \ { ll=(c)->h[nn]; (void)HOST_l2c(ll,(s)); } \ } while (0) //来源于md32_common.h的定义，用于大端对齐DATA_ORDER_IS_BIG_ENDIAN #define HOST_c2l(c,l) (l =(((unsigned long)(*((c)++)))<<24), \ l|=(((unsigned long)(*((c)++)))<<16), \ l|=(((unsigned long)(*((c)++)))<< 8), \ l|=(((unsigned long)(*((c)++))) ), \ l) #define HOST_l2c(l,c) (*((c)++)=(unsigned char)(((l)>>24)&0xff), \ *((c)++)=(unsigned char)(((l)>>16)&0xff), \ *((c)++)=(unsigned char)(((l)>> 8)&0xff), \ *((c)++)=(unsigned char)(((l) )&0xff), \ l) class sha256 { public: sha256(void); ~sha256(void); public: void sha(const std::string& src, std::string& out); private: int init(SHA256_CTX *c); int update(SHA256_CTX *c, const void *data_, size_t len); int final(unsigned char *md, HASH_CTX *c); void sha256_block_data_order (SHA256_CTX *c, const void *p, size_t num); };

讯享网

源文件sha256.cpp

讯享网#include "StdAfx.h" #include "sha256.h" #include <sstream> #include <iomanip> sha256::sha256(void) { } sha256::~sha256(void) { } void sha256::sha(const std::string& src, std::string& out) { SHA256_CTX c; unsigned char m[SHA256_DIGEST_LENGTH]; memset(m,0,sizeof(m)); init(&c); update(&c,src.c_str(),src.length()); final(m,&c); //OPENSSL_cleanse(&c,sizeof(c)); std::stringstream hex; char buf[3]= { 
  
    
  0}; for (int i = 0; i < SHA256_DIGEST_LENGTH; ++i) { memset(buf,0,sizeof(buf)); sprintf_s(buf,sizeof(buf),"%02X",m[i]); hex<<buf; } out = hex.str(); } int sha256::init(SHA256_CTX *c) { memset (c,0,sizeof(*c)); c->h[0]=0x6a09e667UL; c->h[1]=0xbb67ae85UL; c->h[2]=0x3c6ef372UL; c->h[3]=0xa54ff53aUL; c->h[4]=0x510e527fUL; c->h[5]=0x9b05688cUL; c->h[6]=0x1f83d9abUL; c->h[7]=0x5be0cd19UL; c->md_len=SHA256_DIGEST_LENGTH; return 1; } //通用的算法，定义于openssl/md32_common.h 的HASH_UPDATE #define HASH_BLOCK_DATA_ORDER sha256_block_data_order int sha256::update(SHA256_CTX *c, const void *data_, size_t len) { const unsigned char *data=

shapp——一个计算sha256的命令行小工具的实现

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