{"id":3353,"date":"2017-06-16T22:59:14","date_gmt":"2017-06-16T14:59:14","guid":{"rendered":"https:\/\/ixyzero.com\/blog\/?p=3353"},"modified":"2017-06-16T22:59:14","modified_gmt":"2017-06-16T14:59:14","slug":"%e7%94%a8c%e8%af%ad%e8%a8%80%e5%ae%9e%e7%8e%b0md5sumsha256sum%e7%9a%84%e5%8a%9f%e8%83%bd","status":"publish","type":"post","link":"https:\/\/ixyzero.com\/blog\/archives\/3353.html","title":{"rendered":"\u7528C\u8bed\u8a00\u5b9e\u73b0md5sum\/sha256sum\u7684\u529f\u80fd"},"content":{"rendered":"

=Start=<\/p>\n

\u7f18\u7531\uff1a<\/h4>\n

\u5b66\u4e60\u9700\u8981<\/p>\n

\u6b63\u6587\uff1a<\/h4>\n

\u53c2\u8003\u89e3\u7b54\uff1a<\/h5>\n
MD5(\u652f\u6301\u6587\u4ef6\u548c\u5b57\u7b26\u4e32)<\/h6>\n
\n
\n
\n
\n\n\n\n
\n
\n
#include <sys\/types.h><\/code><\/div>\n
#include <sys\/stat.h><\/code><\/div>\n
#include <sys\/mman.h><\/code><\/div>\n
#include <fcntl.h><\/code><\/div>\n
#include <stdio.h><\/code><\/div>\n
#include <stdlib.h><\/code><\/div>\n
#include <string.h><\/code><\/div>\n
<\/div>\n
#include <openssl\/md5.h><\/code><\/div>\n
<\/div>\n
int<\/code>\u00a0file_exist(<\/code>char<\/code>\u00a0*filename) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>if<\/code>( access( filename, F_OK ) != -<\/code>1<\/code>\u00a0) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>return<\/code>\u00a01<\/code>;\u00a0\u00a0\u00a0<\/code>\/\/ file exists<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>}\u00a0<\/code>else<\/code>\u00a0{<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>return<\/code>\u00a00<\/code>;\u00a0\u00a0\u00a0<\/code>\/\/ file doesn't exist<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>}<\/code><\/div>\n
}<\/code><\/div>\n
<\/div>\n
void<\/code>\u00a0get_file_hash(<\/code>char<\/code>* filename, unsigned\u00a0<\/code>char<\/code>* digest){<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>MD5_CTX c;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>char<\/code>\u00a0buf[<\/code>1024<\/code>];<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>ssize_t bytes;<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>int<\/code>\u00a0fd = open(filename, O_RDONLY);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>if<\/code>\u00a0(fd == -<\/code>1<\/code>)<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>exit(-<\/code>1<\/code>);<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>MD5_Init(&c);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>bytes = read(fd, buf,\u00a0<\/code>1024<\/code>);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>while<\/code>(bytes >\u00a0<\/code>0<\/code>) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>MD5_Update(&c, buf, bytes);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>bytes=read(fd, buf,\u00a0<\/code>1024<\/code>);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>}<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>MD5_Final(digest, &c);<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>close(fd);<\/code><\/div>\n
}<\/code><\/div>\n
<\/div>\n
void<\/code>\u00a0get_str_hash(<\/code>char<\/code>* str, unsigned\u00a0<\/code>char<\/code>* digest){<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>MD5_CTX c;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>MD5_Init(&c);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>MD5_Update(&c, str, strlen(str));<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>MD5_Final(digest, &c);<\/code><\/div>\n
}<\/code><\/div>\n
<\/div>\n
\/\/ Print the MD5 sum as hex-digits.<\/code><\/div>\n
void<\/code>\u00a0print_md5_sum(unsigned\u00a0<\/code>char<\/code>* md) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>int<\/code>\u00a0i;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>for<\/code>(i=<\/code>0<\/code>; i <MD5_DIGEST_LENGTH; i++) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>printf(<\/code>\"%02x\"<\/code>, md[i]);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>}<\/code><\/div>\n
}<\/code><\/div>\n
<\/div>\n
int<\/code>\u00a0main(<\/code>int<\/code>\u00a0argc,\u00a0<\/code>char<\/code>\u00a0*argv[]) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>printf(<\/code>\"MD5_DIGEST_LENGTH = %d\\n\"<\/code>, MD5_DIGEST_LENGTH);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>unsigned\u00a0<\/code>char<\/code>\u00a0md5_digest[MD5_DIGEST_LENGTH];<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>int<\/code>\u00a0i =\u00a0<\/code>0<\/code>;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>for<\/code>\u00a0(i =\u00a0<\/code>1<\/code>; i < argc; i++) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>printf(<\/code>\"argv[%d] = '%s'\\n\"<\/code>, i, argv[i]);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>if<\/code>\u00a0(file_exist(argv[i])) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>get_file_hash(argv[i], md5_digest);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>print_md5_sum(md5_digest);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>printf(<\/code>\"\\tFile('%s')\\n\\n\"<\/code>, argv[i]);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>}\u00a0<\/code>else<\/code>\u00a0{<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>get_str_hash(argv[i], md5_digest);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>print_md5_sum(md5_digest);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>printf(<\/code>\"\\tString('%s')\\n\\n\"<\/code>, argv[i]);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>}<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>}<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>return<\/code>\u00a00<\/code>;<\/code><\/div>\n
}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
SHA256(\u652f\u6301\u6587\u4ef6\u548c\u5b57\u7b26\u4e32)<\/h6>\n
\n
\n
\n
\n\n\n\n
\n
\n
#include <sys\/types.h><\/code><\/div>\n
#include <sys\/stat.h><\/code><\/div>\n
#include <sys\/mman.h><\/code><\/div>\n
#include <fcntl.h><\/code><\/div>\n
#include <stdio.h><\/code><\/div>\n
#include <stdlib.h><\/code><\/div>\n
#include <string.h><\/code><\/div>\n
<\/div>\n
#include <openssl\/sha.h><\/code><\/div>\n
<\/div>\n
int<\/code>\u00a0file_exist(<\/code>char<\/code>\u00a0*filename) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>if<\/code>( access( filename, F_OK ) != -<\/code>1<\/code>\u00a0) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>return<\/code>\u00a01<\/code>;\u00a0\u00a0\u00a0<\/code>\/\/ file exists<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>}\u00a0<\/code>else<\/code>\u00a0{<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>return<\/code>\u00a00<\/code>;\u00a0\u00a0\u00a0<\/code>\/\/ file doesn't exist<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>}<\/code><\/div>\n
}<\/code><\/div>\n
<\/div>\n
void<\/code>\u00a0get_file_hash(<\/code>char<\/code>* filename, unsigned\u00a0<\/code>char<\/code>* digest){<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>SHA256_CTX c;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>char<\/code>\u00a0buf[<\/code>1024<\/code>];<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>ssize_t bytes;<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>int<\/code>\u00a0fd = open(filename, O_RDONLY);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>if<\/code>\u00a0(fd == -<\/code>1<\/code>)<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>exit(-<\/code>1<\/code>);<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>SHA256_Init(&c);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>bytes = read(fd, buf,\u00a0<\/code>1024<\/code>);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>while<\/code>(bytes >\u00a0<\/code>0<\/code>) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>SHA256_Update(&c, buf, bytes);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>bytes=read(fd, buf,\u00a0<\/code>1024<\/code>);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>}<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>SHA256_Final(digest, &c);<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>close(fd);<\/code><\/div>\n
}<\/code><\/div>\n
<\/div>\n
void<\/code>\u00a0get_str_hash(<\/code>char<\/code>* str, unsigned\u00a0<\/code>char<\/code>* digest){<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>SHA256_CTX c;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>SHA256_Init(&c);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>SHA256_Update(&c, str, strlen(str));<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>SHA256_Final(digest, &c);<\/code><\/div>\n
}<\/code><\/div>\n
<\/div>\n
\/\/ Print the MD5\/SHA1\/SHA256 sum as hex-digits.<\/code><\/div>\n
void<\/code>\u00a0print_hex_hash(unsigned\u00a0<\/code>char<\/code>* digest,\u00a0<\/code>int<\/code>\u00a0length) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>int<\/code>\u00a0i;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>for<\/code>(i=<\/code>0<\/code>; i <length; i++) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>printf(<\/code>\"%02x\"<\/code>, digest[i]);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>}<\/code><\/div>\n
}<\/code><\/div>\n
<\/div>\n
int<\/code>\u00a0main(<\/code>int<\/code>\u00a0argc,\u00a0<\/code>char<\/code>\u00a0*argv[]) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>printf(<\/code>\"SHA256_DIGEST_LENGTH = %d\\n\"<\/code>, SHA256_DIGEST_LENGTH);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>unsigned\u00a0<\/code>char<\/code>\u00a0sha256_digest[SHA256_DIGEST_LENGTH];<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>int<\/code>\u00a0i =\u00a0<\/code>0<\/code>;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>for<\/code>\u00a0(i =\u00a0<\/code>1<\/code>; i < argc; i++) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>printf(<\/code>\"argv[%d] = '%s'\\n\"<\/code>, i, argv[i]);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>if<\/code>\u00a0(file_exist(argv[i])) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>get_file_hash(argv[i], sha256_digest);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>print_hex_hash(sha256_digest, SHA256_DIGEST_LENGTH);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>printf(<\/code>\"\\tFile('%s')\\n\\n\"<\/code>, argv[i]);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>}\u00a0<\/code>else<\/code>\u00a0{<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>get_str_hash(argv[i], sha256_digest);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>print_hex_hash(sha256_digest, SHA256_DIGEST_LENGTH);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>printf(<\/code>\"\\tString('%s')\\n\\n\"<\/code>, argv[i]);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>}<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>}<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>return<\/code>\u00a00<\/code>;<\/code><\/div>\n
}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
\u53c2\u8003\u94fe\u63a5\uff1a<\/h5>\n

md5sum of file in Linux C<\/span> #\u57fa\u4e8eopenssl\uff0c\u4ece\u6807\u51c6\u8f93\u5165\u8bfb\u53d6\u5185\u5bb9\u8fdb\u884c\u8ba1\u7b97
\nhttps:\/\/stackoverflow.com\/questions\/3395690\/md5sum-of-file-in-linux-c<\/a>
\nhttp:\/\/www.unix.com\/programming\/134079-computing-md5sum-c.html<\/a><\/p>\n

How to calculate the MD5 hash of a large file in C?<\/span><\/strong> #\u8ba1\u7b97\u5927\u6587\u4ef6\u7684\u54c8\u5e0c\u503c(\u5206\u5757\u8bfb\u53d6)
\nhttps:\/\/stackoverflow.com\/questions\/10324611\/how-to-calculate-the-md5-hash-of-a-large-file-in-c<\/a><\/p>\n

\u4f7f\u7528 mmap \u7684\u65b9\u5f0f\u5c06\u6587\u4ef6\u5185\u5bb9\u8bfb\u5165\u5185\u5b58(\u9002\u4e8e\u5c0f\u6587\u4ef6)
\nhttps:\/\/stackoverflow.com\/questions\/1220046\/how-to-get-the-md5-hash-of-a-file-in-c<\/a><\/p>\n

https:\/\/linux.die.net\/man\/3\/md5_update<\/a>
\nhttps:\/\/linux.die.net\/man\/3\/sha<\/a>
\nhttps:\/\/www.openssl.org\/docs\/man1.0.2\/crypto\/MD5.html<\/a>
\nhttps:\/\/www.openssl.org\/docs\/man1.0.2\/crypto\/sha.html<\/a><\/p>\n

\u5404\u79cd\u8bed\u8a00\u7684MD5\u6458\u8981\u5b9e\u73b0
\nhttp:\/\/userpages.umbc.edu\/~mabzug1\/cs\/md5\/md5.html<\/a>
\nhttp:\/\/people.csail.mit.edu\/rivest\/Md5.c<\/a><\/p>\n

\u8ba1\u7b97\u5b57\u7b26\u4e32\u7684MD5\u6458\u8981<\/span>
\nhttps:\/\/stackoverflow.com\/questions\/7627723\/how-to-create-a-md5-hash-of-a-string-in-c<\/a><\/p>\n

\u5728C\u8bed\u8a00\u4e2d\u68c0\u6d4b\u6587\u4ef6\u662f\u5426\u5b58\u5728\u7684\u65b9\u6cd5<\/span>
\nhttps:\/\/stackoverflow.com\/questions\/230062\/whats-the-best-way-to-check-if-a-file-exists-in-c-cross-platform<\/a><\/p>\n

=END=<\/p>\n","protected":false},"excerpt":{"rendered":"

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