c++ - convert php code to C (sha1 algorithm) -

c++ - convert php code to C (sha1 algorithm) -

php code:

<?php $pass = "12345678"; $salt = "1234"; echo sha1($salt.$pass.$salt); ?>

my c code utilize sha1 using openssl crypto library at:http://www.openssl.org/docs/crypto/sha.html.

#include <openssl/sha.h> int main() { const char str[] = "original string"; const char salt[] = "1234"; const char pass[] = "12345678"; strcat(str, salt, pass); unsigned char hash[sha_digest_length]; // == 20 sha1(str, sizeof(str) - 1, hash); // stuff hash homecoming 0; }

my question is, how can modify c code exact same thing php code? thanks.

you need allocate plenty space in string concatenated string. also, can't modify const char, don't utilize modifier on variable you're concatenating into.

char str[17] = ""; // 16 characters plus null terminator const char salt[] = "1234"; const char pass[] = "12345678"; unsigned char hash[sha_digest_length+1]; // +1 null terminator strcpy(str, salt); strcat(str, pass); // strcat() takes 2 arguments, need phone call twice strcat(str, salt); sha1(str, strlen(str), hash);

you should consider using std::string instead of char arrays in c++.

php c++ cryptography converter sha1