127 lines
2.6 KiB
C
127 lines
2.6 KiB
C
#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <sqlite3.h>
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#include <ctype.h>
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#include <openssl/sha.h>
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char *hash_sha256(char *pass, char *salt) {
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char *buffer = (char *)malloc(strlen(pass) + strlen(salt) + 1);
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char *shash = (char *)malloc(66);
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unsigned char hash[SHA256_DIGEST_LENGTH];
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if (!buffer) {
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printf("Out of memory!");
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exit(-1);
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}
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sprintf(buffer, "%s%s", pass, salt);
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SHA256_CTX sha256;
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SHA256_Init(&sha256);
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SHA256_Update(&sha256, buffer, strlen(buffer));
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SHA256_Final(hash, &sha256);
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int i = 0;
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for(i = 0; i < SHA256_DIGEST_LENGTH; i++) {
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sprintf(shash + (i * 2), "%02x", hash[i]);
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}
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shash[64] = 0;
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free(buffer);
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return shash;
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}
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void gen_salt(char **s) {
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FILE *fptr;
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int i;
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char c;
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*s = (char *)malloc(11);
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char *salt = *s;
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if (!salt) {
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printf("Out of memory..");
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exit(-1);
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}
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fptr = fopen("/dev/urandom", "rb");
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if (!fptr) {
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printf("Unable to open /dev/urandom!");
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exit(-1);
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}
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for (i=0;i<10;i++) {
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fread(&c, 1, 1, fptr);
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salt[i] = (char)((abs(c) % 93) + 33);
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}
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fclose(fptr);
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salt[10] = '\0';
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}
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int main(int argc, char **argv) {
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sqlite3 *db;
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sqlite3_stmt *res;
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sqlite3_stmt *res2;
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char *alter_table_sql = "ALTER TABLE users ADD COLUMN salt TEXT";
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char *select_sql = "SELECT Id,password FROM users";
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char *update_sql = "UPDATE users SET password=?, salt=? WHERE Id=?";
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char *err_msg = 0;
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int id;
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int rc;
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char *password;
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char *hash;
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char *salt;
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rc = sqlite3_open(argv[1], &db);
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if (rc != SQLITE_OK) {
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printf("Error opening database\n");
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return -1;
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}
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sqlite3_busy_timeout(db, 5000);
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rc = sqlite3_exec(db, alter_table_sql, 0, 0, &err_msg);
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if (rc != SQLITE_OK ) {
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printf("SQL error: %s\n", err_msg);
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sqlite3_free(err_msg);
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sqlite3_close(db);
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return 1;
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}
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rc = sqlite3_prepare_v2(db, select_sql, -1, &res, 0);
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if (rc != SQLITE_OK) {
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printf("Cannot prepare statement: %s\n", sqlite3_errmsg(db));
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sqlite3_close(db);
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exit(1);
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}
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while (sqlite3_step(res) == SQLITE_ROW) {
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id = sqlite3_column_int(res, 0);
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password = strdup(sqlite3_column_text(res, 1));
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gen_salt(&salt);
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hash = hash_sha256(password, salt);
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rc = sqlite3_prepare_v2(db, update_sql, -1, &res2, 0);
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if (rc != SQLITE_OK) {
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printf("Cannot prepare statement: %s\n", sqlite3_errmsg(db));
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sqlite3_close(db);
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exit(1);
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}
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sqlite3_bind_text(res2, 1, hash, -1, 0);
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sqlite3_bind_text(res2, 2, salt, -1, 0);
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sqlite3_bind_int(res2, 3, id);
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rc = sqlite3_step(res2);
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if (rc != SQLITE_DONE) {
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printf("Error: %s\n", sqlite3_errmsg(db));
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exit(1);
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}
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sqlite3_finalize(res2);
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}
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printf("Converted!\n");
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sqlite3_finalize(res);
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sqlite3_close(db);
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}
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