Using sqlite3_key to open a SQLCipher db in Objective-C

openDB.m

#import <sqlite3.h>

NSString *databasePath = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0]
                          stringByAppendingPathComponent: @"sqlcipher.db"];
sqlite3 *db;
bool sqlcipher_valid = NO;

if (sqlite3_open([databasePath UTF8String], &db) == SQLITE_OK) {
    const char* key = [@"BIGSecret" UTF8String];
    sqlite3_key(db, key, strlen(key));
    if (sqlite3_exec(db, (const char*) "SELECT count(*) FROM sqlite_master;", NULL, NULL, NULL) == SQLITE_OK) {
      if(sqlite3_prepare_v2(database, "PRAGMA cipher_version;", -1, &stmt, NULL) == SQLITE_OK) {
        if(sqlite3_step(stmt)== SQLITE_ROW) {
          const unsigned char *ver = sqlite3_column_text(stmt, 0);
          if(ver != NULL) {
            sqlcipher_valid = YES;

            // password is correct (or database initialize), and verified to be using sqlcipher

          }
        }
        sqlite3_finalize(stmt);
      }
    }
    sqlite3_close(db);
}