function encryption_get_key

7.x encryption.module encryption_get_key()
6.x encryption.module encryption_get_key()

Returns back a suitable key, either from our string or file location.

We are going to convert either one into a SHA1 string

4 calls to encryption_get_key()
content_add_new_uploaded_file in modules/content/content.module
bool_replace_existing means should we replace an existing file (based on filename) with this new one? Instead of creating an INSERT, that is.
encryption_decrypt in modules/encryption/encryption.module
This will decrypt an encrypted string.
encryption_encrypt in modules/encryption/encryption.module
student_files_handle_upload in modules/student_files/student_files.module
Handles the upload of a file which we assume is located at $_FILES["student_file_upload_file"], or the provided $file array.

File

modules/encryption/encryption.module, line 216
This is the main module file for the encryption module.

Code

function encryption_get_key() {

  $encryption_key_path = trim(variable_get("encryption_key_path", ""));

  if ($encryption_key_path != "") {
    $contents = trim(file_get_contents($encryption_key_path));
    if ($contents) {
      $encryption_key_string = openssl_digest($contents, "sha256", TRUE);
    }
  }
  else {
    if (!isset($GLOBALS ['encryption_key_string'])) {
      fp_add_message("No encryption key has been set.  The encrypt module will cause unforseen problems.", "error");
      return FALSE;
    }
    $encryption_key_string = openssl_digest($GLOBALS ['encryption_key_string'], "sha256", TRUE);
  }


  if (!$encryption_key_string) {
    fp_add_message("No encryption key has been set.  The encrypt module will cause unforseen problems.  Do not proceed until this issue is corrected.", "error");
    return FALSE;
  }


  /*
  //I don't think this is true anymore...
  // The key must be a smaller size than the hash algorithm we have chosen.  This is because our AES encryption is 128 bit, meaning
  // they key must be 256 bits or less (32 characters).  We will take a substring for 32 chars in this case. 
  //$encryption_key_string = substr($encryption_key_string, 0, 32);
  */


  return $encryption_key_string;

}