Drupal > v7.x Hash

What is Drupal > v7.x?

The Drupal v7.x cryptographic hash format was introduced as part of Drupal 7’s user password storage mechanism, designed to balance security with performance for web applications. Originating as an evolution of earlier PHP-based password hashing schemes, it employs a **SHA-256-based** algorithm with a **work factor** (iterations) to slow down brute-force attacks. The format consists of a **prefix** (`$S1$`, `$S2$`, or `$S3$`), followed by a **salt** (a 22-character hexadecimal string), the **hash algorithm identifier** (e.g., `SHA-256`), the **iteration count** (expressed as a 5-digit number), and the **hashed password** itself. The primary use-case was to store user credentials in a way that resisted offline attacks while remaining computationally feasible for real-time authentication, leveraging PHP’s built-in `password_hash()` and `password_verify()` functions. However, its design prioritized compatibility with legacy systems over modern cryptographic best practices, particularly in iteration flexibility and salt handling.

The Drupal v7.x format is vulnerable to cracking due to several architectural flaws. First, its **variable iteration count** (ranging from 100 to 999,999) can be optimized away via **side-channel attacks** or **GPU/ASIC acceleration**, as modern hardware can brute-force SHA-256 at rates exceeding 100M hashes per second. Second, the **salt is not cryptographically random**—it is derived from the password and a fixed prefix, introducing predictability that weakens uniqueness. Third, the **lack of a fixed iteration count** allows attackers to dynamically adjust work factors, rendering the "defense in depth" ineffective. Finally, the format’s reliance on **SHA-256** (without key stretching) makes it susceptible to **rainbow table attacks** if iteration counts are low, and its **plaintext salt storage** (in some implementations) exposes salts to offline dictionary attacks. These weaknesses were exacerbated by Drupal’s default iteration count of **1000**, which was considered insufficient by modern standards even at its release.

Identifying Drupal > v7.x Hashes

Identifying a hash blindly is often difficult because multiple algorithms can output strings of the exact same length. For example, a standard 32-character hexadecimal string could be MD5, NTLM, MD4, or LM. To definitively identify Drupal > v7.x, security researchers analyze the hash against a strict regular expression (regex) signature (shown above) to find structural matches.

How to Crack Drupal > v7.x

If you need to recover the plaintext password for a Drupal > v7.x hash during a penetration test or forensics investigation, you must supply the correct module ID to your cracking software. Use the exact commands provided at the top of this page to target the hash successfully.