Remove regexp shenanigins (#354)

They aren't required now that we no longer use the OpenBSD library

src/_bcrypt/src/lib.rs

@@ -28,10 +28,11 @@
     if raw_parts.len() != 3 {
         return Err(pyo3::exceptions::PyValueError::new_err("Invalid salt"));
     }
-    if raw_parts[0] != b"2y"
-        && raw_parts[0] != b"2b"
-        && raw_parts[0] != b"2a"
-        && raw_parts[0] != b"2x"
-    {
+    let version = match raw_parts[0] {
+        b"2y" => bcrypt::Version::TwoY,
+        b"2b" => bcrypt::Version::TwoB,
+        b"2a" => bcrypt::Version::TwoA,
+        b"2x" => bcrypt::Version::TwoX,
+        _ => {
             return Err(pyo3::exceptions::PyValueError::new_err("Invalid salt"));
         }
@@ -36,5 +37,6 @@
             return Err(pyo3::exceptions::PyValueError::new_err("Invalid salt"));
         }
+    };
     let cost = std::str::from_utf8(raw_parts[1])
         .map_err(|_| pyo3::exceptions::PyValueError::new_err("Invalid salt"))?
         .parse::<u32>()
@@ -50,7 +52,7 @@
     let hashed = bcrypt::hash_with_salt(password, cost, raw_salt).unwrap();
     Ok(pyo3::types::PyBytes::new(
         py,
-        hashed.format_for_version(bcrypt::Version::TwoB).as_bytes(),
+        hashed.format_for_version(version).as_bytes(),
     ))
 }
 
@@ -62,8 +64,8 @@
     rounds: u32,
     desired_key_bytes: usize,
 ) -> pyo3::PyResult<&'p pyo3::types::PyBytes> {
-    pyo3::types::PyBytes::new_with(py, desired_key_bytes, |mut output| {
-        bcrypt_pbkdf::bcrypt_pbkdf(password, salt, rounds, &mut output).unwrap();
+    pyo3::types::PyBytes::new_with(py, desired_key_bytes, |output| {
+        bcrypt_pbkdf::bcrypt_pbkdf(password, salt, rounds, output).unwrap();
         Ok(())
     })
 }

src/bcrypt/__init__.py

@@ -18,7 +18,6 @@
 
 import hmac
 import os
-import re
 import warnings
 
 from .__about__ import (
@@ -50,9 +49,6 @@
 ]
 
 
-_normalize_re = re.compile(rb"^\$2y\$")
-
-
 def gensalt(rounds: int = 12, prefix: bytes = b"2b") -> bytes:
     if prefix not in (b"2a", b"2b"):
         raise ValueError("Supported prefixes are b'2a' or b'2b'")
@@ -88,23 +84,7 @@
     # on $2a$, so we do it here to preserve compatibility with 2.0.0
     password = password[:72]
 
-    # When the original 8bit bug was found the original library we supported
-    # added a new prefix, $2y$, that fixes it. This prefix is exactly the same
-    # as the $2b$ prefix added by OpenBSD other than the name. Since the
-    # OpenBSD library does not support the $2y$ prefix, if the salt given to us
-    # is for the $2y$ prefix, we'll just mugne it so that it's a $2b$ prior to
-    # passing it into the C library.
-    original_salt, salt = salt, _normalize_re.sub(b"$2b$", salt)
-
-    hashed = _bcrypt.hashpass(password, salt)
-
-    # Now that we've gotten our hashed password, we want to ensure that the
-    # prefix we return is the one that was passed in, so we'll use the prefix
-    # from the original salt and concatenate that with the return value (minus
-    # the return value's prefix). This will ensure that if someone passed in a
-    # salt with a $2y$ prefix, that they get back a hash with a $2y$ prefix
-    # even though we munged it to $2b$.
-    return original_salt[:4] + hashed[4:]
+    return _bcrypt.hashpass(password, salt)
 
 
 def checkpw(password: bytes, hashed_password: bytes) -> bool: