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"""Mbed TLS build tree information and manipulation.
"""
# Copyright The Mbed TLS Contributors
# SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
#
import os
import inspect
import re
from typing import Optional
def looks_like_tf_psa_crypto_root(path: str) -> bool:
"""Whether the given directory looks like the root of the PSA Crypto source tree."""
try:
with open(os.path.join(path, 'scripts', 'project_name.txt'), 'r') as f:
return f.read() == "TF-PSA-Crypto\n"
except FileNotFoundError:
return False
def looks_like_mbedtls_root(path: str) -> bool:
"""Whether the given directory looks like the root of the Mbed TLS source tree."""
try:
with open(os.path.join(path, 'scripts', 'project_name.txt'), 'r') as f:
return f.read() == "Mbed TLS\n"
except FileNotFoundError:
return False
def looks_like_root(path: str) -> bool:
return looks_like_tf_psa_crypto_root(path) or looks_like_mbedtls_root(path)
def crypto_core_directory(root: Optional[str] = None, relative: Optional[bool] = False) -> str:
"""
Return the path of the directory containing the PSA crypto core
for either TF-PSA-Crypto or Mbed TLS.
Returns either the full path or relative path depending on the
"relative" boolean argument.
"""
if root is None:
root = guess_project_root()
if looks_like_tf_psa_crypto_root(root):
if relative:
return "core"
return os.path.join(root, "core")
elif looks_like_mbedtls_root(root):
if is_mbedtls_3_6():
path = "library"
else:
path = "tf-psa-crypto/core"
if relative:
return path
return os.path.join(root, path)
else:
raise Exception('Neither Mbed TLS nor TF-PSA-Crypto source tree found')
def crypto_library_filename(root: Optional[str] = None) -> str:
"""Return the crypto library filename for either TF-PSA-Crypto or Mbed TLS."""
if root is None:
root = guess_project_root()
if looks_like_tf_psa_crypto_root(root):
return "tfpsacrypto"
elif looks_like_mbedtls_root(root):
return "mbedcrypto"
else:
raise Exception('Neither Mbed TLS nor TF-PSA-Crypto source tree found')
def check_repo_path():
"""Check that the current working directory is the project root, and throw
an exception if not.
"""
if not all(os.path.isdir(d) for d in ["include", "library", "tests"]):
raise Exception("This script must be run from Mbed TLS root")
def chdir_to_root() -> None:
"""Detect the root of the Mbed TLS or TF-PSA-Crypto source tree and change to it.
The current directory must be up to two levels deep inside an Mbed TLS or
TF-PSA-Crypto source tree.
"""
for d in [os.path.curdir,
os.path.pardir,
os.path.join(os.path.pardir, os.path.pardir)]:
if looks_like_root(d):
os.chdir(d)
return
raise Exception('Mbed TLS or TF-PSA-Crypto source tree not found')
def guess_project_root():
"""Guess project source code directory.
Return the first possible project root directory.
"""
dirs = set({})
for frame in inspect.stack():
path = os.path.dirname(frame.filename)
for d in ['.', os.path.pardir] \
+ [os.path.join(*([os.path.pardir]*i)) for i in range(2, 10)]:
d = os.path.abspath(os.path.join(path, d))
if d in dirs:
continue
dirs.add(d)
if looks_like_root(d):
return d
raise Exception('Neither Mbed TLS nor TF-PSA-Crypto source tree found')
def guess_mbedtls_root(root: Optional[str] = None) -> str:
"""Guess Mbed TLS source code directory.
Return the first possible Mbed TLS root directory.
Raise an exception if we are not in Mbed TLS.
"""
if root is None:
root = guess_project_root()
if looks_like_mbedtls_root(root):
return root
else:
raise Exception('Mbed TLS source tree not found')
def guess_tf_psa_crypto_root(root: Optional[str] = None) -> str:
"""Guess TF-PSA-Crypto source code directory.
Return the first possible TF-PSA-Crypto root directory.
Raise an exception if we are not in TF-PSA-Crypto.
"""
if root is None:
root = guess_project_root()
if looks_like_tf_psa_crypto_root(root):
return root
else:
raise Exception('TF-PSA-Crypto source tree not found')
def framework_root(root: Optional[str] = None) -> str:
"""Return the path to the framework directory for this project."""
if root is None:
root = guess_project_root()
return os.path.join(root, 'framework')
def is_mbedtls_3_6() -> bool:
"""Whether the working tree is an Mbed TLS 3.6 one or not
Return false if we are in TF-PSA-Crypto or in Mbed TLS but with a version
different from 3.6.x.
Raise an exception if we are neither in Mbed TLS nor in TF-PSA-Crypto.
"""
root = guess_project_root()
if not looks_like_mbedtls_root(root):
return False
with open(os.path.join(root, 'include', 'mbedtls', 'build_info.h'), 'r') as f:
return re.search(r"#define MBEDTLS_VERSION_NUMBER.*0x0306", f.read()) is not None
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