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# This file is dual licensed under the terms of the Apache License, Version
# 2.0, and the BSD License. See the LICENSE file in the root of this repository
# for complete details.
from cryptography import exceptions
from cryptography.hazmat.primitives import serialization
from cryptography.hazmat.primitives.asymmetric.ed25519 import (
Ed25519PrivateKey,
Ed25519PublicKey,
_ED25519_KEY_SIZE,
_ED25519_SIG_SIZE,
)
class _Ed25519PublicKey(Ed25519PublicKey):
def __init__(self, backend, evp_pkey):
self._backend = backend
self._evp_pkey = evp_pkey
def public_bytes(
self,
encoding: serialization.Encoding,
format: serialization.PublicFormat,
) -> bytes:
if (
encoding is serialization.Encoding.Raw
or format is serialization.PublicFormat.Raw
):
if (
encoding is not serialization.Encoding.Raw
or format is not serialization.PublicFormat.Raw
):
raise ValueError(
"When using Raw both encoding and format must be Raw"
)
return self._raw_public_bytes()
return self._backend._public_key_bytes(
encoding, format, self, self._evp_pkey, None
)
def _raw_public_bytes(self) -> bytes:
buf = self._backend._ffi.new("unsigned char []", _ED25519_KEY_SIZE)
buflen = self._backend._ffi.new("size_t *", _ED25519_KEY_SIZE)
res = self._backend._lib.EVP_PKEY_get_raw_public_key(
self._evp_pkey, buf, buflen
)
self._backend.openssl_assert(res == 1)
self._backend.openssl_assert(buflen[0] == _ED25519_KEY_SIZE)
return self._backend._ffi.buffer(buf, _ED25519_KEY_SIZE)[:]
def verify(self, signature: bytes, data: bytes) -> None:
evp_md_ctx = self._backend._lib.EVP_MD_CTX_new()
self._backend.openssl_assert(evp_md_ctx != self._backend._ffi.NULL)
evp_md_ctx = self._backend._ffi.gc(
evp_md_ctx, self._backend._lib.EVP_MD_CTX_free
)
res = self._backend._lib.EVP_DigestVerifyInit(
evp_md_ctx,
self._backend._ffi.NULL,
self._backend._ffi.NULL,
self._backend._ffi.NULL,
self._evp_pkey,
)
self._backend.openssl_assert(res == 1)
res = self._backend._lib.EVP_DigestVerify(
evp_md_ctx, signature, len(signature), data, len(data)
)
if res != 1:
self._backend._consume_errors()
raise exceptions.InvalidSignature
class _Ed25519PrivateKey(Ed25519PrivateKey):
def __init__(self, backend, evp_pkey):
self._backend = backend
self._evp_pkey = evp_pkey
def public_key(self) -> Ed25519PublicKey:
buf = self._backend._ffi.new("unsigned char []", _ED25519_KEY_SIZE)
buflen = self._backend._ffi.new("size_t *", _ED25519_KEY_SIZE)
res = self._backend._lib.EVP_PKEY_get_raw_public_key(
self._evp_pkey, buf, buflen
)
self._backend.openssl_assert(res == 1)
self._backend.openssl_assert(buflen[0] == _ED25519_KEY_SIZE)
public_bytes = self._backend._ffi.buffer(buf)[:]
return self._backend.ed25519_load_public_bytes(public_bytes)
def sign(self, data: bytes) -> bytes:
evp_md_ctx = self._backend._lib.EVP_MD_CTX_new()
self._backend.openssl_assert(evp_md_ctx != self._backend._ffi.NULL)
evp_md_ctx = self._backend._ffi.gc(
evp_md_ctx, self._backend._lib.EVP_MD_CTX_free
)
res = self._backend._lib.EVP_DigestSignInit(
evp_md_ctx,
self._backend._ffi.NULL,
self._backend._ffi.NULL,
self._backend._ffi.NULL,
self._evp_pkey,
)
self._backend.openssl_assert(res == 1)
buf = self._backend._ffi.new("unsigned char[]", _ED25519_SIG_SIZE)
buflen = self._backend._ffi.new("size_t *", len(buf))
res = self._backend._lib.EVP_DigestSign(
evp_md_ctx, buf, buflen, data, len(data)
)
self._backend.openssl_assert(res == 1)
self._backend.openssl_assert(buflen[0] == _ED25519_SIG_SIZE)
return self._backend._ffi.buffer(buf, buflen[0])[:]
def private_bytes(
self,
encoding: serialization.Encoding,
format: serialization.PrivateFormat,
encryption_algorithm: serialization.KeySerializationEncryption,
) -> bytes:
if (
encoding is serialization.Encoding.Raw
or format is serialization.PublicFormat.Raw
):
if (
format is not serialization.PrivateFormat.Raw
or encoding is not serialization.Encoding.Raw
or not isinstance(
encryption_algorithm, serialization.NoEncryption
)
):
raise ValueError(
"When using Raw both encoding and format must be Raw "
"and encryption_algorithm must be NoEncryption()"
)
return self._raw_private_bytes()
return self._backend._private_key_bytes(
encoding, format, encryption_algorithm, self, self._evp_pkey, None
)
def _raw_private_bytes(self) -> bytes:
buf = self._backend._ffi.new("unsigned char []", _ED25519_KEY_SIZE)
buflen = self._backend._ffi.new("size_t *", _ED25519_KEY_SIZE)
res = self._backend._lib.EVP_PKEY_get_raw_private_key(
self._evp_pkey, buf, buflen
)
self._backend.openssl_assert(res == 1)
self._backend.openssl_assert(buflen[0] == _ED25519_KEY_SIZE)
return self._backend._ffi.buffer(buf, _ED25519_KEY_SIZE)[:]