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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.ed448 import ( Ed448PrivateKey, Ed448PublicKey, ) _ED448_KEY_SIZE = 57 _ED448_SIG_SIZE = 114 class _Ed448PublicKey(Ed448PublicKey): 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 []", _ED448_KEY_SIZE) buflen = self._backend._ffi.new("size_t *", _ED448_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] == _ED448_KEY_SIZE) return self._backend._ffi.buffer(buf, _ED448_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 _Ed448PrivateKey(Ed448PrivateKey): def __init__(self, backend, evp_pkey): self._backend = backend self._evp_pkey = evp_pkey def public_key(self) -> Ed448PublicKey: buf = self._backend._ffi.new("unsigned char []", _ED448_KEY_SIZE) buflen = self._backend._ffi.new("size_t *", _ED448_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] == _ED448_KEY_SIZE) public_bytes = self._backend._ffi.buffer(buf)[:] return self._backend.ed448_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[]", _ED448_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] == _ED448_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 []", _ED448_KEY_SIZE) buflen = self._backend._ffi.new("size_t *", _ED448_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] == _ED448_KEY_SIZE) return self._backend._ffi.buffer(buf, _ED448_KEY_SIZE)[:]