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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. import typing from cryptography.exceptions import ( InvalidSignature, UnsupportedAlgorithm, _Reasons, ) from cryptography.hazmat.primitives import constant_time, hashes if typing.TYPE_CHECKING: from cryptography.hazmat.backends.openssl.backend import Backend class _HMACContext(hashes.HashContext): def __init__( self, backend: "Backend", key: bytes, algorithm: hashes.HashAlgorithm, ctx=None, ): self._algorithm = algorithm self._backend = backend if ctx is None: ctx = self._backend._lib.HMAC_CTX_new() self._backend.openssl_assert(ctx != self._backend._ffi.NULL) ctx = self._backend._ffi.gc(ctx, self._backend._lib.HMAC_CTX_free) evp_md = self._backend._evp_md_from_algorithm(algorithm) if evp_md == self._backend._ffi.NULL: raise UnsupportedAlgorithm( "{} is not a supported hash on this backend".format( algorithm.name ), _Reasons.UNSUPPORTED_HASH, ) key_ptr = self._backend._ffi.from_buffer(key) res = self._backend._lib.HMAC_Init_ex( ctx, key_ptr, len(key), evp_md, self._backend._ffi.NULL ) self._backend.openssl_assert(res != 0) self._ctx = ctx self._key = key @property def algorithm(self) -> hashes.HashAlgorithm: return self._algorithm def copy(self) -> "_HMACContext": copied_ctx = self._backend._lib.HMAC_CTX_new() self._backend.openssl_assert(copied_ctx != self._backend._ffi.NULL) copied_ctx = self._backend._ffi.gc( copied_ctx, self._backend._lib.HMAC_CTX_free ) res = self._backend._lib.HMAC_CTX_copy(copied_ctx, self._ctx) self._backend.openssl_assert(res != 0) return _HMACContext( self._backend, self._key, self.algorithm, ctx=copied_ctx ) def update(self, data: bytes) -> None: data_ptr = self._backend._ffi.from_buffer(data) res = self._backend._lib.HMAC_Update(self._ctx, data_ptr, len(data)) self._backend.openssl_assert(res != 0) def finalize(self) -> bytes: buf = self._backend._ffi.new( "unsigned char[]", self._backend._lib.EVP_MAX_MD_SIZE ) outlen = self._backend._ffi.new("unsigned int *") res = self._backend._lib.HMAC_Final(self._ctx, buf, outlen) self._backend.openssl_assert(res != 0) self._backend.openssl_assert(outlen[0] == self.algorithm.digest_size) return self._backend._ffi.buffer(buf)[: outlen[0]] def verify(self, signature: bytes) -> None: digest = self.finalize() if not constant_time.bytes_eq(digest, signature): raise InvalidSignature("Signature did not match digest.")