30b7a01dd4
This reflects some assumptions we have on our headers: - <openssl/foo.h> pulls in <openssl/base.h>. In particular, the canonical FOO typedefs for foo_st all live forward declared in <opessl/base.h>, but including <openssl/foo.h> is sufficient to use FOO. - <openssl/base.h> pulls in <stdint.h> and <stddef.h> so we don't have to keep including it. Add IWYU exports to reflect this so that clang's include cleaner gets less upset. It's a bit of a blunt instrument because it also means that <openssl/foo.h> lets you use the forward-declared BAR typedef, and downstream projects might still prefer to explicit include <stdint.h> when they use it (we use it so much that it would be too much), but I think this is fine. NB: By adding these, we're essentially promising we won't include those transitive includes because downstream code might accidentally start relying on it. Change-Id: I705fe6d1026fbd302ed0f070a0cf7658a70af8ef Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/77687 Reviewed-by: Bob Beck <bbe@google.com> Commit-Queue: David Benjamin <davidben@google.com>
92 lines
2.9 KiB
C
92 lines
2.9 KiB
C
// Copyright 2015 The BoringSSL Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef OPENSSL_HEADER_CMAC_H
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#define OPENSSL_HEADER_CMAC_H
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#include <openssl/base.h> // IWYU pragma: export
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#if defined(__cplusplus)
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extern "C" {
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#endif
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// CMAC.
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//
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// CMAC is a MAC based on AES-CBC and defined in
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// https://tools.ietf.org/html/rfc4493#section-2.3.
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// One-shot functions.
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// AES_CMAC calculates the 16-byte, CMAC authenticator of |in_len| bytes of
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// |in| and writes it to |out|. The |key_len| may be 16 or 32 bytes to select
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// between AES-128 and AES-256. It returns one on success or zero on error.
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OPENSSL_EXPORT int AES_CMAC(uint8_t out[16], const uint8_t *key, size_t key_len,
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const uint8_t *in, size_t in_len);
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// Incremental interface.
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// CMAC_CTX_new allocates a fresh |CMAC_CTX| and returns it, or NULL on
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// error.
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OPENSSL_EXPORT CMAC_CTX *CMAC_CTX_new(void);
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// CMAC_CTX_free frees a |CMAC_CTX|.
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OPENSSL_EXPORT void CMAC_CTX_free(CMAC_CTX *ctx);
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// CMAC_CTX_copy sets |out| to be a duplicate of the current state |in|. It
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// returns one on success and zero on error.
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OPENSSL_EXPORT int CMAC_CTX_copy(CMAC_CTX *out, const CMAC_CTX *in);
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// CMAC_Init configures |ctx| to use the given |key| and |cipher|. The CMAC RFC
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// only specifies the use of AES-128 thus |key_len| should be 16 and |cipher|
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// should be |EVP_aes_128_cbc()|. However, this implementation also supports
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// AES-256 by setting |key_len| to 32 and |cipher| to |EVP_aes_256_cbc()|. The
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// |engine| argument is ignored.
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//
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// It returns one on success or zero on error.
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OPENSSL_EXPORT int CMAC_Init(CMAC_CTX *ctx, const void *key, size_t key_len,
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const EVP_CIPHER *cipher, ENGINE *engine);
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// CMAC_Reset resets |ctx| so that a fresh message can be authenticated.
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OPENSSL_EXPORT int CMAC_Reset(CMAC_CTX *ctx);
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// CMAC_Update processes |in_len| bytes of message from |in|. It returns one on
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// success or zero on error.
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OPENSSL_EXPORT int CMAC_Update(CMAC_CTX *ctx, const uint8_t *in, size_t in_len);
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// CMAC_Final sets |*out_len| to 16 and, if |out| is not NULL, writes 16 bytes
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// of authenticator to it. It returns one on success or zero on error.
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OPENSSL_EXPORT int CMAC_Final(CMAC_CTX *ctx, uint8_t *out, size_t *out_len);
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#if defined(__cplusplus)
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} // extern C
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extern "C++" {
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BSSL_NAMESPACE_BEGIN
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BORINGSSL_MAKE_DELETER(CMAC_CTX, CMAC_CTX_free)
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BSSL_NAMESPACE_END
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} // extern C++
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#endif
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#endif // OPENSSL_HEADER_CMAC_H
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