148 lines
6.2 KiB
C
148 lines
6.2 KiB
C
/* ====================================================================
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* Copyright (c) 2008 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@openssl.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ==================================================================== */
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#ifndef __CROS_EC_AES_GCM_H
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#define __CROS_EC_AES_GCM_H
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#include "common.h"
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#include "endian.h"
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#include "util.h"
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// block128_f is the type of a 128-bit, block cipher.
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typedef void (*block128_f)(const uint8_t in[16], uint8_t out[16],
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const void *key);
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// GCM definitions
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typedef struct { uint64_t hi,lo; } u128;
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// gmult_func multiplies |Xi| by the GCM key and writes the result back to
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// |Xi|.
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typedef void (*gmult_func)(uint64_t Xi[2], const u128 Htable[16]);
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// ghash_func repeatedly multiplies |Xi| by the GCM key and adds in blocks from
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// |inp|. The result is written back to |Xi| and the |len| argument must be a
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// multiple of 16.
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typedef void (*ghash_func)(uint64_t Xi[2], const u128 Htable[16],
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const uint8_t *inp, size_t len);
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// This differs from upstream's |gcm128_context| in that it does not have the
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// |key| pointer, in order to make it |memcpy|-friendly. Rather the key is
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// passed into each call that needs it.
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struct gcm128_context {
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// Following 6 names follow names in GCM specification
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union {
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uint64_t u[2];
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uint32_t d[4];
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uint8_t c[16];
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size_t t[16 / sizeof(size_t)];
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} Yi, EKi, EK0, len, Xi;
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// Note that the order of |Xi|, |H| and |Htable| is fixed by the MOVBE-based,
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// x86-64, GHASH assembly.
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u128 H;
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u128 Htable[16];
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gmult_func gmult;
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ghash_func ghash;
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unsigned int mres, ares;
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block128_f block;
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};
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// GCM.
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//
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// This API differs from the upstream API slightly. The |GCM128_CONTEXT| does
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// not have a |key| pointer that points to the key as upstream's version does.
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// Instead, every function takes a |key| parameter. This way |GCM128_CONTEXT|
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// can be safely copied.
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typedef struct gcm128_context GCM128_CONTEXT;
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// CRYPTO_gcm128_init initialises |ctx| to use |block| (typically AES) with
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// the given key. |block_is_hwaes| is one if |block| is |aes_hw_encrypt|.
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void CRYPTO_gcm128_init(GCM128_CONTEXT *ctx, const void *key,
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block128_f block, int block_is_hwaes);
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// CRYPTO_gcm128_setiv sets the IV (nonce) for |ctx|. The |key| must be the
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// same key that was passed to |CRYPTO_gcm128_init|.
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void CRYPTO_gcm128_setiv(GCM128_CONTEXT *ctx, const void *key,
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const uint8_t *iv, size_t iv_len);
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// CRYPTO_gcm128_aad sets the authenticated data for an instance of GCM.
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// This must be called before and data is encrypted. It returns one on success
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// and zero otherwise.
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int CRYPTO_gcm128_aad(GCM128_CONTEXT *ctx, const uint8_t *aad,
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size_t len);
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// CRYPTO_gcm128_encrypt encrypts |len| bytes from |in| to |out|. The |key|
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// must be the same key that was passed to |CRYPTO_gcm128_init|. It returns one
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// on success and zero otherwise.
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int CRYPTO_gcm128_encrypt(GCM128_CONTEXT *ctx, const void *key,
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const uint8_t *in, uint8_t *out,
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size_t len);
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// CRYPTO_gcm128_decrypt decrypts |len| bytes from |in| to |out|. The |key|
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// must be the same key that was passed to |CRYPTO_gcm128_init|. It returns one
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// on success and zero otherwise.
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int CRYPTO_gcm128_decrypt(GCM128_CONTEXT *ctx, const void *key,
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const uint8_t *in, uint8_t *out,
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size_t len);
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// CRYPTO_gcm128_finish calculates the authenticator and compares it against
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// |len| bytes of |tag|. It returns one on success and zero otherwise.
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int CRYPTO_gcm128_finish(GCM128_CONTEXT *ctx, const uint8_t *tag,
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size_t len);
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// CRYPTO_gcm128_tag calculates the authenticator and copies it into |tag|.
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// The minimum of |len| and 16 bytes are copied into |tag|.
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void CRYPTO_gcm128_tag(GCM128_CONTEXT *ctx, uint8_t *tag,
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size_t len);
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#endif // __CROS_EC_AES_GCM_H
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