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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.] */
#ifndef OPENSSL_HEADER_CIPHER_INTERNAL_H
#define OPENSSL_HEADER_CIPHER_INTERNAL_H
#include <openssl/base.h>
#include <openssl/aead.h>
#include <openssl/aes.h>
#include "../../internal.h"
#include "../modes/internal.h"
#if defined(__cplusplus)
extern "C" {
#endif
// EVP_CIPH_MODE_MASK contains the bits of |flags| that represent the mode.
#define EVP_CIPH_MODE_MASK 0x3f
// EVP_AEAD represents a specific AEAD algorithm.
struct evp_aead_st {
uint8_t key_len;
uint8_t nonce_len;
uint8_t overhead;
uint8_t max_tag_len;
int seal_scatter_supports_extra_in;
// init initialises an |EVP_AEAD_CTX|. If this call returns zero then
// |cleanup| will not be called for that context.
int (*init)(EVP_AEAD_CTX *, const uint8_t *key, size_t key_len,
size_t tag_len);
int (*init_with_direction)(EVP_AEAD_CTX *, const uint8_t *key, size_t key_len,
size_t tag_len, enum evp_aead_direction_t dir);
void (*cleanup)(EVP_AEAD_CTX *);
int (*open)(const EVP_AEAD_CTX *ctx, uint8_t *out, size_t *out_len,
size_t max_out_len, const uint8_t *nonce, size_t nonce_len,
const uint8_t *in, size_t in_len, const uint8_t *ad,
size_t ad_len);
int (*seal_scatter)(const EVP_AEAD_CTX *ctx, uint8_t *out, uint8_t *out_tag,
size_t *out_tag_len, size_t max_out_tag_len,
const uint8_t *nonce, size_t nonce_len, const uint8_t *in,
size_t in_len, const uint8_t *extra_in,
size_t extra_in_len, const uint8_t *ad, size_t ad_len);
int (*open_gather)(const EVP_AEAD_CTX *ctx, uint8_t *out,
const uint8_t *nonce, size_t nonce_len, const uint8_t *in,
size_t in_len, const uint8_t *in_tag, size_t in_tag_len,
const uint8_t *ad, size_t ad_len);
int (*get_iv)(const EVP_AEAD_CTX *ctx, const uint8_t **out_iv,
size_t *out_len);
size_t (*tag_len)(const EVP_AEAD_CTX *ctx, size_t in_Len,
size_t extra_in_len);
};
struct evp_cipher_st {
// type contains a NID identifying the cipher. (e.g. NID_aes_128_gcm.)
int nid;
// block_size contains the block size, in bytes, of the cipher, or 1 for a
// stream cipher.
unsigned block_size;
// key_len contains the key size, in bytes, for the cipher. If the cipher
// takes a variable key size then this contains the default size.
unsigned key_len;
// iv_len contains the IV size, in bytes, or zero if inapplicable.
unsigned iv_len;
// ctx_size contains the size, in bytes, of the per-key context for this
// cipher.
unsigned ctx_size;
// flags contains the OR of a number of flags. See |EVP_CIPH_*|.
uint32_t flags;
// app_data is a pointer to opaque, user data.
void *app_data;
int (*init)(EVP_CIPHER_CTX *ctx, const uint8_t *key, const uint8_t *iv,
int enc);
int (*cipher)(EVP_CIPHER_CTX *ctx, uint8_t *out, const uint8_t *in,
size_t inl);
// cleanup, if non-NULL, releases memory associated with the context. It is
// called if |EVP_CTRL_INIT| succeeds. Note that |init| may not have been
// called at this point.
void (*cleanup)(EVP_CIPHER_CTX *);
int (*ctrl)(EVP_CIPHER_CTX *, int type, int arg, void *ptr);
};
// aes_ctr_set_key initialises |*aes_key| using |key_bytes| bytes from |key|,
// where |key_bytes| must either be 16, 24 or 32. If not NULL, |*out_block| is
// set to a function that encrypts single blocks. If not NULL, |*gcm_key| is
// initialised to do GHASH with the given key. It returns a function for
// optimised CTR-mode, or NULL if CTR-mode should be built using |*out_block|.
ctr128_f aes_ctr_set_key(AES_KEY *aes_key, GCM128_KEY *gcm_key,
block128_f *out_block, const uint8_t *key,
size_t key_bytes);
#if defined(__cplusplus)
} // extern C
#endif
#endif // OPENSSL_HEADER_CIPHER_INTERNAL_H
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