216 lines
5.6 KiB
C
216 lines
5.6 KiB
C
/*
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* ---------------------------------------------------------------------------
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* OpenAES License
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* ---------------------------------------------------------------------------
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* Copyright (c) 2012, Nabil S. Al Ramli, www.nalramli.com
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* 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 are met:
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*
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, 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 OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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* ---------------------------------------------------------------------------
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*/
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#ifndef _OAES_LIB_H
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#define _OAES_LIB_H
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#include <stdint.h>
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#include <stdlib.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifdef _WIN32
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# ifdef OAES_SHARED
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# ifdef oaes_lib_EXPORTS
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# define OAES_API __declspec(dllexport)
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# else
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# define OAES_API __declspec(dllimport)
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# endif
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# else
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# define OAES_API
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# endif
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#else
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# define OAES_API
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#endif // WIN32
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#define OAES_VERSION "0.8.1"
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#define OAES_BLOCK_SIZE 16
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typedef void OAES_CTX;
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typedef enum
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{
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OAES_RET_FIRST = 0,
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OAES_RET_SUCCESS = 0,
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OAES_RET_UNKNOWN,
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OAES_RET_ARG1,
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OAES_RET_ARG2,
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OAES_RET_ARG3,
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OAES_RET_ARG4,
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OAES_RET_ARG5,
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OAES_RET_NOKEY,
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OAES_RET_MEM,
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OAES_RET_BUF,
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OAES_RET_HEADER,
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OAES_RET_COUNT
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} OAES_RET;
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/*
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* oaes_set_option() takes one of these values for its [option] parameter
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* some options accept either an optional or a required [value] parameter
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*/
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// no option
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#define OAES_OPTION_NONE 0
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// enable ECB mode, disable CBC mode
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#define OAES_OPTION_ECB 1
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// enable CBC mode, disable ECB mode
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// value is optional, may pass uint8_t iv[OAES_BLOCK_SIZE] to specify
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// the value of the initialization vector, iv
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#define OAES_OPTION_CBC 2
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#ifdef OAES_DEBUG
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typedef int ( * oaes_step_cb ) (
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const uint8_t state[OAES_BLOCK_SIZE],
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const char * step_name,
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int step_count,
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void * user_data );
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// enable state stepping mode
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// value is required, must pass oaes_step_cb to receive the state at each step
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#define OAES_OPTION_STEP_ON 4
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// disable state stepping mode
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#define OAES_OPTION_STEP_OFF 8
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#endif // OAES_DEBUG
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typedef uint16_t OAES_OPTION;
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typedef struct _oaes_key
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{
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size_t data_len;
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uint8_t *data;
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size_t exp_data_len;
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uint8_t *exp_data;
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size_t num_keys;
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size_t key_base;
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} oaes_key;
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typedef struct _oaes_ctx
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{
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#ifdef OAES_HAVE_ISAAC
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randctx * rctx;
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#endif // OAES_HAVE_ISAAC
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#ifdef OAES_DEBUG
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oaes_step_cb step_cb;
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#endif // OAES_DEBUG
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oaes_key * key;
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OAES_OPTION options;
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uint8_t iv[OAES_BLOCK_SIZE];
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} oaes_ctx;
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/*
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* // usage:
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*
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* OAES_CTX * ctx = oaes_alloc();
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* .
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* .
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* .
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* {
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* oaes_gen_key_xxx( ctx );
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* {
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* oaes_key_export( ctx, _buf, &_buf_len );
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* // or
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* oaes_key_export_data( ctx, _buf, &_buf_len );\
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* }
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* }
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* // or
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* {
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* oaes_key_import( ctx, _buf, _buf_len );
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* // or
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* oaes_key_import_data( ctx, _buf, _buf_len );
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* }
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* .
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* .
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* .
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* oaes_encrypt( ctx, m, m_len, c, &c_len );
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* .
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* .
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* .
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* oaes_decrypt( ctx, c, c_len, m, &m_len );
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* .
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* .
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* .
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* oaes_free( &ctx );
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*/
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OAES_API OAES_CTX * oaes_alloc(void);
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OAES_API OAES_RET oaes_free( OAES_CTX ** ctx );
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OAES_API OAES_RET oaes_set_option( OAES_CTX * ctx,
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OAES_OPTION option, const void * value );
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OAES_API OAES_RET oaes_key_gen_128( OAES_CTX * ctx );
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OAES_API OAES_RET oaes_key_gen_192( OAES_CTX * ctx );
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OAES_API OAES_RET oaes_key_gen_256( OAES_CTX * ctx );
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// export key with header information
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// set data == NULL to get the required data_len
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OAES_API OAES_RET oaes_key_export( OAES_CTX * ctx,
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uint8_t * data, size_t * data_len );
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// directly export the data from key
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// set data == NULL to get the required data_len
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OAES_API OAES_RET oaes_key_export_data( OAES_CTX * ctx,
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uint8_t * data, size_t * data_len );
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// import key with header information
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OAES_API OAES_RET oaes_key_import( OAES_CTX * ctx,
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const uint8_t * data, size_t data_len );
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// directly import data into key
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OAES_API OAES_RET oaes_key_import_data( OAES_CTX * ctx,
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const uint8_t * data, size_t data_len );
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// set c == NULL to get the required c_len
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OAES_API OAES_RET oaes_encrypt( OAES_CTX * ctx,
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const uint8_t * m, size_t m_len, uint8_t * c, size_t * c_len );
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// set m == NULL to get the required m_len
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OAES_API OAES_RET oaes_decrypt( OAES_CTX * ctx,
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const uint8_t * c, size_t c_len, uint8_t * m, size_t * m_len );
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// set buf == NULL to get the required buf_len
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OAES_API OAES_RET oaes_sprintf(
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char * buf, size_t * buf_len, const uint8_t * data, size_t data_len );
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OAES_API OAES_RET oaes_encryption_round( const uint8_t * key, uint8_t * c );
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OAES_API OAES_RET oaes_pseudo_encrypt_ecb( OAES_CTX * ctx, uint8_t * c );
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#ifdef __cplusplus
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}
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#endif
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#endif // _OAES_LIB_H
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