| /* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved. |
| |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * 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. |
| * * Neither the name of Code Aurora Forum, Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER 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. |
| */ |
| |
| #include <string.h> |
| #include <debug.h> |
| #include <sys/types.h> |
| #include "crypto_hash.h" |
| #include "crypto_eng.h" |
| |
| crypto_result_type crypto_sha256(unsigned char *buff_ptr, |
| unsigned int buff_size, |
| unsigned char *digest_ptr); |
| |
| static unsigned int sha256_init_vector[] = { 0x6A09E667, 0xBB67AE85, |
| 0x3C6EF372, 0xA54FF53A, |
| 0x510E527F, 0x9B05688C, |
| 0x1F83D9AB, 0x5BE0CD19 }; |
| |
| crypto_SHA256_ctx g_sha256_ctx; |
| |
| void hash_find(unsigned char *addr, unsigned int size, unsigned char *digest) |
| { |
| crypto_result_type ret_val = CRYPTO_SHA_ERR_NONE; |
| |
| ret_val = crypto_sha256(addr,size,digest); |
| |
| if(ret_val != CRYPTO_SHA_ERR_NONE) |
| { |
| dprintf(CRITICAL, "crypto_sha256 returns error %d\n",ret_val); |
| } |
| } |
| |
| crypto_result_type crypto_sha256_init(crypto_SHA256_ctx *ctx_ptr) |
| { |
| unsigned int i; |
| |
| if(ctx_ptr == NULL) |
| { |
| return CRYPTO_SHA_ERR_INVALID_PARAM; |
| } |
| |
| ctx_ptr->auth_bytecnt[0] = 0; |
| ctx_ptr->auth_bytecnt[1] = 0; |
| |
| memset(ctx_ptr->saved_buff, 0, CRYPTO_SHA_BLOCK_SIZE); |
| |
| for(i=0;i<SHA256_INIT_VECTOR_SIZE;i++) |
| { |
| ctx_ptr->auth_iv[i] = sha256_init_vector[i]; |
| } |
| |
| ctx_ptr->saved_buff_indx = 0; |
| |
| return CRYPTO_SHA_ERR_NONE; |
| } |
| |
| crypto_result_type crypto_sha256(unsigned char *buff_ptr, |
| unsigned int buff_size, |
| unsigned char *digest_ptr) |
| { |
| crypto_result_type ret_val = CRYPTO_SHA_ERR_NONE; |
| |
| if((!buff_size) || (buff_ptr == NULL) || (digest_ptr == NULL)) |
| { |
| return CRYPTO_SHA_ERR_INVALID_PARAM; |
| } |
| |
| crypto_init(); |
| |
| ret_val = do_sha(buff_ptr, buff_size, digest_ptr); |
| |
| if(ret_val != CRYPTO_SHA_ERR_NONE) |
| { |
| dprintf(CRITICAL, "crypto_sha256 returns error %d\n",ret_val); |
| } |
| |
| return ret_val; |
| } |
| |
| static crypto_result_type do_sha(unsigned char *buff_ptr, |
| unsigned int buff_size, |
| unsigned char *digest_ptr) |
| { |
| crypto_SHA256_ctx *ctx_ptr=NULL; |
| crypto_result_type ret_val = CRYPTO_SHA_ERR_NONE; |
| |
| crypto_sha256_init(&g_sha256_ctx); |
| ctx_ptr = &g_sha256_ctx; |
| |
| ret_val = do_sha_update(ctx_ptr, buff_ptr, buff_size, TRUE, TRUE); |
| |
| if(ret_val != CRYPTO_SHA_ERR_NONE) |
| { |
| dprintf(CRITICAL, "do_sha_update returns error %d\n",ret_val); |
| return ret_val; |
| } |
| |
| memcpy(digest_ptr, (unsigned char *)(ctx_ptr->auth_iv), 32); |
| |
| return CRYPTO_SHA_ERR_NONE; |
| } |
| |
| static crypto_result_type do_sha_update(crypto_SHA256_ctx *ctx_ptr, |
| unsigned char *buff_ptr, |
| unsigned int buff_size, |
| bool first, bool last) |
| { |
| unsigned int ret_val = CRYPTO_ERR_NONE; |
| unsigned int bytes_to_write = 0; |
| unsigned int bytes_remaining = 0; |
| unsigned int tmp_bytes = 0; |
| unsigned int bytes_written = 0; |
| unsigned int tmp_buff_size = 0; |
| unsigned char *tmp_buff_ptr = NULL; |
| unsigned char tmp_saved_buff_indx = NULL; |
| bool tmp_first; |
| bool tmp_last; |
| |
| bytes_to_write = calc_num_bytes_to_send(ctx_ptr, buff_size, last); |
| bytes_remaining = buff_size + ctx_ptr->saved_buff_indx - bytes_to_write; |
| |
| tmp_first = first; |
| tmp_saved_buff_indx = ctx_ptr->saved_buff_indx; |
| |
| do |
| { |
| if((bytes_to_write - bytes_written) > CRYPTO_MAX_AUTH_BLOCK_SIZE) |
| { |
| tmp_bytes = CRYPTO_MAX_AUTH_BLOCK_SIZE; |
| tmp_last = FALSE; |
| |
| if(ctx_ptr->saved_buff_indx != 0) |
| { |
| tmp_buff_ptr = buff_ptr; |
| tmp_buff_size = tmp_bytes - ctx_ptr->saved_buff_indx; |
| } |
| else |
| { |
| tmp_buff_ptr = buff_ptr + bytes_written - tmp_saved_buff_indx; |
| tmp_buff_size = tmp_bytes; |
| } |
| } |
| else |
| { |
| if(ctx_ptr->saved_buff_indx != 0) |
| { |
| tmp_buff_ptr = buff_ptr; |
| tmp_buff_size = bytes_to_write - bytes_written - ctx_ptr->saved_buff_indx; |
| } |
| else |
| { |
| tmp_buff_ptr = buff_ptr + bytes_written - tmp_saved_buff_indx; |
| tmp_buff_size = bytes_to_write - bytes_written - tmp_saved_buff_indx; |
| } |
| |
| tmp_bytes = (bytes_to_write - bytes_written); |
| tmp_last = last; |
| } |
| |
| crypto_set_sha_ctx(ctx_ptr, tmp_bytes, tmp_first, tmp_last); |
| |
| crypto_send_data(ctx_ptr, tmp_buff_ptr, tmp_buff_size, tmp_bytes, &ret_val); |
| |
| if(ret_val != CRYPTO_ERR_NONE) |
| { |
| return CRYPTO_SHA_ERR_FAIL; |
| } |
| |
| crypto_get_digest((unsigned char *)(ctx_ptr->auth_iv), &ret_val, tmp_last); |
| |
| if(ret_val != CRYPTO_ERR_NONE) |
| { |
| return CRYPTO_SHA_ERR_FAIL; |
| } |
| |
| if(!tmp_last) |
| { |
| crypto_get_ctx(ctx_ptr); |
| } |
| |
| bytes_written += tmp_bytes; |
| ctx_ptr->saved_buff_indx = 0; |
| |
| if(bytes_written != bytes_to_write) |
| { |
| tmp_first = FALSE; |
| } |
| |
| }while ((bytes_to_write - bytes_written) != 0); |
| |
| if(bytes_remaining) |
| { |
| memcpy(ctx_ptr->saved_buff, (buff_ptr + buff_size - bytes_remaining), |
| bytes_remaining); |
| ctx_ptr->saved_buff_indx = bytes_remaining; |
| } |
| else |
| { |
| ctx_ptr->saved_buff_indx = 0; |
| } |
| |
| return CRYPTO_SHA_ERR_NONE; |
| } |
| |
| static unsigned int calc_num_bytes_to_send(crypto_SHA256_ctx *ctx_ptr, |
| unsigned int buff_size, bool last) |
| { |
| unsigned int bytes_to_write=0; |
| |
| if(last) |
| { |
| bytes_to_write = buff_size + ctx_ptr->saved_buff_indx; |
| } |
| else |
| { |
| bytes_to_write = ((buff_size + ctx_ptr->saved_buff_indx)/ |
| CRYPTO_SHA_BLOCK_SIZE) * CRYPTO_SHA_BLOCK_SIZE; |
| } |
| return bytes_to_write; |
| } |