I added functionality to get the RSSI, BER, and Cell Neighbor for reporting connection issues to M2X
Dependencies: WncControllerK64F
mbedtls/source/cipher.c
- Committer:
- JMF
- Date:
- 2016-11-17
- Revision:
- 18:198e9b0acf11
- Parent:
- 12:0071cb144c7a
File content as of revision 18:198e9b0acf11:
/** * \file cipher.c * * \brief Generic cipher wrapper for mbed TLS * * \author Adriaan de Jong <dejong@fox-it.com> * * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved * SPDX-License-Identifier: Apache-2.0 * * Licensed under the Apache License, Version 2.0 (the "License"); you may * not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * * This file is part of mbed TLS (https://tls.mbed.org) */ #if !defined(MBEDTLS_CONFIG_FILE) #include "mbedtls/config.h" #else #include MBEDTLS_CONFIG_FILE #endif #if defined(MBEDTLS_CIPHER_C) #include "mbedtls/cipher.h" #include "mbedtls/cipher_internal.h" #include <stdlib.h> #include <string.h> #if defined(MBEDTLS_GCM_C) #include "mbedtls/gcm.h" #endif #if defined(MBEDTLS_CCM_C) #include "mbedtls/ccm.h" #endif #if defined(MBEDTLS_ARC4_C) || defined(MBEDTLS_CIPHER_NULL_CIPHER) #define MBEDTLS_CIPHER_MODE_STREAM #endif /* Implementation that should never be optimized out by the compiler */ static void mbedtls_zeroize( void *v, size_t n ) { volatile unsigned char *p = (unsigned char*)v; while( n-- ) *p++ = 0; } static int supported_init = 0; const int *mbedtls_cipher_list( void ) { const mbedtls_cipher_definition_t *def; int *type; if( ! supported_init ) { def = mbedtls_cipher_definitions; type = mbedtls_cipher_supported; while( def->type != 0 ) *type++ = (*def++).type; *type = 0; supported_init = 1; } return( mbedtls_cipher_supported ); } const mbedtls_cipher_info_t *mbedtls_cipher_info_from_type( const mbedtls_cipher_type_t cipher_type ) { const mbedtls_cipher_definition_t *def; for( def = mbedtls_cipher_definitions; def->info != NULL; def++ ) if( def->type == cipher_type ) return( def->info ); return( NULL ); } const mbedtls_cipher_info_t *mbedtls_cipher_info_from_string( const char *cipher_name ) { const mbedtls_cipher_definition_t *def; if( NULL == cipher_name ) return( NULL ); for( def = mbedtls_cipher_definitions; def->info != NULL; def++ ) if( ! strcmp( def->info->name, cipher_name ) ) return( def->info ); return( NULL ); } const mbedtls_cipher_info_t *mbedtls_cipher_info_from_values( const mbedtls_cipher_id_t cipher_id, int key_bitlen, const mbedtls_cipher_mode_t mode ) { const mbedtls_cipher_definition_t *def; for( def = mbedtls_cipher_definitions; def->info != NULL; def++ ) if( def->info->base->cipher == cipher_id && def->info->key_bitlen == (unsigned) key_bitlen && def->info->mode == mode ) return( def->info ); return( NULL ); } void mbedtls_cipher_init( mbedtls_cipher_context_t *ctx ) { memset( ctx, 0, sizeof( mbedtls_cipher_context_t ) ); } void mbedtls_cipher_free( mbedtls_cipher_context_t *ctx ) { if( ctx == NULL ) return; if( ctx->cipher_ctx ) ctx->cipher_info->base->ctx_free_func( ctx->cipher_ctx ); mbedtls_zeroize( ctx, sizeof(mbedtls_cipher_context_t) ); } int mbedtls_cipher_setup( mbedtls_cipher_context_t *ctx, const mbedtls_cipher_info_t *cipher_info ) { if( NULL == cipher_info || NULL == ctx ) return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); memset( ctx, 0, sizeof( mbedtls_cipher_context_t ) ); if( NULL == ( ctx->cipher_ctx = cipher_info->base->ctx_alloc_func() ) ) return( MBEDTLS_ERR_CIPHER_ALLOC_FAILED ); ctx->cipher_info = cipher_info; #if defined(MBEDTLS_CIPHER_MODE_WITH_PADDING) /* * Ignore possible errors caused by a cipher mode that doesn't use padding */ #if defined(MBEDTLS_CIPHER_PADDING_PKCS7) (void) mbedtls_cipher_set_padding_mode( ctx, MBEDTLS_PADDING_PKCS7 ); #else (void) mbedtls_cipher_set_padding_mode( ctx, MBEDTLS_PADDING_NONE ); #endif #endif /* MBEDTLS_CIPHER_MODE_WITH_PADDING */ return( 0 ); } int mbedtls_cipher_setkey( mbedtls_cipher_context_t *ctx, const unsigned char *key, int key_bitlen, const mbedtls_operation_t operation ) { if( NULL == ctx || NULL == ctx->cipher_info ) return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); if( ( ctx->cipher_info->flags & MBEDTLS_CIPHER_VARIABLE_KEY_LEN ) == 0 && (int) ctx->cipher_info->key_bitlen != key_bitlen ) { return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); } ctx->key_bitlen = key_bitlen; ctx->operation = operation; /* * For CFB and CTR mode always use the encryption key schedule */ if( MBEDTLS_ENCRYPT == operation || MBEDTLS_MODE_CFB == ctx->cipher_info->mode || MBEDTLS_MODE_CTR == ctx->cipher_info->mode ) { return ctx->cipher_info->base->setkey_enc_func( ctx->cipher_ctx, key, ctx->key_bitlen ); } if( MBEDTLS_DECRYPT == operation ) return ctx->cipher_info->base->setkey_dec_func( ctx->cipher_ctx, key, ctx->key_bitlen ); return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); } int mbedtls_cipher_set_iv( mbedtls_cipher_context_t *ctx, const unsigned char *iv, size_t iv_len ) { size_t actual_iv_size; if( NULL == ctx || NULL == ctx->cipher_info || NULL == iv ) return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); /* avoid buffer overflow in ctx->iv */ if( iv_len > MBEDTLS_MAX_IV_LENGTH ) return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE ); if( ( ctx->cipher_info->flags & MBEDTLS_CIPHER_VARIABLE_IV_LEN ) != 0 ) actual_iv_size = iv_len; else { actual_iv_size = ctx->cipher_info->iv_size; /* avoid reading past the end of input buffer */ if( actual_iv_size > iv_len ) return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); } memcpy( ctx->iv, iv, actual_iv_size ); ctx->iv_size = actual_iv_size; return( 0 ); } int mbedtls_cipher_reset( mbedtls_cipher_context_t *ctx ) { if( NULL == ctx || NULL == ctx->cipher_info ) return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); ctx->unprocessed_len = 0; return( 0 ); } #if defined(MBEDTLS_GCM_C) int mbedtls_cipher_update_ad( mbedtls_cipher_context_t *ctx, const unsigned char *ad, size_t ad_len ) { if( NULL == ctx || NULL == ctx->cipher_info ) return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); if( MBEDTLS_MODE_GCM == ctx->cipher_info->mode ) { return mbedtls_gcm_starts( (mbedtls_gcm_context *) ctx->cipher_ctx, ctx->operation, ctx->iv, ctx->iv_size, ad, ad_len ); } return( 0 ); } #endif /* MBEDTLS_GCM_C */ int mbedtls_cipher_update( mbedtls_cipher_context_t *ctx, const unsigned char *input, size_t ilen, unsigned char *output, size_t *olen ) { int ret; size_t block_size = 0; if( NULL == ctx || NULL == ctx->cipher_info || NULL == olen ) { return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); } *olen = 0; block_size = mbedtls_cipher_get_block_size( ctx ); if( ctx->cipher_info->mode == MBEDTLS_MODE_ECB ) { if( ilen != block_size ) return( MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED ); *olen = ilen; if( 0 != ( ret = ctx->cipher_info->base->ecb_func( ctx->cipher_ctx, ctx->operation, input, output ) ) ) { return( ret ); } return( 0 ); } #if defined(MBEDTLS_GCM_C) if( ctx->cipher_info->mode == MBEDTLS_MODE_GCM ) { *olen = ilen; return mbedtls_gcm_update( (mbedtls_gcm_context *) ctx->cipher_ctx, ilen, input, output ); } #endif if ( 0 == block_size ) { return MBEDTLS_ERR_CIPHER_INVALID_CONTEXT; } if( input == output && ( ctx->unprocessed_len != 0 || ilen % block_size ) ) { return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); } #if defined(MBEDTLS_CIPHER_MODE_CBC) if( ctx->cipher_info->mode == MBEDTLS_MODE_CBC ) { size_t copy_len = 0; /* * If there is not enough data for a full block, cache it. */ if( ( ctx->operation == MBEDTLS_DECRYPT && ilen + ctx->unprocessed_len <= block_size ) || ( ctx->operation == MBEDTLS_ENCRYPT && ilen + ctx->unprocessed_len < block_size ) ) { memcpy( &( ctx->unprocessed_data[ctx->unprocessed_len] ), input, ilen ); ctx->unprocessed_len += ilen; return( 0 ); } /* * Process cached data first */ if( 0 != ctx->unprocessed_len ) { copy_len = block_size - ctx->unprocessed_len; memcpy( &( ctx->unprocessed_data[ctx->unprocessed_len] ), input, copy_len ); if( 0 != ( ret = ctx->cipher_info->base->cbc_func( ctx->cipher_ctx, ctx->operation, block_size, ctx->iv, ctx->unprocessed_data, output ) ) ) { return( ret ); } *olen += block_size; output += block_size; ctx->unprocessed_len = 0; input += copy_len; ilen -= copy_len; } /* * Cache final, incomplete block */ if( 0 != ilen ) { if( 0 == block_size ) { return MBEDTLS_ERR_CIPHER_INVALID_CONTEXT; } copy_len = ilen % block_size; if( copy_len == 0 && ctx->operation == MBEDTLS_DECRYPT ) copy_len = block_size; memcpy( ctx->unprocessed_data, &( input[ilen - copy_len] ), copy_len ); ctx->unprocessed_len += copy_len; ilen -= copy_len; } /* * Process remaining full blocks */ if( ilen ) { if( 0 != ( ret = ctx->cipher_info->base->cbc_func( ctx->cipher_ctx, ctx->operation, ilen, ctx->iv, input, output ) ) ) { return( ret ); } *olen += ilen; } return( 0 ); } #endif /* MBEDTLS_CIPHER_MODE_CBC */ #if defined(MBEDTLS_CIPHER_MODE_CFB) if( ctx->cipher_info->mode == MBEDTLS_MODE_CFB ) { if( 0 != ( ret = ctx->cipher_info->base->cfb_func( ctx->cipher_ctx, ctx->operation, ilen, &ctx->unprocessed_len, ctx->iv, input, output ) ) ) { return( ret ); } *olen = ilen; return( 0 ); } #endif /* MBEDTLS_CIPHER_MODE_CFB */ #if defined(MBEDTLS_CIPHER_MODE_CTR) if( ctx->cipher_info->mode == MBEDTLS_MODE_CTR ) { if( 0 != ( ret = ctx->cipher_info->base->ctr_func( ctx->cipher_ctx, ilen, &ctx->unprocessed_len, ctx->iv, ctx->unprocessed_data, input, output ) ) ) { return( ret ); } *olen = ilen; return( 0 ); } #endif /* MBEDTLS_CIPHER_MODE_CTR */ #if defined(MBEDTLS_CIPHER_MODE_STREAM) if( ctx->cipher_info->mode == MBEDTLS_MODE_STREAM ) { if( 0 != ( ret = ctx->cipher_info->base->stream_func( ctx->cipher_ctx, ilen, input, output ) ) ) { return( ret ); } *olen = ilen; return( 0 ); } #endif /* MBEDTLS_CIPHER_MODE_STREAM */ return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE ); } #if defined(MBEDTLS_CIPHER_MODE_WITH_PADDING) #if defined(MBEDTLS_CIPHER_PADDING_PKCS7) /* * PKCS7 (and PKCS5) padding: fill with ll bytes, with ll = padding_len */ static void add_pkcs_padding( unsigned char *output, size_t output_len, size_t data_len ) { size_t padding_len = output_len - data_len; unsigned char i; for( i = 0; i < padding_len; i++ ) output[data_len + i] = (unsigned char) padding_len; } static int get_pkcs_padding( unsigned char *input, size_t input_len, size_t *data_len ) { size_t i, pad_idx; unsigned char padding_len, bad = 0; if( NULL == input || NULL == data_len ) return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); padding_len = input[input_len - 1]; *data_len = input_len - padding_len; /* Avoid logical || since it results in a branch */ bad |= padding_len > input_len; bad |= padding_len == 0; /* The number of bytes checked must be independent of padding_len, * so pick input_len, which is usually 8 or 16 (one block) */ pad_idx = input_len - padding_len; for( i = 0; i < input_len; i++ ) bad |= ( input[i] ^ padding_len ) * ( i >= pad_idx ); return( MBEDTLS_ERR_CIPHER_INVALID_PADDING * ( bad != 0 ) ); } #endif /* MBEDTLS_CIPHER_PADDING_PKCS7 */ #if defined(MBEDTLS_CIPHER_PADDING_ONE_AND_ZEROS) /* * One and zeros padding: fill with 80 00 ... 00 */ static void add_one_and_zeros_padding( unsigned char *output, size_t output_len, size_t data_len ) { size_t padding_len = output_len - data_len; unsigned char i = 0; output[data_len] = 0x80; for( i = 1; i < padding_len; i++ ) output[data_len + i] = 0x00; } static int get_one_and_zeros_padding( unsigned char *input, size_t input_len, size_t *data_len ) { size_t i; unsigned char done = 0, prev_done, bad; if( NULL == input || NULL == data_len ) return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); bad = 0xFF; *data_len = 0; for( i = input_len; i > 0; i-- ) { prev_done = done; done |= ( input[i-1] != 0 ); *data_len |= ( i - 1 ) * ( done != prev_done ); bad &= ( input[i-1] ^ 0x80 ) | ( done == prev_done ); } return( MBEDTLS_ERR_CIPHER_INVALID_PADDING * ( bad != 0 ) ); } #endif /* MBEDTLS_CIPHER_PADDING_ONE_AND_ZEROS */ #if defined(MBEDTLS_CIPHER_PADDING_ZEROS_AND_LEN) /* * Zeros and len padding: fill with 00 ... 00 ll, where ll is padding length */ static void add_zeros_and_len_padding( unsigned char *output, size_t output_len, size_t data_len ) { size_t padding_len = output_len - data_len; unsigned char i = 0; for( i = 1; i < padding_len; i++ ) output[data_len + i - 1] = 0x00; output[output_len - 1] = (unsigned char) padding_len; } static int get_zeros_and_len_padding( unsigned char *input, size_t input_len, size_t *data_len ) { size_t i, pad_idx; unsigned char padding_len, bad = 0; if( NULL == input || NULL == data_len ) return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); padding_len = input[input_len - 1]; *data_len = input_len - padding_len; /* Avoid logical || since it results in a branch */ bad |= padding_len > input_len; bad |= padding_len == 0; /* The number of bytes checked must be independent of padding_len */ pad_idx = input_len - padding_len; for( i = 0; i < input_len - 1; i++ ) bad |= input[i] * ( i >= pad_idx ); return( MBEDTLS_ERR_CIPHER_INVALID_PADDING * ( bad != 0 ) ); } #endif /* MBEDTLS_CIPHER_PADDING_ZEROS_AND_LEN */ #if defined(MBEDTLS_CIPHER_PADDING_ZEROS) /* * Zero padding: fill with 00 ... 00 */ static void add_zeros_padding( unsigned char *output, size_t output_len, size_t data_len ) { size_t i; for( i = data_len; i < output_len; i++ ) output[i] = 0x00; } static int get_zeros_padding( unsigned char *input, size_t input_len, size_t *data_len ) { size_t i; unsigned char done = 0, prev_done; if( NULL == input || NULL == data_len ) return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); *data_len = 0; for( i = input_len; i > 0; i-- ) { prev_done = done; done |= ( input[i-1] != 0 ); *data_len |= i * ( done != prev_done ); } return( 0 ); } #endif /* MBEDTLS_CIPHER_PADDING_ZEROS */ /* * No padding: don't pad :) * * There is no add_padding function (check for NULL in mbedtls_cipher_finish) * but a trivial get_padding function */ static int get_no_padding( unsigned char *input, size_t input_len, size_t *data_len ) { if( NULL == input || NULL == data_len ) return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); *data_len = input_len; return( 0 ); } #endif /* MBEDTLS_CIPHER_MODE_WITH_PADDING */ int mbedtls_cipher_finish( mbedtls_cipher_context_t *ctx, unsigned char *output, size_t *olen ) { if( NULL == ctx || NULL == ctx->cipher_info || NULL == olen ) return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); *olen = 0; if( MBEDTLS_MODE_CFB == ctx->cipher_info->mode || MBEDTLS_MODE_CTR == ctx->cipher_info->mode || MBEDTLS_MODE_GCM == ctx->cipher_info->mode || MBEDTLS_MODE_STREAM == ctx->cipher_info->mode ) { return( 0 ); } if( MBEDTLS_MODE_ECB == ctx->cipher_info->mode ) { if( ctx->unprocessed_len != 0 ) return( MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED ); return( 0 ); } #if defined(MBEDTLS_CIPHER_MODE_CBC) if( MBEDTLS_MODE_CBC == ctx->cipher_info->mode ) { int ret = 0; if( MBEDTLS_ENCRYPT == ctx->operation ) { /* check for 'no padding' mode */ if( NULL == ctx->add_padding ) { if( 0 != ctx->unprocessed_len ) return( MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED ); return( 0 ); } ctx->add_padding( ctx->unprocessed_data, mbedtls_cipher_get_iv_size( ctx ), ctx->unprocessed_len ); } else if( mbedtls_cipher_get_block_size( ctx ) != ctx->unprocessed_len ) { /* * For decrypt operations, expect a full block, * or an empty block if no padding */ if( NULL == ctx->add_padding && 0 == ctx->unprocessed_len ) return( 0 ); return( MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED ); } /* cipher block */ if( 0 != ( ret = ctx->cipher_info->base->cbc_func( ctx->cipher_ctx, ctx->operation, mbedtls_cipher_get_block_size( ctx ), ctx->iv, ctx->unprocessed_data, output ) ) ) { return( ret ); } /* Set output size for decryption */ if( MBEDTLS_DECRYPT == ctx->operation ) return ctx->get_padding( output, mbedtls_cipher_get_block_size( ctx ), olen ); /* Set output size for encryption */ *olen = mbedtls_cipher_get_block_size( ctx ); return( 0 ); } #else ((void) output); #endif /* MBEDTLS_CIPHER_MODE_CBC */ return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE ); } #if defined(MBEDTLS_CIPHER_MODE_WITH_PADDING) int mbedtls_cipher_set_padding_mode( mbedtls_cipher_context_t *ctx, mbedtls_cipher_padding_t mode ) { if( NULL == ctx || MBEDTLS_MODE_CBC != ctx->cipher_info->mode ) { return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); } switch( mode ) { #if defined(MBEDTLS_CIPHER_PADDING_PKCS7) case MBEDTLS_PADDING_PKCS7: ctx->add_padding = add_pkcs_padding; ctx->get_padding = get_pkcs_padding; break; #endif #if defined(MBEDTLS_CIPHER_PADDING_ONE_AND_ZEROS) case MBEDTLS_PADDING_ONE_AND_ZEROS: ctx->add_padding = add_one_and_zeros_padding; ctx->get_padding = get_one_and_zeros_padding; break; #endif #if defined(MBEDTLS_CIPHER_PADDING_ZEROS_AND_LEN) case MBEDTLS_PADDING_ZEROS_AND_LEN: ctx->add_padding = add_zeros_and_len_padding; ctx->get_padding = get_zeros_and_len_padding; break; #endif #if defined(MBEDTLS_CIPHER_PADDING_ZEROS) case MBEDTLS_PADDING_ZEROS: ctx->add_padding = add_zeros_padding; ctx->get_padding = get_zeros_padding; break; #endif case MBEDTLS_PADDING_NONE: ctx->add_padding = NULL; ctx->get_padding = get_no_padding; break; default: return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE ); } return( 0 ); } #endif /* MBEDTLS_CIPHER_MODE_WITH_PADDING */ #if defined(MBEDTLS_GCM_C) int mbedtls_cipher_write_tag( mbedtls_cipher_context_t *ctx, unsigned char *tag, size_t tag_len ) { if( NULL == ctx || NULL == ctx->cipher_info || NULL == tag ) return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); if( MBEDTLS_ENCRYPT != ctx->operation ) return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); if( MBEDTLS_MODE_GCM == ctx->cipher_info->mode ) return mbedtls_gcm_finish( (mbedtls_gcm_context *) ctx->cipher_ctx, tag, tag_len ); return( 0 ); } int mbedtls_cipher_check_tag( mbedtls_cipher_context_t *ctx, const unsigned char *tag, size_t tag_len ) { int ret; if( NULL == ctx || NULL == ctx->cipher_info || MBEDTLS_DECRYPT != ctx->operation ) { return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); } if( MBEDTLS_MODE_GCM == ctx->cipher_info->mode ) { unsigned char check_tag[16]; size_t i; int diff; if( tag_len > sizeof( check_tag ) ) return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); if( 0 != ( ret = mbedtls_gcm_finish( (mbedtls_gcm_context *) ctx->cipher_ctx, check_tag, tag_len ) ) ) { return( ret ); } /* Check the tag in "constant-time" */ for( diff = 0, i = 0; i < tag_len; i++ ) diff |= tag[i] ^ check_tag[i]; if( diff != 0 ) return( MBEDTLS_ERR_CIPHER_AUTH_FAILED ); return( 0 ); } return( 0 ); } #endif /* MBEDTLS_GCM_C */ /* * Packet-oriented wrapper for non-AEAD modes */ int mbedtls_cipher_crypt( mbedtls_cipher_context_t *ctx, const unsigned char *iv, size_t iv_len, const unsigned char *input, size_t ilen, unsigned char *output, size_t *olen ) { int ret; size_t finish_olen; if( ( ret = mbedtls_cipher_set_iv( ctx, iv, iv_len ) ) != 0 ) return( ret ); if( ( ret = mbedtls_cipher_reset( ctx ) ) != 0 ) return( ret ); if( ( ret = mbedtls_cipher_update( ctx, input, ilen, output, olen ) ) != 0 ) return( ret ); if( ( ret = mbedtls_cipher_finish( ctx, output + *olen, &finish_olen ) ) != 0 ) return( ret ); *olen += finish_olen; return( 0 ); } #if defined(MBEDTLS_CIPHER_MODE_AEAD) /* * Packet-oriented encryption for AEAD modes */ int mbedtls_cipher_auth_encrypt( mbedtls_cipher_context_t *ctx, const unsigned char *iv, size_t iv_len, const unsigned char *ad, size_t ad_len, const unsigned char *input, size_t ilen, unsigned char *output, size_t *olen, unsigned char *tag, size_t tag_len ) { #if defined(MBEDTLS_GCM_C) if( MBEDTLS_MODE_GCM == ctx->cipher_info->mode ) { *olen = ilen; return( mbedtls_gcm_crypt_and_tag( ctx->cipher_ctx, MBEDTLS_GCM_ENCRYPT, ilen, iv, iv_len, ad, ad_len, input, output, tag_len, tag ) ); } #endif /* MBEDTLS_GCM_C */ #if defined(MBEDTLS_CCM_C) if( MBEDTLS_MODE_CCM == ctx->cipher_info->mode ) { *olen = ilen; return( mbedtls_ccm_encrypt_and_tag( ctx->cipher_ctx, ilen, iv, iv_len, ad, ad_len, input, output, tag, tag_len ) ); } #endif /* MBEDTLS_CCM_C */ return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE ); } /* * Packet-oriented decryption for AEAD modes */ int mbedtls_cipher_auth_decrypt( mbedtls_cipher_context_t *ctx, const unsigned char *iv, size_t iv_len, const unsigned char *ad, size_t ad_len, const unsigned char *input, size_t ilen, unsigned char *output, size_t *olen, const unsigned char *tag, size_t tag_len ) { #if defined(MBEDTLS_GCM_C) if( MBEDTLS_MODE_GCM == ctx->cipher_info->mode ) { int ret; *olen = ilen; ret = mbedtls_gcm_auth_decrypt( ctx->cipher_ctx, ilen, iv, iv_len, ad, ad_len, tag, tag_len, input, output ); if( ret == MBEDTLS_ERR_GCM_AUTH_FAILED ) ret = MBEDTLS_ERR_CIPHER_AUTH_FAILED; return( ret ); } #endif /* MBEDTLS_GCM_C */ #if defined(MBEDTLS_CCM_C) if( MBEDTLS_MODE_CCM == ctx->cipher_info->mode ) { int ret; *olen = ilen; ret = mbedtls_ccm_auth_decrypt( ctx->cipher_ctx, ilen, iv, iv_len, ad, ad_len, input, output, tag, tag_len ); if( ret == MBEDTLS_ERR_CCM_AUTH_FAILED ) ret = MBEDTLS_ERR_CIPHER_AUTH_FAILED; return( ret ); } #endif /* MBEDTLS_CCM_C */ return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE ); } #endif /* MBEDTLS_CIPHER_MODE_AEAD */ #endif /* MBEDTLS_CIPHER_C */