mirror of
https://github.com/libretro/RetroArch
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760 lines
21 KiB
C
760 lines
21 KiB
C
/*
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* FIPS-197 compliant AES implementation
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*
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* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* This file is part of mbed TLS (https://tls.mbed.org)
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*/
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/*
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* The AES block cipher was designed by Vincent Rijmen and Joan Daemen.
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*
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* http://csrc.nist.gov/encryption/aes/rijndael/Rijndael.pdf
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* http://csrc.nist.gov/publications/fips/fips197/fips-197.pdf
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*/
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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "mbedtls/config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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#if defined(MBEDTLS_AES_C)
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#include <string.h>
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#include "mbedtls/aes.h"
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#if defined(MBEDTLS_PADLOCK_C)
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#include "mbedtls/padlock.h"
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#endif
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#if defined(MBEDTLS_AESNI_C)
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#include "mbedtls/aesni.h"
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#endif
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#if !defined(MBEDTLS_AES_ALT)
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#include "arc4_alt.h"
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/*
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* 32-bit integer manipulation macros (little endian)
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*/
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#ifndef GET_UINT32_LE
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#define GET_UINT32_LE(n,b,i) \
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{ \
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(n) = ( (uint32_t) (b)[(i) ] ) \
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| ( (uint32_t) (b)[(i) + 1] << 8 ) \
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| ( (uint32_t) (b)[(i) + 2] << 16 ) \
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| ( (uint32_t) (b)[(i) + 3] << 24 ); \
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}
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#endif
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#ifndef PUT_UINT32_LE
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#define PUT_UINT32_LE(n,b,i) \
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{ \
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(b)[(i) ] = (unsigned char) ( ( (n) ) & 0xFF ); \
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(b)[(i) + 1] = (unsigned char) ( ( (n) >> 8 ) & 0xFF ); \
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(b)[(i) + 2] = (unsigned char) ( ( (n) >> 16 ) & 0xFF ); \
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(b)[(i) + 3] = (unsigned char) ( ( (n) >> 24 ) & 0xFF ); \
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}
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#endif
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#if defined(MBEDTLS_PADLOCK_C) && \
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( defined(MBEDTLS_HAVE_X86) || defined(MBEDTLS_PADLOCK_ALIGN16) )
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static int aes_padlock_ace = -1;
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#endif
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/*
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* Forward S-box & tables
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*/
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static unsigned char FSb[256];
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static uint32_t FT0[256];
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static uint32_t FT1[256];
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static uint32_t FT2[256];
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static uint32_t FT3[256];
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/*
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* Reverse S-box & tables
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*/
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static unsigned char RSb[256];
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static uint32_t RT0[256];
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static uint32_t RT1[256];
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static uint32_t RT2[256];
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static uint32_t RT3[256];
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/*
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* Round constants
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*/
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static uint32_t RCON[10];
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/*
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* Tables generation code
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*/
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#define ROTL8(x) ( ( x << 8 ) & 0xFFFFFFFF ) | ( x >> 24 )
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#define XTIME(x) ( ( x << 1 ) ^ ( ( x & 0x80 ) ? 0x1B : 0x00 ) )
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#define MUL(x,y) ( ( x && y ) ? pow[(log[x]+log[y]) % 255] : 0 )
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static int aes_init_done = 0;
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static void aes_gen_tables( void )
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{
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int i, x, y, z;
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int pow[256];
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int log[256];
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/*
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* compute pow and log tables over GF(2^8)
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*/
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for( i = 0, x = 1; i < 256; i++ )
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{
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pow[i] = x;
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log[x] = i;
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x = ( x ^ XTIME( x ) ) & 0xFF;
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}
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/*
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* calculate the round constants
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*/
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for( i = 0, x = 1; i < 10; i++ )
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{
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RCON[i] = (uint32_t) x;
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x = XTIME( x ) & 0xFF;
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}
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/*
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* generate the forward and reverse S-boxes
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*/
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FSb[0x00] = 0x63;
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RSb[0x63] = 0x00;
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for( i = 1; i < 256; i++ )
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{
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x = pow[255 - log[i]];
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y = x; y = ( ( y << 1 ) | ( y >> 7 ) ) & 0xFF;
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x ^= y; y = ( ( y << 1 ) | ( y >> 7 ) ) & 0xFF;
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x ^= y; y = ( ( y << 1 ) | ( y >> 7 ) ) & 0xFF;
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x ^= y; y = ( ( y << 1 ) | ( y >> 7 ) ) & 0xFF;
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x ^= y ^ 0x63;
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FSb[i] = (unsigned char) x;
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RSb[x] = (unsigned char) i;
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}
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/*
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* generate the forward and reverse tables
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*/
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for( i = 0; i < 256; i++ )
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{
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x = FSb[i];
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y = XTIME( x ) & 0xFF;
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z = ( y ^ x ) & 0xFF;
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FT0[i] = ( (uint32_t) y ) ^
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( (uint32_t) x << 8 ) ^
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( (uint32_t) x << 16 ) ^
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( (uint32_t) z << 24 );
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FT1[i] = ROTL8( FT0[i] );
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FT2[i] = ROTL8( FT1[i] );
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FT3[i] = ROTL8( FT2[i] );
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x = RSb[i];
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RT0[i] = ( (uint32_t) MUL( 0x0E, x ) ) ^
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( (uint32_t) MUL( 0x09, x ) << 8 ) ^
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( (uint32_t) MUL( 0x0D, x ) << 16 ) ^
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( (uint32_t) MUL( 0x0B, x ) << 24 );
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RT1[i] = ROTL8( RT0[i] );
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RT2[i] = ROTL8( RT1[i] );
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RT3[i] = ROTL8( RT2[i] );
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}
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}
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void mbedtls_aes_init( mbedtls_aes_context *ctx )
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{
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memset( ctx, 0, sizeof( mbedtls_aes_context ) );
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}
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void mbedtls_aes_free( mbedtls_aes_context *ctx )
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{
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if( ctx == NULL )
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return;
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mbedtls_zeroize( ctx, sizeof( mbedtls_aes_context ) );
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}
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/*
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* AES key schedule (encryption)
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*/
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#if !defined(MBEDTLS_AES_SETKEY_ENC_ALT)
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int mbedtls_aes_setkey_enc( mbedtls_aes_context *ctx, const unsigned char *key,
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unsigned int keybits )
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{
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unsigned int i;
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uint32_t *RK;
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if( aes_init_done == 0 )
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{
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aes_gen_tables();
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aes_init_done = 1;
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}
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switch( keybits )
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{
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case 128: ctx->nr = 10; break;
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case 192: ctx->nr = 12; break;
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case 256: ctx->nr = 14; break;
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default : return( MBEDTLS_ERR_AES_INVALID_KEY_LENGTH );
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}
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#if defined(MBEDTLS_PADLOCK_C) && defined(MBEDTLS_PADLOCK_ALIGN16)
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if( aes_padlock_ace == -1 )
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aes_padlock_ace = mbedtls_padlock_has_support( MBEDTLS_PADLOCK_ACE );
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if( aes_padlock_ace )
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ctx->rk = RK = MBEDTLS_PADLOCK_ALIGN16( ctx->buf );
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else
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#endif
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ctx->rk = RK = ctx->buf;
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#if defined(MBEDTLS_AESNI_C) && defined(MBEDTLS_HAVE_X86_64)
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if( mbedtls_aesni_has_support( MBEDTLS_AESNI_AES ) )
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return( mbedtls_aesni_setkey_enc( (unsigned char *) ctx->rk, key, keybits ) );
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#endif
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for( i = 0; i < ( keybits >> 5 ); i++ )
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{
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GET_UINT32_LE( RK[i], key, i << 2 );
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}
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switch( ctx->nr )
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{
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case 10:
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for( i = 0; i < 10; i++, RK += 4 )
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{
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RK[4] = RK[0] ^ RCON[i] ^
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( (uint32_t) FSb[ ( RK[3] >> 8 ) & 0xFF ] ) ^
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( (uint32_t) FSb[ ( RK[3] >> 16 ) & 0xFF ] << 8 ) ^
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( (uint32_t) FSb[ ( RK[3] >> 24 ) & 0xFF ] << 16 ) ^
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( (uint32_t) FSb[ ( RK[3] ) & 0xFF ] << 24 );
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RK[5] = RK[1] ^ RK[4];
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RK[6] = RK[2] ^ RK[5];
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RK[7] = RK[3] ^ RK[6];
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}
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break;
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case 12:
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for( i = 0; i < 8; i++, RK += 6 )
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{
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RK[6] = RK[0] ^ RCON[i] ^
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( (uint32_t) FSb[ ( RK[5] >> 8 ) & 0xFF ] ) ^
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( (uint32_t) FSb[ ( RK[5] >> 16 ) & 0xFF ] << 8 ) ^
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( (uint32_t) FSb[ ( RK[5] >> 24 ) & 0xFF ] << 16 ) ^
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( (uint32_t) FSb[ ( RK[5] ) & 0xFF ] << 24 );
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RK[7] = RK[1] ^ RK[6];
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RK[8] = RK[2] ^ RK[7];
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RK[9] = RK[3] ^ RK[8];
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RK[10] = RK[4] ^ RK[9];
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RK[11] = RK[5] ^ RK[10];
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}
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break;
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case 14:
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for( i = 0; i < 7; i++, RK += 8 )
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{
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RK[8] = RK[0] ^ RCON[i] ^
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( (uint32_t) FSb[ ( RK[7] >> 8 ) & 0xFF ] ) ^
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( (uint32_t) FSb[ ( RK[7] >> 16 ) & 0xFF ] << 8 ) ^
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( (uint32_t) FSb[ ( RK[7] >> 24 ) & 0xFF ] << 16 ) ^
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( (uint32_t) FSb[ ( RK[7] ) & 0xFF ] << 24 );
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RK[9] = RK[1] ^ RK[8];
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RK[10] = RK[2] ^ RK[9];
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RK[11] = RK[3] ^ RK[10];
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RK[12] = RK[4] ^
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( (uint32_t) FSb[ ( RK[11] ) & 0xFF ] ) ^
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( (uint32_t) FSb[ ( RK[11] >> 8 ) & 0xFF ] << 8 ) ^
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( (uint32_t) FSb[ ( RK[11] >> 16 ) & 0xFF ] << 16 ) ^
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( (uint32_t) FSb[ ( RK[11] >> 24 ) & 0xFF ] << 24 );
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RK[13] = RK[5] ^ RK[12];
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RK[14] = RK[6] ^ RK[13];
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RK[15] = RK[7] ^ RK[14];
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}
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break;
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}
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return( 0 );
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}
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#endif /* !MBEDTLS_AES_SETKEY_ENC_ALT */
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/*
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* AES key schedule (decryption)
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*/
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#if !defined(MBEDTLS_AES_SETKEY_DEC_ALT)
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int mbedtls_aes_setkey_dec( mbedtls_aes_context *ctx, const unsigned char *key,
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unsigned int keybits )
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{
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int i, j, ret;
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mbedtls_aes_context cty;
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uint32_t *RK;
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uint32_t *SK;
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mbedtls_aes_init( &cty );
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#if defined(MBEDTLS_PADLOCK_C) && defined(MBEDTLS_PADLOCK_ALIGN16)
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if( aes_padlock_ace == -1 )
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aes_padlock_ace = mbedtls_padlock_has_support( MBEDTLS_PADLOCK_ACE );
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if( aes_padlock_ace )
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ctx->rk = RK = MBEDTLS_PADLOCK_ALIGN16( ctx->buf );
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else
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#endif
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ctx->rk = RK = ctx->buf;
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/* Also checks keybits */
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if( ( ret = mbedtls_aes_setkey_enc( &cty, key, keybits ) ) != 0 )
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goto exit;
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ctx->nr = cty.nr;
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#if defined(MBEDTLS_AESNI_C) && defined(MBEDTLS_HAVE_X86_64)
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if( mbedtls_aesni_has_support( MBEDTLS_AESNI_AES ) )
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{
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mbedtls_aesni_inverse_key( (unsigned char *) ctx->rk,
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(const unsigned char *) cty.rk, ctx->nr );
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goto exit;
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}
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#endif
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SK = cty.rk + cty.nr * 4;
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*RK++ = *SK++;
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*RK++ = *SK++;
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*RK++ = *SK++;
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*RK++ = *SK++;
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for( i = ctx->nr - 1, SK -= 8; i > 0; i--, SK -= 8 )
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{
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for( j = 0; j < 4; j++, SK++ )
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{
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*RK++ = RT0[ FSb[ ( *SK ) & 0xFF ] ] ^
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RT1[ FSb[ ( *SK >> 8 ) & 0xFF ] ] ^
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RT2[ FSb[ ( *SK >> 16 ) & 0xFF ] ] ^
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RT3[ FSb[ ( *SK >> 24 ) & 0xFF ] ];
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}
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}
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*RK++ = *SK++;
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*RK++ = *SK++;
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*RK++ = *SK++;
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*RK++ = *SK++;
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exit:
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mbedtls_aes_free( &cty );
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return( ret );
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}
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#endif /* !MBEDTLS_AES_SETKEY_DEC_ALT */
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#define AES_FROUND(X0,X1,X2,X3,Y0,Y1,Y2,Y3) \
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{ \
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X0 = *RK++ ^ FT0[ ( Y0 ) & 0xFF ] ^ \
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FT1[ ( Y1 >> 8 ) & 0xFF ] ^ \
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FT2[ ( Y2 >> 16 ) & 0xFF ] ^ \
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FT3[ ( Y3 >> 24 ) & 0xFF ]; \
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\
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X1 = *RK++ ^ FT0[ ( Y1 ) & 0xFF ] ^ \
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FT1[ ( Y2 >> 8 ) & 0xFF ] ^ \
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FT2[ ( Y3 >> 16 ) & 0xFF ] ^ \
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FT3[ ( Y0 >> 24 ) & 0xFF ]; \
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\
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X2 = *RK++ ^ FT0[ ( Y2 ) & 0xFF ] ^ \
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FT1[ ( Y3 >> 8 ) & 0xFF ] ^ \
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FT2[ ( Y0 >> 16 ) & 0xFF ] ^ \
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FT3[ ( Y1 >> 24 ) & 0xFF ]; \
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\
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X3 = *RK++ ^ FT0[ ( Y3 ) & 0xFF ] ^ \
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FT1[ ( Y0 >> 8 ) & 0xFF ] ^ \
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FT2[ ( Y1 >> 16 ) & 0xFF ] ^ \
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FT3[ ( Y2 >> 24 ) & 0xFF ]; \
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}
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#define AES_RROUND(X0,X1,X2,X3,Y0,Y1,Y2,Y3) \
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{ \
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X0 = *RK++ ^ RT0[ ( Y0 ) & 0xFF ] ^ \
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RT1[ ( Y3 >> 8 ) & 0xFF ] ^ \
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RT2[ ( Y2 >> 16 ) & 0xFF ] ^ \
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RT3[ ( Y1 >> 24 ) & 0xFF ]; \
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\
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X1 = *RK++ ^ RT0[ ( Y1 ) & 0xFF ] ^ \
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RT1[ ( Y0 >> 8 ) & 0xFF ] ^ \
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RT2[ ( Y3 >> 16 ) & 0xFF ] ^ \
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RT3[ ( Y2 >> 24 ) & 0xFF ]; \
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\
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X2 = *RK++ ^ RT0[ ( Y2 ) & 0xFF ] ^ \
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RT1[ ( Y1 >> 8 ) & 0xFF ] ^ \
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RT2[ ( Y0 >> 16 ) & 0xFF ] ^ \
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RT3[ ( Y3 >> 24 ) & 0xFF ]; \
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\
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X3 = *RK++ ^ RT0[ ( Y3 ) & 0xFF ] ^ \
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RT1[ ( Y2 >> 8 ) & 0xFF ] ^ \
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RT2[ ( Y1 >> 16 ) & 0xFF ] ^ \
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RT3[ ( Y0 >> 24 ) & 0xFF ]; \
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}
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/*
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* AES-ECB block encryption
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*/
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#if !defined(MBEDTLS_AES_ENCRYPT_ALT)
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int mbedtls_internal_aes_encrypt( mbedtls_aes_context *ctx,
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const unsigned char input[16],
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unsigned char output[16] )
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{
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int i;
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uint32_t *RK, X0, X1, X2, X3, Y0, Y1, Y2, Y3;
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RK = ctx->rk;
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GET_UINT32_LE( X0, input, 0 ); X0 ^= *RK++;
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GET_UINT32_LE( X1, input, 4 ); X1 ^= *RK++;
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GET_UINT32_LE( X2, input, 8 ); X2 ^= *RK++;
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GET_UINT32_LE( X3, input, 12 ); X3 ^= *RK++;
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for( i = ( ctx->nr >> 1 ) - 1; i > 0; i-- )
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{
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AES_FROUND( Y0, Y1, Y2, Y3, X0, X1, X2, X3 );
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AES_FROUND( X0, X1, X2, X3, Y0, Y1, Y2, Y3 );
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}
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AES_FROUND( Y0, Y1, Y2, Y3, X0, X1, X2, X3 );
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X0 = *RK++ ^ \
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( (uint32_t) FSb[ ( Y0 ) & 0xFF ] ) ^
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( (uint32_t) FSb[ ( Y1 >> 8 ) & 0xFF ] << 8 ) ^
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( (uint32_t) FSb[ ( Y2 >> 16 ) & 0xFF ] << 16 ) ^
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( (uint32_t) FSb[ ( Y3 >> 24 ) & 0xFF ] << 24 );
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X1 = *RK++ ^ \
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( (uint32_t) FSb[ ( Y1 ) & 0xFF ] ) ^
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( (uint32_t) FSb[ ( Y2 >> 8 ) & 0xFF ] << 8 ) ^
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( (uint32_t) FSb[ ( Y3 >> 16 ) & 0xFF ] << 16 ) ^
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( (uint32_t) FSb[ ( Y0 >> 24 ) & 0xFF ] << 24 );
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X2 = *RK++ ^ \
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( (uint32_t) FSb[ ( Y2 ) & 0xFF ] ) ^
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( (uint32_t) FSb[ ( Y3 >> 8 ) & 0xFF ] << 8 ) ^
|
|
( (uint32_t) FSb[ ( Y0 >> 16 ) & 0xFF ] << 16 ) ^
|
|
( (uint32_t) FSb[ ( Y1 >> 24 ) & 0xFF ] << 24 );
|
|
|
|
X3 = *RK++ ^ \
|
|
( (uint32_t) FSb[ ( Y3 ) & 0xFF ] ) ^
|
|
( (uint32_t) FSb[ ( Y0 >> 8 ) & 0xFF ] << 8 ) ^
|
|
( (uint32_t) FSb[ ( Y1 >> 16 ) & 0xFF ] << 16 ) ^
|
|
( (uint32_t) FSb[ ( Y2 >> 24 ) & 0xFF ] << 24 );
|
|
|
|
PUT_UINT32_LE( X0, output, 0 );
|
|
PUT_UINT32_LE( X1, output, 4 );
|
|
PUT_UINT32_LE( X2, output, 8 );
|
|
PUT_UINT32_LE( X3, output, 12 );
|
|
|
|
return( 0 );
|
|
}
|
|
#endif /* !MBEDTLS_AES_ENCRYPT_ALT */
|
|
|
|
/*
|
|
* AES-ECB block decryption
|
|
*/
|
|
#if !defined(MBEDTLS_AES_DECRYPT_ALT)
|
|
int mbedtls_internal_aes_decrypt( mbedtls_aes_context *ctx,
|
|
const unsigned char input[16],
|
|
unsigned char output[16] )
|
|
{
|
|
int i;
|
|
uint32_t *RK, X0, X1, X2, X3, Y0, Y1, Y2, Y3;
|
|
|
|
RK = ctx->rk;
|
|
|
|
GET_UINT32_LE( X0, input, 0 ); X0 ^= *RK++;
|
|
GET_UINT32_LE( X1, input, 4 ); X1 ^= *RK++;
|
|
GET_UINT32_LE( X2, input, 8 ); X2 ^= *RK++;
|
|
GET_UINT32_LE( X3, input, 12 ); X3 ^= *RK++;
|
|
|
|
for( i = ( ctx->nr >> 1 ) - 1; i > 0; i-- )
|
|
{
|
|
AES_RROUND( Y0, Y1, Y2, Y3, X0, X1, X2, X3 );
|
|
AES_RROUND( X0, X1, X2, X3, Y0, Y1, Y2, Y3 );
|
|
}
|
|
|
|
AES_RROUND( Y0, Y1, Y2, Y3, X0, X1, X2, X3 );
|
|
|
|
X0 = *RK++ ^ \
|
|
( (uint32_t) RSb[ ( Y0 ) & 0xFF ] ) ^
|
|
( (uint32_t) RSb[ ( Y3 >> 8 ) & 0xFF ] << 8 ) ^
|
|
( (uint32_t) RSb[ ( Y2 >> 16 ) & 0xFF ] << 16 ) ^
|
|
( (uint32_t) RSb[ ( Y1 >> 24 ) & 0xFF ] << 24 );
|
|
|
|
X1 = *RK++ ^ \
|
|
( (uint32_t) RSb[ ( Y1 ) & 0xFF ] ) ^
|
|
( (uint32_t) RSb[ ( Y0 >> 8 ) & 0xFF ] << 8 ) ^
|
|
( (uint32_t) RSb[ ( Y3 >> 16 ) & 0xFF ] << 16 ) ^
|
|
( (uint32_t) RSb[ ( Y2 >> 24 ) & 0xFF ] << 24 );
|
|
|
|
X2 = *RK++ ^ \
|
|
( (uint32_t) RSb[ ( Y2 ) & 0xFF ] ) ^
|
|
( (uint32_t) RSb[ ( Y1 >> 8 ) & 0xFF ] << 8 ) ^
|
|
( (uint32_t) RSb[ ( Y0 >> 16 ) & 0xFF ] << 16 ) ^
|
|
( (uint32_t) RSb[ ( Y3 >> 24 ) & 0xFF ] << 24 );
|
|
|
|
X3 = *RK++ ^ \
|
|
( (uint32_t) RSb[ ( Y3 ) & 0xFF ] ) ^
|
|
( (uint32_t) RSb[ ( Y2 >> 8 ) & 0xFF ] << 8 ) ^
|
|
( (uint32_t) RSb[ ( Y1 >> 16 ) & 0xFF ] << 16 ) ^
|
|
( (uint32_t) RSb[ ( Y0 >> 24 ) & 0xFF ] << 24 );
|
|
|
|
PUT_UINT32_LE( X0, output, 0 );
|
|
PUT_UINT32_LE( X1, output, 4 );
|
|
PUT_UINT32_LE( X2, output, 8 );
|
|
PUT_UINT32_LE( X3, output, 12 );
|
|
|
|
return( 0 );
|
|
}
|
|
#endif /* !MBEDTLS_AES_DECRYPT_ALT */
|
|
|
|
/*
|
|
* AES-ECB block encryption/decryption
|
|
*/
|
|
int mbedtls_aes_crypt_ecb( mbedtls_aes_context *ctx,
|
|
int mode,
|
|
const unsigned char input[16],
|
|
unsigned char output[16] )
|
|
{
|
|
#if defined(MBEDTLS_AESNI_C) && defined(MBEDTLS_HAVE_X86_64)
|
|
if( mbedtls_aesni_has_support( MBEDTLS_AESNI_AES ) )
|
|
return( mbedtls_aesni_crypt_ecb( ctx, mode, input, output ) );
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_PADLOCK_C) && defined(MBEDTLS_HAVE_X86)
|
|
if( aes_padlock_ace )
|
|
{
|
|
if( mbedtls_padlock_xcryptecb( ctx, mode, input, output ) == 0 )
|
|
return( 0 );
|
|
|
|
// If padlock data misaligned, we just fall back to
|
|
// unaccelerated mode
|
|
//
|
|
}
|
|
#endif
|
|
|
|
if( mode == MBEDTLS_AES_ENCRYPT )
|
|
return( mbedtls_internal_aes_encrypt( ctx, input, output ) );
|
|
else
|
|
return( mbedtls_internal_aes_decrypt( ctx, input, output ) );
|
|
}
|
|
|
|
#if defined(MBEDTLS_CIPHER_MODE_CBC)
|
|
/*
|
|
* AES-CBC buffer encryption/decryption
|
|
*/
|
|
int mbedtls_aes_crypt_cbc( mbedtls_aes_context *ctx,
|
|
int mode,
|
|
size_t length,
|
|
unsigned char iv[16],
|
|
const unsigned char *input,
|
|
unsigned char *output )
|
|
{
|
|
int i;
|
|
unsigned char temp[16];
|
|
|
|
if( length % 16 )
|
|
return( MBEDTLS_ERR_AES_INVALID_INPUT_LENGTH );
|
|
|
|
#if defined(MBEDTLS_PADLOCK_C) && defined(MBEDTLS_HAVE_X86)
|
|
if( aes_padlock_ace )
|
|
{
|
|
if( mbedtls_padlock_xcryptcbc( ctx, mode, length, iv, input, output ) == 0 )
|
|
return( 0 );
|
|
|
|
// If padlock data misaligned, we just fall back to
|
|
// unaccelerated mode
|
|
//
|
|
}
|
|
#endif
|
|
|
|
if( mode == MBEDTLS_AES_DECRYPT )
|
|
{
|
|
while( length > 0 )
|
|
{
|
|
memcpy( temp, input, 16 );
|
|
mbedtls_aes_crypt_ecb( ctx, mode, input, output );
|
|
|
|
for( i = 0; i < 16; i++ )
|
|
output[i] = (unsigned char)( output[i] ^ iv[i] );
|
|
|
|
memcpy( iv, temp, 16 );
|
|
|
|
input += 16;
|
|
output += 16;
|
|
length -= 16;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
while( length > 0 )
|
|
{
|
|
for( i = 0; i < 16; i++ )
|
|
output[i] = (unsigned char)( input[i] ^ iv[i] );
|
|
|
|
mbedtls_aes_crypt_ecb( ctx, mode, output, output );
|
|
memcpy( iv, output, 16 );
|
|
|
|
input += 16;
|
|
output += 16;
|
|
length -= 16;
|
|
}
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
#endif /* MBEDTLS_CIPHER_MODE_CBC */
|
|
|
|
#if defined(MBEDTLS_CIPHER_MODE_CFB)
|
|
/*
|
|
* AES-CFB128 buffer encryption/decryption
|
|
*/
|
|
int mbedtls_aes_crypt_cfb128( mbedtls_aes_context *ctx,
|
|
int mode,
|
|
size_t length,
|
|
size_t *iv_off,
|
|
unsigned char iv[16],
|
|
const unsigned char *input,
|
|
unsigned char *output )
|
|
{
|
|
int c;
|
|
size_t n = *iv_off;
|
|
|
|
if( mode == MBEDTLS_AES_DECRYPT )
|
|
{
|
|
while( length-- )
|
|
{
|
|
if( n == 0 )
|
|
mbedtls_aes_crypt_ecb( ctx, MBEDTLS_AES_ENCRYPT, iv, iv );
|
|
|
|
c = *input++;
|
|
*output++ = (unsigned char)( c ^ iv[n] );
|
|
iv[n] = (unsigned char) c;
|
|
|
|
n = ( n + 1 ) & 0x0F;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
while( length-- )
|
|
{
|
|
if( n == 0 )
|
|
mbedtls_aes_crypt_ecb( ctx, MBEDTLS_AES_ENCRYPT, iv, iv );
|
|
|
|
iv[n] = *output++ = (unsigned char)( iv[n] ^ *input++ );
|
|
|
|
n = ( n + 1 ) & 0x0F;
|
|
}
|
|
}
|
|
|
|
*iv_off = n;
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
/*
|
|
* AES-CFB8 buffer encryption/decryption
|
|
*/
|
|
int mbedtls_aes_crypt_cfb8( mbedtls_aes_context *ctx,
|
|
int mode,
|
|
size_t length,
|
|
unsigned char iv[16],
|
|
const unsigned char *input,
|
|
unsigned char *output )
|
|
{
|
|
unsigned char c;
|
|
unsigned char ov[17];
|
|
|
|
while( length-- )
|
|
{
|
|
memcpy( ov, iv, 16 );
|
|
mbedtls_aes_crypt_ecb( ctx, MBEDTLS_AES_ENCRYPT, iv, iv );
|
|
|
|
if( mode == MBEDTLS_AES_DECRYPT )
|
|
ov[16] = *input;
|
|
|
|
c = *output++ = (unsigned char)( iv[0] ^ *input++ );
|
|
|
|
if( mode == MBEDTLS_AES_ENCRYPT )
|
|
ov[16] = c;
|
|
|
|
memcpy( iv, ov + 1, 16 );
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
#endif /*MBEDTLS_CIPHER_MODE_CFB */
|
|
|
|
#if defined(MBEDTLS_CIPHER_MODE_CTR)
|
|
/*
|
|
* AES-CTR buffer encryption/decryption
|
|
*/
|
|
int mbedtls_aes_crypt_ctr( mbedtls_aes_context *ctx,
|
|
size_t length,
|
|
size_t *nc_off,
|
|
unsigned char nonce_counter[16],
|
|
unsigned char stream_block[16],
|
|
const unsigned char *input,
|
|
unsigned char *output )
|
|
{
|
|
int c, i;
|
|
size_t n = *nc_off;
|
|
|
|
while( length-- )
|
|
{
|
|
if( n == 0 ) {
|
|
mbedtls_aes_crypt_ecb( ctx, MBEDTLS_AES_ENCRYPT, nonce_counter, stream_block );
|
|
|
|
for( i = 16; i > 0; i-- )
|
|
if( ++nonce_counter[i - 1] != 0 )
|
|
break;
|
|
}
|
|
c = *input++;
|
|
*output++ = (unsigned char)( c ^ stream_block[n] );
|
|
|
|
n = ( n + 1 ) & 0x0F;
|
|
}
|
|
|
|
*nc_off = n;
|
|
|
|
return( 0 );
|
|
}
|
|
#endif /* MBEDTLS_CIPHER_MODE_CTR */
|
|
|
|
#endif /* !MBEDTLS_AES_ALT */
|
|
|
|
#endif /* MBEDTLS_AES_C */
|