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https://github.com/dolphin-emu/dolphin.git
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a48e284317
There were some fixes back on March 13th, 2014 for fixing compiling on MIPS64. Also some fixes on June 25th, 2014 for SPARC64 fixes. Probably more things, but those are what I care about.
549 lines
15 KiB
C
549 lines
15 KiB
C
/*
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* CTR_DRBG implementation based on AES-256 (NIST SP 800-90)
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*
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* Copyright (C) 2006-2014, Brainspark B.V.
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*
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* This file is part of PolarSSL (http://www.polarssl.org)
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* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/*
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* The NIST SP 800-90 DRBGs are described in the following publucation.
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*
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* http://csrc.nist.gov/publications/nistpubs/800-90/SP800-90revised_March2007.pdf
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*/
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#if !defined(POLARSSL_CONFIG_FILE)
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#include "polarssl/config.h"
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#else
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#include POLARSSL_CONFIG_FILE
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#endif
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#if defined(POLARSSL_CTR_DRBG_C)
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#include "polarssl/ctr_drbg.h"
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#if defined(POLARSSL_FS_IO)
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#include <stdio.h>
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#endif
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#if defined(POLARSSL_PLATFORM_C)
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#include "polarssl/platform.h"
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#else
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#define polarssl_printf printf
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#endif
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/* Implementation that should never be optimized out by the compiler */
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static void polarssl_zeroize( void *v, size_t n ) {
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volatile unsigned char *p = v; while( n-- ) *p++ = 0;
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}
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/*
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* Non-public function wrapped by ctr_crbg_init(). Necessary to allow NIST
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* tests to succeed (which require known length fixed entropy)
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*/
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int ctr_drbg_init_entropy_len(
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ctr_drbg_context *ctx,
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int (*f_entropy)(void *, unsigned char *, size_t),
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void *p_entropy,
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const unsigned char *custom,
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size_t len,
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size_t entropy_len )
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{
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int ret;
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unsigned char key[CTR_DRBG_KEYSIZE];
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memset( ctx, 0, sizeof(ctr_drbg_context) );
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memset( key, 0, CTR_DRBG_KEYSIZE );
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aes_init( &ctx->aes_ctx );
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ctx->f_entropy = f_entropy;
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ctx->p_entropy = p_entropy;
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ctx->entropy_len = entropy_len;
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ctx->reseed_interval = CTR_DRBG_RESEED_INTERVAL;
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/*
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* Initialize with an empty key
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*/
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aes_setkey_enc( &ctx->aes_ctx, key, CTR_DRBG_KEYBITS );
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if( ( ret = ctr_drbg_reseed( ctx, custom, len ) ) != 0 )
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return( ret );
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return( 0 );
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}
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int ctr_drbg_init( ctr_drbg_context *ctx,
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int (*f_entropy)(void *, unsigned char *, size_t),
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void *p_entropy,
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const unsigned char *custom,
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size_t len )
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{
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return( ctr_drbg_init_entropy_len( ctx, f_entropy, p_entropy, custom, len,
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CTR_DRBG_ENTROPY_LEN ) );
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}
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void ctr_drbg_free( ctr_drbg_context *ctx )
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{
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if( ctx == NULL )
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return;
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aes_free( &ctx->aes_ctx );
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polarssl_zeroize( ctx, sizeof( ctr_drbg_context ) );
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}
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void ctr_drbg_set_prediction_resistance( ctr_drbg_context *ctx, int resistance )
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{
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ctx->prediction_resistance = resistance;
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}
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void ctr_drbg_set_entropy_len( ctr_drbg_context *ctx, size_t len )
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{
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ctx->entropy_len = len;
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}
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void ctr_drbg_set_reseed_interval( ctr_drbg_context *ctx, int interval )
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{
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ctx->reseed_interval = interval;
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}
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static int block_cipher_df( unsigned char *output,
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const unsigned char *data, size_t data_len )
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{
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unsigned char buf[CTR_DRBG_MAX_SEED_INPUT + CTR_DRBG_BLOCKSIZE + 16];
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unsigned char tmp[CTR_DRBG_SEEDLEN];
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unsigned char key[CTR_DRBG_KEYSIZE];
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unsigned char chain[CTR_DRBG_BLOCKSIZE];
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unsigned char *p, *iv;
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aes_context aes_ctx;
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int i, j;
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size_t buf_len, use_len;
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memset( buf, 0, CTR_DRBG_MAX_SEED_INPUT + CTR_DRBG_BLOCKSIZE + 16 );
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aes_init( &aes_ctx );
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/*
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* Construct IV (16 bytes) and S in buffer
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* IV = Counter (in 32-bits) padded to 16 with zeroes
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* S = Length input string (in 32-bits) || Length of output (in 32-bits) ||
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* data || 0x80
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* (Total is padded to a multiple of 16-bytes with zeroes)
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*/
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p = buf + CTR_DRBG_BLOCKSIZE;
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*p++ = ( data_len >> 24 ) & 0xff;
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*p++ = ( data_len >> 16 ) & 0xff;
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*p++ = ( data_len >> 8 ) & 0xff;
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*p++ = ( data_len ) & 0xff;
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p += 3;
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*p++ = CTR_DRBG_SEEDLEN;
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memcpy( p, data, data_len );
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p[data_len] = 0x80;
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buf_len = CTR_DRBG_BLOCKSIZE + 8 + data_len + 1;
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for( i = 0; i < CTR_DRBG_KEYSIZE; i++ )
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key[i] = i;
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aes_setkey_enc( &aes_ctx, key, CTR_DRBG_KEYBITS );
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/*
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* Reduce data to POLARSSL_CTR_DRBG_SEEDLEN bytes of data
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*/
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for( j = 0; j < CTR_DRBG_SEEDLEN; j += CTR_DRBG_BLOCKSIZE )
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{
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p = buf;
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memset( chain, 0, CTR_DRBG_BLOCKSIZE );
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use_len = buf_len;
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while( use_len > 0 )
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{
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for( i = 0; i < CTR_DRBG_BLOCKSIZE; i++ )
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chain[i] ^= p[i];
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p += CTR_DRBG_BLOCKSIZE;
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use_len -= ( use_len >= CTR_DRBG_BLOCKSIZE ) ?
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CTR_DRBG_BLOCKSIZE : use_len;
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aes_crypt_ecb( &aes_ctx, AES_ENCRYPT, chain, chain );
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}
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memcpy( tmp + j, chain, CTR_DRBG_BLOCKSIZE );
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/*
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* Update IV
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*/
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buf[3]++;
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}
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/*
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* Do final encryption with reduced data
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*/
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aes_setkey_enc( &aes_ctx, tmp, CTR_DRBG_KEYBITS );
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iv = tmp + CTR_DRBG_KEYSIZE;
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p = output;
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for( j = 0; j < CTR_DRBG_SEEDLEN; j += CTR_DRBG_BLOCKSIZE )
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{
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aes_crypt_ecb( &aes_ctx, AES_ENCRYPT, iv, iv );
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memcpy( p, iv, CTR_DRBG_BLOCKSIZE );
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p += CTR_DRBG_BLOCKSIZE;
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}
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aes_free( &aes_ctx );
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return( 0 );
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}
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static int ctr_drbg_update_internal( ctr_drbg_context *ctx,
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const unsigned char data[CTR_DRBG_SEEDLEN] )
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{
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unsigned char tmp[CTR_DRBG_SEEDLEN];
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unsigned char *p = tmp;
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int i, j;
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memset( tmp, 0, CTR_DRBG_SEEDLEN );
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for( j = 0; j < CTR_DRBG_SEEDLEN; j += CTR_DRBG_BLOCKSIZE )
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{
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/*
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* Increase counter
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*/
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for( i = CTR_DRBG_BLOCKSIZE; i > 0; i-- )
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if( ++ctx->counter[i - 1] != 0 )
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break;
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/*
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* Crypt counter block
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*/
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aes_crypt_ecb( &ctx->aes_ctx, AES_ENCRYPT, ctx->counter, p );
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p += CTR_DRBG_BLOCKSIZE;
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}
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for( i = 0; i < CTR_DRBG_SEEDLEN; i++ )
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tmp[i] ^= data[i];
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/*
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* Update key and counter
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*/
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aes_setkey_enc( &ctx->aes_ctx, tmp, CTR_DRBG_KEYBITS );
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memcpy( ctx->counter, tmp + CTR_DRBG_KEYSIZE, CTR_DRBG_BLOCKSIZE );
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return( 0 );
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}
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void ctr_drbg_update( ctr_drbg_context *ctx,
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const unsigned char *additional, size_t add_len )
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{
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unsigned char add_input[CTR_DRBG_SEEDLEN];
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if( add_len > 0 )
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{
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block_cipher_df( add_input, additional, add_len );
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ctr_drbg_update_internal( ctx, add_input );
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}
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}
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int ctr_drbg_reseed( ctr_drbg_context *ctx,
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const unsigned char *additional, size_t len )
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{
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unsigned char seed[CTR_DRBG_MAX_SEED_INPUT];
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size_t seedlen = 0;
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if( ctx->entropy_len + len > CTR_DRBG_MAX_SEED_INPUT )
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return( POLARSSL_ERR_CTR_DRBG_INPUT_TOO_BIG );
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memset( seed, 0, CTR_DRBG_MAX_SEED_INPUT );
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/*
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* Gather entropy_len bytes of entropy to seed state
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*/
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if( 0 != ctx->f_entropy( ctx->p_entropy, seed,
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ctx->entropy_len ) )
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{
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return( POLARSSL_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED );
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}
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seedlen += ctx->entropy_len;
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/*
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* Add additional data
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*/
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if( additional && len )
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{
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memcpy( seed + seedlen, additional, len );
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seedlen += len;
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}
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/*
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* Reduce to 384 bits
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*/
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block_cipher_df( seed, seed, seedlen );
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/*
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* Update state
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*/
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ctr_drbg_update_internal( ctx, seed );
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ctx->reseed_counter = 1;
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return( 0 );
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}
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int ctr_drbg_random_with_add( void *p_rng,
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unsigned char *output, size_t output_len,
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const unsigned char *additional, size_t add_len )
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{
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int ret = 0;
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ctr_drbg_context *ctx = (ctr_drbg_context *) p_rng;
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unsigned char add_input[CTR_DRBG_SEEDLEN];
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unsigned char *p = output;
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unsigned char tmp[CTR_DRBG_BLOCKSIZE];
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int i;
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size_t use_len;
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if( output_len > CTR_DRBG_MAX_REQUEST )
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return( POLARSSL_ERR_CTR_DRBG_REQUEST_TOO_BIG );
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if( add_len > CTR_DRBG_MAX_INPUT )
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return( POLARSSL_ERR_CTR_DRBG_INPUT_TOO_BIG );
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memset( add_input, 0, CTR_DRBG_SEEDLEN );
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if( ctx->reseed_counter > ctx->reseed_interval ||
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ctx->prediction_resistance )
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{
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if( ( ret = ctr_drbg_reseed( ctx, additional, add_len ) ) != 0 )
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return( ret );
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add_len = 0;
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}
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if( add_len > 0 )
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{
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block_cipher_df( add_input, additional, add_len );
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ctr_drbg_update_internal( ctx, add_input );
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}
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while( output_len > 0 )
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{
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/*
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* Increase counter
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*/
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for( i = CTR_DRBG_BLOCKSIZE; i > 0; i-- )
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if( ++ctx->counter[i - 1] != 0 )
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break;
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/*
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* Crypt counter block
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*/
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aes_crypt_ecb( &ctx->aes_ctx, AES_ENCRYPT, ctx->counter, tmp );
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use_len = ( output_len > CTR_DRBG_BLOCKSIZE ) ? CTR_DRBG_BLOCKSIZE :
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output_len;
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/*
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* Copy random block to destination
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*/
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memcpy( p, tmp, use_len );
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p += use_len;
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output_len -= use_len;
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}
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ctr_drbg_update_internal( ctx, add_input );
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ctx->reseed_counter++;
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return( 0 );
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}
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int ctr_drbg_random( void *p_rng, unsigned char *output, size_t output_len )
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{
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return ctr_drbg_random_with_add( p_rng, output, output_len, NULL, 0 );
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}
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#if defined(POLARSSL_FS_IO)
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int ctr_drbg_write_seed_file( ctr_drbg_context *ctx, const char *path )
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{
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int ret = POLARSSL_ERR_CTR_DRBG_FILE_IO_ERROR;
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FILE *f;
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unsigned char buf[ CTR_DRBG_MAX_INPUT ];
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if( ( f = fopen( path, "wb" ) ) == NULL )
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return( POLARSSL_ERR_CTR_DRBG_FILE_IO_ERROR );
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if( ( ret = ctr_drbg_random( ctx, buf, CTR_DRBG_MAX_INPUT ) ) != 0 )
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goto exit;
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if( fwrite( buf, 1, CTR_DRBG_MAX_INPUT, f ) != CTR_DRBG_MAX_INPUT )
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{
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ret = POLARSSL_ERR_CTR_DRBG_FILE_IO_ERROR;
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goto exit;
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}
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ret = 0;
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exit:
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fclose( f );
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return( ret );
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}
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int ctr_drbg_update_seed_file( ctr_drbg_context *ctx, const char *path )
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{
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FILE *f;
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size_t n;
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unsigned char buf[ CTR_DRBG_MAX_INPUT ];
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if( ( f = fopen( path, "rb" ) ) == NULL )
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return( POLARSSL_ERR_CTR_DRBG_FILE_IO_ERROR );
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fseek( f, 0, SEEK_END );
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n = (size_t) ftell( f );
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fseek( f, 0, SEEK_SET );
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if( n > CTR_DRBG_MAX_INPUT )
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{
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fclose( f );
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return( POLARSSL_ERR_CTR_DRBG_INPUT_TOO_BIG );
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}
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if( fread( buf, 1, n, f ) != n )
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{
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fclose( f );
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return( POLARSSL_ERR_CTR_DRBG_FILE_IO_ERROR );
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}
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fclose( f );
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ctr_drbg_update( ctx, buf, n );
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return( ctr_drbg_write_seed_file( ctx, path ) );
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}
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#endif /* POLARSSL_FS_IO */
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#if defined(POLARSSL_SELF_TEST)
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#include <stdio.h>
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static unsigned char entropy_source_pr[96] =
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{ 0xc1, 0x80, 0x81, 0xa6, 0x5d, 0x44, 0x02, 0x16,
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0x19, 0xb3, 0xf1, 0x80, 0xb1, 0xc9, 0x20, 0x02,
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0x6a, 0x54, 0x6f, 0x0c, 0x70, 0x81, 0x49, 0x8b,
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0x6e, 0xa6, 0x62, 0x52, 0x6d, 0x51, 0xb1, 0xcb,
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0x58, 0x3b, 0xfa, 0xd5, 0x37, 0x5f, 0xfb, 0xc9,
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0xff, 0x46, 0xd2, 0x19, 0xc7, 0x22, 0x3e, 0x95,
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0x45, 0x9d, 0x82, 0xe1, 0xe7, 0x22, 0x9f, 0x63,
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0x31, 0x69, 0xd2, 0x6b, 0x57, 0x47, 0x4f, 0xa3,
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0x37, 0xc9, 0x98, 0x1c, 0x0b, 0xfb, 0x91, 0x31,
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0x4d, 0x55, 0xb9, 0xe9, 0x1c, 0x5a, 0x5e, 0xe4,
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0x93, 0x92, 0xcf, 0xc5, 0x23, 0x12, 0xd5, 0x56,
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0x2c, 0x4a, 0x6e, 0xff, 0xdc, 0x10, 0xd0, 0x68 };
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static unsigned char entropy_source_nopr[64] =
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{ 0x5a, 0x19, 0x4d, 0x5e, 0x2b, 0x31, 0x58, 0x14,
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0x54, 0xde, 0xf6, 0x75, 0xfb, 0x79, 0x58, 0xfe,
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0xc7, 0xdb, 0x87, 0x3e, 0x56, 0x89, 0xfc, 0x9d,
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0x03, 0x21, 0x7c, 0x68, 0xd8, 0x03, 0x38, 0x20,
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0xf9, 0xe6, 0x5e, 0x04, 0xd8, 0x56, 0xf3, 0xa9,
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0xc4, 0x4a, 0x4c, 0xbd, 0xc1, 0xd0, 0x08, 0x46,
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0xf5, 0x98, 0x3d, 0x77, 0x1c, 0x1b, 0x13, 0x7e,
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0x4e, 0x0f, 0x9d, 0x8e, 0xf4, 0x09, 0xf9, 0x2e };
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static const unsigned char nonce_pers_pr[16] =
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{ 0xd2, 0x54, 0xfc, 0xff, 0x02, 0x1e, 0x69, 0xd2,
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0x29, 0xc9, 0xcf, 0xad, 0x85, 0xfa, 0x48, 0x6c };
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static const unsigned char nonce_pers_nopr[16] =
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{ 0x1b, 0x54, 0xb8, 0xff, 0x06, 0x42, 0xbf, 0xf5,
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0x21, 0xf1, 0x5c, 0x1c, 0x0b, 0x66, 0x5f, 0x3f };
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static const unsigned char result_pr[16] =
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{ 0x34, 0x01, 0x16, 0x56, 0xb4, 0x29, 0x00, 0x8f,
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0x35, 0x63, 0xec, 0xb5, 0xf2, 0x59, 0x07, 0x23 };
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static const unsigned char result_nopr[16] =
|
|
{ 0xa0, 0x54, 0x30, 0x3d, 0x8a, 0x7e, 0xa9, 0x88,
|
|
0x9d, 0x90, 0x3e, 0x07, 0x7c, 0x6f, 0x21, 0x8f };
|
|
|
|
static size_t test_offset;
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|
static int ctr_drbg_self_test_entropy( void *data, unsigned char *buf,
|
|
size_t len )
|
|
{
|
|
const unsigned char *p = data;
|
|
memcpy( buf, p + test_offset, len );
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|
test_offset += len;
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|
return( 0 );
|
|
}
|
|
|
|
#define CHK( c ) if( (c) != 0 ) \
|
|
{ \
|
|
if( verbose != 0 ) \
|
|
polarssl_printf( "failed\n" ); \
|
|
return( 1 ); \
|
|
}
|
|
|
|
/*
|
|
* Checkup routine
|
|
*/
|
|
int ctr_drbg_self_test( int verbose )
|
|
{
|
|
ctr_drbg_context ctx;
|
|
unsigned char buf[16];
|
|
|
|
/*
|
|
* Based on a NIST CTR_DRBG test vector (PR = True)
|
|
*/
|
|
if( verbose != 0 )
|
|
polarssl_printf( " CTR_DRBG (PR = TRUE) : " );
|
|
|
|
test_offset = 0;
|
|
CHK( ctr_drbg_init_entropy_len( &ctx, ctr_drbg_self_test_entropy,
|
|
entropy_source_pr, nonce_pers_pr, 16, 32 ) );
|
|
ctr_drbg_set_prediction_resistance( &ctx, CTR_DRBG_PR_ON );
|
|
CHK( ctr_drbg_random( &ctx, buf, CTR_DRBG_BLOCKSIZE ) );
|
|
CHK( ctr_drbg_random( &ctx, buf, CTR_DRBG_BLOCKSIZE ) );
|
|
CHK( memcmp( buf, result_pr, CTR_DRBG_BLOCKSIZE ) );
|
|
|
|
if( verbose != 0 )
|
|
polarssl_printf( "passed\n" );
|
|
|
|
/*
|
|
* Based on a NIST CTR_DRBG test vector (PR = FALSE)
|
|
*/
|
|
if( verbose != 0 )
|
|
polarssl_printf( " CTR_DRBG (PR = FALSE): " );
|
|
|
|
test_offset = 0;
|
|
CHK( ctr_drbg_init_entropy_len( &ctx, ctr_drbg_self_test_entropy,
|
|
entropy_source_nopr, nonce_pers_nopr, 16, 32 ) );
|
|
CHK( ctr_drbg_random( &ctx, buf, 16 ) );
|
|
CHK( ctr_drbg_reseed( &ctx, NULL, 0 ) );
|
|
CHK( ctr_drbg_random( &ctx, buf, 16 ) );
|
|
CHK( memcmp( buf, result_nopr, 16 ) );
|
|
|
|
if( verbose != 0 )
|
|
polarssl_printf( "passed\n" );
|
|
|
|
if( verbose != 0 )
|
|
polarssl_printf( "\n" );
|
|
|
|
return( 0 );
|
|
}
|
|
#endif /* POLARSSL_SELF_TEST */
|
|
|
|
#endif /* POLARSSL_CTR_DRBG_C */
|