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Diffstat (limited to 'polarssl/src/library/ctr_drbg.c')
-rw-r--r--polarssl/src/library/ctr_drbg.c562
1 files changed, 0 insertions, 562 deletions
diff --git a/polarssl/src/library/ctr_drbg.c b/polarssl/src/library/ctr_drbg.c
deleted file mode 100644
index 1de7f05..0000000
--- a/polarssl/src/library/ctr_drbg.c
+++ /dev/null
@@ -1,562 +0,0 @@
-/*
- * CTR_DRBG implementation based on AES-256 (NIST SP 800-90)
- *
- * Copyright (C) 2006-2011, Brainspark B.V.
- *
- * This file is part of PolarSSL (http://www.polarssl.org)
- * Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
- *
- * All rights reserved.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
-/*
- * The NIST SP 800-90 DRBGs are described in the following publucation.
- *
- * http://csrc.nist.gov/publications/nistpubs/800-90/SP800-90revised_March2007.pdf
- */
-
-#include "polarssl/config.h"
-
-#if defined(POLARSSL_CTR_DRBG_C)
-
-#include "polarssl/ctr_drbg.h"
-
-#if defined(POLARSSL_FS_IO)
-#include <stdio.h>
-#endif
-
-/*
- * Non-public function wrapped by ctr_crbg_init(). Necessary to allow NIST
- * tests to succeed (which require known length fixed entropy)
- */
-int ctr_drbg_init_entropy_len(
- ctr_drbg_context *ctx,
- int (*f_entropy)(void *, unsigned char *, size_t),
- void *p_entropy,
- const unsigned char *custom,
- size_t len,
- size_t entropy_len )
-{
- int ret;
- unsigned char key[CTR_DRBG_KEYSIZE];
-
- memset( ctx, 0, sizeof(ctr_drbg_context) );
- memset( key, 0, CTR_DRBG_KEYSIZE );
-
- ctx->f_entropy = f_entropy;
- ctx->p_entropy = p_entropy;
-
- ctx->entropy_len = entropy_len;
- ctx->reseed_interval = CTR_DRBG_RESEED_INTERVAL;
-
- /*
- * Initialize with an empty key
- */
- aes_setkey_enc( &ctx->aes_ctx, key, CTR_DRBG_KEYBITS );
-
- if( ( ret = ctr_drbg_reseed( ctx, custom, len ) ) != 0 )
- return( ret );
-
- return( 0 );
-}
-
-int ctr_drbg_init( ctr_drbg_context *ctx,
- int (*f_entropy)(void *, unsigned char *, size_t),
- void *p_entropy,
- const unsigned char *custom,
- size_t len )
-{
- return( ctr_drbg_init_entropy_len( ctx, f_entropy, p_entropy, custom, len,
- CTR_DRBG_ENTROPY_LEN ) );
-}
-
-void ctr_drbg_set_prediction_resistance( ctr_drbg_context *ctx, int resistance )
-{
- ctx->prediction_resistance = resistance;
-}
-
-void ctr_drbg_set_entropy_len( ctr_drbg_context *ctx, size_t len )
-{
- ctx->entropy_len = len;
-}
-
-void ctr_drbg_set_reseed_interval( ctr_drbg_context *ctx, int interval )
-{
- ctx->reseed_interval = interval;
-}
-
-int block_cipher_df( unsigned char *output,
- const unsigned char *data, size_t data_len )
-{
- unsigned char buf[CTR_DRBG_MAX_SEED_INPUT + CTR_DRBG_BLOCKSIZE + 16];
- unsigned char tmp[CTR_DRBG_SEEDLEN];
- unsigned char key[CTR_DRBG_KEYSIZE];
- unsigned char chain[CTR_DRBG_BLOCKSIZE];
- unsigned char *p = buf, *iv;
- aes_context aes_ctx;
-
- int i, j, buf_len, use_len;
-
- memset( buf, 0, CTR_DRBG_MAX_SEED_INPUT + CTR_DRBG_BLOCKSIZE + 16 );
-
- /*
- * Construct IV (16 bytes) and S in buffer
- * IV = Counter (in 32-bits) padded to 16 with zeroes
- * S = Length input string (in 32-bits) || Length of output (in 32-bits) ||
- * data || 0x80
- * (Total is padded to a multiple of 16-bytes with zeroes)
- */
- p = buf + CTR_DRBG_BLOCKSIZE;
- *p++ = ( data_len >> 24 ) & 0xff;
- *p++ = ( data_len >> 16 ) & 0xff;
- *p++ = ( data_len >> 8 ) & 0xff;
- *p++ = ( data_len ) & 0xff;
- p += 3;
- *p++ = CTR_DRBG_SEEDLEN;
- memcpy( p, data, data_len );
- p[data_len] = 0x80;
-
- buf_len = CTR_DRBG_BLOCKSIZE + 8 + data_len + 1;
-
- for( i = 0; i < CTR_DRBG_KEYSIZE; i++ )
- key[i] = i;
-
- aes_setkey_enc( &aes_ctx, key, CTR_DRBG_KEYBITS );
-
- /*
- * Reduce data to POLARSSL_CTR_DRBG_SEEDLEN bytes of data
- */
- for( j = 0; j < CTR_DRBG_SEEDLEN; j += CTR_DRBG_BLOCKSIZE )
- {
- p = buf;
- memset( chain, 0, CTR_DRBG_BLOCKSIZE );
- use_len = buf_len;
-
- while( use_len > 0 )
- {
- for( i = 0; i < CTR_DRBG_BLOCKSIZE; i++ )
- chain[i] ^= p[i];
- p += CTR_DRBG_BLOCKSIZE;
- use_len -= CTR_DRBG_BLOCKSIZE;
-
- aes_crypt_ecb( &aes_ctx, AES_ENCRYPT, chain, chain );
- }
-
- memcpy( tmp + j, chain, CTR_DRBG_BLOCKSIZE );
-
- /*
- * Update IV
- */
- buf[3]++;
- }
-
- /*
- * Do final encryption with reduced data
- */
- aes_setkey_enc( &aes_ctx, tmp, CTR_DRBG_KEYBITS );
- iv = tmp + CTR_DRBG_KEYSIZE;
- p = output;
-
- for( j = 0; j < CTR_DRBG_SEEDLEN; j += CTR_DRBG_BLOCKSIZE )
- {
- aes_crypt_ecb( &aes_ctx, AES_ENCRYPT, iv, iv );
- memcpy( p, iv, CTR_DRBG_BLOCKSIZE );
- p += CTR_DRBG_BLOCKSIZE;
- }
-
- return( 0 );
-}
-
-int ctr_drbg_update_internal( ctr_drbg_context *ctx,
- const unsigned char data[CTR_DRBG_SEEDLEN] )
-{
- unsigned char tmp[CTR_DRBG_SEEDLEN];
- unsigned char *p = tmp;
- int i, j;
-
- memset( tmp, 0, CTR_DRBG_SEEDLEN );
-
- for( j = 0; j < CTR_DRBG_SEEDLEN; j += CTR_DRBG_BLOCKSIZE )
- {
- /*
- * Increase counter
- */
- for( i = CTR_DRBG_BLOCKSIZE; i >= 0; i-- )
- if( ++ctx->counter[i - 1] != 0 )
- break;
-
- /*
- * Crypt counter block
- */
- aes_crypt_ecb( &ctx->aes_ctx, AES_ENCRYPT, ctx->counter, p );
-
- p += CTR_DRBG_BLOCKSIZE;
- }
-
- for( i = 0; i < CTR_DRBG_SEEDLEN; i++ )
- tmp[i] ^= data[i];
-
- /*
- * Update key and counter
- */
- aes_setkey_enc( &ctx->aes_ctx, tmp, CTR_DRBG_KEYBITS );
- memcpy( ctx->counter, tmp + CTR_DRBG_KEYSIZE, CTR_DRBG_BLOCKSIZE );
-
- return( 0 );
-}
-
-void ctr_drbg_update( ctr_drbg_context *ctx,
- const unsigned char *additional, size_t add_len )
-{
- unsigned char add_input[CTR_DRBG_SEEDLEN];
-
- if( add_len > 0 )
- {
- block_cipher_df( add_input, additional, add_len );
- ctr_drbg_update_internal( ctx, add_input );
- }
-}
-
-int ctr_drbg_reseed( ctr_drbg_context *ctx,
- const unsigned char *additional, size_t len )
-{
- unsigned char seed[CTR_DRBG_MAX_SEED_INPUT];
- size_t seedlen = 0;
-
- if( ctx->entropy_len + len > CTR_DRBG_MAX_SEED_INPUT )
- return( POLARSSL_ERR_CTR_DRBG_INPUT_TOO_BIG );
-
- memset( seed, 0, CTR_DRBG_MAX_SEED_INPUT );
-
- /*
- * Gather enropy_len bytes of entropy to seed state
- */
- if( 0 != ctx->f_entropy( ctx->p_entropy, seed,
- ctx->entropy_len ) )
- {
- return( POLARSSL_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED );
- }
-
- seedlen += ctx->entropy_len;
-
- /*
- * Add additional data
- */
- if( additional && len )
- {
- memcpy( seed + seedlen, additional, len );
- seedlen += len;
- }
-
- /*
- * Reduce to 384 bits
- */
- block_cipher_df( seed, seed, seedlen );
-
- /*
- * Update state
- */
- ctr_drbg_update_internal( ctx, seed );
- ctx->reseed_counter = 1;
-
- return( 0 );
-}
-
-int ctr_drbg_random_with_add( void *p_rng,
- unsigned char *output, size_t output_len,
- const unsigned char *additional, size_t add_len )
-{
- int ret = 0;
- ctr_drbg_context *ctx = (ctr_drbg_context *) p_rng;
- unsigned char add_input[CTR_DRBG_SEEDLEN];
- unsigned char *p = output;
- unsigned char tmp[CTR_DRBG_BLOCKSIZE];
- int i;
- size_t use_len;
-
- if( output_len > CTR_DRBG_MAX_REQUEST )
- return( POLARSSL_ERR_CTR_DRBG_REQUEST_TOO_BIG );
-
- if( add_len > CTR_DRBG_MAX_INPUT )
- return( POLARSSL_ERR_CTR_DRBG_INPUT_TOO_BIG );
-
- memset( add_input, 0, CTR_DRBG_SEEDLEN );
-
- if( ctx->reseed_counter > ctx->reseed_interval ||
- ctx->prediction_resistance )
- {
- if( ( ret = ctr_drbg_reseed( ctx, additional, add_len ) ) != 0 )
- return( ret );
-
- add_len = 0;
- }
-
- if( add_len > 0 )
- {
- block_cipher_df( add_input, additional, add_len );
- ctr_drbg_update_internal( ctx, add_input );
- }
-
- while( output_len > 0 )
- {
- /*
- * Increase counter
- */
- for( i = CTR_DRBG_BLOCKSIZE; i > 0; i-- )
- if( ++ctx->counter[i - 1] != 0 )
- break;
-
- /*
- * Crypt counter block
- */
- aes_crypt_ecb( &ctx->aes_ctx, AES_ENCRYPT, ctx->counter, tmp );
-
- use_len = (output_len > CTR_DRBG_BLOCKSIZE ) ? CTR_DRBG_BLOCKSIZE : output_len;
- /*
- * Copy random block to destination
- */
- memcpy( p, tmp, use_len );
- p += use_len;
- output_len -= use_len;
- }
-
- ctr_drbg_update_internal( ctx, add_input );
-
- ctx->reseed_counter++;
-
- return( 0 );
-}
-
-int ctr_drbg_random( void *p_rng, unsigned char *output, size_t output_len )
-{
- return ctr_drbg_random_with_add( p_rng, output, output_len, NULL, 0 );
-}
-
-#if defined(POLARSSL_FS_IO)
-int ctr_drbg_write_seed_file( ctr_drbg_context *ctx, const char *path )
-{
- int ret;
- FILE *f;
- unsigned char buf[ CTR_DRBG_MAX_INPUT ];
-
- if( ( f = fopen( path, "wb" ) ) == NULL )
- return( POLARSSL_ERR_CTR_DRBG_FILE_IO_ERROR );
-
- if( ( ret = ctr_drbg_random( ctx, buf, CTR_DRBG_MAX_INPUT ) ) != 0 )
- return( ret );
-
- if( fwrite( buf, 1, CTR_DRBG_MAX_INPUT, f ) != CTR_DRBG_MAX_INPUT )
- {
- fclose( f );
- return( POLARSSL_ERR_CTR_DRBG_FILE_IO_ERROR );
- }
-
- fclose( f );
- return( 0 );
-}
-
-int ctr_drbg_update_seed_file( ctr_drbg_context *ctx, const char *path )
-{
- FILE *f;
- size_t n;
- unsigned char buf[ CTR_DRBG_MAX_INPUT ];
-
- if( ( f = fopen( path, "rb" ) ) == NULL )
- return( POLARSSL_ERR_CTR_DRBG_FILE_IO_ERROR );
-
- fseek( f, 0, SEEK_END );
- n = (size_t) ftell( f );
- fseek( f, 0, SEEK_SET );
-
- if( n > CTR_DRBG_MAX_INPUT )
- return( POLARSSL_ERR_CTR_DRBG_INPUT_TOO_BIG );
-
- if( fread( buf, 1, n, f ) != n )
- {
- fclose( f );
- return( POLARSSL_ERR_CTR_DRBG_FILE_IO_ERROR );
- }
-
- ctr_drbg_update( ctx, buf, n );
-
- fclose( f );
-
- return( ctr_drbg_write_seed_file( ctx, path ) );
-}
-#endif /* POLARSSL_FS_IO */
-
-#if defined(POLARSSL_SELF_TEST)
-
-#include <stdio.h>
-
-unsigned char entropy_source_pr[96] =
- { 0xc1, 0x80, 0x81, 0xa6, 0x5d, 0x44, 0x02, 0x16,
- 0x19, 0xb3, 0xf1, 0x80, 0xb1, 0xc9, 0x20, 0x02,
- 0x6a, 0x54, 0x6f, 0x0c, 0x70, 0x81, 0x49, 0x8b,
- 0x6e, 0xa6, 0x62, 0x52, 0x6d, 0x51, 0xb1, 0xcb,
- 0x58, 0x3b, 0xfa, 0xd5, 0x37, 0x5f, 0xfb, 0xc9,
- 0xff, 0x46, 0xd2, 0x19, 0xc7, 0x22, 0x3e, 0x95,
- 0x45, 0x9d, 0x82, 0xe1, 0xe7, 0x22, 0x9f, 0x63,
- 0x31, 0x69, 0xd2, 0x6b, 0x57, 0x47, 0x4f, 0xa3,
- 0x37, 0xc9, 0x98, 0x1c, 0x0b, 0xfb, 0x91, 0x31,
- 0x4d, 0x55, 0xb9, 0xe9, 0x1c, 0x5a, 0x5e, 0xe4,
- 0x93, 0x92, 0xcf, 0xc5, 0x23, 0x12, 0xd5, 0x56,
- 0x2c, 0x4a, 0x6e, 0xff, 0xdc, 0x10, 0xd0, 0x68 };
-
-unsigned char entropy_source_nopr[64] =
- { 0x5a, 0x19, 0x4d, 0x5e, 0x2b, 0x31, 0x58, 0x14,
- 0x54, 0xde, 0xf6, 0x75, 0xfb, 0x79, 0x58, 0xfe,
- 0xc7, 0xdb, 0x87, 0x3e, 0x56, 0x89, 0xfc, 0x9d,
- 0x03, 0x21, 0x7c, 0x68, 0xd8, 0x03, 0x38, 0x20,
- 0xf9, 0xe6, 0x5e, 0x04, 0xd8, 0x56, 0xf3, 0xa9,
- 0xc4, 0x4a, 0x4c, 0xbd, 0xc1, 0xd0, 0x08, 0x46,
- 0xf5, 0x98, 0x3d, 0x77, 0x1c, 0x1b, 0x13, 0x7e,
- 0x4e, 0x0f, 0x9d, 0x8e, 0xf4, 0x09, 0xf9, 0x2e };
-
-unsigned char nonce_pers_pr[16] =
- { 0xd2, 0x54, 0xfc, 0xff, 0x02, 0x1e, 0x69, 0xd2,
- 0x29, 0xc9, 0xcf, 0xad, 0x85, 0xfa, 0x48, 0x6c };
-
-unsigned char nonce_pers_nopr[16] =
- { 0x1b, 0x54, 0xb8, 0xff, 0x06, 0x42, 0xbf, 0xf5,
- 0x21, 0xf1, 0x5c, 0x1c, 0x0b, 0x66, 0x5f, 0x3f };
-
-unsigned char result_pr[16] =
- { 0x34, 0x01, 0x16, 0x56, 0xb4, 0x29, 0x00, 0x8f,
- 0x35, 0x63, 0xec, 0xb5, 0xf2, 0x59, 0x07, 0x23 };
-
-unsigned char result_nopr[16] =
- { 0xa0, 0x54, 0x30, 0x3d, 0x8a, 0x7e, 0xa9, 0x88,
- 0x9d, 0x90, 0x3e, 0x07, 0x7c, 0x6f, 0x21, 0x8f };
-
-int test_offset;
-int ctr_drbg_self_test_entropy( void *data, unsigned char *buf, size_t len )
-{
- unsigned char *p = data;
- memcpy( buf, p + test_offset, len );
- test_offset += 32;
- return( 0 );
-}
-
-/*
- * 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 )
- printf( " CTR_DRBG (PR = TRUE) : " );
-
- test_offset = 0;
- if( ctr_drbg_init_entropy_len( &ctx, ctr_drbg_self_test_entropy, entropy_source_pr, nonce_pers_pr, 16, 32 ) != 0 )
- {
- if( verbose != 0 )
- printf( "failed\n" );
-
- return( 1 );
- }
- ctr_drbg_set_prediction_resistance( &ctx, CTR_DRBG_PR_ON );
-
- if( ctr_drbg_random( &ctx, buf, CTR_DRBG_BLOCKSIZE ) != 0 )
- {
- if( verbose != 0 )
- printf( "failed\n" );
-
- return( 1 );
- }
-
- if( ctr_drbg_random( &ctx, buf, CTR_DRBG_BLOCKSIZE ) != 0 )
- {
- if( verbose != 0 )
- printf( "failed\n" );
-
- return( 1 );
- }
-
- if( memcmp( buf, result_pr, CTR_DRBG_BLOCKSIZE ) != 0 )
- {
- if( verbose != 0 )
- printf( "failed\n" );
-
- return( 1 );
- }
-
- if( verbose != 0 )
- printf( "passed\n" );
-
- /*
- * Based on a NIST CTR_DRBG test vector (PR = FALSE)
- */
- if( verbose != 0 )
- printf( " CTR_DRBG (PR = FALSE): " );
-
- test_offset = 0;
- if( ctr_drbg_init_entropy_len( &ctx, ctr_drbg_self_test_entropy, entropy_source_nopr, nonce_pers_nopr, 16, 32 ) != 0 )
- {
- if( verbose != 0 )
- printf( "failed\n" );
-
- return( 1 );
- }
-
- if( ctr_drbg_random( &ctx, buf, 16 ) != 0 )
- {
- if( verbose != 0 )
- printf( "failed\n" );
-
- return( 1 );
- }
-
- if( ctr_drbg_reseed( &ctx, NULL, 0 ) != 0 )
- {
- if( verbose != 0 )
- printf( "failed\n" );
-
- return( 1 );
- }
-
- if( ctr_drbg_random( &ctx, buf, 16 ) != 0 )
- {
- if( verbose != 0 )
- printf( "failed\n" );
-
- return( 1 );
- }
-
- if( memcmp( buf, result_nopr, 16 ) != 0 )
- {
- if( verbose != 0 )
- printf( "failed\n" );
-
- return( 1 );
- }
-
- if( verbose != 0 )
- printf( "passed\n" );
-
- if( verbose != 0 )
- printf( "\n" );
-
- return( 0 );
-}
-#endif
-
-#endif