diff options
Diffstat (limited to 'src/tspi/daa/big_integer/bi.c')
| -rw-r--r-- | src/tspi/daa/big_integer/bi.c | 237 |
1 files changed, 237 insertions, 0 deletions
diff --git a/src/tspi/daa/big_integer/bi.c b/src/tspi/daa/big_integer/bi.c new file mode 100644 index 0000000..b86b2c1 --- /dev/null +++ b/src/tspi/daa/big_integer/bi.c @@ -0,0 +1,237 @@ + +/* + * Licensed Materials - Property of IBM + * + * trousers - An open source TCG Software Stack + * + * (C) Copyright International Business Machines Corp. 2006 + * + */ + +#include <bi.h> + +#include "tcslog.h" + +#undef INLINE_DECL +#define INLINE_DECL + +/*********************************************************************************** + CONSTANT +*************************************************************************************/ + +bi_t bi_0; +bi_t bi_1; +bi_t bi_2; + +/*********************************************************************************** + WORK VARIABLE +*************************************************************************************/ + +// Buffer to load bi from a file . A static field is used, this should not be +// refere in any SPI calls. +#define BUFFER_SIZE 10000 +static char buffer[BUFFER_SIZE]; // used for loading bi + +#define SAFETY_PARAM 80 + +// keep the list of allocated memory, usually used for the format functions +list_ptr allocs = NULL; + +/*********************************************************************************** + DUMP LIB +*************************************************************************************/ + +// !! to use only for debugging +// do not used it in the same call, as a static buffer is used +char *dump_byte_array(int len, unsigned char *array) { + int i, j=0; + char c, str[3]; + + for( i=0; i<len; i++) { + c = array[i]; + sprintf( str, "%02X", (int)(c & 0xFF)); + buffer[j] = str[0]; + buffer[j+1] = str[1]; + j+=2; + } + buffer[j] = 0; + return buffer; +} + +/* convert <strings> and return it into a byte array <result> of length <length> */ +unsigned char *retrieve_byte_array( int *len, const char *strings) { + int index_str = 0, index_result = 0; + int str_len = strlen( strings); + char read_buffer[3]; + int c; + unsigned char *result; + + read_buffer[2]=0; + *len = ( str_len >> 1); + #ifdef BI_DEBUG + printf("[%s]\n", strings); + printf("[retrieve_byte_array] strlen=%d len=%d\n", str_len, *len); + #endif + result = (unsigned char *)malloc( *len+1); + if( result == NULL) { + LogError("malloc of %d bytes failed", *len+1); + return NULL; + } + if( (str_len & 1) ==1) { + // impair => 1 12 23 -> 01 12 23 + read_buffer[0]='0'; + read_buffer[1]=strings[index_str++]; + sscanf( read_buffer, "%2X", &c); + #ifdef BI_DEBUG + printf("[c'=%2X|%s]", (int)(c & 0xFF), read_buffer); + #endif + result[index_result++] = c&0xFF; + (*len)++; + } + while( index_str < str_len) { + read_buffer[0] = strings[ index_str++]; + read_buffer[1] = strings[ index_str++]; + sscanf( read_buffer, "%02X", &c); + #ifdef BI_DEBUG + printf("[c'=%2X|%s]", (int)(c & 0xFF), read_buffer); + #endif + result[index_result++] = c&0xFF; + } + return result; +} + +/* create a <big integer> array */ +INLINE_DECL void bi_new_array( bi_array array, const int length) { + int i=0; + + bi_new_array2( array, length); + if( array->array == NULL) return; + for( i = 0; i< length; i++) { + array->array[i] = bi_new_ptr(); + } +} + +/* create a <big integer> array */ +INLINE_DECL void bi_new_array2( bi_array array, const int length) { + array->length = length; + array->array = (bi_ptr *)malloc( sizeof(bi_ptr) * length); + if( array->array == NULL) { + LogError("malloc of %d bytes failed", sizeof(bi_ptr)*length); + return; + } +} + +/* free resources allocated to the big integer <i> */ +INLINE_DECL void bi_free_array(bi_array array) { + int length = array->length; + int i=0; + + for( i = 0; i< length; i++) { + bi_free_ptr( array->array[i]); + } + free( array->array); +} + +/* copy length pointers from the array <src, offset_src> to array <dest, offset_dest> */ +INLINE_DECL void bi_copy_array(bi_array_ptr src, + int offset_src, + bi_array_ptr dest, + int offset_dest, + int length) { + int i=0; + + for( i = 0; i< length; i++) { + dest->array[ offset_dest + i] = src->array[ offset_src + i]; + } +} + +/* debug function -> dump a field of type bi_array */ +void dump_bi_array( char *field, const bi_array_ptr array) { + int i; + + for( i=0; i<array->length; i++) { + printf("%s->array[%d] = %s\n", field, i, bi_2_hex_char(array->array[i])); + } +} + +/*********************************************************************************** + SAFE RANDOM +*************************************************************************************/ + +/* Returns a random number in the range of [0,element-1] */ +bi_ptr compute_random_number( bi_ptr result, const bi_ptr element) { + bi_urandom( result, bi_length( element) + SAFETY_PARAM); + bi_mod( result, result, element); + return result; +} + +/*********************************************************************************** + SAVE / LOAD +*************************************************************************************/ + +/* load an big integer from an open file handler */ +void bi_load( bi_ptr bi, FILE *file) { + int i=0; + char c; + + fgets( buffer, BUFFER_SIZE, file); + do { + c = buffer[i]; + i++; + } while( c != 0 && c != ' '); + buffer[i-1] = 0; + bi_set_as_hex( bi, buffer); +} + +/* load an big integer array from an open file handler */ +void bi_load_array( bi_array_ptr array, FILE *file) { + int i, j = 0, length; + char c; + + fgets( buffer, BUFFER_SIZE, file); + do { + c = buffer[ j]; + j++; + } while( c != 0 && c != ' '); + buffer[ j -1] = 0; + sscanf( buffer, "%d", &length); + bi_new_array( array, length); + for( i=0; i<array->length; i++) { + bi_load( array->array[i], file); + } +} + +/* save an big integer to an open file handler */ +void bi_save( const bi_ptr bi, const char *name, FILE *file) { + fprintf( file, "%s # %s [%ld]\n", bi_2_hex_char( bi), name, bi_nbin_size( bi)); +} + +/* save an big integer array to an open file handler */ +void bi_save_array( const bi_array_ptr array, const char *name, FILE *file) { + int i; + char new_name[100]; + + fprintf(file, "%d # %s.length\n", array->length, name); + for( i=0; i<array->length; i++) { + sprintf( new_name, "%s[%d]", name, i); + bi_save( array->array[i], new_name, file); + } +} + +/* convert <bi> to a byte array of length result, the beginning of */ +/* this buffer is feel with '0' if needed */ +void bi_2_byte_array( unsigned char *result, int length, bi_ptr bi) { + int i, result_length; + + bi_2_nbin1( &result_length, buffer, bi); + int delta = length - result_length; + #ifdef BI_DEBUG + fprintf( stderr, "[bi_2_byte_array] result_length=%d length=%d\n", result_length, length); + #endif + if( delta < 0) { + LogError( "[bi_2_byte_array] asked length:%d found:%d\n", length, result_length); + return; + } + for( i=0; i<delta; i++) result[i] = 0; + for( ; i<length; i++) result[ i] = buffer[ i - delta]; +} |