78 lines
2.2 KiB
C
78 lines
2.2 KiB
C
/* rsa_basic.c */
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/*
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This file is part of the ARM-Crypto-Lib.
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Copyright (C) 2006-2011 Daniel Otte (daniel.otte@rub.de)
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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 3 of the License, or
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(at your option) any later version.
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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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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include "bigint.h"
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#include "rsa_basic.h"
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#include "cli.h"
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void rsa_enc(bigint_t* data, rsa_publickey_t* key){
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bigint_expmod_u(data, data, key->exponent, key->modulus);
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}
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void rsa_dec(bigint_t* data, rsa_privatekey_t* key){
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bigint_expmod_u(data, data, key->exponent, key->modulus);
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}
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void rsa_os2ip(bigint_t* dest, const void* data, uint32_t length_B){
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uint8_t off;
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off = length_B % sizeof(bigint_word_t);
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if(!data){
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if(off){
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dest->wordv = realloc(dest->wordv, length_B + sizeof(bigint_word_t) - off);
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memmove((uint8_t*)dest->wordv+off, dest->wordv, length_B);
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memset(dest->wordv, 0, off);
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}
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}else{
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if(off){
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memcpy((uint8_t*)dest->wordv + off, data, length_B);
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memset(dest, 0, off);
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}else{
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memcpy(dest->wordv, data, length_B);
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}
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}
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dest->length_B = (length_B + sizeof(bigint_word_t) - 1) / sizeof(bigint_word_t);
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bigint_changeendianess(dest);
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bigint_adjust(dest);
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}
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void rsa_i2osp(void* dest, bigint_t* src, uint16_t* out_length_B){
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*out_length_B = bigint_get_first_set_bit(src) / 8 + 1;
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if(dest){
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uint16_t i;
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for(i=*out_length_B; i>0; --i){
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*((uint8_t*)dest) = ((uint8_t*)src->wordv)[i-1];
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dest = (uint8_t*)dest + 1;
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}
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}else{
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uint8_t off;
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bigint_changeendianess(src);
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bigint_adjust(src);
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off = bigint_get_last_set_bit(src)/8;
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if(off){
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memmove(src->wordv, (uint8_t*)src->wordv+off, *out_length_B);
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}
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}
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}
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