/* rsa_pkcs15.c */
/*
This file is part of the ARM-Crypto-Lib.
Copyright (C) 2006-2011 Daniel Otte (daniel.otte@rub.de)
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 3 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, see .
*/
#include
#include
#include
#include "bigint.h"
#include "rsa_basic.h"
#include "bigint_io.h"
#include "cli.h"
#include "random_dummy.h"
uint8_t rsa_encrypt_pkcs15(void* dest, uint16_t* out_length, const void* src,
uint16_t length_B, rsa_publickey_t* key, const void* pad){
int16_t pad_length;
bigint_t x;
pad_length = (bigint_get_first_set_bit(key->modulus) + 7) / 8 - length_B - 3;
if(pad_length<8){
cli_putstr("\r\nERROR: pad_length<8; pad_length: ");
cli_hexdump_rev(&pad_length, 2);
return 2; /* message to long */
}
if(!pad){
uint16_t i;
uint8_t c;
for(i=0; i=m_length){
return 1;
}
++idx;
while(((uint8_t*)x.wordv)[idx+pad_length]!=0 && (idx+pad_length)=m_length){
return 2;
}
*out_length = m_length - idx - pad_length - 1;
memcpy(dest, ((uint8_t*)x.wordv) + idx + pad_length + 1, m_length - idx - pad_length - 1);
if(pad){
memcpy(pad, ((uint8_t*)x.wordv)+idx, pad_length);
}
return 0;
}