--- /dev/null
+/* rsassa_pkcs1v15.c */
+/*
+ This file is part of the ARM-Crypto-Lib.
+ Copyright (C) 2006-2012 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 <http://www.gnu.org/licenses/>.
+*/
+
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include "rsa_basic.h"
+#include "bigint.h"
+#include "rsassa_pkcs1v15.h"
+
+#include "cli.h"
+
+const uint8_t md5_prefix[] =
+{ 0x30, 0x20, 0x30, 0x0c, 0x06, 0x08, 0x2a, 0x86,
+ 0x48, 0x86, 0xf7, 0x0d, 0x02, 0x05, 0x05, 0x00,
+ 0x04, 0x10
+};
+
+const pkcs1v15_algo_prefix_t pkcs1v15_md5_prefix = {
+ 18, md5_prefix
+};
+
+const uint8_t sha1_prefix[] =
+{ 0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2b, 0x0e,
+ 0x03, 0x02, 0x1a, 0x05, 0x00, 0x04, 0x14
+};
+
+const pkcs1v15_algo_prefix_t pkcs1v15_sha1_prefix = {
+ 15, sha1_prefix
+};
+
+const uint8_t sha224_prefix[] =
+{ 0x30, 0x2d, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86,
+ 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x04, 0x05,
+ 0x00, 0x04, 0x1c
+};
+
+const pkcs1v15_algo_prefix_t pkcs1v15_sha224_prefix = {
+ 19, sha224_prefix
+};
+
+const uint8_t sha256_prefix[] =
+{ 0x30, 0x51, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86,
+ 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01, 0x05,
+ 0x00, 0x04, 0x20
+};
+
+const pkcs1v15_algo_prefix_t pkcs1v15_sha256_prefix = {
+ 19, sha256_prefix
+};
+
+const uint8_t sha384_prefix[] =
+{ 0x30, 0x51, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86,
+ 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x02, 0x05,
+ 0x00, 0x04, 0x30
+};
+
+const pkcs1v15_algo_prefix_t pkcs1v15_sha384_prefix = {
+ 19, sha384_prefix
+};
+
+const uint8_t sha512_prefix[] =
+{ 0x30, 0x51, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86,
+ 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x03, 0x05,
+ 0x00, 0x04, 0x40
+};
+
+const pkcs1v15_algo_prefix_t pkcs1v15_sha512_prefix = {
+ 19, sha512_prefix
+};
+/*
+
+MD2: (0x)30 20 30 0c 06 08 2a 86 48 86 f7 0d 02 02 05 00 04 10
+MD5: (0x)30 20 30 0c 06 08 2a 86 48 86 f7 0d 02 05 05 00 04 10
+SHA-1: (0x)30 21 30 09 06 05 2b 0e 03 02 1a 05 00 04 14
+SHA-224: (0x)30 2d 30 0d 06 09 60 86 48 01 65 03 04 02 04 05 00 04 1c
+SHA-256: (0x)30 51 30 0d 06 09 60 86 48 01 65 03 04 02 01 05 00 04 20
+SHA-384: (0x)30 51 30 0d 06 09 60 86 48 01 65 03 04 02 02 05 00 04 30
+SHA-512: (0x)30 51 30 0d 06 09 60 86 48 01 65 03 04 02 03 05 00 04 40
+
+*/
+
+static
+uint8_t emsa_pkcs1v15_encode(void* dest, uint16_t dest_length_B, const void* hash,
+ uint16_t hash_length_B, const pkcs1v15_algo_prefix_t* algo_prefix){
+ uint16_t ps_length;
+
+ if(dest_length_B < algo_prefix->length + hash_length_B + 3 + 8){
+ return 1;
+ }
+ ps_length = dest_length_B - (algo_prefix->length + hash_length_B + 3);
+ ((uint8_t*)dest)[0] = 0x00;
+ ((uint8_t*)dest)[1] = 0x01;
+ ((uint8_t*)dest)[2 + ps_length] = 0x00;
+ memset((uint8_t*)dest + 2, 0xff, ps_length);
+ memcpy((uint8_t*)dest + 3 + ps_length, algo_prefix->data, algo_prefix->length);
+ memcpy((uint8_t*)dest + 3 + ps_length + algo_prefix->length, hash, hash_length_B);
+ return 0;
+}
+
+uint8_t rsa_sign_pkcs1v15(void* dest, uint16_t* out_length_B, const void* hash,
+ uint16_t hash_length_B, const rsa_privatekey_t* key,
+ const pkcs1v15_algo_prefix_t* algo_prefix){
+ uint8_t r;
+ uint16_t modulus_length;
+ bigint_t x;
+ modulus_length = bigint_get_first_set_bit(&key->modulus) / 8 + 1;
+ r = emsa_pkcs1v15_encode(dest, modulus_length, hash, hash_length_B, algo_prefix);
+ if(r){
+ return r;
+ }
+ x.wordv = dest;
+ rsa_os2ip(&x, NULL, modulus_length);
+ rsa_dec(&x, key);
+ rsa_i2osp(NULL, &x, out_length_B);
+
+ return 0;
+}
+
+
+uint8_t rsa_verify_pkcs1v15(const void* signature, uint16_t signature_length_B,
+ const void* hash, uint16_t hash_length_B, const rsa_publickey_t* key,
+ const pkcs1v15_algo_prefix_t* algo_prefix){
+ uint16_t modulus_length;
+ uint16_t signature_em_length, ps_length;
+ bigint_t x;
+
+ modulus_length = bigint_get_first_set_bit(&key->modulus) / 8 + 1;
+#if PREFERE_HEAP
+ uint8_t *buffer;
+ buffer = malloc(bigint_length_B(&key->modulus));
+ if(!buffer){
+ return 0x80;
+ }
+#else
+ uint8_t buffer[bigint_length_B(&key->modulus)];
+#endif
+/*
+ cli_putstr("\r\nDBG: signature_length_B: 0x");
+ cli_hexdump_rev(&signature_length_B, 2);
+ cli_putstr("\r\nDBG: modulus_length_B: 0x");
+ cli_hexdump_rev(&modulus_length, 2);
+*/
+ x.wordv = (bigint_word_t*)buffer;
+ rsa_os2ip(&x, signature, signature_length_B);
+ rsa_enc(&x, key);
+ rsa_i2osp(NULL, &x, &signature_em_length);
+/*
+ cli_putstr("\r\nDBG: signature_em_length_B: 0x");
+ cli_hexdump_rev(&signature_em_length, 2);
+*/
+ if(signature_em_length + 1 != modulus_length){
+ return 1;
+ }
+ if(memcmp(buffer + modulus_length - hash_length_B - 1, hash, hash_length_B)){
+ return 2;
+ }
+ ps_length = modulus_length - (algo_prefix->length + hash_length_B + 3);
+ if((int16_t)ps_length < 8){
+ return 3;
+ }
+ if(memcmp(buffer + 2 + ps_length, algo_prefix->data, algo_prefix->length)){
+ return 4;
+ }
+ if(buffer[0] != 1){
+ return 6;
+ }
+ if(buffer[1 + ps_length] != 0){
+ return 7;
+ }
+ do{
+ if(buffer[ps_length] != 0xff){
+ return 8;
+ }
+ }while(--ps_length);
+#if PREFERE_HEAP
+ free(buffer);
+#endif
+
+ return 0;
+}
projects / arm-crypto-lib.git / blobdiff