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+gcm128

This commit is contained in:
bg nerilex 2015-01-22 02:03:49 +01:00
parent deca11a7e7
commit e542ff92d0
4 changed files with 766 additions and 0 deletions
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/* gcm128.c */
/*
This file is part of the AVR-Crypto-Lib.
Copyright (C) 2006-2015 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 <inttypes.h>
#include <stdlib.h>
#include <string.h>
#include <memxor.h>
#include <blockcipher_descriptor.h>
#include <bcal-basic.h>
#include <gcm128.h>
#include <stdio.h>
#include <cli.h>
#include <uart.h>
#define DUMP_LEN_LINE(x, len, line) do { \
printf("\n\n (DBG <" __FILE__ " %s " #line ">)" #x ":", __func__); \
cli_hexdump_block((x), (len), 4, 16); \
uart0_flush(); } while (0)
#define DUMP_dummy(x, len, v) DUMP_LEN_LINE(x, len, v)
#define DUMP_LEN(x, len) DUMP_dummy(x, len, __LINE__)
#define DUMP(x) DUMP_LEN(x, sizeof(x))
#define BLOCK_BYTES GCM128_BLOCK_BYTES
#define BLOCK_BITS GCM128_BLOCK_BITS
#define COUNT_BYTES GCM128_COUNT_BYTES
#define COUNT_BITS GCM128_COUNT_BITS
#define POLY_BYTE 0xE1
static uint8_t shift_block_right(void *a)
{
uint8_t c1 = 0, c2;
uint8_t i = BLOCK_BYTES;
uint8_t *p = a;
do {
c2 = *p & 1;
*p = (*p >> 1) | c1;
p++;
c1 = c2 ? 0x80 : 0;
} while (--i);
return c2;
}
static void gmul128(
void *dest,
const void *a,
const void *b)
{
uint8_t c, v[BLOCK_BYTES], t, dummy[BLOCK_BYTES + 1], *(lut[2]);
const uint8_t *x = b;
uint8_t i, j;
memset(dest, 0, BLOCK_BYTES);
memset(dummy, 0, BLOCK_BYTES);
dummy[BLOCK_BYTES] = POLY_BYTE;
memcpy(v, a, BLOCK_BYTES);
lut[0] = dummy;
lut[1] = v;
i = BLOCK_BYTES;
do {
j = 8;
t = *x++;
do {
memxor(dest, lut[t >> 7], BLOCK_BYTES);
t <<= 1;
c = shift_block_right(v);
v[0] ^= dummy[15 + c];
} while (--j);
} while (--i);
}
static void ghash128_init(ghash128_ctx_t *ctx)
{
memset(ctx->tag, 0, 16);
}
static void ghash128_block(
ghash128_ctx_t *ctx,
const void *block)
{
uint8_t tmp[BLOCK_BYTES];
memcpy(tmp, ctx->tag, BLOCK_BYTES);
memxor(tmp, block, BLOCK_BYTES);
gmul128(ctx->tag, tmp, ctx->key);
}
static void inc32(void *a)
{
uint8_t c, *p = a;
c = (p[3]++ == 0);
c &= ((p[2] += c) == 0);
c &= ((p[1] += c) == 0);
p[0] +=c;
}
int8_t gcm128_init(
gcm128_ctx_t *ctx,
const bcdesc_t *cipher,
const void *key,
uint16_t key_length_b,
const void *iv,
uint16_t iv_length_b)
{
uint8_t r;
uint8_t tmp[BLOCK_BYTES];
if (bcal_cipher_getBlocksize_b(cipher) != BLOCK_BITS) {
return -1;
}
if ((r = bcal_cipher_init(cipher, key, key_length_b, &ctx->cipher_ctx))) {
printf_P(PSTR("Error: return code: %"PRId8" key length: %"PRId16" <%s %s %d>\n"), r, key_length_b, __FILE__, __func__, __LINE__);
uart0_flush();
return -2;
}
memset(ctx->ghash_ctx.key, 0, BLOCK_BYTES);
bcal_cipher_enc(ctx->ghash_ctx.key, &ctx->cipher_ctx);
ghash128_init(&ctx->ghash_ctx);
if (iv_length_b == BLOCK_BITS - COUNT_BITS) {
memcpy(ctx->ctr, iv, (BLOCK_BITS - COUNT_BITS) / 8);
memset(&ctx->ctr[BLOCK_BYTES - COUNT_BYTES], 0, COUNT_BYTES - 1);
ctx->ctr[BLOCK_BYTES - 1] = 1;
} else {
uint16_t ctr = iv_length_b / BLOCK_BITS;
while (ctr--)
{
ghash128_block(&ctx->ghash_ctx, iv);
iv = &((uint8_t*)iv)[BLOCK_BYTES];
}
memset(tmp, 0, BLOCK_BYTES);
memcpy(tmp, iv, (iv_length_b % BLOCK_BITS + 7) / 8);
if (iv_length_b & 7) {
tmp[(iv_length_b % BLOCK_BITS) / 8] &= 0xff << (8 - (iv_length_b & 7));
}
ghash128_block(&ctx->ghash_ctx, tmp);
memset(tmp, 0, BLOCK_BYTES);
tmp[BLOCK_BYTES - 2] = iv_length_b >> 8;
tmp[BLOCK_BYTES - 1] = iv_length_b & 0xff;
ghash128_block(&ctx->ghash_ctx, tmp);
memcpy(ctx->ctr, ctx->ghash_ctx.tag, BLOCK_BYTES);
ghash128_init(&ctx->ghash_ctx);
}
memcpy(ctx->j0, &ctx->ctr[BLOCK_BYTES - COUNT_BYTES], COUNT_BYTES);
ctx->length_a = 0;
ctx->length_c = 0;
return 0;
}
void gcm128_add_ad_block(
gcm128_ctx_t *ctx,
const void *block )
{
ghash128_block(&ctx->ghash_ctx, block);
ctx->length_a += BLOCK_BITS;
}
void gcm128_add_ad_final_block(
gcm128_ctx_t *ctx,
const void *block,
uint16_t length_b )
{
uint8_t tmp[BLOCK_BYTES];
while (length_b >= BLOCK_BITS)
{
gcm128_add_ad_block(ctx, block);
length_b -= BLOCK_BITS;
block = &((uint8_t*)block)[BLOCK_BYTES];
}
if (length_b > 0) {
memset(tmp, 0, BLOCK_BYTES);
memcpy(tmp, block, (length_b + 7) / 8);
if (length_b & 7) {
tmp[length_b / 8] &= 0xff << (8 - (length_b & 7));
}
ghash128_block(&ctx->ghash_ctx, tmp);
ctx->length_a += length_b;
}
}
void gcm128_encrypt_block(
gcm128_ctx_t *ctx,
void *dest,
const void *src)
{
uint8_t tmp[BLOCK_BYTES];
inc32(&ctx->ctr[BLOCK_BYTES - COUNT_BYTES]);
memcpy(tmp, ctx->ctr, BLOCK_BYTES);
bcal_cipher_enc(tmp, &ctx->cipher_ctx);
memxor(tmp, src, BLOCK_BYTES);
ghash128_block(&ctx->ghash_ctx, tmp);
ctx->length_c += BLOCK_BITS;
if (dest) {
memcpy(dest, tmp, BLOCK_BYTES);
}
}
void gcm128_encrypt_final_block(
gcm128_ctx_t *ctx,
void *dest,
const void *src,
uint16_t length_b
)
{
uint8_t tmp[BLOCK_BYTES];
while (length_b >= BLOCK_BITS) {
gcm128_encrypt_block(ctx, dest, src);
length_b -= BLOCK_BITS;
if (dest) {
dest = &((uint8_t*)dest)[BLOCK_BYTES];
}
src = &((uint8_t*)src)[BLOCK_BYTES];
}
if (length_b > 0) {
inc32(&ctx->ctr[BLOCK_BYTES - COUNT_BYTES]);
memcpy(tmp, ctx->ctr, BLOCK_BYTES);
bcal_cipher_enc(tmp, &ctx->cipher_ctx);
memxor(tmp, src, BLOCK_BYTES);
memset(&tmp[(length_b + 7) / 8], 0, BLOCK_BYTES - (length_b + 7) / 8);
if (length_b & 7) {
tmp[length_b / 8] &= 0xff << (8 - (length_b & 7));
}
ghash128_block(&ctx->ghash_ctx, tmp);
ctx->length_c += length_b;
if (dest) {
memcpy(dest, tmp, (length_b + 7) / 8);
}
}
}
void gcm128_decrypt_block(
gcm128_ctx_t *ctx,
void *dest,
const void *src)
{
uint8_t tmp[BLOCK_BYTES];
ghash128_block(&ctx->ghash_ctx, src);
inc32(&ctx->ctr[11]);
memcpy(tmp, ctx->ctr, BLOCK_BYTES);
bcal_cipher_enc(tmp, &ctx->cipher_ctx);
memxor(tmp, src, BLOCK_BYTES);
ctx->length_c += BLOCK_BITS;
if (dest) {
memcpy(dest, tmp, BLOCK_BYTES);
}
}
void gcm128_decrypt_final_block(
gcm128_ctx_t *ctx,
void *dest,
const void *src,
uint16_t length_b)
{
uint8_t tmp[BLOCK_BYTES];
while (length_b > BLOCK_BITS) {
gcm128_decrypt_block(ctx, dest, src);
length_b -= BLOCK_BITS;
if (dest) {
dest = &((uint8_t*)dest)[BLOCK_BYTES];
}
src = &((uint8_t*)src)[BLOCK_BYTES];
}
if (length_b > 0) {
memcpy(tmp, src, (length_b + 7) / 8);
memset(&tmp[(length_b + 7) / 8], 0, BLOCK_BYTES - (length_b + 7) / 8);
if (length_b & 7) {
tmp[length_b / 8] &= 0xff << (8 - (length_b & 7));
}
ghash128_block(&ctx->ghash_ctx, tmp);
inc32(&ctx->ctr[11]);
memcpy(tmp, ctx->ctr, BLOCK_BYTES);
bcal_cipher_enc(tmp, &ctx->cipher_ctx);
memxor(tmp, src, BLOCK_BYTES);
memset(&tmp[(length_b + 7) / 8], 0, BLOCK_BYTES - (length_b + 7) / 8);
if (length_b & 7) {
tmp[length_b / 8] &= 0xff << (8 - (length_b & 7));
}
ctx->length_c += length_b;
if (dest) {
memcpy(dest, tmp, (length_b + 7) / 8);
}
}
}
void gcm128_finalize(gcm128_ctx_t *ctx, void *tag, uint16_t tag_length_b)
{
uint8_t tmp[BLOCK_BYTES];
memset(tmp, 0, BLOCK_BYTES);
tmp[4] = ctx->length_a >> 24;
tmp[5] = ctx->length_a >> 16;
tmp[6] = ctx->length_a >> 8;
tmp[7] = ctx->length_a;
tmp[12] = ctx->length_c >> 24;
tmp[13] = ctx->length_c >> 16;
tmp[14] = ctx->length_c >> 8;
tmp[15] = ctx->length_c;
ghash128_block(&ctx->ghash_ctx, tmp);
memcpy(tmp, ctx->ctr, BLOCK_BYTES - COUNT_BYTES);
memcpy(&tmp[BLOCK_BYTES - COUNT_BYTES], ctx->j0, COUNT_BYTES);
bcal_cipher_enc(tmp, &ctx->cipher_ctx);
bcal_cipher_free(&ctx->cipher_ctx);
memxor(tmp, ctx->ghash_ctx.tag, BLOCK_BYTES);
if (tag_length_b > BLOCK_BITS) {
tag_length_b = BLOCK_BITS;
}
if (tag_length_b & 7) {
tmp[tag_length_b / 8] &= 0xff << (8 - (tag_length_b & 7));
}
if (tag) {
memcpy(tag, tmp, (tag_length_b + 7) / 8);
}
}

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/* gcm128.h */
/*
This file is part of the AVR-Crypto-Lib.
Copyright (C) 2015 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/>.
*/
#ifndef GCM_GCM128_H_
#define GCM_GCM128_H_
/* gcm128.c */
/*
This file is part of the AVR-Crypto-Lib.
Copyright (C) 2006-2015 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 <inttypes.h>
#include <stdlib.h>
#include <string.h>
#include <memxor.h>
#include <blockcipher_descriptor.h>
#include <gcm128.h>
#define GCM128_BLOCK_BYTES 16
#define GCM128_BLOCK_BITS (GCM128_BLOCK_BYTES * 8)
#define GCM128_COUNT_BYTES 4
#define GCM128_COUNT_BITS (GCM128_COUNT_BYTES * 8)
typedef struct {
uint8_t tag[GCM128_BLOCK_BYTES];
uint8_t key[GCM128_BLOCK_BYTES];
} ghash128_ctx_t;
typedef struct {
ghash128_ctx_t ghash_ctx;
bcgen_ctx_t cipher_ctx;
uint8_t ctr[GCM128_BLOCK_BYTES];
uint8_t j0[GCM128_COUNT_BYTES];
uint32_t length_a;
uint32_t length_c;
} gcm128_ctx_t;
int8_t gcm128_init(
gcm128_ctx_t *ctx,
const bcdesc_t *cipher,
const void *key,
uint16_t key_length_b,
const void *iv,
uint16_t iv_length_b);
void gcm128_add_ad_block(
gcm128_ctx_t *ctx,
const void *block );
void gcm128_add_ad_final_block(
gcm128_ctx_t *ctx,
const void *block,
uint16_t length_b );
void gcm128_encrypt_block(
gcm128_ctx_t *ctx,
void *dest,
const void *src);
void gcm128_encrypt_final_block(
gcm128_ctx_t *ctx,
void *dest,
const void *src,
uint16_t length_b);
void gcm128_decrypt_block(
gcm128_ctx_t *ctx,
void *dest,
const void *src);
void gcm128_decrypt_final_block(
gcm128_ctx_t *ctx,
void *dest,
const void *src,
uint16_t length_b);
void gcm128_finalize(
gcm128_ctx_t *ctx,
void *tag,
uint16_t tag_length_b);
#endif /* GCM_GCM128_H_ */

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# Makefile for AES
ALGO_NAME := GCM
# comment out the following line for removement of AES from the build process
BLOCK_CIPHERS += $(ALGO_NAME)
$(ALGO_NAME)_DIR := gcm/
$(ALGO_NAME)_INCDIR := memxor/ aes/ gf256mul/ bcal/
$(ALGO_NAME)_OBJ := gcm128.o \
aes_enc-asm.o aes_dec-asm.o aes_sbox-asm.o aes_invsbox-asm.o \
aes_keyschedule-asm.o
$(ALGO_NAME)_TESTBIN := main-gcm-test.o $(CLI_STD) $(BCAL_STD) \
bcal_aes128.o bcal_aes192.o bcal_aes256.o \
dump-asm.o dump-decl.o \
memxor.o
$(ALGO_NAME)_NESSIE_TEST := test nessie
$(ALGO_NAME)_PERFORMANCE_TEST := performance

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/* main-gcm-test.c */
/*
This file is part of the AVR-Crypto-Lib.
Copyright (C) 2006-2014 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/>.
*/
/*
* GCM test-suit
*
*/
#include "main-test-common.h"
#include <gcm128.h>
#include <bcal_aes128.h>
#include <bcal_aes192.h>
#include <bcal_aes256.h>
#include "performance_test.h"
char *algo_name = "GCM-AES128";
/*****************************************************************************
* additional validation-functions *
*****************************************************************************/
#define DUMP_LEN(x, len) do { printf("%s", "\n\n" #x ":"); \
cli_hexdump_block((x), (len), 4, 16); } while (0)
#define DUMP(x) DUMP_LEN(x, sizeof(x))
#define elementsof(t) (sizeof(t) / sizeof(t[0]))
/*****************************************************************************
* *
*****************************************************************************/
const uint8_t zero_block[] PROGMEM = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
const uint8_t key_b[] PROGMEM = {
0xfe, 0xff, 0xe9, 0x92, 0x86, 0x65, 0x73, 0x1c,
0x6d, 0x6a, 0x8f, 0x94, 0x67, 0x30, 0x83, 0x08,
0xfe, 0xff, 0xe9, 0x92, 0x86, 0x65, 0x73, 0x1c,
0x6d, 0x6a, 0x8f, 0x94, 0x67, 0x30, 0x83, 0x08
};
const uint8_t ad_block[] PROGMEM = {
0xfe, 0xed, 0xfa, 0xce, 0xde, 0xad, 0xbe, 0xef,
0xfe, 0xed, 0xfa, 0xce, 0xde, 0xad, 0xbe, 0xef,
0xab, 0xad, 0xda, 0xd2
};
const uint8_t pt_block[] PROGMEM = {
0xd9, 0x31, 0x32, 0x25, 0xf8, 0x84, 0x06, 0xe5,
0xa5, 0x59, 0x09, 0xc5, 0xaf, 0xf5, 0x26, 0x9a,
0x86, 0xa7, 0xa9, 0x53, 0x15, 0x34, 0xf7, 0xda,
0x2e, 0x4c, 0x30, 0x3d, 0x8a, 0x31, 0x8a, 0x72,
0x1c, 0x3c, 0x0c, 0x95, 0x95, 0x68, 0x09, 0x53,
0x2f, 0xcf, 0x0e, 0x24, 0x49, 0xa6, 0xb5, 0x25,
0xb1, 0x6a, 0xed, 0xf5, 0xaa, 0x0d, 0xe6, 0x57,
0xba, 0x63, 0x7b, 0x39, 0x1a, 0xaf, 0xd2, 0x55
};
/*****************************************************************************/
const uint8_t iv_block[] PROGMEM = {
0xca, 0xfe, 0xba, 0xbe, 0xfa, 0xce, 0xdb, 0xad,
0xde, 0xca, 0xf8, 0x88
};
/*****************************************************************************/
const uint8_t iv_6[] PROGMEM = {
0x93, 0x13, 0x22, 0x5d, 0xf8, 0x84, 0x06, 0xe5,
0x55, 0x90, 0x9c, 0x5a, 0xff, 0x52, 0x69, 0xaa,
0x6a, 0x7a, 0x95, 0x38, 0x53, 0x4f, 0x7d, 0xa1,
0xe4, 0xc3, 0x03, 0xd2, 0xa3, 0x18, 0xa7, 0x28,
0xc3, 0xc0, 0xc9, 0x51, 0x56, 0x80, 0x95, 0x39,
0xfc, 0xf0, 0xe2, 0x42, 0x9a, 0x6b, 0x52, 0x54,
0x16, 0xae, 0xdb, 0xf5, 0xa0, 0xde, 0x6a, 0x57,
0xa6, 0x37, 0xb3, 0x9b
};
typedef struct {
const void *key;
uint16_t key_length_b;
const void *iv;
uint16_t iv_length_b;
const void *ad;
uint16_t ad_length_b;
const void *pt;
uint16_t pt_length_b;
} test_t;
const test_t test_set[] PROGMEM = {
{ zero_block, 128, zero_block, 96, NULL, 0, NULL, 0 },
{ zero_block, 128, zero_block, 96, NULL, 0, zero_block, 128 },
{ key_b, 128, iv_block, 96, NULL, 0, pt_block, 512 },
{ key_b, 128, iv_block, 96, ad_block, 160, pt_block, 480 },
{ key_b, 128, iv_block, 64, ad_block, 160, pt_block, 480 },
{ key_b, 128, iv_6, sizeof(iv_6) * 8, ad_block, 160, pt_block, 480 },
{ zero_block, 192, zero_block, 96, NULL, 0, NULL, 0 },
{ zero_block, 192, zero_block, 96, NULL, 0, zero_block, 128 },
{ key_b, 192, iv_block, 96, NULL, 0, pt_block, 512 },
{ key_b, 192, iv_block, 96, ad_block, 160, pt_block, 480 },
{ key_b, 192, iv_block, 64, ad_block, 160, pt_block, 480 },
{ key_b, 192, iv_6, sizeof(iv_6) * 8, ad_block, 160, pt_block, 480 },
{ zero_block, 256, zero_block, 96, NULL, 0, NULL, 0 },
{ zero_block, 256, zero_block, 96, NULL, 0, zero_block, 128 },
{ key_b, 256, iv_block, 96, NULL, 0, pt_block, 512 },
{ key_b, 256, iv_block, 96, ad_block, 160, pt_block, 480 },
{ key_b, 256, iv_block, 64, ad_block, 160, pt_block, 480 },
{ key_b, 256, iv_6, sizeof(iv_6) * 8, ad_block, 160, pt_block, 480 },
};
/*****************************************************************************
* *
*****************************************************************************/
int8_t gcm128_simple(
const void *key,
const void *iv,
uint16_t iv_length_b,
const void * ad,
uint16_t ad_length_b,
void *dest,
const void *src,
uint16_t src_length_b,
void *tag,
uint8_t tag_length_b)
{
gcm128_ctx_t ctx;
DUMP_LEN(key, 16);
DUMP_LEN(iv, (iv_length_b + 7) / 8);
DUMP_LEN(ad, (ad_length_b + 7) / 8);
DUMP_LEN(src, (src_length_b + 7) / 8);
if (gcm128_init(&ctx, &aes128_desc, key, 128, iv, iv_length_b)) {
return -1;
}
gcm128_add_ad_final_block(&ctx, ad, ad_length_b);
gcm128_encrypt_final_block(&ctx, dest, src, src_length_b);
gcm128_finalize(&ctx, tag, tag_length_b);
if (dest) {
DUMP_LEN(dest, (src_length_b + 7) / 8);
}
DUMP_LEN(tag, (tag_length_b + 7) / 8);
return 0;
}
int8_t gcm128_simple_progmem(
const void *key_p,
uint16_t key_length_b,
const void *iv_p,
uint16_t iv_length_b,
const void * ad_p,
uint16_t ad_length_b,
const void *src_p,
uint16_t src_length_b,
void *tag,
uint8_t tag_length_b)
{
int8_t r;
gcm128_ctx_t ctx;
const bcdesc_t *cipher;
switch (key_length_b) {
case 128: cipher = &aes128_desc; break;
case 192: cipher = &aes192_desc; break;
case 256: cipher = &aes256_desc; break;
default: return -1;
}
{
uint8_t key[key_length_b / 8];
uint8_t iv[(iv_length_b + 7) / 8];
memcpy_P(key, key_p, key_length_b / 8);
memcpy_P(iv, iv_p, (iv_length_b + 7) / 8);
if ((r = gcm128_init(&ctx, cipher, key, key_length_b, iv, iv_length_b))) {
printf_P(PSTR("DBG: (Oooops) Error: %"PRId8"\n"), r);
uart0_flush();
return -1;
}
}
uint8_t tmp[GCM128_BLOCK_BYTES];
while (ad_length_b >= GCM128_BLOCK_BITS) {
memcpy_P(tmp, ad_p, GCM128_BLOCK_BYTES);
ad_p = &((uint8_t*)ad_p)[GCM128_BLOCK_BYTES];
ad_length_b -= GCM128_BLOCK_BITS;
gcm128_add_ad_block(&ctx, tmp);
}
memcpy_P(tmp, ad_p, (ad_length_b + 7) / 8);
gcm128_add_ad_final_block(&ctx, tmp, ad_length_b);
while (src_length_b >= GCM128_BLOCK_BITS) {
memcpy_P(tmp, src_p, GCM128_BLOCK_BYTES);
src_p = &((uint8_t*)src_p)[GCM128_BLOCK_BYTES];
src_length_b -= GCM128_BLOCK_BITS;
gcm128_encrypt_block(&ctx, tmp, tmp);
// DUMP(tmp);
}
memcpy_P(tmp, src_p, (src_length_b + 7) / 8);
gcm128_encrypt_final_block(&ctx, tmp, tmp, src_length_b);
if (src_length_b > 0) {
// DUMP_LEN(tmp, (src_length_b + 7) / 8);
}
gcm128_finalize(&ctx, tag, tag_length_b);
return 0;
}
void testrun_gcm128(void)
{
uint8_t key[16];
uint8_t iv[12];
uint8_t tag[16];
uint8_t plain[16];
uint8_t cipher[16];
memset(key, 0, sizeof(key));
memset(iv, 0, sizeof(iv));
memset(plain, 0, sizeof(plain));
gcm128_simple(key, iv, 96, NULL, 0, NULL, NULL, 0, tag, 128);
gcm128_simple(key, iv, 96, NULL, 0, cipher, plain, 128, tag, 128);
}
void testrun_gcm128_progmem(void)
{
test_t t;
uint8_t tag[16];
uint8_t i;
for (i = 0; i < elementsof(test_set); ++i) {
printf_P(PSTR("== Test %"PRId8" ==\n"), i + 1);
uart0_flush();
memcpy_P(&t, &test_set[i], sizeof(t));
gcm128_simple_progmem(
t.key, t.key_length_b,
t.iv, t.iv_length_b,
t.ad, t.ad_length_b,
t.pt, t.pt_length_b,
tag, 128);
DUMP(tag);
puts("\n\n");
uart0_flush();
}
}
/*****************************************************************************
* main *
*****************************************************************************/
const char nessie_str[] PROGMEM = "nessie";
const char test_str[] PROGMEM = "test";
const char ftest_str[] PROGMEM = "ftest";
const char gtest_str[] PROGMEM = "gtest";
const char performance_str[] PROGMEM = "performance";
const char echo_str[] PROGMEM = "echo";
const cmdlist_entry_t cmdlist[] PROGMEM = {
// { nessie_str, NULL, NULL },
{ test_str, NULL, testrun_gcm128_progmem},
// { ftest_str, NULL, testrun_f32},
// { gtest_str, NULL, testrun_g32},
// { performance_str, NULL, testrun_performance_arcfour},
{ echo_str, (void*)1, (void_fpt)echo_ctrl},
{ NULL, NULL, NULL}
};
int main(void) {
main_setup();
for(;;){
welcome_msg(algo_name);
cmd_interface(cmdlist);
}
}