uint8_t bcal_ofb_init(const bcdesc_t* desc, const void* key, uint16_t keysize_b, bcal_ofb_ctx_t* ctx){
ctx->desc = (bcdesc_t*)desc;
ctx->blocksize_B = (bcal_cipher_getBlocksize_b(desc)+7)/8;
ctx->in_block=malloc(ctx->blocksize_B);
if(ctx->in_block==NULL){
return 0x11;
}
return bcal_cipher_init(desc, key, keysize_b, &(ctx->cctx));
}
uint8_t bcal_ctr_init(const bcdesc_t* desc, const void* key, uint16_t keysize_b, inc_fp_t inc_func, bcal_ctr_ctx_t* ctx){
ctx->desc = (bcdesc_t*)desc;
if(inc_func){
ctx->inc_func = inc_func;
}else{
ctx->inc_func = increment_be;
}
ctx->blocksize_B = (bcal_cipher_getBlocksize_b(desc)+7)/8;
ctx->in_block=malloc(ctx->blocksize_B);
if(ctx->in_block==NULL){
return 0x11;
}
return bcal_cipher_init(desc, key, keysize_b, &(ctx->cctx));
}
uint8_t bcal_cmac_init(const bcdesc_t *desc, const void *key,
uint16_t keysize_b, bcal_cmac_ctx_t *ctx)
{
uint8_t r;
ctx->desc = (bcdesc_t*) desc;
ctx->blocksize_B = bcal_cipher_getBlocksize_b(desc) / 8;
if (ctx->blocksize_B != 128 / 8 && ctx->blocksize_B != 64 / 8) {
return 0x13;
}
ctx->accu = malloc(ctx->blocksize_B);
if (ctx->accu == NULL) {
return 0x14;
}
ctx->k1 = malloc(ctx->blocksize_B);
if (ctx->k1 == NULL) {
return 0x15;
}
ctx->k2 = malloc(ctx->blocksize_B);
if (ctx->k2 == NULL) {
return 0x16;
}
ctx->lastblock = malloc(ctx->blocksize_B);
if (ctx->lastblock == NULL) {
return 0x17;
}
r = bcal_cipher_init(desc, key, keysize_b, &(ctx->cctx));
if (r) {
return r;
}
if (ctx->blocksize_B == 128 / 8) {
r = const_128;
} else {
r = const_64;
}
/* subkey computation */
memset(ctx->accu, 0x00, ctx->blocksize_B);
memset(ctx->k1, 0x00, ctx->blocksize_B);
bcal_cipher_enc(ctx->k1, &(ctx->cctx));
if (left_shift_be_block(ctx->k1, ctx->blocksize_B)) {
ctx->k1[ctx->blocksize_B - 1] ^= r;
}
memcpy(ctx->k2, ctx->k1, ctx->blocksize_B);
if (left_shift_be_block(ctx->k2, ctx->blocksize_B)) {
ctx->k2[ctx->blocksize_B - 1] ^= r;
}
ctx->last_set = 0;
return 0;
}
void testrun_test_aes(void){
uint8_t key[16] = { 0x2b, 0x7e, 0x15, 0x16,
0x28, 0xae, 0xd2, 0xa6,
0xab, 0xf7, 0x15, 0x88,
0x09, 0xcf, 0x4f, 0x3c };
uint8_t data[16] = { 0x32, 0x43, 0xf6, 0xa8,
0x88, 0x5a, 0x30, 0x8d,
0x31, 0x31, 0x98, 0xa2,
0xe0, 0x37, 0x07, 0x34 };
aes128_ctx_t ctx;
aes128_init(key, &ctx);
cli_putstr("\r\n\r\n cipher test (FIPS 197):\r\n key: ");
cli_hexdump(key, 16);
cli_putstr("\r\n plaintext: ");
cli_hexdump(data, 16);
aes128_enc(data, &ctx);
cli_putstr("\r\n ciphertext: ");
cli_hexdump(data, 16);
aes128_dec(data, &ctx);
cli_putstr("\r\n plaintext: ");
cli_hexdump(data, 16);
cli_putstr("\r\n testing bcal:");
bcgen_ctx_t bcal_ctx;
uint8_t r;
r = bcal_cipher_init(&aes128_desc, key, 128, &bcal_ctx);
cli_putstr("\r\n init = 0x");
cli_hexdump(&r, 1);
bcal_cipher_enc(data, &bcal_ctx);
cli_putstr("\r\n ciphertext: ");
cli_hexdump(data, 16);
bcal_cipher_dec(data, &bcal_ctx);
cli_putstr("\r\n plaintext: ");
cli_hexdump(data, 16);
bcal_cipher_free(&bcal_ctx);
}