//
// Flatten the valid iolist to the buffer of
// appropriate size pointed to by ptr
//
uint8_t *iolist_flatten(term_t l, uint8_t *ptr)
{
if (is_nil(l))
return ptr;
if (is_cons(l))
{
do {
uint32_t *term_data = peel_cons(l);
term_t e = term_data[0];
if (is_int(e))
*ptr++ = int_value(e);
else
{
assert(is_list(e) || (is_boxed(e) && is_binary(peel_boxed(e))));
ptr = iolist_flatten(e, ptr);
}
l = term_data[1];
if (is_boxed(l) && is_binary(peel_boxed(l)))
return iolist_flatten(l, ptr);
} while (is_cons(l));
assert(is_nil(l));
}
else // is_binary()
{
bits_t bs, to;
bits_get_real(peel_boxed(l), &bs);
bits_init_buf(ptr, (bs.ends +7) /8, &to);
ptr += (bs.ends - bs.starts) /8;
bits_copy(&bs, &to);
assert(bs.starts == bs.ends);
}
return ptr;
}
term_t cbif_sha_update2(proc_t *proc, term_t *regs)
{
term_t Context = regs[0];
term_t Data = regs[1];
if (!is_boxed_binary(Context))
badarg(Context);
bits_t bs, dst;
bits_get_real(peel_boxed(Context), &bs);
if (bs.ends -bs.starts != sizeof(struct sha1_ctx) *8)
badarg(Context);
struct sha1_ctx ctx;
bits_init_buf((uint8_t *)&ctx, sizeof(ctx), &dst);
bits_copy(&bs, &dst);
if (!is_boxed_binary(Data) && !is_list(Data))
badarg(Data);
int sz = iolist_size(Data);
if (sz < 0)
badarg(Data);
assert(sz <= 65536); //TODO: use heap_tmp_buf for larger Data
uint8_t buf[sz];
iolist_flatten(Data, buf);
sha1_update(&ctx, sz, buf);
uint8_t *ptr;
term_t bin = heap_make_bin(&proc->hp, sizeof(ctx), &ptr);
memcpy(ptr, &ctx, sizeof(ctx));
return bin;
}
term_t cbif_aes_cbc_crypt4(proc_t *proc, term_t *regs)
{
term_t Key = regs[0];
term_t IVec = regs[1];
term_t Data = regs[2];
term_t Dir = regs[3];
if (!is_list(Key) && !is_boxed_binary(Key))
badarg(Key);
if (!is_boxed_binary(IVec))
badarg(IVec);
if (!is_list(Data) && !is_boxed_binary(Data))
badarg(Data);
if (!is_bool(Dir))
badarg(Dir);
int key_size = iolist_size(Key);
if (key_size < AES_MIN_KEY_SIZE || key_size > AES_MAX_KEY_SIZE)
badarg(Key);
uint8_t key_buf[key_size];
iolist_flatten(Key, key_buf);
bits_t src, dst;
bits_get_real(peel_boxed(IVec), &src);
if (src.ends -src.starts != AES_BLOCK_SIZE *8)
badarg(IVec);
uint8_t ivec_buf[AES_BLOCK_SIZE];
bits_init_buf(ivec_buf, AES_BLOCK_SIZE, &dst);
bits_copy(&src, &dst);
int data_size = iolist_size(Data);
if (data_size < 0)
badarg(Data);
assert(data_size <= 65536); //TODO: use heap_tmp_buf for larger Data
uint8_t data_buf[data_size];
iolist_flatten(Data, data_buf);
struct CBC_CTX(struct aes_ctx, AES_BLOCK_SIZE) ctx;
if (Dir == A_TRUE)
aes_set_encrypt_key((struct aes_ctx *)&ctx, key_size, key_buf);
else
aes_set_decrypt_key((struct aes_ctx *)&ctx, key_size, key_buf);
CBC_SET_IV(&ctx, ivec_buf);
uint8_t *ptr;
term_t cipher_text = heap_make_bin(&proc->hp, data_size, &ptr);
if (Dir == A_TRUE)
CBC_ENCRYPT(&ctx, aes_encrypt, data_size, ptr, data_buf);
else
CBC_DECRYPT(&ctx, aes_decrypt, data_size, ptr, data_buf);
return cipher_text;
}
term_t cbif_sha_final1(proc_t *proc, term_t *regs)
{
term_t Context = regs[0];
if (!is_boxed_binary(Context))
badarg(Context);
bits_t bs, dst;
bits_get_real(peel_boxed(Context), &bs);
if (bs.ends -bs.starts != sizeof(struct sha1_ctx) *8)
badarg(Context);
struct sha1_ctx ctx;
bits_init_buf((uint8_t *)&ctx, sizeof(ctx), &dst);
bits_copy(&bs, &dst);
uint8_t *ptr;
term_t bin = heap_make_bin(&proc->hp, SHA1_DIGEST_SIZE, &ptr);
sha1_digest(&ctx, SHA1_DIGEST_SIZE, ptr);
return bin;
}
//
// Flatten the valid bits list to the bits_t context
//
void bits_list_flatten(term_t l, bits_t *bs)
{
if (is_nil(l))
return;
if (is_cons(l))
{
do {
uint32_t *term_data = peel_cons(l);
term_t e = term_data[0];
if (is_int(e))
{
int o = int_value(e);
assert(o >= 0 && o < 256);
bits_put_octet(bs, (uint8_t)o);
}
else
{
assert(is_list(e) || (is_boxed(e) && is_binary(peel_boxed(e))));
bits_list_flatten(e, bs);
}
l = term_data[1];
if (is_boxed(l) && is_binary(peel_boxed(l)))
{
bits_list_flatten(l, bs);
return;
}
} while (is_cons(l));
assert(is_nil(l));
}
else // is_binary()
{
bits_t source;
bits_get_real(peel_boxed(l), &source);
bits_copy(&source, bs);
}
}
