/** As rsa_ed_crosscert_parse(), but do not allocate the output
* object.
*/
static ssize_t
rsa_ed_crosscert_parse_into(rsa_ed_crosscert_t *obj, const uint8_t *input, const size_t len_in)
{
const uint8_t *ptr = input;
size_t remaining = len_in;
ssize_t result = 0;
(void)result;
/* Parse u8 ed_key[32] */
CHECK_REMAINING(32, truncated);
memcpy(obj->ed_key, ptr, 32);
remaining -= 32; ptr += 32;
/* Parse u32 expiration */
CHECK_REMAINING(4, truncated);
obj->expiration = trunnel_ntohl(trunnel_get_uint32(ptr));
remaining -= 4; ptr += 4;
obj->end_of_signed = ptr;
/* Parse u8 sig_len */
CHECK_REMAINING(1, truncated);
obj->sig_len = (trunnel_get_uint8(ptr));
remaining -= 1; ptr += 1;
/* Parse u8 sig[sig_len] */
CHECK_REMAINING(obj->sig_len, truncated);
TRUNNEL_DYNARRAY_EXPAND(uint8_t, &obj->sig, obj->sig_len, {});
obj->sig.n_ = obj->sig_len;
if (obj->sig_len)
memcpy(obj->sig.elts_, ptr, obj->sig_len);
ptr += obj->sig_len; remaining -= obj->sig_len;
trunnel_assert(ptr + remaining == input + len_in);
return len_in - remaining;
truncated:
return -2;
trunnel_alloc_failed:
return -1;
}
/** As pwbox_encoded_parse(), but do not allocate the output object.
*/
static ssize_t
pwbox_encoded_parse_into(pwbox_encoded_t *obj, const uint8_t *input, const size_t len_in)
{
const uint8_t *ptr = input;
size_t remaining = len_in;
ssize_t result = 0;
(void)result;
/* Parse u32 fixedbytes0 IN [PWBOX0_CONST0] */
CHECK_REMAINING(4, truncated);
obj->fixedbytes0 = trunnel_ntohl(trunnel_get_uint32(ptr));
remaining -= 4; ptr += 4;
if (! (obj->fixedbytes0 == PWBOX0_CONST0))
goto fail;
/* Parse u32 fixedbytes1 IN [PWBOX0_CONST1] */
CHECK_REMAINING(4, truncated);
obj->fixedbytes1 = trunnel_ntohl(trunnel_get_uint32(ptr));
remaining -= 4; ptr += 4;
if (! (obj->fixedbytes1 == PWBOX0_CONST1))
goto fail;
/* Parse u8 header_len */
CHECK_REMAINING(1, truncated);
obj->header_len = (trunnel_get_uint8(ptr));
remaining -= 1; ptr += 1;
/* Parse u8 skey_header[header_len] */
CHECK_REMAINING(obj->header_len, truncated);
TRUNNEL_DYNARRAY_EXPAND(uint8_t, &obj->skey_header, obj->header_len, {});
obj->skey_header.n_ = obj->header_len;
memcpy(obj->skey_header.elts_, ptr, obj->header_len);
ptr += obj->header_len; remaining -= obj->header_len;
/* Parse u8 iv[16] */
CHECK_REMAINING(16, truncated);
memcpy(obj->iv, ptr, 16);
remaining -= 16; ptr += 16;
{
size_t remaining_after;
CHECK_REMAINING(32, truncated);
remaining_after = 32;
remaining = remaining - 32;
/* Parse u8 data[] */
TRUNNEL_DYNARRAY_EXPAND(uint8_t, &obj->data, remaining, {});
obj->data.n_ = remaining;
memcpy(obj->data.elts_, ptr, remaining);
ptr += remaining; remaining -= remaining;
if (remaining != 0)
goto fail;
remaining = remaining_after;
}
/* Parse u8 hmac[32] */
CHECK_REMAINING(32, truncated);
memcpy(obj->hmac, ptr, 32);
remaining -= 32; ptr += 32;
trunnel_assert(ptr + remaining == input + len_in);
return len_in - remaining;
truncated:
return -2;
trunnel_alloc_failed:
return -1;
fail:
result = -1;
return result;
}
