tor

link_handshake.c (43614B)

---

/* link_handshake.c -- generated by Trunnel v1.5.3.
* https://gitweb.torproject.org/trunnel.git
* You probably shouldn't edit this file.
*/
#include <stdlib.h>
#include "trunnel-impl.h"

#include "link_handshake.h"

#define TRUNNEL_SET_ERROR_CODE(obj) \
 do {                              \
   (obj)->trunnel_error_code_ = 1; \
 } while (0)

#if defined(__COVERITY__) || defined(__clang_analyzer__)
/* If we're running a static analysis tool, we don't want it to complain
* that some of our remaining-bytes checks are dead-code. */
int linkhandshake_deadcode_dummy__ = 0;
#define OR_DEADCODE_DUMMY || linkhandshake_deadcode_dummy__
#else
#define OR_DEADCODE_DUMMY
#endif

#define CHECK_REMAINING(nbytes, label)                           \
 do {                                                           \
   if (remaining < (nbytes) OR_DEADCODE_DUMMY) {                \
     goto label;                                                \
   }                                                            \
 } while (0)

auth1_t *
auth1_new(void)
{
 auth1_t *val = trunnel_calloc(1, sizeof(auth1_t));
 if (NULL == val)
   return NULL;
 return val;
}

/** Release all storage held inside 'obj', but do not free 'obj'.
*/
static void
auth1_clear(auth1_t *obj)
{
 (void) obj;
 TRUNNEL_DYNARRAY_WIPE(&obj->sig);
 TRUNNEL_DYNARRAY_CLEAR(&obj->sig);
}

void
auth1_free(auth1_t *obj)
{
 if (obj == NULL)
   return;
 auth1_clear(obj);
 trunnel_memwipe(obj, sizeof(auth1_t));
 trunnel_free_(obj);
}

size_t
auth1_getlen_type(const auth1_t *inp)
{
 (void)inp;  return 8;
}

uint8_t
auth1_get_type(auth1_t *inp, size_t idx)
{
 trunnel_assert(idx < 8);
 return inp->type[idx];
}

uint8_t
auth1_getconst_type(const auth1_t *inp, size_t idx)
{
 return auth1_get_type((auth1_t*)inp, idx);
}
int
auth1_set_type(auth1_t *inp, size_t idx, uint8_t elt)
{
 trunnel_assert(idx < 8);
 inp->type[idx] = elt;
 return 0;
}

uint8_t *
auth1_getarray_type(auth1_t *inp)
{
 return inp->type;
}
const uint8_t  *
auth1_getconstarray_type(const auth1_t *inp)
{
 return (const uint8_t  *)auth1_getarray_type((auth1_t*)inp);
}
size_t
auth1_getlen_cid(const auth1_t *inp)
{
 (void)inp;  return 32;
}

uint8_t
auth1_get_cid(auth1_t *inp, size_t idx)
{
 trunnel_assert(idx < 32);
 return inp->cid[idx];
}

uint8_t
auth1_getconst_cid(const auth1_t *inp, size_t idx)
{
 return auth1_get_cid((auth1_t*)inp, idx);
}
int
auth1_set_cid(auth1_t *inp, size_t idx, uint8_t elt)
{
 trunnel_assert(idx < 32);
 inp->cid[idx] = elt;
 return 0;
}

uint8_t *
auth1_getarray_cid(auth1_t *inp)
{
 return inp->cid;
}
const uint8_t  *
auth1_getconstarray_cid(const auth1_t *inp)
{
 return (const uint8_t  *)auth1_getarray_cid((auth1_t*)inp);
}
size_t
auth1_getlen_sid(const auth1_t *inp)
{
 (void)inp;  return 32;
}

uint8_t
auth1_get_sid(auth1_t *inp, size_t idx)
{
 trunnel_assert(idx < 32);
 return inp->sid[idx];
}

uint8_t
auth1_getconst_sid(const auth1_t *inp, size_t idx)
{
 return auth1_get_sid((auth1_t*)inp, idx);
}
int
auth1_set_sid(auth1_t *inp, size_t idx, uint8_t elt)
{
 trunnel_assert(idx < 32);
 inp->sid[idx] = elt;
 return 0;
}

uint8_t *
auth1_getarray_sid(auth1_t *inp)
{
 return inp->sid;
}
const uint8_t  *
auth1_getconstarray_sid(const auth1_t *inp)
{
 return (const uint8_t  *)auth1_getarray_sid((auth1_t*)inp);
}
size_t
auth1_getlen_cid_ed(const auth1_t *inp)
{
 (void)inp;  return 32;
}

uint8_t
auth1_get_cid_ed(auth1_t *inp, size_t idx)
{
 trunnel_assert(idx < 32);
 return inp->cid_ed[idx];
}

uint8_t
auth1_getconst_cid_ed(const auth1_t *inp, size_t idx)
{
 return auth1_get_cid_ed((auth1_t*)inp, idx);
}
int
auth1_set_cid_ed(auth1_t *inp, size_t idx, uint8_t elt)
{
 trunnel_assert(idx < 32);
 inp->cid_ed[idx] = elt;
 return 0;
}

uint8_t *
auth1_getarray_cid_ed(auth1_t *inp)
{
 return inp->cid_ed;
}
const uint8_t  *
auth1_getconstarray_cid_ed(const auth1_t *inp)
{
 return (const uint8_t  *)auth1_getarray_cid_ed((auth1_t*)inp);
}
size_t
auth1_getlen_sid_ed(const auth1_t *inp)
{
 (void)inp;  return 32;
}

uint8_t
auth1_get_sid_ed(auth1_t *inp, size_t idx)
{
 trunnel_assert(idx < 32);
 return inp->sid_ed[idx];
}

uint8_t
auth1_getconst_sid_ed(const auth1_t *inp, size_t idx)
{
 return auth1_get_sid_ed((auth1_t*)inp, idx);
}
int
auth1_set_sid_ed(auth1_t *inp, size_t idx, uint8_t elt)
{
 trunnel_assert(idx < 32);
 inp->sid_ed[idx] = elt;
 return 0;
}

uint8_t *
auth1_getarray_sid_ed(auth1_t *inp)
{
 return inp->sid_ed;
}
const uint8_t  *
auth1_getconstarray_sid_ed(const auth1_t *inp)
{
 return (const uint8_t  *)auth1_getarray_sid_ed((auth1_t*)inp);
}
size_t
auth1_getlen_slog(const auth1_t *inp)
{
 (void)inp;  return 32;
}

uint8_t
auth1_get_slog(auth1_t *inp, size_t idx)
{
 trunnel_assert(idx < 32);
 return inp->slog[idx];
}

uint8_t
auth1_getconst_slog(const auth1_t *inp, size_t idx)
{
 return auth1_get_slog((auth1_t*)inp, idx);
}
int
auth1_set_slog(auth1_t *inp, size_t idx, uint8_t elt)
{
 trunnel_assert(idx < 32);
 inp->slog[idx] = elt;
 return 0;
}

uint8_t *
auth1_getarray_slog(auth1_t *inp)
{
 return inp->slog;
}
const uint8_t  *
auth1_getconstarray_slog(const auth1_t *inp)
{
 return (const uint8_t  *)auth1_getarray_slog((auth1_t*)inp);
}
size_t
auth1_getlen_clog(const auth1_t *inp)
{
 (void)inp;  return 32;
}

uint8_t
auth1_get_clog(auth1_t *inp, size_t idx)
{
 trunnel_assert(idx < 32);
 return inp->clog[idx];
}

uint8_t
auth1_getconst_clog(const auth1_t *inp, size_t idx)
{
 return auth1_get_clog((auth1_t*)inp, idx);
}
int
auth1_set_clog(auth1_t *inp, size_t idx, uint8_t elt)
{
 trunnel_assert(idx < 32);
 inp->clog[idx] = elt;
 return 0;
}

uint8_t *
auth1_getarray_clog(auth1_t *inp)
{
 return inp->clog;
}
const uint8_t  *
auth1_getconstarray_clog(const auth1_t *inp)
{
 return (const uint8_t  *)auth1_getarray_clog((auth1_t*)inp);
}
size_t
auth1_getlen_scert(const auth1_t *inp)
{
 (void)inp;  return 32;
}

uint8_t
auth1_get_scert(auth1_t *inp, size_t idx)
{
 trunnel_assert(idx < 32);
 return inp->scert[idx];
}

uint8_t
auth1_getconst_scert(const auth1_t *inp, size_t idx)
{
 return auth1_get_scert((auth1_t*)inp, idx);
}
int
auth1_set_scert(auth1_t *inp, size_t idx, uint8_t elt)
{
 trunnel_assert(idx < 32);
 inp->scert[idx] = elt;
 return 0;
}

uint8_t *
auth1_getarray_scert(auth1_t *inp)
{
 return inp->scert;
}
const uint8_t  *
auth1_getconstarray_scert(const auth1_t *inp)
{
 return (const uint8_t  *)auth1_getarray_scert((auth1_t*)inp);
}
size_t
auth1_getlen_tlssecrets(const auth1_t *inp)
{
 (void)inp;  return 32;
}

uint8_t
auth1_get_tlssecrets(auth1_t *inp, size_t idx)
{
 trunnel_assert(idx < 32);
 return inp->tlssecrets[idx];
}

uint8_t
auth1_getconst_tlssecrets(const auth1_t *inp, size_t idx)
{
 return auth1_get_tlssecrets((auth1_t*)inp, idx);
}
int
auth1_set_tlssecrets(auth1_t *inp, size_t idx, uint8_t elt)
{
 trunnel_assert(idx < 32);
 inp->tlssecrets[idx] = elt;
 return 0;
}

uint8_t *
auth1_getarray_tlssecrets(auth1_t *inp)
{
 return inp->tlssecrets;
}
const uint8_t  *
auth1_getconstarray_tlssecrets(const auth1_t *inp)
{
 return (const uint8_t  *)auth1_getarray_tlssecrets((auth1_t*)inp);
}
const uint8_t *
auth1_get_end_of_fixed_part(const auth1_t *inp)
{
 return inp->end_of_fixed_part;
}
size_t
auth1_getlen_rand(const auth1_t *inp)
{
 (void)inp;  return 24;
}

uint8_t
auth1_get_rand(auth1_t *inp, size_t idx)
{
 trunnel_assert(idx < 24);
 return inp->rand[idx];
}

uint8_t
auth1_getconst_rand(const auth1_t *inp, size_t idx)
{
 return auth1_get_rand((auth1_t*)inp, idx);
}
int
auth1_set_rand(auth1_t *inp, size_t idx, uint8_t elt)
{
 trunnel_assert(idx < 24);
 inp->rand[idx] = elt;
 return 0;
}

uint8_t *
auth1_getarray_rand(auth1_t *inp)
{
 return inp->rand;
}
const uint8_t  *
auth1_getconstarray_rand(const auth1_t *inp)
{
 return (const uint8_t  *)auth1_getarray_rand((auth1_t*)inp);
}
const uint8_t *
auth1_get_end_of_signed(const auth1_t *inp)
{
 return inp->end_of_signed;
}
size_t
auth1_getlen_sig(const auth1_t *inp)
{
 return TRUNNEL_DYNARRAY_LEN(&inp->sig);
}

uint8_t
auth1_get_sig(auth1_t *inp, size_t idx)
{
 return TRUNNEL_DYNARRAY_GET(&inp->sig, idx);
}

uint8_t
auth1_getconst_sig(const auth1_t *inp, size_t idx)
{
 return auth1_get_sig((auth1_t*)inp, idx);
}
int
auth1_set_sig(auth1_t *inp, size_t idx, uint8_t elt)
{
 TRUNNEL_DYNARRAY_SET(&inp->sig, idx, elt);
 return 0;
}
int
auth1_add_sig(auth1_t *inp, uint8_t elt)
{
 TRUNNEL_DYNARRAY_ADD(uint8_t, &inp->sig, elt, {});
 return 0;
trunnel_alloc_failed:
 TRUNNEL_SET_ERROR_CODE(inp);
 return -1;
}

uint8_t *
auth1_getarray_sig(auth1_t *inp)
{
 return inp->sig.elts_;
}
const uint8_t  *
auth1_getconstarray_sig(const auth1_t *inp)
{
 return (const uint8_t  *)auth1_getarray_sig((auth1_t*)inp);
}
int
auth1_setlen_sig(auth1_t *inp, size_t newlen)
{
 uint8_t *newptr;
 newptr = trunnel_dynarray_setlen(&inp->sig.allocated_,
                &inp->sig.n_, inp->sig.elts_, newlen,
                sizeof(inp->sig.elts_[0]), (trunnel_free_fn_t) NULL,
                &inp->trunnel_error_code_);
 if (newlen != 0 && newptr == NULL)
   goto trunnel_alloc_failed;
 inp->sig.elts_ = newptr;
 return 0;
trunnel_alloc_failed:
 TRUNNEL_SET_ERROR_CODE(inp);
 return -1;
}
const char *
auth1_check(const auth1_t *obj)
{
 if (obj == NULL)
   return "Object was NULL";
 if (obj->trunnel_error_code_)
   return "A set function failed on this object";
 return NULL;
}

ssize_t
auth1_encoded_len(const auth1_t *obj)
{
 ssize_t result = 0;

 if (NULL != auth1_check(obj))
    return -1;


 /* Length of u8 type[8] */
 result += 8;

 /* Length of u8 cid[32] */
 result += 32;

 /* Length of u8 sid[32] */
 result += 32;

 /* Length of u8 cid_ed[32] */
 result += 32;

 /* Length of u8 sid_ed[32] */
 result += 32;

 /* Length of u8 slog[32] */
 result += 32;

 /* Length of u8 clog[32] */
 result += 32;

 /* Length of u8 scert[32] */
 result += 32;

 /* Length of u8 tlssecrets[32] */
 result += 32;

 /* Length of u8 rand[24] */
 result += 24;

 /* Length of u8 sig[] */
 result += TRUNNEL_DYNARRAY_LEN(&obj->sig);
 return result;
}
int
auth1_clear_errors(auth1_t *obj)
{
 int r = obj->trunnel_error_code_;
 obj->trunnel_error_code_ = 0;
 return r;
}
ssize_t
auth1_encode(uint8_t *output, const size_t avail, const auth1_t *obj)
{
 ssize_t result = 0;
 size_t written = 0;
 uint8_t *ptr = output;
 const char *msg;
#ifdef TRUNNEL_CHECK_ENCODED_LEN
 const ssize_t encoded_len = auth1_encoded_len(obj);
#endif

 if (NULL != (msg = auth1_check(obj)))
   goto check_failed;

#ifdef TRUNNEL_CHECK_ENCODED_LEN
 trunnel_assert(encoded_len >= 0);
#endif

 /* Encode u8 type[8] */
 trunnel_assert(written <= avail);
 if (avail - written < 8)
   goto truncated;
 memcpy(ptr, obj->type, 8);
 written += 8; ptr += 8;

 /* Encode u8 cid[32] */
 trunnel_assert(written <= avail);
 if (avail - written < 32)
   goto truncated;
 memcpy(ptr, obj->cid, 32);
 written += 32; ptr += 32;

 /* Encode u8 sid[32] */
 trunnel_assert(written <= avail);
 if (avail - written < 32)
   goto truncated;
 memcpy(ptr, obj->sid, 32);
 written += 32; ptr += 32;

 /* Encode u8 cid_ed[32] */
 trunnel_assert(written <= avail);
 if (avail - written < 32)
   goto truncated;
 memcpy(ptr, obj->cid_ed, 32);
 written += 32; ptr += 32;

 /* Encode u8 sid_ed[32] */
 trunnel_assert(written <= avail);
 if (avail - written < 32)
   goto truncated;
 memcpy(ptr, obj->sid_ed, 32);
 written += 32; ptr += 32;

 /* Encode u8 slog[32] */
 trunnel_assert(written <= avail);
 if (avail - written < 32)
   goto truncated;
 memcpy(ptr, obj->slog, 32);
 written += 32; ptr += 32;

 /* Encode u8 clog[32] */
 trunnel_assert(written <= avail);
 if (avail - written < 32)
   goto truncated;
 memcpy(ptr, obj->clog, 32);
 written += 32; ptr += 32;

 /* Encode u8 scert[32] */
 trunnel_assert(written <= avail);
 if (avail - written < 32)
   goto truncated;
 memcpy(ptr, obj->scert, 32);
 written += 32; ptr += 32;

 /* Encode u8 tlssecrets[32] */
 trunnel_assert(written <= avail);
 if (avail - written < 32)
   goto truncated;
 memcpy(ptr, obj->tlssecrets, 32);
 written += 32; ptr += 32;

 /* Encode u8 rand[24] */
 trunnel_assert(written <= avail);
 if (avail - written < 24)
   goto truncated;
 memcpy(ptr, obj->rand, 24);
 written += 24; ptr += 24;

 /* Encode u8 sig[] */
 {
   size_t elt_len = TRUNNEL_DYNARRAY_LEN(&obj->sig);
   trunnel_assert(written <= avail);
   if (avail - written < elt_len)
     goto truncated;
   if (elt_len)
     memcpy(ptr, obj->sig.elts_, elt_len);
   written += elt_len; ptr += elt_len;
 }


 trunnel_assert(ptr == output + written);
#ifdef TRUNNEL_CHECK_ENCODED_LEN
 {
   trunnel_assert(encoded_len >= 0);
   trunnel_assert((size_t)encoded_len == written);
 }

#endif

 return written;

truncated:
 result = -2;
 goto fail;
check_failed:
 (void)msg;
 result = -1;
 goto fail;
fail:
 trunnel_assert(result < 0);
 return result;
}

/** As auth1_parse(), but do not allocate the output object.
*/
static ssize_t
auth1_parse_into(auth1_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 type[8] */
 CHECK_REMAINING(8, truncated);
 memcpy(obj->type, ptr, 8);
 remaining -= 8; ptr += 8;

 /* Parse u8 cid[32] */
 CHECK_REMAINING(32, truncated);
 memcpy(obj->cid, ptr, 32);
 remaining -= 32; ptr += 32;

 /* Parse u8 sid[32] */
 CHECK_REMAINING(32, truncated);
 memcpy(obj->sid, ptr, 32);
 remaining -= 32; ptr += 32;

 /* Parse u8 cid_ed[32] */
 CHECK_REMAINING(32, truncated);
 memcpy(obj->cid_ed, ptr, 32);
 remaining -= 32; ptr += 32;

 /* Parse u8 sid_ed[32] */
 CHECK_REMAINING(32, truncated);
 memcpy(obj->sid_ed, ptr, 32);
 remaining -= 32; ptr += 32;

 /* Parse u8 slog[32] */
 CHECK_REMAINING(32, truncated);
 memcpy(obj->slog, ptr, 32);
 remaining -= 32; ptr += 32;

 /* Parse u8 clog[32] */
 CHECK_REMAINING(32, truncated);
 memcpy(obj->clog, ptr, 32);
 remaining -= 32; ptr += 32;

 /* Parse u8 scert[32] */
 CHECK_REMAINING(32, truncated);
 memcpy(obj->scert, ptr, 32);
 remaining -= 32; ptr += 32;

 /* Parse u8 tlssecrets[32] */
 CHECK_REMAINING(32, truncated);
 memcpy(obj->tlssecrets, ptr, 32);
 remaining -= 32; ptr += 32;
 obj->end_of_fixed_part = ptr;

 /* Parse u8 rand[24] */
 CHECK_REMAINING(24, truncated);
 memcpy(obj->rand, ptr, 24);
 remaining -= 24; ptr += 24;
 obj->end_of_signed = ptr;

 /* Parse u8 sig[] */
 TRUNNEL_DYNARRAY_EXPAND(uint8_t, &obj->sig, remaining, {});
 obj->sig.n_ = remaining;
 if (remaining)
   memcpy(obj->sig.elts_, ptr, remaining);
 ptr += remaining; remaining -= remaining;
 trunnel_assert(ptr + remaining == input + len_in);
 return len_in - remaining;

truncated:
 return -2;
trunnel_alloc_failed:
 return -1;
}

ssize_t
auth1_parse(auth1_t **output, const uint8_t *input, const size_t len_in)
{
 ssize_t result;
 *output = auth1_new();
 if (NULL == *output)
   return -1;
 result = auth1_parse_into(*output, input, len_in);
 if (result < 0) {
   auth1_free(*output);
   *output = NULL;
 }
 return result;
}
auth_challenge_cell_t *
auth_challenge_cell_new(void)
{
 auth_challenge_cell_t *val = trunnel_calloc(1, sizeof(auth_challenge_cell_t));
 if (NULL == val)
   return NULL;
 return val;
}

/** Release all storage held inside 'obj', but do not free 'obj'.
*/
static void
auth_challenge_cell_clear(auth_challenge_cell_t *obj)
{
 (void) obj;
 TRUNNEL_DYNARRAY_WIPE(&obj->methods);
 TRUNNEL_DYNARRAY_CLEAR(&obj->methods);
}

void
auth_challenge_cell_free(auth_challenge_cell_t *obj)
{
 if (obj == NULL)
   return;
 auth_challenge_cell_clear(obj);
 trunnel_memwipe(obj, sizeof(auth_challenge_cell_t));
 trunnel_free_(obj);
}

size_t
auth_challenge_cell_getlen_challenge(const auth_challenge_cell_t *inp)
{
 (void)inp;  return 32;
}

uint8_t
auth_challenge_cell_get_challenge(auth_challenge_cell_t *inp, size_t idx)
{
 trunnel_assert(idx < 32);
 return inp->challenge[idx];
}

uint8_t
auth_challenge_cell_getconst_challenge(const auth_challenge_cell_t *inp, size_t idx)
{
 return auth_challenge_cell_get_challenge((auth_challenge_cell_t*)inp, idx);
}
int
auth_challenge_cell_set_challenge(auth_challenge_cell_t *inp, size_t idx, uint8_t elt)
{
 trunnel_assert(idx < 32);
 inp->challenge[idx] = elt;
 return 0;
}

uint8_t *
auth_challenge_cell_getarray_challenge(auth_challenge_cell_t *inp)
{
 return inp->challenge;
}
const uint8_t  *
auth_challenge_cell_getconstarray_challenge(const auth_challenge_cell_t *inp)
{
 return (const uint8_t  *)auth_challenge_cell_getarray_challenge((auth_challenge_cell_t*)inp);
}
uint16_t
auth_challenge_cell_get_n_methods(const auth_challenge_cell_t *inp)
{
 return inp->n_methods;
}
int
auth_challenge_cell_set_n_methods(auth_challenge_cell_t *inp, uint16_t val)
{
 inp->n_methods = val;
 return 0;
}
size_t
auth_challenge_cell_getlen_methods(const auth_challenge_cell_t *inp)
{
 return TRUNNEL_DYNARRAY_LEN(&inp->methods);
}

uint16_t
auth_challenge_cell_get_methods(auth_challenge_cell_t *inp, size_t idx)
{
 return TRUNNEL_DYNARRAY_GET(&inp->methods, idx);
}

uint16_t
auth_challenge_cell_getconst_methods(const auth_challenge_cell_t *inp, size_t idx)
{
 return auth_challenge_cell_get_methods((auth_challenge_cell_t*)inp, idx);
}
int
auth_challenge_cell_set_methods(auth_challenge_cell_t *inp, size_t idx, uint16_t elt)
{
 TRUNNEL_DYNARRAY_SET(&inp->methods, idx, elt);
 return 0;
}
int
auth_challenge_cell_add_methods(auth_challenge_cell_t *inp, uint16_t elt)
{
#if SIZE_MAX >= UINT16_MAX
 if (inp->methods.n_ == UINT16_MAX)
   goto trunnel_alloc_failed;
#endif
 TRUNNEL_DYNARRAY_ADD(uint16_t, &inp->methods, elt, {});
 return 0;
trunnel_alloc_failed:
 TRUNNEL_SET_ERROR_CODE(inp);
 return -1;
}

uint16_t *
auth_challenge_cell_getarray_methods(auth_challenge_cell_t *inp)
{
 return inp->methods.elts_;
}
const uint16_t  *
auth_challenge_cell_getconstarray_methods(const auth_challenge_cell_t *inp)
{
 return (const uint16_t  *)auth_challenge_cell_getarray_methods((auth_challenge_cell_t*)inp);
}
int
auth_challenge_cell_setlen_methods(auth_challenge_cell_t *inp, size_t newlen)
{
 uint16_t *newptr;
#if UINT16_MAX < SIZE_MAX
 if (newlen > UINT16_MAX)
   goto trunnel_alloc_failed;
#endif
 newptr = trunnel_dynarray_setlen(&inp->methods.allocated_,
                &inp->methods.n_, inp->methods.elts_, newlen,
                sizeof(inp->methods.elts_[0]), (trunnel_free_fn_t) NULL,
                &inp->trunnel_error_code_);
 if (newlen != 0 && newptr == NULL)
   goto trunnel_alloc_failed;
 inp->methods.elts_ = newptr;
 return 0;
trunnel_alloc_failed:
 TRUNNEL_SET_ERROR_CODE(inp);
 return -1;
}
const char *
auth_challenge_cell_check(const auth_challenge_cell_t *obj)
{
 if (obj == NULL)
   return "Object was NULL";
 if (obj->trunnel_error_code_)
   return "A set function failed on this object";
 if (TRUNNEL_DYNARRAY_LEN(&obj->methods) != obj->n_methods)
   return "Length mismatch for methods";
 return NULL;
}

ssize_t
auth_challenge_cell_encoded_len(const auth_challenge_cell_t *obj)
{
 ssize_t result = 0;

 if (NULL != auth_challenge_cell_check(obj))
    return -1;


 /* Length of u8 challenge[32] */
 result += 32;

 /* Length of u16 n_methods */
 result += 2;

 /* Length of u16 methods[n_methods] */
 result += 2 * TRUNNEL_DYNARRAY_LEN(&obj->methods);
 return result;
}
int
auth_challenge_cell_clear_errors(auth_challenge_cell_t *obj)
{
 int r = obj->trunnel_error_code_;
 obj->trunnel_error_code_ = 0;
 return r;
}
ssize_t
auth_challenge_cell_encode(uint8_t *output, const size_t avail, const auth_challenge_cell_t *obj)
{
 ssize_t result = 0;
 size_t written = 0;
 uint8_t *ptr = output;
 const char *msg;
#ifdef TRUNNEL_CHECK_ENCODED_LEN
 const ssize_t encoded_len = auth_challenge_cell_encoded_len(obj);
#endif

 if (NULL != (msg = auth_challenge_cell_check(obj)))
   goto check_failed;

#ifdef TRUNNEL_CHECK_ENCODED_LEN
 trunnel_assert(encoded_len >= 0);
#endif

 /* Encode u8 challenge[32] */
 trunnel_assert(written <= avail);
 if (avail - written < 32)
   goto truncated;
 memcpy(ptr, obj->challenge, 32);
 written += 32; ptr += 32;

 /* Encode u16 n_methods */
 trunnel_assert(written <= avail);
 if (avail - written < 2)
   goto truncated;
 trunnel_set_uint16(ptr, trunnel_htons(obj->n_methods));
 written += 2; ptr += 2;

 /* Encode u16 methods[n_methods] */
 {

   unsigned idx;
   for (idx = 0; idx < TRUNNEL_DYNARRAY_LEN(&obj->methods); ++idx) {
     trunnel_assert(written <= avail);
     if (avail - written < 2)
       goto truncated;
     trunnel_set_uint16(ptr, trunnel_htons(TRUNNEL_DYNARRAY_GET(&obj->methods, idx)));
     written += 2; ptr += 2;
   }
 }


 trunnel_assert(ptr == output + written);
#ifdef TRUNNEL_CHECK_ENCODED_LEN
 {
   trunnel_assert(encoded_len >= 0);
   trunnel_assert((size_t)encoded_len == written);
 }

#endif

 return written;

truncated:
 result = -2;
 goto fail;
check_failed:
 (void)msg;
 result = -1;
 goto fail;
fail:
 trunnel_assert(result < 0);
 return result;
}

/** As auth_challenge_cell_parse(), but do not allocate the output
* object.
*/
static ssize_t
auth_challenge_cell_parse_into(auth_challenge_cell_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 challenge[32] */
 CHECK_REMAINING(32, truncated);
 memcpy(obj->challenge, ptr, 32);
 remaining -= 32; ptr += 32;

 /* Parse u16 n_methods */
 CHECK_REMAINING(2, truncated);
 obj->n_methods = trunnel_ntohs(trunnel_get_uint16(ptr));
 remaining -= 2; ptr += 2;

 /* Parse u16 methods[n_methods] */
 TRUNNEL_DYNARRAY_EXPAND(uint16_t, &obj->methods, obj->n_methods, {});
 {
   uint16_t elt;
   unsigned idx;
   for (idx = 0; idx < obj->n_methods; ++idx) {
     CHECK_REMAINING(2, truncated);
     elt = trunnel_ntohs(trunnel_get_uint16(ptr));
     remaining -= 2; ptr += 2;
     TRUNNEL_DYNARRAY_ADD(uint16_t, &obj->methods, elt, {});
   }
 }
 trunnel_assert(ptr + remaining == input + len_in);
 return len_in - remaining;

truncated:
 return -2;
trunnel_alloc_failed:
 return -1;
}

ssize_t
auth_challenge_cell_parse(auth_challenge_cell_t **output, const uint8_t *input, const size_t len_in)
{
 ssize_t result;
 *output = auth_challenge_cell_new();
 if (NULL == *output)
   return -1;
 result = auth_challenge_cell_parse_into(*output, input, len_in);
 if (result < 0) {
   auth_challenge_cell_free(*output);
   *output = NULL;
 }
 return result;
}
certs_cell_cert_t *
certs_cell_cert_new(void)
{
 certs_cell_cert_t *val = trunnel_calloc(1, sizeof(certs_cell_cert_t));
 if (NULL == val)
   return NULL;
 return val;
}

/** Release all storage held inside 'obj', but do not free 'obj'.
*/
static void
certs_cell_cert_clear(certs_cell_cert_t *obj)
{
 (void) obj;
 TRUNNEL_DYNARRAY_WIPE(&obj->body);
 TRUNNEL_DYNARRAY_CLEAR(&obj->body);
}

void
certs_cell_cert_free(certs_cell_cert_t *obj)
{
 if (obj == NULL)
   return;
 certs_cell_cert_clear(obj);
 trunnel_memwipe(obj, sizeof(certs_cell_cert_t));
 trunnel_free_(obj);
}

uint8_t
certs_cell_cert_get_cert_type(const certs_cell_cert_t *inp)
{
 return inp->cert_type;
}
int
certs_cell_cert_set_cert_type(certs_cell_cert_t *inp, uint8_t val)
{
 inp->cert_type = val;
 return 0;
}
uint16_t
certs_cell_cert_get_cert_len(const certs_cell_cert_t *inp)
{
 return inp->cert_len;
}
int
certs_cell_cert_set_cert_len(certs_cell_cert_t *inp, uint16_t val)
{
 inp->cert_len = val;
 return 0;
}
size_t
certs_cell_cert_getlen_body(const certs_cell_cert_t *inp)
{
 return TRUNNEL_DYNARRAY_LEN(&inp->body);
}

uint8_t
certs_cell_cert_get_body(certs_cell_cert_t *inp, size_t idx)
{
 return TRUNNEL_DYNARRAY_GET(&inp->body, idx);
}

uint8_t
certs_cell_cert_getconst_body(const certs_cell_cert_t *inp, size_t idx)
{
 return certs_cell_cert_get_body((certs_cell_cert_t*)inp, idx);
}
int
certs_cell_cert_set_body(certs_cell_cert_t *inp, size_t idx, uint8_t elt)
{
 TRUNNEL_DYNARRAY_SET(&inp->body, idx, elt);
 return 0;
}
int
certs_cell_cert_add_body(certs_cell_cert_t *inp, uint8_t elt)
{
#if SIZE_MAX >= UINT16_MAX
 if (inp->body.n_ == UINT16_MAX)
   goto trunnel_alloc_failed;
#endif
 TRUNNEL_DYNARRAY_ADD(uint8_t, &inp->body, elt, {});
 return 0;
trunnel_alloc_failed:
 TRUNNEL_SET_ERROR_CODE(inp);
 return -1;
}

uint8_t *
certs_cell_cert_getarray_body(certs_cell_cert_t *inp)
{
 return inp->body.elts_;
}
const uint8_t  *
certs_cell_cert_getconstarray_body(const certs_cell_cert_t *inp)
{
 return (const uint8_t  *)certs_cell_cert_getarray_body((certs_cell_cert_t*)inp);
}
int
certs_cell_cert_setlen_body(certs_cell_cert_t *inp, size_t newlen)
{
 uint8_t *newptr;
#if UINT16_MAX < SIZE_MAX
 if (newlen > UINT16_MAX)
   goto trunnel_alloc_failed;
#endif
 newptr = trunnel_dynarray_setlen(&inp->body.allocated_,
                &inp->body.n_, inp->body.elts_, newlen,
                sizeof(inp->body.elts_[0]), (trunnel_free_fn_t) NULL,
                &inp->trunnel_error_code_);
 if (newlen != 0 && newptr == NULL)
   goto trunnel_alloc_failed;
 inp->body.elts_ = newptr;
 return 0;
trunnel_alloc_failed:
 TRUNNEL_SET_ERROR_CODE(inp);
 return -1;
}
const char *
certs_cell_cert_check(const certs_cell_cert_t *obj)
{
 if (obj == NULL)
   return "Object was NULL";
 if (obj->trunnel_error_code_)
   return "A set function failed on this object";
 if (TRUNNEL_DYNARRAY_LEN(&obj->body) != obj->cert_len)
   return "Length mismatch for body";
 return NULL;
}

ssize_t
certs_cell_cert_encoded_len(const certs_cell_cert_t *obj)
{
 ssize_t result = 0;

 if (NULL != certs_cell_cert_check(obj))
    return -1;


 /* Length of u8 cert_type */
 result += 1;

 /* Length of u16 cert_len */
 result += 2;

 /* Length of u8 body[cert_len] */
 result += TRUNNEL_DYNARRAY_LEN(&obj->body);
 return result;
}
int
certs_cell_cert_clear_errors(certs_cell_cert_t *obj)
{
 int r = obj->trunnel_error_code_;
 obj->trunnel_error_code_ = 0;
 return r;
}
ssize_t
certs_cell_cert_encode(uint8_t *output, const size_t avail, const certs_cell_cert_t *obj)
{
 ssize_t result = 0;
 size_t written = 0;
 uint8_t *ptr = output;
 const char *msg;
#ifdef TRUNNEL_CHECK_ENCODED_LEN
 const ssize_t encoded_len = certs_cell_cert_encoded_len(obj);
#endif

 if (NULL != (msg = certs_cell_cert_check(obj)))
   goto check_failed;

#ifdef TRUNNEL_CHECK_ENCODED_LEN
 trunnel_assert(encoded_len >= 0);
#endif

 /* Encode u8 cert_type */
 trunnel_assert(written <= avail);
 if (avail - written < 1)
   goto truncated;
 trunnel_set_uint8(ptr, (obj->cert_type));
 written += 1; ptr += 1;

 /* Encode u16 cert_len */
 trunnel_assert(written <= avail);
 if (avail - written < 2)
   goto truncated;
 trunnel_set_uint16(ptr, trunnel_htons(obj->cert_len));
 written += 2; ptr += 2;

 /* Encode u8 body[cert_len] */
 {
   size_t elt_len = TRUNNEL_DYNARRAY_LEN(&obj->body);
   trunnel_assert(obj->cert_len == elt_len);
   trunnel_assert(written <= avail);
   if (avail - written < elt_len)
     goto truncated;
   if (elt_len)
     memcpy(ptr, obj->body.elts_, elt_len);
   written += elt_len; ptr += elt_len;
 }


 trunnel_assert(ptr == output + written);
#ifdef TRUNNEL_CHECK_ENCODED_LEN
 {
   trunnel_assert(encoded_len >= 0);
   trunnel_assert((size_t)encoded_len == written);
 }

#endif

 return written;

truncated:
 result = -2;
 goto fail;
check_failed:
 (void)msg;
 result = -1;
 goto fail;
fail:
 trunnel_assert(result < 0);
 return result;
}

/** As certs_cell_cert_parse(), but do not allocate the output object.
*/
static ssize_t
certs_cell_cert_parse_into(certs_cell_cert_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 cert_type */
 CHECK_REMAINING(1, truncated);
 obj->cert_type = (trunnel_get_uint8(ptr));
 remaining -= 1; ptr += 1;

 /* Parse u16 cert_len */
 CHECK_REMAINING(2, truncated);
 obj->cert_len = trunnel_ntohs(trunnel_get_uint16(ptr));
 remaining -= 2; ptr += 2;

 /* Parse u8 body[cert_len] */
 CHECK_REMAINING(obj->cert_len, truncated);
 TRUNNEL_DYNARRAY_EXPAND(uint8_t, &obj->body, obj->cert_len, {});
 obj->body.n_ = obj->cert_len;
 if (obj->cert_len)
   memcpy(obj->body.elts_, ptr, obj->cert_len);
 ptr += obj->cert_len; remaining -= obj->cert_len;
 trunnel_assert(ptr + remaining == input + len_in);
 return len_in - remaining;

truncated:
 return -2;
trunnel_alloc_failed:
 return -1;
}

ssize_t
certs_cell_cert_parse(certs_cell_cert_t **output, const uint8_t *input, const size_t len_in)
{
 ssize_t result;
 *output = certs_cell_cert_new();
 if (NULL == *output)
   return -1;
 result = certs_cell_cert_parse_into(*output, input, len_in);
 if (result < 0) {
   certs_cell_cert_free(*output);
   *output = NULL;
 }
 return result;
}
rsa_ed_crosscert_t *
rsa_ed_crosscert_new(void)
{
 rsa_ed_crosscert_t *val = trunnel_calloc(1, sizeof(rsa_ed_crosscert_t));
 if (NULL == val)
   return NULL;
 return val;
}

/** Release all storage held inside 'obj', but do not free 'obj'.
*/
static void
rsa_ed_crosscert_clear(rsa_ed_crosscert_t *obj)
{
 (void) obj;
 TRUNNEL_DYNARRAY_WIPE(&obj->sig);
 TRUNNEL_DYNARRAY_CLEAR(&obj->sig);
}

void
rsa_ed_crosscert_free(rsa_ed_crosscert_t *obj)
{
 if (obj == NULL)
   return;
 rsa_ed_crosscert_clear(obj);
 trunnel_memwipe(obj, sizeof(rsa_ed_crosscert_t));
 trunnel_free_(obj);
}

size_t
rsa_ed_crosscert_getlen_ed_key(const rsa_ed_crosscert_t *inp)
{
 (void)inp;  return 32;
}

uint8_t
rsa_ed_crosscert_get_ed_key(rsa_ed_crosscert_t *inp, size_t idx)
{
 trunnel_assert(idx < 32);
 return inp->ed_key[idx];
}

uint8_t
rsa_ed_crosscert_getconst_ed_key(const rsa_ed_crosscert_t *inp, size_t idx)
{
 return rsa_ed_crosscert_get_ed_key((rsa_ed_crosscert_t*)inp, idx);
}
int
rsa_ed_crosscert_set_ed_key(rsa_ed_crosscert_t *inp, size_t idx, uint8_t elt)
{
 trunnel_assert(idx < 32);
 inp->ed_key[idx] = elt;
 return 0;
}

uint8_t *
rsa_ed_crosscert_getarray_ed_key(rsa_ed_crosscert_t *inp)
{
 return inp->ed_key;
}
const uint8_t  *
rsa_ed_crosscert_getconstarray_ed_key(const rsa_ed_crosscert_t *inp)
{
 return (const uint8_t  *)rsa_ed_crosscert_getarray_ed_key((rsa_ed_crosscert_t*)inp);
}
uint32_t
rsa_ed_crosscert_get_expiration(const rsa_ed_crosscert_t *inp)
{
 return inp->expiration;
}
int
rsa_ed_crosscert_set_expiration(rsa_ed_crosscert_t *inp, uint32_t val)
{
 inp->expiration = val;
 return 0;
}
const uint8_t *
rsa_ed_crosscert_get_end_of_signed(const rsa_ed_crosscert_t *inp)
{
 return inp->end_of_signed;
}
uint8_t
rsa_ed_crosscert_get_sig_len(const rsa_ed_crosscert_t *inp)
{
 return inp->sig_len;
}
int
rsa_ed_crosscert_set_sig_len(rsa_ed_crosscert_t *inp, uint8_t val)
{
 inp->sig_len = val;
 return 0;
}
size_t
rsa_ed_crosscert_getlen_sig(const rsa_ed_crosscert_t *inp)
{
 return TRUNNEL_DYNARRAY_LEN(&inp->sig);
}

uint8_t
rsa_ed_crosscert_get_sig(rsa_ed_crosscert_t *inp, size_t idx)
{
 return TRUNNEL_DYNARRAY_GET(&inp->sig, idx);
}

uint8_t
rsa_ed_crosscert_getconst_sig(const rsa_ed_crosscert_t *inp, size_t idx)
{
 return rsa_ed_crosscert_get_sig((rsa_ed_crosscert_t*)inp, idx);
}
int
rsa_ed_crosscert_set_sig(rsa_ed_crosscert_t *inp, size_t idx, uint8_t elt)
{
 TRUNNEL_DYNARRAY_SET(&inp->sig, idx, elt);
 return 0;
}
int
rsa_ed_crosscert_add_sig(rsa_ed_crosscert_t *inp, uint8_t elt)
{
#if SIZE_MAX >= UINT8_MAX
 if (inp->sig.n_ == UINT8_MAX)
   goto trunnel_alloc_failed;
#endif
 TRUNNEL_DYNARRAY_ADD(uint8_t, &inp->sig, elt, {});
 return 0;
trunnel_alloc_failed:
 TRUNNEL_SET_ERROR_CODE(inp);
 return -1;
}

uint8_t *
rsa_ed_crosscert_getarray_sig(rsa_ed_crosscert_t *inp)
{
 return inp->sig.elts_;
}
const uint8_t  *
rsa_ed_crosscert_getconstarray_sig(const rsa_ed_crosscert_t *inp)
{
 return (const uint8_t  *)rsa_ed_crosscert_getarray_sig((rsa_ed_crosscert_t*)inp);
}
int
rsa_ed_crosscert_setlen_sig(rsa_ed_crosscert_t *inp, size_t newlen)
{
 uint8_t *newptr;
#if UINT8_MAX < SIZE_MAX
 if (newlen > UINT8_MAX)
   goto trunnel_alloc_failed;
#endif
 newptr = trunnel_dynarray_setlen(&inp->sig.allocated_,
                &inp->sig.n_, inp->sig.elts_, newlen,
                sizeof(inp->sig.elts_[0]), (trunnel_free_fn_t) NULL,
                &inp->trunnel_error_code_);
 if (newlen != 0 && newptr == NULL)
   goto trunnel_alloc_failed;
 inp->sig.elts_ = newptr;
 return 0;
trunnel_alloc_failed:
 TRUNNEL_SET_ERROR_CODE(inp);
 return -1;
}
const char *
rsa_ed_crosscert_check(const rsa_ed_crosscert_t *obj)
{
 if (obj == NULL)
   return "Object was NULL";
 if (obj->trunnel_error_code_)
   return "A set function failed on this object";
 if (TRUNNEL_DYNARRAY_LEN(&obj->sig) != obj->sig_len)
   return "Length mismatch for sig";
 return NULL;
}

ssize_t
rsa_ed_crosscert_encoded_len(const rsa_ed_crosscert_t *obj)
{
 ssize_t result = 0;

 if (NULL != rsa_ed_crosscert_check(obj))
    return -1;


 /* Length of u8 ed_key[32] */
 result += 32;

 /* Length of u32 expiration */
 result += 4;

 /* Length of u8 sig_len */
 result += 1;

 /* Length of u8 sig[sig_len] */
 result += TRUNNEL_DYNARRAY_LEN(&obj->sig);
 return result;
}
int
rsa_ed_crosscert_clear_errors(rsa_ed_crosscert_t *obj)
{
 int r = obj->trunnel_error_code_;
 obj->trunnel_error_code_ = 0;
 return r;
}
ssize_t
rsa_ed_crosscert_encode(uint8_t *output, const size_t avail, const rsa_ed_crosscert_t *obj)
{
 ssize_t result = 0;
 size_t written = 0;
 uint8_t *ptr = output;
 const char *msg;
#ifdef TRUNNEL_CHECK_ENCODED_LEN
 const ssize_t encoded_len = rsa_ed_crosscert_encoded_len(obj);
#endif

 if (NULL != (msg = rsa_ed_crosscert_check(obj)))
   goto check_failed;

#ifdef TRUNNEL_CHECK_ENCODED_LEN
 trunnel_assert(encoded_len >= 0);
#endif

 /* Encode u8 ed_key[32] */
 trunnel_assert(written <= avail);
 if (avail - written < 32)
   goto truncated;
 memcpy(ptr, obj->ed_key, 32);
 written += 32; ptr += 32;

 /* Encode u32 expiration */
 trunnel_assert(written <= avail);
 if (avail - written < 4)
   goto truncated;
 trunnel_set_uint32(ptr, trunnel_htonl(obj->expiration));
 written += 4; ptr += 4;

 /* Encode u8 sig_len */
 trunnel_assert(written <= avail);
 if (avail - written < 1)
   goto truncated;
 trunnel_set_uint8(ptr, (obj->sig_len));
 written += 1; ptr += 1;

 /* Encode u8 sig[sig_len] */
 {
   size_t elt_len = TRUNNEL_DYNARRAY_LEN(&obj->sig);
   trunnel_assert(obj->sig_len == elt_len);
   trunnel_assert(written <= avail);
   if (avail - written < elt_len)
     goto truncated;
   if (elt_len)
     memcpy(ptr, obj->sig.elts_, elt_len);
   written += elt_len; ptr += elt_len;
 }


 trunnel_assert(ptr == output + written);
#ifdef TRUNNEL_CHECK_ENCODED_LEN
 {
   trunnel_assert(encoded_len >= 0);
   trunnel_assert((size_t)encoded_len == written);
 }

#endif

 return written;

truncated:
 result = -2;
 goto fail;
check_failed:
 (void)msg;
 result = -1;
 goto fail;
fail:
 trunnel_assert(result < 0);
 return result;
}

/** 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;
}

ssize_t
rsa_ed_crosscert_parse(rsa_ed_crosscert_t **output, const uint8_t *input, const size_t len_in)
{
 ssize_t result;
 *output = rsa_ed_crosscert_new();
 if (NULL == *output)
   return -1;
 result = rsa_ed_crosscert_parse_into(*output, input, len_in);
 if (result < 0) {
   rsa_ed_crosscert_free(*output);
   *output = NULL;
 }
 return result;
}
certs_cell_t *
certs_cell_new(void)
{
 certs_cell_t *val = trunnel_calloc(1, sizeof(certs_cell_t));
 if (NULL == val)
   return NULL;
 return val;
}

/** Release all storage held inside 'obj', but do not free 'obj'.
*/
static void
certs_cell_clear(certs_cell_t *obj)
{
 (void) obj;
 {

   unsigned idx;
   for (idx = 0; idx < TRUNNEL_DYNARRAY_LEN(&obj->certs); ++idx) {
     certs_cell_cert_free(TRUNNEL_DYNARRAY_GET(&obj->certs, idx));
   }
 }
 TRUNNEL_DYNARRAY_WIPE(&obj->certs);
 TRUNNEL_DYNARRAY_CLEAR(&obj->certs);
}

void
certs_cell_free(certs_cell_t *obj)
{
 if (obj == NULL)
   return;
 certs_cell_clear(obj);
 trunnel_memwipe(obj, sizeof(certs_cell_t));
 trunnel_free_(obj);
}

uint8_t
certs_cell_get_n_certs(const certs_cell_t *inp)
{
 return inp->n_certs;
}
int
certs_cell_set_n_certs(certs_cell_t *inp, uint8_t val)
{
 inp->n_certs = val;
 return 0;
}
size_t
certs_cell_getlen_certs(const certs_cell_t *inp)
{
 return TRUNNEL_DYNARRAY_LEN(&inp->certs);
}

struct certs_cell_cert_st *
certs_cell_get_certs(certs_cell_t *inp, size_t idx)
{
 return TRUNNEL_DYNARRAY_GET(&inp->certs, idx);
}

const struct certs_cell_cert_st *
certs_cell_getconst_certs(const certs_cell_t *inp, size_t idx)
{
 return certs_cell_get_certs((certs_cell_t*)inp, idx);
}
int
certs_cell_set_certs(certs_cell_t *inp, size_t idx, struct certs_cell_cert_st * elt)
{
 certs_cell_cert_t *oldval = TRUNNEL_DYNARRAY_GET(&inp->certs, idx);
 if (oldval && oldval != elt)
   certs_cell_cert_free(oldval);
 return certs_cell_set0_certs(inp, idx, elt);
}
int
certs_cell_set0_certs(certs_cell_t *inp, size_t idx, struct certs_cell_cert_st * elt)
{
 TRUNNEL_DYNARRAY_SET(&inp->certs, idx, elt);
 return 0;
}
int
certs_cell_add_certs(certs_cell_t *inp, struct certs_cell_cert_st * elt)
{
#if SIZE_MAX >= UINT8_MAX
 if (inp->certs.n_ == UINT8_MAX)
   goto trunnel_alloc_failed;
#endif
 TRUNNEL_DYNARRAY_ADD(struct certs_cell_cert_st *, &inp->certs, elt, {});
 return 0;
trunnel_alloc_failed:
 TRUNNEL_SET_ERROR_CODE(inp);
 return -1;
}

struct certs_cell_cert_st * *
certs_cell_getarray_certs(certs_cell_t *inp)
{
 return inp->certs.elts_;
}
const struct certs_cell_cert_st *  const  *
certs_cell_getconstarray_certs(const certs_cell_t *inp)
{
 return (const struct certs_cell_cert_st *  const  *)certs_cell_getarray_certs((certs_cell_t*)inp);
}
int
certs_cell_setlen_certs(certs_cell_t *inp, size_t newlen)
{
 struct certs_cell_cert_st * *newptr;
#if UINT8_MAX < SIZE_MAX
 if (newlen > UINT8_MAX)
   goto trunnel_alloc_failed;
#endif
 newptr = trunnel_dynarray_setlen(&inp->certs.allocated_,
                &inp->certs.n_, inp->certs.elts_, newlen,
                sizeof(inp->certs.elts_[0]), (trunnel_free_fn_t) certs_cell_cert_free,
                &inp->trunnel_error_code_);
 if (newlen != 0 && newptr == NULL)
   goto trunnel_alloc_failed;
 inp->certs.elts_ = newptr;
 return 0;
trunnel_alloc_failed:
 TRUNNEL_SET_ERROR_CODE(inp);
 return -1;
}
const char *
certs_cell_check(const certs_cell_t *obj)
{
 if (obj == NULL)
   return "Object was NULL";
 if (obj->trunnel_error_code_)
   return "A set function failed on this object";
 {
   const char *msg;

   unsigned idx;
   for (idx = 0; idx < TRUNNEL_DYNARRAY_LEN(&obj->certs); ++idx) {
     if (NULL != (msg = certs_cell_cert_check(TRUNNEL_DYNARRAY_GET(&obj->certs, idx))))
       return msg;
   }
 }
 if (TRUNNEL_DYNARRAY_LEN(&obj->certs) != obj->n_certs)
   return "Length mismatch for certs";
 return NULL;
}

ssize_t
certs_cell_encoded_len(const certs_cell_t *obj)
{
 ssize_t result = 0;

 if (NULL != certs_cell_check(obj))
    return -1;


 /* Length of u8 n_certs */
 result += 1;

 /* Length of struct certs_cell_cert certs[n_certs] */
 {

   unsigned idx;
   for (idx = 0; idx < TRUNNEL_DYNARRAY_LEN(&obj->certs); ++idx) {
     result += certs_cell_cert_encoded_len(TRUNNEL_DYNARRAY_GET(&obj->certs, idx));
   }
 }
 return result;
}
int
certs_cell_clear_errors(certs_cell_t *obj)
{
 int r = obj->trunnel_error_code_;
 obj->trunnel_error_code_ = 0;
 return r;
}
ssize_t
certs_cell_encode(uint8_t *output, const size_t avail, const certs_cell_t *obj)
{
 ssize_t result = 0;
 size_t written = 0;
 uint8_t *ptr = output;
 const char *msg;
#ifdef TRUNNEL_CHECK_ENCODED_LEN
 const ssize_t encoded_len = certs_cell_encoded_len(obj);
#endif

 if (NULL != (msg = certs_cell_check(obj)))
   goto check_failed;

#ifdef TRUNNEL_CHECK_ENCODED_LEN
 trunnel_assert(encoded_len >= 0);
#endif

 /* Encode u8 n_certs */
 trunnel_assert(written <= avail);
 if (avail - written < 1)
   goto truncated;
 trunnel_set_uint8(ptr, (obj->n_certs));
 written += 1; ptr += 1;

 /* Encode struct certs_cell_cert certs[n_certs] */
 {

   unsigned idx;
   for (idx = 0; idx < TRUNNEL_DYNARRAY_LEN(&obj->certs); ++idx) {
     trunnel_assert(written <= avail);
     result = certs_cell_cert_encode(ptr, avail - written, TRUNNEL_DYNARRAY_GET(&obj->certs, idx));
     if (result < 0)
       goto fail; /* XXXXXXX !*/
     written += result; ptr += result;
   }
 }


 trunnel_assert(ptr == output + written);
#ifdef TRUNNEL_CHECK_ENCODED_LEN
 {
   trunnel_assert(encoded_len >= 0);
   trunnel_assert((size_t)encoded_len == written);
 }

#endif

 return written;

truncated:
 result = -2;
 goto fail;
check_failed:
 (void)msg;
 result = -1;
 goto fail;
fail:
 trunnel_assert(result < 0);
 return result;
}

/** As certs_cell_parse(), but do not allocate the output object.
*/
static ssize_t
certs_cell_parse_into(certs_cell_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 n_certs */
 CHECK_REMAINING(1, truncated);
 obj->n_certs = (trunnel_get_uint8(ptr));
 remaining -= 1; ptr += 1;

 /* Parse struct certs_cell_cert certs[n_certs] */
 TRUNNEL_DYNARRAY_EXPAND(certs_cell_cert_t *, &obj->certs, obj->n_certs, {});
 {
   certs_cell_cert_t * elt;
   unsigned idx;
   for (idx = 0; idx < obj->n_certs; ++idx) {
     result = certs_cell_cert_parse(&elt, ptr, remaining);
     if (result < 0)
       goto relay_fail;
     trunnel_assert((size_t)result <= remaining);
     remaining -= result; ptr += result;
     TRUNNEL_DYNARRAY_ADD(certs_cell_cert_t *, &obj->certs, elt, {certs_cell_cert_free(elt);});
   }
 }
 trunnel_assert(ptr + remaining == input + len_in);
 return len_in - remaining;

truncated:
 return -2;
relay_fail:
 trunnel_assert(result < 0);
 return result;
trunnel_alloc_failed:
 return -1;
}

ssize_t
certs_cell_parse(certs_cell_t **output, const uint8_t *input, const size_t len_in)
{
 ssize_t result;
 *output = certs_cell_new();
 if (NULL == *output)
   return -1;
 result = certs_cell_parse_into(*output, input, len_in);
 if (result < 0) {
   certs_cell_free(*output);
   *output = NULL;
 }
 return result;
}