tor/src/trunnel/link_handshake.c

/* link_handshake.c -- generated by Trunnel v1.4-pre.
 * 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 runnning 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)

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(const auth_challenge_cell_t *inp, size_t idx)
{
  trunnel_assert(idx < 32);
  return inp->challenge[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;
}
uint16_t
auth_challenge_cell_get_n_methods(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);
}

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_;
}
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 (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;
}
auth_ctx_t *
auth_ctx_new(void)
{
  auth_ctx_t *val = trunnel_calloc(1, sizeof(auth_ctx_t));
  if (NULL == val)
    return NULL;
  return val;
}

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

void
auth_ctx_free(auth_ctx_t *obj)
{
  if (obj == NULL)
    return;
  auth_ctx_clear(obj);
  trunnel_memwipe(obj, sizeof(auth_ctx_t));
  trunnel_free_(obj);
}

uint8_t
auth_ctx_get_is_ed(auth_ctx_t *inp)
{
  return inp->is_ed;
}
int
auth_ctx_set_is_ed(auth_ctx_t *inp, uint8_t val)
{
  inp->is_ed = val;
  return 0;
}
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(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(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);
}

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_;
}
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 (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;
    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;
  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(const rsa_ed_crosscert_t *inp, size_t idx)
{
  trunnel_assert(idx < 32);
  return inp->ed_key[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;
}
uint32_t
rsa_ed_crosscert_get_expiration(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(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);
}

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_;
}
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 (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;
    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;
  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;
}
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(const auth1_t *inp, size_t idx)
{
  trunnel_assert(idx < 8);
  return inp->type[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;
}
size_t
auth1_getlen_cid(const auth1_t *inp)
{
  (void)inp;  return 32;
}

uint8_t
auth1_get_cid(const auth1_t *inp, size_t idx)
{
  trunnel_assert(idx < 32);
  return inp->cid[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;
}
size_t
auth1_getlen_sid(const auth1_t *inp)
{
  (void)inp;  return 32;
}

uint8_t
auth1_get_sid(const auth1_t *inp, size_t idx)
{
  trunnel_assert(idx < 32);
  return inp->sid[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;
}
size_t
auth1_getlen_u1_cid_ed(const auth1_t *inp)
{
  (void)inp;  return 32;
}

uint8_t
auth1_get_u1_cid_ed(const auth1_t *inp, size_t idx)
{
  trunnel_assert(idx < 32);
  return inp->u1_cid_ed[idx];
}

int
auth1_set_u1_cid_ed(auth1_t *inp, size_t idx, uint8_t elt)
{
  trunnel_assert(idx < 32);
  inp->u1_cid_ed[idx] = elt;
  return 0;
}

uint8_t *
auth1_getarray_u1_cid_ed(auth1_t *inp)
{
  return inp->u1_cid_ed;
}
size_t
auth1_getlen_u1_sid_ed(const auth1_t *inp)
{
  (void)inp;  return 32;
}

uint8_t
auth1_get_u1_sid_ed(const auth1_t *inp, size_t idx)
{
  trunnel_assert(idx < 32);
  return inp->u1_sid_ed[idx];
}

int
auth1_set_u1_sid_ed(auth1_t *inp, size_t idx, uint8_t elt)
{
  trunnel_assert(idx < 32);
  inp->u1_sid_ed[idx] = elt;
  return 0;
}

uint8_t *
auth1_getarray_u1_sid_ed(auth1_t *inp)
{
  return inp->u1_sid_ed;
}
size_t
auth1_getlen_slog(const auth1_t *inp)
{
  (void)inp;  return 32;
}

uint8_t
auth1_get_slog(const auth1_t *inp, size_t idx)
{
  trunnel_assert(idx < 32);
  return inp->slog[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;
}
size_t
auth1_getlen_clog(const auth1_t *inp)
{
  (void)inp;  return 32;
}

uint8_t
auth1_get_clog(const auth1_t *inp, size_t idx)
{
  trunnel_assert(idx < 32);
  return inp->clog[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;
}
size_t
auth1_getlen_scert(const auth1_t *inp)
{
  (void)inp;  return 32;
}

uint8_t
auth1_get_scert(const auth1_t *inp, size_t idx)
{
  trunnel_assert(idx < 32);
  return inp->scert[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;
}
size_t
auth1_getlen_tlssecrets(const auth1_t *inp)
{
  (void)inp;  return 32;
}

uint8_t
auth1_get_tlssecrets(const auth1_t *inp, size_t idx)
{
  trunnel_assert(idx < 32);
  return inp->tlssecrets[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_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(const auth1_t *inp, size_t idx)
{
  trunnel_assert(idx < 24);
  return inp->rand[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_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);
}

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_;
}
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 (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, const auth_ctx_t *auth_ctx_ctx)
{
  if (obj == NULL)
    return "Object was NULL";
  if (obj->trunnel_error_code_)
    return "A set function failed on this object";
  if (auth_ctx_ctx == NULL)
    return "Context was NULL";
  switch (auth_ctx_ctx->is_ed) {

    case 0:
      break;

    case 1:
      break;

    default:
        return "Bad tag for union";
      break;
  }
  return NULL;
}

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

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


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

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

  /* Length of u8 sid[32] */
  result += 32;
  switch (auth_ctx_ctx->is_ed) {

    case 0:
      break;

    case 1:

      /* Length of u8 u1_cid_ed[32] */
      result += 32;

      /* Length of u8 u1_sid_ed[32] */
      result += 32;
      break;

    default:
      trunnel_assert(0);
      break;
  }

  /* 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, const auth_ctx_t *auth_ctx_ctx)
{
  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, auth_ctx_ctx);
#endif

  if (NULL != (msg = auth1_check(obj, auth_ctx_ctx)))
    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 union u1[auth_ctx.is_ed] */
  trunnel_assert(written <= avail);
  switch (auth_ctx_ctx->is_ed) {

    case 0:
      break;

    case 1:

      /* Encode u8 u1_cid_ed[32] */
      trunnel_assert(written <= avail);
      if (avail - written < 32)
        goto truncated;
      memcpy(ptr, obj->u1_cid_ed, 32);
      written += 32; ptr += 32;

      /* Encode u8 u1_sid_ed[32] */
      trunnel_assert(written <= avail);
      if (avail - written < 32)
        goto truncated;
      memcpy(ptr, obj->u1_sid_ed, 32);
      written += 32; ptr += 32;
      break;

    default:
      trunnel_assert(0);
      break;
  }

  /* 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;
    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 auth_ctx_t *auth_ctx_ctx)
{
  const uint8_t *ptr = input;
  size_t remaining = len_in;
  ssize_t result = 0;
  (void)result;
  if (auth_ctx_ctx == NULL)
    return -1;

  /* 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 union u1[auth_ctx.is_ed] */
  switch (auth_ctx_ctx->is_ed) {

    case 0:
      break;

    case 1:

      /* Parse u8 u1_cid_ed[32] */
      CHECK_REMAINING(32, truncated);
      memcpy(obj->u1_cid_ed, ptr, 32);
      remaining -= 32; ptr += 32;

      /* Parse u8 u1_sid_ed[32] */
      CHECK_REMAINING(32, truncated);
      memcpy(obj->u1_sid_ed, ptr, 32);
      remaining -= 32; ptr += 32;
      break;

    default:
      goto fail;
      break;
  }

  /* 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;
  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;
 fail:
  result = -1;
  return result;
}

ssize_t
auth1_parse(auth1_t **output, const uint8_t *input, const size_t len_in, const auth_ctx_t *auth_ctx_ctx)
{
  ssize_t result;
  *output = auth1_new();
  if (NULL == *output)
    return -1;
  result = auth1_parse_into(*output, input, len_in, auth_ctx_ctx);
  if (result < 0) {
    auth1_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(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);
}

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_;
}
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 (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:
  if (result >= 0) result = -1;
  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;
}