diff options
Diffstat (limited to 'src/trunnel/ed25519_cert.c')
| -rw-r--r-- | src/trunnel/ed25519_cert.c | 887 |
1 files changed, 887 insertions, 0 deletions
diff --git a/src/trunnel/ed25519_cert.c b/src/trunnel/ed25519_cert.c new file mode 100644 index 0000000000..ee010dbff9 --- /dev/null +++ b/src/trunnel/ed25519_cert.c @@ -0,0 +1,887 @@ +/* ed25519_cert.c -- generated by Trunnel v1.4.3. + * https://gitweb.torproject.org/trunnel.git + * You probably shouldn't edit this file. + */ +#include <stdlib.h> +#include "trunnel-impl.h" + +#include "ed25519_cert.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 edcert_deadcode_dummy__ = 0; +#define OR_DEADCODE_DUMMY || edcert_deadcode_dummy__ +#else +#define OR_DEADCODE_DUMMY +#endif + +#define CHECK_REMAINING(nbytes, label) \ + do { \ + if (remaining < (nbytes) OR_DEADCODE_DUMMY) { \ + goto label; \ + } \ + } while (0) + +ed25519_cert_extension_t * +ed25519_cert_extension_new(void) +{ + ed25519_cert_extension_t *val = trunnel_calloc(1, sizeof(ed25519_cert_extension_t)); + if (NULL == val) + return NULL; + return val; +} + +/** Release all storage held inside 'obj', but do not free 'obj'. + */ +static void +ed25519_cert_extension_clear(ed25519_cert_extension_t *obj) +{ + (void) obj; + TRUNNEL_DYNARRAY_WIPE(&obj->un_unparsed); + TRUNNEL_DYNARRAY_CLEAR(&obj->un_unparsed); +} + +void +ed25519_cert_extension_free(ed25519_cert_extension_t *obj) +{ + if (obj == NULL) + return; + ed25519_cert_extension_clear(obj); + trunnel_memwipe(obj, sizeof(ed25519_cert_extension_t)); + trunnel_free_(obj); +} + +uint16_t +ed25519_cert_extension_get_ext_length(ed25519_cert_extension_t *inp) +{ + return inp->ext_length; +} +int +ed25519_cert_extension_set_ext_length(ed25519_cert_extension_t *inp, uint16_t val) +{ + inp->ext_length = val; + return 0; +} +uint8_t +ed25519_cert_extension_get_ext_type(ed25519_cert_extension_t *inp) +{ + return inp->ext_type; +} +int +ed25519_cert_extension_set_ext_type(ed25519_cert_extension_t *inp, uint8_t val) +{ + inp->ext_type = val; + return 0; +} +uint8_t +ed25519_cert_extension_get_ext_flags(ed25519_cert_extension_t *inp) +{ + return inp->ext_flags; +} +int +ed25519_cert_extension_set_ext_flags(ed25519_cert_extension_t *inp, uint8_t val) +{ + inp->ext_flags = val; + return 0; +} +size_t +ed25519_cert_extension_getlen_un_signing_key(const ed25519_cert_extension_t *inp) +{ + (void)inp; return 32; +} + +uint8_t +ed25519_cert_extension_get_un_signing_key(const ed25519_cert_extension_t *inp, size_t idx) +{ + trunnel_assert(idx < 32); + return inp->un_signing_key[idx]; +} + +int +ed25519_cert_extension_set_un_signing_key(ed25519_cert_extension_t *inp, size_t idx, uint8_t elt) +{ + trunnel_assert(idx < 32); + inp->un_signing_key[idx] = elt; + return 0; +} + +uint8_t * +ed25519_cert_extension_getarray_un_signing_key(ed25519_cert_extension_t *inp) +{ + return inp->un_signing_key; +} +size_t +ed25519_cert_extension_getlen_un_unparsed(const ed25519_cert_extension_t *inp) +{ + return TRUNNEL_DYNARRAY_LEN(&inp->un_unparsed); +} + +uint8_t +ed25519_cert_extension_get_un_unparsed(ed25519_cert_extension_t *inp, size_t idx) +{ + return TRUNNEL_DYNARRAY_GET(&inp->un_unparsed, idx); +} + +int +ed25519_cert_extension_set_un_unparsed(ed25519_cert_extension_t *inp, size_t idx, uint8_t elt) +{ + TRUNNEL_DYNARRAY_SET(&inp->un_unparsed, idx, elt); + return 0; +} +int +ed25519_cert_extension_add_un_unparsed(ed25519_cert_extension_t *inp, uint8_t elt) +{ + TRUNNEL_DYNARRAY_ADD(uint8_t, &inp->un_unparsed, elt, {}); + return 0; + trunnel_alloc_failed: + TRUNNEL_SET_ERROR_CODE(inp); + return -1; +} + +uint8_t * +ed25519_cert_extension_getarray_un_unparsed(ed25519_cert_extension_t *inp) +{ + return inp->un_unparsed.elts_; +} +int +ed25519_cert_extension_setlen_un_unparsed(ed25519_cert_extension_t *inp, size_t newlen) +{ + uint8_t *newptr; + newptr = trunnel_dynarray_setlen(&inp->un_unparsed.allocated_, + &inp->un_unparsed.n_, inp->un_unparsed.elts_, newlen, + sizeof(inp->un_unparsed.elts_[0]), (trunnel_free_fn_t) NULL, + &inp->trunnel_error_code_); + if (newptr == NULL) + goto trunnel_alloc_failed; + inp->un_unparsed.elts_ = newptr; + return 0; + trunnel_alloc_failed: + TRUNNEL_SET_ERROR_CODE(inp); + return -1; +} +const char * +ed25519_cert_extension_check(const ed25519_cert_extension_t *obj) +{ + if (obj == NULL) + return "Object was NULL"; + if (obj->trunnel_error_code_) + return "A set function failed on this object"; + switch (obj->ext_type) { + + case CERTEXT_SIGNED_WITH_KEY: + break; + + default: + break; + } + return NULL; +} + +ssize_t +ed25519_cert_extension_encoded_len(const ed25519_cert_extension_t *obj) +{ + ssize_t result = 0; + + if (NULL != ed25519_cert_extension_check(obj)) + return -1; + + + /* Length of u16 ext_length */ + result += 2; + + /* Length of u8 ext_type */ + result += 1; + + /* Length of u8 ext_flags */ + result += 1; + switch (obj->ext_type) { + + case CERTEXT_SIGNED_WITH_KEY: + + /* Length of u8 un_signing_key[32] */ + result += 32; + break; + + default: + + /* Length of u8 un_unparsed[] */ + result += TRUNNEL_DYNARRAY_LEN(&obj->un_unparsed); + break; + } + return result; +} +int +ed25519_cert_extension_clear_errors(ed25519_cert_extension_t *obj) +{ + int r = obj->trunnel_error_code_; + obj->trunnel_error_code_ = 0; + return r; +} +ssize_t +ed25519_cert_extension_encode(uint8_t *output, const size_t avail, const ed25519_cert_extension_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 = ed25519_cert_extension_encoded_len(obj); +#endif + + uint8_t *backptr_ext_length = NULL; + + if (NULL != (msg = ed25519_cert_extension_check(obj))) + goto check_failed; + +#ifdef TRUNNEL_CHECK_ENCODED_LEN + trunnel_assert(encoded_len >= 0); +#endif + + /* Encode u16 ext_length */ + backptr_ext_length = ptr; + trunnel_assert(written <= avail); + if (avail - written < 2) + goto truncated; + trunnel_set_uint16(ptr, trunnel_htons(obj->ext_length)); + written += 2; ptr += 2; + + /* Encode u8 ext_type */ + trunnel_assert(written <= avail); + if (avail - written < 1) + goto truncated; + trunnel_set_uint8(ptr, (obj->ext_type)); + written += 1; ptr += 1; + + /* Encode u8 ext_flags */ + trunnel_assert(written <= avail); + if (avail - written < 1) + goto truncated; + trunnel_set_uint8(ptr, (obj->ext_flags)); + written += 1; ptr += 1; + { + size_t written_before_union = written; + + /* Encode union un[ext_type] */ + trunnel_assert(written <= avail); + switch (obj->ext_type) { + + case CERTEXT_SIGNED_WITH_KEY: + + /* Encode u8 un_signing_key[32] */ + trunnel_assert(written <= avail); + if (avail - written < 32) + goto truncated; + memcpy(ptr, obj->un_signing_key, 32); + written += 32; ptr += 32; + break; + + default: + + /* Encode u8 un_unparsed[] */ + { + size_t elt_len = TRUNNEL_DYNARRAY_LEN(&obj->un_unparsed); + trunnel_assert(written <= avail); + if (avail - written < elt_len) + goto truncated; + memcpy(ptr, obj->un_unparsed.elts_, elt_len); + written += elt_len; ptr += elt_len; + } + break; + } + /* Write the length field back to ext_length */ + trunnel_assert(written >= written_before_union); +#if UINT16_MAX < SIZE_MAX + if (written - written_before_union > UINT16_MAX) + goto check_failed; +#endif + trunnel_set_uint16(backptr_ext_length, trunnel_htons(written - written_before_union)); + } + + + 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 ed25519_cert_extension_parse(), but do not allocate the output + * object. + */ +static ssize_t +ed25519_cert_extension_parse_into(ed25519_cert_extension_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 u16 ext_length */ + CHECK_REMAINING(2, truncated); + obj->ext_length = trunnel_ntohs(trunnel_get_uint16(ptr)); + remaining -= 2; ptr += 2; + + /* Parse u8 ext_type */ + CHECK_REMAINING(1, truncated); + obj->ext_type = (trunnel_get_uint8(ptr)); + remaining -= 1; ptr += 1; + + /* Parse u8 ext_flags */ + CHECK_REMAINING(1, truncated); + obj->ext_flags = (trunnel_get_uint8(ptr)); + remaining -= 1; ptr += 1; + { + size_t remaining_after; + CHECK_REMAINING(obj->ext_length, truncated); + remaining_after = remaining - obj->ext_length; + remaining = obj->ext_length; + + /* Parse union un[ext_type] */ + switch (obj->ext_type) { + + case CERTEXT_SIGNED_WITH_KEY: + + /* Parse u8 un_signing_key[32] */ + CHECK_REMAINING(32, fail); + memcpy(obj->un_signing_key, ptr, 32); + remaining -= 32; ptr += 32; + break; + + default: + + /* Parse u8 un_unparsed[] */ + TRUNNEL_DYNARRAY_EXPAND(uint8_t, &obj->un_unparsed, remaining, {}); + obj->un_unparsed.n_ = remaining; + memcpy(obj->un_unparsed.elts_, ptr, remaining); + ptr += remaining; remaining -= remaining; + break; + } + if (remaining != 0) + goto fail; + remaining = remaining_after; + } + 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 +ed25519_cert_extension_parse(ed25519_cert_extension_t **output, const uint8_t *input, const size_t len_in) +{ + ssize_t result; + *output = ed25519_cert_extension_new(); + if (NULL == *output) + return -1; + result = ed25519_cert_extension_parse_into(*output, input, len_in); + if (result < 0) { + ed25519_cert_extension_free(*output); + *output = NULL; + } + return result; +} +ed25519_cert_t * +ed25519_cert_new(void) +{ + ed25519_cert_t *val = trunnel_calloc(1, sizeof(ed25519_cert_t)); + if (NULL == val) + return NULL; + val->version = 1; + return val; +} + +/** Release all storage held inside 'obj', but do not free 'obj'. + */ +static void +ed25519_cert_clear(ed25519_cert_t *obj) +{ + (void) obj; + { + + unsigned idx; + for (idx = 0; idx < TRUNNEL_DYNARRAY_LEN(&obj->ext); ++idx) { + ed25519_cert_extension_free(TRUNNEL_DYNARRAY_GET(&obj->ext, idx)); + } + } + TRUNNEL_DYNARRAY_WIPE(&obj->ext); + TRUNNEL_DYNARRAY_CLEAR(&obj->ext); +} + +void +ed25519_cert_free(ed25519_cert_t *obj) +{ + if (obj == NULL) + return; + ed25519_cert_clear(obj); + trunnel_memwipe(obj, sizeof(ed25519_cert_t)); + trunnel_free_(obj); +} + +uint8_t +ed25519_cert_get_version(ed25519_cert_t *inp) +{ + return inp->version; +} +int +ed25519_cert_set_version(ed25519_cert_t *inp, uint8_t val) +{ + if (! ((val == 1))) { + TRUNNEL_SET_ERROR_CODE(inp); + return -1; + } + inp->version = val; + return 0; +} +uint8_t +ed25519_cert_get_cert_type(ed25519_cert_t *inp) +{ + return inp->cert_type; +} +int +ed25519_cert_set_cert_type(ed25519_cert_t *inp, uint8_t val) +{ + inp->cert_type = val; + return 0; +} +uint32_t +ed25519_cert_get_exp_field(ed25519_cert_t *inp) +{ + return inp->exp_field; +} +int +ed25519_cert_set_exp_field(ed25519_cert_t *inp, uint32_t val) +{ + inp->exp_field = val; + return 0; +} +uint8_t +ed25519_cert_get_cert_key_type(ed25519_cert_t *inp) +{ + return inp->cert_key_type; +} +int +ed25519_cert_set_cert_key_type(ed25519_cert_t *inp, uint8_t val) +{ + inp->cert_key_type = val; + return 0; +} +size_t +ed25519_cert_getlen_certified_key(const ed25519_cert_t *inp) +{ + (void)inp; return 32; +} + +uint8_t +ed25519_cert_get_certified_key(const ed25519_cert_t *inp, size_t idx) +{ + trunnel_assert(idx < 32); + return inp->certified_key[idx]; +} + +int +ed25519_cert_set_certified_key(ed25519_cert_t *inp, size_t idx, uint8_t elt) +{ + trunnel_assert(idx < 32); + inp->certified_key[idx] = elt; + return 0; +} + +uint8_t * +ed25519_cert_getarray_certified_key(ed25519_cert_t *inp) +{ + return inp->certified_key; +} +uint8_t +ed25519_cert_get_n_extensions(ed25519_cert_t *inp) +{ + return inp->n_extensions; +} +int +ed25519_cert_set_n_extensions(ed25519_cert_t *inp, uint8_t val) +{ + inp->n_extensions = val; + return 0; +} +size_t +ed25519_cert_getlen_ext(const ed25519_cert_t *inp) +{ + return TRUNNEL_DYNARRAY_LEN(&inp->ext); +} + +struct ed25519_cert_extension_st * +ed25519_cert_get_ext(ed25519_cert_t *inp, size_t idx) +{ + return TRUNNEL_DYNARRAY_GET(&inp->ext, idx); +} + +int +ed25519_cert_set_ext(ed25519_cert_t *inp, size_t idx, struct ed25519_cert_extension_st * elt) +{ + ed25519_cert_extension_t *oldval = TRUNNEL_DYNARRAY_GET(&inp->ext, idx); + if (oldval && oldval != elt) + ed25519_cert_extension_free(oldval); + return ed25519_cert_set0_ext(inp, idx, elt); +} +int +ed25519_cert_set0_ext(ed25519_cert_t *inp, size_t idx, struct ed25519_cert_extension_st * elt) +{ + TRUNNEL_DYNARRAY_SET(&inp->ext, idx, elt); + return 0; +} +int +ed25519_cert_add_ext(ed25519_cert_t *inp, struct ed25519_cert_extension_st * elt) +{ +#if SIZE_MAX >= UINT8_MAX + if (inp->ext.n_ == UINT8_MAX) + goto trunnel_alloc_failed; +#endif + TRUNNEL_DYNARRAY_ADD(struct ed25519_cert_extension_st *, &inp->ext, elt, {}); + return 0; + trunnel_alloc_failed: + TRUNNEL_SET_ERROR_CODE(inp); + return -1; +} + +struct ed25519_cert_extension_st * * +ed25519_cert_getarray_ext(ed25519_cert_t *inp) +{ + return inp->ext.elts_; +} +int +ed25519_cert_setlen_ext(ed25519_cert_t *inp, size_t newlen) +{ + struct ed25519_cert_extension_st * *newptr; +#if UINT8_MAX < SIZE_MAX + if (newlen > UINT8_MAX) + goto trunnel_alloc_failed; +#endif + newptr = trunnel_dynarray_setlen(&inp->ext.allocated_, + &inp->ext.n_, inp->ext.elts_, newlen, + sizeof(inp->ext.elts_[0]), (trunnel_free_fn_t) ed25519_cert_extension_free, + &inp->trunnel_error_code_); + if (newptr == NULL) + goto trunnel_alloc_failed; + inp->ext.elts_ = newptr; + return 0; + trunnel_alloc_failed: + TRUNNEL_SET_ERROR_CODE(inp); + return -1; +} +size_t +ed25519_cert_getlen_signature(const ed25519_cert_t *inp) +{ + (void)inp; return 64; +} + +uint8_t +ed25519_cert_get_signature(const ed25519_cert_t *inp, size_t idx) +{ + trunnel_assert(idx < 64); + return inp->signature[idx]; +} + +int +ed25519_cert_set_signature(ed25519_cert_t *inp, size_t idx, uint8_t elt) +{ + trunnel_assert(idx < 64); + inp->signature[idx] = elt; + return 0; +} + +uint8_t * +ed25519_cert_getarray_signature(ed25519_cert_t *inp) +{ + return inp->signature; +} +const char * +ed25519_cert_check(const ed25519_cert_t *obj) +{ + if (obj == NULL) + return "Object was NULL"; + if (obj->trunnel_error_code_) + return "A set function failed on this object"; + if (! (obj->version == 1)) + return "Integer out of bounds"; + { + const char *msg; + + unsigned idx; + for (idx = 0; idx < TRUNNEL_DYNARRAY_LEN(&obj->ext); ++idx) { + if (NULL != (msg = ed25519_cert_extension_check(TRUNNEL_DYNARRAY_GET(&obj->ext, idx)))) + return msg; + } + } + if (TRUNNEL_DYNARRAY_LEN(&obj->ext) != obj->n_extensions) + return "Length mismatch for ext"; + return NULL; +} + +ssize_t +ed25519_cert_encoded_len(const ed25519_cert_t *obj) +{ + ssize_t result = 0; + + if (NULL != ed25519_cert_check(obj)) + return -1; + + + /* Length of u8 version IN [1] */ + result += 1; + + /* Length of u8 cert_type */ + result += 1; + + /* Length of u32 exp_field */ + result += 4; + + /* Length of u8 cert_key_type */ + result += 1; + + /* Length of u8 certified_key[32] */ + result += 32; + + /* Length of u8 n_extensions */ + result += 1; + + /* Length of struct ed25519_cert_extension ext[n_extensions] */ + { + + unsigned idx; + for (idx = 0; idx < TRUNNEL_DYNARRAY_LEN(&obj->ext); ++idx) { + result += ed25519_cert_extension_encoded_len(TRUNNEL_DYNARRAY_GET(&obj->ext, idx)); + } + } + + /* Length of u8 signature[64] */ + result += 64; + return result; +} +int +ed25519_cert_clear_errors(ed25519_cert_t *obj) +{ + int r = obj->trunnel_error_code_; + obj->trunnel_error_code_ = 0; + return r; +} +ssize_t +ed25519_cert_encode(uint8_t *output, const size_t avail, const ed25519_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 = ed25519_cert_encoded_len(obj); +#endif + + if (NULL != (msg = ed25519_cert_check(obj))) + goto check_failed; + +#ifdef TRUNNEL_CHECK_ENCODED_LEN + trunnel_assert(encoded_len >= 0); +#endif + + /* Encode u8 version IN [1] */ + trunnel_assert(written <= avail); + if (avail - written < 1) + goto truncated; + trunnel_set_uint8(ptr, (obj->version)); + written += 1; ptr += 1; + + /* 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 u32 exp_field */ + trunnel_assert(written <= avail); + if (avail - written < 4) + goto truncated; + trunnel_set_uint32(ptr, trunnel_htonl(obj->exp_field)); + written += 4; ptr += 4; + + /* Encode u8 cert_key_type */ + trunnel_assert(written <= avail); + if (avail - written < 1) + goto truncated; + trunnel_set_uint8(ptr, (obj->cert_key_type)); + written += 1; ptr += 1; + + /* Encode u8 certified_key[32] */ + trunnel_assert(written <= avail); + if (avail - written < 32) + goto truncated; + memcpy(ptr, obj->certified_key, 32); + written += 32; ptr += 32; + + /* Encode u8 n_extensions */ + trunnel_assert(written <= avail); + if (avail - written < 1) + goto truncated; + trunnel_set_uint8(ptr, (obj->n_extensions)); + written += 1; ptr += 1; + + /* Encode struct ed25519_cert_extension ext[n_extensions] */ + { + + unsigned idx; + for (idx = 0; idx < TRUNNEL_DYNARRAY_LEN(&obj->ext); ++idx) { + trunnel_assert(written <= avail); + result = ed25519_cert_extension_encode(ptr, avail - written, TRUNNEL_DYNARRAY_GET(&obj->ext, idx)); + if (result < 0) + goto fail; /* XXXXXXX !*/ + written += result; ptr += result; + } + } + + /* Encode u8 signature[64] */ + trunnel_assert(written <= avail); + if (avail - written < 64) + goto truncated; + memcpy(ptr, obj->signature, 64); + written += 64; ptr += 64; + + + 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 ed25519_cert_parse(), but do not allocate the output object. + */ +static ssize_t +ed25519_cert_parse_into(ed25519_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 version IN [1] */ + CHECK_REMAINING(1, truncated); + obj->version = (trunnel_get_uint8(ptr)); + remaining -= 1; ptr += 1; + if (! (obj->version == 1)) + goto fail; + + /* Parse u8 cert_type */ + CHECK_REMAINING(1, truncated); + obj->cert_type = (trunnel_get_uint8(ptr)); + remaining -= 1; ptr += 1; + + /* Parse u32 exp_field */ + CHECK_REMAINING(4, truncated); + obj->exp_field = trunnel_ntohl(trunnel_get_uint32(ptr)); + remaining -= 4; ptr += 4; + + /* Parse u8 cert_key_type */ + CHECK_REMAINING(1, truncated); + obj->cert_key_type = (trunnel_get_uint8(ptr)); + remaining -= 1; ptr += 1; + + /* Parse u8 certified_key[32] */ + CHECK_REMAINING(32, truncated); + memcpy(obj->certified_key, ptr, 32); + remaining -= 32; ptr += 32; + + /* Parse u8 n_extensions */ + CHECK_REMAINING(1, truncated); + obj->n_extensions = (trunnel_get_uint8(ptr)); + remaining -= 1; ptr += 1; + + /* Parse struct ed25519_cert_extension ext[n_extensions] */ + TRUNNEL_DYNARRAY_EXPAND(ed25519_cert_extension_t *, &obj->ext, obj->n_extensions, {}); + { + ed25519_cert_extension_t * elt; + unsigned idx; + for (idx = 0; idx < obj->n_extensions; ++idx) { + result = ed25519_cert_extension_parse(&elt, ptr, remaining); + if (result < 0) + goto relay_fail; + trunnel_assert((size_t)result <= remaining); + remaining -= result; ptr += result; + TRUNNEL_DYNARRAY_ADD(ed25519_cert_extension_t *, &obj->ext, elt, {ed25519_cert_extension_free(elt);}); + } + } + + /* Parse u8 signature[64] */ + CHECK_REMAINING(64, truncated); + memcpy(obj->signature, ptr, 64); + remaining -= 64; ptr += 64; + 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; + fail: + result = -1; + return result; +} + +ssize_t +ed25519_cert_parse(ed25519_cert_t **output, const uint8_t *input, const size_t len_in) +{ + ssize_t result; + *output = ed25519_cert_new(); + if (NULL == *output) + return -1; + result = ed25519_cert_parse_into(*output, input, len_in); + if (result < 0) { + ed25519_cert_free(*output); + *output = NULL; + } + return result; +} |