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Add additional internal HPKE hardening checks resulting from code audit. 

Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/22493)
This commit is contained in:
Stephen Farrell 2023-10-16 21:04:06 +01:00 committed by Tomas Mraz
parent 04b53878ea
commit a1c0306895
6 changed files with 97 additions and 54 deletions
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100
crypto/hpke/hpke.c
View File

@ -19,8 +19,9 @@
#include <openssl/err.h>
#include "internal/hpke_util.h"
#include "internal/nelem.h"
#include "internal/common.h"
/** default buffer size for keys and internal buffers we use */
/* default buffer size for keys and internal buffers we use */
#define OSSL_HPKE_MAXSIZE 512
/* Define HPKE labels from RFC9180 in hex for EBCDIC compatibility */
@ -38,8 +39,6 @@ static const char OSSL_HPKE_EXP_LABEL[] = "\x65\x78\x70";
static const char OSSL_HPKE_EXP_SEC_LABEL[] = "\x73\x65\x63";
/* "key" - label for use when generating key from shared secret */
static const char OSSL_HPKE_KEY_LABEL[] = "\x6b\x65\x79";
/* "psk_hash" - for hashing PSK */
static const char OSSL_HPKE_PSK_HASH_LABEL[] = "\x70\x73\x6b\x5f\x68\x61\x73\x68";
/* "secret" - for generating shared secret */
static const char OSSL_HPKE_SECRET_LABEL[] = "\x73\x65\x63\x72\x65\x74";
@ -158,7 +157,6 @@ static int hpke_aead_dec(OSSL_HPKE_CTX *hctx, const unsigned char *iv,
/* Create and initialise the context */
if ((ctx = EVP_CIPHER_CTX_new()) == NULL)
return 0;
/* Initialise the decryption operation. */
if (EVP_DecryptInit_ex(ctx, hctx->aead_ciph, NULL, NULL, NULL) != 1) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_INTERNAL_ERROR);
@ -226,17 +224,20 @@ static int hpke_aead_enc(OSSL_HPKE_CTX *hctx, const unsigned char *iv,
EVP_CIPHER_CTX *ctx = NULL;
int len;
size_t taglen = 0;
unsigned char tag[16];
unsigned char tag[EVP_MAX_AEAD_TAG_LENGTH];
taglen = hctx->aead_info->taglen;
if (*ctlen <= taglen || ptlen > *ctlen - taglen) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_INVALID_ARGUMENT);
return 0;
}
if (!ossl_assert(taglen <= sizeof(tag))) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_INVALID_ARGUMENT);
return 0;
}
/* Create and initialise the context */
if ((ctx = EVP_CIPHER_CTX_new()) == NULL)
return 0;
/* Initialise the encryption operation. */
if (EVP_EncryptInit_ex(ctx, hctx->aead_ciph, NULL, NULL, NULL) != 1) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_INTERNAL_ERROR);
@ -396,7 +397,7 @@ static int hpke_expansion(OSSL_HPKE_SUITE suite,
const OSSL_HPKE_KEM_INFO *kem_info = NULL;
if (cipherlen == NULL || enclen == NULL) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_INTERNAL_ERROR);
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_INVALID_ARGUMENT);
return 0;
}
if (hpke_suite_check(suite, &kem_info, NULL, &aead_info) != 1) {
@ -448,14 +449,14 @@ static int hpke_encap(OSSL_HPKE_CTX *ctx, unsigned char *enc, size_t *enclen,
{
int erv = 0;
OSSL_PARAM params[3], *p = params;
size_t lsslen = 0;
size_t lsslen = 0, lenclen = 0;
EVP_PKEY_CTX *pctx = NULL;
EVP_PKEY *pkR = NULL;
const OSSL_HPKE_KEM_INFO *kem_info = NULL;
if (ctx == NULL || enc == NULL || enclen == NULL || *enclen == 0
|| pub == NULL || publen == 0) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_INTERNAL_ERROR);
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_INVALID_ARGUMENT);
return 0;
}
if (ctx->shared_secret != NULL) {
@ -507,10 +508,15 @@ static int hpke_encap(OSSL_HPKE_CTX *ctx, unsigned char *enc, size_t *enclen,
goto err;
}
}
if (EVP_PKEY_encapsulate(pctx, NULL, enclen, NULL, &lsslen) != 1) {
lenclen = *enclen;
if (EVP_PKEY_encapsulate(pctx, NULL, &lenclen, NULL, &lsslen) != 1) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_INTERNAL_ERROR);
goto err;
}
if (lenclen > *enclen) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_INVALID_ARGUMENT);
goto err;
}
ctx->shared_secret = OPENSSL_malloc(lsslen);
if (ctx->shared_secret == NULL)
goto err;
@ -550,7 +556,7 @@ static int hpke_decap(OSSL_HPKE_CTX *ctx,
size_t lsslen = 0;
if (ctx == NULL || enc == NULL || enclen == 0 || priv == NULL) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_INTERNAL_ERROR);
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_INVALID_ARGUMENT);
return 0;
}
if (ctx->shared_secret != NULL) {
@ -647,8 +653,6 @@ static int hpke_do_middle(OSSL_HPKE_CTX *ctx,
unsigned char ks_context[OSSL_HPKE_MAXSIZE];
size_t halflen = 0;
size_t pskidlen = 0;
size_t psk_hashlen = OSSL_HPKE_MAXSIZE;
unsigned char psk_hash[OSSL_HPKE_MAXSIZE];
const OSSL_HPKE_AEAD_INFO *aead_info = NULL;
const OSSL_HPKE_KDF_INFO *kdf_info = NULL;
size_t secretlen = OSSL_HPKE_MAXSIZE;
@ -659,7 +663,7 @@ static int hpke_do_middle(OSSL_HPKE_CTX *ctx,
/* only let this be done once */
if (ctx->exportersec != NULL) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_INTERNAL_ERROR);
ERR_raise(ERR_LIB_CRYPTO, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
return 0;
}
if (ossl_HPKE_KEM_INFO_find_id(ctx->suite.kem_id) == NULL) {
@ -690,7 +694,7 @@ static int hpke_do_middle(OSSL_HPKE_CTX *ctx,
if (ctx->mode == OSSL_HPKE_MODE_PSK
|| ctx->mode == OSSL_HPKE_MODE_PSKAUTH) {
if (ctx->psk == NULL || ctx->psklen == 0 || ctx->pskid == NULL) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_INTERNAL_ERROR);
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_INVALID_ARGUMENT);
return 0;
}
}
@ -707,6 +711,7 @@ static int hpke_do_middle(OSSL_HPKE_CTX *ctx,
suitebuf[3] = ctx->suite.kdf_id % 256;
suitebuf[4] = ctx->suite.aead_id / 256;
suitebuf[5] = ctx->suite.aead_id % 256;
/* Extract and Expand variously... */
if (ossl_hpke_labeled_extract(kctx, ks_context + 1, halflen,
NULL, 0, OSSL_HPKE_SEC51LABEL,
suitebuf, sizeof(suitebuf),
@ -724,16 +729,6 @@ static int hpke_do_middle(OSSL_HPKE_CTX *ctx,
goto err;
}
ks_contextlen = 1 + 2 * halflen;
/* Extract and Expand variously... */
psk_hashlen = halflen;
if (ossl_hpke_labeled_extract(kctx, psk_hash, psk_hashlen,
NULL, 0, OSSL_HPKE_SEC51LABEL,
suitebuf, sizeof(suitebuf),
OSSL_HPKE_PSK_HASH_LABEL,
ctx->psk, ctx->psklen) != 1) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_INTERNAL_ERROR);
goto err;
}
secretlen = kdf_info->Nh;
if (secretlen > OSSL_HPKE_MAXSIZE) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_INTERNAL_ERROR);
@ -791,7 +786,6 @@ static int hpke_do_middle(OSSL_HPKE_CTX *ctx,
err:
OPENSSL_cleanse(ks_context, OSSL_HPKE_MAXSIZE);
OPENSSL_cleanse(psk_hash, OSSL_HPKE_MAXSIZE);
OPENSSL_cleanse(secret, OSSL_HPKE_MAXSIZE);
EVP_KDF_CTX_free(kctx);
return erv;
@ -877,17 +871,25 @@ int OSSL_HPKE_CTX_set1_psk(OSSL_HPKE_CTX *ctx,
const unsigned char *psk, size_t psklen)
{
if (ctx == NULL || pskid == NULL || psk == NULL || psklen == 0) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_NULL_PARAMETER);
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_INVALID_ARGUMENT);
return 0;
}
if (psklen > OSSL_HPKE_MAX_PARMLEN) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_INVALID_ARGUMENT);
return 0;
}
if (psklen < OSSL_HPKE_MIN_PSKLEN) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_INVALID_ARGUMENT);
return 0;
}
if (strlen(pskid) > OSSL_HPKE_MAX_PARMLEN) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_INVALID_ARGUMENT);
return 0;
}
if (strlen(pskid) == 0) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_INVALID_ARGUMENT);
return 0;
}
if (ctx->mode != OSSL_HPKE_MODE_PSK
&& ctx->mode != OSSL_HPKE_MODE_PSKAUTH) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_INVALID_ARGUMENT);
@ -1057,10 +1059,11 @@ int OSSL_HPKE_encap(OSSL_HPKE_CTX *ctx,
const unsigned char *info, size_t infolen)
{
int erv = 1;
size_t minenc = 0;
if (ctx == NULL || enc == NULL || enclen == NULL || *enclen == 0
|| pub == NULL || publen == 0) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_NULL_PARAMETER);
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_INVALID_ARGUMENT);
return 0;
}
if (ctx->role != OSSL_HPKE_ROLE_SENDER) {
@ -1071,6 +1074,15 @@ int OSSL_HPKE_encap(OSSL_HPKE_CTX *ctx,
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_INVALID_ARGUMENT);
return 0;
}
if (infolen > 0 && info == NULL) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_INVALID_ARGUMENT);
return 0;
}
minenc = OSSL_HPKE_get_public_encap_size(ctx->suite);
if (minenc == 0 || minenc > *enclen) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_INVALID_ARGUMENT);
return 0;
}
if (ctx->shared_secret != NULL) {
/* only allow one encap per OSSL_HPKE_CTX */
ERR_raise(ERR_LIB_CRYPTO, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
@ -1095,9 +1107,10 @@ int OSSL_HPKE_decap(OSSL_HPKE_CTX *ctx,
const unsigned char *info, size_t infolen)
{
int erv = 1;
size_t minenc = 0;
if (ctx == NULL || enc == NULL || enclen == 0 || recippriv == NULL) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_NULL_PARAMETER);
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_INVALID_ARGUMENT);
return 0;
}
if (ctx->role != OSSL_HPKE_ROLE_RECEIVER) {
@ -1108,6 +1121,15 @@ int OSSL_HPKE_decap(OSSL_HPKE_CTX *ctx,
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_INVALID_ARGUMENT);
return 0;
}
if (infolen > 0 && info == NULL) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_INVALID_ARGUMENT);
return 0;
}
minenc = OSSL_HPKE_get_public_encap_size(ctx->suite);
if (minenc == 0 || minenc > enclen) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_INVALID_ARGUMENT);
return 0;
}
if (ctx->shared_secret != NULL) {
/* only allow one encap per OSSL_HPKE_CTX */
ERR_raise(ERR_LIB_CRYPTO, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
@ -1137,7 +1159,7 @@ int OSSL_HPKE_seal(OSSL_HPKE_CTX *ctx,
if (ctx == NULL || ct == NULL || ctlen == NULL || *ctlen == 0
|| pt == NULL || ptlen == 0) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_NULL_PARAMETER);
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_INVALID_ARGUMENT);
return 0;
}
if (ctx->role != OSSL_HPKE_ROLE_SENDER) {
@ -1150,7 +1172,7 @@ int OSSL_HPKE_seal(OSSL_HPKE_CTX *ctx,
}
if (ctx->key == NULL || ctx->nonce == NULL) {
/* need to have done an encap first, info can be NULL */
ERR_raise(ERR_LIB_CRYPTO, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_INVALID_ARGUMENT);
return 0;
}
seqlen = hpke_seqnonce2buf(ctx, seqbuf, sizeof(seqbuf));
@ -1179,7 +1201,7 @@ int OSSL_HPKE_open(OSSL_HPKE_CTX *ctx,
if (ctx == NULL || pt == NULL || ptlen == NULL || *ptlen == 0
|| ct == NULL || ctlen == 0) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_NULL_PARAMETER);
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_INVALID_ARGUMENT);
return 0;
}
if (ctx->role != OSSL_HPKE_ROLE_RECEIVER) {
@ -1192,7 +1214,7 @@ int OSSL_HPKE_open(OSSL_HPKE_CTX *ctx,
}
if (ctx->key == NULL || ctx->nonce == NULL) {
/* need to have done an encap first, info can be NULL */
ERR_raise(ERR_LIB_CRYPTO, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_INVALID_ARGUMENT);
return 0;
}
seqlen = hpke_seqnonce2buf(ctx, seqbuf, sizeof(seqbuf));
@ -1220,14 +1242,18 @@ int OSSL_HPKE_export(OSSL_HPKE_CTX *ctx,
const char *mdname = NULL;
const OSSL_HPKE_KDF_INFO *kdf_info = NULL;
if (ctx == NULL) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_NULL_PARAMETER);
if (ctx == NULL || secret == NULL || secretlen == 0) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_INVALID_ARGUMENT);
return 0;
}
if (labellen > OSSL_HPKE_MAX_PARMLEN) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_INVALID_ARGUMENT);
return 0;
}
if (labellen > 0 && label == NULL) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_INVALID_ARGUMENT);
return 0;
}
if (ctx->exportersec == NULL) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
return 0;
@ -1274,7 +1300,7 @@ int OSSL_HPKE_keygen(OSSL_HPKE_SUITE suite,
OSSL_PARAM params[3], *p = params;
if (pub == NULL || publen == NULL || *publen == 0 || priv == NULL) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_NULL_PARAMETER);
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_INVALID_ARGUMENT);
return 0;
}
if (hpke_suite_check(suite, &kem_info, NULL, NULL) != 1) {
@ -1348,7 +1374,7 @@ int OSSL_HPKE_get_grease_value(const OSSL_HPKE_SUITE *suite_in,
if (enc == NULL || enclen == 0
|| ct == NULL || ctlen == 0 || suite == NULL) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_NULL_PARAMETER);
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_INVALID_ARGUMENT);
return 0;
}
if (suite_in == NULL) {

32
crypto/hpke/hpke_util.c
View File

@ -17,9 +17,11 @@
#include <openssl/sha.h>
#include <openssl/rand.h>
#include "crypto/ecx.h"
#include "crypto/rand.h"
#include "internal/hpke_util.h"
#include "internal/packet.h"
#include "internal/nelem.h"
#include "internal/common.h"
/*
* Delimiter used in OSSL_HPKE_str2suite
@ -189,12 +191,12 @@ const OSSL_HPKE_KEM_INFO *ossl_HPKE_KEM_INFO_find_id(uint16_t kemid)
const OSSL_HPKE_KEM_INFO *ossl_HPKE_KEM_INFO_find_random(OSSL_LIB_CTX *ctx)
{
unsigned char rval = 0;
int sz = OSSL_NELEM(hpke_kem_tab);
uint32_t rval = 0;
int err = 0;
size_t sz = OSSL_NELEM(hpke_kem_tab);
if (RAND_bytes_ex(ctx, &rval, sizeof(rval), 0) <= 0)
return NULL;
return &hpke_kem_tab[rval % sz];
rval = ossl_rand_uniform_uint32(ctx, sz, &err);
return (err == 1 ? NULL : &hpke_kem_tab[rval]);
}
const OSSL_HPKE_KDF_INFO *ossl_HPKE_KDF_INFO_find_id(uint16_t kdfid)
@ -211,12 +213,12 @@ const OSSL_HPKE_KDF_INFO *ossl_HPKE_KDF_INFO_find_id(uint16_t kdfid)
const OSSL_HPKE_KDF_INFO *ossl_HPKE_KDF_INFO_find_random(OSSL_LIB_CTX *ctx)
{
unsigned char rval = 0;
int sz = OSSL_NELEM(hpke_kdf_tab);
uint32_t rval = 0;
int err = 0;
size_t sz = OSSL_NELEM(hpke_kdf_tab);
if (RAND_bytes_ex(ctx, &rval, sizeof(rval), 0) <= 0)
return NULL;
return &hpke_kdf_tab[rval % sz];
rval = ossl_rand_uniform_uint32(ctx, sz, &err);
return (err == 1 ? NULL : &hpke_kdf_tab[rval]);
}
const OSSL_HPKE_AEAD_INFO *ossl_HPKE_AEAD_INFO_find_id(uint16_t aeadid)
@ -233,13 +235,13 @@ const OSSL_HPKE_AEAD_INFO *ossl_HPKE_AEAD_INFO_find_id(uint16_t aeadid)
const OSSL_HPKE_AEAD_INFO *ossl_HPKE_AEAD_INFO_find_random(OSSL_LIB_CTX *ctx)
{
unsigned char rval = 0;
uint32_t rval = 0;
int err = 0;
/* the minus 1 below is so we don't pick the EXPORTONLY codepoint */
int sz = OSSL_NELEM(hpke_aead_tab) - 1;
size_t sz = OSSL_NELEM(hpke_aead_tab) - 1;
if (RAND_bytes_ex(ctx, &rval, sizeof(rval), 0) <= 0)
return NULL;
return &hpke_aead_tab[rval % sz];
rval = ossl_rand_uniform_uint32(ctx, sz, &err);
return (err == 1 ? NULL : &hpke_aead_tab[rval]);
}
static int kdf_derive(EVP_KDF_CTX *kctx,

4
doc/man3/OSSL_HPKE_CTX_new.pod
View File

@ -222,6 +222,10 @@ functions below. The constant I<OSSL_HPKE_MAX_PARMLEN> is defined as the limit
of this value. (We chose 66 octets so that we can validate all the test
vectors present in RFC9180, Appendix A.)
In accordance with RFC9180, section 9.5, we define a constant
I<OSSL_HPKE_MIN_PSKLEN> with a value of 32 for the minimum length of a
pre-shared key, passed in I<psklen>.
While RFC9180 also RECOMMENDS a 64 octet limit for the I<infolen> parameter,
that is not sufficient for TLS Encrypted ClientHello (ECH) processing, so we
enforce a limit of I<OSSL_HPKE_MAX_INFOLEN> with a value of 1024 as the limit

1
include/openssl/evp.h
View File

@ -35,6 +35,7 @@
# define EVP_MAX_KEY_LENGTH 64
# define EVP_MAX_IV_LENGTH 16
# define EVP_MAX_BLOCK_LENGTH 32
# define EVP_MAX_AEAD_TAG_LENGTH 16
# define PKCS5_SALT_LEN 8
/* Default PKCS#5 iteration count */

1
include/openssl/hpke.h
View File

@ -26,6 +26,7 @@
* Appendix A.6.1 with a 66 octet IKM so we'll allow that.
*/
# define OSSL_HPKE_MAX_PARMLEN 66
# define OSSL_HPKE_MIN_PSKLEN 32
# define OSSL_HPKE_MAX_INFOLEN 1024
/*

13
test/hpke_test.c
View File

@ -1319,8 +1319,8 @@ static int test_hpke_oddcalls(void)
OSSL_HPKE_CTX *rctx = NULL;
unsigned char plain[] = "quick brown fox";
size_t plainlen = sizeof(plain);
unsigned char enc[OSSL_HPKE_TSTSIZE];
size_t enclen = sizeof(enc);
unsigned char enc[OSSL_HPKE_TSTSIZE], smallenc[10];
size_t enclen = sizeof(enc), smallenclen = sizeof(smallenc);
unsigned char cipher[OSSL_HPKE_TSTSIZE];
size_t cipherlen = sizeof(cipher);
unsigned char clear[OSSL_HPKE_TSTSIZE];
@ -1471,6 +1471,15 @@ static int test_hpke_oddcalls(void)
/* encap with too big info */
if (!TEST_false(OSSL_HPKE_encap(ctx, enc, &enclen, pub, 1, info, -1)))
goto end;
/* encap with NULL info & non-zero infolen */
if (!TEST_false(OSSL_HPKE_encap(ctx, enc, &enclen, pub, 1, NULL, 1)))
goto end;
/* encap with non-NULL info & zero infolen */
if (!TEST_false(OSSL_HPKE_encap(ctx, enc, &enclen, pub, 1, info, 0)))
goto end;
/* encap with too small enc */
if (!TEST_false(OSSL_HPKE_encap(ctx, smallenc, &smallenclen, pub, 1, NULL, 0)))
goto end;
/* good encap */
if (!TEST_true(OSSL_HPKE_encap(ctx, enc, &enclen, pub, publen, NULL, 0)))
goto end;