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openssl/engines/e_ossltest.c
Matt Caswell 38fc02a708 Update copyright year 
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/15801)
2021-06-17 13:24:59 +01:00

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/*
* Copyright 2015-2021 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
/*
* This is the OSSLTEST engine. It provides deliberately crippled digest
* implementations for test purposes. It is highly insecure and must NOT be
* used for any purpose except testing
*/
/* We need to use some engine deprecated APIs */
#define OPENSSL_SUPPRESS_DEPRECATED
/*
* SHA low level APIs are deprecated for public use, but still ok for
* internal use. Note, that due to symbols not being exported, only the
* #defines and type definitions can be accessed, function calls are not
* available. The digest lengths, block sizes and sizeof(CTX) are used herein
* for several different digests.
*/
#include "internal/deprecated.h"
#include <stdio.h>
#include <string.h>
#include <openssl/engine.h>
#include <openssl/sha.h>
#include <openssl/md5.h>
#include <openssl/rsa.h>
#include <openssl/evp.h>
#include <openssl/modes.h>
#include <openssl/aes.h>
#include <openssl/rand.h>
#include <openssl/crypto.h>
#include <openssl/pem.h>
#include "e_ossltest_err.c"
#ifdef _WIN32
# define strncasecmp _strnicmp
#endif
/* Engine Id and Name */
static const char *engine_ossltest_id = "ossltest";
static const char *engine_ossltest_name = "OpenSSL Test engine support";
/* Engine Lifetime functions */
static int ossltest_destroy(ENGINE *e);
static int ossltest_init(ENGINE *e);
static int ossltest_finish(ENGINE *e);
void ENGINE_load_ossltest(void);
/* Set up digests */
static int ossltest_digests(ENGINE *e, const EVP_MD **digest,
const int **nids, int nid);
static const RAND_METHOD *ossltest_rand_method(void);
/* MD5 */
static int digest_md5_init(EVP_MD_CTX *ctx);
static int digest_md5_update(EVP_MD_CTX *ctx, const void *data,
size_t count);
static int digest_md5_final(EVP_MD_CTX *ctx, unsigned char *md);
static EVP_MD *_hidden_md5_md = NULL;
static const EVP_MD *digest_md5(void)
{
if (_hidden_md5_md == NULL) {
EVP_MD *md;
if ((md = EVP_MD_meth_new(NID_md5, NID_md5WithRSAEncryption)) == NULL
|| !EVP_MD_meth_set_result_size(md, MD5_DIGEST_LENGTH)
|| !EVP_MD_meth_set_input_blocksize(md, MD5_CBLOCK)
|| !EVP_MD_meth_set_app_datasize(md,
sizeof(EVP_MD *) + sizeof(MD5_CTX))
|| !EVP_MD_meth_set_flags(md, 0)
|| !EVP_MD_meth_set_init(md, digest_md5_init)
|| !EVP_MD_meth_set_update(md, digest_md5_update)
|| !EVP_MD_meth_set_final(md, digest_md5_final)) {
EVP_MD_meth_free(md);
md = NULL;
}
_hidden_md5_md = md;
}
return _hidden_md5_md;
}
/* SHA1 */
static int digest_sha1_init(EVP_MD_CTX *ctx);
static int digest_sha1_update(EVP_MD_CTX *ctx, const void *data,
size_t count);
static int digest_sha1_final(EVP_MD_CTX *ctx, unsigned char *md);
static EVP_MD *_hidden_sha1_md = NULL;
static const EVP_MD *digest_sha1(void)
{
if (_hidden_sha1_md == NULL) {
EVP_MD *md;
if ((md = EVP_MD_meth_new(NID_sha1, NID_sha1WithRSAEncryption)) == NULL
|| !EVP_MD_meth_set_result_size(md, SHA_DIGEST_LENGTH)
|| !EVP_MD_meth_set_input_blocksize(md, SHA_CBLOCK)
|| !EVP_MD_meth_set_app_datasize(md,
sizeof(EVP_MD *) + sizeof(SHA_CTX))
|| !EVP_MD_meth_set_flags(md, EVP_MD_FLAG_DIGALGID_ABSENT)
|| !EVP_MD_meth_set_init(md, digest_sha1_init)
|| !EVP_MD_meth_set_update(md, digest_sha1_update)
|| !EVP_MD_meth_set_final(md, digest_sha1_final)) {
EVP_MD_meth_free(md);
md = NULL;
}
_hidden_sha1_md = md;
}
return _hidden_sha1_md;
}
/* SHA256 */
static int digest_sha256_init(EVP_MD_CTX *ctx);
static int digest_sha256_update(EVP_MD_CTX *ctx, const void *data,
size_t count);
static int digest_sha256_final(EVP_MD_CTX *ctx, unsigned char *md);
static EVP_MD *_hidden_sha256_md = NULL;
static const EVP_MD *digest_sha256(void)
{
if (_hidden_sha256_md == NULL) {
EVP_MD *md;
if ((md = EVP_MD_meth_new(NID_sha256, NID_sha256WithRSAEncryption)) == NULL
|| !EVP_MD_meth_set_result_size(md, SHA256_DIGEST_LENGTH)
|| !EVP_MD_meth_set_input_blocksize(md, SHA256_CBLOCK)
|| !EVP_MD_meth_set_app_datasize(md,
sizeof(EVP_MD *) + sizeof(SHA256_CTX))
|| !EVP_MD_meth_set_flags(md, EVP_MD_FLAG_DIGALGID_ABSENT)
|| !EVP_MD_meth_set_init(md, digest_sha256_init)
|| !EVP_MD_meth_set_update(md, digest_sha256_update)
|| !EVP_MD_meth_set_final(md, digest_sha256_final)) {
EVP_MD_meth_free(md);
md = NULL;
}
_hidden_sha256_md = md;
}
return _hidden_sha256_md;
}
/* SHA384/SHA512 */
static int digest_sha384_init(EVP_MD_CTX *ctx);
static int digest_sha384_update(EVP_MD_CTX *ctx, const void *data,
size_t count);
static int digest_sha384_final(EVP_MD_CTX *ctx, unsigned char *md);
static int digest_sha512_init(EVP_MD_CTX *ctx);
static int digest_sha512_update(EVP_MD_CTX *ctx, const void *data,
size_t count);
static int digest_sha512_final(EVP_MD_CTX *ctx, unsigned char *md);
static EVP_MD *_hidden_sha384_md = NULL;
static const EVP_MD *digest_sha384(void)
{
if (_hidden_sha384_md == NULL) {
EVP_MD *md;
if ((md = EVP_MD_meth_new(NID_sha384, NID_sha384WithRSAEncryption)) == NULL
|| !EVP_MD_meth_set_result_size(md, SHA384_DIGEST_LENGTH)
|| !EVP_MD_meth_set_input_blocksize(md, SHA512_CBLOCK)
|| !EVP_MD_meth_set_app_datasize(md,
sizeof(EVP_MD *) + sizeof(SHA512_CTX))
|| !EVP_MD_meth_set_flags(md, EVP_MD_FLAG_DIGALGID_ABSENT)
|| !EVP_MD_meth_set_init(md, digest_sha384_init)
|| !EVP_MD_meth_set_update(md, digest_sha384_update)
|| !EVP_MD_meth_set_final(md, digest_sha384_final)) {
EVP_MD_meth_free(md);
md = NULL;
}
_hidden_sha384_md = md;
}
return _hidden_sha384_md;
}
static EVP_MD *_hidden_sha512_md = NULL;
static const EVP_MD *digest_sha512(void)
{
if (_hidden_sha512_md == NULL) {
EVP_MD *md;
if ((md = EVP_MD_meth_new(NID_sha512, NID_sha512WithRSAEncryption)) == NULL
|| !EVP_MD_meth_set_result_size(md, SHA512_DIGEST_LENGTH)
|| !EVP_MD_meth_set_input_blocksize(md, SHA512_CBLOCK)
|| !EVP_MD_meth_set_app_datasize(md,
sizeof(EVP_MD *) + sizeof(SHA512_CTX))
|| !EVP_MD_meth_set_flags(md, EVP_MD_FLAG_DIGALGID_ABSENT)
|| !EVP_MD_meth_set_init(md, digest_sha512_init)
|| !EVP_MD_meth_set_update(md, digest_sha512_update)
|| !EVP_MD_meth_set_final(md, digest_sha512_final)) {
EVP_MD_meth_free(md);
md = NULL;
}
_hidden_sha512_md = md;
}
return _hidden_sha512_md;
}
static void destroy_digests(void)
{
EVP_MD_meth_free(_hidden_md5_md);
_hidden_md5_md = NULL;
EVP_MD_meth_free(_hidden_sha1_md);
_hidden_sha1_md = NULL;
EVP_MD_meth_free(_hidden_sha256_md);
_hidden_sha256_md = NULL;
EVP_MD_meth_free(_hidden_sha384_md);
_hidden_sha384_md = NULL;
EVP_MD_meth_free(_hidden_sha512_md);
_hidden_sha512_md = NULL;
}
static int ossltest_digest_nids(const int **nids)
{
static int digest_nids[6] = { 0, 0, 0, 0, 0, 0 };
static int pos = 0;
static int init = 0;
if (!init) {
const EVP_MD *md;
if ((md = digest_md5()) != NULL)
digest_nids[pos++] = EVP_MD_get_type(md);
if ((md = digest_sha1()) != NULL)
digest_nids[pos++] = EVP_MD_get_type(md);
if ((md = digest_sha256()) != NULL)
digest_nids[pos++] = EVP_MD_get_type(md);
if ((md = digest_sha384()) != NULL)
digest_nids[pos++] = EVP_MD_get_type(md);
if ((md = digest_sha512()) != NULL)
digest_nids[pos++] = EVP_MD_get_type(md);
digest_nids[pos] = 0;
init = 1;
}
*nids = digest_nids;
return pos;
}
/* Setup ciphers */
static int ossltest_ciphers(ENGINE *, const EVP_CIPHER **,
const int **, int);
static int ossltest_cipher_nids[] = {
NID_aes_128_cbc, NID_aes_128_gcm, 0
};
/* AES128 */
int ossltest_aes128_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
const unsigned char *iv, int enc);
int ossltest_aes128_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
const unsigned char *in, size_t inl);
int ossltest_aes128_gcm_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
const unsigned char *iv, int enc);
int ossltest_aes128_gcm_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
const unsigned char *in, size_t inl);
static int ossltest_aes128_gcm_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg,
void *ptr);
static EVP_CIPHER *_hidden_aes_128_cbc = NULL;
static const EVP_CIPHER *ossltest_aes_128_cbc(void)
{
if (_hidden_aes_128_cbc == NULL
&& ((_hidden_aes_128_cbc = EVP_CIPHER_meth_new(NID_aes_128_cbc,
16 /* block size */,
16 /* key len */)) == NULL
|| !EVP_CIPHER_meth_set_iv_length(_hidden_aes_128_cbc,16)
|| !EVP_CIPHER_meth_set_flags(_hidden_aes_128_cbc,
EVP_CIPH_FLAG_DEFAULT_ASN1
| EVP_CIPH_CBC_MODE)
|| !EVP_CIPHER_meth_set_init(_hidden_aes_128_cbc,
ossltest_aes128_init_key)
|| !EVP_CIPHER_meth_set_do_cipher(_hidden_aes_128_cbc,
ossltest_aes128_cbc_cipher)
|| !EVP_CIPHER_meth_set_impl_ctx_size(_hidden_aes_128_cbc,
EVP_CIPHER_impl_ctx_size(EVP_aes_128_cbc())))) {
EVP_CIPHER_meth_free(_hidden_aes_128_cbc);
_hidden_aes_128_cbc = NULL;
}
return _hidden_aes_128_cbc;
}
static EVP_CIPHER *_hidden_aes_128_gcm = NULL;
#define AES_GCM_FLAGS (EVP_CIPH_FLAG_DEFAULT_ASN1 \
| EVP_CIPH_CUSTOM_IV | EVP_CIPH_FLAG_CUSTOM_CIPHER \
| EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CTRL_INIT \
| EVP_CIPH_CUSTOM_COPY |EVP_CIPH_FLAG_AEAD_CIPHER \
| EVP_CIPH_GCM_MODE)
static const EVP_CIPHER *ossltest_aes_128_gcm(void)
{
if (_hidden_aes_128_gcm == NULL
&& ((_hidden_aes_128_gcm = EVP_CIPHER_meth_new(NID_aes_128_gcm,
1 /* block size */,
16 /* key len */)) == NULL
|| !EVP_CIPHER_meth_set_iv_length(_hidden_aes_128_gcm,12)
|| !EVP_CIPHER_meth_set_flags(_hidden_aes_128_gcm, AES_GCM_FLAGS)
|| !EVP_CIPHER_meth_set_init(_hidden_aes_128_gcm,
ossltest_aes128_gcm_init_key)
|| !EVP_CIPHER_meth_set_do_cipher(_hidden_aes_128_gcm,
ossltest_aes128_gcm_cipher)
|| !EVP_CIPHER_meth_set_ctrl(_hidden_aes_128_gcm,
ossltest_aes128_gcm_ctrl)
|| !EVP_CIPHER_meth_set_impl_ctx_size(_hidden_aes_128_gcm,
EVP_CIPHER_impl_ctx_size(EVP_aes_128_gcm())))) {
EVP_CIPHER_meth_free(_hidden_aes_128_gcm);
_hidden_aes_128_gcm = NULL;
}
return _hidden_aes_128_gcm;
}
static void destroy_ciphers(void)
{
EVP_CIPHER_meth_free(_hidden_aes_128_cbc);
EVP_CIPHER_meth_free(_hidden_aes_128_gcm);
_hidden_aes_128_cbc = NULL;
}
/* Key loading */
static EVP_PKEY *load_key(ENGINE *eng, const char *key_id, int pub,
UI_METHOD *ui_method, void *ui_data)
{
BIO *in;
EVP_PKEY *key;
if (strncasecmp(key_id, "ot:", 3) != 0)
return NULL;
key_id += 3;
fprintf(stderr, "[ossltest]Loading %s key %s\n",
pub ? "Public" : "Private", key_id);
in = BIO_new_file(key_id, "r");
if (!in)
return NULL;
if (pub)
key = PEM_read_bio_PUBKEY(in, NULL, 0, NULL);
else
key = PEM_read_bio_PrivateKey(in, NULL, 0, NULL);
BIO_free(in);
return key;
}
static EVP_PKEY *ossltest_load_privkey(ENGINE *eng, const char *key_id,
UI_METHOD *ui_method, void *ui_data)
{
return load_key(eng, key_id, 0, ui_method, ui_data);
}
static EVP_PKEY *ossltest_load_pubkey(ENGINE *eng, const char *key_id,
UI_METHOD *ui_method, void *ui_data)
{
return load_key(eng, key_id, 1, ui_method, ui_data);
}
static int bind_ossltest(ENGINE *e)
{
/* Ensure the ossltest error handling is set up */
ERR_load_OSSLTEST_strings();
if (!ENGINE_set_id(e, engine_ossltest_id)
|| !ENGINE_set_name(e, engine_ossltest_name)
|| !ENGINE_set_digests(e, ossltest_digests)
|| !ENGINE_set_ciphers(e, ossltest_ciphers)
|| !ENGINE_set_RAND(e, ossltest_rand_method())
|| !ENGINE_set_destroy_function(e, ossltest_destroy)
|| !ENGINE_set_load_privkey_function(e, ossltest_load_privkey)
|| !ENGINE_set_load_pubkey_function(e, ossltest_load_pubkey)
|| !ENGINE_set_init_function(e, ossltest_init)
|| !ENGINE_set_finish_function(e, ossltest_finish)) {
OSSLTESTerr(OSSLTEST_F_BIND_OSSLTEST, OSSLTEST_R_INIT_FAILED);
return 0;
}
return 1;
}
#ifndef OPENSSL_NO_DYNAMIC_ENGINE
static int bind_helper(ENGINE *e, const char *id)
{
if (id && (strcmp(id, engine_ossltest_id) != 0))
return 0;
if (!bind_ossltest(e))
return 0;
return 1;
}
IMPLEMENT_DYNAMIC_CHECK_FN()
IMPLEMENT_DYNAMIC_BIND_FN(bind_helper)
#endif
static ENGINE *engine_ossltest(void)
{
ENGINE *ret = ENGINE_new();
if (ret == NULL)
return NULL;
if (!bind_ossltest(ret)) {
ENGINE_free(ret);
return NULL;
}
return ret;
}
void ENGINE_load_ossltest(void)
{
/* Copied from eng_[openssl|dyn].c */
ENGINE *toadd = engine_ossltest();
if (!toadd)
return;
ENGINE_add(toadd);
ENGINE_free(toadd);
ERR_clear_error();
}
static int ossltest_init(ENGINE *e)
{
return 1;
}
static int ossltest_finish(ENGINE *e)
{
return 1;
}
static int ossltest_destroy(ENGINE *e)
{
destroy_digests();
destroy_ciphers();
ERR_unload_OSSLTEST_strings();
return 1;
}
static int ossltest_digests(ENGINE *e, const EVP_MD **digest,
const int **nids, int nid)
{
int ok = 1;
if (!digest) {
/* We are returning a list of supported nids */
return ossltest_digest_nids(nids);
}
/* We are being asked for a specific digest */
switch (nid) {
case NID_md5:
*digest = digest_md5();
break;
case NID_sha1:
*digest = digest_sha1();
break;
case NID_sha256:
*digest = digest_sha256();
break;
case NID_sha384:
*digest = digest_sha384();
break;
case NID_sha512:
*digest = digest_sha512();
break;
default:
ok = 0;
*digest = NULL;
break;
}
return ok;
}
static int ossltest_ciphers(ENGINE *e, const EVP_CIPHER **cipher,
const int **nids, int nid)
{
int ok = 1;
if (!cipher) {
/* We are returning a list of supported nids */
*nids = ossltest_cipher_nids;
return (sizeof(ossltest_cipher_nids) - 1)
/ sizeof(ossltest_cipher_nids[0]);
}
/* We are being asked for a specific cipher */
switch (nid) {
case NID_aes_128_cbc:
*cipher = ossltest_aes_128_cbc();
break;
case NID_aes_128_gcm:
*cipher = ossltest_aes_128_gcm();
break;
default:
ok = 0;
*cipher = NULL;
break;
}
return ok;
}
static void fill_known_data(unsigned char *md, unsigned int len)
{
unsigned int i;
for (i=0; i<len; i++) {
md[i] = (unsigned char)(i & 0xff);
}
}
/*
* MD5 implementation. We go through the motions of doing MD5 by deferring to
* the standard implementation. Then we overwrite the result with a will defined
* value, so that all "MD5" digests using the test engine always end up with
* the same value.
*/
static int digest_md5_init(EVP_MD_CTX *ctx)
{
return EVP_MD_meth_get_init(EVP_md5())(ctx);
}
static int digest_md5_update(EVP_MD_CTX *ctx, const void *data,
size_t count)
{
return EVP_MD_meth_get_update(EVP_md5())(ctx, data, count);
}
static int digest_md5_final(EVP_MD_CTX *ctx, unsigned char *md)
{
int ret = EVP_MD_meth_get_final(EVP_md5())(ctx, md);
if (ret > 0) {
fill_known_data(md, MD5_DIGEST_LENGTH);
}
return ret;
}
/*
* SHA1 implementation.
*/
static int digest_sha1_init(EVP_MD_CTX *ctx)
{
return EVP_MD_meth_get_init(EVP_sha1())(ctx);
}
static int digest_sha1_update(EVP_MD_CTX *ctx, const void *data,
size_t count)
{
return EVP_MD_meth_get_update(EVP_sha1())(ctx, data, count);
}
static int digest_sha1_final(EVP_MD_CTX *ctx, unsigned char *md)
{
int ret = EVP_MD_meth_get_final(EVP_sha1())(ctx, md);
if (ret > 0) {
fill_known_data(md, SHA_DIGEST_LENGTH);
}
return ret;
}
/*
* SHA256 implementation.
*/
static int digest_sha256_init(EVP_MD_CTX *ctx)
{
return EVP_MD_meth_get_init(EVP_sha256())(ctx);
}
static int digest_sha256_update(EVP_MD_CTX *ctx, const void *data,
size_t count)
{
return EVP_MD_meth_get_update(EVP_sha256())(ctx, data, count);
}
static int digest_sha256_final(EVP_MD_CTX *ctx, unsigned char *md)
{
int ret = EVP_MD_meth_get_final(EVP_sha256())(ctx, md);
if (ret > 0) {
fill_known_data(md, SHA256_DIGEST_LENGTH);
}
return ret;
}
/*
* SHA384 implementation.
*/
static int digest_sha384_init(EVP_MD_CTX *ctx)
{
return EVP_MD_meth_get_init(EVP_sha384())(ctx);
}
static int digest_sha384_update(EVP_MD_CTX *ctx, const void *data,
size_t count)
{
return EVP_MD_meth_get_update(EVP_sha384())(ctx, data, count);
}
static int digest_sha384_final(EVP_MD_CTX *ctx, unsigned char *md)
{
int ret = EVP_MD_meth_get_final(EVP_sha384())(ctx, md);
if (ret > 0) {
fill_known_data(md, SHA384_DIGEST_LENGTH);
}
return ret;
}
/*
* SHA512 implementation.
*/
static int digest_sha512_init(EVP_MD_CTX *ctx)
{
return EVP_MD_meth_get_init(EVP_sha512())(ctx);
}
static int digest_sha512_update(EVP_MD_CTX *ctx, const void *data,
size_t count)
{
return EVP_MD_meth_get_update(EVP_sha512())(ctx, data, count);
}
static int digest_sha512_final(EVP_MD_CTX *ctx, unsigned char *md)
{
int ret = EVP_MD_meth_get_final(EVP_sha512())(ctx, md);
if (ret > 0) {
fill_known_data(md, SHA512_DIGEST_LENGTH);
}
return ret;
}
/*
* AES128 Implementation
*/
int ossltest_aes128_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
const unsigned char *iv, int enc)
{
return EVP_CIPHER_meth_get_init(EVP_aes_128_cbc()) (ctx, key, iv, enc);
}
int ossltest_aes128_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
const unsigned char *in, size_t inl)
{
unsigned char *tmpbuf;
int ret;
tmpbuf = OPENSSL_malloc(inl);
/* OPENSSL_malloc will return NULL if inl == 0 */
if (tmpbuf == NULL && inl > 0)
return -1;
/* Remember what we were asked to encrypt */
if (tmpbuf != NULL)
memcpy(tmpbuf, in, inl);
/* Go through the motions of encrypting it */
ret = EVP_CIPHER_meth_get_do_cipher(EVP_aes_128_cbc())(ctx, out, in, inl);
/* Throw it all away and just use the plaintext as the output */
if (tmpbuf != NULL)
memcpy(out, tmpbuf, inl);
OPENSSL_free(tmpbuf);
return ret;
}
int ossltest_aes128_gcm_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
const unsigned char *iv, int enc)
{
return EVP_CIPHER_meth_get_init(EVP_aes_128_gcm()) (ctx, key, iv, enc);
}
int ossltest_aes128_gcm_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
const unsigned char *in, size_t inl)
{
unsigned char *tmpbuf = OPENSSL_malloc(inl);
/* OPENSSL_malloc will return NULL if inl == 0 */
if (tmpbuf == NULL && inl > 0)
return -1;
/* Remember what we were asked to encrypt */
if (tmpbuf != NULL)
memcpy(tmpbuf, in, inl);
/* Go through the motions of encrypting it */
EVP_CIPHER_meth_get_do_cipher(EVP_aes_128_gcm())(ctx, out, in, inl);
/* Throw it all away and just use the plaintext as the output */
if (tmpbuf != NULL && out != NULL)
memcpy(out, tmpbuf, inl);
OPENSSL_free(tmpbuf);
return inl;
}
static int ossltest_aes128_gcm_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg,
void *ptr)
{
/* Pass the ctrl down */
int ret = EVP_CIPHER_meth_get_ctrl(EVP_aes_128_gcm())(ctx, type, arg, ptr);
if (ret <= 0)
return ret;
switch(type) {
case EVP_CTRL_AEAD_GET_TAG:
/* Always give the same tag */
memset(ptr, 0, EVP_GCM_TLS_TAG_LEN);
break;
default:
break;
}
return 1;
}
static int ossltest_rand_bytes(unsigned char *buf, int num)
{
unsigned char val = 1;
while (--num >= 0)
*buf++ = val++;
return 1;
}
static int ossltest_rand_status(void)
{
return 1;
}
static const RAND_METHOD *ossltest_rand_method(void)
{
static RAND_METHOD osslt_rand_meth = {
NULL,
ossltest_rand_bytes,
NULL,
NULL,
ossltest_rand_bytes,
ossltest_rand_status
};
return &osslt_rand_meth;
}
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