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# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.
INCLUDES = """
#ifdef _WIN32
#include <Wincrypt.h>
#else
#include <fcntl.h>
#include <unistd.h>
#endif
"""
TYPES = """
static const char *const Cryptography_urandom_engine_name;
static const char *const Cryptography_urandom_engine_id;
"""
FUNCTIONS = """
int Cryptography_add_urandom_engine(void);
"""
MACROS = """
"""
CUSTOMIZATIONS = """
static const char *Cryptography_urandom_engine_id= "urandom";
static const char *Cryptography_urandom_engine_name = "urandom_engine";
#ifndef _WIN32
static int urandom_fd = -1;
static int urandom_rand_bytes(unsigned char *buffer, int size) {
ssize_t n;
while (0 < size) {
do {
n = read(urandom_fd, buffer, (size_t)size);
} while (n < 0 && errno == EINTR);
if (n <= 0) {
return 0;
break;
}
buffer += n;
size -= n;
}
return 1;
}
static int urandom_rand_status(void) {
return 1;
}
static int urandom_init(ENGINE *e) {
urandom_fd = open("/dev/urandom", O_RDONLY);
if (urandom_fd > -1) {
return 1;
} else {
return 0;
}
}
static int urandom_finish(ENGINE *e) {
int n;
do {
n = close(urandom_fd);
} while (n < 0 && errno == EINTR);
if (n < 0) {
return 0;
} else {
return 1;
}
}
#endif
#ifdef _WIN32
/* This handle is never explicitly released. Instead, the operating
system will release it when the process terminates. */
static HCRYPTPROV hCryptProv = 0;
static int urandom_init(ENGINE *e) {
if (CryptAcquireContext(&hCryptProv, NULL, NULL,
PROV_RSA_FULL, CRYPT_VERIFYCONTEXT)) {
return 1;
} else {
return 0;
}
}
static int urandom_rand_bytes(unsigned char *buffer, int size) {
size_t chunk;
if (hCryptProv == 0) {
return 0;
}
while (size > 0) {
chunk = size;
if (!CryptGenRandom(hCryptProv, (DWORD)chunk, buffer)) {
return 0;
}
buffer += chunk;
size -= chunk;
}
return 1;
}
static int urandom_finish(ENGINE *e) {
return 1;
}
static int urandom_rand_status(void) {
return 1;
}
#endif /* MS_WINDOWS */
static RAND_METHOD urandom_rand = {
NULL,
urandom_rand_bytes,
NULL,
NULL,
urandom_rand_bytes,
urandom_rand_status,
};
int Cryptography_add_urandom_engine(void) {
ENGINE *e = ENGINE_new();
if (e == NULL) {
return 0;
}
if(!ENGINE_set_id(e, Cryptography_urandom_engine_id) ||
!ENGINE_set_name(e, Cryptography_urandom_engine_name) ||
!ENGINE_set_RAND(e, &urandom_rand) ||
!ENGINE_set_init_function(e, urandom_init) ||
!ENGINE_set_finish_function(e, urandom_finish)) {
return 0;
}
if (!ENGINE_add(e)) {
ENGINE_free(e);
return 0;
}
if (!ENGINE_free(e)) {
return 0;
}
return 1;
}
"""
CONDITIONAL_NAMES = {}
|
