diff options
Diffstat (limited to 'third_party/heimdal/lib/hcrypto/rand-unix.c')
| -rw-r--r-- | third_party/heimdal/lib/hcrypto/rand-unix.c | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/third_party/heimdal/lib/hcrypto/rand-unix.c b/third_party/heimdal/lib/hcrypto/rand-unix.c new file mode 100644 index 0000000..2d6013e --- /dev/null +++ b/third_party/heimdal/lib/hcrypto/rand-unix.c @@ -0,0 +1,175 @@ +/* + * Copyright (c) 2006 Kungliga Tekniska Högskolan + * (Royal Institute of Technology, Stockholm, Sweden). + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * 3. Neither the name of the Institute nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <config.h> +#include <roken.h> + +#include <rand.h> +#include <heim_threads.h> + +#include "randi.h" + +/* + * Unix /dev/random + */ + +int +_hc_unix_device_fd(int flags, const char **fn) +{ + static const char *rnd_devices[] = { + "/dev/urandom", + "/dev/random", + "/dev/srandom", + "/dev/arandom", + NULL + }; + const char **p; + + for(p = rnd_devices; *p; p++) { + int fd = open(*p, flags | O_NDELAY); + if(fd >= 0) { + if (fn) + *fn = *p; + rk_cloexec(fd); + return fd; + } + } + return -1; +} + +static void +unix_seed(const void *p, int size) +{ + const unsigned char *indata = p; + ssize_t count; + int fd; + + if (size < 0) + return; + else if (size == 0) + return; + + fd = _hc_unix_device_fd(O_RDONLY, NULL); + if (fd < 0) + return; + + while (size > 0) { + count = write(fd, indata, size); + if (count < 0 && errno == EINTR) + continue; + else if (count <= 0) { + close(fd); + return; + } + indata += count; + size -= count; + } + close(fd); +} + + +static int +unix_bytes(unsigned char *outdata, int size) +{ + ssize_t count; + int fd; + + if (size < 0) + return 0; + else if (size == 0) + return 1; + + fd = _hc_unix_device_fd(O_RDONLY, NULL); + if (fd < 0) + return 0; + + while (size > 0) { + count = read(fd, outdata, size); + if (count < 0 && errno == EINTR) + continue; + else if (count <= 0) { + close(fd); + return 0; + } + outdata += count; + size -= count; + } + close(fd); + + return 1; +} + +static void +unix_cleanup(void) +{ +} + +static void +unix_add(const void *indata, int size, double entropi) +{ + unix_seed(indata, size); +} + +static int +unix_pseudorand(unsigned char *outdata, int size) +{ + return unix_bytes(outdata, size); +} + +static int +unix_status(void) +{ + int fd; + + fd = _hc_unix_device_fd(O_RDONLY, NULL); + if (fd < 0) + return 0; + close(fd); + + return 1; +} + +const RAND_METHOD hc_rand_unix_method = { + unix_seed, + unix_bytes, + unix_cleanup, + unix_add, + unix_pseudorand, + unix_status +}; + +const RAND_METHOD * +RAND_unix_method(void) +{ + return &hc_rand_unix_method; +} |