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Diffstat (limited to 'source4/heimdal/lib/hcrypto/rand.c')
| -rw-r--r-- | source4/heimdal/lib/hcrypto/rand.c | 215 |
1 files changed, 215 insertions, 0 deletions
diff --git a/source4/heimdal/lib/hcrypto/rand.c b/source4/heimdal/lib/hcrypto/rand.c new file mode 100644 index 0000000000..29f2d46dba --- /dev/null +++ b/source4/heimdal/lib/hcrypto/rand.c @@ -0,0 +1,215 @@ +/* + * Copyright (c) 2006 - 2007 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. + */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +RCSID("$Id: rand.c 20126 2007-02-01 22:08:41Z lha $"); + +#include <stdio.h> +#include <stdlib.h> +#include <rand.h> +#include <randi.h> + +#include <roken.h> + +#ifndef O_BINARY +#define O_BINARY 0 +#endif + + +const static RAND_METHOD *selected_meth = NULL; + +static void +init_method(void) +{ + if (selected_meth != NULL) + return; + + if ((*hc_rand_unix_method.status)() == 1) + selected_meth = &hc_rand_unix_method; + else + selected_meth = &hc_rand_fortuna_method; +} + +void +RAND_seed(const void *indata, size_t size) +{ + init_method(); + (*selected_meth->seed)(indata, size); +} + +int +RAND_bytes(void *outdata, size_t size) +{ + init_method(); + return (*selected_meth->bytes)(outdata, size); +} + +void +RAND_cleanup(void) +{ + init_method(); + (*selected_meth->cleanup)(); +} + +void +RAND_add(const void *indata, size_t size, double entropi) +{ + init_method(); + (*selected_meth->add)(indata, size, entropi); +} + +int +RAND_pseudo_bytes(void *outdata, size_t size) +{ + init_method(); + return (*selected_meth->pseudorand)(outdata, size); +} + +int +RAND_status(void) +{ + init_method(); + return (*selected_meth->status)(); +} + +int +RAND_set_rand_method(const RAND_METHOD *meth) +{ + selected_meth = meth; + return 1; +} + +const RAND_METHOD * +RAND_get_rand_method(void) +{ + return selected_meth; +} + +int +RAND_set_rand_engine(ENGINE *engine) +{ + return 1; +} + +#define RAND_FILE_SIZE 1024 + +int +RAND_load_file(const char *filename, size_t size) +{ + unsigned char buf[128]; + size_t len; + ssize_t slen; + int fd; + + fd = open(filename, O_RDONLY | O_BINARY, 0600); + if (fd < 0) + return 0; + + len = 0; + while(len < size) { + slen = read(fd, buf, sizeof(buf)); + if (slen <= 0) + break; + RAND_seed(buf, slen); + len += slen; + } + close(fd); + + return len ? 1 : 0; +} + +int +RAND_write_file(const char *filename) +{ + unsigned char buf[128]; + size_t len; + int res = 0, fd; + + fd = open(filename, O_WRONLY | O_CREAT | O_BINARY, 0600); + if (fd < 0) + return 0; + + len = 0; + while(len < RAND_FILE_SIZE) { + res = RAND_bytes(buf, sizeof(buf)); + if (res != 1) + break; + if (write(fd, buf, sizeof(buf)) != sizeof(buf)) { + res = 0; + break; + } + len += sizeof(buf); + } + + close(fd); + + return res; +} + +const char * +RAND_file_name(char *filename, size_t size) +{ + const char *e = NULL; + int pathp = 0, ret; + + if (!issuid()) { + e = getenv("RANDFILE"); + if (e == NULL) { + e = getenv("HOME"); + if (e) + pathp = 1; + } + } + if (e == NULL) { + struct passwd *pw = getpwuid(getuid()); + if (pw) { + e = pw->pw_dir; + pathp = 1; + } + } + if (e == NULL) + return NULL; + + if (pathp) + ret = snprintf(filename, size, "%s/.rnd", e); + else + ret = snprintf(filename, size, "%s", e); + + if (ret <= 0 || ret >= size) + return NULL; + + return filename; +} |