*
*/
-#define ENTROPY_NEEDED 20 /* require 160 bits = 20 bytes of randomness */
-
#ifdef MD_RAND_DEBUG
# ifndef NDEBUG
# define NDEBUG
#include <assert.h>
#include <stdio.h>
-#include <time.h>
#include <string.h>
-#include "openssl/e_os.h"
+#include "e_os.h"
+
+#include <openssl/rand.h>
+#include "rand_lcl.h"
#include <openssl/crypto.h>
#include <openssl/err.h>
-#if !defined(USE_MD5_RAND) && !defined(USE_SHA1_RAND) && !defined(USE_MDC2_RAND) && !defined(USE_MD2_RAND)
-#if !defined(NO_SHA) && !defined(NO_SHA1)
-#define USE_SHA1_RAND
-#elif !defined(NO_MD5)
-#define USE_MD5_RAND
-#elif !defined(NO_MDC2) && !defined(NO_DES)
-#define USE_MDC2_RAND
-#elif !defined(NO_MD2)
-#define USE_MD2_RAND
-#else
-#error No message digest algorithm available
-#endif
-#endif
-
-/* Changed how the state buffer used. I now attempt to 'wrap' such
- * that I don't run over the same locations the next time go through
- * the 1023 bytes - many thanks to
- * Robert J. LeBlanc <rjl@renaissoft.com> for his comments
- */
-
-#if defined(USE_MD5_RAND)
-#include <openssl/md5.h>
-#define MD_DIGEST_LENGTH MD5_DIGEST_LENGTH
-#define MD_CTX MD5_CTX
-#define MD_Init(a) MD5_Init(a)
-#define MD_Update(a,b,c) MD5_Update(a,b,c)
-#define MD_Final(a,b) MD5_Final(a,b)
-#define MD(a,b,c) MD5(a,b,c)
-#elif defined(USE_SHA1_RAND)
-#include <openssl/sha.h>
-#define MD_DIGEST_LENGTH SHA_DIGEST_LENGTH
-#define MD_CTX SHA_CTX
-#define MD_Init(a) SHA1_Init(a)
-#define MD_Update(a,b,c) SHA1_Update(a,b,c)
-#define MD_Final(a,b) SHA1_Final(a,b)
-#define MD(a,b,c) SHA1(a,b,c)
-#elif defined(USE_MDC2_RAND)
-#include <openssl/mdc2.h>
-#define MD_DIGEST_LENGTH MDC2_DIGEST_LENGTH
-#define MD_CTX MDC2_CTX
-#define MD_Init(a) MDC2_Init(a)
-#define MD_Update(a,b,c) MDC2_Update(a,b,c)
-#define MD_Final(a,b) MDC2_Final(a,b)
-#define MD(a,b,c) MDC2(a,b,c)
-#elif defined(USE_MD2_RAND)
-#include <openssl/md2.h>
-#define MD_DIGEST_LENGTH MD2_DIGEST_LENGTH
-#define MD_CTX MD2_CTX
-#define MD_Init(a) MD2_Init(a)
-#define MD_Update(a,b,c) MD2_Update(a,b,c)
-#define MD_Final(a,b) MD2_Final(a,b)
-#define MD(a,b,c) MD2(a,b,c)
-#endif
-
-#include <openssl/rand.h>
-
#ifdef BN_DEBUG
# define PREDICT
#endif
-/* #define NORAND 1 */
/* #define PREDICT 1 */
#define STATE_SIZE 1023
static double entropy=0;
static int initialized=0;
+static unsigned int crypto_lock_rand = 0; /* may be set only when a thread
+ * holds CRYPTO_LOCK_RAND
+ * (to prevent double locking) */
+static unsigned long locking_thread = 0; /* valid iff crypto_lock_rand is set */
+
+
#ifdef PREDICT
int rand_predictable=0;
#endif
md_count[0]=0;
md_count[1]=0;
entropy=0;
+ initialized=0;
}
static void ssleay_rand_add(const void *buf, int num, double add)
long md_c[2];
unsigned char local_md[MD_DIGEST_LENGTH];
MD_CTX m;
-
-#ifdef NORAND
- return;
-#endif
+ int do_not_lock;
/*
* (Based on the rand(3) manpage)
* hash function.
*/
- CRYPTO_w_lock(CRYPTO_LOCK_RAND);
+ /* check if we already have the lock */
+ do_not_lock = crypto_lock_rand && (locking_thread == CRYPTO_thread_id());
+
+ if (!do_not_lock) CRYPTO_w_lock(CRYPTO_LOCK_RAND);
st_idx=state_index;
/* use our own copies of the counters so that even
md_count[1] += (num / MD_DIGEST_LENGTH) + (num % MD_DIGEST_LENGTH > 0);
- CRYPTO_w_unlock(CRYPTO_LOCK_RAND);
+ if (!do_not_lock) CRYPTO_w_unlock(CRYPTO_LOCK_RAND);
for (i=0; i<num; i+=MD_DIGEST_LENGTH)
{
MD_Update(&m,buf,j);
MD_Update(&m,(unsigned char *)&(md_c[0]),sizeof(md_c));
- MD_Final(local_md,&m);
+ MD_Final(&m,local_md);
md_c[1]++;
buf=(const char *)buf + j;
}
memset((char *)&m,0,sizeof(m));
- CRYPTO_w_lock(CRYPTO_LOCK_RAND);
+ if (!do_not_lock) CRYPTO_w_lock(CRYPTO_LOCK_RAND);
/* Don't just copy back local_md into md -- this could mean that
* other thread's seeding remains without effect (except for
* the incremented counter). By XORing it we keep at least as
}
if (entropy < ENTROPY_NEEDED) /* stop counting when we have enough */
entropy += add;
- CRYPTO_w_unlock(CRYPTO_LOCK_RAND);
+ if (!do_not_lock) CRYPTO_w_unlock(CRYPTO_LOCK_RAND);
-#ifndef THREADS
+#if !defined(OPENSSL_THREADS) && !defined(OPENSSL_SYS_WIN32)
assert(md_c[1] == md_count[1]);
#endif
}
ssleay_rand_add(buf, num, num);
}
-static void ssleay_rand_initialize(void) /* not exported in RAND_METHOD */
- {
- unsigned long l;
-#ifndef GETPID_IS_MEANINGLESS
- pid_t curr_pid = getpid();
-#endif
-#ifdef DEVRANDOM
- FILE *fh;
-#endif
-
-#ifdef NORAND
- return;
-#endif
-
- CRYPTO_w_unlock(CRYPTO_LOCK_RAND);
- /* put in some default random data, we need more than just this */
-#ifndef GETPID_IS_MEANINGLESS
- l=curr_pid;
- RAND_add(&l,sizeof(l),0);
- l=getuid();
- RAND_add(&l,sizeof(l),0);
-#endif
- l=time(NULL);
- RAND_add(&l,sizeof(l),0);
-
-#ifdef DEVRANDOM
- /* Use a random entropy pool device. Linux, FreeBSD and OpenBSD
- * have this. Use /dev/urandom if you can as /dev/random may block
- * if it runs out of random entries. */
-
- if ((fh = fopen(DEVRANDOM, "r")) != NULL)
- {
- unsigned char tmpbuf[ENTROPY_NEEDED];
- int n;
-
- setvbuf(fh, NULL, _IONBF, 0);
- n=fread((unsigned char *)tmpbuf,1,ENTROPY_NEEDED,fh);
- fclose(fh);
- RAND_add(tmpbuf,sizeof tmpbuf,n);
- memset(tmpbuf,0,n);
- }
-#endif
-#ifdef PURIFY
- memset(state,0,STATE_SIZE);
- memset(md,0,MD_DIGEST_LENGTH);
-#endif
- CRYPTO_w_lock(CRYPTO_LOCK_RAND);
- initialized=1;
- }
-
static int ssleay_rand_bytes(unsigned char *buf, int num)
{
static volatile int stirred_pool = 0;
CRYPTO_w_lock(CRYPTO_LOCK_RAND);
- if (!initialized)
- ssleay_rand_initialize();
+ /* prevent ssleay_rand_bytes() from trying to obtain the lock again */
+ crypto_lock_rand = 1;
+ locking_thread = CRYPTO_thread_id();
+ if (!initialized)
+ {
+ RAND_poll();
+ initialized = 1;
+ }
+
if (!stirred_pool)
do_stir_pool = 1;
* are now ours (but other threads may use them too) */
md_count[0] += 1;
+
+ /* before unlocking, we must clear 'crypto_lock_rand' */
+ crypto_lock_rand = 0;
+ locking_thread = 0;
CRYPTO_w_unlock(CRYPTO_LOCK_RAND);
while (num > 0)
}
else
MD_Update(&m,&(state[st_idx]),j);
- MD_Final(local_md,&m);
+ MD_Final(&m,local_md);
for (i=0; i<j; i++)
{
MD_Update(&m,local_md,MD_DIGEST_LENGTH);
CRYPTO_w_lock(CRYPTO_LOCK_RAND);
MD_Update(&m,md,MD_DIGEST_LENGTH);
- MD_Final(md,&m);
+ MD_Final(&m,md);
CRYPTO_w_unlock(CRYPTO_LOCK_RAND);
memset(&m,0,sizeof(m));
else
{
RANDerr(RAND_F_SSLEAY_RAND_BYTES,RAND_R_PRNG_NOT_SEEDED);
+ ERR_add_error_data(1, "You need to read the OpenSSL FAQ, "
+ "http://www.openssl.org/support/faq.html");
return(0);
}
}
unpredictable */
static int ssleay_rand_pseudo_bytes(unsigned char *buf, int num)
{
- int ret, err;
+ int ret;
+ unsigned long err;
ret = RAND_bytes(buf, num);
if (ret == 0)
static int ssleay_rand_status(void)
{
int ret;
+ int do_not_lock;
- CRYPTO_w_lock(CRYPTO_LOCK_RAND);
-
+ /* check if we already have the lock
+ * (could happen if a RAND_poll() implementation calls RAND_status()) */
+ do_not_lock = crypto_lock_rand && (locking_thread == CRYPTO_thread_id());
+
+ if (!do_not_lock)
+ {
+ CRYPTO_w_lock(CRYPTO_LOCK_RAND);
+
+ /* prevent ssleay_rand_bytes() from trying to obtain the lock again */
+ crypto_lock_rand = 1;
+ locking_thread = CRYPTO_thread_id();
+ }
+
if (!initialized)
- ssleay_rand_initialize();
- ret = entropy >= ENTROPY_NEEDED;
+ {
+ RAND_poll();
+ initialized = 1;
+ }
- CRYPTO_w_unlock(CRYPTO_LOCK_RAND);
+ ret = entropy >= ENTROPY_NEEDED;
+ if (!do_not_lock)
+ {
+ /* before unlocking, we must clear 'crypto_lock_rand' */
+ crypto_lock_rand = 0;
+ locking_thread = 0;
+
+ CRYPTO_w_unlock(CRYPTO_LOCK_RAND);
+ }
+
return ret;
}
projects / oweals / openssl.git / blobdiff