New function RAND_pseudo_bytes() generated pseudorandom numbers that

[openssl.git] / crypto / rand / md_rand.c

diff --git a/crypto/rand/md_rand.c b/crypto/rand/md_rand.c
index dbed1dcde26c10f0c6275b08b64cafe774d4505c..7b8cde94012241467524596eadde681ca444aff4 100644 (file)
--- a/crypto/rand/md_rand.c
+++ b/crypto/rand/md_rand.c
@@ -146,12 +146,14 @@ static void ssleay_rand_cleanup(void);
 static void ssleay_rand_seed(const void *buf, int num);
 static void ssleay_rand_add(const void *buf, int num, int add_entropy);
 static int ssleay_rand_bytes(unsigned char *buf, int num);
+static int ssleay_rand_pseudo_bytes(unsigned char *buf, int num);
 
 RAND_METHOD rand_ssleay_meth={
        ssleay_rand_seed,
        ssleay_rand_bytes,
        ssleay_rand_cleanup,
        ssleay_rand_add,
+       ssleay_rand_pseudo_bytes,
        }; 
 
 RAND_METHOD *RAND_SSLeay(void)
@@ -449,6 +451,23 @@ static int ssleay_rand_bytes(unsigned char *buf, int num)
                }
        }
 
+/* pseudo-random bytes that are guaranteed to be unique but not
+   unpredictable */
+static int ssleay_rand_pseudo_bytes(unsigned char *buf, int num) 
+       {
+       int ret, err;
+
+       ret = RAND_bytes(buf, num);
+       if (ret == 0)
+               {
+               err = ERR_peek_error();
+               if (ERR_GET_LIB(err) == ERR_LIB_RAND &&
+                   ERR_GET_REASON(err) == RAND_R_PRNG_NOT_SEEDED)
+                       (void)ERR_get_error();
+               }
+       return (ret);
+       }
+
 #ifdef WINDOWS
 #include <windows.h>
 #include <openssl/rand.h>