[openssl-dev] PRNG function

[Vadiim Lebedev]

Hello, 
I'am attaching patch for crypto/rand/rnd_lcl.h which configures openssl to 
use SHA256 as hash function for PRNG....
This is a requirement form french "Agence nationale de securité de services 
d'informtion"  (ANSSI. I hope it will be accepted.
=============================================================
--- /home/vadim/Downloads/openssl-1.0.1h/crypto/rand/rand_lcl.h	2014-06-05 
11:41:30.000000000 +0200
+++ /tmp/new/rand_lcl.h	2015-07-20 16:07:58.513282954 +0200
@@ -115,7 +115,9 @@
 #define ENTROPY_NEEDED 32  /* require 256 bits = 32 bytes of randomness */
 
 
-#if !defined(USE_MD5_RAND) && !defined(USE_SHA1_RAND) && 
!defined(USE_MDC2_RAND) && !defined(USE_MD2_RAND)
+#if !defined(USE_MD5_RAND) && !defined(USE_SHA1_RAND) && 
!defined(USE_MDC2_RAND) && !defined(USE_MD2_RAND) && 
!defined(USE_SHA256_RAND)
+#if !defined(OPENSSL_NO_SHA) && !defined(OPENSSL_NO_SHA256)
+#define USE_SHA256_RAND
 #if !defined(OPENSSL_NO_SHA) && !defined(OPENSSL_NO_SHA1)
 #define USE_SHA1_RAND
 #elif !defined(OPENSSL_NO_MD5)
@@ -142,6 +144,11 @@
 #define MD_DIGEST_LENGTH	SHA_DIGEST_LENGTH
 #define MD_Init(a)		EVP_DigestInit_ex(a,EVP_sha1(), NULL)
 #define	MD(a,b,c)		EVP_Digest(a,b,c,NULL,EVP_sha1(), 
NULL)
+#elif defined(USE_SHA256_RAND)
+#include <openssl/sha.h>
+#define MD_DIGEST_LENGTH        SHA256_DIGEST_LENGTH
+#define MD_Init(a)              EVP_DigestInit_ex(a,EVP_sha256(), NULL)
+#define MD(a,b,c)               EVP_Digest(a,b,c,NULL,EVP_sha256(), NULL)
 #elif defined(USE_MDC2_RAND)
 #include <openssl/mdc2.h>
 #define MD_DIGEST_LENGTH	MDC2_DIGEST_LENGTH