liboqs: add RNG support for falcon

Added a RNG argument to the wc_falcon_sign_msg method to properly
generate necessary random data using the desired WolfSSL RNG object.

Signed-off-by: Tobias Frauenschläger <t.frauenschlaeger@me.com>

Author: Frauschi

src/tls13.c

@@ -8887,7 +8887,7 @@ static int SendTls13CertificateVerify(WOLFSSL* ssl)
                 ret = wc_falcon_sign_msg(args->sigData, args->sigDataSz,
                                          args->verify + HASH_SIG_SIZE +
                                          VERIFY_HEADER, (word32*)&sig->length,
-                                         (falcon_key*)ssl->hsKey);
+                                         (falcon_key*)ssl->hsKey, ssl->rng);
                 args->length = (word16)sig->length;
             }
             #endif

wolfcrypt/benchmark/benchmark.c

@@ -11788,7 +11788,7 @@ void bench_falconKeySign(byte level)
                     x = FALCON_LEVEL5_SIG_SIZE;
                 }
 
-                ret = wc_falcon_sign_msg(msg, sizeof(msg), sig, &x, &key);
+                ret = wc_falcon_sign_msg(msg, sizeof(msg), sig, &x, &key, GLOBAL_RNG);
                 if (ret != 0) {
                     printf("wc_falcon_sign_msg failed\n");
                 }

wolfcrypt/src/asn.c

@@ -28897,7 +28897,7 @@ static int MakeSignature(CertSignCtx* certSignCtx, const byte* buf, word32 sz,
     #if defined(HAVE_FALCON)
         if (!rsaKey && !eccKey && !ed25519Key && !ed448Key && falconKey) {
             word32 outSz = sigSz;
-            ret = wc_falcon_sign_msg(buf, sz, sig, &outSz, falconKey);
+            ret = wc_falcon_sign_msg(buf, sz, sig, &outSz, falconKey, rng);
             if (ret == 0)
                 ret = outSz;
         }

wolfcrypt/src/falcon.c

@@ -59,7 +59,7 @@
  */
 int wc_falcon_sign_msg(const byte* in, word32 inLen,
                               byte* out, word32 *outLen,
-                              falcon_key* key)
+                              falcon_key* key, WC_RNG* rng)
 {
     int ret = 0;
 #ifdef HAVE_LIBOQS
@@ -101,6 +101,10 @@ int wc_falcon_sign_msg(const byte* in, word32 inLen,
         localOutLen = *outLen;
     }
 
+    if (ret == 0) {
+        ret = wolfSSL_liboqsRngMutexLock(rng);
+    }
+
     if ((ret == 0) &&
         (OQS_SIG_sign(oqssig, out, &localOutLen, in, inLen, key->k)
          == OQS_ERROR)) {
@@ -111,6 +115,8 @@ int wc_falcon_sign_msg(const byte* in, word32 inLen,
         *outLen = (word32)localOutLen;
     }
 
+    wolfSSL_liboqsRngMutexUnlock();
+
     if (oqssig != NULL) {
         OQS_SIG_free(oqssig);
     }

wolfssl/wolfcrypt/falcon.h

@@ -35,6 +35,7 @@
 
 #ifdef HAVE_LIBOQS
 #include <oqs/oqs.h>
+#include <wolfssl/wolfcrypt/port/liboqs/liboqs.h>
 #endif
 
 #ifdef __cplusplus
@@ -79,7 +80,7 @@ struct falcon_key {
 
 WOLFSSL_API
 int wc_falcon_sign_msg(const byte* in, word32 inLen, byte* out, word32 *outLen,
-                       falcon_key* key);
+                       falcon_key* key, WC_RNG* rng);
 WOLFSSL_API
 int wc_falcon_verify_msg(const byte* sig, word32 sigLen, const byte* msg,
                          word32 msgLen, int* res, falcon_key* key);