New Atmel support (WOLFSSL_ATMEL) and port for ATECC508A (WOLFSSL_ATECC508A). Adds wolfCrypt support for ECC Hardware acceleration using the ATECC508A. Adds new PK callback for ECC shared secret. Fixed missing "wc_InitRng_ex" when using "CUSTOM_RAND_GENERATE_BLOCK". Added ATECC508A RNG block function for P-RNG bypass ability. Added internal "wolfSSL_GetEccPrivateKey" function for getting reference to private key for ECC shared secret (used in test.h for testing PK_CALLBACK mode). Added README.md for using the Atmel ATECC508A port.

src/ssl.c

@@ -958,6 +958,51 @@ int wolfSSL_SetMinEccKey_Sz(WOLFSSL* ssl, short keySz)
     ssl->options.minEccKeySz = keySz / 8;
     return SSL_SUCCESS;
 }
+
+/* Gets ECC key for shared secret callback testing
+ * Client side: returns peer key
+ * Server side: returns private key
+ */
+int wolfSSL_GetEccKey(WOLFSSL* ssl, struct ecc_key** key)
+{
+    if (ssl == NULL || key == NULL) {
+        return BAD_FUNC_ARG;
+    }
+
+    if (ssl->options.side == WOLFSSL_CLIENT_END) {
+        if (ssl->specs.static_ecdh) {
+            if (!ssl->peerEccDsaKey || !ssl->peerEccDsaKeyPresent ||
+                                       !ssl->peerEccDsaKey->dp) {
+                return NO_PEER_KEY;
+            }
+            *key = (struct ecc_key*)ssl->peerEccDsaKey;
+        }
+        else {
+            if (!ssl->peerEccKey || !ssl->peerEccKeyPresent ||
+                                    !ssl->peerEccKey->dp) {
+                return NO_PEER_KEY;
+            }
+            *key = (struct ecc_key*)ssl->peerEccKey;
+        }
+    }
+    else if (ssl->options.side == WOLFSSL_SERVER_END) {
+        if (ssl->specs.static_ecdh) {
+            if (ssl->sigKey == NULL) {
+                return NO_PRIVATE_KEY;
+            }
+            *key = (struct ecc_key*)ssl->sigKey;
+        }
+        else {
+            if (!ssl->eccTempKeyPresent) {
+                return NO_PRIVATE_KEY;
+            }
+            *key = (struct ecc_key*)ssl->eccTempKey;
+        }
+    }
+
+    return 0;
+}
+
 #endif /* !NO_RSA */
 
 #ifndef NO_RSA
@@ -18202,6 +18247,26 @@ void* wolfSSL_GetEccVerifyCtx(WOLFSSL* ssl)
     return NULL;
 }
 
+void wolfSSL_CTX_SetEccSharedSecretCb(WOLFSSL_CTX* ctx, CallbackEccSharedSecret cb)
+{
+    if (ctx)
+        ctx->EccSharedSecretCb = cb;
+}
+
+void  wolfSSL_SetEccSharedSecretCtx(WOLFSSL* ssl, void *ctx)
+{
+    if (ssl)
+        ssl->EccSharedSecretCtx = ctx;
+}
+
+
+void* wolfSSL_GetEccSharedSecretCtx(WOLFSSL* ssl)
+{
+    if (ssl)
+        return ssl->EccSharedSecretCtx;
+
+    return NULL;
+}
 #endif /* HAVE_ECC */
 
 #ifndef NO_RSA