Fix Espressif SHA512 SW fallback endianness

Author: gojimmypi

IDE/Espressif/ESP-IDF/examples/wolfssl_test/components/wolfssl/include/user_settings.h

@@ -131,8 +131,8 @@
     #elif defined(CONFIG_IDF_TARGET_ESP32)   || \
           defined(CONFIG_IDF_TARGET_ESP32S2) || \
           defined(CONFIG_IDF_TARGET_ESP32S3)
-        /* TODO: SRP Not enabled, known to fail on this target
-         * See https://github.com/wolfSSL/wolfssl/issues/7210 */
+        #define WOLFCRYPT_HAVE_SRP
+        #define FP_MAX_BITS (8192 * 2)
     #elif defined(CONFIG_IDF_TARGET_ESP32C3) || \
           defined(CONFIG_IDF_TARGET_ESP32H2)
         /* SRP Known to be working on this target::*/
@@ -750,3 +750,26 @@ Turn on timer debugging (used when CPU cycles not available)
         #error "Must define USE_CERT_BUFFERS_2048 or USE_CERT_BUFFERS_1024"
     #endif
 #endif /* Conditional key and cert constant names */
+
+/******************************************************************************
+** Sanity Checks
+******************************************************************************/
+#if defined(CONFIG_ESP_MAIN_TASK_STACK_SIZE)
+    #if defined(WOLFCRYPT_HAVE_SRP)
+        #if defined(FP_MAX_BITS)
+            #if FP_MAX_BITS <  (8192 * 2)
+                #define ESP_SRP_MINIMUM_STACK_8K (24 * 1024)
+            #else
+                #define ESP_SRP_MINIMUM_STACK_8K (28 * 1024)
+            #endif
+        #else
+            #error "Please define FP_MAX_BITS when using WOLFCRYPT_HAVE_SRP."
+        #endif
+
+        #if (CONFIG_ESP_MAIN_TASK_STACK_SIZE < ESP_SRP_MINIMUM_STACK)
+            #warning "WOLFCRYPT_HAVE_SRP enabled with small stack size"
+        #endif
+    #endif
+#else
+    #warning "CONFIG_ESP_MAIN_TASK_STACK_SIZE not defined!"
+#endif

wolfcrypt/src/sha512.c

@@ -990,17 +990,19 @@ static WC_INLINE int Sha512Update(wc_Sha512* sha512, const byte* data, word32 le
          defined(NO_WOLFSSL_ESP32_CRYPT_HASH_SHA512)
             ret = Transform_Sha512(sha512);
     #else
-            if(sha512->ctx.mode == ESP32_SHA_INIT) {
+            if (sha512->ctx.mode == ESP32_SHA_INIT) {
                 esp_sha_try_hw_lock(&sha512->ctx);
             }
-            ret = esp_sha512_process(sha512);
-            if(ret == 0 && sha512->ctx.mode == ESP32_SHA_SW){
+            if (sha512->ctx.mode == ESP32_SHA_SW) {
                 ByteReverseWords64(sha512->buffer, sha512->buffer,
                                                          WC_SHA512_BLOCK_SIZE);
                 ret = Transform_Sha512(sha512);
             }
+            else {
+                ret = esp_sha512_process(sha512);
+            }
     #endif
-            if (ret == 0)
+            if (ret == ESP_OK)
                 sha512->buffLen = 0;
             else
                 len = 0;
@@ -1884,7 +1886,8 @@ int wc_Sha512Copy(wc_Sha512* src, wc_Sha512* dst)
     ret = wolfAsync_DevCopy(&src->asyncDev, &dst->asyncDev);
 #endif
 
-#if defined(WOLFSSL_USE_ESP32_CRYPT_HASH_HW)
+#if defined(WOLFSSL_USE_ESP32_CRYPT_HASH_HW) && \
+   !defined(NO_WOLFSSL_ESP32_CRYPT_HASH_SHA512)
     #if defined(CONFIG_IDF_TARGET_ESP32)
     if (ret == 0) {
         ret = esp_sha512_ctx_copy(src, dst);
@@ -2169,7 +2172,8 @@ int wc_Sha384Copy(wc_Sha384* src, wc_Sha384* dst)
     ret = wolfAsync_DevCopy(&src->asyncDev, &dst->asyncDev);
 #endif
 
-#if defined(WOLFSSL_USE_ESP32_CRYPT_HASH_HW)
+#if defined(WOLFSSL_USE_ESP32_CRYPT_HASH_HW) && \
+   !defined(NO_WOLFSSL_ESP32_CRYPT_HASH_SHA384)
     #if defined(CONFIG_IDF_TARGET_ESP32)
         esp_sha384_ctx_copy(src, dst);
     #elif defined(CONFIG_IDF_TARGET_ESP32C2) || \