Fix undefined behavior: strict aliasing rule violations

They leaded to overriding caller's local variables.

Author: sergio-nsk

mz_crypt_apple.c

@@ -244,6 +244,7 @@ int32_t mz_crypt_aes_encrypt(void *handle, const void *aad, int32_t aad_size, ui
 
 int32_t mz_crypt_aes_encrypt_final(void *handle, uint8_t *buf, int32_t size, uint8_t *tag, int32_t tag_size) {
     mz_crypt_aes *aes = (mz_crypt_aes *)handle;
+    size_t tag_outsize = tag_size;
 
     if (!aes || !tag || !tag_size || !aes->crypt || aes->mode != MZ_AES_MODE_GCM)
         return MZ_PARAM_ERROR;
@@ -252,7 +253,7 @@ int32_t mz_crypt_aes_encrypt_final(void *handle, uint8_t *buf, int32_t size, uin
     if (aes->error != kCCSuccess)
         return MZ_CRYPT_ERROR;
 
-    aes->error = CCCryptorGCMFinal(aes->crypt, tag, (size_t *)&tag_size);
+    aes->error = CCCryptorGCMFinal(aes->crypt, tag, &tag_outsize);
 
     if (aes->error != kCCSuccess)
         return MZ_CRYPT_ERROR;

mz_crypt_openssl.c

@@ -634,7 +634,10 @@ int32_t mz_crypt_hmac_end(void *handle, uint8_t *digest, int32_t digest_size) {
         result = HMAC_Final(hmac->ctx, digest, (uint32_t *)&digest_size);
     }
 #else
-    result = EVP_MAC_final(hmac->ctx, digest, (size_t *)&digest_size, digest_size);
+    {
+        size_t digest_outsize = digest_size;
+        result = EVP_MAC_final(hmac->ctx, digest, &digest_outsize, digest_size);
+    }
 #endif
 
     if (!result) {