Avoid VLA in hash.h

Github-Pull: #9791
Rebased-From: 5c8fd50811

src/hash.h

@@ -25,9 +25,9 @@ public:
     static const size_t OUTPUT_SIZE = CSHA256::OUTPUT_SIZE;
 
     void Finalize(unsigned char hash[OUTPUT_SIZE]) {
-        unsigned char buf[sha.OUTPUT_SIZE];
+        unsigned char buf[CSHA256::OUTPUT_SIZE];
         sha.Finalize(buf);
-        sha.Reset().Write(buf, sha.OUTPUT_SIZE).Finalize(hash);
+        sha.Reset().Write(buf, CSHA256::OUTPUT_SIZE).Finalize(hash);
     }
 
     CHash256& Write(const unsigned char *data, size_t len) {
@@ -49,9 +49,9 @@ public:
     static const size_t OUTPUT_SIZE = CRIPEMD160::OUTPUT_SIZE;
 
     void Finalize(unsigned char hash[OUTPUT_SIZE]) {
-        unsigned char buf[sha.OUTPUT_SIZE];
+        unsigned char buf[CSHA256::OUTPUT_SIZE];
         sha.Finalize(buf);
-        CRIPEMD160().Write(buf, sha.OUTPUT_SIZE).Finalize(hash);
+        CRIPEMD160().Write(buf, CSHA256::OUTPUT_SIZE).Finalize(hash);
     }
 
     CHash160& Write(const unsigned char *data, size_t len) {