[libconsensus] Script verification API with amounts

script_tests: always test bitcoinconsensus_verify_script_with_amount if VERIFY_WITNESS isn't set

Rename internal method + make it static

trim bitcoinconsensus_ prefix

Add SERIALIZE_TRANSACTION_WITNESS flag

src/script/bitcoinconsensus.h

@@ -33,7 +33,7 @@
 extern "C" {
 #endif
 
-#define BITCOINCONSENSUS_API_VER 0
+#define BITCOINCONSENSUS_API_VER 1
 
 typedef enum bitcoinconsensus_error_t
 {
@@ -41,6 +41,7 @@ typedef enum bitcoinconsensus_error_t
     bitcoinconsensus_ERR_TX_INDEX,
     bitcoinconsensus_ERR_TX_SIZE_MISMATCH,
     bitcoinconsensus_ERR_TX_DESERIALIZE,
+    bitcoinconsensus_ERR_AMOUNT_REQUIRED,
 } bitcoinconsensus_error;
 
 /** Script verification flags */
@@ -50,6 +51,7 @@ enum
     bitcoinconsensus_SCRIPT_FLAGS_VERIFY_P2SH                = (1U << 0), // evaluate P2SH (BIP16) subscripts
     bitcoinconsensus_SCRIPT_FLAGS_VERIFY_DERSIG              = (1U << 2), // enforce strict DER (BIP66) compliance
     bitcoinconsensus_SCRIPT_FLAGS_VERIFY_CHECKLOCKTIMEVERIFY = (1U << 9), // enable CHECKLOCKTIMEVERIFY (BIP65)
+    bitcoinconsensus_SCRIPT_FLAGS_VERIFY_WITNESS             = (1U << 11), // enable WITNESS (BIP141)
 };
 
 /// Returns 1 if the input nIn of the serialized transaction pointed to by
@@ -57,6 +59,10 @@ enum
 /// the additional constraints specified by flags.
 /// If not NULL, err will contain an error/success code for the operation
 EXPORT_SYMBOL int bitcoinconsensus_verify_script(const unsigned char *scriptPubKey, unsigned int scriptPubKeyLen,
+                                                 const unsigned char *txTo        , unsigned int txToLen,
+                                                 unsigned int nIn, unsigned int flags, bitcoinconsensus_error* err);
+
+EXPORT_SYMBOL int bitcoinconsensus_verify_script_with_amount(const unsigned char *scriptPubKey, unsigned int scriptPubKeyLen, int64_t amount,
                                     const unsigned char *txTo        , unsigned int txToLen,
                                     unsigned int nIn, unsigned int flags, bitcoinconsensus_error* err);