Disambiguate rpcSRC_ACT_NOT_FOUND errors so it's clear when it's the

secret that's at fault.

src/cpp/ripple/RPCErr.cpp

@@ -60,6 +60,7 @@ Json::Value rpcError(int iError, Json::Value jvResult)
 		{ rpcSRC_ACT_MALFORMED,		"srcActMalformed",	"Source account is malformed."							},
 		{ rpcSRC_ACT_MISSING,		"srcActMissing",	"Source account not provided."							},
 		{ rpcSRC_ACT_NOT_FOUND,		"srcActNotFound",	"Source account not found."								},
+		{ rpcBAD_SECRET,			"badSecret",		"Secret does not match account."						},
 		{ rpcSRC_AMT_MALFORMED,		"srcAmtMalformed",	"Source amount/currency/issuer is malformed."			},
 		{ rpcSRC_CUR_MALFORMED,		"srcCurMalformed",	"Source currency is malformed."							},
 		{ rpcSRC_ISR_MALFORMED,		"srcIsrMalformed",	"Source issuer is malformed."							},

src/cpp/ripple/RPCErr.h

@@ -67,6 +67,7 @@ enum {
 	rpcSRC_AMT_MALFORMED,
 	rpcSRC_CUR_MALFORMED,
 	rpcSRC_ISR_MALFORMED,
+	rpcBAD_SECRET,
 
 	// Internal error (should never happen)
 	rpcINTERNAL,		// Generic internal error.

src/cpp/ripple/RPCHandler.cpp

@@ -251,7 +251,7 @@ Json::Value RPCHandler::transactionSign(Json::Value jvRequest, bool bSubmit)
 
 	if (!bFound)
 	{
-		return rpcError(rpcSRC_ACT_NOT_FOUND);
+		return rpcError(rpcBAD_SECRET);
 	}
 
 	// Use the generator to determine the associated public and private keys.