Revert "Use the rust crypto lib instead of ecies lib."

The rust crypto lib cannot be used in the same go binary as the lightspark-crypto-uniffi lib due to duplicate symbols at linking time. This results in the demo vasp breaking when trying to use both lightspark-sdk and this uma sdk.

This reverts commit cb9d57b.

go.mod

@@ -4,14 +4,14 @@ go 1.21
 
 require (
 	github.com/decred/dcrd/dcrec/secp256k1/v4 v4.2.0
+	github.com/ecies/go/v2 v2.0.7
 	github.com/stretchr/testify v1.8.4
-	github.com/uma-universal-money-address/uma-crypto-uniffi/uma-crypto-go v0.0.0-20231101191600-2e4bd3b7e318
 )
 
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/kr/pretty v0.3.1 // indirect
+	github.com/ethereum/go-ethereum v1.12.0 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c // indirect
+	golang.org/x/crypto v0.11.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )