When I read the wallet file using the code in the original code, I encountered this error: gob: type elliptic.p256Curve has no exported fields.
This is due to the fact that the elliptic.p256Curve type in the crypto/elliptic package has no exported fields, whereas the Gob encoder requires that all fields in the struct must be exported.
So I defined an exportable type, SerializableWallet, to store the parameters of the elliptic curve, and modified the decoding and encoding parts of the LoadFromFile and SaveToFile methods.
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Ivan Kuznetsov