Imports github.com/tjfoc/gmsm/sm2 github.com/33cn/plugin/plugin/crypto/ecdsa github.com/33cn/chain33/system/crypto/sm2 github.com/33cn/chain33/common/crypto github.com/33cn/plugin/plugin/dapp/cert/types github.com/pkg/errors Standard library imports crypto/ecdsa encoding/asn1 crypto/elliptic crypto/sha256 crypto/x509 encoding/hex encoding/pem fmt io io/ioutil math/big os