| package certimport (	"errors")var (	ErrRootExpired       = errors.New("root certificate is expired")	ErrExpired           = errors.New("certificate is expired")	ErrNotCA             = errors.New("certificate is not a CA")	ErrNotSelfSigned     = errors.New("certificate is not self-signed")	ErrBlockListed       = errors.New("certificate is in the block list")	ErrSignatureMismatch = errors.New("certificate signature did not match"))
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