Package: github.com/jcmturner/gofork/encoding/asn1

package asn1 Import Path github.com/jcmturner/gofork/encoding/asn1 (on go.dev) Dependency Relation imports 10 packages, and imported by 8 packages

Involved Source Files d asn1.go Package asn1 implements parsing of DER-encoded ASN.1 data structures, as defined in ITU-T Rec X.690. See also ``A Layman's Guide to a Subset of ASN.1, BER, and DER,'' http://luca.ntop.org/Teaching/Appunti/asn1.html. common.go marshal.go

Package-Level Functions (total 3)

func Marshal(val interface{}) ([]byte, error) Marshal returns the ASN.1 encoding of val. In addition to the struct tags recognised by Unmarshal, the following can be used: ia5: causes strings to be marshaled as ASN.1, IA5 strings omitempty: causes empty slices to be skipped printable: causes strings to be marshaled as ASN.1, PrintableString strings. utf8: causes strings to be marshaled as ASN.1, UTF8 strings

func Unmarshal(b []byte, val interface{}) (rest []byte, err error) Unmarshal parses the DER-encoded ASN.1 data structure b and uses the reflect package to fill in an arbitrary value pointed at by val. Because Unmarshal uses the reflect package, the structs being written to must use upper case field names. An ASN.1 INTEGER can be written to an int, int32, int64, or *big.Int (from the math/big package). If the encoded value does not fit in the Go type, Unmarshal returns a parse error. An ASN.1 BIT STRING can be written to a BitString. An ASN.1 OCTET STRING can be written to a []byte. An ASN.1 OBJECT IDENTIFIER can be written to an ObjectIdentifier. An ASN.1 ENUMERATED can be written to an Enumerated. An ASN.1 UTCTIME or GENERALIZEDTIME can be written to a time.Time. An ASN.1 PrintableString or IA5String can be written to a string. Any of the above ASN.1 values can be written to an interface{}. The value stored in the interface has the corresponding Go type. For integers, that type is int64. An ASN.1 SEQUENCE OF x or SET OF x can be written to a slice if an x can be written to the slice's element type. An ASN.1 SEQUENCE or SET can be written to a struct if each of the elements in the sequence can be written to the corresponding element in the struct. The following tags on struct fields have special meaning to Unmarshal: application specifies that a APPLICATION tag is used default:x sets the default value for optional integer fields explicit specifies that an additional, explicit tag wraps the implicit one optional marks the field as ASN.1 OPTIONAL set causes a SET, rather than a SEQUENCE type to be expected tag:x specifies the ASN.1 tag number; implies ASN.1 CONTEXT SPECIFIC If the type of the first field of a structure is RawContent then the raw ASN1 contents of the struct will be stored in it. If the type name of a slice element ends with "SET" then it's treated as if the "set" tag was set on it. This can be used with nested slices where a struct tag cannot be given. Other ASN.1 types are not supported; if it encounters them, Unmarshal returns a parse error.

func UnmarshalWithParams(b []byte, val interface{}, params string) (rest []byte, err error) UnmarshalWithParams allows field parameters to be specified for the top-level element. The form of the params is the same as the field tags.