package asn1

Import Path
	encoding/asn1 (on golang.org and go.dev)

Dependency Relation
	imports 12 packages, and imported by 3 packages

Involved Source Files
	d-> asn1.go
	    common.go
	    marshal.go

Exported Type Names

type BitString (struct) BitString is the structure to use when you want an ASN.1 BIT STRING type. A bit string is padded up to the nearest byte in memory and the number of valid bits is recorded. Padding bits will be zero. BitLength int Bytes []byte (T) At(i int) int (T) RightAlign() []byte func vendor/golang.org/x/crypto/cryptobyte.(*String).ReadASN1BitString(out *BitString) bool
type Enumerated int An Enumerated is represented as a plain int.
type Flag bool A Flag accepts any data and is set to true if present.
type ObjectIdentifier ([]) An ObjectIdentifier represents an ASN.1 OBJECT IDENTIFIER. (T) Equal(other ObjectIdentifier) bool (T) String() string T : expvar.Var T : fmt.Stringer func ObjectIdentifier.Equal(other ObjectIdentifier) bool func vendor/golang.org/x/crypto/cryptobyte.(*Builder).AddASN1ObjectIdentifier(oid ObjectIdentifier) func vendor/golang.org/x/crypto/cryptobyte.(*String).ReadASN1ObjectIdentifier(out *ObjectIdentifier) bool
type RawContent ([]) RawContent is used to signal that the undecoded, DER data needs to be preserved for a struct. To use it, the first field of the struct must have this type. It's an error for any of the other fields to have this type.
type RawValue (struct) A RawValue represents an undecoded ASN.1 object. Bytes []byte Class int FullBytes []byte IsCompound bool Tag int var NullRawValue
type StructuralError (struct) A StructuralError suggests that the ASN.1 data is valid, but the Go type which is receiving it doesn't match. Msg string (T) Error() string T : error
type SyntaxError (struct) A SyntaxError suggests that the ASN.1 data is invalid. Msg string (T) Error() string T : error
Exported Values
const ClassApplication = 1 ASN.1 class types represent the namespace of the tag.
const ClassContextSpecific = 2 ASN.1 class types represent the namespace of the tag.
const ClassPrivate = 3 ASN.1 class types represent the namespace of the tag.
const ClassUniversal = 0 ASN.1 class types represent the namespace of the tag.
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, IA5String values omitempty: causes empty slices to be skipped printable: causes strings to be marshaled as ASN.1, PrintableString values utf8: causes strings to be marshaled as ASN.1, UTF8String values utc: causes time.Time to be marshaled as ASN.1, UTCTime values generalized: causes time.Time to be marshaled as ASN.1, GeneralizedTime values
func MarshalWithParams(val interface{}, params string) ([]byte, error) MarshalWithParams allows field parameters to be specified for the top-level element. The form of the params is the same as the field tags.
var NullBytes []byte NullBytes contains bytes representing the DER-encoded ASN.1 NULL type.
var NullRawValue RawValue NullRawValue is a RawValue with its Tag set to the ASN.1 NULL type tag (5).
const TagBitString = 3 ASN.1 tags represent the type of the following object.
const TagBMPString = 30 ASN.1 tags represent the type of the following object.
const TagBoolean = 1 ASN.1 tags represent the type of the following object.
const TagEnum = 10 ASN.1 tags represent the type of the following object.
const TagGeneralizedTime = 24 ASN.1 tags represent the type of the following object.
const TagGeneralString = 27 ASN.1 tags represent the type of the following object.
const TagIA5String = 22 ASN.1 tags represent the type of the following object.
const TagInteger = 2 ASN.1 tags represent the type of the following object.
const TagNull = 5 ASN.1 tags represent the type of the following object.
const TagNumericString = 18 ASN.1 tags represent the type of the following object.
const TagOctetString = 4 ASN.1 tags represent the type of the following object.
const TagOID = 6 ASN.1 tags represent the type of the following object.
const TagPrintableString = 19 ASN.1 tags represent the type of the following object.
const TagSequence = 16 ASN.1 tags represent the type of the following object.
const TagSet = 17 ASN.1 tags represent the type of the following object.
const TagT61String = 20 ASN.1 tags represent the type of the following object.
const TagUTCTime = 23 ASN.1 tags represent the type of the following object.
const TagUTF8String = 12 ASN.1 tags represent the type of the following object.
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. After parsing b, any bytes that were leftover and not used to fill val will be returned in rest. When parsing a SEQUENCE into a struct, any trailing elements of the SEQUENCE that do not have matching fields in val will not be included in rest, as these are considered valid elements of the SEQUENCE and not trailing data. 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, IA5String, or NumericString 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 an APPLICATION tag is used private specifies that a PRIVATE tag is used default:x sets the default value for optional integer fields (only used if optional is also present) 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.