README
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go-asn1utils
Description
go-asn1utils is a Go library designed to facilitate the manipulation of ASN.1 encoded data. Its primary functionality is to convert ASN.1 bytes—which may use BER (Basic Encoding Rules) features like indefinite lengths—into DER (Distinguished Encoding Rules) compliant bytes.
Key features include:
- Parsing ASN.1 structures with support for both definite and indefinite length encodings.
- Handling constructed and primitive types.
- Canonicalizing output to strict DER format, including:
- Normalizing boolean values.
- Flattening constructed forms of primitive types (e.g., OCTET STRING, BIT STRING).
- Sorting elements in SET types.
This utility ensures that ASN.1 data is represented in a canonical form, suitable for cryptographic operations such as signing and verification where a unique encoding is required.
Documentation
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Index ¶
Constants ¶
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Variables ¶
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Functions ¶
Types ¶
type ASN1Object ¶
type ASN1Object struct {
Class int // 0=Universal, 1=Application, 2=Context-specific, 3=Private
TagNumber int // The tag number (could be > 30 for extended tags)
IsConstructed bool
Value []byte // Used if primitive (holds the content bytes)
SubObjects []ASN1Object // Used if constructed (holds the parsed sub-elements)
}
ASN1Object represents an ASN.1 element (potentially constructed with sub-elements)
Source Files
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