This module contains support to encode and decode ASN.1 values.

• Encoding is done using the DER (distinguished encoding rules) to ensure a unique encoded represenation.

• Decoding is done using the BER to accept a wider range of input. If the data to encode is not in canonical form (that is, if it violates the DER, that is signalled via the GenericAsn1Value.violatesDer flag on the decoded object.

A specific custom ASN.1 type is typically implemented using this module by implementing

1. an Asn1Value subclass, which will be most likely a subclass of Asn1Sequence, Asn1SequenceOf or Asn1SetOf
2. an instance creating function taking some "basic" Ceylon types as input, encode them using instance creating functions of other ASN.1 types and delegating to the constructor of the class implemented in step 1.
3. a Decoder subclass using the decodeSequence, decodeSequenceOf or decodeSetOf function.