Generated BER/DER/CER Encode Methods

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Two different types of BER (Basic Encoding Rules) encode methods may be generated using the ASN1C compiler:

• Memory-buffer based definite length backward encoders
• Stream-based indefinite length forward encoders

For DER (Distinguished Encoding Rules), only the first option is available because a requirement of DER is that all lengths must be in definite form. For CER (Canonical Encoding Rules), only the second option is available because all constructed element lengths must be in indefinite length form. Each of these methods are described in the following sections.