Description
Return octet = length for BER's short definite-length form.
ASN.1 BER encodes values as identifiers, lengths and content; DER constrains representation to a canonical form. Content octets, first-tag octets and length prefixes are only parts of a complete encoded value.
Return octet = length for BER's short definite-length form.
When to use this tool
Use Encoding: Ber Short Length Octet when inspecting one explicit ASN.1 encoding component.
How to use the tool and how it works
- Enter length. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read result. Expand result to inspect the returned fields.
Require whole length in [0,127]. Return octet = length for BER's short definite-length form.1
ASN.1 encodings distinguish identifier, length and content octets. DER adds canonical constraints; the local output still needs its surrounding encoding.2
| Input field | Meaning and units | Accepted input |
|---|---|---|
| length | Length | Required. Safe integer. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| result | Object containing the named calculated members below. | Required. Object. |
| result.octet | Octet | Calculated result member: number. |
{
"input": {
"length": 127
},
"output": {
"result": {
"octet": 127
}
}
}Limitations and assumptions
- This emits one length byte only. Longer lengths, indefinite length, tag bytes and payload construction require separate operations.
- Outputs are nested inside result. Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Use an appropriate complete ASN.1 encoder and schema for canonical full values, nested lengths and application semantics.
References
-
Calculation and input contract: encode/ber-short-length-octet — tool.io
-
ASN.1 encoding rules: ITU-T X.690 (12/1997) — International Telecommunication Union
Similar or alternative tools
- BER Tag First Octet From Fields
Return octet = tagClass*64+(constructed ? 32 : 0)+tagNumber.
- CBOR Simple Value Initial Octet Tool
Encode one CBOR simple value, rejecting the reserved simple values 24..31.