Class: DerNode

DerNode(nodeType)

new DerNode(nodeType)

DerNode implements the DER node types used in encoding/decoding DER-formatted data. Create a generic DER node with the given nodeType. This is a private constructor used by one of the public DerNode subclasses defined below.
Parameters:
Name Type Description
nodeType number One of the defined DER DerNodeType constants.
Source:

Methods

(static) DerBitString(inputBuf, paddingLen)

A DerBitString extends DerNode to handle a bit string. Create a DerBitString with the given padding and inputBuf.
Parameters:
Name Type Description
inputBuf Buffer An input buffer containing the bit octets to encode.
paddingLen number The number of bits of padding at the end of the bit string. Should be less than 8.
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(static) DerBoolean(value)

DerBoolean extends DerNode to encode a boolean value. Create a new DerBoolean for the value.
Parameters:
Name Type Description
value boolean The value to encode.
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(static) DerByteString(inputData, nodeType)

A DerByteString extends DerNode to handle byte strings. Create a DerByteString with the given inputData and nodeType. This is a private constructor used by one of the public subclasses such as DerOctetString or DerPrintableString.
Parameters:
Name Type Description
inputData Buffer An input buffer containing the string to encode.
nodeType number One of the defined DER DerNodeType constants.
Source:

(static) DerGeneralizedTime(msSince1970)

A DerGeneralizedTime extends DerNode to represent a date and time, with millisecond accuracy. Create a DerGeneralizedTime with the given milliseconds since 1970.
Parameters:
Name Type Description
msSince1970 number The timestamp as milliseconds since Jan 1, 1970.
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(static) DerInteger(integer)

DerInteger extends DerNode to encode an integer value. Create a new DerInteger for the value.
Parameters:
Name Type Description
integer number | Buffer The value to encode. If integer is a Buffer byte array of a positive integer, you must ensure that the first byte is less than 0x80.
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(static) DerNull()

A DerNull extends DerNode to encode a null value. Create a DerNull.
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(static) DerOctetString(inputData)

DerOctetString extends DerByteString to encode a string of bytes. Create a new DerOctetString for the inputData.
Parameters:
Name Type Description
inputData Buffer An input buffer containing the string to encode.
Source:

(static) DerOid(oid)

A DerOid extends DerNode to represent an object identifier. Create a DerOid with the given object identifier. The object identifier string must begin with 0,1, or 2 and must contain at least 2 digits.
Parameters:
Name Type Description
oid string | OID The OID string or OID object to encode.
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(static) DerPrintableString(inputData)

A DerPrintableString extends DerByteString to handle a a printable string. No escaping or other modification is done to the string. Create a DerPrintableString with the given inputData.
Parameters:
Name Type Description
inputData Buffer An input buffer containing the string to encode.
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(static) DerSequence()

A DerSequence extends DerStructure to contains an ordered sequence of other nodes. Create a DerSequence.
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(static) DerStructure(nodeType)

A DerStructure extends DerNode to hold other DerNodes. Create a DerStructure with the given nodeType. This is a private constructor. To create an object, use DerSequence.
Parameters:
Name Type Description
nodeType number One of the defined DER DerNodeType constants.
Source:

(static) getSequence(children, index) → {DerNode.DerSequence}

Check that index is in bounds for the children list, return children[index].
Parameters:
Name Type Description
children Array.<DerNode> The list of DerNode, usually returned by another call to getChildren.
index number The index of the children.
Source:
Throws:
DerDecodingException if index is out of bounds or if children[index] is not a DerSequence.
Returns:
children[index].
Type
DerNode.DerSequence

(static) parse(inputBuf, startIdx) → {DerNode}

Parse the data from the input buffer recursively and return the root as an object of a subclass of DerNode.
Parameters:
Name Type Description
inputBuf Buffer The input buffer to read from.
startIdx number (optional) The offset into the buffer. If omitted, use 0.
Source:
Returns:
An object of a subclass of DerNode.
Type
DerNode

decode(inputBuf, startIdx)

Decode and store the data from an input buffer.
Parameters:
Name Type Description
inputBuf Buffer The input buffer to read from. This reads from startIdx (regardless of the buffer's position) and does not change the position.
startIdx number The offset into the buffer.
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decodeHeader(inputBuf, startIdx) → {number}

Extract the header from an input buffer and return the size.
Parameters:
Name Type Description
inputBuf Buffer The input buffer to read from.
startIdx number The offset into the buffer.
Source:
Returns:
The parsed size in the header.
Type
number

encode() → {Blob}

Get the raw data encoding for this node.
Source:
Returns:
The raw data encoding.
Type
Blob

encodeHeader(size)

Encode the given size and update the header.
Parameters:
Name Type Description
size number
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getChildren() → {Array.<DerNode>}

If this object is a DerNode.DerSequence, get the children of this node. Otherwise, throw an exception. (DerSequence overrides to implement this method.)
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Throws:
DerDecodingException if this object is not a DerSequence.
Returns:
The children as an array of DerNode.
Type
Array.<DerNode>

getPayload() → {Blob}

Get a copy of the payload bytes.
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Returns:
A copy of the payload.
Type
Blob

getSize() → {number}

Return the number of bytes in DER
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Returns:
Type
number

payloadAppend(buffer)

Copy buffer to this.payload_ at this.payloadPosition_ and update this.payloadPosition_.
Parameters:
Name Type Description
buffer Buffer The buffer to copy.
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toVal() → {Blob}

Convert the encoded data to a standard representation. Overridden by some subclasses (e.g. DerBoolean).
Source:
Returns:
The encoded data as a Blob.
Type
Blob