Class MessageImprint

MessageImprint structure for RFC 3161 Time-Stamp Protocol.

MessageImprint contains the hash of the data to be time-stamped along with the algorithm used to compute the hash. This ensures the integrity of the timestamped data by binding the timestamp to a specific hash value.

Asn

MessageImprint ::= SEQUENCE {
  hashAlgorithm     AlgorithmIdentifier,
  hashedMessage     OCTET STRING
}

See

RFC 3161 Section 2.4.1 - TSAReq Structure

Hierarchy (View Summary)

PkiBase<MessageImprint>
- MessageImprint

Index

Constructors

constructor

new MessageImprint(
    options: {
        hashAlgorithm: AlgorithmIdentifier;
        hashedMessage: Uint8Array;
    },
): MessageImprint
Creates a new MessageImprint instance.
Parameters
- options: { hashAlgorithm: AlgorithmIdentifier; hashedMessage: Uint8Array }
  Configuration object
  - hashAlgorithm: AlgorithmIdentifier
    The hash algorithm identifier
  - hashedMessage: Uint8Array
    The computed hash value
Returns MessageImprint
Example
```
const messageImprint = new MessageImprint({
    hashAlgorithm: AlgorithmIdentifier.hashAlgorithm({ type: 'SHA-256' }),
    hashedMessage: hashBytes
})
```
Overrides PkiBase.constructor
- Defined in packages/pki-lite/src/timestamp/MessageImprint.ts:44

Properties

hashAlgorithm

hashAlgorithm: AlgorithmIdentifier

Algorithm used to hash the message

hashedMessage

hashedMessage: Uint8Array

The hash value of the message to be timestamped

Accessors

pemHeader

get pemHeader(): string
Gets the PEM header name for this object type. Converts the class name to uppercase for use in PEM encoding.

Returns string
Inherited from PkiBase.pemHeader
- Defined in packages/pki-lite/src/core/PkiBase.ts:60

pkiType

get pkiType(): string
Gets the PKI type name for this object (typically the class name). Used for PEM headers and debugging output.

Returns string
Inherited from PkiBase.pkiType
- Defined in packages/pki-lite/src/core/PkiBase.ts:52

Methods

equals

equals(other: PkiBase<any>): boolean
Compares this PKI object with another for equality. Two objects are considered equal if their DER encodings are identical.
Parameters
- other: PkiBase<any>
  The other PKI object to compare with
Returns boolean
true if the objects are equal, false otherwise
Inherited from PkiBase.equals
- Defined in packages/pki-lite/src/core/PkiBase.ts:122

parseAs

parseAs<T>(type: ParseableAsn1<T>): T
Parses this object as a different PKI type. Useful for converting between related PKI structures.
Type Parameters
- T
  The target type to parse as
Parameters
- type: ParseableAsn1<T>
  The target type constructor with parsing capabilities
Returns T
A new instance of the target type
Inherited from PkiBase.parseAs
- Defined in packages/pki-lite/src/core/PkiBase.ts:134

toAsn1

toAsn1(): Asn1BaseBlock
Converts the MessageImprint to its ASN.1 representation.

Returns Asn1BaseBlock
ASN.1 SEQUENCE containing the hash algorithm and hashed message
Example
```
const asn1 = messageImprint.toAsn1()
const der = asn1.toBER(false)
```
Overrides PkiBase.toAsn1
- Defined in packages/pki-lite/src/timestamp/MessageImprint.ts:67

toDer

toDer(): Uint8Array
Converts this PKI object to DER (Distinguished Encoding Rules) format.

Returns Uint8Array
The DER-encoded bytes of this object
Inherited from PkiBase.toDer
- Defined in packages/pki-lite/src/core/PkiBase.ts:100

toHumanString

toHumanString(): string
Returns a human-readable string representation of this object. By default, returns the same as toString(), but subclasses can override for more user-friendly output.

Returns string
A human-readable string representation
Inherited from PkiBase.toHumanString
- Defined in packages/pki-lite/src/core/PkiBase.ts:90

toJSON

toJSON(): ToJson<T>
Converts this object to a JSON representation.

Returns ToJson<T>
A JSON-serializable representation of this object
Inherited from PkiBase.toJSON
- Defined in packages/pki-lite/src/core/PkiBase.ts:69

toPem

toPem(): string
Converts this PKI object to PEM (Privacy-Enhanced Mail) format.

Returns string
A PEM-encoded string with appropriate headers
Inherited from PkiBase.toPem
- Defined in packages/pki-lite/src/core/PkiBase.ts:109

toString

toString(): string
Returns a string representation of this PKI object. Includes the type name and ASN.1 structure.

Returns string
A string representation for debugging
Inherited from PkiBase.toString
- Defined in packages/pki-lite/src/core/PkiBase.ts:79

`Static`fromAsn1

fromAsn1(asn1: Asn1BaseBlock): MessageImprint
Creates a MessageImprint from an ASN.1 structure.

Parses the ASN.1 SEQUENCE and extracts the hash algorithm and hashed message.
Parameters
- asn1: Asn1BaseBlock
  The ASN.1 structure to parse
Returns MessageImprint
The parsed MessageImprint object
Throws
Asn1ParseError if the ASN.1 structure is invalid
Example
```
const asn1 = derToAsn1(messageImprintBytes)
const messageImprint = MessageImprint.fromAsn1(asn1)

console.log(messageImprint.hashAlgorithm.algorithm) // Hash algorithm OID
console.log(messageImprint.hashedMessage) // Hash bytes
```
- Defined in packages/pki-lite/src/timestamp/MessageImprint.ts:96

Class MessageImprint

Asn

See

Hierarchy (View Summary)

Index

Constructors

Properties

Accessors

Methods

Constructors

constructor

Parameters

hashAlgorithm: AlgorithmIdentifier

hashedMessage: Uint8Array

Returns MessageImprint

Example

Properties

hashAlgorithm

hashedMessage

Accessors

pemHeader

Returns string

pkiType

Returns string

Methods

equals

Parameters

Returns boolean

parseAs

Type Parameters

Parameters

Returns T

toAsn1

Returns Asn1BaseBlock

Example

toDer

Returns Uint8Array

toHumanString

Returns string

toJSON

Returns ToJson<T>

toPem

Returns string

toString

Returns string

StaticfromAsn1

Parameters

Returns MessageImprint

Throws

Example

Settings

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`Static`fromAsn1