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Fixed the function considering the new library
Old ASN library is replaced by the new one because it has high no. of downloads/week although the last commit is 2 years old.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,77 +1,23 @@ | ||
| import { | ||
| ASN1Construction, | ||
| ASN1TagClass, | ||
| ASN1UniversalType, | ||
| DERElement, | ||
| ObjectIdentifier, | ||
| } from 'asn1-ts' | ||
|
|
||
| /** | ||
| * Represents an ASN.1 AlgorithmIdentifier structure commonly used in cryptographic protocols. | ||
| * This class handles the construction and DER encoding of an algorithm identifier, which typically | ||
| * consists of an algorithm OID and optional parameters. | ||
| */ | ||
| class AlgorithmIdentifier { | ||
| public algorithm: ObjectIdentifier | ||
| public parameters: null | ||
|
|
||
| /** | ||
| * Creates an instance of AlgorithmIdentifier. | ||
| * | ||
| * @param algorithm The ObjectIdentifier of the algorithm. | ||
| * @param parameters The parameters of the algorithm, generally null in many cryptographic uses. | ||
| */ | ||
| constructor(algorithm: ObjectIdentifier, parameters: null = null) { | ||
| this.algorithm = algorithm | ||
| this.parameters = parameters | ||
| } | ||
|
|
||
| /** | ||
| * Encodes this AlgorithmIdentifier into its DER (Distinguished Encoding Rules) format. | ||
| * | ||
| * @returns Uint8Array containing the DER encoded bytes of the AlgorithmIdentifier. | ||
| */ | ||
| public toDER(): Uint8Array { | ||
| const sequenceElement = new DERElement( | ||
| ASN1TagClass.universal, | ||
| ASN1Construction.constructed, | ||
| ASN1UniversalType.sequence, | ||
| ) | ||
|
|
||
| const oidElement = new DERElement( | ||
| ASN1TagClass.universal, | ||
| ASN1Construction.primitive, | ||
| ASN1UniversalType.objectIdentifier, | ||
| ) | ||
| oidElement.objectIdentifier = this.algorithm | ||
|
|
||
| const nullElement = new DERElement( | ||
| ASN1TagClass.universal, | ||
| ASN1Construction.primitive, | ||
| ASN1UniversalType.nill, | ||
| ) | ||
|
|
||
| sequenceElement.sequence = [oidElement, nullElement] | ||
|
|
||
| return sequenceElement.toBytes() | ||
| } | ||
| } | ||
| import { ObjectIdentifier } from 'asn1js' | ||
|
|
||
| /** | ||
| * Encodes a given string representation of an OID into its DER format. | ||
| * This function is specifically used to encode signature algorithm OIDs. | ||
| * | ||
| * @param oid The string representation of the ObjectIdentifier to be encoded. | ||
| * @returns Uint8Array containing the DER encoded OID. | ||
| * @example | ||
| * ```ts | ||
| * const oid = '1.2.840.113549.1.1.11' // Example OID for SHA-256 with RSA Encryption | ||
| * const derEncodedOID = derEncodeSignatureAlgorithmOID(oid) | ||
| * console.log(new Uint8Array(derEncodedOID)) // Logs the DER encoded bytes | ||
| * ``` | ||
| * @returns Uint8Array containing the DER encoded OID along with NULL params of X.509 signature algorithm. | ||
| */ | ||
| export function derEncodeSignatureAlgorithmOID(oid: string): Uint8Array { | ||
| const numbers = oid.split('.').map((n) => parseInt(n, 10)) // Convert the string parts to numbers | ||
| const algorithmIdentifier = new AlgorithmIdentifier(new ObjectIdentifier(numbers)) | ||
| return algorithmIdentifier.toDER() | ||
| const objectIdentifier = new ObjectIdentifier({ value: oid }) | ||
| const berArrayBuffer = objectIdentifier.toBER(false) | ||
|
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||
| // Typically, in X.509, the algorithm identifier is followed by parameters; for many algorithms, this is just NULL. | ||
| const nullParameter = [0x05, 0x00] // DER encoding for NULL | ||
|
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||
| // Calculate the total length including OID and NULL parameter | ||
| const totalLength = berArrayBuffer.byteLength + nullParameter.length | ||
|
|
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| const sequenceHeader = [0x30, totalLength] // 0x30 is the DER tag for SEQUENCE | ||
|
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||
| return new Uint8Array([...sequenceHeader, ...new Uint8Array(berArrayBuffer), ...nullParameter]) | ||
| } |
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