type: define IANA hash algorithm list once (#268)

Signed-off-by: Sami Rosendahl <sami.rosendahl@reaktor.com>

Author: srosenda

packages/core/src/index.ts

@@ -17,6 +17,7 @@ import {
   type SDJWTConfig,
   type JwtPayload,
   type Signer,
+  IANA_HASH_ALGORITHMS,
   type HashAlgorithm,
 } from '@sd-jwt/types';
 import { getSDAlgAndPayload } from '@sd-jwt/decode';
@@ -32,26 +33,6 @@ export * from './generalJSON';
 
 export type SdJwtPayload = Record<string, unknown>;
 
-const IANA_HASH_ALGORITHMS: HashAlgorithm[] = [
-  'sha-256',
-  'sha-256-128',
-  'sha-256-120',
-  'sha-256-96',
-  'sha-256-64',
-  'sha-256-32',
-  'sha-384',
-  'sha-512',
-  'sha3-224',
-  'sha3-256',
-  'sha3-384',
-  'sha3-512',
-  'blake2s-256',
-  'blake2b-256',
-  'blake2b-512',
-  'k12-256',
-  'k12-512',
-];
-
 export class SDJwtInstance<ExtendedPayload extends SdJwtPayload> {
   //header type
   protected type?: string;

packages/types/src/type.ts

@@ -10,24 +10,28 @@ export type Base64urlString = string;
 export type DisclosureData<T> = [string, string, T] | [string, T];
 
 // based on https://www.iana.org/assignments/named-information/named-information.xhtml
-export type HashAlgorithm =
-  | 'sha-256'
-  | 'sha-256-128'
-  | 'sha-256-120'
-  | 'sha-256-96'
-  | 'sha-256-64'
-  | 'sha-256-32'
-  | 'sha-384'
-  | 'sha-512'
-  | 'sha3-224'
-  | 'sha3-256'
-  | 'sha3-384'
-  | 'sha3-512'
-  | 'blake2s-256'
-  | 'blake2b-256'
-  | 'blake2b-512'
-  | 'k12-256'
-  | 'k12-512';
+export const IANA_HASH_ALGORITHMS = [
+  'sha-256',
+  'sha-256-128',
+  'sha-256-120',
+  'sha-256-96',
+  'sha-256-64',
+  'sha-256-32',
+  'sha-384',
+  'sha-512',
+  'sha3-224',
+  'sha3-256',
+  'sha3-384',
+  'sha3-512',
+  'blake2s-256',
+  'blake2b-256',
+  'blake2b-512',
+  'k12-256',
+  'k12-512',
+] as const;
+
+export type HashAlgorithm = (typeof IANA_HASH_ALGORITHMS)[number];
+
 
 export type SDJWTConfig = {
   omitTyp?: boolean;