copy over a few files for now

2024-04-08 16:30:46 -07:00
parent d61fc5f32e
commit 71721b5943
16 changed files with 908 additions and 2 deletions
@@ -0,0 +1,97 @@
+import { Jwk } from './jwk.js'
+
+declare const process: undefined | { versions?: { node?: string } }
+const IS_NODE_RUNTIME =
+  typeof process !== 'undefined' && typeof process?.versions?.node === 'string'
+
+export function* jwkAlgorithms(jwk: Jwk): Generator<string> {
+  // Ed25519, Ed448, and secp256k1 always have "alg"
+  // OKP always has "use"
+  if (jwk.alg) {
+    yield jwk.alg
+    return
+  }
+
+  switch (jwk.kty) {
+    case 'EC': {
+      if (jwk.use === 'enc' || jwk.use === undefined) {
+        yield 'ECDH-ES'
+        yield 'ECDH-ES+A128KW'
+        yield 'ECDH-ES+A192KW'
+        yield 'ECDH-ES+A256KW'
+      }
+
+      if (jwk.use === 'sig' || jwk.use === undefined) {
+        const crv = 'crv' in jwk ? jwk.crv : undefined
+        switch (crv) {
+          case 'P-256':
+          case 'P-384':
+            yield `ES${crv.slice(-3)}`.replace('21', '12')
+            break
+          case 'P-521':
+            yield 'ES512'
+            break
+          case 'secp256k1':
+            if (IS_NODE_RUNTIME) yield 'ES256K'
+            break
+          default:
+            throw new TypeError(`Unsupported crv "${crv}"`)
+        }
+      }
+
+      return
+    }
+
+    case 'OKP': {
+      if (!jwk.use) throw new TypeError('Missing "use" Parameter value')
+      yield 'ECDH-ES'
+      yield 'ECDH-ES+A128KW'
+      yield 'ECDH-ES+A192KW'
+      yield 'ECDH-ES+A256KW'
+      return
+    }
+
+    case 'RSA': {
+      if (jwk.use === 'enc' || jwk.use === undefined) {
+        yield 'RSA-OAEP'
+        yield 'RSA-OAEP-256'
+        yield 'RSA-OAEP-384'
+        yield 'RSA-OAEP-512'
+        if (IS_NODE_RUNTIME) yield 'RSA1_5'
+      }
+
+      if (jwk.use === 'sig' || jwk.use === undefined) {
+        yield 'PS256'
+        yield 'PS384'
+        yield 'PS512'
+        yield 'RS256'
+        yield 'RS384'
+        yield 'RS512'
+      }
+
+      return
+    }
+
+    case 'oct': {
+      if (jwk.use === 'enc' || jwk.use === undefined) {
+        yield 'A128GCMKW'
+        yield 'A192GCMKW'
+        yield 'A256GCMKW'
+        yield 'A128KW'
+        yield 'A192KW'
+        yield 'A256KW'
+      }
+
+      if (jwk.use === 'sig' || jwk.use === undefined) {
+        yield 'HS256'
+        yield 'HS384'
+        yield 'HS512'
+      }
+
+      return
+    }
+
+    default:
+      throw new Error(`Unsupported kty "${jwk.kty}"`)
+  }
+}