crypto: add KeyObject.prototype.toCryptoKey

PR-URL: nodejs#55262 Reviewed-By: James M Snell <[email protected]> Reviewed-By: Yagiz Nizipli <[email protected]> Reviewed-By: Tobias Nießen <[email protected]>
tpoisseau · Nov 21, 2024 · 1866692 · 1866692
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diff --git a/doc/api/crypto.md b/doc/api/crypto.md
@@ -2136,6 +2136,24 @@ added: v11.6.0
 For secret keys, this property represents the size of the key in bytes. This
 property is `undefined` for asymmetric keys.
 
+### `keyObject.toCryptoKey(algorithm, extractable, keyUsages)`
+
+<!-- YAML
+added: REPLACEME
+-->
+
+<!--lint disable maximum-line-length remark-lint-->
+
+* `algorithm`: {AlgorithmIdentifier|RsaHashedImportParams|EcKeyImportParams|HmacImportParams}
+
+<!--lint enable maximum-line-length remark-lint-->
+
+* `extractable`: {boolean}
+* `keyUsages`: {string\[]} See [Key usages][].
+* Returns: {CryptoKey}
+
+Converts a `KeyObject` instance to a `CryptoKey`.
+
 ### `keyObject.type`
 
 <!-- YAML
@@ -6087,6 +6105,7 @@ See the [list of SSL OP Flags][] for details.
 [FIPS provider from OpenSSL 3]: https://www.openssl.org/docs/man3.0/man7/crypto.html#FIPS-provider
 [HTML 5.2]: https://www.w3.org/TR/html52/changes.html#features-removed
 [JWK]: https://tools.ietf.org/html/rfc7517
+[Key usages]: webcrypto.md#cryptokeyusages
 [NIST SP 800-131A]: https://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-131Ar2.pdf
 [NIST SP 800-132]: https://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-132.pdf
 [NIST SP 800-38D]: https://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-38d.pdf

diff --git a/lib/internal/crypto/aes.js b/lib/internal/crypto/aes.js
@@ -245,7 +245,7 @@ async function aesGenerateKey(algorithm, extractable, keyUsages) {
     extractable);
 }
 
-async function aesImportKey(
+function aesImportKey(
   algorithm,
   format,
   keyData,
@@ -266,6 +266,11 @@ async function aesImportKey(
   let keyObject;
   let length;
   switch (format) {
+    case 'KeyObject': {
+      validateKeyLength(keyData.symmetricKeySize * 8);
+      keyObject = keyData;
+      break;
+    }
     case 'raw': {
       validateKeyLength(keyData.byteLength * 8);
       keyObject = createSecretKey(keyData);

diff --git a/lib/internal/crypto/cfrg.js b/lib/internal/crypto/cfrg.js
@@ -197,7 +197,7 @@ function cfrgExportKey(key, format) {
     key[kKeyObject][kHandle]));
 }
 
-async function cfrgImportKey(
+function cfrgImportKey(
   format,
   keyData,
   algorithm,
@@ -208,6 +208,11 @@ async function cfrgImportKey(
   let keyObject;
   const usagesSet = new SafeSet(keyUsages);
   switch (format) {
+    case 'KeyObject': {
+      verifyAcceptableCfrgKeyUse(name, keyData.type === 'public', usagesSet);
+      keyObject = keyData;
+      break;
+    }
     case 'spki': {
       verifyAcceptableCfrgKeyUse(name, true, usagesSet);
       try {

diff --git a/lib/internal/crypto/ec.js b/lib/internal/crypto/ec.js
@@ -149,7 +149,7 @@ function ecExportKey(key, format) {
     key[kKeyObject][kHandle]));
 }
 
-async function ecImportKey(
+function ecImportKey(
   format,
   keyData,
   algorithm,
@@ -167,6 +167,11 @@ async function ecImportKey(
   let keyObject;
   const usagesSet = new SafeSet(keyUsages);
   switch (format) {
+    case 'KeyObject': {
+      verifyAcceptableEcKeyUse(name, keyData.type === 'public', usagesSet);
+      keyObject = keyData;
+      break;
+    }
     case 'spki': {
       verifyAcceptableEcKeyUse(name, true, usagesSet);
       try {

diff --git a/lib/internal/crypto/keys.js b/lib/internal/crypto/keys.js
@@ -6,6 +6,7 @@ const {
   ObjectDefineProperties,
   ObjectDefineProperty,
   ObjectSetPrototypeOf,
+  SafeSet,
   Symbol,
   SymbolToStringTag,
   Uint8Array,
@@ -49,6 +50,8 @@ const {
   kKeyObject,
   getArrayBufferOrView,
   bigIntArrayToUnsignedBigInt,
+  normalizeAlgorithm,
+  hasAnyNotIn,
 } = require('internal/crypto/util');
 
 const {
@@ -65,6 +68,7 @@ const {
 const {
   customInspectSymbol: kInspect,
   kEnumerableProperty,
+  lazyDOMException,
 } = require('internal/util');
 
 const { inspect } = require('internal/util/inspect');
@@ -148,6 +152,8 @@ const {
     },
   });
 
+  let webidl;
+
   class SecretKeyObject extends KeyObject {
     constructor(handle) {
       super('secret', handle);
@@ -168,6 +174,51 @@ const {
       }
       return this[kHandle].export();
     }
+
+    toCryptoKey(algorithm, extractable, keyUsages) {
+      webidl ??= require('internal/crypto/webidl');
+      algorithm = normalizeAlgorithm(webidl.converters.AlgorithmIdentifier(algorithm), 'importKey');
+      extractable = webidl.converters.boolean(extractable);
+      keyUsages = webidl.converters['sequence<KeyUsage>'](keyUsages);
+
+      let result;
+      switch (algorithm.name) {
+        case 'HMAC':
+          result = require('internal/crypto/mac')
+            .hmacImportKey('KeyObject', this, algorithm, extractable, keyUsages);
+          break;
+        case 'AES-CTR':
+          // Fall through
+        case 'AES-CBC':
+          // Fall through
+        case 'AES-GCM':
+          // Fall through
+        case 'AES-KW':
+          result = require('internal/crypto/aes')
+            .aesImportKey(algorithm, 'KeyObject', this, extractable, keyUsages);
+          break;
+        case 'HKDF':
+          // Fall through
+        case 'PBKDF2':
+          result = importGenericSecretKey(
+            algorithm,
+            'KeyObject',
+            this,
+            extractable,
+            keyUsages);
+          break;
+        default:
+          throw lazyDOMException('Unrecognized algorithm name', 'NotSupportedError');
+      }
+
+      if (result.usages.length === 0) {
+        throw lazyDOMException(
+          `Usages cannot be empty when importing a ${result.type} key.`,
+          'SyntaxError');
+      }
+
+      return result;
+    }
   }
 
   const kAsymmetricKeyType = Symbol('kAsymmetricKeyType');
@@ -209,6 +260,51 @@ const {
           return {};
       }
     }
+
+    toCryptoKey(algorithm, extractable, keyUsages) {
+      webidl ??= require('internal/crypto/webidl');
+      algorithm = normalizeAlgorithm(webidl.converters.AlgorithmIdentifier(algorithm), 'importKey');
+      extractable = webidl.converters.boolean(extractable);
+      keyUsages = webidl.converters['sequence<KeyUsage>'](keyUsages);
+
+      let result;
+      switch (algorithm.name) {
+        case 'RSASSA-PKCS1-v1_5':
+          // Fall through
+        case 'RSA-PSS':
+          // Fall through
+        case 'RSA-OAEP':
+          result = require('internal/crypto/rsa')
+            .rsaImportKey('KeyObject', this, algorithm, extractable, keyUsages);
+          break;
+        case 'ECDSA':
+          // Fall through
+        case 'ECDH':
+          result = require('internal/crypto/ec')
+            .ecImportKey('KeyObject', this, algorithm, extractable, keyUsages);
+          break;
+        case 'Ed25519':
+          // Fall through
+        case 'Ed448':
+          // Fall through
+        case 'X25519':
+          // Fall through
+        case 'X448':
+          result = require('internal/crypto/cfrg')
+            .cfrgImportKey('KeyObject', this, algorithm, extractable, keyUsages);
+          break;
+        default:
+          throw lazyDOMException('Unrecognized algorithm name', 'NotSupportedError');
+      }
+
+      if (result.type === 'private' && result.usages.length === 0) {
+        throw lazyDOMException(
+          `Usages cannot be empty when importing a ${result.type} key.`,
+          'SyntaxError');
+      }
+
+      return result;
+    }
   }
 
   class PublicKeyObject extends AsymmetricKeyObject {
@@ -801,6 +897,68 @@ function isCryptoKey(obj) {
   return obj != null && obj[kKeyObject] !== undefined;
 }
 
+function importGenericSecretKey(
+  { name, length },
+  format,
+  keyData,
+  extractable,
+  keyUsages) {
+  const usagesSet = new SafeSet(keyUsages);
+  if (extractable)
+    throw lazyDOMException(`${name} keys are not extractable`, 'SyntaxError');
+
+  if (hasAnyNotIn(usagesSet, ['deriveKey', 'deriveBits'])) {
+    throw lazyDOMException(
+      `Unsupported key usage for a ${name} key`,
+      'SyntaxError');
+  }
+
+  switch (format) {
+    case 'KeyObject': {
+      if (hasAnyNotIn(usagesSet, ['deriveKey', 'deriveBits'])) {
+        throw lazyDOMException(
+          `Unsupported key usage for a ${name} key`,
+          'SyntaxError');
+      }
+
+      const checkLength = keyData.symmetricKeySize * 8;
+
+      // The Web Crypto spec allows for key lengths that are not multiples of
+      // 8. We don't. Our check here is stricter than that defined by the spec
+      // in that we require that algorithm.length match keyData.length * 8 if
+      // algorithm.length is specified.
+      if (length !== undefined && length !== checkLength) {
+        throw lazyDOMException('Invalid key length', 'DataError');
+      }
+      return new InternalCryptoKey(keyData, { name }, keyUsages, false);
+    }
+    case 'raw': {
+      if (hasAnyNotIn(usagesSet, ['deriveKey', 'deriveBits'])) {
+        throw lazyDOMException(
+          `Unsupported key usage for a ${name} key`,
+          'SyntaxError');
+      }
+
+      const checkLength = keyData.byteLength * 8;
+
+      // The Web Crypto spec allows for key lengths that are not multiples of
+      // 8. We don't. Our check here is stricter than that defined by the spec
+      // in that we require that algorithm.length match keyData.length * 8 if
+      // algorithm.length is specified.
+      if (length !== undefined && length !== checkLength) {
+        throw lazyDOMException('Invalid key length', 'DataError');
+      }
+
+      const keyObject = createSecretKey(keyData);
+      return new InternalCryptoKey(keyObject, { name }, keyUsages, false);
+    }
+  }
+
+  throw lazyDOMException(
+    `Unable to import ${name} key with format ${format}`,
+    'NotSupportedError');
+}
+
 module.exports = {
   // Public API.
   createSecretKey,
@@ -822,4 +980,5 @@ module.exports = {
   PrivateKeyObject,
   isKeyObject,
   isCryptoKey,
+  importGenericSecretKey,
 };
diff --git a/lib/internal/crypto/mac.js b/lib/internal/crypto/mac.js
@@ -82,7 +82,7 @@ function getAlgorithmName(hash) {
   }
 }
 
-async function hmacImportKey(
+function hmacImportKey(
   format,
   keyData,
   algorithm,
@@ -96,6 +96,24 @@ async function hmacImportKey(
   }
   let keyObject;
   switch (format) {
+    case 'KeyObject': {
+      const checkLength = keyData.symmetricKeySize * 8;
+
+      if (checkLength === 0 || algorithm.length === 0)
+        throw lazyDOMException('Zero-length key is not supported', 'DataError');
+
+      // The Web Crypto spec allows for key lengths that are not multiples of
+      // 8. We don't. Our check here is stricter than that defined by the spec
+      // in that we require that algorithm.length match keyData.length * 8 if
+      // algorithm.length is specified.
+      if (algorithm.length !== undefined &&
+          algorithm.length !== checkLength) {
+        throw lazyDOMException('Invalid key length', 'DataError');
+      }
+
+      keyObject = keyData;
+      break;
+    }
     case 'raw': {
       const checkLength = keyData.byteLength * 8;
 

diff --git a/lib/internal/crypto/rsa.js b/lib/internal/crypto/rsa.js
@@ -200,7 +200,7 @@ function rsaExportKey(key, format) {
     kRsaVariants[key.algorithm.name]));
 }
 
-async function rsaImportKey(
+function rsaImportKey(
   format,
   keyData,
   algorithm,
@@ -209,6 +209,11 @@ async function rsaImportKey(
   const usagesSet = new SafeSet(keyUsages);
   let keyObject;
   switch (format) {
+    case 'KeyObject': {
+      verifyAcceptableRsaKeyUse(algorithm.name, keyData.type === 'public', usagesSet);
+      keyObject = keyData;
+      break;
+    }
     case 'spki': {
       verifyAcceptableRsaKeyUse(algorithm.name, true, usagesSet);
       try {