René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Key usages should be an unique set","articleBody":"```js\n\u003e const k = await crypto.subtle.exportKey('jwk', await crypto.subtle.generateKey({name: \"ChaCha20-Poly1305\" }, true, ['encrypt']))\n\u003e await crypto.subtle.importKey('jwk', k, \"ChaCha20-Poly1305\", true, ['encrypt', 'encrypt'])\nCryptoKey {\n  type: 'secret',\n  extractable: true,\n  algorithm: { name: 'ChaCha20-Poly1305' },\n  usages: [ 'encrypt', 'encrypt' ] // duplicated\n}\n\u003e await crypto.subtle.exportKey('jwk', _)\n{\n  key_ops: [ 'encrypt', 'encrypt' ], // duplicated\n  ext: true,\n  alg: 'C20P',\n  kty: 'oct',\n  k: '...'\n}\n```\n\n```js\n\u003e const k = await crypto.subtle.exportKey('jwk', await crypto.subtle.generateKey({name: \"AES-GCM\", length: 256 }, true, ['encrypt']))\nundefined\n\u003e await crypto.subtle.importKey('jwk', k, {name: \"AES-GCM\", length: 256 }, true, ['encrypt', 'encrypt'])\nCryptoKey {\n  type: 'secret',\n  extractable: true,\n  algorithm: { name: 'AES-GCM', length: 256 },\n  usages: [ 'encrypt', 'encrypt' ] // duplicated\n}\n\u003e await crypto.subtle.exportKey('jwk', _)\n{\n  key_ops: [ 'encrypt', 'encrypt' ], // duplicated\n  ext: true,\n  alg: 'A256GCM',\n  kty: 'oct',\n  k: '...'\n}\n```\n\n```js\n\u003e k = await crypto.subtle.generateKey({ name: \"RSA-OAEP\", hash: \"SHA-256\", modulusLength: 2048, publicExponent: Uint8Array.of(1, 0, 1) }, true, [ 'encrypt', 'decrypt'])\n\u003e p = await crypto.subtle.exportKey('jwk', k.publicKey)\n\u003e await crypto.subtle.importKey('jwk', p, { name: \"RSA-OAEP\", hash: \"SHA-256\" }, true, ['encrypt', 'encrypt'])\nCryptoKey {\n  type: 'public',\n  extractable: true,\n  algorithm: {\n    name: 'RSA-OAEP',\n    modulusLength: 2048,\n    publicExponent: [Uint8Array],\n    hash: [Object]\n  },\n  usages: [ 'encrypt', 'encrypt' ] // duplicate\n}\n\u003e await crypto.subtle.exportKey('jwk', _)\n{\n  key_ops: [ 'encrypt', 'encrypt' ], // duplicate\n  ext: true,\n  alg: 'RSA-OAEP-256',\n  kty: 'RSA',\n  n: '...',\n  e: 'AQAB'\n}\n```\n\nChrome deduplicates:\n\n\u003cimg width=\"707\" height=\"117\" alt=\"Image\" src=\"https://github.com/user-attachments/assets/f0356072-3441-49ec-b8b9-71b684709e4b\" /\u003e\n\nSource:\n\n### chacha20_poly1305\n\nhttps://github.com/nodejs/node/blob/HEAD/lib/internal/crypto/chacha20_poly1305.js#L143\n\n\u003cimg width=\"1066\" height=\"109\" alt=\"Image\" src=\"https://github.com/user-attachments/assets/dc2d7727-e6b9-4090-8b7e-6dfb090c389b\" /\u003e\n\n### aes\n\nhttps://github.com/nodejs/node/blob/HEAD/lib/internal/crypto/aes.js#L288\n\n\u003cimg width=\"1066\" height=\"109\" alt=\"Image\" src=\"https://github.com/user-attachments/assets/51de1d4d-5013-426d-873c-24f97d27cee1\" /\u003e\n\n### rsa\n\nhttps://github.com/nodejs/node/blob/HEAD/lib/internal/crypto/rsa.js#L284\n\n\u003cimg width=\"1051\" height=\"92\" alt=\"Image\" src=\"https://github.com/user-attachments/assets/aa613aea-5e02-499e-b35e-2b0e738ea1aa\" /\u003e","author":{"url":"https://github.com/ChALkeR","@type":"Person","name":"ChALkeR"},"datePublished":"2026-04-22T21:47:56.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/62899/node/issues/62899"}