@credo-ts/core
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<p align="center"> <br /> <img alt="Credo Logo" src="https://github.com/openwallet-foundation/credo-ts/blob/c7886cb8377ceb8ee4efe8d264211e561a75072d/images/credo-logo.png" height="250px" /> </p> <h1 align="center"><b>Credo - Core</b></h1
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{"version":3,"file":"CredoWalletWebCrypto.mjs","names":[],"sources":["../../../src/crypto/webcrypto/CredoWalletWebCrypto.ts"],"sourcesContent":["import { p256, p384, p521 } from '@noble/curves/nist.js'\nimport { AsnConvert, AsnParser } from '@peculiar/asn1-schema'\nimport { SubjectPublicKeyInfo } from '@peculiar/asn1-x509'\nimport type { AgentContext } from '../../agent'\nimport { KeyManagementApi, PublicJwk } from '../../modules/kms'\nimport { Hasher } from '../hashes'\nimport { CredoWebCryptoError } from './CredoWebCryptoError'\nimport { CredoWebCryptoKey } from './CredoWebCryptoKey'\nimport {\n type JsonWebKey,\n type KeyFormat,\n type KeyGenAlgorithm,\n type KeyImportParams,\n type KeySignParams,\n type KeyUsage,\n type KeyVerifyParams,\n keyParamsToJwaAlgorithm,\n} from './types'\nimport { cryptoKeyAlgorithmToCreateKeyOptions, publicJwkToSpki, spkiToPublicJwk } from './utils'\n\nexport class CredoWalletWebCrypto {\n private kms: KeyManagementApi\n\n public constructor(agentContext: AgentContext) {\n this.kms = agentContext.resolve(KeyManagementApi)\n }\n\n public generateRandomValues<T extends ArrayBufferView | null>(array: T): T {\n if (!array) return array\n\n return this.kms.randomBytes({ length: array.byteLength }) as unknown as T\n }\n\n public async sign(key: CredoWebCryptoKey, message: Uint8Array, algorithm: KeySignParams): Promise<Uint8Array> {\n const jwaAlgorithm = keyParamsToJwaAlgorithm(algorithm, key)\n\n const keyId = key.publicJwk.keyId\n const { signature } = await this.kms.sign({\n keyId,\n data: message,\n algorithm: jwaAlgorithm,\n })\n\n return signature\n }\n\n public async verify(\n key: CredoWebCryptoKey,\n algorithm: KeyVerifyParams,\n message: Uint8Array,\n signature: Uint8Array\n ): Promise<boolean> {\n const publicKey = key.publicJwk.publicKey\n\n // TODO: with new KMS api we can now define custom algorithms\n // such as ES256-SHA384 to support these non-standard JWA combinatiosn\n // or we can do something like ES256-ph (pre-hashed for more generic)\n if (algorithm.name === 'ECDSA') {\n const hashAlg = typeof algorithm.hash === 'string' ? algorithm.hash : algorithm.hash.name\n if (publicKey.kty === 'EC' && publicKey.crv === 'P-256' && hashAlg !== 'SHA-256') {\n if (hashAlg !== 'SHA-384' && hashAlg !== 'SHA-512') {\n throw new CredoWebCryptoError(\n `Hash Alg: ${hashAlg} is not supported with key type ${publicKey.crv} currently`\n )\n }\n\n return p256.verify(signature, Hasher.hash(message, hashAlg.toLowerCase()), publicKey.publicKey, {\n // we use a custom hash\n prehash: false,\n lowS: false,\n })\n }\n if (publicKey.kty === 'EC' && publicKey.crv === 'P-384' && hashAlg !== 'SHA-384') {\n if (hashAlg !== 'SHA-256' && hashAlg !== 'SHA-512') {\n throw new CredoWebCryptoError(\n `Hash Alg: ${hashAlg} is not supported with key type ${publicKey.crv} currently`\n )\n }\n\n return p384.verify(signature, Hasher.hash(message, hashAlg.toLowerCase()), publicKey.publicKey, {\n // we use a custom hash\n prehash: false,\n lowS: false,\n })\n }\n if (publicKey.kty === 'EC' && publicKey.crv === 'P-521' && hashAlg !== 'SHA-512') {\n if (hashAlg !== 'SHA-256' && hashAlg !== 'SHA-384') {\n throw new CredoWebCryptoError(\n `Hash Alg: ${hashAlg} is not supported with key type ${publicKey.crv} currently`\n )\n }\n\n return p521.verify(signature, Hasher.hash(message, hashAlg.toLowerCase()), publicKey.publicKey, {\n prehash: false,\n lowS: false,\n })\n }\n }\n\n const jwaAlgorithm = keyParamsToJwaAlgorithm(algorithm, key)\n const { verified } = await this.kms.verify({\n key: {\n publicJwk: key.publicJwk.toJson(),\n },\n algorithm: jwaAlgorithm,\n signature,\n data: message,\n })\n\n return verified\n }\n\n public async generate(algorithm: KeyGenAlgorithm) {\n const key = await this.kms.createKey({\n type: cryptoKeyAlgorithmToCreateKeyOptions(algorithm),\n })\n\n return key\n }\n\n public async importKey(\n format: KeyFormat,\n keyData: Uint8Array | JsonWebKey,\n algorithm: KeyImportParams,\n extractable: boolean,\n keyUsages: Array<KeyUsage>\n ): Promise<CredoWebCryptoKey> {\n if (format === 'jwk' && keyData instanceof Uint8Array) {\n throw new Error('JWK format is only allowed with a jwk as key data')\n }\n\n if (format !== 'jwk' && !(keyData instanceof Uint8Array)) {\n throw new Error('non-jwk formats are only allowed with a uint8array as key data')\n }\n\n switch (format.toLowerCase()) {\n case 'jwk': {\n const publicJwk = PublicJwk.fromUnknown(keyData)\n return new CredoWebCryptoKey(publicJwk, algorithm as KeyGenAlgorithm, extractable, 'public', keyUsages)\n }\n case 'spki': {\n const subjectPublicKey = AsnParser.parse(keyData as Uint8Array, SubjectPublicKeyInfo)\n const publicJwk = spkiToPublicJwk(subjectPublicKey)\n\n return new CredoWebCryptoKey(publicJwk, algorithm as KeyGenAlgorithm, extractable, 'public', keyUsages)\n }\n default:\n throw new Error(`Unsupported export format: ${format}`)\n }\n }\n\n public async exportKey(format: KeyFormat, key: CredoWebCryptoKey): Promise<Uint8Array | JsonWebKey> {\n switch (format.toLowerCase()) {\n case 'jwk': {\n return key.publicJwk.toJson()\n }\n case 'spki': {\n const publicKeyInfo = publicJwkToSpki(key.publicJwk)\n\n const derEncoded = AsnConvert.serialize(publicKeyInfo)\n return new Uint8Array(derEncoded)\n }\n\n default:\n throw new Error(`Unsupported export format: ${format}`)\n }\n 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