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| 1 | +import { expect } from 'chai'; |
| 2 | +import { test } from '../util'; |
| 3 | +import crypto from 'react-native-quick-crypto'; |
| 4 | +import type { WebCryptoKeyPair } from 'react-native-quick-crypto'; |
| 5 | +import { |
| 6 | + MLKEM_VARIANTS, |
| 7 | + MLKEM_CIPHERTEXT_SIZES, |
| 8 | + SHARED_SECRET_SIZE, |
| 9 | +} from './mlkem_constants'; |
| 10 | + |
| 11 | +const { subtle } = crypto; |
| 12 | + |
| 13 | +const SUITE = 'subtle.encapsulate/decapsulate'; |
| 14 | + |
| 15 | +// --- encapsulateBits / decapsulateBits --- |
| 16 | + |
| 17 | +for (const variant of MLKEM_VARIANTS) { |
| 18 | + test(SUITE, `${variant} encapsulateBits/decapsulateBits`, async () => { |
| 19 | + const keyPair = await subtle.generateKey({ name: variant }, true, [ |
| 20 | + 'encapsulateBits', |
| 21 | + 'decapsulateBits', |
| 22 | + ]); |
| 23 | + |
| 24 | + const { publicKey, privateKey } = keyPair as WebCryptoKeyPair; |
| 25 | + |
| 26 | + const { sharedKey, ciphertext } = await subtle.encapsulateBits( |
| 27 | + { name: variant }, |
| 28 | + publicKey, |
| 29 | + ); |
| 30 | + |
| 31 | + expect(ciphertext.byteLength).to.equal(MLKEM_CIPHERTEXT_SIZES[variant]); |
| 32 | + expect(sharedKey.byteLength).to.equal(SHARED_SECRET_SIZE); |
| 33 | + |
| 34 | + const decapsulated = await subtle.decapsulateBits( |
| 35 | + { name: variant }, |
| 36 | + privateKey, |
| 37 | + ciphertext, |
| 38 | + ); |
| 39 | + |
| 40 | + expect(decapsulated.byteLength).to.equal(SHARED_SECRET_SIZE); |
| 41 | + |
| 42 | + const encapsulatedBytes = new Uint8Array(sharedKey); |
| 43 | + const decapsulatedBytes = new Uint8Array(decapsulated); |
| 44 | + expect(encapsulatedBytes).to.deep.equal(decapsulatedBytes); |
| 45 | + }); |
| 46 | + |
| 47 | + // --- encapsulateKey / decapsulateKey with AES-GCM --- |
| 48 | + |
| 49 | + test(SUITE, `${variant} encapsulateKey/decapsulateKey AES-GCM`, async () => { |
| 50 | + const keyPair = await subtle.generateKey({ name: variant }, true, [ |
| 51 | + 'encapsulateKey', |
| 52 | + 'decapsulateKey', |
| 53 | + ]); |
| 54 | + |
| 55 | + const { publicKey, privateKey } = keyPair as WebCryptoKeyPair; |
| 56 | + |
| 57 | + const { key: aesKey, ciphertext } = await subtle.encapsulateKey( |
| 58 | + { name: variant }, |
| 59 | + publicKey, |
| 60 | + { name: 'AES-GCM', length: 256 }, |
| 61 | + true, |
| 62 | + ['encrypt', 'decrypt'], |
| 63 | + ); |
| 64 | + |
| 65 | + expect(ciphertext.byteLength).to.equal(MLKEM_CIPHERTEXT_SIZES[variant]); |
| 66 | + expect(aesKey.algorithm.name).to.equal('AES-GCM'); |
| 67 | + expect(aesKey.extractable).to.equal(true); |
| 68 | + expect(aesKey.usages).to.include('encrypt'); |
| 69 | + |
| 70 | + const decapsulatedKey = await subtle.decapsulateKey( |
| 71 | + { name: variant }, |
| 72 | + privateKey, |
| 73 | + ciphertext, |
| 74 | + { name: 'AES-GCM', length: 256 }, |
| 75 | + true, |
| 76 | + ['encrypt', 'decrypt'], |
| 77 | + ); |
| 78 | + |
| 79 | + expect(decapsulatedKey.algorithm.name).to.equal('AES-GCM'); |
| 80 | + |
| 81 | + const rawEncapsulated = await subtle.exportKey('raw', aesKey); |
| 82 | + const rawDecapsulated = await subtle.exportKey('raw', decapsulatedKey); |
| 83 | + expect(new Uint8Array(rawEncapsulated as ArrayBuffer)).to.deep.equal( |
| 84 | + new Uint8Array(rawDecapsulated as ArrayBuffer), |
| 85 | + ); |
| 86 | + }); |
| 87 | + |
| 88 | + // --- Import then encapsulate/decapsulate roundtrip --- |
| 89 | + |
| 90 | + test(SUITE, `${variant} import then encap/decap`, async () => { |
| 91 | + const keyPair = await subtle.generateKey({ name: variant }, true, [ |
| 92 | + 'encapsulateBits', |
| 93 | + 'decapsulateBits', |
| 94 | + ]); |
| 95 | + |
| 96 | + const { publicKey, privateKey } = keyPair as WebCryptoKeyPair; |
| 97 | + |
| 98 | + const spki = (await subtle.exportKey('spki', publicKey)) as ArrayBuffer; |
| 99 | + const pkcs8 = (await subtle.exportKey('pkcs8', privateKey)) as ArrayBuffer; |
| 100 | + |
| 101 | + const importedPub = await subtle.importKey( |
| 102 | + 'spki', |
| 103 | + spki, |
| 104 | + { name: variant }, |
| 105 | + true, |
| 106 | + ['encapsulateBits'], |
| 107 | + ); |
| 108 | + const importedPriv = await subtle.importKey( |
| 109 | + 'pkcs8', |
| 110 | + pkcs8, |
| 111 | + { name: variant }, |
| 112 | + true, |
| 113 | + ['decapsulateBits'], |
| 114 | + ); |
| 115 | + |
| 116 | + const { sharedKey, ciphertext } = await subtle.encapsulateBits( |
| 117 | + { name: variant }, |
| 118 | + importedPub, |
| 119 | + ); |
| 120 | + |
| 121 | + const decapsulated = await subtle.decapsulateBits( |
| 122 | + { name: variant }, |
| 123 | + importedPriv, |
| 124 | + ciphertext, |
| 125 | + ); |
| 126 | + |
| 127 | + expect(new Uint8Array(sharedKey)).to.deep.equal( |
| 128 | + new Uint8Array(decapsulated), |
| 129 | + ); |
| 130 | + }); |
| 131 | +} |
| 132 | + |
| 133 | +// --- Top-level crypto.encapsulate/decapsulate --- |
| 134 | + |
| 135 | +for (const variant of MLKEM_VARIANTS) { |
| 136 | + test(SUITE, `${variant} crypto.encapsulate/decapsulate`, async () => { |
| 137 | + const keyPair = await subtle.generateKey({ name: variant }, true, [ |
| 138 | + 'encapsulateBits', |
| 139 | + 'decapsulateBits', |
| 140 | + ]); |
| 141 | + |
| 142 | + const { publicKey, privateKey } = keyPair as WebCryptoKeyPair; |
| 143 | + |
| 144 | + const result = crypto.encapsulate(publicKey); |
| 145 | + expect(result).to.have.property('sharedKey'); |
| 146 | + expect(result).to.have.property('ciphertext'); |
| 147 | + |
| 148 | + const { sharedKey, ciphertext } = result!; |
| 149 | + expect(ciphertext.byteLength).to.equal(MLKEM_CIPHERTEXT_SIZES[variant]); |
| 150 | + expect(sharedKey.byteLength).to.equal(SHARED_SECRET_SIZE); |
| 151 | + |
| 152 | + const decapsulated = crypto.decapsulate(privateKey, ciphertext); |
| 153 | + expect(decapsulated).to.be.an.instanceOf(ArrayBuffer); |
| 154 | + expect((decapsulated as ArrayBuffer).byteLength).to.equal( |
| 155 | + SHARED_SECRET_SIZE, |
| 156 | + ); |
| 157 | + |
| 158 | + expect(new Uint8Array(sharedKey)).to.deep.equal( |
| 159 | + new Uint8Array(decapsulated as ArrayBuffer), |
| 160 | + ); |
| 161 | + }); |
| 162 | +} |
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