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September 21, 2024 16:54
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node-seal example
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| // https://github.com/s0l0ist/node-seal/blob/main/FULL-EXAMPLE.md | |
| // https://github.com/s0l0ist/node-seal/blob/main/USAGE.md | |
| // See also https://inferati.com/blog/fhe-schemes-bfv | |
| ;(async () => { | |
| const SEAL = require('node-seal') | |
| const seal = await SEAL() | |
| const schemeType = seal.SchemeType.bgv | |
| const securityLevel = seal.SecurityLevel.tc128 | |
| const polyModulusDegree = 4096 | |
| // Bit sizes for each prime of the coeffModulus | |
| const bitSizes = [36, 36, 37] | |
| // Bit size representing plainModulus | |
| const bitSize = 20 | |
| const parms = seal.EncryptionParameters(schemeType) | |
| // Set the PolyModulusDegree | |
| parms.setPolyModulusDegree(polyModulusDegree) | |
| // Create a suitable set of CoeffModulus primes | |
| parms.setCoeffModulus( | |
| seal.CoeffModulus.Create(polyModulusDegree, Int32Array.from(bitSizes)) | |
| ) | |
| // Set the PlainModulus to a prime of bitSize 20. | |
| // i.e. plaintext modulus, of bit size 20 (i.e < 1,048,576) | |
| parms.setPlainModulus( | |
| seal.PlainModulus.Batching(polyModulusDegree, bitSize) | |
| ) | |
| console.log(parms.plainModulus.value) | |
| console.log(parms.coeffModulus) | |
| const context = seal.Context( | |
| parms, // Encryption Parameters | |
| true, // ExpandModChain | |
| securityLevel // Enforce a security level | |
| ) | |
| if (!context.parametersSet()) { | |
| throw new Error( | |
| 'Could not set the parameters in the given context. Please try different encryption parameters.' | |
| ) | |
| } | |
| const encoder = seal.BatchEncoder(context) | |
| const keyGenerator = seal.KeyGenerator(context) | |
| const publicKey = keyGenerator.createPublicKey() | |
| const secretKey = keyGenerator.secretKey() | |
| const encryptor = seal.Encryptor(context, publicKey) | |
| const decryptor = seal.Decryptor(context, secretKey) | |
| const evaluator = seal.Evaluator(context) | |
| var in1 = "2,5,3,4,5" | |
| var in2 = "3,5,9,11,2" | |
| const array1 = Int32Array.from(in1.split(',')) | |
| const array2 = Int32Array.from(in2.split(',')) | |
| const plainText1 = encoder.encode(array1) | |
| const plainText2 = encoder.encode(array2) | |
| var cipherText1 = encryptor.encrypt(plainText1) | |
| var cipherText2 = encryptor.encrypt(plainText2) | |
| console.log('Plaintext 1:', array1) | |
| console.log('Plaintext 2:', array2) | |
| evaluator.add(cipherText1, cipherText2, cipherText1) | |
| var decryptedPlainText = decryptor.decrypt(cipherText1) | |
| var decodedArray = encoder.decode(decryptedPlainText) | |
| console.log('Decrypted (Homomorphic Add): ', decodedArray) | |
| cipherText1 = encryptor.encrypt(plainText1) | |
| cipherText2 = encryptor.encrypt(plainText2) | |
| evaluator.sub(cipherText1, cipherText2, cipherText1) | |
| decryptedPlainText = decryptor.decrypt(cipherText1) | |
| decodedArray = encoder.decode(decryptedPlainText) | |
| console.log('Decrypted (Homomorphic Subtract): ', decodedArray) | |
| cipherText1 = encryptor.encrypt(plainText1) | |
| cipherText2 = encryptor.encrypt(plainText2) | |
| evaluator.multiply(cipherText1, cipherText2, cipherText1) | |
| decryptedPlainText = decryptor.decrypt(cipherText1) | |
| decodedArray = encoder.decode(decryptedPlainText) | |
| console.log('Decrypted (Homomorphic Multiplication): ', decodedArray) | |
| })() |
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