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extract public from private key
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@ -161,6 +161,15 @@ describe('NodeCrypto Function Service', () => {
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});
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});
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describe('rsaExtractPublicKey', () => {
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it('should successfully extract key', async () => {
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const nodeCryptoFunctionService = new NodeCryptoFunctionService();
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const privKey = Utils.fromB64ToArray(RsaPrivateKey);
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const publicKey = await nodeCryptoFunctionService.rsaExtractPublicKey(privKey.buffer);
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expect(Utils.fromBufferToB64(publicKey)).toBe(RsaPublicKey);
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});
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});
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describe('randomBytes', () => {
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it('should make a value of the correct length', async () => {
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const nodeCryptoFunctionService = new NodeCryptoFunctionService();
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@ -247,6 +247,15 @@ describe('WebCrypto Function Service', () => {
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});
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});
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describe('rsaExtractPublicKey', () => {
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it('should successfully extract key', async () => {
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const cryptoFunctionService = getWebCryptoFunctionService();
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const privKey = Utils.fromB64ToArray(RsaPrivateKey);
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const publicKey = await cryptoFunctionService.rsaExtractPublicKey(privKey.buffer);
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expect(Utils.fromBufferToB64(publicKey)).toBe(RsaPublicKey);
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});
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});
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describe('randomBytes', () => {
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it('should make a value of the correct length', async () => {
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const cryptoFunctionService = getWebCryptoFunctionService();
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@ -16,6 +16,7 @@ export abstract class CryptoFunctionService {
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aesDecryptFast: (parameters: DecryptParameters<ArrayBuffer | string>) => Promise<string>;
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aesDecrypt: (data: ArrayBuffer, iv: ArrayBuffer, key: ArrayBuffer) => Promise<ArrayBuffer>;
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rsaEncrypt: (data: ArrayBuffer, publicKey: ArrayBuffer, algorithm: 'sha1' | 'sha256') => Promise<ArrayBuffer>;
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rsaDecrypt: (data: ArrayBuffer, key: ArrayBuffer, algorithm: 'sha1' | 'sha256') => Promise<ArrayBuffer>;
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rsaDecrypt: (data: ArrayBuffer, privateKey: ArrayBuffer, algorithm: 'sha1' | 'sha256') => Promise<ArrayBuffer>;
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rsaExtractPublicKey: (privateKey: ArrayBuffer) => Promise<ArrayBuffer>;
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randomBytes: (length: number) => Promise<ArrayBuffer>;
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}
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@ -133,6 +133,16 @@ export class NodeCryptoFunctionService implements CryptoFunctionService {
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return Promise.resolve(this.toArrayBuffer(decipher));
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}
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async rsaExtractPublicKey(privateKey: ArrayBuffer): Promise<ArrayBuffer> {
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const privateKeyByteString = Utils.fromBufferToByteString(privateKey);
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const privateKeyAsn1 = forge.asn1.fromDer(privateKeyByteString);
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const forgePrivateKey = (forge as any).pki.privateKeyFromAsn1(privateKeyAsn1);
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const forgePublicKey = (forge.pki as any).setRsaPublicKey(forgePrivateKey.n, forgePrivateKey.e);
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const publicKeyAsn1 = (forge.pki as any).publicKeyToAsn1(forgePublicKey);
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const publicKeyByteString = forge.asn1.toDer(publicKeyAsn1).data;
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return Utils.fromByteStringToArray(publicKeyByteString).buffer;
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}
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randomBytes(length: number): Promise<ArrayBuffer> {
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return new Promise<ArrayBuffer>((resolve, reject) => {
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crypto.randomBytes(length, (error, bytes) => {
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@ -204,6 +204,25 @@ export class WebCryptoFunctionService implements CryptoFunctionService {
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return await this.subtle.decrypt(rsaParams, impKey, data);
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}
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async rsaExtractPublicKey(privateKey: ArrayBuffer): Promise<ArrayBuffer> {
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const rsaParams = {
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name: 'RSA-OAEP',
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// Have to specify some algorithm
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hash: { name: this.toWebCryptoAlgorithm('sha1') },
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};
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const impPrivateKey = await this.subtle.importKey('pkcs8', privateKey, rsaParams, true, ['decrypt']);
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const jwkPrivateKey = await this.subtle.exportKey('jwk', impPrivateKey);
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const jwkPublicKeyParams = {
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kty: 'RSA',
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e: jwkPrivateKey.e,
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n: jwkPrivateKey.n,
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alg: 'RSA-OAEP',
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ext: true,
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};
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const impPublicKey = await this.subtle.importKey('jwk', jwkPublicKeyParams, rsaParams, true, ['encrypt']);
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return await this.subtle.exportKey('spki', impPublicKey);
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}
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randomBytes(length: number): Promise<ArrayBuffer> {
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const arr = new Uint8Array(length);
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this.crypto.getRandomValues(arr);
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