Add types for diffie-hellman

types/diffie-hellman/diffie-hellman-tests.ts

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+import * as dh from 'diffie-hellman';
+
+const dh1 = dh.getDiffieHellman('modp1');
+// $ExpectType DiffieHellman
+dh1;
+// $ExpectType Buffer
+dh1.generateKeys();
+// $ExpectType string
+dh1.generateKeys('hex');
+// $ExpectType Buffer
+dh1.getPrime();
+// $ExpectType string
+dh1.getPrime('hex');
+// $ExpectType Buffer
+dh1.getGenerator();
+// $ExpectType string
+dh1.getGenerator('hex');
+const pk = dh1.getPublicKey();
+// $ExpectType Buffer
+pk;
+// $ExpectType string
+dh1.getPublicKey('hex');
+// $ExpectType Buffer
+dh1.getPrivateKey();
+// $ExpectType string
+dh1.getPrivateKey('hex');
+// $ExpectType Buffer
+dh1.computeSecret(pk);
+// $ExpectType Buffer
+dh1.computeSecret(pk.toString('hex'), 'hex');
+// $ExpectType string
+dh1.computeSecret(pk.toString('hex'), 'hex', 'hex');
+
+const dh2 = dh.createDiffieHellman(new Buffer([5]));
+// $ExpectType DiffieHellman
+dh2;
+dh.createDiffieHellman('prime', 'hex');
+dh.createDiffieHellman('prime', 'hex', new Buffer([5]));
+dh.createDiffieHellman('prime', 'hex', 5);
+dh.createDiffieHellman('prime', 'hex', 'generator', 'hex');
+dh.createDiffieHellman(1);
+dh.createDiffieHellman(1, 1);
+dh.createDiffieHellman(1, new Buffer([5]));
+
+dh2.setPublicKey(pk);
+dh2.setPublicKey(pk.toString('hex'), 'hex');
+dh2.setPrivateKey(pk);
+dh2.setPrivateKey(pk.toString('hex'), 'hex');

types/diffie-hellman/index.d.ts

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+// Type definitions for diffie-hellman 5.0
+// Project: https://github.com/crypto-browserify/diffie-hellman
+// Definitions by: BendingBender <https://github.com/BendingBender>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+/// <reference types="node" />
+
+export { createDiffieHellman, getDiffieHellman, DiffieHellman } from 'crypto';

types/diffie-hellman/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "strictFunctionTypes": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "diffie-hellman-tests.ts"
+    ]
+}

types/diffie-hellman/tslint.json

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+{ "extends": "dtslint/dt.json" }