From 55c491f8ea8bb0ba8cb1b856b3c42dd05c31565d Mon Sep 17 00:00:00 2001
From: Leonid Logvinov <logvinov.leon@gmail.com>
Date: Thu, 25 May 2017 11:19:14 +0200
Subject: Add generateSalt and tests for it

---
 src/ts/0x.js.ts | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'src/ts/0x.js.ts')

diff --git a/src/ts/0x.js.ts b/src/ts/0x.js.ts
index acbdd01e2..14f9f2061 100644
--- a/src/ts/0x.js.ts
+++ b/src/ts/0x.js.ts
@@ -11,6 +11,8 @@ export interface ECSignature {
     s: string;
 }
 
+const MAX_DIGITS_IN_UNSIGNED_256_INT = 78;
+
 export class ZeroEx {
     /**
      * Verifies that the elliptic curve signature `signature` was generated
@@ -34,4 +36,13 @@ export class ZeroEx {
             return false;
         }
     }
+    /** Generates pseudo-random 256 bits salt */
+    public static generatePseudoRandomSalt(): BigNumber.BigNumber {
+        // BigNumber.random returns a pseudo-random number between 0 & 1 with a passed in number of decimal places.
+        // Source: https://mikemcl.github.io/bignumber.js/#random
+        const randomNumber = BigNumber.random(MAX_DIGITS_IN_UNSIGNED_256_INT);
+        const factor = new BigNumber(10).pow(MAX_DIGITS_IN_UNSIGNED_256_INT - 1);
+        const salt = randomNumber.times(factor).round();
+        return salt;
+    }
 }
-- 
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