Add type guards to function. Spaces.

diff --git a/src/lib/blake2b.ts b/src/lib/blake2b.ts
index 41237d69ed2c1550dedaac20affe6e940d096486..3f040ec0829eba826a955f734e36b73d05719025 100644 (file)
--- a/src/lib/blake2b.ts
+++ b/src/lib/blake2b.ts
@@ -283,9 +283,12 @@ function hexSlice (buf: Uint8Array) {
        return str
 }
 
-function toHex (n) {
-       if (n < 16) return '0' + n.toString(16)
-       return n.toString(16)
+function toHex (n: number) {
+       if (typeof n !== 'number')
+                throw new TypeError(`expected number to convert to hex, received convert ${typeof n}`)
+       if (n < 0 || n > 255)
+               throw new RangeError(`expected byte value 0-255, received ${n}`)
+       return n.toString(16).padStart(2, '0')
 }
 
 var Proto = Blake2b
@@ -305,15 +308,15 @@ export default function createHash (outlen: number, key?: Uint8Array, salt?: Uin
                                throw new RangeError('key must be at most ' + KEYBYTES_MAX + ', was given ' + key.length)
                }
                if (salt != null) {
-                       if(!(salt instanceof Uint8Array))
+                       if (!(salt instanceof Uint8Array))
                                throw new TypeError('salt must be Uint8Array or Buffer')
                        if (salt.length !== SALTBYTES)
                                throw new RangeError('salt must be exactly ' + SALTBYTES + ', was given ' + salt.length)
                }
                if (personal != null) {
-                       if(!(personal instanceof Uint8Array))
-                               throw new TypeError( 'personal must be Uint8Array or Buffer')
-                       if(personal.length !== PERSONALBYTES)
+                       if (!(personal instanceof Uint8Array))
+                               throw new TypeError('personal must be Uint8Array or Buffer')
+                       if (personal.length !== PERSONALBYTES)
                                throw new RangeError('personal must be exactly ' + PERSONALBYTES + ', was given ' + personal.length)
                }
        }