crypto: remove Hmac* exposure in API

src/crypto.js

@@ -20,23 +20,10 @@ function sha256 (buffer) {
   return crypto.createHash('sha256').update(buffer).digest()
 }
 
-// FIXME: Name not consistent with others
-function HmacSHA256 (buffer, secret) {
-  console.warn('Hmac* functions are deprecated for removal in 2.0.0, use node crypto instead')
-  return crypto.createHmac('sha256', secret).update(buffer).digest()
-}
-
-function HmacSHA512 (buffer, secret) {
-  console.warn('Hmac* functions are deprecated for removal in 2.0.0, use node crypto instead')
-  return crypto.createHmac('sha512', secret).update(buffer).digest()
-}
-
 module.exports = {
-  ripemd160: ripemd160,
-  sha1: sha1,
-  sha256: sha256,
   hash160: hash160,
   hash256: hash256,
-  HmacSHA256: HmacSHA256,
-  HmacSHA512: HmacSHA512
+  ripemd160: ripemd160,
+  sha1: sha1,
+  sha256: sha256
 }