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Crypto: Difference between revisions

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m (even more like a proper spec)
(Throw an exception for overlarge arrays, as discussed in https://bugzilla.mozilla.org/show_bug.cgi?id=440046)
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The <b id=dom-Crypto-getRandomValues title=dom-Crypto-getRandomValues><code>getRandomValues(<var>array</var>)</code></b> must run the following steps:
The <b id=dom-Crypto-getRandomValues title=dom-Crypto-getRandomValues><code>getRandomValues(<var>array</var>)</code></b> must run the following steps:
# <var>array</var> is an [http://www.khronos.org/registry/typedarray/specs/latest/#6 ArrayBufferView]. If <var>array</var> is not of an integer type (i.e., Int8Array, Uint8Array, Int16Array, Uint16Array, Int32Array, or Uint32Array), throw a [http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#dom-domexception-type_mismatch_err TYPE_MISMATCH_ERR] and abort these steps.
# <var>array</var> is an [http://www.khronos.org/registry/typedarray/specs/latest/#6 ArrayBufferView]. If <var>array</var> is not of an integer type (i.e., Int8Array, Uint8Array, Int16Array, Uint16Array, Int32Array, or Uint32Array), [http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#concept-throw throw] a [http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#typemismatcherror TypeMismatchError] and abort these steps.
# If <var>array</var>'s length is greater than 65536, [http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#concept-throw throw] a [http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#quotaexceedederror QuotaExceededError] and abort these steps.
# Overwrite all elements of <var>array</var> with [[#concept-cryptographically-random-values|cryptographically random values]] of the appropriate type.
# Overwrite all elements of <var>array</var> with [[#concept-cryptographically-random-values|cryptographically random values]] of the appropriate type.


[[Category:Proposals]]
[[Category:Proposals]]

Revision as of 19:52, 12 October 2011

Overview

This document describes a proposal for the window.crypto API.

Definitions

Cryptographically Random Values

A cryptographically random value is a value generated from a cryptographically strong pseudo-random number generator seeded with truly random values. In practice, implementations should generate cryptographically random values using well-established cryptographic pseudo-random number generators, such as RC4, seeded with high-quality entropy, such as from an operating-system entropy source (e.g., /dev/urandom). This document provides no lower-bound on the information theoretic entropy present in cryptographically random values, but implementations should make a best effort to provide as much entropy as practicable.

Interface Crypto

interface Crypto {
  void getRandomValues(in ArrayBufferView array);
};

partial interface Window {
  readonly attribute Crypto crypto;
};

The getRandomValues(array) must run the following steps:

  1. array is an ArrayBufferView. If array is not of an integer type (i.e., Int8Array, Uint8Array, Int16Array, Uint16Array, Int32Array, or Uint32Array), throw a TypeMismatchError and abort these steps.
  2. If array's length is greater than 65536, throw a QuotaExceededError and abort these steps.
  3. Overwrite all elements of array with cryptographically random values of the appropriate type.