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Crypto: Difference between revisions
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BrendanEich (talk | contribs) m (fix typo) |
(Make this read like a spec, update to modern IDL syntax, and fix header levels) |
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=Overview= | ==Overview== | ||
This document describes a proposal for the window.crypto API. | This document describes a proposal for the window.crypto API. | ||
=Definitions= | ==Definitions== | ||
==Cryptographically Random Values== | ===Cryptographically Random Values=== | ||
A | A <b id=concept-cryptographically-random-values title=concept-cryptographically-random-values>cryptographically random value</b> 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= | ==Interface== | ||
<pre> | <pre> | ||
interface Crypto { | interface Crypto { | ||
void getRandomValues(in ArrayBufferView array); | void getRandomValues(in ArrayBufferView array); | ||
}; | }; | ||
partial interface Window { | |||
interface Window { | |||
readonly attribute Crypto crypto; | readonly attribute Crypto crypto; | ||
}; | }; | ||
</pre> | </pre> | ||
=Methods= | ==Methods== | ||
==getRandomValues== | ===getRandomValues=== | ||
The | 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. | |||
# 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 12:14, 18 August 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
interface Crypto {
void getRandomValues(in ArrayBufferView array);
};
partial interface Window {
readonly attribute Crypto crypto;
};
Methods
getRandomValues
The getRandomValues(array) must run the following steps:
- array is an ArrayBufferView. If array is not of an integer type (i.e., Int8Array, Uint8Array, Int16Array, Uint16Array, Int32Array, or Uint32Array), throw a TYPE_MISMATCH_ERR and abort these steps.
- Overwrite all elements of array with cryptographically random values of the appropriate type.