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Add info to readme

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Kagami Hiiragi 2015-01-18 00:26:19 +03:00
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@ -19,11 +19,11 @@ With the help of browserify `eccrypto` provides different implementations for Br
#### crypto
ECDH only works in Node 0.11+ (see https://github.com/joyent/node/pull/5854), ECDSA is only supported when keys are in PEM format (see https://github.com/joyent/node/issues/6904) and ECIES is not supported at all.
ECDH only works in Node 0.11+ (see https://github.com/joyent/node/pull/5854), ECDSA only supports keys in PEM format (see https://github.com/joyent/node/issues/6904) and ECIES is not supported at all.
#### WebCryptoAPI
ECDSA and ECDH are supported in Chrome [only on Windows](https://sites.google.com/a/chromium.org/dev/blink/webcrypto#TOC-Supported-algorithms-as-of-Chrome-41-) (see also [bug 338883](https://code.google.com/p/chromium/issues/detail?id=338883)), aren't supported by Firefox (fixed only in 36.0+, see [bug 1034854](https://bugzilla.mozilla.org/show_bug.cgi?id=1034854)) and ECIES is not defined at all in WebCryptoAPI draft. Also WebCryptoAPI [currently defines](http://www.w3.org/TR/WebCryptoAPI/#EcKeyGenParams-dictionary) only curves recommended by NIST which means that secp256k1 is not supported (see also: [[1]](http://lists.w3.org/Archives/Public/public-webcrypto-comments/2013Dec/0001.html), [[2]](https://bugzilla.mozilla.org/show_bug.cgi?id=1051509)).
ECDSA and ECDH are supported in Chrome [only on Windows](https://sites.google.com/a/chromium.org/dev/blink/webcrypto#TOC-Supported-algorithms-as-of-Chrome-41-) (see also [bug 338883](https://code.google.com/p/chromium/issues/detail?id=338883)), aren't supported by Firefox (fixed only in 36.0+, see [bug 1034854](https://bugzilla.mozilla.org/show_bug.cgi?id=1034854); see also [feature matrix](https://docs.google.com/spreadsheet/ccc?key=0AiAcidBZRLxndE9LWEs2R1oxZ0xidUVoU3FQbFFobkE#gid=1)) and ECIES is not defined at all in WebCryptoAPI draft. Also WebCryptoAPI [currently defines](http://www.w3.org/TR/WebCryptoAPI/#EcKeyGenParams-dictionary) only curves recommended by NIST meaning that secp256k1 (K-256) curve is not supported (see also: [[1]](http://lists.w3.org/Archives/Public/public-webcrypto-comments/2013Dec/0001.html), [[2]](https://bugzilla.mozilla.org/show_bug.cgi?id=1051509)).
So we use [seck256k1](https://www.npmjs.com/package/secp256k1) library in Node for ECDSA, [elliptic](https://www.npmjs.com/package/elliptic) in Browser for ECDSA and ECDH and implement ECIES manually with the help of native crypto API.