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50 lines
1.1 KiB
50 lines
1.1 KiB
// +build js
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package rand
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import (
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"errors"
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"github.com/gopherjs/gopherjs/js"
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)
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func init() {
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Reader = &rngReader{}
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}
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type rngReader struct{}
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func (r *rngReader) Read(b []byte) (n int, err error) {
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array := js.InternalObject(b).Get("$array")
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offset := js.InternalObject(b).Get("$offset").Int()
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// browser
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crypto := js.Global.Get("crypto")
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if crypto == js.Undefined {
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crypto = js.Global.Get("msCrypto")
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}
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if crypto != js.Undefined {
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if crypto.Get("getRandomValues") != js.Undefined {
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n = len(b)
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if n > 65536 {
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// Avoid QuotaExceededError thrown by getRandomValues
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// when length is more than 65536, as specified in
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// http://www.w3.org/TR/WebCryptoAPI/#Crypto-method-getRandomValues
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n = 65536
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}
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crypto.Call("getRandomValues", array.Call("subarray", offset, offset+n))
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return n, nil
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}
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}
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// Node.js
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if require := js.Global.Get("require"); require != js.Undefined {
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if randomBytes := require.Invoke("crypto").Get("randomBytes"); randomBytes != js.Undefined {
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array.Call("set", randomBytes.Invoke(len(b)), offset)
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return len(b), nil
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}
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}
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return 0, errors.New("crypto/rand not available in this environment")
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}
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