36 lines
692 B
Go
36 lines
692 B
Go
package randentropy
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import (
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crand "crypto/rand"
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"github.com/ethereum/go-ethereum/crypto/sha3"
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"io"
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)
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var Reader io.Reader = &randEntropy{}
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type randEntropy struct {
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}
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func (*randEntropy) Read(bytes []byte) (n int, err error) {
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readBytes := GetEntropyCSPRNG(len(bytes))
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copy(bytes, readBytes)
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return len(bytes), nil
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}
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// TODO: copied from crypto.go , move to sha3 package?
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func Sha3(data []byte) []byte {
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d := sha3.NewKeccak256()
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d.Write(data)
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return d.Sum(nil)
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}
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func GetEntropyCSPRNG(n int) []byte {
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mainBuff := make([]byte, n)
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_, err := io.ReadFull(crand.Reader, mainBuff)
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if err != nil {
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panic("reading from crypto/rand failed: " + err.Error())
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}
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return mainBuff
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}
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