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util.go
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/
util.go
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package trie
import (
"fmt"
"go.dedis.ch/kyber/v3"
"golang.org/x/crypto/blake2b"
)
func commonPrefix(b1, b2 []byte) []byte {
ret := make([]byte, 0)
for i := 0; i < len(b1) && i < len(b2); i++ {
if b1[i] != b2[i] {
break
}
ret = append(ret, b1[i])
}
return ret
}
func scalarFromBytes(ret kyber.Scalar, data []byte) kyber.Scalar {
h := blake2b.Sum256(data)
ret.SetBytes(h[:])
return ret
}
// scalarFromPoint hashes the point and make a scalar from hash
// Note that zero point does not result in zero scalar
func scalarFromPoint(ret kyber.Scalar, point kyber.Point) kyber.Scalar {
if point == nil {
ret.Zero()
return ret
}
pBin, err := point.MarshalBinary()
if err != nil {
panic(err)
}
scalarFromBytes(ret, pBin)
return ret
}
func assert(cond bool, msg interface{}) {
if !cond {
panic(fmt.Sprintf("failed assertion: '%v'", msg))
}
}