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ecies: Append hash.Sum to k directly

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Luke Champine 2020-03-31 16:13:16 -04:00 committed by GitHub
parent 830d1382f1
commit c863c9749e
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 5 additions and 7 deletions
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12
crypto/ecies/ecies.go
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@ -145,17 +145,15 @@ var (
// NIST SP 800-56 Concatenation Key Derivation Function (see section 5.8.1).
func concatKDF(hash hash.Hash, z, s1 []byte, kdLen int) []byte {
counter := []byte{0, 0, 0, 1}
counterBytes := make([]byte, 4)
k := make([]byte, 0, kdLen+hash.Size())
for len(k) < kdLen {
for counter := uint32(1); len(k) < kdLen; counter++ {
hash.Reset()
hash.Write(counter)
binary.BigEndian.PutUint32(counterBytes, counter)
hash.Write(counterBytes)
hash.Write(z)
hash.Write(s1)
k = k[:len(k)+hash.Size()]
hash.Sum(k[:len(k)-hash.Size()])
// increment counter
binary.BigEndian.PutUint32(counter, binary.BigEndian.Uint32(counter)+1)
k = hash.Sum(k)
}
return k[:kdLen]
}