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kyber.go
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kyber.go
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package cryptoutil
import (
"crypto/rand"
"github.com/Yawning/kyber"
"github.com/pkg/errors"
)
func kyberGenKey(keyType KeyType) (pvt []byte, pub []byte, err error) {
var parameterSet *kyber.ParameterSet
if keyType == KeyTypeKyber512 {
parameterSet = kyber.Kyber512
} else if keyType == KeyTypeKyber768 {
parameterSet = kyber.Kyber768
} else if keyType == KeyTypeKyber1024 {
parameterSet = kyber.Kyber1024
} else {
err = errors.Errorf("I do not know how to create a key type %d.", keyType)
return
}
kPub, kPvt, err := parameterSet.GenerateKeyPair(rand.Reader)
if err != nil {
return
}
pub = kPub.Bytes()
pvt = kPvt.Bytes()
return
}
func kyberParameters(keyType KeyType) (params *kyber.ParameterSet, err error) {
switch keyType {
case KeyTypeKyber512:
params = kyber.Kyber512
case KeyTypeKyber768:
params = kyber.Kyber768
case KeyTypeKyber1024:
params = kyber.Kyber1024
default:
err = errors.Errorf("I don't know how to create a Kyber keyType %v", keyType)
}
return
}
func kyberEncapsulate(pub []byte, keyType KeyType) (ct []byte, ss []byte, err error) {
kyberParams, err := kyberParameters(keyType)
if err != nil {
return
}
kPub, err := kyberParams.PublicKeyFromBytes(pub)
if err != nil {
return
}
ct, ss, err = kPub.KEMEncrypt(rand.Reader)
return
}
func kyberDencapsulate(pvt []byte, ct []byte, keyType KeyType) (ss []byte, err error) {
kyberParms, err := kyberParameters(keyType)
if err != nil {
return
}
kPvt, err := kyberParms.PrivateKeyFromBytes(pvt)
if err != nil {
return
}
ss = kPvt.KEMDecrypt(ct)
return
}