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use crypto/rand in key spots (for KEM seeds) rather than math/rand

This commit is contained in:
Russ Magee 2021-01-12 23:45:58 -08:00
parent 4e8e064c74
commit 287f9d1035
3 changed files with 11 additions and 33 deletions
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0
LICENSE.mit → LICENSE
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2
Makefile
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@ -1,4 +1,4 @@
VERSION := 0.9.0 VERSION := 0.9.1
.PHONY: lint vis clean common client server passwd subpkgs install uninstall reinstall .PHONY: lint vis clean common client server passwd subpkgs install uninstall reinstall
## Tag version of binaries with build info wrt. ## Tag version of binaries with build info wrt.

42
xsnet/net.go
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@ -39,6 +39,7 @@ import (
"strings" "strings"
"sync" "sync"
"time" "time"
crand "crypto/rand"
hkex "blitter.com/go/herradurakex" hkex "blitter.com/go/herradurakex"
"blitter.com/go/kyber" "blitter.com/go/kyber"
@ -474,24 +475,11 @@ func FrodoKEMDialSetup(c io.ReadWriter, hc *Conn) (err error) {
return return
} }
// randReader wraps rand.Read() in a struct that implements io.Reader
// for use by the Kyber and NEWHOPE/NEWHOPE_SIMPLE KEM methods.
type randReader struct {
}
func (r randReader) Read(b []byte) (n int, e error) {
n, e = rand.Read(b)
return
}
func NewHopeDialSetup(c io.ReadWriter, hc *Conn) (err error) { func NewHopeDialSetup(c io.ReadWriter, hc *Conn) (err error) {
// Send xsnet.Conn parameters to remote side // Send xsnet.Conn parameters to remote side
// Alice, step 1: Generate a key pair. // Alice, step 1: Generate a key pair.
r := new(randReader) privKeyAlice, pubKeyAlice, err := newhope.GenerateKeyPairAlice(crand.Reader)
rand.Seed(time.Now().UnixNano())
privKeyAlice, pubKeyAlice, err := newhope.GenerateKeyPairAlice(r)
if err != nil { if err != nil {
panic(err) panic(err)
} }
@ -533,9 +521,7 @@ func NewHopeSimpleDialSetup(c io.ReadWriter, hc *Conn) (err error) {
// Send xsnet.Conn parameters to remote side // Send xsnet.Conn parameters to remote side
// Alice, step 1: Generate a key pair. // Alice, step 1: Generate a key pair.
r := new(randReader) privKeyAlice, pubKeyAlice, err := newhope.GenerateKeyPairSimpleAlice(crand.Reader)
rand.Seed(time.Now().UnixNano())
privKeyAlice, pubKeyAlice, err := newhope.GenerateKeyPairSimpleAlice(r)
if err != nil { if err != nil {
panic(err) panic(err)
} }
@ -577,19 +563,17 @@ func KyberDialSetup(c io.ReadWriter /*net.Conn*/, hc *Conn) (err error) {
// Send xsnet.Conn parameters to remote side // Send xsnet.Conn parameters to remote side
// Alice, step 1: Generate a key pair. // Alice, step 1: Generate a key pair.
r := new(randReader)
rand.Seed(time.Now().UnixNano())
var alicePublicKey *kyber.PublicKey var alicePublicKey *kyber.PublicKey
var alicePrivateKey *kyber.PrivateKey var alicePrivateKey *kyber.PrivateKey
switch hc.kex { switch hc.kex {
case KEX_KYBER512: case KEX_KYBER512:
alicePublicKey, alicePrivateKey, err = kyber.Kyber512.GenerateKeyPair(r) alicePublicKey, alicePrivateKey, err = kyber.Kyber512.GenerateKeyPair(crand.Reader)
case KEX_KYBER768: case KEX_KYBER768:
alicePublicKey, alicePrivateKey, err = kyber.Kyber768.GenerateKeyPair(r) alicePublicKey, alicePrivateKey, err = kyber.Kyber768.GenerateKeyPair(crand.Reader)
case KEX_KYBER1024: case KEX_KYBER1024:
alicePublicKey, alicePrivateKey, err = kyber.Kyber1024.GenerateKeyPair(r) alicePublicKey, alicePrivateKey, err = kyber.Kyber1024.GenerateKeyPair(crand.Reader)
default: default:
alicePublicKey, alicePrivateKey, err = kyber.Kyber768.GenerateKeyPair(r) alicePublicKey, alicePrivateKey, err = kyber.Kyber768.GenerateKeyPair(crand.Reader)
} }
if err != nil { if err != nil {
@ -731,8 +715,6 @@ func FrodoKEMAcceptSetup(c *net.Conn, hc *Conn) (err error) {
} }
func NewHopeAcceptSetup(c *net.Conn, hc *Conn) (err error) { func NewHopeAcceptSetup(c *net.Conn, hc *Conn) (err error) {
r := new(randReader)
rand.Seed(time.Now().UnixNano())
// Bob, step 1: Deserialize Alice's public key from the binary encoding. // Bob, step 1: Deserialize Alice's public key from the binary encoding.
alicePublicKey := big.NewInt(0) alicePublicKey := big.NewInt(0)
_, err = fmt.Fscanln(*c, alicePublicKey) _, err = fmt.Fscanln(*c, alicePublicKey)
@ -754,7 +736,7 @@ func NewHopeAcceptSetup(c *net.Conn, hc *Conn) (err error) {
} }
// Bob, step 2: Generate the KEM cipher text and shared secret. // Bob, step 2: Generate the KEM cipher text and shared secret.
pubKeyBob, bobSharedSecret, err := newhope.KeyExchangeBob(r, &pubKeyAlice) pubKeyBob, bobSharedSecret, err := newhope.KeyExchangeBob(crand.Reader, &pubKeyAlice)
if err != nil { if err != nil {
panic(err) panic(err)
} }
@ -769,8 +751,6 @@ func NewHopeAcceptSetup(c *net.Conn, hc *Conn) (err error) {
} }
func NewHopeSimpleAcceptSetup(c *net.Conn, hc *Conn) (err error) { func NewHopeSimpleAcceptSetup(c *net.Conn, hc *Conn) (err error) {
r := new(randReader)
rand.Seed(time.Now().UnixNano())
// Bob, step 1: Deserialize Alice's public key from the binary encoding. // Bob, step 1: Deserialize Alice's public key from the binary encoding.
alicePublicKey := big.NewInt(0) alicePublicKey := big.NewInt(0)
_, err = fmt.Fscanln(*c, alicePublicKey) _, err = fmt.Fscanln(*c, alicePublicKey)
@ -792,7 +772,7 @@ func NewHopeSimpleAcceptSetup(c *net.Conn, hc *Conn) (err error) {
} }
// Bob, step 2: Generate the KEM cipher text and shared secret. // Bob, step 2: Generate the KEM cipher text and shared secret.
pubKeyBob, bobSharedSecret, err := newhope.KeyExchangeSimpleBob(r, &pubKeyAlice) pubKeyBob, bobSharedSecret, err := newhope.KeyExchangeSimpleBob(crand.Reader, &pubKeyAlice)
if err != nil { if err != nil {
panic(err) panic(err)
} }
@ -838,9 +818,7 @@ func KyberAcceptSetup(c *net.Conn, hc *Conn) (err error) {
} }
// Bob, step 2: Generate the KEM cipher text and shared secret. // Bob, step 2: Generate the KEM cipher text and shared secret.
r := new(randReader) cipherText, bobSharedSecret, err := peerPublicKey.KEMEncrypt(crand.Reader)
rand.Seed(time.Now().UnixNano())
cipherText, bobSharedSecret, err := peerPublicKey.KEMEncrypt(r)
if err != nil { if err != nil {
panic(err) panic(err)
} }