75 lines
1.7 KiB
Go
75 lines
1.7 KiB
Go
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package wrapper
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/*
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#cgo CFLAGS: -I../../ref/csidh
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#cgo LDFLAGS: -L../../bin -lcsidh
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#include <csidh.h>
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*/
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import "C"
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import (
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"unsafe"
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csidh "github.com/henrydcase/nobs/dh/csidh"
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)
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const (
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PrvSz = 37
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PubSz = 64
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SsSz = 64
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)
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type Ref struct {}
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// Converts Golang's byte array to C's unsigned char. 'c' must
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// have same size as byte
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func (Ref) toBytes(c []C.uchar, b []byte) {
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if len(c) != len(b) {
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panic("len c!= len b")
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}
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for i,v := range(b) {
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c[i] = C.uchar(v)
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}
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}
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func (Ref) KeygenPrv() (prv csidh.PrivateKey) {
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var buf [PrvSz]C.uchar
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C.keygen_prv(&buf[0])
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prv.Import(C.GoBytes(unsafe.Pointer(&buf[0]), C.int(len(buf))))
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return
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}
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func (c Ref) KeygenPub(prv *csidh.PrivateKey) (pub csidh.PublicKey) {
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var prv_c_buf [PrvSz]C.uchar
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var pub_c_buf [PubSz]C.uchar
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var prv_g_buf [PrvSz]byte
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if !prv.Export(prv_g_buf[:]) {
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panic("Can't export private key")
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}
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c.toBytes(prv_c_buf[:], prv_g_buf[:])
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C.keygen_pub(&pub_c_buf[0], &prv_c_buf[0])
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pub.Import(C.GoBytes(unsafe.Pointer(&pub_c_buf[0]), C.int(len(pub_c_buf))))
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return
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}
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func (c Ref) Derive(ss []byte, pub *csidh.PublicKey, prv *csidh.PrivateKey) {
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var prv_c_buf [PrvSz]C.uchar
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var pub_c_buf [PubSz]C.uchar
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var prv_g_buf [PrvSz]byte
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var pub_g_buf [PubSz]byte
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var ss_c_buf [SsSz]C.uchar
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if !pub.Export(pub_g_buf[:]) {
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panic("Can't export public key")
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}
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if !prv.Export(prv_g_buf[:]) {
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panic("Can't export private key")
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}
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c.toBytes(pub_c_buf[:], pub_g_buf[:])
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c.toBytes(prv_c_buf[:], prv_g_buf[:])
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C.derive(&ss_c_buf[0], &pub_c_buf[0], &prv_c_buf[0])
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copy(ss, C.GoBytes(unsafe.Pointer(&ss_c_buf[0]), C.int(len(ss_c_buf))))
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}
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