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package main
import (
"encoding/hex"
"flag"
"fmt"
"os"
"salsa.debian.org/vasudev/ed25519group"
"salsa.debian.org/vasudev/gospake2"
group "salsa.debian.org/vasudev/gospake2/groups"
"salsa.debian.org/vasudev/integergroup"
)
func main() {
// Parse command line arguments
flag.Parse()
params := make(map[string]group.Group)
params["I1024"] = group.Group(integergroup.I1024)
params["I2048"] = group.Group(integergroup.I2048)
params["I3072"] = group.Group(integergroup.I3072)
params["Ed25519"] = group.Group(ed25519group.Ed25519{})
if len(flag.Args()) < 2 {
fmt.Fprintf(os.Stderr,
"Usage %s A|B|Symmetric password [I1024|I2048|I3072|Ed25519]", os.Args[0])
os.Exit(1)
}
side := flag.Arg(0)
password := gospake2.NewPassword(flag.Arg(1))
var grp group.Group
if len(flag.Args()) > 2 {
_, ok := params[flag.Arg(2)]
if !ok {
fmt.Fprintf(os.Stderr, "Invalid Group: Group can be only one of I1024, I2048, I3072 or Ed25519\n")
os.Exit(1)
}
grp, _ = params[flag.Arg(2)]
} else {
grp = params["Ed25519"]
}
var spake gospake2.SPAKE2
if side == "A" || side == "B" {
if side == "A" {
spake = gospake2.SPAKE2A(password, gospake2.NewIdentityA(""), gospake2.NewIdentityB(""))
} else {
spake = gospake2.SPAKE2B(password, gospake2.NewIdentityA(""), gospake2.NewIdentityB(""))
}
} else {
spake = gospake2.SPAKE2Symmetric(password, gospake2.NewIdentityS(""))
}
spake.SetGroup(grp)
m := spake.Start()
fmt.Fprintf(os.Stdout, "%x\n", m)
var inmessage string
fmt.Scanf("%s", &inmessage)
inbytes, err := hex.DecodeString(inmessage)
if err != nil {
fmt.Fprintf(os.Stderr, "ERROR: Could not decode line (%s): %s\n",
inmessage, err)
os.Exit(1)
}
key, _ := spake.Finish(inbytes)
fmt.Fprintf(os.Stdout, "%x\n", key)
}
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