forked from keybase/client
/
main.go
175 lines (156 loc) · 4.76 KB
/
main.go
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package main
import (
"encoding/hex"
"fmt"
"io"
"log"
"os"
"strconv"
docopt "github.com/docopt/docopt-go"
"github.com/keybase/client/go/chat/signencrypt"
"github.com/keybase/client/go/kbcrypto"
"github.com/keybase/go-crypto/ed25519"
)
func failf(format string, args ...interface{}) {
log.Print(fmt.Sprintf(format, args...))
os.Exit(1)
}
func decodeHexArg(arg string) []byte {
decoded, err := hex.DecodeString(arg)
if err != nil {
failf("'%s' is not valid hex: %s", arg, err)
}
return decoded
}
func zeroSecretboxKey() signencrypt.SecretboxKey {
var key [signencrypt.SecretboxKeySize]byte // all zeroes
return &key
}
func zeroNonce() signencrypt.Nonce {
var nonce [signencrypt.NonceSize]byte // all zeroes
return &nonce
}
func zeroVerifyKey() signencrypt.VerifyKey {
var key [ed25519.PublicKeySize]byte
// Generated from libsodium's crypto_sign_seed_keypair with a zero seed.
copy(key[:], ";j'\xbc\xce\xb6\xa4-b\xa3\xa8\xd0*o\rse2\x15w\x1d\xe2C\xa6:\xc0H\xa1\x8bY\xda)")
return &key
}
func zeroSignKey() signencrypt.SignKey {
var key [ed25519.PrivateKeySize]byte
// Generated from libsodium's crypto_sign_seed_keypair with a zero seed.
copy(key[:], "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00;j'\xbc\xce\xb6\xa4-b\xa3\xa8\xd0*o\rse2\x15w\x1d\xe2C\xa6:\xc0H\xa1\x8bY\xda)")
return &key
}
func seal(enckey signencrypt.SecretboxKey, signkey signencrypt.SignKey, signaturePrefix kbcrypto.SignaturePrefix, nonce signencrypt.Nonce, chunklen int64) error {
encoder := signencrypt.NewEncoder(enckey, signkey, signaturePrefix, nonce)
if chunklen != 0 {
encoder.ChangePlaintextChunkLenForTesting(chunklen)
}
var buf [4096]byte
for {
num, err := os.Stdin.Read(buf[:])
if err == io.EOF {
break
} else if err != nil {
return err
}
encoded := encoder.Write(buf[0:num])
_, err = os.Stdout.Write(encoded)
if err != nil {
return err
}
}
encoded := encoder.Finish()
_, err := os.Stdout.Write(encoded)
if err != nil {
return err
}
return nil
}
func open(enckey signencrypt.SecretboxKey, verifykey signencrypt.VerifyKey, signaturePrefix kbcrypto.SignaturePrefix, nonce signencrypt.Nonce, chunklen int64) error {
decoder := signencrypt.NewDecoder(enckey, verifykey, signaturePrefix, nonce)
if chunklen != 0 {
decoder.ChangePlaintextChunkLenForTesting(chunklen)
}
var buf [4096]byte
for {
num, err := os.Stdin.Read(buf[:])
if err == io.EOF {
break
} else if err != nil {
return err
}
decoded, err := decoder.Write(buf[0:num])
if err != nil {
return err
}
_, err = os.Stdout.Write(decoded)
if err != nil {
return err
}
}
decoded, err := decoder.Finish()
if err != nil {
return err
}
_, err = os.Stdout.Write(decoded)
if err != nil {
return err
}
return nil
}
func main() {
usage := `Usage:
example seal [--enckey=<enckey>] [--signkey=<signkey>]
[--sigprefix=<sigprefix>] [--nonce=<nonce>] [--chunklen=<chunklen>]
example open [--enckey=<enckey>] [--verifykey=<signkey>]
[--sigprefix=<sigprefix>] [--nonce=<nonce>] [--chunklen=<chunklen>]
Options:
--enckey=<enckey> the 32-byte encryption key (in hex)
--signkey=<signkey> the 64-byte signing private key (in hex)
--verifykey=<verifykey> the 32-byte signing public key (in hex)
--sigprefix=<sigprefix> the signature prefix (string)
--nonce=<nonce> the 16-byte nonce
--chunklen=<chunklen> the size of plaintext chunks, for testing, default 2^20 bytes
`
arguments, _ := docopt.Parse(usage, nil, true, "signencrypt crypto example", false)
enckey := zeroSecretboxKey()
if arguments["--enckey"] != nil {
copy(enckey[:], decodeHexArg(arguments["--enckey"].(string)))
}
signkey := zeroSignKey()
if arguments["--signkey"] != nil {
copy(signkey[:], decodeHexArg(arguments["--signkey"].(string)))
}
verifykey := zeroVerifyKey()
if arguments["--verifykey"] != nil {
copy(verifykey[:], decodeHexArg(arguments["--verifykey"].(string)))
}
signaturePrefix := kbcrypto.SignaturePrefixTesting
if arguments["--sigprefix"] != nil {
signaturePrefixStr := arguments["--sigprefix"].(string)
signaturePrefix = kbcrypto.SignaturePrefix(signaturePrefixStr)
}
nonce := zeroNonce()
if arguments["--nonce"] != nil {
copy(nonce[:], decodeHexArg(arguments["--nonce"].(string)))
}
var chunklen int64
if arguments["--chunklen"] != nil {
parsed, err := strconv.Atoi(arguments["--chunklen"].(string))
if err != nil {
failf("error converting: %s", err)
}
chunklen = int64(parsed)
}
var err error
if arguments["seal"].(bool) {
err = seal(enckey, signkey, signaturePrefix, nonce, chunklen)
} else {
err = open(enckey, verifykey, signaturePrefix, nonce, chunklen)
}
if err != nil {
failf("crypto error: %s", err)
}
}