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age_bind.go
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/
age_bind.go
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package aged
import (
"bytes"
"errors"
"fmt"
"io"
"regexp"
"filippo.io/age"
"github.com/D3vl0per/crypt/compression"
)
type Keychain struct {
secretKey *age.X25519Identity
recipients []age.Recipient
}
type SetupKeychainParameters struct {
SecretKey string
PublicKeys []string
SelfRecipient bool
}
func SetupKeychain(keychainSetup SetupKeychainParameters) (Keychain, error) {
var keychain Keychain
identity, err := age.ParseX25519Identity(keychainSetup.SecretKey)
if err != nil {
return Keychain{}, err
}
keychain.secretKey = identity
for _, e := range keychainSetup.PublicKeys {
if e == "" {
continue
}
if identity.Recipient().String() != e {
publicKey, err := age.ParseX25519Recipient(e)
if err != nil {
return Keychain{}, err
}
keychain.recipients = append(keychain.recipients, publicKey)
}
}
if keychainSetup.SelfRecipient {
keychain.recipients = append(keychain.recipients, identity.Recipient())
}
return keychain, nil
}
func GenKeypair() (*age.X25519Identity, error) {
identity, err := age.GenerateX25519Identity()
if err != nil {
return identity, err
}
return identity, nil
}
func GenSecretKey() (string, error) {
identity, err := age.GenerateX25519Identity()
if err != nil {
return "", err
}
return identity.String(), nil
}
type Parameters struct {
Data []byte
Compressor compression.Compressor
Obfuscator Obfuscation
}
func (k Keychain) Encrypt(p Parameters) ([]byte, error) {
in, err := compressor(p)
if err != nil {
return nil, err
}
out := &bytes.Buffer{}
w, err := age.Encrypt(out, k.recipients...)
if err != nil {
return nil, err
}
if _, err := io.Copy(w, in); err != nil {
return nil, err
}
if err := w.Close(); err != nil {
return nil, err
}
return obfuscator(p, out.Bytes())
}
func (k Keychain) Decrypt(p Parameters) ([]byte, error) {
cipherData, err := deobfuscator(p)
if err != nil {
return nil, err
}
r, err := age.Decrypt(bytes.NewReader(cipherData), k.secretKey)
if err != nil {
return nil, err
}
out := &bytes.Buffer{}
if _, err := io.Copy(out, r); err != nil {
return nil, err
}
return decompressor(p, out.Bytes())
}
func EncryptWithPwd(p Parameters, pwd string) ([]byte, error) {
in, err := compressor(p)
if err != nil {
return nil, err
}
pwdRecepient, err := age.NewScryptRecipient(pwd)
if err != nil {
return nil, err
}
out := &bytes.Buffer{}
w, err := age.Encrypt(out, pwdRecepient)
if err != nil {
return nil, err
}
if _, err := io.Copy(w, in); err != nil {
return nil, err
}
if err := w.Close(); err != nil {
return nil, err
}
return obfuscator(p, out.Bytes())
}
func DecryptWithPwd(p Parameters, pwd string) ([]byte, error) {
cipherData, err := deobfuscator(p)
if err != nil {
return nil, err
}
pwdIdentity, err := age.NewScryptIdentity(pwd)
if err != nil {
return nil, err
}
r, err := age.Decrypt(bytes.NewReader(cipherData), pwdIdentity)
if err != nil {
return nil, err
}
out := &bytes.Buffer{}
if _, err := io.Copy(out, r); err != nil {
return nil, err
}
return decompressor(p, out.Bytes())
}
func compressor(p Parameters) (*bytes.Reader, error) {
var in *bytes.Reader
if p.Compressor != nil {
var writer bytes.Buffer
compressorIn := bytes.NewReader(p.Data)
err := p.Compressor.CompressStream(compressorIn, &writer)
if err != nil {
return nil, err
}
in = bytes.NewReader(writer.Bytes())
} else {
in = bytes.NewReader(p.Data)
}
return in, nil
}
func decompressor(p Parameters, data []byte) ([]byte, error) {
if p.Compressor != nil {
raw, err := p.Compressor.Decompress(data)
if err != nil {
return nil, err
}
return raw, nil
}
return data, nil
}
func obfuscator(p Parameters, in []byte) ([]byte, error) {
if p.Obfuscator != nil {
obf, err := p.Obfuscator.Obfuscate(in)
if err != nil {
return nil, errors.New("failed to obfuscate header")
}
return obf, nil
}
return in, nil
}
func deobfuscator(p Parameters) ([]byte, error) {
var cipherData []byte
if p.Obfuscator != nil {
var err error
cipherData, err = p.Obfuscator.Deobfuscate(p.Data)
if err != nil {
return nil, errors.New("failed to deobfuscate header, maybe not obfuscated?")
}
} else {
cipherData = p.Data
}
return cipherData, nil
}
func (k Keychain) KeychainExport() []string {
keys := make([]string, len(k.recipients))
for _, key := range k.recipients {
keys = append(keys, fmt.Sprint(key))
}
return keys
}
func (k Keychain) KeychainExportSecretKey() string {
return k.secretKey.String()
}
const AgePublicKeyPattern = "^age1[a-z0-9]{58}$"
const AgePrivateKeyPattern = "^AGE-SECRET-KEY-1[A-Z0-9]{58}$"
func CheckPublicKeyFormat(key string) bool {
return regexp.MustCompile(AgePublicKeyPattern).MatchString(key)
}
func CheckPrivateKeyFormat(key string) bool {
return regexp.MustCompile(AgePrivateKeyPattern).MatchString(key)
}