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124 lines
2.7 KiB
Go
124 lines
2.7 KiB
Go
package main
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import (
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"bytes"
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"crypto/rand"
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"crypto/rsa"
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"encoding/base64"
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"encoding/json"
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"fmt"
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"io/ioutil"
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"os"
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)
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func generate() {
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priv, err := rsa.GenerateKey(rand.Reader, keyLength)
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if err != nil {
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exit(1, "couldn't generate private key: %v", err)
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}
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json.NewEncoder(os.Stdout).Encode(priv)
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}
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func encrypt() {
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key, err := publicKey()
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if err != nil {
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exit(1, "couldn't setup key: %v", err)
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}
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msg, err := ioutil.ReadAll(os.Stdin)
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if err != nil {
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exit(1, "error reading input message: %v", err)
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}
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ctxt, err := rsa.EncryptPKCS1v15(rand.Reader, key, msg)
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if err != nil {
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exit(1, "error encrypting message: %v", err)
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}
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var buf bytes.Buffer
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enc := base64.NewEncoder(base64.StdEncoding, &buf)
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if _, err := enc.Write(ctxt); err != nil {
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exit(1, "error b64 encoding ciphertext: %v", err)
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}
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enc.Close()
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b64 := buf.Bytes()
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os.Stdout.Write(b64)
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os.Stdout.Close()
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}
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func decrypt() {
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key, err := privateKey()
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if err != nil {
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exit(1, "couldn't setup key: %v", err)
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}
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raw, err := ioutil.ReadAll(os.Stdin)
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if err != nil {
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exit(1, "error reading input message: %v", err)
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}
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buf := bytes.NewBuffer(raw)
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decoder := base64.NewDecoder(base64.StdEncoding, buf)
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ctxt, err := ioutil.ReadAll(decoder)
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if err != nil {
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exit(1, "error reading b64 buffer %v", err)
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}
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msg, err := rsa.DecryptPKCS1v15(rand.Reader, key, ctxt)
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if err != nil {
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exit(1, "error decrypting message: %v", err)
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}
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fmt.Printf("%s", msg)
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}
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func publicKey() (*rsa.PublicKey, error) {
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if options.publicKey == "" {
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priv, err := privateKey()
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if err != nil {
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return nil, err
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}
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return &priv.PublicKey, nil
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}
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f, err := os.Open(options.publicKey)
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if err != nil {
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return nil, fmt.Errorf("unable to read public key from file %s: %v", options.publicKey, err)
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}
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defer f.Close()
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d1 := json.NewDecoder(f)
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var key rsa.PublicKey
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if err := d1.Decode(&key); err != nil {
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return nil, fmt.Errorf("unable to decode key from file %s: %v", options.key, err)
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}
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return &key, nil
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}
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func privateKey() (*rsa.PrivateKey, error) {
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f, err := os.Open(options.key)
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if err != nil {
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return nil, fmt.Errorf("unable to open private key file at %s: %v", options.key, err)
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}
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defer f.Close()
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d1 := json.NewDecoder(f)
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var key rsa.PrivateKey
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if err := d1.Decode(&key); err != nil {
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return nil, fmt.Errorf("unable to decode key from file %s: %v", options.key, err)
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}
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return &key, nil
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}
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func getPublic() {
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priv, err := privateKey()
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if err != nil {
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exit(1, "unable to read private key file: %v", err)
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}
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if err := json.NewEncoder(os.Stdout).Encode(priv.PublicKey); err != nil {
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exit(1, "unable to marshal key: %v", err)
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}
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}
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type KeyRequest string
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func (k KeyRequest) Kind() string {
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return "key"
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}
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