package main import (     "code.google.com/p/go.crypto/ssh"     "crypto"     "crypto/rsa"     "crypto/x509"     "encoding/pem"     "fmt"     "io" ) const privateKey = `content of id_rsa` type keychain struct {     key *rsa.PrivateKey } func (k *keychain) Key(i int) (interface{}, error) {     if i != 0 {         return nil, nil     }     return &k.key.PublicKey, nil } func (k *keychain) Sign(i int, rand io.Reader, data []byte) (sig []byte, err error) {     hashFunc := crypto.SHA1     h := hashFunc.New()     h.Write(data)     digest := h.Sum(nil)     return rsa.SignPKCS1v15(rand, k.key, hashFunc, digest) } func main() {     block, _ := pem.Decode([]byte(privateKey))     rsakey, _ := x509.ParsePKCS1PrivateKey(block.Bytes)     clientKey := &keychain{rsakey}     clientConfig := &ssh.ClientConfig{         User: "wuhao",         Auth: []ssh.ClientAuth{             ssh.ClientAuthKeyring(clientKey),         },     }     client, err := ssh.Dial("tcp", "127.0.0.1:22", clientConfig)     if err != nil {         panic("Failed to dial: " + err.Error())     }     session, err := client.NewSession()     if err != nil {         panic("Failed to create session: " + err.Error())     }     defer session.Close()     go func() {         w, _ := session.StdinPipe()         defer w.Close()         content := "123456789\n"         fmt.Fprintln(w, "C0644", len(content), "testfile")         fmt.Fprint(w, content)         fmt.Fprint(w, "\x00") // 传输以\x00结束     }()     if err := session.Run("/usr/bin/scp -qrt ./"); err != nil {         panic("Failed to run: " + err.Error())     } }