我正在玩Go的openpgp包，方法是制作一個(gè)簡單的程序來加密一條短消息并用 ASCII 碼來保護(hù)它。我目前擁有的代碼是：package mainimport ( "code.google.com/p/go.crypto/openpgp" "code.google.com/p/go.crypto/openpgp/armor" "fmt" "log" "os")func main() { to, err := openpgp.NewEntity("John Smith", "comment", "john@example.com", nil) if err != nil { log.Fatal(err) } from, err := openpgp.NewEntity("John Smith", "comment", "john@example.com", nil) if err != nil { log.Fatal(err) } recipients := []*openpgp.Entity{to} armorer, err := armor.Encode(os.Stdout, "PGP MESSAGE", nil) if err != nil { log.Fatal(err) } defer armorer.Close() encrypter, err := openpgp.Encrypt(armorer, recipients, from, nil, nil) if err != nil { log.Fatal(err) } defer encrypter.Close() fmt.Fprintf(encrypter, "Hello! How are you?")}當(dāng)我運(yùn)行它時(shí)，我得到輸出：-----BEGIN PGP MESSAGE-----wcBMA5iJWayscZQHAQgAvHQtyGxzyHJNYQlK7bcYZnWRm1gHsRRVZIgPTxtqnklpKgCYOuv5dtgqUXinJWZnk3DozR7xbMj/c9oSlifJ9FiPnTaLLOIVhv2Jf7w9ydh3oig3vpL8rI/ha9bOJsNdznt3/z1ZLVghPsrRGHO7LWUTWQUn/cgQZXr/z5CpGQP0TFlMcbBuuwE2ffplAGkBSQlXNRx1ZsY6T+MjajWwcik/CjJ/NnzRpURpXFIWc85xHQbUexQzEghyh4t5NEQhx9UvmLtnKPmwnhxX3s43Zcd1VtzSXc77giE08fSdIDdHeDClMno6jsoWhmubXZVXOHqf+z5euEcxvYyk16N/jdLgAeMBTSifCFR8YuGBmOFADONO/4/M1ye76+KyhsbF4KTgK+CW4Rjg4NLi0ubP1A===YD2p-----END PGP MESSAGE-----panic: crypto: requested hash function is unavailablegoroutine 1 [running]:crypto.Hash.New(0x9, 0x21027c4b0, 0x1d3300) /usr/local/Cellar/go/1.1.1/src/pkg/crypto/crypto.go:62 +0xabcode.google.com/p/go.crypto/openpgp.Encrypt(0x210299e70, 0x2102e76e0, 0x2210284f38, 0x1, 0x1, ...) /Users/cb/workspace/go/src/code.google.com/p/go.crypto/openpgp/write.go:289 +0x1141main.main() /Users/cb/workspace/go/src/github.com/xoebus/gpg/go-gpg.go:31 +0x425exit status 2看起來它正在輸出裝甲密文（似乎無效）然后崩潰，因?yàn)樗也坏芥溄拥蕉M(jìn)制文件的注冊哈希函數(shù)。據(jù)我所知，默認(rèn)情況下它應(yīng)該使用標(biāo)準(zhǔn)庫中的一個(gè) SHA 哈希值，這絕對應(yīng)該被鏈接？我究竟做錯(cuò)了什么？
1 回答
白豬掌柜的
TA貢獻(xiàn)1893條經(jīng)驗(yàn) 獲得超10個(gè)贊
散列函數(shù)必須由import _ "whatever". 不會自動鏈接到您的二進(jìn)制文件中。實(shí)際上，沒有明確（或可傳遞地）導(dǎo)入的內(nèi)容。但是，如果您直接使用一些非導(dǎo)入的實(shí)體，編譯器/鏈接器會抱怨。散列函數(shù) OTOH 以及 stdlib 的其他一些部分通過散列接口使用一種后期綁定。
(09:25) jnml@fsc-r550:~/src/tmp/SO/17986762$ cat main.go
package main
import (
"fmt"
"log"
"os"
"code.google.com/p/go.crypto/openpgp"
"code.google.com/p/go.crypto/openpgp/armor"
_ "code.google.com/p/go.crypto/ripemd160"
)
func main() {
to, err := openpgp.NewEntity("John Smith", "comment", "john@example.com", nil)
if err != nil {
log.Fatal(err)
}
from, err := openpgp.NewEntity("John Smith", "comment", "john@example.com", nil)
if err != nil {
log.Fatal(err)
}
recipients := []*openpgp.Entity{to}
armorer, err := armor.Encode(os.Stdout, "PGP MESSAGE", nil)
if err != nil {
log.Fatal(err)
}
defer armorer.Close()
encrypter, err := openpgp.Encrypt(armorer, recipients, from, nil, nil)
if err != nil {
log.Fatal(err)
}
defer encrypter.Close()
fmt.Fprintf(encrypter, "Hello! How are you?")
}
(09:25) jnml@fsc-r550:~/src/tmp/SO/17986762$ go run main.go
-----BEGIN PGP MESSAGE-----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=
=wWmw
-----END PGP MESSAGE-----(09:26) jnml@fsc-r550:~/src/tmp/SO/17986762$
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