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package main
import (
"bytes"
"crypto/sha1"
"encoding/base64"
"fmt"
"math/rand"
)
// Encode encodes the []byte of raw password
func SSHAEncode(rawPassPhrase []byte) string {
hash := makeSSHAHash(rawPassPhrase, makeSalt())
b64 := base64.StdEncoding.EncodeToString(hash)
return fmt.Sprintf("{ssha}%s", b64)
}
// Matches matches the encoded password and the raw password
func SSHAMatches(encodedPassPhrase string, rawPassPhrase []byte) bool {
if encodedPassPhrase[:6] != "{ssha}" {
return false
}
bhash, err := base64.StdEncoding.DecodeString(encodedPassPhrase[6:])
if err != nil {
return false
}
salt := bhash[20:]
newssha := makeSSHAHash(rawPassPhrase, salt)
if bytes.Compare(newssha, bhash) != 0 {
return false
}
return true
}
// makeSalt make a 32 byte array containing random bytes.
func makeSalt() []byte {
sbytes := make([]byte, 32)
rand.Read(sbytes)
return sbytes
}
// makeSSHAHash make hasing using SHA-1 with salt. This is not the final output though. You need to append {SSHA} string with base64 of this hash.
func makeSSHAHash(passphrase, salt []byte) []byte {
sha := sha1.New()
sha.Write(passphrase)
sha.Write(salt)
h := sha.Sum(nil)
return append(h, salt...)
}
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