54 lines
1.2 KiB
Go
54 lines
1.2 KiB
Go
package main
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import (
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"bytes"
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"crypto/sha1"
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"encoding/base64"
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"fmt"
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"math/rand"
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)
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// Encode encodes the []byte of raw password
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func SSHAEncode(rawPassPhrase []byte) string {
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hash := makeSSHAHash(rawPassPhrase, makeSalt())
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b64 := base64.StdEncoding.EncodeToString(hash)
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return fmt.Sprintf("{ssha}%s", b64)
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}
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// Matches matches the encoded password and the raw password
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func SSHAMatches(encodedPassPhrase string, rawPassPhrase []byte) bool {
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if encodedPassPhrase[:6] != "{ssha}" {
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return false
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}
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bhash, err := base64.StdEncoding.DecodeString(encodedPassPhrase[6:])
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if err != nil {
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return false
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}
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salt := bhash[20:]
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newssha := makeSSHAHash(rawPassPhrase, salt)
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if bytes.Compare(newssha, bhash) != 0 {
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return false
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}
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return true
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}
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// makeSalt make a 32 byte array containing random bytes.
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func makeSalt() []byte {
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sbytes := make([]byte, 32)
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rand.Read(sbytes)
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return sbytes
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}
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// 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.
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func makeSSHAHash(passphrase, salt []byte) []byte {
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sha := sha1.New()
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sha.Write(passphrase)
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sha.Write(salt)
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h := sha.Sum(nil)
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return append(h, salt...)
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}
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