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passworder.go
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passworder.go
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package main
import (
"crypto/sha256"
"encoding/base64"
"encoding/hex"
"fmt"
"math/rand"
"os"
"strconv"
"time"
)
// The default password length, if run without any options.
var defaultCodeSize int = 12
var codeSize int
var secretCode, shortCode, secureID, hexCode, encodedSecureID string
var secretSha256Sum [32]byte
var secretCodeSeed [90]string = [90]string{
"w", "l", "f",
"`", "~", "#",
"j", "k", "p",
")", "%", "&",
"g", "h", "e",
"m", "d", "o",
"*", "^", "!",
"i", "q", "v",
"s", "y", "u",
"r", "c", "x",
";", ":", "\\",
"a", "z", "Z",
"Y", "U", "W",
"|", "]", "}",
"V", "X", "T",
"O", "R", "Q",
"[", "{", "+",
"P", "L", "N",
"$", "@", "(",
"M", "S", "D",
"J", "F", "H",
"?", ".", ">",
"G", "K", "E",
",", "<", "-",
"I", "A", "B",
"C", "9", "8",
"7", "6", "1",
"5", "2", "3",
"4", "0", "/",
"t", "b", "n"}
func main() {
if codeSize < defaultCodeSize {
codeSize = defaultCodeSize
}
secretCode = SecretCode(codeSize)
secretSha256Sum = sha256.Sum256([]byte(secretCode[:codeSize]))
encodedSecureID = string(hex.EncodeToString(secretSha256Sum[:]))
shortCode = string(encodedSecureID[:8])
hexCode = string(encodedSecureID[:])
secureID = string(encodedSecureID[:8]) + "-" +
string(encodedSecureID[8:12]) + "-" +
string(encodedSecureID[12:16]) + "-" +
string(encodedSecureID[16:20]) + "-" +
string(encodedSecureID[20:32])
if len(os.Args[1:]) > 0 {
if len(os.Args[2:]) > 0 && os.Args[2] == "-base64" {
var err error
codeSize, err = strconv.Atoi(os.Args[1])
if err != nil {
fmt.Println("Usage: passworder (<number> [-base64]) [-sha256] [-uuid] [-short]")
return
} else {
if codeSize < 4097 {
secretCode = SecretCode(codeSize)
secretBase64 := base64.StdEncoding.EncodeToString([]byte(secretCode[:codeSize]))
fmt.Println(secretBase64)
} else {
fmt.Printf("%v exceeds maximum allowed length of 4096.\n", codeSize)
}
}
}
if len(os.Args[2:]) > 0 && os.Args[2] != "-base64" {
fmt.Println("Usage: passworder (<number> [-base64]) [-sha256] [-uuid] [-short]")
return
}
if len(os.Args[1:]) > 0 && len(os.Args[2:]) == 0 {
options(os.Args[1])
}
} else {
secretCode = SecretCode(codeSize)
secretBase64 := base64.StdEncoding.EncodeToString([]byte(secretCode[:codeSize]))
fmt.Printf("Secret: %s\n", secretCode)
fmt.Printf("Secret Base64: %s\n", secretBase64)
fmt.Printf("UUID: %s\n", secureID)
fmt.Printf("Short Code: %s\n", shortCode)
fmt.Printf("Secret SHA256: %s\n", encodedSecureID)
}
}
func options(op string) {
switch {
case op == "-base64":
secretBase64 := base64.StdEncoding.EncodeToString([]byte(secretCode[:codeSize]))
fmt.Println(secretBase64)
break
case op == "-sha256":
fmt.Println(encodedSecureID)
break
case op == "-short":
fmt.Println(shortCode)
break
case op == "-uuid":
fmt.Println(secureID)
break
default:
var err error
codeSize, err = strconv.Atoi(op)
if err != nil {
fmt.Println("Usage: passworder (<number> [-base64]) [-sha256] [-uuid] [-short]")
return
} else {
if codeSize < 4097 {
secretCode = SecretCode(codeSize)
secretBase64 := base64.StdEncoding.EncodeToString([]byte(secretCode[:codeSize]))
fmt.Printf("Secret: %s\n", secretCode)
fmt.Printf("Secret Base64: %s\n", secretBase64)
} else {
fmt.Printf("%v exceeds maximum allowed length of 4096.\n", codeSize)
}
}
}
}
func SecretCode(rotations int) string {
var s string
v := make([]int, rotations)
// Populate array "v" with "n" number of random
// characters selected from []string "secretCodeSeed".
for n := 0; n < rotations; n++ {
rand.Seed(time.Now().UnixNano())
for _, value := range rand.Perm(len(secretCodeSeed)) {
v[n] = value
}
}
// Generate "x" amount of random characters
// according to int specified with "rotations".
for x := 0; x < rotations; x++ {
s = s + secretCodeSeed[v[x]]
}
return s
}