From f37377dd63b795c566f1e7a3191eeac6e217a0e2 Mon Sep 17 00:00:00 2001
From: Brian Buller <brian@bullercodeworks.com>
Date: Wed, 25 Jan 2017 11:58:37 -0600
Subject: [PATCH] Passage Library Works

---
 gopass-cmd/.gitignore |  1 +
 gopass-cmd/main.go    | 18 +++++++++++
 passage.go            | 69 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 88 insertions(+)
 create mode 100644 gopass-cmd/.gitignore
 create mode 100644 gopass-cmd/main.go
 create mode 100644 passage.go

diff --git a/gopass-cmd/.gitignore b/gopass-cmd/.gitignore
new file mode 100644
index 0000000..768e8ba
--- /dev/null
+++ b/gopass-cmd/.gitignore
@@ -0,0 +1 @@
+gopass-cmd
diff --git a/gopass-cmd/main.go b/gopass-cmd/main.go
new file mode 100644
index 0000000..9e08774
--- /dev/null
+++ b/gopass-cmd/main.go
@@ -0,0 +1,18 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	passage "gogs.bullercodeworks.com/brian/passage-go"
+)
+
+func main() {
+	if len(os.Args) < 3 {
+		fmt.Println("Usage: gopass <pin> <door>")
+		os.Exit(1)
+	}
+	p := passage.CreatePassage(os.Args[1])
+	fmt.Println("Checksum: " + p.GetChecksumAsString())
+	fmt.Println("Password: " + p.GetPassword(os.Args[2]))
+}
diff --git a/passage.go b/passage.go
new file mode 100644
index 0000000..ec1bd05
--- /dev/null
+++ b/passage.go
@@ -0,0 +1,69 @@
+package passage
+
+import (
+	"crypto/sha256"
+	"strconv"
+)
+
+const (
+	UseLower = 1 << iota
+	UseUpper
+	UseNumber
+	UseSymbol
+)
+
+type Passage struct {
+	valids int
+	length int
+	pin    string
+}
+
+func CreatePassage(pin string) *Passage {
+	p := new(Passage)
+	p.length = 20
+	p.valids = UseLower | UseUpper | UseNumber | UseSymbol
+	p.pin = pin
+	return p
+}
+
+func (p *Passage) SetPin(pin string) {
+	p.pin = pin
+}
+
+func (p *Passage) GetPassword(door string) string {
+	ret := ""
+	validChars := ""
+	if p.valids&UseLower == UseLower {
+		validChars += "abcdefghijklmnopqrstuvwxyz"
+	}
+	if p.valids&UseUpper == UseUpper {
+		validChars += "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+	}
+	if p.valids&UseNumber == UseNumber {
+		validChars += "1234567890"
+	}
+	hashing := p.pin + " - " + door
+	shaArr := sha256.Sum256([]byte(hashing))
+	var sha []byte
+	for i := range shaArr {
+		sha = append(sha, shaArr[i])
+	}
+	for i := 0; i < p.length; i++ {
+		//for i := range sha {
+		ret += string(validChars[int(sha[i])%len(validChars)])
+	}
+	return ret
+}
+
+func (p *Passage) GetChecksum() int {
+	ret := 0
+	sha := sha256.Sum256([]byte(p.pin))
+	for i := range sha {
+		ret += int(sha[i])
+	}
+	return ret
+}
+
+func (p *Passage) GetChecksumAsString() string {
+	return strconv.Itoa(p.GetChecksum())
+}