Support creating word-ish password

This adds the NewWordish() func

passgen/passgen.go

@@ -1,4 +1,4 @@
-// Package passgen generates random, unmemorable passwords.
+// Package passgen generates random passwords.
 //
 // Example usage:
 //
@@ -19,20 +19,20 @@ const DefLen = 20
 // DefChars is the default set of characters used in the password.
 var DefChars = []byte("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789!@#$%^&*()- _=+,.?/:;{}[]`~")
 
-// New returns a random password of the default length with the default set of
-// characters.
+// New returns a random, unmemorable password of the default length with the
+// default set of characters.
 func New() string {
 	return NewLenChars(DefLen, DefChars)
 }
 
-// NewLen returns a random password of the given length with the default set
-// of characters.
+// NewLen returns a random, unmemorable password of the given length with the
+// default set of characters.
 func NewLen(length int) string {
 	return NewLenChars(length, DefChars)
 }
 
-// NewLenChars returns a random password of the given length with the given
-// set of characters.
+// NewLenChars returns a random, unmemorable password of the given length with
+// the given set of characters.
 func NewLenChars(length int, chars []byte) string {
 	if length == 0 {
 		return ""

passgen/wordish.go

@@ -0,0 +1,64 @@
+package passgen
+
+import (
+	"crypto/rand"
+	"math/big"
+)
+
+var (
+	ar   = []rune("aA4")
+	cr   = []rune("cC")
+	er   = []rune("eE3")
+	fr   = []rune("fF")
+	gr   = []rune("gG")
+	hr   = []rune("hH")
+	ir   = []rune("iI1")
+	lr   = []rune("lL")
+	nr   = []rune("nN")
+	or   = []rune("oO0")
+	rr   = []rune("rR")
+	sr   = []rune("sS5")
+	tr   = []rune("tT7")
+	remr = []rune("bcdfghjklmnpqrstvwxyzBCDFGHJKLMNPQRSTVWXYZ0123456789")
+)
+
+// NewWordish generates a password made of word-like words.
+func NewWordish() string {
+	b := []rune{}
+	b = append(b, randLetter(cr))
+	b = append(b, randLetter(hr))
+	b = append(b, randLetter(ar))
+	b = append(b, randLetter(nr))
+	b = append(b, randLetter(gr))
+	b = append(b, randLetter(er))
+	b = append(b, randLetter(tr))
+	b = append(b, randLetter(hr))
+	b = append(b, randLetter(ir))
+	b = append(b, randLetter(sr))
+	b = append(b, randLetter(ar))
+	b = append(b, randLetter(fr))
+	b = append(b, randLetter(tr))
+	b = append(b, randLetter(er))
+	b = append(b, randLetter(rr))
+	b = append(b, randLetter(lr))
+	b = append(b, randLetter(or))
+	b = append(b, randLetter(gr))
+	b = append(b, randLetter(gr))
+	b = append(b, randLetter(ir))
+	b = append(b, randLetter(nr))
+	b = append(b, randLetter(gr))
+	b = append(b, randLetter(ir))
+	b = append(b, randLetter(nr))
+	for i := 0; i <= 7; i++ {
+		b = append(b, randLetter(remr))
+	}
+	return string(b)
+}
+
+func randLetter(l []rune) rune {
+	li, err := rand.Int(rand.Reader, big.NewInt(int64(len(l))))
+	if err != nil {
+		return rune(-1)
+	}
+	return l[li.Int64()]
+}