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https://github.com/wneessen/apg-go.git
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Merge pull request #37 from wneessen/rng_change
Updated GetChar() method to use a much faster and optimized algorithm
This commit is contained in:
GitHub
commit
f094820bc3
5 changed files with 50 additions and 24 deletions
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@ -4,9 +4,12 @@
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<option name="autoReloadType" value="ALL" />
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</component>
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<component name="ChangeListManager">
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<list default="true" id="e32960c0-29e5-4669-9fc2-ef12314486ce" name="Changes" comment="Updated README.md and added code-example for programmatic use">
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<list default="true" id="e32960c0-29e5-4669-9fc2-ef12314486ce" name="Changes" comment="Some parts of the Config struct don't need exporting">
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<change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
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<change beforePath="$PROJECT_DIR$/config/config.go" beforeDir="false" afterPath="$PROJECT_DIR$/config/config.go" afterDir="false" />
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<change beforePath="$PROJECT_DIR$/cmd/apg/apg.go" beforeDir="false" afterPath="$PROJECT_DIR$/cmd/apg/apg.go" afterDir="false" />
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<change beforePath="$PROJECT_DIR$/cmd/apg/apg_test.go" beforeDir="false" afterPath="$PROJECT_DIR$/cmd/apg/apg_test.go" afterDir="false" />
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<change beforePath="$PROJECT_DIR$/example-code/simple-password-generator/main.go" beforeDir="false" afterPath="$PROJECT_DIR$/example-code/simple-password-generator/main.go" afterDir="false" />
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<change beforePath="$PROJECT_DIR$/random/random.go" beforeDir="false" afterPath="$PROJECT_DIR$/random/random.go" afterDir="false" />
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</list>
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<option name="SHOW_DIALOG" value="false" />
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<option name="HIGHLIGHT_CONFLICTS" value="true" />
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@ -107,7 +110,8 @@
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<MESSAGE value="More README.md updates" />
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<MESSAGE value="Updated CLI usage text to reflect the changes of #27" />
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<MESSAGE value="Updated README.md and added code-example for programmatic use" />
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<option name="LAST_COMMIT_MESSAGE" value="Updated README.md and added code-example for programmatic use" />
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<MESSAGE value="Some parts of the Config struct don't need exporting" />
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<option name="LAST_COMMIT_MESSAGE" value="Some parts of the Config struct don't need exporting" />
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</component>
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<component name="VgoProject">
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<integration-enabled>true</integration-enabled>
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@ -102,7 +102,7 @@ func main() {
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sylList[pwString] = pwSyls
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default:
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charRange := chars.GetRange(&cfgObj)
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pwString, err := random.GetChar(&charRange, pwLength)
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pwString, err := random.GetChar(charRange, pwLength)
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if err != nil {
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log.Fatalf("error generating random character range: %s\n", err)
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}
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@ -77,7 +77,7 @@ func TestGenLength(t *testing.T) {
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cfgObj.MaxPassLen = testCase.maxLength
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pwLength := config.GetPwLengthFromParams(&cfgObj)
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for i := 0; i < 1000; i++ {
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pwString, err := random.GetChar(&charRange, pwLength)
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pwString, err := random.GetChar(charRange, pwLength)
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if err != nil {
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t.Errorf("getRandChar returned an error: %q", err)
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}
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@ -99,7 +99,7 @@ func TestGenLength(t *testing.T) {
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func TestGetRandChar(t *testing.T) {
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t.Run("return_value_is_A_B_or_C", func(t *testing.T) {
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charRange := "ABC"
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randChar, err := random.GetChar(&charRange, 1)
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randChar, err := random.GetChar(charRange, 1)
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if err != nil {
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t.Fatalf("Random character generation failed => %v", err.Error())
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}
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@ -110,7 +110,7 @@ func TestGetRandChar(t *testing.T) {
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t.Run("return_value_has_specific_length", func(t *testing.T) {
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charRange := "ABC"
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randChar, err := random.GetChar(&charRange, 1000)
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randChar, err := random.GetChar(charRange, 1000)
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if err != nil {
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t.Fatalf("Random character generation failed => %v", err.Error())
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}
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@ -122,7 +122,7 @@ func TestGetRandChar(t *testing.T) {
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t.Run("fail", func(t *testing.T) {
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charRange := "ABC"
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randChar, err := random.GetChar(&charRange, -2000)
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randChar, err := random.GetChar(charRange, -2000)
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if err == nil {
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t.Fatalf("Generated random characters expected to fail, but returned a value => %v",
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randChar)
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@ -255,7 +255,7 @@ func BenchmarkGetRandNum(b *testing.B) {
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func BenchmarkGetRandChar(b *testing.B) {
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charRange := "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890\"#/!\\$%&+-*.,?=()[]{}:;~^|"
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for i := 0; i < b.N; i++ {
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_, _ = random.GetChar(&charRange, 20)
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_, _ = random.GetChar(charRange, 20)
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}
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}
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@ -269,7 +269,7 @@ func BenchmarkConvertChar(b *testing.B) {
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cfgObj.HumanReadable = false
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charRange := chars.GetRange(&cfgObj)
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for i := 0; i < b.N; i++ {
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charToConv, _ := random.GetChar(&charRange, 1)
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charToConv, _ := random.GetChar(charRange, 1)
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charBytes := []byte(charToConv)
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_, _ = spelling.ConvertCharToName(charBytes[0])
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}
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@ -19,7 +19,7 @@ func main() {
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}
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pl := config.GetPwLengthFromParams(&c)
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cs := chars.GetRange(&c)
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pw, err := random.GetChar(&cs, pl)
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pw, err := random.GetChar(cs, pl)
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if err != nil {
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panic(err)
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}
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@ -2,28 +2,50 @@ package random
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import (
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"crypto/rand"
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"encoding/binary"
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"fmt"
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"math/big"
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"strings"
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)
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// Bitmask sizes for the string generators (based on 93 chars total)
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const (
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letterIdxBits = 7 // 7 bits to represent a letter index
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letterIdxMask = 1<<letterIdxBits - 1 // All 1-bits, as many as letterIdxBits
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letterIdxMax = 63 / letterIdxBits // # of letter indices fitting in 63 bits
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)
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// GetChar generates random characters based on given character range
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// and password length
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func GetChar(charRange *string, pwLength int) (string, error) {
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if pwLength <= 0 {
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err := fmt.Errorf("provided pwLength value is <= 0: %v", pwLength)
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return "", err
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func GetChar(cr string, l int) (string, error) {
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if l < 1 {
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return "", fmt.Errorf("length is negative")
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}
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availCharsLength := len(*charRange)
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charSlice := []byte(*charRange)
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returnString := make([]byte, pwLength)
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for i := 0; i < pwLength; i++ {
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randNum, err := GetNum(availCharsLength)
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if err != nil {
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return "", err
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rs := strings.Builder{}
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rs.Grow(l)
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crl := len(cr)
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rp := make([]byte, 8)
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_, err := rand.Read(rp)
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if err != nil {
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return rs.String(), err
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}
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for i, c, r := l-1, binary.BigEndian.Uint64(rp), letterIdxMax; i >= 0; {
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if r == 0 {
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_, err := rand.Read(rp)
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if err != nil {
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return rs.String(), err
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}
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c, r = binary.BigEndian.Uint64(rp), letterIdxMax
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}
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returnString[i] = charSlice[randNum]
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if idx := int(c & letterIdxMask); idx < crl {
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rs.WriteByte(cr[idx])
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i--
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}
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c >>= letterIdxBits
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r--
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}
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return string(returnString), nil
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return rs.String(), nil
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}
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// GetNum generates a random number with given maximum value
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