Merge pull request #168 from devlights/add-bcrypt-example-#167

Add bcrypt package example

Author: devlights

advanced/crypto/bcrypt_password_hash.go

@@ -0,0 +1,65 @@
+package crypto
+
+import (
+	"github.com/devlights/try-golang/lib/output"
+	"golang.org/x/crypto/bcrypt"
+	"golang.org/x/crypto/ssh/terminal"
+	"syscall"
+)
+
+// BcryptPasswordHash は、 bcrypt パッケージを利用してパスワードのハッシュ化をしてみるサンプルです.
+// パスワードの読み取りには、 terminal パッケージの ReadPassword() を利用しています.
+//
+// REFERENCES::
+//   - https://medium.com/@jcox250/password-hash-salt-using-golang-b041dc94cb72
+//   - https://pkg.go.dev/golang.org/x/crypto/bcrypt?tab=doc
+//   - https://pkg.go.dev/golang.org/x/crypto/ssh/terminal?tab=doc
+//   - https://ja.wikipedia.org/wiki/Bcrypt
+//   - https://liginc.co.jp/377191
+//   - https://stackoverflow.com/questions/30363790/silence-user-input-in-scan-function
+func BcryptPasswordHash() error {
+
+	// パスワード読み取り
+	password, err := readPassword()
+	if err != nil {
+		return err
+	}
+
+	// bcrypt で ハッシュ化
+	hashedPassword, err := bcrypt.GenerateFromPassword(password, bcrypt.DefaultCost)
+	if err != nil {
+		return err
+	}
+
+	// ハッシュ化したものを文字列で表示
+	output.Stdoutl("Hashed Password: ", string(hashedPassword))
+
+	// 再度パスワード読み取り
+	password2, err := readPassword()
+	if err != nil {
+		return err
+	}
+
+	// 一致するかを bcrypt パッケージの関数で確認
+	err = bcrypt.CompareHashAndPassword(hashedPassword, password2)
+	if err != nil {
+		output.Stdoutl("CompareHashAndPassword", "一致しませんでした")
+	} else {
+		output.Stdoutl("CompareHashAndPassword", "一致しました")
+	}
+
+	return nil
+}
+
+func readPassword() ([]byte, error) {
+
+	output.Stdoutf("ENTER Password: ", "")
+
+	password, err := terminal.ReadPassword(int(syscall.Stdin))
+	if err != nil {
+		return nil, err
+	}
+	output.Stdoutl("", "")
+
+	return password, nil
+}

go.mod

@@ -7,4 +7,5 @@ require (
 	github.com/cheekybits/genny v1.0.0
 	github.com/deckarep/golang-set v1.7.1
 	github.com/getsentry/sentry-go v0.4.0
+	golang.org/x/crypto v0.0.0-20190701094942-4def268fd1a4
 )

go.sum

@@ -142,6 +142,7 @@ github.com/yudai/golcs v0.0.0-20170316035057-ecda9a501e82/go.mod h1:lgjkn3NuSvDf
 github.com/yudai/pp v2.0.1+incompatible/go.mod h1:PuxR/8QJ7cyCkFp/aUDS+JY727OFEZkTdatxwunjIkc=
 golang.org/x/crypto v0.0.0-20181203042331-505ab145d0a9/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20190701094942-4def268fd1a4 h1:HuIa8hRrWRSrqYzx1qI49NNxhdi2PrY7gxVSq1JjLDc=
 golang.org/x/crypto v0.0.0-20190701094942-4def268fd1a4/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20181220203305-927f97764cc3/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
@@ -158,6 +159,7 @@ golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5h
 golang.org/x/sys v0.0.0-20190222072716-a9d3bda3a223/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190626221950-04f50cda93cb/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a h1:aYOabOQFp6Vj6W1F80affTUvO9UxmJRx8K0gsfABByQ=
 golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/tools v0.0.0-20181221001348-537d06c36207/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=

lib/mapping.go

@@ -3,6 +3,7 @@ package lib
 import (
 	"github.com/devlights/try-golang/advanced/async"
 	"github.com/devlights/try-golang/advanced/closure"
+	"github.com/devlights/try-golang/advanced/crypto"
 	"github.com/devlights/try-golang/advanced/generate"
 	"github.com/devlights/try-golang/advanced/reflection"
 	"github.com/devlights/try-golang/advanced/sets"
@@ -147,6 +148,7 @@ func (m SampleMapping) MakeMapping() {
 	m["xdg_base_directory"] = xdgspec.XdgBaseDirectory
 	m["xdg_user_directory"] = xdgspec.XdgUserDirectory
 	m["xdg_file_operation"] = xdgspec.XdgFileOperation
+	m["crypto_bcrypt_password_hash"] = crypto.BcryptPasswordHash
 
 	m["tutorial_gotour_helloworld"] = tutorial.HelloWorld
 	m["tutorial_gotour_import"] = tutorial.Import