Go bcrypt Hash Code Example (Online Runner)

Online calculator: use the site bcrypt text tool.

Note: This snippet requires locally installed dependencies and will not run in the online runner. Run it locally with: go mod init bcrypt-demo && go get golang.org/x/crypto/bcrypt && go run bcrypt_basic.go

Calculation method

Use golang.org/x/crypto/bcrypt to generate and verify bcrypt hashes with a configurable cost.

Implementation notes

• Package: golang.org/x/crypto/bcrypt.
• Implementation: GenerateFromPassword returns the full bcrypt hash string (including salt and cost).
• Notes: use a cost that balances security and performance; higher costs are slower.

Text hashing example

package main

import (
	"fmt"

	"golang.org/x/crypto/bcrypt"
)

func main() {
	hash, err := bcrypt.GenerateFromPassword([]byte("password"), 10)
	if err != nil {
		panic(err)
	}
	fmt.Println(string(hash))
}

Complete script (implementation + tests)

package main

import (
	"fmt"

	"golang.org/x/crypto/bcrypt"
)

func main() {
	password := "correct horse battery staple"
	cost := 12

	hash, err := bcrypt.GenerateFromPassword([]byte(password), cost)
	if err != nil {
		panic(err)
	}
	fmt.Println("bcrypt hash=", string(hash))

	if err := bcrypt.CompareHashAndPassword(hash, []byte(password)); err != nil {
		panic("password verification failed")
	}
	fmt.Println("bcrypt verification passed")
}