bcrypt golang

To use bcrypt in Go, you need to follow these steps:

  1. Import the bcrypt package: go import "golang.org/x/crypto/bcrypt" This line of code imports the bcrypt package from the golang.org/x/crypto module.

  2. Generate a hash from a password: go password := "myPassword123" hashedPassword, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost) if err != nil { // Handle error } This code generates a hash from the given password using the GenerateFromPassword function. The first argument is the password as a byte slice, and the second argument is the cost factor, which determines the computational cost of hashing.

  3. Compare a password with a hash: go password := "myPassword123" hash := []byte("$2a$10$5b5U8fOiQV6Ld7V5xOxU7eG2f3r4a5z6f7g8h9i0j1k2l3m4n5o6p7q") err := bcrypt.CompareHashAndPassword(hash, []byte(password)) if err == bcrypt.ErrMismatchedHashAndPassword { // Passwords don't match } else if err != nil { // Handle error } else { // Passwords match } This code compares a password with a hash using the CompareHashAndPassword function. The first argument is the hash as a byte slice, and the second argument is the password as a byte slice. The function returns an error if the passwords don't match.

  4. Additional considerations:

  5. The bcrypt.GenerateFromPassword function automatically generates a random salt and appends it to the hash, making it unique even for the same password.
  6. The bcrypt.DefaultCost constant sets the cost factor to a reasonable default value. You can adjust it based on your specific needs for performance and security.

By following these steps, you can easily use bcrypt in your Go application for password hashing and verification.