bcrypt

Documentation

Overview

Package bcrypt implements Provos and Mazières's bcrypt adaptive hashing algorithm. See http://www.usenix.org/event/usenix99/provos/provos.pdf

Index

• Constants
• Variables
• func CompareHashAndPassword(hashedPassword, password []byte) error
• func GenerateFromPassword(password []byte, cost int) ([]byte, error)
• type HashVersionTooNewError
  • func (hv HashVersionTooNewError) Error() string
• type InvalidCostError
  • func (ic InvalidCostError) Error() string
• type InvalidHashPrefixError
  • func (ih InvalidHashPrefixError) Error() string

Constants

const (
	MinCost     int = 4  // the minimum allowable cost as passed in to GenerateFromPassword
	MaxCost     int = 31 // the maximum allowable cost as passed in to GenerateFromPassword
	DefaultCost int = 10 // the cost that will actually be set if a cost below MinCost is passed into GenerateFromPassword
)

Variables

var ErrHashTooShort = errors.New("crypto/bcrypt: hashedSecret too short to be a bcrypted password")

The error returned from CompareHashAndPassword when a hash is too short to be a bcrypt hash.

var ErrMismatchedHashAndPassword = errors.New("crypto/bcrypt: hashedPassword is not the hash of the given password")

The error returned from CompareHashAndPassword when a password and hash do not match.

Functions

func CompareHashAndPassword

func CompareHashAndPassword(hashedPassword, password []byte) error

CompareHashAndPassword compares a bcrypt hashed password with its possible plaintext equivalent. Note: Using bytes.Equal for this job is insecure. Returns nil on success, or an error on failure.

func GenerateFromPassword

func GenerateFromPassword(password []byte, cost int) ([]byte, error)

GenerateFromPassword returns the bcrypt hash of the password at the given cost. If the cost given is less than MinCost, the cost will be set to MinCost, instead. Use CompareHashAndPassword, as defined in this package, to compare the returned hashed password with its cleartext version.

Types

type HashVersionTooNewError

type HashVersionTooNewError byte

The error returned from CompareHashAndPassword when a hash was created with a bcrypt algorithm newer than this implementation.

func (HashVersionTooNewError) Error

func (hv HashVersionTooNewError) Error() string

type InvalidCostError

type InvalidCostError int

func (InvalidCostError) Error

func (ic InvalidCostError) Error() string

type InvalidHashPrefixError

type InvalidHashPrefixError byte

The error returned from CompareHashAndPassword when a hash starts with something other than '$'

func (InvalidHashPrefixError) Error

func (ih InvalidHashPrefixError) Error() string