crypto

Documentation

Index

• Constants
• Variables
• func ChameleonHash(parameters *ChameleonHashParameters, checkString *ChameleonHashCheckString, ...) [32]byte
• func CreateRSAKeyFile(filename string) error
• func CreateRSAPrivKeyFromBase64(strModulus string, strPrivExponent string, strPrimes []string) (privKey *rsa.PrivateKey, err error)
• func CreateRSAPubKeyFromBytes(bytModulus [COMM_KEY_LENGTH]byte) (pubKey *rsa.PublicKey, err error)
• func ExtractECDSAKeyFromFile(filename string) (privKey *ecdsa.PrivateKey, err error)
• func ExtractRSAKeyFromFile(filename string) (privKey *rsa.PrivateKey, err error)
• func GetAddressFromPubKey(pubKey *ecdsa.PublicKey) (address [64]byte)
• func GetOrCreateECDSAPublicKeyFromFile(filename string) (pubKey *ecdsa.PublicKey, err error)
• func GetPrivKeyFromString(x, y, d string) (privateKey *ecdsa.PrivateKey, err error)
• func GetPubKeyFromString(x, y string) (pubKey *ecdsa.PublicKey, err error)
• func ReadFile(filename string) (lines []string)
• func SignMessageWithRSAKey(privKey *rsa.PrivateKey, msg string) (fixedSig [COMM_PROOF_LENGTH]byte, err error)
• func VerifyECDSAKey(privKey *ecdsa.PrivateKey) error
• func VerifyMessageWithRSAKey(pubKey *rsa.PublicKey, msg string, fixedSig [COMM_PROOF_LENGTH]byte) (err error)
• func VerifyRSAKey(privKey *rsa.PrivateKey) error
• type ChameleonHashCheckString
  • func GenerateChCollision(parameters *ChameleonHashParameters, checkString *ChameleonHashCheckString, ...) *ChameleonHashCheckString
  • func NewCheckString(parameters *ChameleonHashParameters) *ChameleonHashCheckString
• type ChameleonHashParameters
  • func GetOrCreateParametersFromFile(filename string) (parameters *ChameleonHashParameters, err error)
  • func GetParametersFromString(g, p, q, hk, tk string) (parameters *ChameleonHashParameters, err error)
  • func (parameters ChameleonHashParameters) String() string

Constants

const (
	// Note that this is the default public exponent set by Golang in rsa.go
	// See https://github.com/golang/go/blob/6269dcdc24d74379d8a609ce886149811020b2cc/src/crypto/rsa/rsa.go#L226
	COMM_PUBLIC_EXPONENT = 65537
	COMM_KEY_BITS        = 2048
	COMM_PROOF_LENGTH    = 256
	COMM_KEY_LENGTH      = 256
	COMM_NOF_PRIMES      = 2
)

const CH_PARAM_SIZE = 64

const CH_SIZE = 256 // Length of a single parameter in bytes.

const HEX_BASE = 16

Variables

var (
	ChameleonHashParametersMap = make(map[[32]byte]*ChameleonHashParameters)
)

Functions

func ChameleonHash

func ChameleonHash(parameters *ChameleonHashParameters, checkString *ChameleonHashCheckString, message *[]byte) [32]byte

Returns the chameleon hash form a set of chameleon hash parameters, a check string and a message to hash.

func CreateRSAKeyFile

func CreateRSAKeyFile(filename string) error

Creates an RSA key file with the following lines 1 Public Modulus N 2 Private Exponent D 3+ Private Primes (depending on COMM_NOF_PRIMES)

func CreateRSAPrivKeyFromBase64

func CreateRSAPrivKeyFromBase64(strModulus string, strPrivExponent string, strPrimes []string) (privKey *rsa.PrivateKey, err error)

func CreateRSAPubKeyFromBytes

func CreateRSAPubKeyFromBytes(bytModulus [COMM_KEY_LENGTH]byte) (pubKey *rsa.PublicKey, err error)

func ExtractECDSAKeyFromFile

func ExtractECDSAKeyFromFile(filename string) (privKey *ecdsa.PrivateKey, err error)

func ExtractRSAKeyFromFile

func ExtractRSAKeyFromFile(filename string) (privKey *rsa.PrivateKey, err error)

func GetAddressFromPubKey

func GetAddressFromPubKey(pubKey *ecdsa.PublicKey) (address [64]byte)

func GetOrCreateECDSAPublicKeyFromFile

func GetOrCreateECDSAPublicKeyFromFile(filename string) (pubKey *ecdsa.PublicKey, err error)

func GetPrivKeyFromString

func GetPrivKeyFromString(x, y, d string) (privateKey *ecdsa.PrivateKey, err error)

func GetPubKeyFromString

func GetPubKeyFromString(x, y string) (pubKey *ecdsa.PublicKey, err error)

func ReadFile

func ReadFile(filename string) (lines []string)

func SignMessageWithRSAKey

func SignMessageWithRSAKey(privKey *rsa.PrivateKey, msg string) (fixedSig [COMM_PROOF_LENGTH]byte, err error)

func VerifyECDSAKey

func VerifyECDSAKey(privKey *ecdsa.PrivateKey) error

func VerifyMessageWithRSAKey

func VerifyMessageWithRSAKey(pubKey *rsa.PublicKey, msg string, fixedSig [COMM_PROOF_LENGTH]byte) (err error)

func VerifyRSAKey

func VerifyRSAKey(privKey *rsa.PrivateKey) error

Types

type ChameleonHashCheckString

type ChameleonHashCheckString struct {
	R []byte
	S []byte
}

func GenerateChCollision

func GenerateChCollision(
	parameters *ChameleonHashParameters,
	checkString *ChameleonHashCheckString,
	oldMessage *[]byte,
	newMessage *[]byte,
) *ChameleonHashCheckString

Generates a hash collision for two different inputs (oldMessage, newMessage) and returns a new check string. ===== USAGE ===== newCheckString := GenerateChamHashCollision(params, oldCheckString, oldMessage, newMessage) ChameleonHash(params, oldCheckString, oldMessage) == ChameleonHash(params, newCheckString, newMessage)

func NewCheckString

func NewCheckString(parameters *ChameleonHashParameters) *ChameleonHashCheckString

Generates a new CheckString from the provided parameters.

type ChameleonHashParameters

type ChameleonHashParameters struct {
	G  []byte // Prime
	P  []byte // Prime
	Q  []byte // Prime
	HK []byte // Public Hash Key
	TK []byte // Secret Trapdoor Key. Never share this key with others.
}

func GetOrCreateParametersFromFile

func GetOrCreateParametersFromFile(filename string) (parameters *ChameleonHashParameters, err error)

Retrieve a set of chameleon hash parameters from file. Creates a new set of parameters if the file not exists.

func GetParametersFromString

func GetParametersFromString(g, p, q, hk, tk string) (parameters *ChameleonHashParameters, err error)

Get chameleon hash parameters from a set of hex strings

func (ChameleonHashParameters) String

func (parameters ChameleonHashParameters) String() string