paillier

package module

v0.0.0-...-b14d9ba Latest Latest Go to latest Published: Dec 24, 2019 License: MIT Imports: 3 Imported by: 0

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Repository

github.com/Fishermanljh/paillier-1

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README ¶

Paillier

Homomorphic encryption using the Paillier cryptosystem implemented in Go

The following operations are supported

Addition of two encrypted integers
Subtraction of two encrypted integers
Addition of an encrypted and plaintext integer
Multiplication of an encrypted and plaintext integer
Division of an encrypted integer by a plaintext integer in cases where x mod y == 0

See int_test.go for example usage.

Documentation ¶

Index ¶

func NewKeyPair(keyLength, threshold int) (*PublicKey, *PrivateKey, error)
type Int
- func NewInt(publicKey *PublicKey, x *big.Int) *Int
type PrivateKey
type PublicKey

Constants ¶

This section is empty.

Variables ¶

This section is empty.

Functions ¶

func NewKeyPair ¶

func NewKeyPair(keyLength, threshold int) (*PublicKey, *PrivateKey, error)

NewKeyPair generates a new public and private key. The key length must be large enough to encrypt the message. The threshold should be greater than the maximum integer that will be encrypted.

Types ¶

type Int ¶

type Int struct {
	Cipher    *big.Int
	PublicKey *PublicKey
}

Int represents and encrypted integer using the Paillier cryptosystem. The public key used to encrypt the integer is also included. A notable feature of the Paillier cryptosystem is its homomorphic properties along with its non-deterministic encryption.

func NewInt ¶

func NewInt(publicKey *PublicKey, x *big.Int) *Int

NewInt returns the encryption of x using the given public key.

func (*Int) Add ¶

func (z *Int) Add(x, y *Int) *Int

Add sets z to the encrypted sum x+y and returns z. If x.PublicKey != y.PublicKey, a pubic-keys-not-equal run-time panic occurs.

func (*Int) AddPlaintext ¶

func (z *Int) AddPlaintext(x *Int, y *big.Int) *Int

AddPlaintext sets z to the encrypted sum x+y and returns z.

func (*Int) Decrypt ¶

func (z *Int) Decrypt(privateKey *PrivateKey) *big.Int

Decrypt returns the decrypted value of z using the given private key. If z.PublicKey != privateKey.PublicKey, a pubic-keys-not-equal run-time panic occurs.

func (*Int) DivPlaintext ¶

func (z *Int) DivPlaintext(x *Int, y *big.Int) *Int

DivPlaintext sets z to the encrypted quotient x/y and returns z. If y == 0, a division-by-zero run-time panic occurs. DivPlaintext will return an invalid result in cases where y does not divide x.

func (*Int) MulPlaintext ¶

func (z *Int) MulPlaintext(x *Int, y *big.Int) *Int

MulPlaintext sets z to the encrypted product x*y and returns z.

func (*Int) Sub ¶

func (z *Int) Sub(x, y *Int) *Int

Sub sets z to the encrypted difference x-y and returns z. If x.PublicKey != y.PublicKey, a pubic-keys-not-equal run-time panic occurs.

type PrivateKey ¶

type PrivateKey struct {
	Length    int
	PublicKey *PublicKey
	L         *big.Int
	U         *big.Int
	Threshold *big.Int
}

PrivateKey must be kept secret

type PublicKey ¶

type PublicKey struct {
	Length int
	N      *big.Int
	NSq    *big.Int
	G      *big.Int
}

PublicKey is the key that may be shared

Source Files ¶

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