elgamal

package
v1.0.5006 Latest Latest
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 Go to latest Published: Dec 20, 2024 License: Apache-2.0 Imports: 15 Imported by: 0

Documentation

Index

Constants

This section is empty.

Variables

View Source 
var (

	// default is pkcs1 mode
	MarshalPublicKey = MarshalPKCS1PublicKey
	ParsePublicKey   = ParsePKCS1PublicKey

	MarshalPrivateKey = MarshalPKCS1PrivateKey
	ParsePrivateKey   = ParsePKCS1PrivateKey
)
View Source 
var ErrCipherLarge = errors.New("cryptobin/elgamal: cipher is larger than public key size")
View Source 
var ErrMessageLarge = errors.New("cryptobin/elgamal: message is larger than public key size")

Functions

func Decrypt 

func Decrypt(priv *PrivateKey, c1, c2 *big.Int) (msg []byte, err error)

Decrypt

func DecryptASN1 

func DecryptASN1(priv *PrivateKey, cipherData []byte) ([]byte, error)

Decrypt Asn1

func DecryptBytes added in v1.0.4020 

func DecryptBytes(priv *PrivateKey, cipherData []byte) ([]byte, error)

Decrypt bytes

func DecryptLegacy 

func DecryptLegacy(priv *PrivateKey, c1, c2 *big.Int) (msg []byte, err error)

DecryptLegacy

func Encrypt 

func Encrypt(random io.Reader, pub *PublicKey, msg []byte) (c1, c2 *big.Int, err error)

Encrypt

func EncryptASN1 

func EncryptASN1(random io.Reader, pub *PublicKey, message []byte) ([]byte, error)

Encrypt Asn1

func EncryptBytes added in v1.0.4020 

func EncryptBytes(random io.Reader, pub *PublicKey, message []byte) ([]byte, error)

Encrypt bytes

func EncryptLegacy 

func EncryptLegacy(random io.Reader, pub *PublicKey, msg []byte) (c1, c2 *big.Int, err error)

EncryptLegacy

func GeneratePQZp 

func GeneratePQZp(random io.Reader, n, probability int) (*big.Int, *big.Int, *big.Int, error)

Gen emit <p,q,g>. p = 2q + 1, p,q - safe primes g - cyclic group generator Zp performs n Miller-Rabin tests with 1 - 1/(4^n) probability false rate. Gain n - bit width for integer & probability rang for MR. It returns p, q, g and write error message.

func HommorphicEncMultiple 

func HommorphicEncMultiple(pub *PublicKey, ciphertext [][2][]byte) (*big.Int, *big.Int, error)

HommorphicEncMultiple performs homomorphic operation over multiple passed chiphers. Elgamal has multiplicative homomorphic property, so resultant cipher contains the product of multiple numbers.

func HomomorphicEncTwo 

func HomomorphicEncTwo(pub *PublicKey, c1, c2, c1dash, c2dash []byte) (*big.Int, *big.Int, error)

HomomorphicEncTwo performs homomorphic operation over two passed chiphers. Elgamal has multiplicative homomorphic property, so resultant cipher contains the product of two numbers.

func MarshalPKCS1PrivateKey 

func MarshalPKCS1PrivateKey(key *PrivateKey) ([]byte, error)

Marshal PKCS1 PrivateKey

func MarshalPKCS1PublicKey 

func MarshalPKCS1PublicKey(key *PublicKey) ([]byte, error)

Marshal PKCS1 PublicKey

func MarshalPKCS8PrivateKey 

func MarshalPKCS8PrivateKey(key *PrivateKey) ([]byte, error)

Marshal PKCS8 PrivateKey

func MarshalPKCS8PublicKey 

func MarshalPKCS8PublicKey(pub *PublicKey) ([]byte, error)

Marshal PKCS8 PublicKey

func MarshalXMLPrivateKey 

func MarshalXMLPrivateKey(key *PrivateKey) ([]byte, error)

func MarshalXMLPublicKey 

func MarshalXMLPublicKey(key *PublicKey) ([]byte, error)

func Sign 

func Sign(random io.Reader, priv *PrivateKey, hash []byte) (*big.Int, *big.Int, error)

Sign hash

func SignASN1 

func SignASN1(rand io.Reader, priv *PrivateKey, hash []byte) ([]byte, error)

SignASN1 signs a hash (which should be the result of hashing a larger message) using the private key, priv. If the hash is longer than the bit-length of the private key's curve order, the hash will be truncated to that length. It returns the ASN.1 encoded signature.

func SignBytes added in v1.0.4020 

func SignBytes(rand io.Reader, priv *PrivateKey, hash []byte) ([]byte, error)

签名返回 Bytes 编码数据 sign data and return Bytes marshal data

func Verify 

func Verify(pub *PublicKey, hash []byte, r, s *big.Int) (bool, error)

Verify hash

func VerifyASN1 

func VerifyASN1(pub *PublicKey, hash, sig []byte) (bool, error)

VerifyASN1 verifies the ASN.1 encoded signature, sig, of hash using the public key, pub. Its return value records whether the signature is valid.

func VerifyBytes added in v1.0.4020 

func VerifyBytes(pub *PublicKey, hash, sign []byte) (bool, error)

验证 asn.1 编码的数据 bytes(r + s) Verify Bytes marshal data

Types

type PKCS1Key 

type PKCS1Key struct{}

*

  • elgamal pkcs1 *
  • @create 2023-6-16
  • @author deatil

func NewPKCS1Key 

func NewPKCS1Key() PKCS1Key

NewPKCS1Key

func (PKCS1Key) MarshalPrivateKey 

func (this PKCS1Key) MarshalPrivateKey(key *PrivateKey) ([]byte, error)

Marshal PKCS1 PrivateKey

func (PKCS1Key) MarshalPublicKey 

func (this PKCS1Key) MarshalPublicKey(key *PublicKey) ([]byte, error)

Marshal PKCS1 PublicKey

func (PKCS1Key) ParsePrivateKey 

func (this PKCS1Key) ParsePrivateKey(der []byte) (*PrivateKey, error)

Parse PKCS1 PrivateKey

func (PKCS1Key) ParsePublicKey 

func (this PKCS1Key) ParsePublicKey(der []byte) (*PublicKey, error)

Parse PKCS1 PublicKey

type PKCS8Key 

type PKCS8Key struct{}

*

  • elgamal pkcs8 *
  • @create 2023-6-16
  • @author deatil

func NewPKCS8Key 

func NewPKCS8Key() PKCS8Key

NewPKCS8Key

func (PKCS8Key) MarshalPrivateKey 

func (this PKCS8Key) MarshalPrivateKey(key *PrivateKey) ([]byte, error)

Marshal PKCS8 PrivateKey

func (PKCS8Key) MarshalPublicKey 

func (this PKCS8Key) MarshalPublicKey(key *PublicKey) ([]byte, error)

Marshal PKCS8 PublicKey

func (PKCS8Key) ParsePrivateKey 

func (this PKCS8Key) ParsePrivateKey(der []byte) (key *PrivateKey, err error)

Parse PKCS8 PrivateKey

func (PKCS8Key) ParsePublicKey 

func (this PKCS8Key) ParsePublicKey(der []byte) (*PublicKey, error)

Parse PKCS8 PublicKey

type PrivateKey 

type PrivateKey struct {
	PublicKey
	X *big.Int
}

PrivateKey represents Elgamal private key.

func GenerateKey 

func GenerateKey(random io.Reader, bitsize, probability int) (*PrivateKey, error)

GenerateKey generates elgamal private key according to given bit size and probability. Moreover, the given probability value is used in choosing prime number P for performing n Miller-Rabin tests with 1 - 1/(4^n) probability false rate.

func ParsePKCS1PrivateKey 

func ParsePKCS1PrivateKey(derBytes []byte) (*PrivateKey, error)

Parse PKCS1 PrivateKey

func ParsePKCS8PrivateKey 

func ParsePKCS8PrivateKey(derBytes []byte) (key *PrivateKey, err error)

Parse PKCS8 PrivateKey

func ParseXMLPrivateKey 

func ParseXMLPrivateKey(der []byte) (*PrivateKey, error)

func (*PrivateKey) Decrypt 

func (priv *PrivateKey) Decrypt(random io.Reader, msg []byte, opts crypto.DecrypterOpts) (plaintext []byte, err error)

Decrypt decrypts the passed cipher text. It returns an error if cipher text value is larger than modulus P of Public key.

func (*PrivateKey) Equal 

func (priv *PrivateKey) Equal(x crypto.PrivateKey) bool

Equal reports whether priv and x have the same value.

func (*PrivateKey) Public 

func (priv *PrivateKey) Public() crypto.PublicKey

Public returns the public key corresponding to priv.

func (*PrivateKey) Sign 

func (priv *PrivateKey) Sign(random io.Reader, hash []byte, opts crypto.SignerOpts) (signature []byte, err error)

Signature generates signature over the given hash. It returns signature value consisting of two parts "r" and "s" as byte arrays.

type PublicKey 

type PublicKey struct {
	G, P, Y *big.Int
}

PublicKey represents a Elgamal public key.

func ParsePKCS1PublicKey 

func ParsePKCS1PublicKey(derBytes []byte) (*PublicKey, error)

Parse PKCS1 PublicKey

func ParsePKCS8PublicKey 

func ParsePKCS8PublicKey(derBytes []byte) (*PublicKey, error)

Parse PKCS8 PublicKey

func ParseXMLPublicKey 

func ParseXMLPublicKey(der []byte) (*PublicKey, error)

func (*PublicKey) Encrypt 

func (pub *PublicKey) Encrypt(random io.Reader, message []byte) ([]byte, error)

Encrypt encrypts a plain text represented as a byte array.

func (*PublicKey) Equal 

func (pub *PublicKey) Equal(x crypto.PublicKey) bool

Equal reports whether pub and x have the same value.

func (*PublicKey) Verify 

func (pub *PublicKey) Verify(hash, sig []byte) (bool, error)

Verify verifies signature over the given hash and signature values (r & s). It returns true as a boolean value if signature is verify correctly. Otherwise it returns false along with error message.

type XMLKey 

type XMLKey struct{}

*

  • elgamal xml密钥 *
  • @create 2023-6-16
  • @author deatil

func NewXMLKey 

func NewXMLKey() XMLKey

构造函数

func (XMLKey) MarshalPrivateKey 

func (this XMLKey) MarshalPrivateKey(key *PrivateKey) ([]byte, error)

包装私钥

func (XMLKey) MarshalPublicKey 

func (this XMLKey) MarshalPublicKey(key *PublicKey) ([]byte, error)

包装公钥

func (XMLKey) ParsePrivateKey 

func (this XMLKey) ParsePrivateKey(data []byte) (*PrivateKey, error)

解析私钥

func (XMLKey) ParsePublicKey 

func (this XMLKey) ParsePublicKey(data []byte) (*PublicKey, error)

解析公钥

Source Files

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