crypto

package
v0.1.3 Latest Latest
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 Go to latest Published: Dec 27, 2019 License: Apache-2.0 Imports: 28 Imported by: 0

Documentation

Overview

Ripemd160 

sum := crypto.Ripemd160([]byte("This is blockchain"))
fmt.Printf("%x\n", sum)

Index

Examples

Constants

View Source 
const PubKeyEd25519Size = 32
View Source 
const PubKeySecp256k1Size = 33
View Source 
const SignatureEd25519Size = 64
View Source 
const Version = "0.9.0-dev"

Variables

This section is empty.

Functions

func CRandBytes 

func CRandBytes(numBytes int) []byte

This uses the OS and the Seed(s).

func CRandHex 

func CRandHex(numDigits int) string

CRandHex returns a hex encoded string that's floor(numDigits/2) * 2 long.

Note: CRandHex(24) gives 96 bits of randomness that are usually strong enough for most purposes.

func CReader 

func CReader() io.Reader

Returns a crand.Reader mixed with user-supplied entropy

func CheckPriKey 

func CheckPriKey(pubKey, priKey string) (bool, error)

func CompressPubkey 

func CompressPubkey(pubkey *ecdsa.PublicKey) []byte

CompressPubkey encodes a public key to the 33-byte compressed format.

func CreateAddress 

func CreateAddress(b common.Address, nonce uint64, payload []byte) common.Address

CreateAddress creates an ethereum address given the bytes and the nonce

func CreateAddress2 

func CreateAddress2(b common.Address, salt [32]byte, inithash []byte) common.Address

CreateAddress2 creates an ethereum address given the address bytes, initial contract code hash and a salt.

func DecodeArmor 

func DecodeArmor(armorStr string) (blockType string, headers map[string]string, data []byte, err error)

func DecompressPubkey 

func DecompressPubkey(pubkey []byte) (*ecdsa.PublicKey, error)

DecompressPubkey parses a public key in the 33-byte compressed format.

func DecryptSymmetric 

func DecryptSymmetric(ciphertext []byte, secret []byte) (plaintext []byte, err error)

secret must be 32 bytes long. Use something like Sha256(Bcrypt(passphrase)) The ciphertext is (secretbox.Overhead + 24) bytes longer than the plaintext.

func Ecrecover 

func Ecrecover(hash, sig []byte) ([]byte, error)

Ecrecover returns the uncompressed public key that created the given signature.

func EncodeArmor 

func EncodeArmor(blockType string, headers map[string]string, data []byte) string

func EncryptSymmetric 

func EncryptSymmetric(plaintext []byte, secret []byte) (ciphertext []byte)

secret must be 32 bytes long. Use something like Sha256(Bcrypt(passphrase)) The ciphertext is (secretbox.Overhead + 24) bytes longer than the plaintext. NOTE: call crypto.MixEntropy() first.

func FromECDSA 

func FromECDSA(priv *ecdsa.PrivateKey) []byte

FromECDSA exports a private key into a binary dump.

func FromECDSAPub 

func FromECDSAPub(pub *ecdsa.PublicKey) []byte

func GenerateKey 

func GenerateKey() (*ecdsa.PrivateKey, error)

func HexToECDSA 

func HexToECDSA(hexkey string) (*ecdsa.PrivateKey, error)

HexToECDSA parses a secp256k1 private key.

func Keccak256 

func Keccak256(data ...[]byte) []byte

Keccak256 calculates and returns the Keccak256 hash of the input data.

func Keccak256Hash 

func Keccak256Hash(data ...[]byte) (h common.Hash)

Keccak256Hash calculates and returns the Keccak256 hash of the input data, converting it to an internal Hash data structure.

func Keccak512 

func Keccak512(data ...[]byte) []byte

Keccak512 calculates and returns the Keccak512 hash of the input data.

func LoadECDSA 

func LoadECDSA(file string) (*ecdsa.PrivateKey, error)

LoadECDSA loads a secp256k1 private key from the given file.

func MixEntropy 

func MixEntropy(seedBytes []byte)

Mix additional bytes of randomness, e.g. from hardware, user-input, etc. It is OK to call it multiple times. It does not diminish security.

func PubkeyToAddress 

func PubkeyToAddress(p ecdsa.PublicKey) common.Address

func RegisterAmino 

func RegisterAmino()

RegisterAmino registers all crypto related types in the given (amino) codec.

func Ripemd160 

func Ripemd160(bytes []byte) []byte
Example 
sum := Ripemd160([]byte("This is blockchain"))
fmt.Printf("%x\n", sum)

Output:

fe3a9bddf46bc0c7a304d9e46a1f1886cebcfc64

func S256 

func S256() elliptic.Curve

S256 returns an instance of the secp256k1 curve.

func SaveECDSA 

func SaveECDSA(file string, key *ecdsa.PrivateKey) error

SaveECDSA saves a secp256k1 private key to the given file with restrictive permissions. The key data is saved hex-encoded.

func Sha256 

func Sha256(bytes []byte) []byte
Example 
sum := Sha256([]byte("This is blockchain"))
fmt.Printf("%x\n", sum)

Output:

725e310f23c4ade6bbd2e042140ca3669b9a6db3d25681724ca139fcc91ca5f4

func SigToPub 

func SigToPub(hash, sig []byte) (*ecdsa.PublicKey, error)

SigToPub returns the public key that created the given signature.

func Sign 

func Sign(hash []byte, prv *ecdsa.PrivateKey) (sig []byte, err error)

Sign calculates an ECDSA signature.

This function is susceptible to chosen plaintext attacks that can leak information about the private key that is used for signing. Callers must be aware that the given hash cannot be chosen by an adversery. Common solution is to hash any input before calculating the signature.

The produced signature is in the [R || S || V] format where V is 0 or 1.

func ToECDSA 

func ToECDSA(d []byte) (*ecdsa.PrivateKey, error)

ToECDSA creates a private key with the given D value.

func ToECDSAUnsafe 

func ToECDSAUnsafe(d []byte) *ecdsa.PrivateKey

ToECDSAUnsafe blindly converts a binary blob to a private key. It should almost never be used unless you are sure the input is valid and want to avoid hitting errors due to bad origin encoding (0 prefixes cut off).

func UnmarshalPubkey 

func UnmarshalPubkey(pub []byte) (*ecdsa.PublicKey, error)

UnmarshalPubkey converts bytes to a secp256k1 public key.

func ValidateSignatureValues 

func ValidateSignatureValues(v byte, r, s *big.Int, homestead bool) bool

ValidateSignatureValues verifies whether the signature values are valid with the given chain rules. The v value is assumed to be either 0 or 1.

func VerifySignature 

func VerifySignature(pubkey, hash, signature []byte) bool

VerifySignature checks that the given public key created signature over hash. The public key should be in compressed (33 bytes) or uncompressed (65 bytes) format. The signature should have the 64 byte [R || S] format.

Types

type Address 

type Address = cmn.HexBytes

An address is a []byte, but hex-encoded even in JSON. []byte leaves us the option to change the address length. Use an alias so Unmarshal methods (with ptr receivers) are available too.

type PrivKey 

type PrivKey interface {
	Bytes() []byte
	Sign(msg []byte) (Signature, error)
	PubKey() PubKey
	Equals(PrivKey) bool
}

func HexToPrivkey 

func HexToPrivkey(priv string) (PrivKey, error)

func PrivKeyFromBytes 

func PrivKeyFromBytes(privKeyBytes []byte) (privKey PrivKey, err error)

type PrivKeyEd25519 

type PrivKeyEd25519 [64]byte

Implements PrivKey

func GenPrivKeyEd25519 

func GenPrivKeyEd25519() PrivKeyEd25519

func GenPrivKeyEd25519FromSecret 

func GenPrivKeyEd25519FromSecret(secret []byte) PrivKeyEd25519

NOTE: secret should be the output of a KDF like bcrypt, if it's derived from user input.

func (PrivKeyEd25519) Bytes 

func (privKey PrivKeyEd25519) Bytes() []byte

func (PrivKeyEd25519) Equals 

func (privKey PrivKeyEd25519) Equals(other PrivKey) bool

Equals - you probably don't need to use this. Runs in constant time based on length of the keys.

func (PrivKeyEd25519) Generate 

func (privKey PrivKeyEd25519) Generate(index int) PrivKeyEd25519

Deterministically generates new priv-key bytes from key.

func (PrivKeyEd25519) MarshalJSON 

func (privKey PrivKeyEd25519) MarshalJSON() ([]byte, error)

func (PrivKeyEd25519) PubKey 

func (privKey PrivKeyEd25519) PubKey() PubKey

func (PrivKeyEd25519) Sign 

func (privKey PrivKeyEd25519) Sign(msg []byte) (Signature, error)

func (*PrivKeyEd25519) UnmarshalJSON 

func (privKey *PrivKeyEd25519) UnmarshalJSON(input []byte) error

type PrivKeySecp256k1 

type PrivKeySecp256k1 [32]byte

Implements PrivKey

func GenPrivKeySecp256k1 

func GenPrivKeySecp256k1() PrivKeySecp256k1

func GenPrivKeySecp256k1FromSecret 

func GenPrivKeySecp256k1FromSecret(secret []byte) PrivKeySecp256k1

NOTE: secret should be the output of a KDF like bcrypt, if it's derived from user input.

func (PrivKeySecp256k1) Bytes 

func (privKey PrivKeySecp256k1) Bytes() []byte

func (PrivKeySecp256k1) Equals 

func (privKey PrivKeySecp256k1) Equals(other PrivKey) bool

Equals - you probably don't need to use this. Runs in constant time based on length of the keys.

func (PrivKeySecp256k1) PubKey 

func (privKey PrivKeySecp256k1) PubKey() PubKey

func (PrivKeySecp256k1) Sign 

func (privKey PrivKeySecp256k1) Sign(msg []byte) (Signature, error)

type PubKey 

type PubKey interface {
	Address() Address
	Bytes() []byte
	VerifyBytes(msg []byte, sig Signature) bool
	Equals(PubKey) bool
}

func HexToPubkey 

func HexToPubkey(pub string) (PubKey, error)

func PubKeyFromBytes 

func PubKeyFromBytes(pubKeyBytes []byte) (pubKey PubKey, err error)

type PubKeyEd25519 

type PubKeyEd25519 [PubKeyEd25519Size]byte

Implements PubKeyInner

func (PubKeyEd25519) Address 

func (pubKey PubKeyEd25519) Address() Address

Address is the Ripemd160 of the raw pubkey bytes.

func (PubKeyEd25519) Bytes 

func (pubKey PubKeyEd25519) Bytes() []byte

func (PubKeyEd25519) Equals 

func (pubKey PubKeyEd25519) Equals(other PubKey) bool

func (PubKeyEd25519) MarshalJSON 

func (pubKey PubKeyEd25519) MarshalJSON() ([]byte, error)

func (PubKeyEd25519) String 

func (pubKey PubKeyEd25519) String() string

func (*PubKeyEd25519) UnmarshalJSON 

func (pubKey *PubKeyEd25519) UnmarshalJSON(input []byte) error

func (PubKeyEd25519) VerifyBytes 

func (pubKey PubKeyEd25519) VerifyBytes(msg []byte, sig_ Signature) bool

type PubKeySecp256k1 

type PubKeySecp256k1 [PubKeySecp256k1Size]byte

Implements PubKey. Compressed pubkey (just the x-cord), prefixed with 0x02 or 0x03, depending on the y-cord.

func (PubKeySecp256k1) Address 

func (pubKey PubKeySecp256k1) Address() Address

Implements Bitcoin style addresses: RIPEMD160(SHA256(pubkey))

func (PubKeySecp256k1) Bytes 

func (pubKey PubKeySecp256k1) Bytes() []byte

func (PubKeySecp256k1) Equals 

func (pubKey PubKeySecp256k1) Equals(other PubKey) bool

func (PubKeySecp256k1) String 

func (pubKey PubKeySecp256k1) String() string

func (PubKeySecp256k1) VerifyBytes 

func (pubKey PubKeySecp256k1) VerifyBytes(msg []byte, sig_ Signature) bool

type Signature 

type Signature interface {
	Bytes() []byte
	IsZero() bool
	Equals(Signature) bool
}

func SignatureEd25519FromBytes 

func SignatureEd25519FromBytes(data []byte) Signature

func SignatureFromBytes 

func SignatureFromBytes(pubKeyBytes []byte) (pubKey Signature, err error)

func SignatureSecp256k1FromBytes 

func SignatureSecp256k1FromBytes(data []byte) Signature

type SignatureEd25519 

type SignatureEd25519 [SignatureEd25519Size]byte

Implements Signature

func (SignatureEd25519) Bytes 

func (sig SignatureEd25519) Bytes() []byte

func (SignatureEd25519) Equals 

func (sig SignatureEd25519) Equals(other Signature) bool

func (SignatureEd25519) IsZero 

func (sig SignatureEd25519) IsZero() bool

func (SignatureEd25519) String 

func (sig SignatureEd25519) String() string

type SignatureSecp256k1 

type SignatureSecp256k1 []byte

Implements Signature

func (SignatureSecp256k1) Bytes 

func (sig SignatureSecp256k1) Bytes() []byte

func (SignatureSecp256k1) Equals 

func (sig SignatureSecp256k1) Equals(other Signature) bool

func (SignatureSecp256k1) IsZero 

func (sig SignatureSecp256k1) IsZero() bool

func (SignatureSecp256k1) String 

func (sig SignatureSecp256k1) String() string

Source Files

View all Source files

Directories

Path Synopsis
Package bn256 implements the Optimal Ate pairing over a 256-bit Barreto-Naehrig curve.
 Package bn256 implements the Optimal Ate pairing over a 256-bit Barreto-Naehrig curve.
cloudflare
Package bn256 implements a particular bilinear group at the 128-bit security level.
 Package bn256 implements a particular bilinear group at the 128-bit security level.
google
Package bn256 implements a particular bilinear group.
 Package bn256 implements a particular bilinear group.
Package merkle computes a deterministic minimal height Merkle tree hash.
 Package merkle computes a deterministic minimal height Merkle tree hash.
Package secp256k1 wraps the bitcoin secp256k1 C library.
 Package secp256k1 wraps the bitcoin secp256k1 C library.

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