abe

package
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 Go to latest Published: May 5, 2020 License: AGPL-3.0 Imports: 14 Imported by: 0

Documentation

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func CheckPolicy 

func CheckPolicy(policy string, userattrsJson string) string

checks satisfiability of a policy

func Decode 

func Decode(x string) []byte

func Decrypt 

func Decrypt(ctJson string, userattrsJson string) string

decrypt a ciphertext the function requires the list of user attributes to use and the corresponding collection of userkey

func Encode 

func Encode(x []byte) string

func Encrypt 

func Encrypt(secret string, policy string, authpubsJson string) string

encrypt a secret according to a given policy the function requires the public keys of the authorities mentioned in the policy

func ExtractAttrsFromPolicy 

func ExtractAttrsFromPolicy(policy string) string

extracts attributes from policy string

func ExtractAuthsFromPolicy 

func ExtractAuthsFromPolicy(policy string) string

extracts authorities from a policy string

func ExtractPolicyFromCiphertext 

func ExtractPolicyFromCiphertext(ctJson string) string

extracts policy embedded in a ciphertext

func ExtractVarsFromUserAttrs 

func ExtractVarsFromUserAttrs(userattrsJson string) map[string]int

func GetCurve 

func GetCurve(curveStr string) string

func JsonObj2Str 

func JsonObj2Str(x interface{}) string

func NewRandomAuth 

func NewRandomAuth(orgJson string) string

new random authority

func NewRandomOrg 

func NewRandomOrg(lib string, curveJson string) string

new random organization

func NewRandomSecret 

func NewRandomSecret(orgJson string, seed string) string

new random secret

func NewRandomUserkey 

func NewRandomUserkey(user string, attr string, authprvJson string) string

new random userkey

func RewritePolicy 

func RewritePolicy(policy string) string

rewrites a policy in a simplified form

func SelectUserAttrs 

func SelectUserAttrs(user string, policy string, userattrsJson string) string

select user attrs relevant for a given policy string

func SolvePolicy 

func SolvePolicy(policy string, userattrsJson string) map[string]int

solves a policy

Types

type AuthKeys 

type AuthKeys struct {
	AuthPub string `json:"authpub"` // public key of the authority
	AuthPrv string `json:"authprv"` // private key of the authority
}

authority public and private keys

type AuthPrv 

type AuthPrv struct {
	Org string `json:"org"`

	Alpha string `json:"alpha"`

	Y string `json:"y"`
	// contains filtered or unexported fields
}

authority private params

func (*AuthPrv) Decode 

func (authprv *AuthPrv) Decode() *AuthPrv

AuthPrv type from its json representation

func (*AuthPrv) Encode 

func (authprv *AuthPrv) Encode() *AuthPrv

AuthPrv type to its json representation

type AuthPub 

type AuthPub struct {
	Org string `json:"org"`

	Ealpha string `json:"ealpha"`

	G1y string `json:"g1y"`
	// contains filtered or unexported fields
}

authority public params

func (*AuthPub) Decode 

func (authpub *AuthPub) Decode() *AuthPub

AuthPub type from its json representation

func (*AuthPub) Encode 

func (authpub *AuthPub) Encode() *AuthPub

AuthPub type to its json representation

type AuthPubs 

type AuthPubs struct {
	AuthPub map[string]string `json:"authpub"` // authority -> corresponding public key
}

map of authorities public keys

type Ciphertext 

type Ciphertext struct {
	Org string `json:"org"`

	Policy string `json:"policy"`

	C0 string `json:"C0"`

	C map[string][][]string `json:"C"`
	// contains filtered or unexported fields
}

ciphertext encrypting the msg

func (*Ciphertext) Decode 

func (ct *Ciphertext) Decode() *Ciphertext

Ciphertext type from its json representation

func (*Ciphertext) Encode 

func (ct *Ciphertext) Encode() *Ciphertext

Ciphertext type to its json representation

type Curve 

type Curve interface {
	Encode() Curve
	Decode() Curve
	NewPointOn(group string) Point
	NewRandomExp() *big.Int
	NewRandomSecret(n int, zerosecret bool) []*big.Int
	NewRandomPointOn(group string) Point
	UnitOnGroup(group string) Point
	HashToGroup(x string, group string) Point
	HashToPow(x string, g Point) Point
	Inv(g1 Point) Point
	Mul(g1 Point, g2 Point) Point
	Div(g1 Point, g2 Point) Point
	Pow(g1 Point, e1 *big.Int) Point
	Pow2(g1 Point, e1 *big.Int, g2 Point, e2 *big.Int) Point
	Pow3(g1 Point, e1 *big.Int, g2 Point, e2 *big.Int, g3 Point, e3 *big.Int) Point
	Pair(g1 Point, g2 Point) Point
	ProdPair(g1 []Point, g2 []Point) Point
	// contains filtered or unexported methods
}

curve interface

type Org 

type Org struct {
	Lib string `json:"lib"`

	Curve string `json:"curve"`

	G1 string `json:"g1"`

	G2 string `json:"g2"`

	E string `json:"e"`
	// contains filtered or unexported fields
}

organization

func (*Org) Decode 

func (org *Org) Decode() *Org

Org type from its json representation

func (*Org) Encode 

func (org *Org) Encode() *Org

Org type to its json representation

type PbcCurve 

type PbcCurve struct {
	Params    string `json:"params"`
	Maxrndexp string `json:"maxrndexp"`
	// contains filtered or unexported fields
}

curve on pbc library

func (*PbcCurve) Decode 

func (curve *PbcCurve) Decode() Curve

PbcCurve type from its json representation

func (*PbcCurve) Div 

func (curve *PbcCurve) Div(g1 Point, g2 Point) Point

group operation

func (*PbcCurve) Encode 

func (curve *PbcCurve) Encode() Curve

PbcCurve type to its json representation

func (*PbcCurve) HashToGroup 

func (curve *PbcCurve) HashToGroup(x string, group string) Point

hash to group ("G1", "G2", "GT") in the bilinear pairing

func (*PbcCurve) HashToPow 

func (curve *PbcCurve) HashToPow(x string, g Point) Point

hash to group ("G1", "G2", "GT") in the bilinear pairing

func (*PbcCurve) Inv 

func (curve *PbcCurve) Inv(g1 Point) Point

group operation

func (*PbcCurve) Mul 

func (curve *PbcCurve) Mul(g1 Point, g2 Point) Point

group operation

func (*PbcCurve) NewPointOn 

func (curve *PbcCurve) NewPointOn(group string) Point

new point instance on a curve

func (*PbcCurve) NewRandomExp 

func (curve *PbcCurve) NewRandomExp() *big.Int

new random exponent

func (*PbcCurve) NewRandomPointOn 

func (curve *PbcCurve) NewRandomPointOn(group string) Point

new random point on a group ("G1", "G2", "GT") in the bilinear pairing

func (*PbcCurve) NewRandomSecret 

func (curve *PbcCurve) NewRandomSecret(n int, zerosecret bool) []*big.Int

new random secret vector of length n if zerosecret is true, the first component of the vector is zero

func (*PbcCurve) Pair 

func (curve *PbcCurve) Pair(g1 Point, g2 Point) Point

pairing

func (*PbcCurve) Pow 

func (curve *PbcCurve) Pow(g1 Point, e1 *big.Int) Point

group operation

func (*PbcCurve) Pow2 

func (curve *PbcCurve) Pow2(g1 Point, e1 *big.Int, g2 Point, e2 *big.Int) Point

group operation

func (*PbcCurve) Pow3 

func (curve *PbcCurve) Pow3(g1 Point, e1 *big.Int, g2 Point, e2 *big.Int, g3 Point, e3 *big.Int) Point

group operation

func (*PbcCurve) ProdPair 

func (curve *PbcCurve) ProdPair(g1 []Point, g2 []Point) Point

pairing

func (*PbcCurve) UnitOnGroup 

func (curve *PbcCurve) UnitOnGroup(group string) Point

unit on group ("G1", "G2", "GT") in the bilinear pairing

type PbcPoint 

type PbcPoint struct {
	P     string `json:"p"`
	Group string `json:"group"`
	// contains filtered or unexported fields
}

point on pbc library

func (*PbcPoint) Decode 

func (p *PbcPoint) Decode(curve Curve) Point

PbcPoint type from its json representation

func (*PbcPoint) Encode 

func (p *PbcPoint) Encode() Point

PbcPoint type to its json representation

func (*PbcPoint) GetGroup 

func (p *PbcPoint) GetGroup() string

func (*PbcPoint) GetP 

func (p *PbcPoint) GetP() string

type Point 

type Point interface {
	Encode() Point
	Decode(curve Curve) Point
	GetP() string
	GetGroup() string
	// contains filtered or unexported methods
}

point interface

type PolicyAttrs 

type PolicyAttrs struct {
	Row map[string][]int `json:"row"` // attribute -> access policy matrix rows index
}

attributes in a given policy

type UserAttrs 

type UserAttrs struct {
	User    string            `json:"user"`    // user
	Coeff   map[string][]int  `json:"coeff"`   // attribute -> its coefficients
	Userkey map[string]string `json:"userkey"` // attribute -> corresponding userkey
}

map of user attributes

type Userkey 

type Userkey struct {
	Org string `json:"org"`

	K string `json:"K"`

	KP string `json:"KP"`
	// contains filtered or unexported fields
}

user key

func (*Userkey) Decode 

func (userkey *Userkey) Decode() *Userkey

Userkey type from its json representation

func (*Userkey) Encode 

func (userkey *Userkey) Encode() *Userkey

Userkey type to its json representation

Source Files

View all Source files

Directories

Path Synopsis
+build linux
 +build linux
+build cgo
 +build cgo

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