types

package module
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 Go to latest Published: Jan 25, 2024 License: Apache-2.0 Imports: 5 Imported by: 10

Documentation

Overview

Copyright IBM Corp. All Rights Reserved.

SPDX-License-Identifier: Apache-2.0

Copyright IBM Corp. All Rights Reserved.

SPDX-License-Identifier: Apache-2.0

Copyright IBM Corp. All Rights Reserved.

SPDX-License-Identifier: Apache-2.0

Index

Constants

View Source 
const (
	// IDEMIX constant to identify Idemix related algorithms
	IDEMIX = "IDEMIX"
)

Variables

This section is empty.

Functions

This section is empty.

Types

type AttrNymAuditData 

type AttrNymAuditData struct {
	// Nym is the commitment to an attribute
	Nym *math.G1

	// RAttrNym is the randomness used to generate the Attr Nym
	Rand *math.Zr

	// Attr is the attribute (enrollment id or revocation handle)
	Attr *math.Zr
}

AttrNymAuditData contains the data that is used to audit a commitment to an auditable attribute. Nym is a commitment to the Attr. Attr can be an Enrollment ID or a Revocation Handle. Notice that this data should be used only after validating the corresponding signature.

type AuditVerificationType 

type AuditVerificationType int

AuditVerificationType describes the type of audit verification that is required 

const (
	// AuditExpectSignature performs the audit verification against a signature
	AuditExpectSignature AuditVerificationType = iota
	// AuditExpectEidNym performs the audit verification against an EID pseudonym
	AuditExpectEidNym
	// AuditExpectEidNymRhNym performs the audit verification against an EID pseudonym and a Revocation Handle pseudonym
	AuditExpectEidNymRhNym
)

type BCCSP 

type BCCSP interface {

	// KeyGen generates a key using opts.
	KeyGen(opts KeyGenOpts) (k Key, err error)

	// KeyDeriv derives a key from k using opts.
	// The opts argument should be appropriate for the primitive used.
	KeyDeriv(k Key, opts KeyDerivOpts) (dk Key, err error)

	// KeyImport imports a key from its raw representation using opts.
	// The opts argument should be appropriate for the primitive used.
	KeyImport(raw interface{}, opts KeyImportOpts) (k Key, err error)

	// GetKey returns the key this CSP associates to
	// the Subject Key Identifier ski.
	GetKey(ski []byte) (k Key, err error)

	// Hash hashes messages msg using options opts.
	// If opts is nil, the default hash function will be used.
	Hash(msg []byte, opts HashOpts) (hash []byte, err error)

	// GetHash returns and instance of hash.Hash using options opts.
	// If opts is nil, the default hash function will be returned.
	GetHash(opts HashOpts) (h hash.Hash, err error)

	// Sign signs digest using key k.
	// The opts argument should be appropriate for the algorithm used.
	//
	// Note that when a signature of a hash of a larger message is needed,
	// the caller is responsible for hashing the larger message and passing
	// the hash (as digest).
	Sign(k Key, digest []byte, opts SignerOpts) (signature []byte, err error)

	// Verify verifies signature against key k and digest
	// The opts argument should be appropriate for the algorithm used.
	Verify(k Key, signature, digest []byte, opts SignerOpts) (valid bool, err error)

	// Encrypt encrypts plaintext using key k.
	// The opts argument should be appropriate for the algorithm used.
	Encrypt(k Key, plaintext []byte, opts EncrypterOpts) (ciphertext []byte, err error)

	// Decrypt decrypts ciphertext using key k.
	// The opts argument should be appropriate for the algorithm used.
	Decrypt(k Key, ciphertext []byte, opts DecrypterOpts) (plaintext []byte, err error)
}

BCCSP is the blockchain cryptographic service provider that offers the implementation of cryptographic standards and algorithms.

type BlindCredRequest 

type BlindCredRequest interface {
	// Blind creates a request to sign the value sk
	Blind(sk *math.Zr, ipk IssuerPublicKey, nonce []byte) ([]byte, []byte, error)

	// Verify verifies the credential request
	BlindVerify(credRequest []byte, ipk IssuerPublicKey, nonce []byte) error

	// Unblind takes a blinded signature and a blinding and produces a standard signature
	Unblind(signature, blinding []byte) ([]byte, error)
}

BlindCredRequest is similar to CredRequest except it provides a hiding commitment to the hidden attribute (the user secret key), and so it requires an additional `Unblind` function to account for the randomness

type CredRequest 

type CredRequest interface {
	// Sign creates a new Credential Request, the first message of the interactive credential issuance protocol
	// (from user to issuer)
	Sign(sk *math.Zr, ipk IssuerPublicKey, nonce []byte) ([]byte, error)

	// Verify verifies the credential request
	Verify(credRequest []byte, ipk IssuerPublicKey, nonce []byte) error
}

CredRequest is a local interface to decouple from the idemix implementation of the issuance of credential requests.

type Credential 

type Credential interface {

	// Sign issues a new credential, which is the last step of the interactive issuance protocol
	// All attribute values are added by the issuer at this step and then signed together with a commitment to
	// the user's secret key from a credential request
	Sign(key IssuerSecretKey, credentialRequest []byte, attributes []IdemixAttribute) ([]byte, error)

	// Verify cryptographically verifies the credential by verifying the signature
	// on the attribute values and user's secret key
	Verify(sk *math.Zr, ipk IssuerPublicKey, credential []byte, attributes []IdemixAttribute) error
}

CredRequest is a local interface to decouple from the idemix implementation of the issuance of credentials.

type DecrypterOpts 

type DecrypterOpts interface{}

DecrypterOpts contains options for decrypting with a CSP.

type EidNymAuditOpts 

type EidNymAuditOpts struct {
	AuditVerificationType AuditVerificationType
	EidIndex              int      // Index of enrollment ID attribute in signature
	EnrollmentID          string   // Enrollment ID of identity
	RNymEid               *math.Zr // Field element of randomness
}

EidNymAuditOpts contains audit options for pseudonymous enrollment id

func (*EidNymAuditOpts) HashFunc 

func (o *EidNymAuditOpts) HashFunc() crypto.Hash

type EncrypterOpts 

type EncrypterOpts interface{}

EncrypterOpts contains options for encrypting with a CSP.

type HashOpts 

type HashOpts interface {

	// Algorithm returns the hash algorithm identifier (to be used).
	Algorithm() string
}

HashOpts contains options for hashing with a CSP.

type IdemixAttribute 

type IdemixAttribute struct {
	// Type is the attribute's type
	Type IdemixAttributeType
	// Value is the attribute's value
	Value interface{}
}

type IdemixAttributeType 

type IdemixAttributeType int

IdemixAttributeType represents the type of an idemix attribute 

const (
	// IdemixHiddenAttribute represents an hidden attribute
	IdemixHiddenAttribute IdemixAttributeType = iota
	// IdemixStringAttribute represents a sequence of bytes
	IdemixBytesAttribute
	// IdemixIntAttribute represents an int
	IdemixIntAttribute
)

type IdemixBlindCredentialRequestSignerOpts 

type IdemixBlindCredentialRequestSignerOpts struct {
	// Attributes contains a list of indices of the attributes to be included in the
	// credential. The indices are with the respect to IdemixIssuerKeyGenOpts#AttributeNames.
	Attributes []int
	// IssuerPK is the public-key of the issuer
	IssuerPK Key
	// IssuerNonce is generated by the issuer and used by the client to generate the credential request.
	// Once the issuer gets the credential requests, it checks that the nonce is the same.
	IssuerNonce []byte
	// HashFun is the hash function to be used
	H crypto.Hash

	// Blinding contains the blinding used to mask the unrevealed attributes
	Blinding []byte
}

IdemixCredentialRequestSignerOpts contains the option to create a Idemix credential request.

func (*IdemixBlindCredentialRequestSignerOpts) HashFunc 

func (o *IdemixBlindCredentialRequestSignerOpts) HashFunc() crypto.Hash

type IdemixCRISignerOpts 

type IdemixCRISignerOpts struct {
	Epoch               int
	RevocationAlgorithm RevocationAlgorithm
	UnrevokedHandles    [][]byte
	// H is the hash function to be used
	H crypto.Hash
}

IdemixCRISignerOpts contains the options to generate an Idemix CRI. The CRI is supposed to be generated by the Issuing authority and can be verified publicly by using the revocation public key.

func (*IdemixCRISignerOpts) HashFunc 

func (o *IdemixCRISignerOpts) HashFunc() crypto.Hash

type IdemixCredentialRequestSignerOpts 

type IdemixCredentialRequestSignerOpts struct {
	// Attributes contains a list of indices of the attributes to be included in the
	// credential. The indices are with the respect to IdemixIssuerKeyGenOpts#AttributeNames.
	Attributes []int
	// IssuerPK is the public-key of the issuer
	IssuerPK Key
	// IssuerNonce is generated by the issuer and used by the client to generate the credential request.
	// Once the issuer gets the credential requests, it checks that the nonce is the same.
	IssuerNonce []byte
	// HashFun is the hash function to be used
	H crypto.Hash
}

IdemixCredentialRequestSignerOpts contains the option to create a Idemix credential request.

func (*IdemixCredentialRequestSignerOpts) HashFunc 

func (o *IdemixCredentialRequestSignerOpts) HashFunc() crypto.Hash

func (*IdemixCredentialRequestSignerOpts) IssuerPublicKey 

func (o *IdemixCredentialRequestSignerOpts) IssuerPublicKey() Key

IssuerPublicKey returns the issuer public key used to derive a new unlinkable pseudonym from a credential secret key

type IdemixCredentialSignerOpts 

type IdemixCredentialSignerOpts struct {
	// Attributes to include in the credentials. IdemixHiddenAttribute is not allowed here
	Attributes []IdemixAttribute
	// IssuerPK is the public-key of the issuer
	IssuerPK Key
	// HashFun is the hash function to be used
	H crypto.Hash
}

IdemixCredentialSignerOpts contains the options to produce a credential starting from a credential request

func (*IdemixCredentialSignerOpts) HashFunc 

func (o *IdemixCredentialSignerOpts) HashFunc() crypto.Hash

HashFunc returns an identifier for the hash function used to produce the message passed to Signer.Sign, or else zero to indicate that no hashing was done.

func (*IdemixCredentialSignerOpts) IssuerPublicKey 

func (o *IdemixCredentialSignerOpts) IssuerPublicKey() Key

type IdemixIIssuerPublicKeyImporterErrorType 

type IdemixIIssuerPublicKeyImporterErrorType int
const (
	IdemixIssuerPublicKeyImporterUnmarshallingError IdemixIIssuerPublicKeyImporterErrorType = iota
	IdemixIssuerPublicKeyImporterHashError
	IdemixIssuerPublicKeyImporterValidationError
	IdemixIssuerPublicKeyImporterNumAttributesError
	IdemixIssuerPublicKeyImporterAttributeNameError
)

type IdemixIssuerKeyGenOpts 

type IdemixIssuerKeyGenOpts struct {
	// Temporary tells if the key is ephemeral
	Temporary bool
	// AttributeNames is a list of attributes
	AttributeNames []string
}

IdemixIssuerKeyGenOpts contains the options for the Idemix Issuer key-generation. A list of attribytes may be optionally passed

func (*IdemixIssuerKeyGenOpts) Algorithm 

func (*IdemixIssuerKeyGenOpts) Algorithm() string

Algorithm returns the key generation algorithm identifier (to be used).

func (*IdemixIssuerKeyGenOpts) Ephemeral 

func (o *IdemixIssuerKeyGenOpts) Ephemeral() bool

Ephemeral returns true if the key to generate has to be ephemeral, false otherwise.

type IdemixIssuerKeyImportOpts 

type IdemixIssuerKeyImportOpts struct {
	Temporary bool
	// AttributeNames is a list of attributes to ensure the import public key has
	AttributeNames []string
}

IdemixIssuerKeyImportOpts contains the options for importing of an Idemix issuer public key.

func (*IdemixIssuerKeyImportOpts) Algorithm 

func (*IdemixIssuerKeyImportOpts) Algorithm() string

Algorithm returns the key generation algorithm identifier (to be used).

func (*IdemixIssuerKeyImportOpts) Ephemeral 

func (o *IdemixIssuerKeyImportOpts) Ephemeral() bool

Ephemeral returns true if the key to generate has to be ephemeral, false otherwise.

type IdemixIssuerPublicKeyImportOpts 

type IdemixIssuerPublicKeyImportOpts struct {
	Temporary bool
	// AttributeNames is a list of attributes to ensure the import public key has
	AttributeNames []string
}

IdemixIssuerPublicKeyImportOpts contains the options for importing of an Idemix issuer public key.

func (*IdemixIssuerPublicKeyImportOpts) Algorithm 

func (*IdemixIssuerPublicKeyImportOpts) Algorithm() string

Algorithm returns the key generation algorithm identifier (to be used).

func (*IdemixIssuerPublicKeyImportOpts) Ephemeral 

func (o *IdemixIssuerPublicKeyImportOpts) Ephemeral() bool

Ephemeral returns true if the key to generate has to be ephemeral, false otherwise.

type IdemixIssuerPublicKeyImporterError 

type IdemixIssuerPublicKeyImporterError struct {
	Type     IdemixIIssuerPublicKeyImporterErrorType
	ErrorMsg string
	Cause    error
}

func (*IdemixIssuerPublicKeyImporterError) Error 

func (r *IdemixIssuerPublicKeyImporterError) Error() string

type IdemixNymKeyDerivationOpts 

type IdemixNymKeyDerivationOpts struct {
	// Temporary tells if the key is ephemeral
	Temporary bool
	// IssuerPK is the public-key of the issuer
	IssuerPK Key
}

IdemixNymKeyDerivationOpts contains the options to create a new unlinkable pseudonym from a credential secret key with the respect to the specified issuer public key

func (*IdemixNymKeyDerivationOpts) Algorithm 

func (*IdemixNymKeyDerivationOpts) Algorithm() string

Algorithm returns the key derivation algorithm identifier (to be used).

func (*IdemixNymKeyDerivationOpts) Ephemeral 

func (o *IdemixNymKeyDerivationOpts) Ephemeral() bool

Ephemeral returns true if the key to derive has to be ephemeral, false otherwise.

func (*IdemixNymKeyDerivationOpts) IssuerPublicKey 

func (o *IdemixNymKeyDerivationOpts) IssuerPublicKey() Key

IssuerPublicKey returns the issuer public key used to derive a new unlinkable pseudonym from a credential secret key

type IdemixNymKeyImportOpts 

type IdemixNymKeyImportOpts struct {
	// Temporary tells if the key is ephemeral
	Temporary bool
}

IdemixNymKeyImportOpts contains the options to import a pseudonym

func (*IdemixNymKeyImportOpts) Algorithm 

func (*IdemixNymKeyImportOpts) Algorithm() string

Algorithm returns the key derivation algorithm identifier (to be used).

func (*IdemixNymKeyImportOpts) Ephemeral 

func (o *IdemixNymKeyImportOpts) Ephemeral() bool

Ephemeral returns true if the key to derive has to be ephemeral, false otherwise.

type IdemixNymPublicKeyImportOpts 

type IdemixNymPublicKeyImportOpts struct {
	// Temporary tells if the key is ephemeral
	Temporary bool
}

IdemixNymPublicKeyImportOpts contains the options to import the public part of a pseudonym

func (*IdemixNymPublicKeyImportOpts) Algorithm 

func (*IdemixNymPublicKeyImportOpts) Algorithm() string

Algorithm returns the key derivation algorithm identifier (to be used).

func (*IdemixNymPublicKeyImportOpts) Ephemeral 

func (o *IdemixNymPublicKeyImportOpts) Ephemeral() bool

Ephemeral returns true if the key to derive has to be ephemeral, false otherwise.

type IdemixNymSignerOpts 

type IdemixNymSignerOpts struct {
	// Nym is the pseudonym to be used
	Nym Key
	// IssuerPK is the public-key of the issuer
	IssuerPK Key
	// H is the hash function to be used
	H crypto.Hash
}

IdemixNymSignerOpts contains the options to generate an idemix pseudonym signature.

func (*IdemixNymSignerOpts) HashFunc 

func (o *IdemixNymSignerOpts) HashFunc() crypto.Hash

HashFunc returns an identifier for the hash function used to produce the message passed to Signer.Sign, or else zero to indicate that no hashing was done.

type IdemixRevocationKeyGenOpts 

type IdemixRevocationKeyGenOpts struct {
	// Temporary tells if the key is ephemeral
	Temporary bool
}

IdemixRevocationKeyGenOpts contains the options for the Idemix revocation key-generation.

func (*IdemixRevocationKeyGenOpts) Algorithm 

func (*IdemixRevocationKeyGenOpts) Algorithm() string

Algorithm returns the key generation algorithm identifier (to be used).

func (*IdemixRevocationKeyGenOpts) Ephemeral 

func (o *IdemixRevocationKeyGenOpts) Ephemeral() bool

Ephemeral returns true if the key to generate has to be ephemeral, false otherwise.

type IdemixRevocationKeyImportOpts 

type IdemixRevocationKeyImportOpts struct {
	Temporary bool
}

IdemixRevocationKeyImportOpts contains the options for importing of an Idemix revocation key pair.

func (*IdemixRevocationKeyImportOpts) Algorithm 

func (*IdemixRevocationKeyImportOpts) Algorithm() string

Algorithm returns the key generation algorithm identifier (to be used).

func (*IdemixRevocationKeyImportOpts) Ephemeral 

func (o *IdemixRevocationKeyImportOpts) Ephemeral() bool

Ephemeral returns true if the key to generate has to be ephemeral, false otherwise.

type IdemixRevocationPublicKeyImportOpts 

type IdemixRevocationPublicKeyImportOpts struct {
	Temporary bool
}

IdemixRevocationPublicKeyImportOpts contains the options for importing of an Idemix revocation public key.

func (*IdemixRevocationPublicKeyImportOpts) Algorithm 

func (*IdemixRevocationPublicKeyImportOpts) Algorithm() string

Algorithm returns the key generation algorithm identifier (to be used).

func (*IdemixRevocationPublicKeyImportOpts) Ephemeral 

func (o *IdemixRevocationPublicKeyImportOpts) Ephemeral() bool

Ephemeral returns true if the key to generate has to be ephemeral, false otherwise.

type IdemixSignerMetadata 

type IdemixSignerMetadata struct {
	EidNym          []byte
	EidNymAuditData *AttrNymAuditData
	RhNym           []byte
	RhNymAuditData  *AttrNymAuditData
}

type IdemixSignerOpts 

type IdemixSignerOpts struct {
	// Nym is the pseudonym to be used
	Nym Key
	// IssuerPK is the public-key of the issuer
	IssuerPK Key
	// Credential is the byte representation of the credential signed by the issuer
	Credential []byte
	// Attributes specifies which attribute should be disclosed and which not.
	// If Attributes[i].Type = IdemixHiddenAttribute
	// then the i-th credential attribute should not be disclosed, otherwise the i-th
	// credential attribute will be disclosed.
	// At verification time, if the i-th attribute is disclosed (Attributes[i].Type != IdemixHiddenAttribute),
	// then Attributes[i].Value must be set accordingly.
	Attributes []IdemixAttribute
	// RhIndex is the index of attribute containing the revocation handler.
	// Notice that this attributed cannot be disclosed
	RhIndex int
	// EidIndex contains the index of the EID attrbiute
	EidIndex int
	// CRI contains the credential revocation information
	CRI []byte
	// Epoch is the revocation epoch the signature should be produced against
	Epoch int
	// RevocationPublicKey is the revocation public key
	RevocationPublicKey Key
	// H is the hash function to be used
	H crypto.Hash
	// SigType is the type of signature that shall be generated
	SigType SignatureType
	// IdemixSignerMetadata contains metadata about the signature
	Metadata *IdemixSignerMetadata
	// VerificationType controls what type of verification the caller expects
	VerificationType VerificationType
}

IdemixSignerOpts contains the options to generate an Idemix signature

func (*IdemixSignerOpts) HashFunc 

func (o *IdemixSignerOpts) HashFunc() crypto.Hash

type IdemixUserSecretKeyGenOpts 

type IdemixUserSecretKeyGenOpts struct {
	Temporary bool
}

IdemixUserSecretKeyGenOpts contains the options for the generation of an Idemix credential secret key.

func (*IdemixUserSecretKeyGenOpts) Algorithm 

func (*IdemixUserSecretKeyGenOpts) Algorithm() string

Algorithm returns the key generation algorithm identifier (to be used).

func (*IdemixUserSecretKeyGenOpts) Ephemeral 

func (o *IdemixUserSecretKeyGenOpts) Ephemeral() bool

Ephemeral returns true if the key to generate has to be ephemeral, false otherwise.

type IdemixUserSecretKeyImportOpts 

type IdemixUserSecretKeyImportOpts struct {
	Temporary bool
}

IdemixUserSecretKeyImportOpts contains the options for importing of an Idemix credential secret key.

func (*IdemixUserSecretKeyImportOpts) Algorithm 

func (*IdemixUserSecretKeyImportOpts) Algorithm() string

Algorithm returns the key generation algorithm identifier (to be used).

func (*IdemixUserSecretKeyImportOpts) Ephemeral 

func (o *IdemixUserSecretKeyImportOpts) Ephemeral() bool

Ephemeral returns true if the key to generate has to be ephemeral, false otherwise.

type Issuer 

type Issuer interface {
	// NewKey generates a new idemix issuer key w.r.t the passed attribute names.
	NewKey(AttributeNames []string) (IssuerSecretKey, error)

	// NewPublicKeyFromBytes converts the passed bytes to an Issuer key
	// It makes sure that the so obtained  key has the passed attributes, if specified
	NewKeyFromBytes(raw []byte, attributes []string) (IssuerSecretKey, error)

	// NewPublicKeyFromBytes converts the passed bytes to an Issuer public key
	// It makes sure that the so obtained public key has the passed attributes, if specified
	NewPublicKeyFromBytes(raw []byte, attributes []string) (IssuerPublicKey, error)
}

Issuer is a local interface to decouple from the idemix implementation

type IssuerPublicKey 

type IssuerPublicKey interface {

	// Bytes returns the byte representation of this key
	Bytes() ([]byte, error)

	// Hash returns the hash representation of this key.
	// The output is supposed to be collision-resistant
	Hash() []byte
}

IssuerPublicKey is the issuer public key

type IssuerSecretKey 

type IssuerSecretKey interface {

	// Bytes returns the byte representation of this key
	Bytes() ([]byte, error)

	// Public returns the corresponding public key
	Public() IssuerPublicKey
}

IssuerPublicKey is the issuer secret key

type Key 

type Key interface {

	// Bytes converts this key to its byte representation,
	// if this operation is allowed.
	Bytes() ([]byte, error)

	// SKI returns the subject key identifier of this key.
	SKI() []byte

	// Symmetric returns true if this key is a symmetric key,
	// false is this key is asymmetric
	Symmetric() bool

	// Private returns true if this key is a private key,
	// false otherwise.
	Private() bool

	// PublicKey returns the corresponding public key part of an asymmetric public/private key pair.
	// This method returns an error in symmetric key schemes.
	PublicKey() (Key, error)
}

Key represents a cryptographic key

type KeyDerivOpts 

type KeyDerivOpts interface {

	// Algorithm returns the key derivation algorithm identifier (to be used).
	Algorithm() string

	// Ephemeral returns true if the key to derived has to be ephemeral,
	// false otherwise.
	Ephemeral() bool
}

KeyDerivOpts contains options for key-derivation with a CSP.

type KeyGenOpts 

type KeyGenOpts interface {

	// Algorithm returns the key generation algorithm identifier (to be used).
	Algorithm() string

	// Ephemeral returns true if the key to generate has to be ephemeral,
	// false otherwise.
	Ephemeral() bool
}

KeyGenOpts contains options for key-generation with a CSP.

type KeyImportOpts 

type KeyImportOpts interface {

	// Algorithm returns the key importation algorithm identifier (to be used).
	Algorithm() string

	// Ephemeral returns true if the key generated has to be ephemeral,
	// false otherwise.
	Ephemeral() bool
}

KeyImportOpts contains options for importing the raw material of a key with a CSP.

type KeyStore 

type KeyStore interface {

	// ReadOnly returns true if this KeyStore is read only, false otherwise.
	// If ReadOnly is true then StoreKey will fail.
	ReadOnly() bool

	// GetKey returns a key object whose SKI is the one passed.
	GetKey(ski []byte) (k Key, err error)

	// StoreKey stores the key k in this KeyStore.
	// If this KeyStore is read only then the method will fail.
	StoreKey(k Key) (err error)
}

KeyStore represents a storage system for cryptographic keys. It allows to store and retrieve bccsp.Key objects. The KeyStore can be read only, in that case StoreKey will return an error.

type NymSignatureScheme 

type NymSignatureScheme interface {
	// Sign creates a new idemix pseudonym signature
	Sign(sk *math.Zr, Nym *math.G1, RNym *math.Zr, ipk IssuerPublicKey, digest []byte) ([]byte, error)

	// Verify verifies an idemix NymSignature
	Verify(pk IssuerPublicKey, Nym *math.G1, signature, digest []byte) error
}

NymSignatureScheme is a local interface to decouple from the idemix implementation the nym sign-related operations

type Revocation 

type Revocation interface {

	// NewKey generates a long term signing key that will be used for revocation
	NewKey() (*ecdsa.PrivateKey, error)

	// NewKeyFromBytes generates a long term signing key that will be used for revocation from the passed bytes
	NewKeyFromBytes(raw []byte) (*ecdsa.PrivateKey, error)

	// Sign creates the Credential Revocation Information for a certain time period (epoch).
	// Users can use the CRI to prove that they are not revoked.
	// Note that when not using revocation (i.e., alg = ALG_NO_REVOCATION), the entered unrevokedHandles are not used,
	// and the resulting CRI can be used by any signer.
	Sign(key *ecdsa.PrivateKey, unrevokedHandles [][]byte, epoch int, alg RevocationAlgorithm) ([]byte, error)

	// Verify verifies that the revocation PK for a certain epoch is valid,
	// by checking that it was signed with the long term revocation key.
	// Note that even if we use no revocation (i.e., alg = ALG_NO_REVOCATION), we need
	// to verify the signature to make sure the issuer indeed signed that no revocation
	// is used in this epoch.
	Verify(pk *ecdsa.PublicKey, cri []byte, epoch int, alg RevocationAlgorithm) error
}

Revocation is a local interface to decouple from the idemix implementation the revocation-related operations

type RevocationAlgorithm 

type RevocationAlgorithm int32

RevocationAlgorithm identifies the revocation algorithm 

const (
	// AlgNoRevocation means no revocation support
	AlgNoRevocation RevocationAlgorithm = iota
)

type RhNymAuditOpts 

type RhNymAuditOpts struct {
	AuditVerificationType AuditVerificationType
	RhIndex               int      // Index of revocation handle attribute in signature
	RevocationHandle      string   // Revocation handle of identity
	RNymRh                *math.Zr // Field element of randomness
}

RhNymAuditOpts contains audit options for pseudonymous revocation handle

func (*RhNymAuditOpts) HashFunc 

func (o *RhNymAuditOpts) HashFunc() crypto.Hash

type SignatureScheme 

type SignatureScheme interface {
	// Sign creates a new idemix signature (Schnorr-type signature).
	// The attributes slice steers which attributes are disclosed:
	// If attributes[i].Type == bccsp.IdemixHiddenAttribute then attribute i remains hidden and otherwise it is disclosed.
	// We require the revocation handle to remain undisclosed (i.e., attributes[rhIndex] == bccsp.IdemixHiddenAttribute).
	// Parameters are to be understood as follow:
	// cred: the serialized version of an idemix credential;
	// sk: the user secret key;
	// (Nym, RNym): Nym key-pair;
	// ipk: issuer public key;
	// attributes: as described above;
	// msg: the message to be signed;
	// rhIndex: revocation handle index relative to attributes;
	// cri: the serialized version of the Credential Revocation Information (it contains the epoch this signature
	// is created in reference to).
	Sign(cred []byte, sk *math.Zr, Nym *math.G1, RNym *math.Zr, ipk IssuerPublicKey, attributes []IdemixAttribute, msg []byte, rhIndex, eidIndex int, cri []byte, sigType SignatureType, metadata *IdemixSignerMetadata) ([]byte, *IdemixSignerMetadata, error)

	// Verify verifies an idemix signature.
	// The attribute slice steers which attributes it expects to be disclosed
	// If attributes[i].Type == bccsp.IdemixHiddenAttribute then attribute i remains hidden and otherwise
	// attributes[i].Value is expected to contain the disclosed attribute value.
	// In other words, this function will check that if attribute i is disclosed, the i-th attribute equals attributes[i].Value.
	// Parameters are to be understood as follow:
	// ipk: issuer public key;
	// signature: signature to verify;
	// msg: message signed;
	// attributes: as described above;
	// rhIndex: revocation handle index relative to attributes;
	// revocationPublicKey: revocation public key;
	// epoch: revocation epoch.
	Verify(ipk IssuerPublicKey, signature, msg []byte, attributes []IdemixAttribute, rhIndex, eidIndex int,
		revocationPublicKey *ecdsa.PublicKey, epoch int, verType VerificationType, meta *IdemixSignerMetadata) error

	// AuditNymEid permits the auditing of the nym eid generated by a signer
	AuditNymEid(ipk IssuerPublicKey, eidIndex int, signature []byte, enrollmentID string, RNymEid *math.Zr, verType AuditVerificationType) error

	// AuditNymRh permits the auditing of the nym rh generated by a signer
	AuditNymRh(ipk IssuerPublicKey, rhIndex int, signature []byte, revocationHandle string, RNymRh *math.Zr, verType AuditVerificationType) error
}

SignatureScheme is a local interface to decouple from the idemix implementation the sign-related operations

type SignatureType 

type SignatureType int

SignatureType describes the type of idemix signature 

const (
	// Standard is the base signature type
	Standard SignatureType = iota
	// EidNym adds a hiding and binding commitment to the enrollment id and proves its correctness
	EidNym
	// EidNymRhNym adds a hiding and binding commitment to both the enrollment id and the revocation handle and proves each of their correctness
	EidNymRhNym
)

type SignerOpts 

type SignerOpts interface {
	crypto.SignerOpts
}

SignerOpts contains options for signing with a CSP.

type User 

type User interface {
	// NewKey generates a new User secret key
	NewKey() (*math.Zr, error)

	// NewKeyFromBytes converts the passed bytes to a User secret key
	NewKeyFromBytes(raw []byte) (*math.Zr, error)

	// MakeNym creates a new unlinkable pseudonym
	MakeNym(sk *math.Zr, key IssuerPublicKey) (*math.G1, *math.Zr, error)

	NewNymFromBytes(raw []byte) (*math.G1, *math.Zr, error)

	// NewPublicNymFromBytes converts the passed bytes to a public nym
	NewPublicNymFromBytes(raw []byte) (*math.G1, error)
}

User is a local interface to decouple from the idemix implementation

type VerificationType 

type VerificationType int

VerificationType describes the type of verification that is required 

const (
	// Basic performs the verification without any of the extensions (e.g. it ignores the eid nym and rh nym)
	Basic VerificationType = iota
	// BestEffort performs all verifications possible given the available information in the signature/opts
	BestEffort
	// ExpectStandard expects a SignatureType of type Standard
	ExpectStandard
	// ExpectEidNym expects a SignatureType of type EidNym
	ExpectEidNym
	// ExpectEidNymRhNym expects a SignatureType of EidNymRhNym
	ExpectEidNymRhNym
)

Source Files

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Path Synopsis
Code generated by counterfeiter.
 Code generated by counterfeiter.

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