Documentation
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Index ¶
Constants ¶
This section is empty.
Variables ¶
var ( // ErrUnexpectedSize is the error used if the size of a parameter does not match its expected value. ErrUnexpectedSize = errors.New("blindsign/blindrsa: unexpected input size") // ErrInvalidMessageLength is the error used if the size of a protocol message does not match its expected value. ErrInvalidMessageLength = errors.New("blindsign/blindrsa: invalid message length") // ErrInvalidBlind is the error used if the blind generated by the Verifier fails. ErrInvalidBlind = errors.New("blindsign/blindrsa: invalid blind") // ErrInvalidRandomness is the error used if caller did not provide randomness to the Blind() function. ErrInvalidRandomness = errors.New("blindsign/blindrsa: invalid random parameter") )
Functions ¶
This section is empty.
Types ¶
type RSASigner ¶
type RSASigner struct {
// contains filtered or unexported fields
}
An RSASigner represents the Signer in the blind RSA protocol. It carries the raw RSA private key used for signing blinded messages.
func NewRSASigner ¶
func NewRSASigner(sk *rsa.PrivateKey) RSASigner
NewRSASigner creates a new Signer for the blind RSA protocol using an RSA private key.
func (RSASigner) BlindSign ¶
BlindSign blindly computes the RSA operation using the Signer's private key on the blinded message input, if it's of valid length, and returns an error should the function fail.
See the specification for more details: https://datatracker.ietf.org/doc/html/draft-irtf-cfrg-rsa-blind-signatures-02#section-5.1.2
type RSAVerifier ¶
type RSAVerifier struct {
// contains filtered or unexported fields
}
An RSAVerifier represents a Verifier in the RSA blind signature protocol. It carries state needed to produce and validate an RSA blind signature.
func NewRSAVerifier ¶
func NewRSAVerifier(pk *rsa.PublicKey, hash hash.Hash) RSAVerifier
NewRSAVerifier creates a new RSAVerifier using the corresponding Signer parameters.
func (RSAVerifier) Blind ¶
func (v RSAVerifier) Blind(random io.Reader, message []byte) ([]byte, blindsign.VerifierState, error)
Blind initializes the blind RSA protocol using an input message and source of randomness. The signature includes a randomly generated PSS salt whose length equals the size of the underlying hash function. This function fails if randomness was not provided.
See the specification for more details: https://datatracker.ietf.org/doc/html/draft-irtf-cfrg-rsa-blind-signatures-02#section-5.1.1
func (RSAVerifier) FixedBlind ¶
func (v RSAVerifier) FixedBlind(message, blind, salt []byte) ([]byte, blindsign.VerifierState, error)
FixedBlind runs the Blind function with fixed blind and salt inputs.
type RSAVerifierState ¶
type RSAVerifierState struct {
// contains filtered or unexported fields
}
An RSAVerifierState carries state needed to complete the blind signature protocol as a verifier.
func (RSAVerifierState) CopyBlind ¶
func (state RSAVerifierState) CopyBlind() []byte
CopyBlind returns an encoding of the blind value used in the protocol.
func (RSAVerifierState) CopySalt ¶
func (state RSAVerifierState) CopySalt() []byte
CopySalt returns an encoding of the per-message salt used in the protocol.
func (RSAVerifierState) Finalize ¶
func (state RSAVerifierState) Finalize(data []byte) ([]byte, error)
Finalize computes and outputs the final signature, if it's valid. Otherwise, it returns an error.
See the specification for more details: https://datatracker.ietf.org/doc/html/draft-irtf-cfrg-rsa-blind-signatures-02#section-5.1.3
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