commitments

Documentation

Overview

Package commitments implements a cryptographic commitment.

Commitment scheme is as follows: T = HMAC(fixedKey, "Key Transparency Commitment" || 16 byte nonce || message) message is defined as: len(userID) || userID || data

Index

• Variables
• func Commit(userID, appID string, data []byte) ([]byte, *tpb.Committed, error)
• func Verify(userID, appID string, commitment []byte, committed *tpb.Committed) error
• type Committer

Variables

var (

	// ErrInvalidCommitment occurs when the commitment doesn't match the profile.
	ErrInvalidCommitment = errors.New("invalid commitment")
)

Functions

func Commit

func Commit(userID, appID string, data []byte) ([]byte, *tpb.Committed, error)

Commit makes a cryptographic commitment under a specific userID to data.

func Verify

func Verify(userID, appID string, commitment []byte, committed *tpb.Committed) error

Verify customizes a commitment with a userID.

Types

type Committer

type Committer interface {
	// Write saves a cryptographic commitment and associated data.
	Write(ctx context.Context, commitment []byte, committed *tpb.Committed) error
	// Read looks up a cryptograpic commitment and returns associated data.
	Read(ctx context.Context, commitment []byte) (*tpb.Committed, error)
}

Committer saves cryptographic commitments.