cryptofmt

Documentation

Overview

Package cryptofmt provides constants and convenience methods that define the format of ciphertexts and signatures.

Index

• Constants
• func OutputPrefix(key *tinkpb.Keyset_Key) (string, error)

Constants

const (
	// NonRawPrefixSize is the prefix size of Tink and Legacy key types.
	NonRawPrefixSize = 5

	// LegacyPrefixSize is the prefix size of legacy key types.
	// The prefix starts with \x00 and followed by a 4-byte key id.
	LegacyPrefixSize = NonRawPrefixSize
	// LegacyStartByte is the first byte of the prefix of legacy key types.
	LegacyStartByte = byte(0)

	// TinkPrefixSize is the prefix size of Tink key types.
	// The prefix starts with \x01 and followed by a 4-byte key id.
	TinkPrefixSize = NonRawPrefixSize
	// TinkStartByte is the first byte of the prefix of Tink key types.
	TinkStartByte = byte(1)

	// RawPrefixSize is the prefix size of Raw key types.
	// Raw prefix is empty.
	RawPrefixSize = 0
	// RawPrefix is the empty prefix of Raw key types.
	RawPrefix = ""
)

Functions

func OutputPrefix

func OutputPrefix(key *tinkpb.Keyset_Key) (string, error)

OutputPrefix generates the prefix of ciphertexts produced by the crypto primitive obtained from key. The prefix can be either empty (for RAW-type prefix), or consists of a 1-byte indicator of the type of the prefix, followed by 4 bytes of the key ID in big endian encoding.