131 lines
3.6 KiB
Go
131 lines
3.6 KiB
Go
/*
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* ZGrab Copyright 2015 Regents of the University of Michigan
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not
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* use this file except in compliance with the License. You may obtain a copy
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* of the License at http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* permissions and limitations under the License.
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*/
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package keys
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import (
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"encoding/json"
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"math/big"
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)
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// DHParams can be used to store finite-field Diffie-Hellman parameters. At any
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// point in time, it is unlikely that both OurPrivate and TheirPrivate will be
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// non-nil.
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type DHParams struct {
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Prime *big.Int
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Generator *big.Int
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ServerPublic *big.Int
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ServerPrivate *big.Int
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ClientPublic *big.Int
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ClientPrivate *big.Int
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SessionKey *big.Int
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}
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type auxDHParams struct {
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Prime *cryptoParameter `json:"prime"`
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Generator *cryptoParameter `json:"generator"`
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ServerPublic *cryptoParameter `json:"server_public,omitempty"`
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ServerPrivate *cryptoParameter `json:"server_private,omitempty"`
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ClientPublic *cryptoParameter `json:"client_public,omitempty"`
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ClientPrivate *cryptoParameter `json:"client_private,omitempty"`
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SessionKey *cryptoParameter `json:"session_key,omitempty"`
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}
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// MarshalJSON implements the json.Marshal interface
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func (p *DHParams) MarshalJSON() ([]byte, error) {
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aux := auxDHParams{
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Prime: &cryptoParameter{Int: p.Prime},
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Generator: &cryptoParameter{Int: p.Generator},
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}
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if p.ServerPublic != nil {
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aux.ServerPublic = &cryptoParameter{Int: p.ServerPublic}
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}
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if p.ServerPrivate != nil {
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aux.ServerPrivate = &cryptoParameter{Int: p.ServerPrivate}
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}
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if p.ClientPublic != nil {
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aux.ClientPublic = &cryptoParameter{Int: p.ClientPublic}
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}
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if p.ClientPrivate != nil {
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aux.ClientPrivate = &cryptoParameter{Int: p.ClientPrivate}
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}
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if p.SessionKey != nil {
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aux.SessionKey = &cryptoParameter{Int: p.SessionKey}
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}
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return json.Marshal(aux)
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}
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// UnmarshalJSON implement the json.Unmarshaler interface
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func (p *DHParams) UnmarshalJSON(b []byte) error {
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var aux auxDHParams
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if err := json.Unmarshal(b, &aux); err != nil {
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return err
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}
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if aux.Prime != nil {
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p.Prime = aux.Prime.Int
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}
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if aux.Generator != nil {
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p.Generator = aux.Generator.Int
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}
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if aux.ServerPublic != nil {
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p.ServerPublic = aux.ServerPublic.Int
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}
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if aux.ServerPrivate != nil {
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p.ServerPrivate = aux.ServerPrivate.Int
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}
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if aux.ClientPublic != nil {
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p.ClientPublic = aux.ClientPublic.Int
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}
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if aux.ClientPrivate != nil {
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p.ClientPrivate = aux.ClientPrivate.Int
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}
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if aux.SessionKey != nil {
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p.SessionKey = aux.SessionKey.Int
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}
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return nil
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}
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// CryptoParameter represents a big.Int used a parameter in some cryptography.
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// It serializes to json as a tupe of a base64-encoded number and a length in
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// bits.
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type cryptoParameter struct {
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*big.Int
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}
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type auxCryptoParameter struct {
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Raw []byte `json:"value"`
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Length int `json:"length"`
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}
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// MarshalJSON implements the json.Marshaler interface
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func (p *cryptoParameter) MarshalJSON() ([]byte, error) {
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var aux auxCryptoParameter
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if p.Int != nil {
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aux.Raw = p.Bytes()
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aux.Length = 8 * len(aux.Raw)
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}
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return json.Marshal(&aux)
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}
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// UnmarshalJSON implements the json.Unmarshal interface
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func (p *cryptoParameter) UnmarshalJSON(b []byte) error {
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var aux auxCryptoParameter
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if err := json.Unmarshal(b, &aux); err != nil {
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return err
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}
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p.Int = new(big.Int)
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p.SetBytes(aux.Raw)
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return nil
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}
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