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// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
// SPDX-License-Identifier: MIT
package ciphersuite
import (
"crypto/sha256"
"fmt"
"hash"
"sync/atomic"
"github.com/pion/dtls/v3/pkg/crypto/ciphersuite"
"github.com/pion/dtls/v3/pkg/crypto/clientcertificate"
"github.com/pion/dtls/v3/pkg/crypto/prf"
"github.com/pion/dtls/v3/pkg/protocol/recordlayer"
)
// TLSEcdheEcdsaWithAes128GcmSha256 represents a TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 CipherSuite.
type TLSEcdheEcdsaWithAes128GcmSha256 struct {
gcm atomic.Value // *cryptoGCM
}
// CertificateType returns what type of certficate this CipherSuite exchanges.
func (c *TLSEcdheEcdsaWithAes128GcmSha256) CertificateType() clientcertificate.Type {
return clientcertificate.ECDSASign
}
// KeyExchangeAlgorithm controls what key exchange algorithm is using during the handshake.
func (c *TLSEcdheEcdsaWithAes128GcmSha256) KeyExchangeAlgorithm() KeyExchangeAlgorithm {
return KeyExchangeAlgorithmEcdhe
}
// ECC uses Elliptic Curve Cryptography.
func (c *TLSEcdheEcdsaWithAes128GcmSha256) ECC() bool {
return true
}
// ID returns the ID of the CipherSuite.
func (c *TLSEcdheEcdsaWithAes128GcmSha256) ID() ID {
return TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
}
func (c *TLSEcdheEcdsaWithAes128GcmSha256) String() string {
return "TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256"
}
// HashFunc returns the hashing func for this CipherSuite.
func (c *TLSEcdheEcdsaWithAes128GcmSha256) HashFunc() func() hash.Hash {
return sha256.New
}
// AuthenticationType controls what authentication method is using during the handshake.
func (c *TLSEcdheEcdsaWithAes128GcmSha256) AuthenticationType() AuthenticationType {
return AuthenticationTypeCertificate
}
// IsInitialized returns if the CipherSuite has keying material and can
// encrypt/decrypt packets.
func (c *TLSEcdheEcdsaWithAes128GcmSha256) IsInitialized() bool {
return c.gcm.Load() != nil
}
func (c *TLSEcdheEcdsaWithAes128GcmSha256) init(
masterSecret, clientRandom, serverRandom []byte,
isClient bool,
prfMacLen, prfKeyLen, prfIvLen int,
hashFunc func() hash.Hash,
) error {
keys, err := prf.GenerateEncryptionKeys(
masterSecret, clientRandom, serverRandom, prfMacLen, prfKeyLen, prfIvLen, hashFunc,
)
if err != nil {
return err
}
var gcm *ciphersuite.GCM
if isClient {
gcm, err = ciphersuite.NewGCM(keys.ClientWriteKey, keys.ClientWriteIV, keys.ServerWriteKey, keys.ServerWriteIV)
} else {
gcm, err = ciphersuite.NewGCM(keys.ServerWriteKey, keys.ServerWriteIV, keys.ClientWriteKey, keys.ClientWriteIV)
}
c.gcm.Store(gcm)
return err
}
// Init initializes the internal Cipher with keying material.
func (c *TLSEcdheEcdsaWithAes128GcmSha256) Init(masterSecret, clientRandom, serverRandom []byte, isClient bool) error {
const (
prfMacLen = 0
prfKeyLen = 16
prfIvLen = 4
)
return c.init(masterSecret, clientRandom, serverRandom, isClient, prfMacLen, prfKeyLen, prfIvLen, c.HashFunc())
}
// Encrypt encrypts a single TLS RecordLayer.
func (c *TLSEcdheEcdsaWithAes128GcmSha256) Encrypt(pkt *recordlayer.RecordLayer, raw []byte) ([]byte, error) {
cipherSuite, ok := c.gcm.Load().(*ciphersuite.GCM)
if !ok {
return nil, fmt.Errorf("%w, unable to encrypt", errCipherSuiteNotInit)
}
return cipherSuite.Encrypt(pkt, raw)
}
// Decrypt decrypts a single TLS RecordLayer.
func (c *TLSEcdheEcdsaWithAes128GcmSha256) Decrypt(h recordlayer.Header, raw []byte) ([]byte, error) {
cipherSuite, ok := c.gcm.Load().(*ciphersuite.GCM)
if !ok {
return nil, fmt.Errorf("%w, unable to decrypt", errCipherSuiteNotInit)
}
return cipherSuite.Decrypt(h, raw)
}
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