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package ciphersuite
import (
"crypto/sha1" //nolint: gosec,gci
"crypto/sha256"
"fmt"
"hash"
"sync/atomic"
"github.com/pion/dtls/v2/pkg/crypto/ciphersuite"
"github.com/pion/dtls/v2/pkg/crypto/clientcertificate"
"github.com/pion/dtls/v2/pkg/crypto/prf"
"github.com/pion/dtls/v2/pkg/protocol/recordlayer"
)
// TLSEcdheEcdsaWithAes256CbcSha represents a TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA CipherSuite
type TLSEcdheEcdsaWithAes256CbcSha struct {
cbc atomic.Value // *cryptoCBC
}
// CertificateType returns what type of certficate this CipherSuite exchanges
func (c *TLSEcdheEcdsaWithAes256CbcSha) CertificateType() clientcertificate.Type {
return clientcertificate.ECDSASign
}
// ID returns the ID of the CipherSuite
func (c *TLSEcdheEcdsaWithAes256CbcSha) ID() ID {
return TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA
}
func (c *TLSEcdheEcdsaWithAes256CbcSha) String() string {
return "TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA"
}
// HashFunc returns the hashing func for this CipherSuite
func (c *TLSEcdheEcdsaWithAes256CbcSha) HashFunc() func() hash.Hash {
return sha256.New
}
// AuthenticationType controls what authentication method is using during the handshake
func (c *TLSEcdheEcdsaWithAes256CbcSha) AuthenticationType() AuthenticationType {
return AuthenticationTypeCertificate
}
// IsInitialized returns if the CipherSuite has keying material and can
// encrypt/decrypt packets
func (c *TLSEcdheEcdsaWithAes256CbcSha) IsInitialized() bool {
return c.cbc.Load() != nil
}
// Init initializes the internal Cipher with keying material
func (c *TLSEcdheEcdsaWithAes256CbcSha) Init(masterSecret, clientRandom, serverRandom []byte, isClient bool) error {
const (
prfMacLen = 20
prfKeyLen = 32
prfIvLen = 16
)
keys, err := prf.GenerateEncryptionKeys(masterSecret, clientRandom, serverRandom, prfMacLen, prfKeyLen, prfIvLen, c.HashFunc())
if err != nil {
return err
}
var cbc *ciphersuite.CBC
if isClient {
cbc, err = ciphersuite.NewCBC(
keys.ClientWriteKey, keys.ClientWriteIV, keys.ClientMACKey,
keys.ServerWriteKey, keys.ServerWriteIV, keys.ServerMACKey,
sha1.New,
)
} else {
cbc, err = ciphersuite.NewCBC(
keys.ServerWriteKey, keys.ServerWriteIV, keys.ServerMACKey,
keys.ClientWriteKey, keys.ClientWriteIV, keys.ClientMACKey,
sha1.New,
)
}
c.cbc.Store(cbc)
return err
}
// Encrypt encrypts a single TLS RecordLayer
func (c *TLSEcdheEcdsaWithAes256CbcSha) Encrypt(pkt *recordlayer.RecordLayer, raw []byte) ([]byte, error) {
cbc := c.cbc.Load()
if cbc == nil { // !c.isInitialized()
return nil, fmt.Errorf("%w, unable to encrypt", errCipherSuiteNotInit)
}
return cbc.(*ciphersuite.CBC).Encrypt(pkt, raw)
}
// Decrypt decrypts a single TLS RecordLayer
func (c *TLSEcdheEcdsaWithAes256CbcSha) Decrypt(raw []byte) ([]byte, error) {
cbc := c.cbc.Load()
if cbc == nil { // !c.isInitialized()
return nil, fmt.Errorf("%w, unable to decrypt", errCipherSuiteNotInit)
}
return cbc.(*ciphersuite.CBC).Decrypt(raw)
}
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