diff options
Diffstat (limited to 'src/pkg/crypto/tls/cipher_suites.go')
| -rw-r--r-- | src/pkg/crypto/tls/cipher_suites.go | 270 |
1 files changed, 0 insertions, 270 deletions
diff --git a/src/pkg/crypto/tls/cipher_suites.go b/src/pkg/crypto/tls/cipher_suites.go deleted file mode 100644 index 39a51459d..000000000 --- a/src/pkg/crypto/tls/cipher_suites.go +++ /dev/null @@ -1,270 +0,0 @@ -// Copyright 2010 The Go Authors. All rights reserved. -// Use of this source code is governed by a BSD-style -// license that can be found in the LICENSE file. - -package tls - -import ( - "crypto/aes" - "crypto/cipher" - "crypto/des" - "crypto/hmac" - "crypto/rc4" - "crypto/sha1" - "crypto/x509" - "hash" -) - -// a keyAgreement implements the client and server side of a TLS key agreement -// protocol by generating and processing key exchange messages. -type keyAgreement interface { - // On the server side, the first two methods are called in order. - - // In the case that the key agreement protocol doesn't use a - // ServerKeyExchange message, generateServerKeyExchange can return nil, - // nil. - generateServerKeyExchange(*Config, *Certificate, *clientHelloMsg, *serverHelloMsg) (*serverKeyExchangeMsg, error) - processClientKeyExchange(*Config, *Certificate, *clientKeyExchangeMsg, uint16) ([]byte, error) - - // On the client side, the next two methods are called in order. - - // This method may not be called if the server doesn't send a - // ServerKeyExchange message. - processServerKeyExchange(*Config, *clientHelloMsg, *serverHelloMsg, *x509.Certificate, *serverKeyExchangeMsg) error - generateClientKeyExchange(*Config, *clientHelloMsg, *x509.Certificate) ([]byte, *clientKeyExchangeMsg, error) -} - -const ( - // suiteECDH indicates that the cipher suite involves elliptic curve - // Diffie-Hellman. This means that it should only be selected when the - // client indicates that it supports ECC with a curve and point format - // that we're happy with. - suiteECDHE = 1 << iota - // suiteECDSA indicates that the cipher suite involves an ECDSA - // signature and therefore may only be selected when the server's - // certificate is ECDSA. If this is not set then the cipher suite is - // RSA based. - suiteECDSA - // suiteTLS12 indicates that the cipher suite should only be advertised - // and accepted when using TLS 1.2. - suiteTLS12 -) - -// A cipherSuite is a specific combination of key agreement, cipher and MAC -// function. All cipher suites currently assume RSA key agreement. -type cipherSuite struct { - id uint16 - // the lengths, in bytes, of the key material needed for each component. - keyLen int - macLen int - ivLen int - ka func(version uint16) keyAgreement - // flags is a bitmask of the suite* values, above. - flags int - cipher func(key, iv []byte, isRead bool) interface{} - mac func(version uint16, macKey []byte) macFunction - aead func(key, fixedNonce []byte) cipher.AEAD -} - -var cipherSuites = []*cipherSuite{ - // Ciphersuite order is chosen so that ECDHE comes before plain RSA - // and RC4 comes before AES (because of the Lucky13 attack). - {TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256, 16, 0, 4, ecdheRSAKA, suiteECDHE | suiteTLS12, nil, nil, aeadAESGCM}, - {TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, 16, 0, 4, ecdheECDSAKA, suiteECDHE | suiteECDSA | suiteTLS12, nil, nil, aeadAESGCM}, - {TLS_ECDHE_RSA_WITH_RC4_128_SHA, 16, 20, 0, ecdheRSAKA, suiteECDHE, cipherRC4, macSHA1, nil}, - {TLS_ECDHE_ECDSA_WITH_RC4_128_SHA, 16, 20, 0, ecdheECDSAKA, suiteECDHE | suiteECDSA, cipherRC4, macSHA1, nil}, - {TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA, 16, 20, 16, ecdheRSAKA, suiteECDHE, cipherAES, macSHA1, nil}, - {TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA, 16, 20, 16, ecdheECDSAKA, suiteECDHE | suiteECDSA, cipherAES, macSHA1, nil}, - {TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA, 32, 20, 16, ecdheRSAKA, suiteECDHE, cipherAES, macSHA1, nil}, - {TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA, 32, 20, 16, ecdheECDSAKA, suiteECDHE | suiteECDSA, cipherAES, macSHA1, nil}, - {TLS_RSA_WITH_RC4_128_SHA, 16, 20, 0, rsaKA, 0, cipherRC4, macSHA1, nil}, - {TLS_RSA_WITH_AES_128_CBC_SHA, 16, 20, 16, rsaKA, 0, cipherAES, macSHA1, nil}, - {TLS_RSA_WITH_AES_256_CBC_SHA, 32, 20, 16, rsaKA, 0, cipherAES, macSHA1, nil}, - {TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA, 24, 20, 8, ecdheRSAKA, suiteECDHE, cipher3DES, macSHA1, nil}, - {TLS_RSA_WITH_3DES_EDE_CBC_SHA, 24, 20, 8, rsaKA, 0, cipher3DES, macSHA1, nil}, -} - -func cipherRC4(key, iv []byte, isRead bool) interface{} { - cipher, _ := rc4.NewCipher(key) - return cipher -} - -func cipher3DES(key, iv []byte, isRead bool) interface{} { - block, _ := des.NewTripleDESCipher(key) - if isRead { - return cipher.NewCBCDecrypter(block, iv) - } - return cipher.NewCBCEncrypter(block, iv) -} - -func cipherAES(key, iv []byte, isRead bool) interface{} { - block, _ := aes.NewCipher(key) - if isRead { - return cipher.NewCBCDecrypter(block, iv) - } - return cipher.NewCBCEncrypter(block, iv) -} - -// macSHA1 returns a macFunction for the given protocol version. -func macSHA1(version uint16, key []byte) macFunction { - if version == VersionSSL30 { - mac := ssl30MAC{ - h: sha1.New(), - key: make([]byte, len(key)), - } - copy(mac.key, key) - return mac - } - return tls10MAC{hmac.New(sha1.New, key)} -} - -type macFunction interface { - Size() int - MAC(digestBuf, seq, header, data []byte) []byte -} - -// fixedNonceAEAD wraps an AEAD and prefixes a fixed portion of the nonce to -// each call. -type fixedNonceAEAD struct { - // sealNonce and openNonce are buffers where the larger nonce will be - // constructed. Since a seal and open operation may be running - // concurrently, there is a separate buffer for each. - sealNonce, openNonce []byte - aead cipher.AEAD -} - -func (f *fixedNonceAEAD) NonceSize() int { return 8 } -func (f *fixedNonceAEAD) Overhead() int { return f.aead.Overhead() } - -func (f *fixedNonceAEAD) Seal(out, nonce, plaintext, additionalData []byte) []byte { - copy(f.sealNonce[len(f.sealNonce)-8:], nonce) - return f.aead.Seal(out, f.sealNonce, plaintext, additionalData) -} - -func (f *fixedNonceAEAD) Open(out, nonce, plaintext, additionalData []byte) ([]byte, error) { - copy(f.openNonce[len(f.openNonce)-8:], nonce) - return f.aead.Open(out, f.openNonce, plaintext, additionalData) -} - -func aeadAESGCM(key, fixedNonce []byte) cipher.AEAD { - aes, err := aes.NewCipher(key) - if err != nil { - panic(err) - } - aead, err := cipher.NewGCM(aes) - if err != nil { - panic(err) - } - - nonce1, nonce2 := make([]byte, 12), make([]byte, 12) - copy(nonce1, fixedNonce) - copy(nonce2, fixedNonce) - - return &fixedNonceAEAD{nonce1, nonce2, aead} -} - -// ssl30MAC implements the SSLv3 MAC function, as defined in -// www.mozilla.org/projects/security/pki/nss/ssl/draft302.txt section 5.2.3.1 -type ssl30MAC struct { - h hash.Hash - key []byte -} - -func (s ssl30MAC) Size() int { - return s.h.Size() -} - -var ssl30Pad1 = [48]byte{0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36} - -var ssl30Pad2 = [48]byte{0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c} - -func (s ssl30MAC) MAC(digestBuf, seq, header, data []byte) []byte { - padLength := 48 - if s.h.Size() == 20 { - padLength = 40 - } - - s.h.Reset() - s.h.Write(s.key) - s.h.Write(ssl30Pad1[:padLength]) - s.h.Write(seq) - s.h.Write(header[:1]) - s.h.Write(header[3:5]) - s.h.Write(data) - digestBuf = s.h.Sum(digestBuf[:0]) - - s.h.Reset() - s.h.Write(s.key) - s.h.Write(ssl30Pad2[:padLength]) - s.h.Write(digestBuf) - return s.h.Sum(digestBuf[:0]) -} - -// tls10MAC implements the TLS 1.0 MAC function. RFC 2246, section 6.2.3. -type tls10MAC struct { - h hash.Hash -} - -func (s tls10MAC) Size() int { - return s.h.Size() -} - -func (s tls10MAC) MAC(digestBuf, seq, header, data []byte) []byte { - s.h.Reset() - s.h.Write(seq) - s.h.Write(header) - s.h.Write(data) - return s.h.Sum(digestBuf[:0]) -} - -func rsaKA(version uint16) keyAgreement { - return rsaKeyAgreement{} -} - -func ecdheECDSAKA(version uint16) keyAgreement { - return &ecdheKeyAgreement{ - sigType: signatureECDSA, - version: version, - } -} - -func ecdheRSAKA(version uint16) keyAgreement { - return &ecdheKeyAgreement{ - sigType: signatureRSA, - version: version, - } -} - -// mutualCipherSuite returns a cipherSuite given a list of supported -// ciphersuites and the id requested by the peer. -func mutualCipherSuite(have []uint16, want uint16) *cipherSuite { - for _, id := range have { - if id == want { - for _, suite := range cipherSuites { - if suite.id == want { - return suite - } - } - return nil - } - } - return nil -} - -// A list of the possible cipher suite ids. Taken from -// http://www.iana.org/assignments/tls-parameters/tls-parameters.xml -const ( - TLS_RSA_WITH_RC4_128_SHA uint16 = 0x0005 - TLS_RSA_WITH_3DES_EDE_CBC_SHA uint16 = 0x000a - TLS_RSA_WITH_AES_128_CBC_SHA uint16 = 0x002f - TLS_RSA_WITH_AES_256_CBC_SHA uint16 = 0x0035 - TLS_ECDHE_ECDSA_WITH_RC4_128_SHA uint16 = 0xc007 - TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA uint16 = 0xc009 - TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA uint16 = 0xc00a - TLS_ECDHE_RSA_WITH_RC4_128_SHA uint16 = 0xc011 - TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA uint16 = 0xc012 - TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA uint16 = 0xc013 - TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA uint16 = 0xc014 - TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 uint16 = 0xc02f - TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 uint16 = 0xc02b -) |