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e0553822b0
* Use NewGCMTLS (when using experiment boringcrypto) This change only affects builds built using `GOEXPERIMENT=boringcrypto`. When built with this experiment, we use the NewGCMTLS() method exposed by goboring, which validates that the nonce is strictly monotonically increasing. This is the TLS 1.2 specification for nonce generation (which also matches the method used by the Noise Protocol) - https://github.com/golang/go/blob/go1.19/src/crypto/tls/cipher_suites.go#L520-L522 - https://github.com/golang/go/blob/go1.19/src/crypto/internal/boring/aes.go#L235-L237 - https://github.com/golang/go/blob/go1.19/src/crypto/internal/boring/aes.go#L250 -ae223d6138/include/openssl/aead.h (L379-L381)-ae223d6138/crypto/fipsmodule/cipher/e_aes.c (L1082-L1093)* need to lock around EncryptDanger in SendVia * fix link to test vector
80 lines
2.4 KiB
Go
80 lines
2.4 KiB
Go
//go:build boringcrypto
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// +build boringcrypto
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package noiseutil
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import (
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"crypto/aes"
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"crypto/cipher"
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"encoding/binary"
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// unsafe needed for go:linkname
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_ "unsafe"
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"github.com/flynn/noise"
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)
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// EncryptLockNeeded indicates if calls to Encrypt need a lock
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// This is true for boringcrypto because the Seal function verifies that the
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// nonce is strictly increasing.
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const EncryptLockNeeded = true
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// NewGCMTLS is no longer exposed in go1.19+, so we need to link it in
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// See: https://github.com/golang/go/issues/56326
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//
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// NewGCMTLS is the internal method used with boringcrypto that provices a
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// validated mode of AES-GCM which enforces the nonce is strictly
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// monotonically increasing. This is the TLS 1.2 specification for nonce
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// generation (which also matches the method used by the Noise Protocol)
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//
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// - https://github.com/golang/go/blob/go1.19/src/crypto/tls/cipher_suites.go#L520-L522
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// - https://github.com/golang/go/blob/go1.19/src/crypto/internal/boring/aes.go#L235-L237
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// - https://github.com/golang/go/blob/go1.19/src/crypto/internal/boring/aes.go#L250
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// - https://github.com/google/boringssl/blob/ae223d6138807a13006342edfeef32e813246b39/include/openssl/aead.h#L379-L381
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// - https://github.com/google/boringssl/blob/ae223d6138807a13006342edfeef32e813246b39/crypto/fipsmodule/cipher/e_aes.c#L1082-L1093
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//
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//go:linkname newGCMTLS crypto/internal/boring.NewGCMTLS
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func newGCMTLS(c cipher.Block) (cipher.AEAD, error)
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type cipherFn struct {
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fn func([32]byte) noise.Cipher
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name string
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}
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func (c cipherFn) Cipher(k [32]byte) noise.Cipher { return c.fn(k) }
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func (c cipherFn) CipherName() string { return c.name }
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// CipherAESGCM is the AES256-GCM AEAD cipher (using NewGCMTLS when GoBoring is present)
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var CipherAESGCM noise.CipherFunc = cipherFn{cipherAESGCMBoring, "AESGCM"}
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func cipherAESGCMBoring(k [32]byte) noise.Cipher {
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c, err := aes.NewCipher(k[:])
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if err != nil {
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panic(err)
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}
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gcm, err := newGCMTLS(c)
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if err != nil {
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panic(err)
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}
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return aeadCipher{
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gcm,
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func(n uint64) []byte {
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var nonce [12]byte
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binary.BigEndian.PutUint64(nonce[4:], n)
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return nonce[:]
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},
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}
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}
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type aeadCipher struct {
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cipher.AEAD
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nonce func(uint64) []byte
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}
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func (c aeadCipher) Encrypt(out []byte, n uint64, ad, plaintext []byte) []byte {
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return c.Seal(out, c.nonce(n), plaintext, ad)
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}
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func (c aeadCipher) Decrypt(out []byte, n uint64, ad, ciphertext []byte) ([]byte, error) {
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return c.Open(out, c.nonce(n), ciphertext, ad)
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}
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