mirror of
https://github.com/v2fly/v2ray-core.git
synced 2024-06-27 09:55:22 +00:00
37 lines
821 B
Go
37 lines
821 B
Go
package encoding
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import (
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"hash/fnv"
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"v2ray.com/core/common/crypto"
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"v2ray.com/core/common/serial"
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)
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func Authenticate(b []byte) uint32 {
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fnv1hash := fnv.New32a()
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fnv1hash.Write(b)
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return fnv1hash.Sum32()
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}
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type FnvAuthenticator struct {
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}
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func (v *FnvAuthenticator) NonceSize() int {
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return 0
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}
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func (v *FnvAuthenticator) Overhead() int {
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return 4
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}
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func (v *FnvAuthenticator) Seal(dst, nonce, plaintext, additionalData []byte) []byte {
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dst = serial.Uint32ToBytes(Authenticate(plaintext), dst[:0])
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return append(dst, plaintext...)
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}
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func (v *FnvAuthenticator) Open(dst, nonce, ciphertext, additionalData []byte) ([]byte, error) {
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if serial.BytesToUint32(ciphertext[:4]) != Authenticate(ciphertext[4:]) {
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return dst, crypto.ErrAuthenticationFailed
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}
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return append(dst[:0], ciphertext[4:]...), nil
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}
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