52 lines
1.3 KiB
Go
52 lines
1.3 KiB
Go
package chacha20poly1305
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import (
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"errors"
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"golang.org/x/crypto/chacha20poly1305"
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)
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var ErrInvalidParams = errors.New("chacha20poly1305: invalid params")
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// Decrypt - decrypt without verify
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func Decrypt(key32 []byte, nonce8 string, ciphertext []byte) ([]byte, error) {
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return DecryptAndVerify(key32, nil, []byte(nonce8), ciphertext, nil)
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}
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// Encrypt - encrypt without seal
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func Encrypt(key32 []byte, nonce8 string, plaintext []byte) ([]byte, error) {
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return EncryptAndSeal(key32, nil, []byte(nonce8), plaintext, nil)
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}
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func DecryptAndVerify(key32, dst, nonce8, ciphertext, verify []byte) ([]byte, error) {
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if len(key32) != chacha20poly1305.KeySize || len(nonce8) != 8 {
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return nil, ErrInvalidParams
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}
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aead, err := chacha20poly1305.New(key32)
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if err != nil {
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return nil, err
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}
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nonce := make([]byte, chacha20poly1305.NonceSize)
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copy(nonce[4:], nonce8)
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return aead.Open(dst, nonce, ciphertext, verify)
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}
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func EncryptAndSeal(key32, dst, nonce8, plaintext, verify []byte) ([]byte, error) {
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if len(key32) != chacha20poly1305.KeySize || len(nonce8) != 8 {
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return nil, ErrInvalidParams
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}
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aead, err := chacha20poly1305.New(key32)
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if err != nil {
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return nil, err
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}
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nonce := make([]byte, chacha20poly1305.NonceSize)
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copy(nonce[4:], nonce8)
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return aead.Seal(dst, nonce, plaintext, verify), nil
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}
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