62482c7dc9
Update module path from forge.lthn.ai/core/go-crypt to dappco.re/go/core/crypt. Migrate go-log, go-io, go-i18n imports to their new dappco.re/go/core/* paths with updated versions (core v0.5.0, log v0.1.0, io v0.2.0, i18n v0.2.0). Un-migrated modules (cli, go-store, go-inference) remain at forge.lthn.ai paths. Also fixes merge conflict marker and duplicate imports in crypt/openpgp/service.go, and updates CLAUDE.md to reflect new paths. Co-Authored-By: Virgil <virgil@lethean.io>
52 lines
1.2 KiB
Go
52 lines
1.2 KiB
Go
package chachapoly
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import (
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"crypto/rand"
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"fmt"
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"io"
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coreerr "dappco.re/go/core/log"
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"golang.org/x/crypto/chacha20poly1305"
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)
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// Encrypt encrypts data using ChaCha20-Poly1305.
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func Encrypt(plaintext []byte, key []byte) ([]byte, error) {
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aead, err := chacha20poly1305.NewX(key)
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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, aead.NonceSize(), aead.NonceSize()+len(plaintext)+aead.Overhead())
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if _, err := io.ReadFull(rand.Reader, nonce); err != nil {
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return nil, err
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}
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return aead.Seal(nonce, nonce, plaintext, nil), nil
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}
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// Decrypt decrypts data using ChaCha20-Poly1305.
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func Decrypt(ciphertext []byte, key []byte) ([]byte, error) {
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aead, err := chacha20poly1305.NewX(key)
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if err != nil {
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return nil, err
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}
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minLen := aead.NonceSize() + aead.Overhead()
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if len(ciphertext) < minLen {
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return nil, coreerr.E("chachapoly.Decrypt", fmt.Sprintf("ciphertext too short: got %d bytes, need at least %d bytes", len(ciphertext), minLen), nil)
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}
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nonce, ciphertext := ciphertext[:aead.NonceSize()], ciphertext[aead.NonceSize():]
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decrypted, err := aead.Open(nil, nonce, ciphertext, nil)
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if err != nil {
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return nil, err
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}
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if len(decrypted) == 0 {
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return []byte{}, nil
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}
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return decrypted, nil
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}
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