go/hybrid/hybrid.go

// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
////////////////////////////////////////////////////////////////////////////////

// Package hybrid provides subtle implementations of the HKDF and EC primitives.
// The functionality of Hybrid Encryption is represented as a pair of primitives (interfaces):
// HybridEncrypt for encryption of data, and HybridDecrypt for decryption.
// Implementations of these interfaces are secure against adaptive chosen ciphertext attacks. In
// addition to plaintext the encryption takes an extra parameter contextInfo, which
// usually is public data implicit from the context, but should be bound to the resulting
// ciphertext, i.e. the ciphertext allows for checking the integrity of contextInfo (but
// there are no guarantees wrt. the secrecy or authenticity of contextInfo).
// Example:
//
// package main
//
// import (
//     "github.com/google/tink/go/hybrid"
//     "github.com/google/tink/go/core/registry"
//     "github.com/google/tink/go/keyset"
// )
//
// func main() {
//
//     kh , err := keyset.NewHandle(hybrid.ECIESHKDFAES128CTRHMACSHA256KeyTemplate())
//     if err != nil {
//         //handle error
//     }
//     h := hybrid.NewHybridEncrypt(kh)
//
//     ct, err = h.Encrypt([]byte("secret message"), []byte("context info"))
//     if err != nil {
//         // handle error
//     }
//
//     khd , err := keyset.NewHandle( .....); /// get a handle on the decryption key material
//     hd := hybrid.NewHybridDecrypt(khd)
//
//     pt, err := hd.Decrypt(ct, []byte("context info"))
//     if err != nil {
//         // handle error
//     }
// }

package hybrid

import (
	"fmt"

	"github.com/google/tink/go/core/registry"
)

func init() {
	if err := registry.RegisterKeyManager(newECIESAEADHKDFPrivateKeyKeyManager()); err != nil {
		panic(fmt.Sprintf("hybrid.init() failed: %v", err))
	}
	if err := registry.RegisterKeyManager(newECIESAEADHKDFPublicKeyKeyManager()); err != nil {
		panic(fmt.Sprintf("hybrid.init() failed: %v", err))
	}
}