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Merge pull request #86 from capeprivacy/gavinuhma/hpke
Replace Tink with Circl/hpke
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,32 +1,39 @@ | ||
| package crypto | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "crypto/rand" | ||
| "fmt" | ||
|
|
||
| "github.com/google/tink/go/hybrid" | ||
| "github.com/google/tink/go/keyset" | ||
| "github.com/cloudflare/circl/hpke" | ||
|
|
||
| "github.com/capeprivacy/cli/attest" | ||
| ) | ||
|
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| func LocalEncrypt(doc attest.AttestationDoc, plaintext []byte) ([]byte, error) { | ||
| buf := bytes.NewBuffer(doc.PublicKey) | ||
| reader := keyset.NewBinaryReader(buf) | ||
| khPub, err := keyset.ReadWithNoSecrets(reader) | ||
| kemID := hpke.KEM_X25519_HKDF_SHA256 | ||
| kdfID := hpke.KDF_HKDF_SHA256 | ||
| aeadID := hpke.AEAD_ChaCha20Poly1305 | ||
| suite := hpke.NewSuite(kemID, kdfID, aeadID) | ||
|
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| kemPublicKey, err := kemID.Scheme().UnmarshalBinaryPublicKey(doc.PublicKey) | ||
| if err != nil { | ||
| fmt.Println(err) | ||
| } | ||
|
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| sender, err := suite.NewSender(kemPublicKey, nil) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("read pubic key %s", err) | ||
| return nil, fmt.Errorf("unable to encrypt %s", err) | ||
| } | ||
|
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| encrypt, err := hybrid.NewHybridEncrypt(khPub) | ||
| encapsulatedKey, sealer, err := sender.Setup(rand.Reader) | ||
| if err != nil { | ||
| return nil, err | ||
| return nil, fmt.Errorf("unable to encrypt %s", err) | ||
| } | ||
|
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||
| ciphertext, err := encrypt.Encrypt(plaintext, nil) | ||
| ciphertext, err := sealer.Seal(plaintext, nil) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("unable to encrypt %s", err) | ||
| } | ||
|
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||
| return ciphertext, nil | ||
| return append(encapsulatedKey, ciphertext...), nil | ||
| } |
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