Use cosmosDB in the gateway and encrypt data with encryption key generated inside the enclave #2104
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,12 +1,13 @@ | ||
| package common | ||
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| type GWUserDB struct { | ||
| UserId []byte `json:"userId"` | ||
| PrivateKey []byte `json:"privateKey"` | ||
| Accounts []GWAccountDB `json:"accounts"` | ||
| } | ||
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| type GWAccountDB struct { | ||
| AccountAddress []byte `json:"accountAddress"` | ||
| Signature []byte `json:"signature"` | ||
| SignatureType int `json:"signatureType"` | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,65 @@ | ||
| package encryption | ||
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| import ( | ||
| "crypto/aes" | ||
| "crypto/cipher" | ||
| "crypto/hmac" | ||
| "crypto/rand" | ||
| "crypto/sha256" | ||
| "errors" | ||
| "fmt" | ||
| "io" | ||
| ) | ||
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| // Encryptor provides AES-GCM encryption/decryption with the following characteristics: | ||
| // - Uses AES-256-GCM (Galois/Counter Mode) with a 32-byte key | ||
| // - Generates a random 12-byte nonce for each encryption operation using crypto/rand | ||
| // - The nonce is prepended to the ciphertext output from Encrypt() and is generated | ||
| // using crypto/rand.Reader for cryptographically secure random values | ||
| // | ||
| // Additionally provides HMAC-SHA256 hashing functionality: | ||
| // - Uses the same 32-byte key as the encryption operations | ||
| // - Generates a 32-byte (256-bit) message authentication code | ||
| // - Suitable for creating secure message digests and verifying data integrity | ||
| type Encryptor struct { | ||
| gcm cipher.AEAD | ||
| key []byte | ||
| } | ||
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| func NewEncryptor(key []byte) (*Encryptor, error) { | ||
| if len(key) != 32 { | ||
| return nil, fmt.Errorf("key must be 32 bytes long") | ||
| } | ||
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| block, err := aes.NewCipher(key) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| gcm, err := cipher.NewGCM(block) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return &Encryptor{gcm: gcm, key: key}, nil | ||
| } | ||
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| func (e *Encryptor) Encrypt(plaintext []byte) ([]byte, error) { | ||
| nonce := make([]byte, e.gcm.NonceSize()) | ||
| if _, err := io.ReadFull(rand.Reader, nonce); err != nil { | ||
| return nil, err | ||
| } | ||
| return e.gcm.Seal(nonce, nonce, plaintext, nil), nil | ||
| } | ||
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| func (e *Encryptor) Decrypt(ciphertext []byte) ([]byte, error) { | ||
| if len(ciphertext) < e.gcm.NonceSize() { | ||
| return nil, errors.New("ciphertext too short") | ||
| } | ||
| nonce, ciphertext := ciphertext[:e.gcm.NonceSize()], ciphertext[e.gcm.NonceSize():] | ||
| return e.gcm.Open(nil, nonce, ciphertext, nil) | ||
| } | ||
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| func (e *Encryptor) HashWithHMAC(data []byte) []byte { | ||
| h := hmac.New(sha256.New, e.key) | ||
|
There was a problem hiding this comment. this should not be reused (it has it's internal state and by reusing we might get different outputs) |
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| h.Write(data) | ||
| return h.Sum(nil) | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,115 @@ | ||
| package encryption | ||
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| import ( | ||
| "bytes" | ||
| "crypto/rand" | ||
| "testing" | ||
| ) | ||
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| func TestNewEncryptor(t *testing.T) { | ||
| key := make([]byte, 32) // 256-bit key | ||
| _, err := rand.Read(key) | ||
| if err != nil { | ||
| t.Fatalf("Failed to generate random key: %v", err) | ||
| } | ||
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| encryptor, err := NewEncryptor(key) | ||
| if err != nil { | ||
| t.Fatalf("NewEncryptor failed: %v", err) | ||
| } | ||
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| if encryptor == nil { | ||
| t.Fatal("NewEncryptor returned nil") | ||
| } | ||
| } | ||
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| func TestEncryptDecrypt(t *testing.T) { | ||
| key := make([]byte, 32) // 256-bit key | ||
| _, err := rand.Read(key) | ||
| if err != nil { | ||
| t.Fatalf("Failed to generate random key: %v", err) | ||
| } | ||
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| encryptor, err := NewEncryptor(key) | ||
| if err != nil { | ||
| t.Fatalf("NewEncryptor failed: %v", err) | ||
| } | ||
|
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| plaintext := []byte("Hello, World!") | ||
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| ciphertext, err := encryptor.Encrypt(plaintext) | ||
| if err != nil { | ||
| t.Fatalf("Encryption failed: %v", err) | ||
| } | ||
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| decrypted, err := encryptor.Decrypt(ciphertext) | ||
| if err != nil { | ||
| t.Fatalf("Decryption failed: %v", err) | ||
| } | ||
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| if !bytes.Equal(plaintext, decrypted) { | ||
| t.Fatalf("Decrypted text does not match original plaintext") | ||
| } | ||
| } | ||
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| func TestEncryptDecryptEmptyString(t *testing.T) { | ||
| key := make([]byte, 32) // 256-bit key | ||
| _, err := rand.Read(key) | ||
| if err != nil { | ||
| t.Fatalf("Failed to generate random key: %v", err) | ||
| } | ||
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| encryptor, err := NewEncryptor(key) | ||
| if err != nil { | ||
| t.Fatalf("NewEncryptor failed: %v", err) | ||
| } | ||
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| plaintext := []byte("") | ||
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| ciphertext, err := encryptor.Encrypt(plaintext) | ||
| if err != nil { | ||
| t.Fatalf("Encryption of empty string failed: %v", err) | ||
| } | ||
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| decrypted, err := encryptor.Decrypt(ciphertext) | ||
| if err != nil { | ||
| t.Fatalf("Decryption of empty string failed: %v", err) | ||
| } | ||
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| if !bytes.Equal(plaintext, decrypted) { | ||
| t.Fatalf("Decrypted empty string does not match original") | ||
| } | ||
| } | ||
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| func TestDecryptInvalidCiphertext(t *testing.T) { | ||
| key := make([]byte, 32) // 256-bit key | ||
| _, err := rand.Read(key) | ||
| if err != nil { | ||
| t.Fatalf("Failed to generate random key: %v", err) | ||
| } | ||
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| encryptor, err := NewEncryptor(key) | ||
| if err != nil { | ||
| t.Fatalf("NewEncryptor failed: %v", err) | ||
| } | ||
|
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| invalidCiphertext := []byte("This is not a valid ciphertext") | ||
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| _, err = encryptor.Decrypt(invalidCiphertext) | ||
| if err == nil { | ||
| t.Fatal("Decryption of invalid ciphertext should have failed, but didn't") | ||
| } | ||
| } | ||
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| func TestNewEncryptorInvalidKeySize(t *testing.T) { | ||
| invalidKey := make([]byte, 31) // Invalid key size (not 16, 24, or 32 bytes) | ||
| _, err := rand.Read(invalidKey) | ||
| if err != nil { | ||
| t.Fatalf("Failed to generate random key: %v", err) | ||
| } | ||
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| _, err = NewEncryptor(invalidKey) | ||
| if err == nil { | ||
| t.Fatal("NewEncryptor should have failed with invalid key size, but didn't") | ||
| } | ||
| } |
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please add a good comment describing the encryption approach. AES-GCM with key size, nonce size. How we generate a nonce for each.
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added a comment
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thanks.