> For the complete documentation index, see [llms.txt](https://docs.payments.thalescloud.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.payments.thalescloud.io/transit-digitization/ja/d1-transit-api-wosuru/dtawosuru.md).

# 機密データを暗号化する

機密情報をやり取りするために、D1 Transit のバックエンドは標準的な JWE 形式（<https://datatracker.ietf.org/doc/html/rfc7516> ).

機密情報は暗号化前に JSON 形式でエンコードされます。

D1 Transit バックエンドは JWE に対して次の構成を使用します：

* JWE の base64url エンコードされた文字列
* "alg"（アルゴリズム）ヘッダーパラメータ： **ECDH-ES**
* "enc"（暗号化アルゴリズム）ヘッダーパラメータ： **A256GCM**
* "kid"（キー ID）ヘッダーパラメータ：受信者の EC 公開鍵に対応するキー識別子
* EC 曲線： **P-256**

#### 機密データ暗号化の例 <a href="#examples-of-sensitive-data-encryption" id="examples-of-sensitive-data-encryption"></a>

このセクションでは、JWE オブジェクト暗号化のいくつかの例を示します。

**例：** 次のパラメータでカード資格情報を暗号化するには：

| JSON フィールドのパラメータ名 | 説明            | MOC | 長さ    |
| ----------------- | ------------- | --- | ----- |
| pan               | 主口座番号         | M   | 最大19桁 |
| exp               | 有効期限（MMYY 形式） | M   | 4     |

EC 公開鍵：

```json
{
    "kty": "EC",
    "kid": "ASDsL-Jx2XOkRnFtqW-QblWY-mDnQW2LgapadFx75tA",
    "crv": "P-256",
    "x": "UbInEqNbZZZ9SJptBwKTKO6qslSyuWvMkVK44Bx_d8U",
    "y": "PUxeHMNVL0VRxOYJrkHcpe6sap7IG-Are0QborZDngI",
}
```

平文データ：

```json
{
    "pan":"1234567891234567",
    "exp":"1223"
}
```

ソースコードサンプル：

{% tabs %}
{% tab title="node-jose を使った JavaScript" %}

```javascript
const jose = require("node-jose");

const keystore = jose.JWK.createKeyStore();
const publicKey = JSON.stringify({
 "kty": "EC",
 "kid": "ASDsL-Jx2XOkRnFtqW-QblWY-mDnQW2LgapadFx75tA",
 "crv": "P-256",
 "x": "UbInEqNbZZZ9SJptBwKTKO6qslSyuWvMkVK44Bx_d8U",
 "y": "PUxeHMNVL0VRxOYJrkHcpe6sap7IG-Are0QborZDngI",
});
const fields = {
 "alg":"ECDH-ES",
 "enc":"A256GCM",
};
const payload = {
 "pan":"1234567891234567",
 "exp":"1223"
};

(async () => {
 const ecPublicJWK = await keystore.add(publicKey, 'json');
 const encryptedData = await jose.JWE.createEncrypt({ format: "compact", fields}, ecPublicJWK).update(JSON.stringify(payload)).final();
 console.log('encryptedData', encryptedData);
})();

// 出力 : encryptedData eyJhbGciOiJFQ0RILUVTIiwiZW5jIjoiQTI1NkdDTSIsImtpZCI6IkFTRHNMLUp4MlhPa1JuRnRxVy1RYmxXWS1tRG5RVzJMZ2FwYWRGeDc1dEEiLCJlcGsiOnsia3R5IjoiRUMiLCJjcnYiOiJQLTI1NiIsIngiOiJoWGpLdmNWa3d2ZHR4M19sdnJqTmJtQkZfZW9BZjNMeGJCblBNVFJxY2JvIiwieSI6IlJHOEN5WDV5bW9oTGV0cTFhVzgzVG96UU1EaEdQbTNHNXlwZERmVy1mSlUifX0..6L__CO5yA3g4tkLY.HysY-036kmszNeXDdgP375x0NfFlobYYGoL51A5PQ4Js9y287qZZ.QFYcZCfC6JAo1-snZ6O5Cw
```

{% endtab %}

{% tab title="jose4j を使った Java" %}

```java
import java.security.Key;
import java.security.spec.InvalidKeySpecException;
import java.text.ParseException;

import org.jose4j.jwe.ContentEncryptionAlgorithmIdentifiers;
import org.jose4j.jwe.JsonWebEncryption;
import org.jose4j.jwe.KeyManagementAlgorithmIdentifiers;
import org.jose4j.jwk.PublicJsonWebKey;
import org.jose4j.lang.JoseException;

public class testEncryptJWE {

public static void main(String[] args) throws InvalidKeySpecException, JoseException {
	String publicKey = "{\r\n" + "    \"kty\": \"EC\",\r\n"
			+ "    \"kid\": \"ASDsL-Jx2XOkRnFtqW-QblWY-mDnQW2LgapadFx75tA\",\r\n" 
			+ "    \"crv\": \"P-256\",\r\n"
			+ "    \"x\": \"UbInEqNbZZZ9SJptBwKTKO6qslSyuWvMkVK44Bx_d8U\",\r\n"
			+ "    \"y\": \"PUxeHMNVL0VRxOYJrkHcpe6sap7IG-Are0QborZDngI\"\r\n" 
			+ "}";
	String sensitive = "{\r\n" 
			+ "    \"pan\":\"1234567891234567\",\r\n" 
			+ "    \"exp\":\"1223\"\r\n" 
			+ "}";

	PublicJsonWebKey k = PublicJsonWebKey.Factory.newPublicJwk(publicKey);
	Key key = k.getPublicKey();
	JsonWebEncryption jwe = new JsonWebEncryption();
	jwe.setPayload(sensitive);
	jwe.setAlgorithmHeaderValue(KeyManagementAlgorithmIdentifiers.ECDH_ES);
	jwe.setEncryptionMethodHeaderParameter(ContentEncryptionAlgorithmIdentifiers.AES_256_GCM);
	jwe.setKey(key);
	String serializedJwe = jwe.getCompactSerialization();
	System.out.println("Serialized Encrypted JWE: " + serializedJwe);
}
}
// 出力 : Serialized Encrypted JWE: eyJhbGciOiJFQ0RILUVTIiwiZW5jIjoiQTI1NkdDTSIsImVwayI6eyJrdHkiOiJFQyIsIngiOiJiazF2cEFyM3lyZ3REQXVIazRrRnZ1WWVOSFFlM0dYRTcwS1Z3RU4xRTJ3IiwieSI6IjU5dEhKRnBfSHJ5UWFWN1NuTjRKZTFMVmJ1MTYwTGgxS3R1cnVyZWlTNkkiLCJjcnYiOiJQLTI1NiJ9fQ..XAjvjhUrGgQ9zu9u.crUDhRWdvW6J0NbHw2rW8S1Gn9hdLxLwAtkF-FIcR3IaF2P4_VLyQsXjZ544pb83l7x6ols.jtk3rzcjl2sLQFmYZtI7sg
```

{% endtab %}

{% tab title="josekit を使った Rust" %}

```rust
use josekit::{JoseError, jwe::{self, JweHeader, ECDH_ES}};
use std::str;
 
const PUBLIC_KEY: &str = "-----BEGIN PUBLIC KEY-----
MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEUbInEqNbZZZ9SJptBwKTKO6qslSy
uWvMkVK44Bx/d8U9TF4cw1UvRVHE5gmuQdyl7qxqnsgb4Ct7RBuitkOeAg==
-----END PUBLIC KEY-----";
 
const CLEAR_DATA: &str = "{\"pan\":\"1234567891234567\",\"exp\":\"1223\"}";
 
fn main() -> Result<(), JoseError> {

    let encrypter = ECDH_ES.encrypter_from_pem(&PUBLIC_KEY)?;
    let mut header = JweHeader::new();
    header.set_algorithm("ECDH-ES");
    header.set_content_encryption("A256GCM");
    let ciphered_data = jwe::serialize_compact(CLEAR_DATA.as_bytes(), &header, &encrypter)?;
    println!("cipher文データ: {}", &ciphered_data);
 
    Ok(())
}

// 出力: ciphered data: eyJhbGciOiJFQ0RILUVTIiwiZW5jIjoiQTI1NkdDTSIsImVwayI6eyJrdHkiOiJFQyIsImNydiI6IlAtMjU2IiwieCI6Ims5V2UxazAyaGgzeFl1UWJMWm03bDJFX3pSZTQyalVQZXFsRjBhVlZENWciLCJ5IjoiYmgtdnJVOEhUYzZpZlNSVW1TNVByVF85c0tTb0VwQVFGaC1neHY4SW9aUSJ9fQ..eHijOIFaK-t7XhuD.MixYNb6bwnI3It_ul3t2xJLv65toe9EVNoA6hmUGZFzy477XTT5F.GhmSCoCoNKlxCBUH13_D4A
```

{% endtab %}
{% endtabs %}

#### 機密データ復号の例 <a href="#examples-of-sensitive-data-decryption" id="examples-of-sensitive-data-decryption"></a>

このセクションでは、JWE オブジェクト復号のいくつかの例を示します。

{% tabs %}
{% tab title="node-jose を使った JavaScript" %}

```javascript
const jose = require("node-jose");
const jwe = "eyJhbGciOiJFQ0RILUVTIiwiZW5jIjoiQTI1NkdDTSIsImtpZCI6IkFTRHNMLUp4MlhPa1JuRnRxVy1RYmxXWS1tRG5RVzJMZ2FwYWRGeDc1dEEiLCJlcGsiOnsia3R5IjoiRUMiLCJjcnYiOiJQLTI1NiIsIngiOiJoWGpLdmNWa3d2ZHR4M19sdnJqTmJtQkZfZW9BZjNMeGJCblBNVFJxY2JvIiwieSI6IlJHOEN5WDV5bW9oTGV0cTFhVzgzVG96UU1EaEdQbTNHNXlwZERmVy1mSlUifX0..6L__CO5yA3g4tkLY.HysY-036kmszNeXDdgP375x0NfFlobYYGoL51A5PQ4Js9y287qZZ.QFYcZCfC6JAo1-snZ6O5Cw";
const privateKey = "-----BEGIN EC PRIVATE KEY-----\r\nMHcCAQEEIFUvax1cOkuRkKFmypV7FtN5GR+1PjSXJ3yS0yGcn0R7oAoGCCqGSM49\r\nAwEHoUQDQgAEUbInEqNbZZZ9SJptBwKTKO6qslSyuWvMkVK44Bx/d8U9TF4cw1Uv\r\nRVHE5gmuQdyl7qxqnsgb4Ct7RBuitkOeAg==\r\n-----END EC PRIVATE KEY-----";
 
const keystore = jose.JWK.createKeyStore();
 
(async () => {
    const ecJWK = await keystore.add(privateKey, "pem");
    const result = await jose.JWE.createDecrypt(ecJWK).decrypt(jwe);
    console.log("復号結果:", result.plaintext.toString());
})();
 
// 出力：
// Decryption result: {"pan":"1234567891234567","exp":"1223"}
```

{% endtab %}

{% tab title="jose4j を使った Java" %}

```java
import java.security.Key;
import java.security.spec.InvalidKeySpecException;
import java.util.HashMap;
import java.util.Map;

import org.jose4j.jwe.JsonWebEncryption;
import org.jose4j.jwk.EllipticCurveJsonWebKey;
import org.jose4j.lang.JoseException;

public class testEncryptJWE {
public static void main(String[] args) throws InvalidKeySpecException, JoseException {
	Map<String, Object> privateKey = new HashMap<String, Object>();
	privateKey.put("x", "UbInEqNbZZZ9SJptBwKTKO6qslSyuWvMkVK44Bx_d8U");
	privateKey.put("y", "PUxeHMNVL0VRxOYJrkHcpe6sap7IG-Are0QborZDngI");
	privateKey.put("d", "VS9rHVw6S5GQoWbKlXsW03kZH7U-NJcnfJLTIZyfRHs");
	privateKey.put("crv", "P-256");
	privateKey.put("kid", "ASDsL-Jx2XOkRnFtqW-QblWY-mDnQW2LgapadFx75tA");

	EllipticCurveJsonWebKey k = new EllipticCurveJsonWebKey(privateKey);
	Key key = k.getEcPrivateKey();
	String cipheredData = "eyJhbGciOiJFQ0RILUVTIiwiZW5jIjoiQTI1NkdDTSIsImtpZCI6IkFTRHNMLUp4MlhPa1JuRnRxVy1RYmxXWS1tRG5RVzJMZ2FwYWRGeDc1dEEiLCJlcGsiOnsia3R5IjoiRUMiLCJjcnYiOiJQLTI1NiIsIngiOiJoWGpLdmNWa3d2ZHR4M19sdnJqTmJtQkZfZW9BZjNMeGJCblBNVFJxY2JvIiwieSI6IlJHOEN5WDV5bW9oTGV0cTFhVzgzVG96UU1EaEdQbTNHNXlwZERmVy1mSlUifX0..6L__CO5yA3g4tkLY.HysY-036kmszNeXDdgP375x0NfFlobYYGoL51A5PQ4Js9y287qZZ.QFYcZCfC6JAo1-snZ6O5Cw";
	JsonWebEncryption jwe = new JsonWebEncryption();
	jwe.setKey(key);
	jwe.setCompactSerialization(cipheredData);
	System.out.println("復号されたペイロード: " + jwe.getPayload());
  }
}
// 出力: Decrypted payload: {"pan":"1234567891234567","exp":"1223"}
```

{% endtab %}

{% tab title="josekit を使った Rust" %}

```rust
use josekit::{JoseError, jwe::{self, ECDH_ES}};
use std::str;
 
const PRIVATE_KEY: &str = "-----BEGIN EC PRIVATE KEY-----
MHcCAQEEIFUvax1cOkuRkKFmypV7FtN5GR+1PjSXJ3yS0yGcn0R7oAoGCCqGSM49
AwEHoUQDQgAEUbInEqNbZZZ9SJptBwKTKO6qslSyuWvMkVK44Bx/d8U9TF4cw1Uv
RVHE5gmuQdyl7qxqnsgb4Ct7RBuitkOeAg==
-----END EC PRIVATE KEY-----";
 
const JWE_FROM_SAMPLE: &str = "eyJhbGciOiJFQ0RILUVTIiwiZW5jIjoiQTI1NkdDTSIsImtpZCI6IkFTRHNMLUp4MlhPa1JuRnRxVy1RYmxXWS1tRG5RVzJMZ2FwYWRGeDc1dEEiLCJlcGsiOnsia3R5IjoiRUMiLCJjcnYiOiJQLTI1NiIsIngiOiJoWGpLdmNWa3d2ZHR4M19sdnJqTmJtQkZfZW9BZjNMeGJCblBNVFJxY2JvIiwieSI6IlJHOEN5WDV5bW9oTGV0cTFhVzgzVG96UU1EaEdQbTNHNXlwZERmVy1mSlUifX0..6L__CO5yA3g4tkLY.HysY-036kmszNeXDdgP375x0NfFlobYYGoL51A5PQ4Js9y287qZZ.QFYcZCfC6JAo1-snZ6O5Cw";
 
fn main() -> Result<(), JoseError> {
    let decrypter = ECDH_ES.decrypter_from_pem(&PRIVATE_KEY)?;
    let (payload, _) = jwe::deserialize_compact(&JWE_FROM_SAMPLE, &decrypter)?;
    println!("復号されたペイロード: {}", str::from_utf8(&payload).unwrap());
 
    Ok(())
}
 
// 出力：
// 復号されたペイロード: {"pan":"1234567891234567","exp":"1223"}
```

{% endtab %}
{% endtabs %}


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