本文為英文版的機器翻譯版本，如內容有任何歧義或不一致之處，概以英文版為準。

# 原始 ECDH keyring
<a name="use-raw-ecdh-keyring"></a>

原始 ECDH keyring 會使用您提供的橢圓曲線公有/私有金鑰對，在兩方之間衍生共用包裝金鑰。首先， keyring 會使用寄件者的私有金鑰、收件人的公有金鑰和橢圓曲線 Diffie-Hellman (ECDH) 金鑰協議演算法衍生共用秘密。然後， keyring 會使用共用秘密來衍生保護資料加密金鑰的共用包裝金鑰。 AWS Encryption SDK 用來衍生共用包裝金鑰的金鑰衍生函數 (`KDF_CTR_HMAC_SHA384`) 符合[金鑰衍生的 NIST 建議](https://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-108r1-upd1.pdf)。

金鑰衍生函數會傳回 64 個位元組的金鑰材料。為了確保雙方都使用正確的金鑰材料， AWS Encryption SDK 會使用前 32 個位元組做為承諾金鑰，最後 32 個位元組做為共用包裝金鑰。在解密時，如果 keyring 無法重現存放在訊息標頭加密文字上的相同承諾金鑰和共用包裝金鑰，則操作會失敗。例如，如果您使用以 **Alice** 私有金鑰和 **Bob** 公有金鑰設定的 keyring 加密資料，則以 **Bob **私有金鑰和 **Alice 公**有金鑰設定的 keyring 將重現相同的承諾金鑰和共用包裝金鑰，並能夠解密資料。如果 Bob 的公有金鑰來自 AWS KMS key 對，則 Bob 可以建立 [AWS KMS ECDH keyring](use-kms-ecdh-keyring.md) 來解密資料。

原始 ECDH keyring 使用 AES-GCM 使用對稱金鑰加密資料。然後，資料金鑰會使用 AES-GCM 使用衍生的共用包裝金鑰進行信封加密。每個原始 ECDH keyring 只能有一個共用包裝金鑰，但您可以在多 keyring 中單獨包含多個原始 ECDH keyring 或與其他 [keyring ](use-multi-keyring.md)一起包含。

您負責產生、儲存和保護您的私有金鑰，最好是在硬體安全模組 (HSM) 或金鑰管理系統中。寄件者和收件人的金鑰對大多位於相同的橢圓曲線上。 AWS Encryption SDK 支援下列橢圓曲線規格：
+ `ECC_NIST_P256`
+ `ECC_NIST_P384`
+ `ECC_NIST_P512`

**程式設計語言相容性**  
原始 ECDH keyring 會在 [Cryptographic Material Providers Library](https://github.com/aws/aws-cryptographic-material-providers-library) (MPL) 的 1.5.0 版中推出，並受下列程式設計語言和版本支援：
+ 3.*x* 版 適用於 JAVA 的 AWS Encryption SDK
+  AWS Encryption SDK 適用於 .NET 的 4.*x* 版和更新版本
+ 4.*x* 版 適用於 Python 的 AWS Encryption SDK，與選用的 MPL 相依性搭配使用時。
+ for Rust 1.*x* AWS Encryption SDK 版
+ 適用於 Go 的 0.1.*x* AWS Encryption SDK 版或更新版本

## 建立原始 ECDH keyring
<a name="raw-ecdh-create"></a>

原始 ECDH keyring 支援三個金鑰協議結構描述：`RawPrivateKeyToStaticPublicKey`、 `EphemeralPrivateKeyToStaticPublicKey`和 `PublicKeyDiscovery`。您選取的金鑰協議結構描述會決定您可以執行哪些密碼編譯操作，以及如何組合金鑰材料。

**Topics**
+ [RawPrivateKeyToStaticPublicKey](#raw-ecdh-RawPrivateKeyToStaticPublicKey)
+ [EphemeralPrivateKeyToStaticPublicKey](#raw-ecdh-EphemeralPrivateKeyToStaticPublicKey)
+ [PublicKeyDiscovery](#raw-ecdh-PublicKeyDiscovery)

### RawPrivateKeyToStaticPublicKey
<a name="raw-ecdh-RawPrivateKeyToStaticPublicKey"></a>

使用`RawPrivateKeyToStaticPublicKey`金鑰協議結構描述，在 keyring 中靜態設定寄件者的私有金鑰和收件人的公有金鑰。此金鑰協議結構描述可以加密和解密資料。

若要使用`RawPrivateKeyToStaticPublicKey`金鑰協議結構描述初始化原始 ECDH keyring，請提供下列值：
+ **寄件者的私有金鑰**

  您必須提供寄件者的 PEM 編碼私有金鑰 (PKCS \#8 PrivateKeyInfo 結構），如 [RFC 5958 ](https://tools.ietf.org/html/rfc5958#section-2)所定義。
+ **收件人的公有金鑰**

  您必須提供收件人的 DER 編碼 X.509 公有金鑰，也稱為 `SubjectPublicKeyInfo`(SPKI)，如 [RFC 5280 ](https://tools.ietf.org/html/rfc5280)所定義。

  您可以指定非對稱金鑰協議 KMS 金鑰對的公有金鑰，或從外部產生的金鑰對的公有金鑰 AWS。
+ **曲線規格**

  識別指定金鑰對中的橢圓曲線規格。寄件者和收件人的金鑰對必須具有相同的曲線規格。

  有效值：`ECC_NIST_P256`、`ECC_NIS_P384`、`ECC_NIST_P512`

------
#### [ C\# / .NET ]

```
// Instantiate material providers
var materialProviders = new MaterialProviders(new MaterialProvidersConfig());
	    var BobPrivateKey = new MemoryStream(new byte[] { });
	    var AlicePublicKey = new MemoryStream(new byte[] { });

	    // Create the Raw ECDH static keyring
	    var staticConfiguration = new RawEcdhStaticConfigurations()
	    {
		    RawPrivateKeyToStaticPublicKey = new RawPrivateKeyToStaticPublicKeyInput
		    {
			    SenderStaticPrivateKey = BobPrivateKey,
			    RecipientPublicKey = AlicePublicKey
		    }
	    };
	    
	    var createKeyringInput = new CreateRawEcdhKeyringInput() 
	    {
		    CurveSpec = ECDHCurveSpec.{{ECC_NIST_P256}},
		    KeyAgreementScheme = staticConfiguration 
	    };

	    var keyring = materialProviders.CreateRawEcdhKeyring(createKeyringInput);
```

------
#### [ Java ]

下列 Java 範例使用`RawPrivateKeyToStaticPublicKey`金鑰協議結構描述來靜態設定寄件者的私有金鑰和收件人的公有金鑰。兩個金鑰對都在`ECC_NIST_P256`曲線上。

```
private static void StaticRawKeyring() {
    // Instantiate material providers
    final MaterialProviders materialProviders =
      MaterialProviders.builder()
        .MaterialProvidersConfig(MaterialProvidersConfig.builder().build())
        .build();

    KeyPair senderKeys = GetRawEccKey();
    KeyPair recipient = GetRawEccKey();

    // Create the Raw ECDH static keyring
    final CreateRawEcdhKeyringInput rawKeyringInput =
      CreateRawEcdhKeyringInput.builder()
        .curveSpec(ECDHCurveSpec.{{ECC_NIST_P256}})
        .KeyAgreementScheme(
          RawEcdhStaticConfigurations.builder()
            .RawPrivateKeyToStaticPublicKey(
                RawPrivateKeyToStaticPublicKeyInput.builder()
                  // Must be a PEM-encoded private key
                  .senderStaticPrivateKey(ByteBuffer.wrap(senderKeys.getPrivate().getEncoded()))
                  // Must be a DER-encoded X.509 public key
                  .recipientPublicKey(ByteBuffer.wrap(recipient.getPublic().getEncoded()))
                  .build()
            )
            .build()
        ).build();

    final IKeyring staticKeyring = materialProviders.CreateRawEcdhKeyring(rawKeyringInput);
}
```

------
#### [ Python ]

下列 Python 範例使用`RawEcdhStaticConfigurationsRawPrivateKeyToStaticPublicKey`金鑰協議結構描述來靜態設定寄件者的私有金鑰和收件人的公有金鑰。兩個金鑰對都在`ECC_NIST_P256`曲線上。

```
import boto3
from aws_cryptographic_materialproviders.mpl.models import (
    CreateRawEcdhKeyringInput,
    RawEcdhStaticConfigurationsRawPrivateKeyToStaticPublicKey,
    RawPrivateKeyToStaticPublicKeyInput,
)
from aws_cryptography_primitives.smithygenerated.aws_cryptography_primitives.models import ECDHCurveSpec

# Instantiate the material providers library
mat_prov: AwsCryptographicMaterialProviders = AwsCryptographicMaterialProviders(
    config=MaterialProvidersConfig()
)

# Must be a PEM-encoded private key
bob_private_key = get_private_key_bytes()
# Must be a DER-encoded X.509 public key
alice_public_key = get_public_key_bytes()

# Create the raw ECDH static keyring
raw_keyring_input = CreateRawEcdhKeyringInput(
    curve_spec = ECDHCurveSpec.{{ECC_NIST_P256}},
    key_agreement_scheme = RawEcdhStaticConfigurationsRawPrivateKeyToStaticPublicKey(
        RawPrivateKeyToStaticPublicKeyInput(
            sender_static_private_key = bob_private_key,
            recipient_public_key = alice_public_key,
        )
    )
)

keyring = mat_prov.create_raw_ecdh_keyring(raw_keyring_input)
```

------
#### [ Rust ]

下列 Python 範例使用`raw_ecdh_static_configuration`金鑰協議結構描述來靜態設定寄件者的私有金鑰和收件人的公有金鑰。兩個金鑰對必須位於相同的曲線上。

```
// Instantiate the AWS Encryption SDK client
let esdk_config = AwsEncryptionSdkConfig::builder().build()?;
let esdk_client = esdk_client::Client::from_conf(esdk_config)?;

// Optional: Create your encryption context
let encryption_context = HashMap::from([
    ("encryption".to_string(), "context".to_string()),
    ("is not".to_string(), "secret".to_string()),
    ("but adds".to_string(), "useful metadata".to_string()),
    ("that can help you".to_string(), "be confident that".to_string()),
    ("the data you are handling".to_string(), "is what you think it is".to_string()),
]);

// Create keyring input
let raw_ecdh_static_configuration_input =
    RawPrivateKeyToStaticPublicKeyInput::builder()
        // Must be a UTF8 PEM-encoded private key
        .sender_static_private_key(private_key_sender_utf8_bytes)
        // Must be a UTF8 DER-encoded X.509 public key
        .recipient_public_key(public_key_recipient_utf8_bytes)
        .build()?;

let raw_ecdh_static_configuration = RawEcdhStaticConfigurations::RawPrivateKeyToStaticPublicKey(raw_ecdh_static_configuration_input);

// Instantiate the material providers library
let mpl_config = MaterialProvidersConfig::builder().build()?;
let mpl = mpl_client::Client::from_conf(mpl_config)?;

// Create raw ECDH static keyring
let raw_ecdh_keyring = mpl
    .create_raw_ecdh_keyring()
    .curve_spec(ecdh_curve_spec)
    .key_agreement_scheme(raw_ecdh_static_configuration)
    .send()
    .await?;
```

------
#### [ Go ]

```
import (
    "context"
    
	mpl "aws/aws-cryptographic-material-providers-library/releases/go/mpl/awscryptographymaterialproviderssmithygenerated"
	mpltypes "aws/aws-cryptographic-material-providers-library/releases/go/mpl/awscryptographymaterialproviderssmithygeneratedtypes"
	client "github.com/aws/aws-encryption-sdk/awscryptographyencryptionsdksmithygenerated"
	esdktypes "github.com/aws/aws-encryption-sdk/awscryptographyencryptionsdksmithygeneratedtypes"
)

// Instantiate the AWS Encryption SDK client
encryptionClient, err := client.NewClient(esdktypes.AwsEncryptionSdkConfig{})
if err != nil {
    panic(err)
}

// Optional: Create your encryption context
encryptionContext := map[string]string{
    "encryption":                "context",
    "is not":                    "secret",
    "but adds":                  "useful metadata",
    "that can help you":         "be confident that",
    "the data you are handling": "is what you think it is",
}

// Create keyring input
rawEcdhStaticConfigurationInput := mpltypes.RawPrivateKeyToStaticPublicKeyInput{
    SenderStaticPrivateKey: privateKeySender,
    RecipientPublicKey:     publicKeyRecipient,
}
rawECDHStaticConfiguration := &mpltypes.RawEcdhStaticConfigurationsMemberRawPrivateKeyToStaticPublicKey{
    Value: rawEcdhStaticConfigurationInput,
}
rawEcdhKeyRingInput := mpltypes.CreateRawEcdhKeyringInput{
    CurveSpec:          ecdhCurveSpec,
    KeyAgreementScheme: rawECDHStaticConfiguration,
}

// Instantiate the material providers library
matProv, err := mpl.NewClient(mpltypes.MaterialProvidersConfig{})
if err != nil {
    panic(err)
}

// Create raw ECDH static keyring
rawEcdhKeyring, err := matProv.CreateRawEcdhKeyring(context.Background(), rawEcdhKeyRingInput)
if err != nil {
    panic(err)
}
```

------

### EphemeralPrivateKeyToStaticPublicKey
<a name="raw-ecdh-EphemeralPrivateKeyToStaticPublicKey"></a>

使用`EphemeralPrivateKeyToStaticPublicKey`金鑰協議結構描述設定的 keyring 會在本機建立新的金鑰對，並針對每個加密呼叫衍生唯一的共用包裝金鑰。

此金鑰協議結構描述只能加密訊息。若要解密使用`EphemeralPrivateKeyToStaticPublicKey`金鑰協議結構描述加密的訊息，您必須使用以相同收件人的公有金鑰設定的探索金鑰協議結構描述。若要解密，您可以使用原始 ECDH keyring 搭配[`PublicKeyDiscovery`](#raw-ecdh-PublicKeyDiscovery)金鑰協議演算法，或者，如果收件人的公有金鑰來自非對稱金鑰協議 KMS 金鑰對，您可以使用 AWS KMS ECDH keyring 搭配 [KmsPublicKeyDiscovery](use-kms-ecdh-keyring.md#kms-ecdh-discovery) 金鑰協議結構描述。

若要使用`EphemeralPrivateKeyToStaticPublicKey`金鑰協議結構描述初始化原始 ECDH keyring，請提供下列值：
+ **收件人的公有金鑰**

  您必須提供收件人的 DER 編碼 X.509 公有金鑰，也稱為 `SubjectPublicKeyInfo`(SPKI)，如 [RFC 5280 ](https://tools.ietf.org/html/rfc5280)所定義。

  您可以指定非對稱金鑰協議 KMS 金鑰對的公有金鑰，或從外部產生的金鑰對的公有金鑰 AWS。
+ **曲線規格**

  識別指定公有金鑰中的橢圓曲線規格。

  加密時， keyring 會在指定的曲線上建立新的金鑰對，並使用新的私有金鑰和指定的公有金鑰來衍生共用包裝金鑰。

  有效值：`ECC_NIST_P256`、`ECC_NIS_P384`、`ECC_NIST_P512`

------
#### [ C\# / .NET ]

下列範例會使用`EphemeralPrivateKeyToStaticPublicKey`金鑰協議結構描述建立原始 ECDH keyring。加密時， keyring 將在指定的`ECC_NIST_P256`曲線上於本機建立新的金鑰對。

```
// Instantiate material providers
var materialProviders = new MaterialProviders(new MaterialProvidersConfig());
	    var AlicePublicKey = new MemoryStream(new byte[] { });

	    // Create the Raw ECDH ephemeral keyring
	    var ephemeralConfiguration = new RawEcdhStaticConfigurations()
	    {
		    EphemeralPrivateKeyToStaticPublicKey = new EphemeralPrivateKeyToStaticPublicKeyInput
		    {
			    RecipientPublicKey = AlicePublicKey
		    }
	    };
	    
	    var createKeyringInput = new CreateRawEcdhKeyringInput() 
	    {
		    CurveSpec = ECDHCurveSpec.{{ECC_NIST_P256}},
		    KeyAgreementScheme = ephemeralConfiguration
	    };

	    var keyring = materialProviders.CreateRawEcdhKeyring(createKeyringInput);
```

------
#### [ Java ]

下列範例會使用`EphemeralPrivateKeyToStaticPublicKey`金鑰協議結構描述建立原始 ECDH keyring。加密時， keyring 將在指定的`ECC_NIST_P256`曲線上於本機建立新的金鑰對。

```
private static void EphemeralRawEcdhKeyring() {
    // Instantiate material providers
    final MaterialProviders materialProviders =
      MaterialProviders.builder()
        .MaterialProvidersConfig(MaterialProvidersConfig.builder().build())
        .build();

    ByteBuffer recipientPublicKey = getPublicKeyBytes();

    // Create the Raw ECDH ephemeral keyring
    final CreateRawEcdhKeyringInput ephemeralInput =
      CreateRawEcdhKeyringInput.builder()
        .curveSpec(ECDHCurveSpec.{{ECC_NIST_P256}})
        .KeyAgreementScheme(
          RawEcdhStaticConfigurations.builder()
            .EphemeralPrivateKeyToStaticPublicKey(
              EphemeralPrivateKeyToStaticPublicKeyInput.builder()
                .recipientPublicKey(recipientPublicKey)
                .build()
            )
            .build()
        ).build();

    final IKeyring ephemeralKeyring = materialProviders.CreateRawEcdhKeyring(ephemeralInput);
}
```

------
#### [ Python ]

下列範例會使用`RawEcdhStaticConfigurationsEphemeralPrivateKeyToStaticPublicKey`金鑰協議結構描述建立原始 ECDH keyring。加密時， keyring 將在指定的`ECC_NIST_P256`曲線上於本機建立新的金鑰對。

```
import boto3
from aws_cryptographic_materialproviders.mpl.models import (
    CreateRawEcdhKeyringInput,
    RawEcdhStaticConfigurationsEphemeralPrivateKeyToStaticPublicKey,
    EphemeralPrivateKeyToStaticPublicKeyInput,
)
from aws_cryptography_primitives.smithygenerated.aws_cryptography_primitives.models import ECDHCurveSpec

# Instantiate the material providers library
mat_prov: AwsCryptographicMaterialProviders = AwsCryptographicMaterialProviders(
    config=MaterialProvidersConfig()
)

# Your get_public_key_bytes must return a DER-encoded X.509 public key
recipient_public_key = get_public_key_bytes()

# Create the raw ECDH ephemeral private key keyring
ephemeral_input = CreateRawEcdhKeyringInput(
    curve_spec = ECDHCurveSpec.{{ECC_NIST_P256}},
    key_agreement_scheme = RawEcdhStaticConfigurationsEphemeralPrivateKeyToStaticPublicKey(
        EphemeralPrivateKeyToStaticPublicKeyInput(
            recipient_public_key = recipient_public_key,
        )
    )
)

keyring = mat_prov.create_raw_ecdh_keyring(ephemeral_input)
```

------
#### [ Rust ]

下列範例會使用`ephemeral_raw_ecdh_static_configuration`金鑰協議結構描述建立原始 ECDH keyring。加密時， keyring 將在指定的曲線上於本機建立新的金鑰對。

```
// Instantiate the AWS Encryption SDK client
let esdk_config = AwsEncryptionSdkConfig::builder().build()?;
let esdk_client = esdk_client::Client::from_conf(esdk_config)?;

// Optional: Create your encryption context
let encryption_context = HashMap::from([
    ("encryption".to_string(), "context".to_string()),
    ("is not".to_string(), "secret".to_string()),
    ("but adds".to_string(), "useful metadata".to_string()),
    ("that can help you".to_string(), "be confident that".to_string()),
    ("the data you are handling".to_string(), "is what you think it is".to_string()),
]);

// Load public key from UTF-8 encoded PEM files into a DER encoded public key.
let public_key_file_content = std::fs::read_to_string(Path::new(EXAMPLE_ECC_PUBLIC_KEY_FILENAME_RECIPIENT))?;
let parsed_public_key_file_content = parse(public_key_file_content)?;
let public_key_recipient_utf8_bytes = parsed_public_key_file_content.contents();

// Create EphemeralPrivateKeyToStaticPublicKeyInput
let ephemeral_raw_ecdh_static_configuration_input =
    EphemeralPrivateKeyToStaticPublicKeyInput::builder()
        // Must be a UTF8 DER-encoded X.509 public key
        .recipient_public_key(public_key_recipient_utf8_bytes)
        .build()?;

let ephemeral_raw_ecdh_static_configuration =
    RawEcdhStaticConfigurations::EphemeralPrivateKeyToStaticPublicKey(ephemeral_raw_ecdh_static_configuration_input);

// Instantiate the material providers library
let mpl_config = MaterialProvidersConfig::builder().build()?;
let mpl = mpl_client::Client::from_conf(mpl_config)?;

// Create raw ECDH ephemeral private key keyring
let ephemeral_raw_ecdh_keyring = mpl
    .create_raw_ecdh_keyring()
    .curve_spec(ecdh_curve_spec)
    .key_agreement_scheme(ephemeral_raw_ecdh_static_configuration)
    .send()
    .await?;
```

------
#### [ Go ]

```
import (
    "context"
    
	mpl "aws/aws-cryptographic-material-providers-library/releases/go/mpl/awscryptographymaterialproviderssmithygenerated"
	mpltypes "aws/aws-cryptographic-material-providers-library/releases/go/mpl/awscryptographymaterialproviderssmithygeneratedtypes"
	client "github.com/aws/aws-encryption-sdk/awscryptographyencryptionsdksmithygenerated"
	esdktypes "github.com/aws/aws-encryption-sdk/awscryptographyencryptionsdksmithygeneratedtypes"
)

// Instantiate the AWS Encryption SDK client
encryptionClient, err := client.NewClient(esdktypes.AwsEncryptionSdkConfig{})
if err != nil {
    panic(err)
}

// Optional: Create your encryption context
encryptionContext := map[string]string{
    "encryption":                "context",
    "is not":                    "secret",
    "but adds":                  "useful metadata",
    "that can help you":         "be confident that",
    "the data you are handling": "is what you think it is",
}

// Load public key from UTF-8 encoded PEM files into a DER encoded public key
publicKeyRecipient, err := LoadPublicKeyFromPEM(eccPublicKeyFileNameRecipient)
if err != nil {
    panic(err)
}

// Create EphemeralPrivateKeyToStaticPublicKeyInput
ephemeralRawEcdhStaticConfigurationInput := mpltypes.EphemeralPrivateKeyToStaticPublicKeyInput{
    RecipientPublicKey: publicKeyRecipient,
}
ephemeralRawECDHStaticConfiguration :=
    mpltypes.RawEcdhStaticConfigurationsMemberEphemeralPrivateKeyToStaticPublicKey{
        Value: ephemeralRawEcdhStaticConfigurationInput,
    }

// Instantiate the material providers library
matProv, err := mpl.NewClient(mpltypes.MaterialProvidersConfig{})
if err != nil {
    panic(err)
}

// Create raw ECDH ephemeral private key keyring
rawEcdhKeyRingInput := mpltypes.CreateRawEcdhKeyringInput{
    CurveSpec:          ecdhCurveSpec,
    KeyAgreementScheme: &ephemeralRawECDHStaticConfiguration,
}
ecdhKeyring, err := matProv.CreateRawEcdhKeyring(context.Background(), rawEcdhKeyRingInput)
if err != nil {
    panic(err)
}
```

------

### PublicKeyDiscovery
<a name="raw-ecdh-PublicKeyDiscovery"></a>

解密時，最佳實務是指定 AWS Encryption SDK 可以使用的包裝金鑰。若要遵循此最佳實務，請使用指定寄件者私有金鑰和收件人公有金鑰的 ECDH keyring。不過，您也可以建立原始 ECDH 探索 keyring，也就是原始 ECDH keyring，可解密指定金鑰的公有金鑰與存放在訊息加密文字上的收件人公有金鑰相符的任何訊息。此金鑰協議結構描述只能解密訊息。

**重要**  
當您使用`PublicKeyDiscovery`金鑰協議結構描述解密訊息時，您接受所有公有金鑰，無論誰擁有它。

若要使用`PublicKeyDiscovery`金鑰協議結構描述初始化原始 ECDH keyring，請提供下列值：
+ **收件人的靜態私有金鑰**

  您必須提供收件人的 PEM 編碼私有金鑰 (PKCS \#8 PrivateKeyInfo 結構），如 [RFC 5958 ](https://tools.ietf.org/html/rfc5958#section-2)所定義。
+ **曲線規格**

  識別指定私有金鑰中的橢圓曲線規格。寄件者和收件人的金鑰對必須具有相同的曲線規格。

  有效值：`ECC_NIST_P256`、`ECC_NIS_P384`、`ECC_NIST_P512`

------
#### [ C\# / .NET ]

下列範例會使用`PublicKeyDiscovery`金鑰協議結構描述建立原始 ECDH keyring。此 keyring 可以解密任何訊息，其中指定的私有金鑰的公有金鑰符合存放在訊息加密文字上的收件人公有金鑰。

```
// Instantiate material providers
var materialProviders = new MaterialProviders(new MaterialProvidersConfig());
	    var AlicePrivateKey = new MemoryStream(new byte[] { });

	    // Create the Raw ECDH discovery keyring
	    var discoveryConfiguration = new RawEcdhStaticConfigurations()
	    {
		    PublicKeyDiscovery = new PublicKeyDiscoveryInput
		    {
			    RecipientStaticPrivateKey = AlicePrivateKey
		    }
	    };
	    
	    var createKeyringInput = new CreateRawEcdhKeyringInput() 
	    {
		    CurveSpec = ECDHCurveSpec.ECC_NIST_P256,
		    KeyAgreementScheme = discoveryConfiguration 
	    };

	    var keyring = materialProviders.CreateRawEcdhKeyring(createKeyringInput);
```

------
#### [ Java ]

下列範例會使用`PublicKeyDiscovery`金鑰協議結構描述建立原始 ECDH keyring。此 keyring 可以解密任何訊息，其中指定的私有金鑰的公有金鑰符合存放在訊息加密文字上的收件人公有金鑰。

```
private static void RawEcdhDiscovery() {
    // Instantiate material providers
    final MaterialProviders materialProviders =
      MaterialProviders.builder()
        .MaterialProvidersConfig(MaterialProvidersConfig.builder().build())
        .build();

    KeyPair recipient = GetRawEccKey();

    // Create the Raw ECDH discovery keyring
    final CreateRawEcdhKeyringInput rawKeyringInput =
      CreateRawEcdhKeyringInput.builder()
        .curveSpec(ECDHCurveSpec.{{ECC_NIST_P256}})
        .KeyAgreementScheme(
          RawEcdhStaticConfigurations.builder()
            .PublicKeyDiscovery(
              PublicKeyDiscoveryInput.builder()
                // Must be a PEM-encoded private key
                .recipientStaticPrivateKey(ByteBuffer.wrap(sender.getPrivate().getEncoded()))
                .build()
            )
            .build()
        ).build();

    final IKeyring publicKeyDiscovery  = materialProviders.CreateRawEcdhKeyring(rawKeyringInput);
}
```

------
#### [ Python ]

下列範例會使用`RawEcdhStaticConfigurationsPublicKeyDiscovery`金鑰協議結構描述建立原始 ECDH keyring。此 keyring 可以解密任何訊息，其中指定的私有金鑰的公有金鑰符合存放在訊息加密文字上的收件人公有金鑰。

```
import boto3
from aws_cryptographic_materialproviders.mpl.models import (
    CreateRawEcdhKeyringInput,
    RawEcdhStaticConfigurationsPublicKeyDiscovery,
    PublicKeyDiscoveryInput,
)
from aws_cryptography_primitives.smithygenerated.aws_cryptography_primitives.models import ECDHCurveSpec

# Instantiate the material providers library
mat_prov: AwsCryptographicMaterialProviders = AwsCryptographicMaterialProviders(
    config=MaterialProvidersConfig()
)

# Your get_private_key_bytes must return a PEM-encoded private key
recipient_private_key = get_private_key_bytes()

# Create the raw ECDH discovery keyring
raw_keyring_input = CreateRawEcdhKeyringInput(
    curve_spec = ECDHCurveSpec.{{ECC_NIST_P256}},
    key_agreement_scheme = RawEcdhStaticConfigurationsPublicKeyDiscovery(
        PublicKeyDiscoveryInput(
            recipient_static_private_key = recipient_private_key,
        )
    )
)

keyring = mat_prov.create_raw_ecdh_keyring(raw_keyring_input)
```

------
#### [ Rust ]

下列範例會使用`discovery_raw_ecdh_static_configuration`金鑰協議結構描述建立原始 ECDH keyring。此 keyring 可以解密任何訊息，其中指定的私有金鑰的公有金鑰符合存放在訊息加密文字上的收件人公有金鑰。

```
// Instantiate the AWS Encryption SDK client and material providers library
let esdk_config = AwsEncryptionSdkConfig::builder().build()?;
let esdk_client = esdk_client::Client::from_conf(esdk_config)?;

let mpl_config = MaterialProvidersConfig::builder().build()?;
let mpl = mpl_client::Client::from_conf(mpl_config)?;


// Optional: Create your encryption context
let encryption_context = HashMap::from([
    ("encryption".to_string(), "context".to_string()),
    ("is not".to_string(), "secret".to_string()),
    ("but adds".to_string(), "useful metadata".to_string()),
    ("that can help you".to_string(), "be confident that".to_string()),
    ("the data you are handling".to_string(), "is what you think it is".to_string()),
]);

// Load keys from UTF-8 encoded PEM files.
let mut file = File::open(Path::new(EXAMPLE_ECC_PRIVATE_KEY_FILENAME_RECIPIENT))?;
let mut private_key_recipient_utf8_bytes = Vec::new();
file.read_to_end(&mut private_key_recipient_utf8_bytes)?;

// Create PublicKeyDiscoveryInput
let discovery_raw_ecdh_static_configuration_input =
    PublicKeyDiscoveryInput::builder()
        // Must be a UTF8 PEM-encoded private key
        .recipient_static_private_key(private_key_recipient_utf8_bytes)
        .build()?;

let discovery_raw_ecdh_static_configuration =
    RawEcdhStaticConfigurations::PublicKeyDiscovery(discovery_raw_ecdh_static_configuration_input);

// Create raw ECDH discovery private key keyring
let discovery_raw_ecdh_keyring = mpl
    .create_raw_ecdh_keyring()
    .curve_spec(ecdh_curve_spec)
    .key_agreement_scheme(discovery_raw_ecdh_static_configuration)
    .send()
    .await?;
```

------
#### [ Go ]

```
import (
    "context"
    
	mpl "aws/aws-cryptographic-material-providers-library/releases/go/mpl/awscryptographymaterialproviderssmithygenerated"
	mpltypes "aws/aws-cryptographic-material-providers-library/releases/go/mpl/awscryptographymaterialproviderssmithygeneratedtypes"
	client "github.com/aws/aws-encryption-sdk/awscryptographyencryptionsdksmithygenerated"
	esdktypes "github.com/aws/aws-encryption-sdk/awscryptographyencryptionsdksmithygeneratedtypes"
)

// Instantiate the AWS Encryption SDK client
encryptionClient, err := client.NewClient(esdktypes.AwsEncryptionSdkConfig{})
if err != nil {
    panic(err)
}

// Optional: Create your encryption context
encryptionContext := map[string]string{
    "encryption":                "context",
    "is not":                    "secret",
    "but adds":                  "useful metadata",
    "that can help you":         "be confident that",
    "the data you are handling": "is what you think it is",
}

// Load keys from UTF-8 encoded PEM files.
privateKeyRecipient, err := os.ReadFile(eccPrivateKeyFileNameRecipient)
if err != nil {
    panic(err)
}

// Instantiate the material providers library
matProv, err := mpl.NewClient(mpltypes.MaterialProvidersConfig{})
if err != nil {
    panic(err)
}

// Create PublicKeyDiscoveryInput
discoveryRawEcdhStaticConfigurationInput := mpltypes.PublicKeyDiscoveryInput{
    RecipientStaticPrivateKey: privateKeyRecipient,
}

discoveryRawEcdhStaticConfiguration := &mpltypes.RawEcdhStaticConfigurationsMemberPublicKeyDiscovery{
    Value: discoveryRawEcdhStaticConfigurationInput,
}

// Create raw ECDH discovery private key keyring
discoveryRawEcdhKeyringInput := mpltypes.CreateRawEcdhKeyringInput{
    CurveSpec:          ecdhCurveSpec,
    KeyAgreementScheme: discoveryRawEcdhStaticConfiguration,
}

discoveryRawEcdhKeyring, err := matProv.CreateRawEcdhKeyring(context.Background(), discoveryRawEcdhKeyringInput)
if err != nil {
    panic(err)
}
```

------