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# 为特定卡生成或验证 iCvV
<a name="use-cases-issuers.generalfunctions.icvv"></a>

[iCvV](terminology.md#terms.icvv) 使用的算法与 CVV/ 相同，CVV2 但是 iCvV 嵌入在芯片卡中。它的服务代码是 999。

## 创建密钥
<a name="use-cases-issuers.generalfunctions.icvv.setup"></a>

```
$ aws payment-cryptography create-key --exportable --key-attributes KeyAlgorithm=TDES_2KEY,KeyUsage=TR31_C0_CARD_VERIFICATION_KEY,KeyClass=SYMMETRIC_KEY,KeyModesOfUse='{Generate=true,Verify=true}' --tags='[{"Key":"KEY_PURPOSE","Value":"ICVV"},{"Key":"CARD_BIN","Value":"12345678"}]'
```

响应会回显请求参数，包括后续调用的 ARN 以及密钥检查值 (KCV)。

```
{
               "Key": {
                   "KeyArn": "arn:aws:payment-cryptography:us-east-2:111122223333:key/c7dsi763r6s7lfp3",
                   "KeyAttributes": {
                       "KeyUsage": "TR31_C0_CARD_VERIFICATION_KEY",
                       "KeyClass": "SYMMETRIC_KEY",
                       "KeyAlgorithm": "TDES_2KEY",
                       "KeyModesOfUse": {
                           "Encrypt": false,
                           "Decrypt": false,
                           "Wrap": false,
                           "Unwrap": false,
                           "Generate": true,
                           "Sign": false,
                           "Verify": true,
                           "DeriveKey": false,
                           "NoRestrictions": false
                       }
                   },
                   "KeyCheckValue": "1201FB",
                   "KeyCheckValueAlgorithm": "ANSI_X9_24",
                   "Enabled": true,
                   "Exportable": true,
                   "KeyState": "CREATE_COMPLETE",
                   "KeyOrigin": "AWS_PAYMENT_CRYPTOGRAPHY",
                   "CreateTimestamp": "2023-06-05T06:41:46.648000-07:00",
                   "UsageStartTimestamp": "2023-06-05T06:41:46.626000-07:00"
               }
           }
```

注意代表密钥的那个`KeyArn`，例如 *arn: aws: payment-cryptography: us-east-2:111122223333: key/c7dsi763r6* s7s7lfp3。您需要在下一步中执行该操作。

## 生成一个 iCvV
<a name="use-cases-issuers.generalfunctions.icvv.generate"></a>

**Example**  
在此示例中，我们将为给定的 PAN 生成一个 [ICvV](terminology.md#terms.icvv)，其输入为`PAN`，服务代码（由 ISO/IEC 7813 定义）为 999，卡到期日期。  
有关所有可用参数，请参阅 API 参考指南中的 [CardVerificationValue1](https://docs.aws.amazon.com/payment-cryptography/latest/DataAPIReference/API_CardVerificationValue1.html)。  

```
$ aws payment-cryptography-data generate-card-validation-data --key-identifier arn:aws:payment-cryptography:us-east-2:111122223333:key/c7dsi763r6s7lfp3 --primary-account-number=171234567890123 --generation-attributes CardVerificationValue1='{CardExpiryDate=1127,ServiceCode=999}'
```

```
                     {
                         "KeyArn": "arn:aws:payment-cryptography:us-east-2:111122223333:key/c7dsi763r6s7lfp3",
                         "KeyCheckValue": "1201FB",
                         "ValidationData": "532"
                     }
```

## 验证 iCvV
<a name="use-cases-issuers.generalfunctions.icvv.verify"></a>

**Example**  
为了进行验证，输入的是CVK `PAN`、服务代码为999、卡到期日期以及交易期间提供的待验证的iCVV。  
有关所有可用参数，请参阅 API 参考指南中的 [CardVerificationValue1](https://docs.aws.amazon.com/payment-cryptography/latest/DataAPIReference/API_CardVerificationValue1.html)。  
iCvV 不是用户输入的值（比如 CVV2），但通常嵌入在卡片上。 EMV/chip 应考虑在提供时是否应始终进行验证。

```
$ aws payment-cryptography-data verify-card-validation-data --key-identifier arn:aws:payment-cryptography:us-east-2:111122223333:key/c7dsi763r6s7lfp3 --primary-account-number=171234567890123 --verification-attributes CardVerificationValue1='{CardExpiryDate=1127,ServiceCode=999} --validation-data 532
```

```
{
                       "KeyArn": "arn:aws:payment-cryptography:us-east-2:111122223333:key/c7dsi763r6s7lfp3",
                       "KeyCheckValue": "1201FB",
                       "ValidationData": "532"
   }
```