# ExportTr31KeyBlock
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Parameter information for key material export using symmetric TR-31 key exchange method.

## Contents
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 ** WrappingKeyIdentifier **   <a name="paymentcryptography-Type-ExportTr31KeyBlock-WrappingKeyIdentifier"></a>
The `KeyARN` of the the wrapping key. This key encrypts or wraps the key under export for TR-31 key block generation.  
Type: String  
Length Constraints: Minimum length of 7. Maximum length of 322.  
Pattern: `arn:aws:payment-cryptography:[a-z]{2}-[a-z]{1,16}-[0-9]+:[0-9]{12}:(key/[0-9a-zA-Z]{16,64}|alias/[a-zA-Z0-9/_-]+)$|^alias/[a-zA-Z0-9/_-]+`   
Required: Yes

 ** KeyBlockHeaders **   <a name="paymentcryptography-Type-ExportTr31KeyBlock-KeyBlockHeaders"></a>
Optional metadata for export associated with the key material. This data is signed but transmitted in clear text.  
Type: [KeyBlockHeaders](API_KeyBlockHeaders.md) object  
Required: No

## See Also
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For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/payment-cryptography-2021-09-14/ExportTr31KeyBlock) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/payment-cryptography-2021-09-14/ExportTr31KeyBlock) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/payment-cryptography-2021-09-14/ExportTr31KeyBlock)