# SigningKeyInfo
<a name="API_SigningKeyInfo"></a>

The signing key used to cryptographically sign a support permit.

## Contents
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**Important**  
This data type is a UNION, so only one of the following members can be specified when used or returned.

 ** kmsKey **   <a name="supportauthorization-Type-SigningKeyInfo-kmsKey"></a>
The ARN of the AWS KMS key used to sign the permit. The key must have key spec ECC\_NIST\_P384 and key usage SIGN\_VERIFY.  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 512.  
Pattern: `[a-zA-Z0-9/:_-]{1,512}`   
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\+\+](https://docs.aws.amazon.com/goto/SdkForCpp/supportauthz-2026-06-30/SigningKeyInfo) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/supportauthz-2026-06-30/SigningKeyInfo) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/supportauthz-2026-06-30/SigningKeyInfo)