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This list applies only to certificates issued directly by AWS Private CA through its console, API, or command line. When AWS Certificate Manager issues certificates using a CA from AWS Private CA, it supports some but not all of these algorithms. For more information, see Request a Private Certificate in the AWS Certificate Manager User Guide.

AWS Private CA enables creation of private certificate authority (CA) hierarchies, including root and subordinate CAs, without the investment and maintenance costs of operating an on-premises CA. Your private CAs can issue end-entity X.509 certificates useful in scenarios including:

Policy Mappings. Used in CA certificates. Lists one or more pairs of OIDs; each pair includes an issuerDomainPolicy and a subjectDomainPolicy.

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If you use the AWS Private CA API or AWS CLI to issue a certificate or to export a private certificate from ACM, you can install the certificate anywhere you want.

Path length (pathLenConstraint) determines how many subordinate CAs may exist downstream from the imported CA certificate. AWS Private CA enforces path length by failing with a validation exception for the following reasons:

AWS Private CA does not enforce certain constraints defined in RFC 5280. The reverse situation is also true: Certain additional constraints appropriate to a private CA are enforced.

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Like most AWS resources, private certificate authorities (CAs) are Regional resources. To use private CAs in more than one Region, you must create your CAs in those Regions. You cannot copy private CAs between Regions. Visit AWS Regions and Endpoints in the AWS General Reference or the AWS Region Table to see the Regional availability for AWS Private CA.

SubjectPublicKeyInfo and Subject Alternative Name (SAN). When issuing a certificate, AWS Private CA copies the SubjectPublicKeyInfo and SAN extensions from the provided CSR without performing validation.

You can also integrate private CAs into Amazon Elastic Kubernetes Service to provide certificate issuance inside a Kubernetes cluster. For more information, see Secure Kubernetes with AWS Private CA.

Your account is charged a monthly price for each private CA starting from the time that you create it. You are also charged for each certificate that you issue. This charge includes certificates that you export from ACM and certificates that you create from the AWS Private CA API or AWS Private CA CLI. You are not charged for a private CA after it has been deleted. However, if you restore a private CA, you are charged for the time between deletion and restoration. Private certificates whose private key you cannot access are free. These include certificates that are used with Integrated Services such as Elastic Load Balancing, CloudFront, and API Gateway.

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Importing a CA certificate would violate the path length constraint in the CA certificate or in any CA certificate in the chain.

Basic constraints indicate whether or not the resource identified by the certificate is a CA and can issue certificates. CA certificates imported to AWS Private CA must include the basic constraints extension, and the extension must be marked critical. In addition to the critical flag, CA=true must be set. AWS Private CA enforces basic constraints by failing with a validation exception for the following reasons:

Subject Key Identifier (SKI) and Authority Key Identifier (AKI). The RFC requires a CA certificate to contain the SKI extension. Certificates issued by the CA must contain an AKI extension matching the CA certificate's SKI. AWS does not enforce these requirements. If your CA Certificate does not contain an SKI, the issued end-entity or subordinate CA certificate AKI will be the SHA-1 hash of the issuer public key instead.

In all cases, the specified signing algorithm family (RSA or ECDSA) must match the algorithm family of the CA's private key.

Not After date. In conformity with RFC 5280, AWS Private CA prevents the issuance of certificates bearing a Not After date later than the Not After date of the issuing CA's certificate.

Subject Information Access. How to access information and services for the subject of the certificate in which the extension appears.

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If you use AWS Certificate Manager to request a private certificate, you can associate that certificate with any service that is integrated with ACM. This applies both to certificates chained to a AWS Private CA root and to certificates chained to an external root. For more information, see Integrated Services in the AWS Certificate Manager User Guide.

AWS Private CA operations can be accessed from the AWS Management Console, using the AWS Private CA API, or using the AWS CLI.

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For the latest AWS Private CA pricing information, see AWS Private Certificate Authority Pricing. You can also use the AWS pricing calculator to estimate costs.

Name constraints indicate a name space within which all subject names in subsequent certificates in a certification path must be located. Restrictions apply to the subject distinguished name and subject alternative names.