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20 lines
879 B
Markdown
Executable File
20 lines
879 B
Markdown
Executable File
---
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layout: default
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title: Requirements
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permalink: /requirements/
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---
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# Requirements
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In order to prevent man-in-the-middle attacks, the authorization server MUST require the use of TLS with server authentication as defined by [RFC2818](https://tools.ietf.org/html/rfc2818) for any request sent to the authorization and token endpoints. The client MUST validate the authorization server's TLS certificate as defined by [RFC6125](https://tools.ietf.org/html/rfc6125) and in accordance with its requirements for server identity authentication.
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This library uses key cryptography in order to encrypt and decrypt, as well as verify the integrity of signatures. See the [installation](/installation) page for details on how to generate the keys.
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The following versions of PHP are supported:
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* PHP 5.5 (>=5.5.9)
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* PHP 5.6
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* PHP 7.0
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* HHVM
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The `openssl` PHP extension is required. |