Best Cac Enabler Mac OSX Port
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Seems to be an issue with 10.11.6. For the record, Im using a SCR331 card reader with the most recent version of CACKey as the middleware.

The certificates show as valid and are used for login so I know they are valid.

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We have been working closely with Apple and especially with Kenneth Van Alstyne, the developer who manages the Mac OSX port of the open source CACkey driver, to understand and solve this issue.

Kenneth has just released a new version 0.7.8 of the CACkey driver that should solve this issue and includes several fixes.

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We need more help to investigate about it, as it may also require an update to work again.

Please consider using CACkey version 0.7.8 until we have more to share on Centrify.

Product Manager, Adobe Document Cloud And now some technical details Adobe Acrobat adopts SHA256 as the default digest algorithm for digital signatures since version 9.1 (2009).

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However, CACkey drivers before v.0.7.8 dont support SHA256 when used via Apple KeychaintokenD, but only the deprecated SHA1 algorithm.

To make the signature possible when SHA256 is not supported, Acrobat adopts a fallback mechanism to SHA1.

Apple Mac OSX update 10.11.6 made SHA-2 (which was previously unsupported) as the default hashing algorithm, due to which the behavior of certain crypto API in OSX have changed.

For this reason Acrobat started to fail signing: the SHA1 fallback mechanism is impacted by these crypto API changes and fails.

CACKey 0.7.8 for Mac OSX now includes a new PKCS11.tokend module that adds SHA-2 support (SHA256, SHA384, and SHA512), so Acrobat does not have to fallback to SHA1 anymore.

Adobe is working to fix the fallback mechanism in Acrobat due to OSX 10.11.6, but this has no more impact on signing with CACkey driver after the user updates to version 0.7.8.

Thanks to Kenneth Van Alstyne and Adobes Krishna Kumar Pandey for working hard at solving this issue.

Seems to be an issue with 10.11.6.

For the record, Im using a SCR331 card reader with the most recent version of CACKey as the middleware.

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