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Apr
28
comment Is there a standard for OpenSSL-interoperable AES encryption?
You can use PKCS #7/CMS, but the original question was about OpenSSL's base64 format. If it was CMS it'd be either raw binary or denoted with "----- BEGIN PKCS7 MESSAGE -----" or something similar. There is a standard for CMS-based AES encryption (and PGP-based AES encryption), but not for whatever format OpenSSL uses with its base64 format.
Apr
28
comment Is there a standard for OpenSSL-interoperable AES encryption?
OpenSSL doesn't use CMS containers, it's a proprietary format. The thing with proprietary formats is that they're, well, proprietary. You'd have to reverse-engineer the OpenSSL source code to figure out what the actual format is.