Does CRYPT_ENVINFO_COMPRESSION also encrypt?

[Timo Kunze]

Hi,

to compress and encrypt data, I used to envelopes so far. The first one
compresses and the second one encrypts. But on page 55 of the manual, it
sounds a bit like I'm actually encrypting the data twice. Can a single
envelope be used to compress AND encrypt in a single step?

Oh, and which compression algorithm does cryptlib use?

Thanks in advance
Timo
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[Peter Gutmann]

Timo Kunze <TKunze71216@...> writes:

>to compress and encrypt data, I used to envelopes so far. The first one
>compresses and the second one encrypts. But on page 55 of the manual, it
>sounds a bit like I'm actually encrypting the data twice. Can a single
>envelope be used to compress AND encrypt in a single step?

No, each layer of CMS processing needs its own envelope.

>Oh, and which compression algorithm does cryptlib use?

zlib, see RFC 3274.

Peter.

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