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Some site describe config & make for OpenSSL with zlib while I can do it without zlib.
It means zlib is not necessary for openSSL in some case.
Does anyone tell me what case OpenSSL does compression or decompression?
The answer from @JakeGould is useful. I want to know how to choose if I use –z or not?
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Some site describe config & make for OpenSSL with zlib while I can do it without zlib. It means zlib is not necessary for openSSL in some case.
zlib is a free, open source software library for lossless data compression and decompression . It was written by Jean-loup Gailly (compression) and Mark Adler (decompression), in C language. The first version of zlib was released in May 1995. Jean-loup Gailly and Mark Adler also wrote the code for gzip (GNU zip).
For applications that require data compression, the functions in this module allow compression and decompression, using the zlib library. The zlib library has its own home page at https://www.zlib.net.
The compression ratio of zlib ranges between 2:1 to 5:1. Additionally, it provides ten compression levels, and different levels have different compression ratios and speeds. zlib algorithm uses Deflate method for compression and Inflate method for decompression. Deflate method encodes the data into compressed data.
The answer is right in the manual. It relates to the -z option:
Compress or decompress clear text using zlib before encryption or after decryption. This option exists only if OpenSSL with compiled with zlib or zlib-dynamic option.
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