libcrypt.so vs libcrypto.so, what's the difference?

Question

I am reading some package files of Ubuntu and find that libc depends on libcrypt1. libcrypt1 contains these files (https://packages.ubuntu.com/focal/amd64/libcrypt1/filelist):

/lib/x86_64-linux-gnu/libcrypt.so.1
/lib/x86_64-linux-gnu/libcrypt.so.1.1.0
/usr/share/doc/libcrypt1/changelog.Debian.gz
/usr/share/doc/libcrypt1/copyright

while libcrypto.so (https://packages.ubuntu.com/focal/amd64/libssl1.1/filelist) is installed by libssl, which I think belongs to openssl (correct me if I am wrong)?

So what's the difference between libcrypt.so and libcrypto.so?

I am more familiar with libcrypto.so for which I know it provides some TLS layer functionalites.

What functionality does libcrypt.so provide?

Google doesn't give any reuslts while indicating that libcrypt.so is kinda useless and deprecated?

Answer 1

they're unrelated

libcrypt:

Description-en: libcrypt shared library libxcrypt is a modern library for one-way hashing of passwords. It supports DES, MD5, NTHASH, SUNMD5, SHA-2-256, SHA-2-512, and bcrypt-based password hashes It provides the traditional Unix 'crypt' and 'crypt_r' interfaces, as well as a set of extended interfaces like 'crypt_gensalt'.

symbols provided by libcrypt (at least on my host):

$ nm -D /usr/lib/x86_64-linux-gnu/libcrypt.so | grep ' T ' | awk '{print $3}' | sort -u | xargs
crypt crypt_checksalt crypt_gensalt crypt_gensalt_r crypt_gensalt_ra crypt_gensalt_rn crypt_preferred_method crypt_r crypt_ra crypt_rn encrypt encrypt_r fcrypt setkey setkey_r xcrypt xcrypt_gensalt xcrypt_gensalt_r xcrypt_r

libcrypto is the openssl cryptography routines