LIBRESSL-OPENSSL_ADD_ALL_ALGORITHMS(3)

💖 NAME 💖

hiii bestie 💕 welcome to LIBRESSL-OPENSSL_ADD_ALL_ALGORITHMS(3), a Library Functions Manual page about the OpenSSL “add all the algorithms” era. The whole squad is:

• OpenSSL_add_all_algorithms, OpenSSL_add_all_ciphers, OpenSSL_add_all_digests, EVP_cleanup, SSLeay_add_all_algorithms — add algorithms to internal table

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✨ SYNOPSIS ✨

library “libcrypto”
#include <openssl/evp.h>

void
OpenSSL_add_all_algorithms(void);

void
OpenSSL_add_all_ciphers(void);

void
OpenSSL_add_all_digests(void);

void
EVP_cleanup(void);

void
SSLeay_add_all_algorithms(void);

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🌸 DESCRIPTION 🌸

okay so first thing, bestie: these functions are deprecated. It is never useful for any application program to call any of them explicitly. Most of them have no effect except that they may or may not call OPENSSL_init_crypto(3). That’s the whole vibe. 💅

The library contains internal tables of digest algorithms and ciphers. It uses these tables to look up digests and ciphers via EVP_get_digestbyname(3) and EVP_get_cipherbyname(3), respectively. In LibreSSL, these tables are static constants and do not require initialization. slay for static constants, honestly 🎀

🫶 the function-by-function tea ☕

• OpenSSL_add_all_algorithms() — used to add all digests and ciphers to the tables. If an application is compiled with the preprocessor symbol OPENSSL_LOAD_CONF defined, it also calls OPENSSL_config(3) with a NULL argument, loading the default configuration file. Relying on this behaviour is not recommended 🙈. If loading a configuration file is desired, call OPENSSL_config(3) or CONF_modules_load_file(3) directly.
• OpenSSL_add_all_digests() — used to add all digest algorithms to the table.
• OpenSSL_add_all_ciphers() — used to add all encryption algorithms to the table.
• EVP_cleanup() — has no effect; it used to remove various kinds of application-supplied data that is no longer supported in the first place. literally no notes 💀
• SSLeay_add_all_algorithms() — a deprecated alias for OpenSSL_add_all_algorithms().
• OpenSSL_add_all_algorithms() and SSLeay_add_all_algorithms() — implemented as macros.

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🦋 SEE ALSO 🦋

evp(3), EVP_DigestInit(3), EVP_EncryptInit(3), OPENSSL_config(3)

go read those if you want the full lore 🌈

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🎀 HISTORY 🎀

• EVP_cleanup(), SSLeay_add_all_algorithms(), and precursor functions SSLeay_add_all_ciphers() and SSLeay_add_all_digests() first appeared in SSLeay 0.8.0 and have been available since OpenBSD 2.4. vintage behavior ✨
• OpenSSL_add_all_algorithms(), OpenSSL_add_all_ciphers(), and OpenSSL_add_all_digests() first appeared in OpenSSL 0.9.5 and have been available since OpenBSD 2.7. and that’s the timeline, bestie 🫶

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💀 BUGS 💀

Although the functions do not return error codes, it is possible for them to fail. not the “no error code means guaranteed success” plot twist 😭

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xoxo, this page came to you from Debian, dated June 12, 2025, with footer energy OPENSSL_ADD_ALL_ALGORITHMS(3). mwah 💋✨