CentOS 7.0 - man page for openssl_add_all_ciphers (centos section 3)
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OpenSSL_add_all_algorithms(3) OpenSSL OpenSSL_add_all_algorithms(3)
OpenSSL_add_all_algorithms, OpenSSL_add_all_ciphers, OpenSSL_add_all_digests - add
algorithms to internal table
OpenSSL keeps an internal table of digest algorithms and ciphers. It uses this table to
lookup ciphers via functions such as EVP_get_cipher_byname().
OpenSSL_add_all_digests() adds all digest algorithms to the table.
OpenSSL_add_all_algorithms() adds all algorithms to the table (digests and ciphers).
OpenSSL_add_all_ciphers() adds all encryption algorithms to the table including password
based encryption algorithms.
EVP_cleanup() removes all ciphers and digests from the table.
None of the functions return a value.
A typical application will call OpenSSL_add_all_algorithms() initially and EVP_cleanup()
An application does not need to add algorithms to use them explicitly, for example by
EVP_sha1(). It just needs to add them if it (or any of the functions it calls) needs to
The cipher and digest lookup functions are used in many parts of the library. If the table
is not initialized several functions will misbehave and complain they cannot find
algorithms. This includes the PEM, PKCS#12, SSL and S/MIME libraries. This is a common
query in the OpenSSL mailing lists.
Calling OpenSSL_add_all_algorithms() links in all algorithms: as a result a statically
linked executable can be quite large. If this is important it is possible to just add the
required ciphers and digests.
Although the functions do not return error codes it is possible for them to fail. This
will only happen as a result of a memory allocation failure so this is not too much of a
problem in practice.
evp(3), EVP_DigestInit(3), EVP_EncryptInit(3)
1.0.1e 2013-02-11 OpenSSL_add_all_algorithms(3)
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