66 lines
2 KiB
Text
66 lines
2 KiB
Text
=pod
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=head1 NAME
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OpenSSL_add_all_algorithms, OpenSSL_add_all_ciphers, OpenSSL_add_all_digests, EVP_cleanup -
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add algorithms to internal table
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=head1 SYNOPSIS
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#include <openssl/evp.h>
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void OpenSSL_add_all_algorithms(void);
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void OpenSSL_add_all_ciphers(void);
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void OpenSSL_add_all_digests(void);
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void EVP_cleanup(void);
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=head1 DESCRIPTION
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OpenSSL keeps an internal table of digest algorithms and ciphers. It uses
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this table to lookup ciphers via functions such as EVP_get_cipher_byname().
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OpenSSL_add_all_digests() adds all digest algorithms to the table.
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OpenSSL_add_all_algorithms() adds all algorithms to the table (digests and
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ciphers).
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OpenSSL_add_all_ciphers() adds all encryption algorithms to the table including
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password based encryption algorithms.
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EVP_cleanup() removes all ciphers and digests from the table.
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=head1 RETURN VALUES
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None of the functions return a value.
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=head1 NOTES
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A typical application will call OpenSSL_add_all_algorithms() initially and
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EVP_cleanup() before exiting.
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An application does not need to add algorithms to use them explicitly, for example
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by EVP_sha1(). It just needs to add them if it (or any of the functions it calls)
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needs to lookup algorithms.
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The cipher and digest lookup functions are used in many parts of the library. If
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the table is not initialized several functions will misbehave and complain they
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cannot find algorithms. This includes the PEM, PKCS#12, SSL and S/MIME libraries.
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This is a common query in the OpenSSL mailing lists.
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Calling OpenSSL_add_all_algorithms() links in all algorithms: as a result a
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statically linked executable can be quite large. If this is important it is possible
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to just add the required ciphers and digests.
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=head1 BUGS
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Although the functions do not return error codes it is possible for them to fail.
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This will only happen as a result of a memory allocation failure so this is not
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too much of a problem in practice.
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=head1 SEE ALSO
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L<evp(3)|evp(3)>, L<EVP_DigestInit(3)|EVP_DigestInit(3)>,
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L<EVP_EncryptInit(3)|EVP_EncryptInit(3)>
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=cut
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