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author | marha <marha@users.sourceforge.net> | 2009-06-28 22:07:26 +0000 |
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committer | marha <marha@users.sourceforge.net> | 2009-06-28 22:07:26 +0000 |
commit | 3562e78743202e43aec8727005182a2558117eca (patch) | |
tree | 8f9113a77d12470c5c851a2a8e4cb02e89df7d43 /openssl/doc/crypto/OpenSSL_add_all_algorithms.pod | |
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Diffstat (limited to 'openssl/doc/crypto/OpenSSL_add_all_algorithms.pod')
-rw-r--r-- | openssl/doc/crypto/OpenSSL_add_all_algorithms.pod | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/openssl/doc/crypto/OpenSSL_add_all_algorithms.pod b/openssl/doc/crypto/OpenSSL_add_all_algorithms.pod new file mode 100644 index 000000000..e63411b5b --- /dev/null +++ b/openssl/doc/crypto/OpenSSL_add_all_algorithms.pod @@ -0,0 +1,66 @@ +=pod + +=head1 NAME + +OpenSSL_add_all_algorithms, OpenSSL_add_all_ciphers, OpenSSL_add_all_digests - +add algorithms to internal table + +=head1 SYNOPSIS + + #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); + +=head1 DESCRIPTION + +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. + +=head1 RETURN VALUES + +None of the functions return a value. + +=head1 NOTES + +A typical application will call OpenSSL_add_all_algorithms() initially and +EVP_cleanup() before exiting. + +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 lookup algorithms. + +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. + +=head1 BUGS + +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. + +=head1 SEE ALSO + +L<evp(3)|evp(3)>, L<EVP_DigestInit(3)|EVP_DigestInit(3)>, +L<EVP_EncryptInit(3)|EVP_EncryptInit(3)> + +=cut |