262 lines
6.3 KiB
Groff
262 lines
6.3 KiB
Groff
.rn '' }`
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'''
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'''
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''' Set up \*(-- to give an unbreakable dash;
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''' Bell System Logo is used as a dummy character.
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.tr \(*W-|\(bv\*(Tr
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.\" If the F register is turned on, we'll generate
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.\" index entries out stderr for the following things:
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.\" TH Title
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.\" SH Header
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.\" X<> Xref (embedded
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.\}
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.TH OpenSSL_add_all_algorithms 3 "0.9.5a" "22/Jul/2000" "OpenSSL"
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.UC
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.\}
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.rm #[ #] #H #V #F C
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.SH "NAME"
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\fIOpenSSL_add_all_algorithms()\fR \- add algorithms to internal table
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.SH "LIBRARY"
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libcrypto, -lcrypto
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.SH "SYNOPSIS"
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.PP
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.Vb 1
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\& #include <openssl/evp.h>
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.Ve
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.Vb 3
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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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.Ve
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.Vb 1
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\& void EVP_cleanup(void);
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.Ve
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.SH "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 \fIEVP_get_cipher_byname()\fR.
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.PP
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\fIOpenSSL_add_all_digests()\fR adds all digest algorithms to the table.
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.PP
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\fIOpenSSL_add_all_algorithms()\fR adds all algorithms to the table (digests and
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ciphers).
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.PP
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\fIOpenSSL_add_all_ciphers()\fR adds all encryption algorithms to the table including
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password based encryption algorithms.
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.PP
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\fIEVP_cleanup()\fR removes all ciphers and digests from the table.
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.SH "RETURN VALUES"
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None of the functions return a value.
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.SH "NOTES"
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A typical application will will call \fIOpenSSL_add_all_algorithms()\fR initially and
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\fIEVP_cleanup()\fR before exiting.
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.PP
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An application does not need to add algorithms to use them explicitly, for example
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by \fIEVP_sha1()\fR. 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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.PP
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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 initialised 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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.PP
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Calling \fIOpenSSL_add_all_algorithms()\fR 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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.SH "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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.SH "SEE ALSO"
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the \fIevp(3)|evp(3)\fR manpage, the \fIEVP_DigestInit(3)|EVP_DigestInit(3)\fR manpage,
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the \fIEVP_EncryptInit(3)|EVP_EncryptInit(3)\fR manpage
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.rn }` ''
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.IX Title "OpenSSL_add_all_algorithms 3"
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.IX Name "OpenSSL_add_all_algorithms() - add algorithms to internal table"
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.IX Header "NAME"
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.IX Header "SYNOPSIS"
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.IX Header "DESCRIPTION"
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.IX Header "RETURN VALUES"
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.IX Header "NOTES"
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.IX Header "BUGS"
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.IX Header "SEE ALSO"
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