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+.\" ========================================================================
+.\"
+.IX Title "OSSL_PROVIDER-LEGACY 7ossl"
+.TH OSSL_PROVIDER-LEGACY 7ossl "2023-09-19" "3.0.11" "OpenSSL"
+.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
+.\" way too many mistakes in technical documents.
+.if n .ad l
+.nh
+.SH "NAME"
+OSSL_PROVIDER\-legacy \- OpenSSL legacy provider
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+The OpenSSL legacy provider supplies OpenSSL implementations of algorithms
+that have been deemed legacy.  Such algorithms have commonly fallen out of
+use, have been deemed insecure by the cryptography community, or something
+similar.
+.PP
+We can consider this the retirement home of cryptographic algorithms.
+.SS "Properties"
+.IX Subsection "Properties"
+The implementations in this provider specifically has this property
+defined:
+.ie n .IP """provider=legacy""" 4
+.el .IP "``provider=legacy''" 4
+.IX Item "provider=legacy"
+.PP
+It may be used in a property query string with fetching functions such as
+\&\fBEVP_MD_fetch\fR\|(3) or \fBEVP_CIPHER_fetch\fR\|(3), as well as with other
+functions that take a property query string, such as
+\&\fBEVP_PKEY_CTX_new_from_name\fR\|(3).
+.PP
+It isn't mandatory to query for any of these properties, except to
+make sure to get implementations of this provider and none other.
+.SH "OPERATIONS AND ALGORITHMS"
+.IX Header "OPERATIONS AND ALGORITHMS"
+The OpenSSL legacy provider supports these operations and algorithms:
+.SS "Hashing Algorithms / Message Digests"
+.IX Subsection "Hashing Algorithms / Message Digests"
+.IP "\s-1MD2,\s0 see \s-1\fBEVP_MD\-MD2\s0\fR\|(7)" 4
+.IX Item "MD2, see EVP_MD-MD2"
+.PD 0
+.IP "\s-1MD4,\s0 see \s-1\fBEVP_MD\-MD4\s0\fR\|(7)" 4
+.IX Item "MD4, see EVP_MD-MD4"
+.IP "\s-1MDC2,\s0 see \s-1\fBEVP_MD\-MDC2\s0\fR\|(7)" 4
+.IX Item "MDC2, see EVP_MD-MDC2"
+.IP "\s-1WHIRLPOOL,\s0 see \s-1\fBEVP_MD\-WHIRLPOOL\s0\fR\|(7)" 4
+.IX Item "WHIRLPOOL, see EVP_MD-WHIRLPOOL"
+.IP "\s-1RIPEMD160,\s0 see \s-1\fBEVP_MD\-RIPEMD160\s0\fR\|(7)" 4
+.IX Item "RIPEMD160, see EVP_MD-RIPEMD160"
+.PD
+.SS "Symmetric Ciphers"
+.IX Subsection "Symmetric Ciphers"
+Not all of these symmetric cipher algorithms are enabled by default.
+.IP "Blowfish, see \s-1\fBEVP_CIPHER\-BLOWFISH\s0\fR\|(7)" 4
+.IX Item "Blowfish, see EVP_CIPHER-BLOWFISH"
+.PD 0
+.IP "\s-1CAST,\s0 see \s-1\fBEVP_CIPHER\-CAST\s0\fR\|(7)" 4
+.IX Item "CAST, see EVP_CIPHER-CAST"
+.IP "\s-1DES,\s0 see \s-1\fBEVP_CIPHER\-DES\s0\fR\|(7)" 4
+.IX Item "DES, see EVP_CIPHER-DES"
+.PD
+The algorithm names are: \s-1DES_ECB, DES_CBC, DES_OFB, DES_CFB, DES_CFB1, DES_CFB8\s0
+and \s-1DESX_CBC.\s0
+.IP "\s-1IDEA,\s0 see \s-1\fBEVP_CIPHER\-IDEA\s0\fR\|(7)" 4
+.IX Item "IDEA, see EVP_CIPHER-IDEA"
+.PD 0
+.IP "\s-1RC2,\s0 see \s-1\fBEVP_CIPHER\-RC2\s0\fR\|(7)" 4
+.IX Item "RC2, see EVP_CIPHER-RC2"
+.IP "\s-1RC4,\s0 see \s-1\fBEVP_CIPHER\-RC4\s0\fR\|(7)" 4
+.IX Item "RC4, see EVP_CIPHER-RC4"
+.IP "\s-1RC5,\s0 see \s-1\fBEVP_CIPHER\-RC5\s0\fR\|(7)" 4
+.IX Item "RC5, see EVP_CIPHER-RC5"
+.PD
+Disabled by default. Use \fIenable\-rc5\fR config option to enable.
+.IP "\s-1SEED,\s0 see \s-1\fBEVP_CIPHER\-SEED\s0\fR\|(7)" 4
+.IX Item "SEED, see EVP_CIPHER-SEED"
+.SS "Key Derivation Function (\s-1KDF\s0)"
+.IX Subsection "Key Derivation Function (KDF)"
+.PD 0
+.IP "\s-1PBKDF1\s0" 4
+.IX Item "PBKDF1"
+.PD
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+\&\s-1\fBOSSL_PARAM\s0\fR\|(3),
+\&\fBopenssl\-core.h\fR\|(7),
+\&\fBopenssl\-core_dispatch.h\fR\|(7),
+\&\fBprovider\fR\|(7)
+.SH "HISTORY"
+.IX Header "HISTORY"
+This functionality was added in OpenSSL 3.0.
+.SH "COPYRIGHT"
+.IX Header "COPYRIGHT"
+Copyright 2020\-2021 The OpenSSL Project Authors. All Rights Reserved.
+.PP
+Licensed under the Apache License 2.0 (the \*(L"License\*(R").  You may not use
+this file except in compliance with the License.  You can obtain a copy
+in the file \s-1LICENSE\s0 in the source distribution or at
+<https://www.openssl.org/source/license.html>.