1=pod
2
3=head1 NAME
4
5OSSL_PROVIDER-legacy - OpenSSL legacy provider
6
7=head1 DESCRIPTION
8
9The OpenSSL legacy provider supplies OpenSSL implementations of algorithms
10that have been deemed legacy.  Such algorithms have commonly fallen out of
11use, have been deemed insecure by the cryptography community, or something
12similar.
13
14We can consider this the retirement home of cryptographic algorithms.
15
16=head2 Properties
17
18The implementations in this provider specifically has this property
19defined:
20
21=over 4
22
23=item "provider=legacy"
24
25=back
26
27It may be used in a property query string with fetching functions such as
28L<EVP_MD_fetch(3)> or L<EVP_CIPHER_fetch(3)>, as well as with other
29functions that take a property query string, such as
30L<EVP_PKEY_CTX_new_from_name(3)>.
31
32It isn't mandatory to query for any of these properties, except to
33make sure to get implementations of this provider and none other.
34
35=head1 OPERATIONS AND ALGORITHMS
36
37The OpenSSL legacy provider supports these operations and algorithms:
38
39=head2 Hashing Algorithms / Message Digests
40
41=over 4
42
43=item MD2, see L<EVP_MD-MD2(7)>
44
45=item MD4, see L<EVP_MD-MD4(7)>
46
47=item MDC2, see L<EVP_MD-MDC2(7)>
48
49=item WHIRLPOOL, see L<EVP_MD-WHIRLPOOL(7)>
50
51=item RIPEMD160, see L<EVP_MD-RIPEMD160(7)>
52
53=back
54
55=head2 Symmetric Ciphers
56
57Not all of these symmetric cipher algorithms are enabled by default.
58
59=over 4
60
61=item Blowfish, see L<EVP_CIPHER-BLOWFISH(7)>
62
63=item CAST, see L<EVP_CIPHER-CAST(7)>
64
65=item DES, see L<EVP_CIPHER-DES(7)>
66
67The algorithm names are: DES_ECB, DES_CBC, DES_OFB, DES_CFB, DES_CFB1, DES_CFB8
68and DESX_CBC.
69
70=item IDEA, see L<EVP_CIPHER-IDEA(7)>
71
72=item RC2, see L<EVP_CIPHER-RC2(7)>
73
74=item RC4, see L<EVP_CIPHER-RC4(7)>
75
76=item RC5, see L<EVP_CIPHER-RC5(7)>
77
78Disabled by default. Use I<enable-rc5> config option to enable.
79
80=item SEED, see L<EVP_CIPHER-SEED(7)>
81
82=back
83
84=head2 Key Derivation Function (KDF)
85
86=over 4
87
88=item PBKDF1
89
90=back
91
92=begin comment
93
94When algorithms for other operations start appearing, the
95following =head2 titles are appropriate to use:
96
97- Message Authentication Code (MAC)
98
99- Key Derivation Function (KDF)
100
101- Key Exchange
102
103- Signature
104
105- Asymmetric Cipher
106
107- Asymmetric Key Management
108
109=end comment
110
111=head1 SEE ALSO
112
113L<OSSL_PARAM(3)>,
114L<openssl-core.h(7)>,
115L<openssl-core_dispatch.h(7)>,
116L<provider(7)>
117
118=head1 HISTORY
119
120This functionality was added in OpenSSL 3.0.
121
122=head1 COPYRIGHT
123
124Copyright 2020-2021 The OpenSSL Project Authors. All Rights Reserved.
125
126Licensed under the Apache License 2.0 (the "License").  You may not use
127this file except in compliance with the License.  You can obtain a copy
128in the file LICENSE in the source distribution or at
129L<https://www.openssl.org/source/license.html>.
130
131=cut
132