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 45Disabled by default. Use I<enable-md2> config option to enable. 46 47=item MD4, see L<EVP_MD-MD4(7)> 48 49=item MDC2, see L<EVP_MD-MDC2(7)> 50 51=item WHIRLPOOL, see L<EVP_MD-WHIRLPOOL(7)> 52 53=item RIPEMD160, see L<EVP_MD-RIPEMD160(7)> 54 55=back 56 57=head2 Symmetric Ciphers 58 59Not all of these symmetric cipher algorithms are enabled by default. 60 61=over 4 62 63=item Blowfish, see L<EVP_CIPHER-BLOWFISH(7)> 64 65=item CAST, see L<EVP_CIPHER-CAST(7)> 66 67=item DES, see L<EVP_CIPHER-DES(7)> 68 69The algorithm names are: DES_ECB, DES_CBC, DES_OFB, DES_CFB, DES_CFB1, DES_CFB8 70and DESX_CBC. 71 72=item IDEA, see L<EVP_CIPHER-IDEA(7)> 73 74=item RC2, see L<EVP_CIPHER-RC2(7)> 75 76=item RC4, see L<EVP_CIPHER-RC4(7)> 77 78=item RC5, see L<EVP_CIPHER-RC5(7)> 79 80Disabled by default. Use I<enable-rc5> config option to enable. 81 82=item SEED, see L<EVP_CIPHER-SEED(7)> 83 84=back 85 86=head2 Key Derivation Function (KDF) 87 88=over 4 89 90=item PBKDF1 91 92=item PVKKDF 93 94=back 95 96=begin comment 97 98When algorithms for other operations start appearing, the 99following =head2 titles are appropriate to use: 100 101- Message Authentication Code (MAC) 102 103- Key Derivation Function (KDF) 104 105- Key Exchange 106 107- Signature 108 109- Asymmetric Cipher 110 111- Asymmetric Key Management 112 113=end comment 114 115=head1 SEE ALSO 116 117L<OSSL_PARAM(3)>, 118L<openssl-core.h(7)>, 119L<openssl-core_dispatch.h(7)>, 120L<provider(7)> 121 122=head1 HISTORY 123 124This functionality was added in OpenSSL 3.0. 125 126=head1 COPYRIGHT 127 128Copyright 2020-2021 The OpenSSL Project Authors. All Rights Reserved. 129 130Licensed under the Apache License 2.0 (the "License"). You may not use 131this file except in compliance with the License. You can obtain a copy 132in the file LICENSE in the source distribution or at 133L<https://www.openssl.org/source/license.html>. 134 135=cut 136
