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