| 1 | =pod
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| 2 |
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| 3 | =head1 NAME
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| 4 |
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| 5 | EVP_PBE_CipherInit, EVP_PBE_CipherInit_ex,
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| 6 | EVP_PBE_find, EVP_PBE_find_ex - Password based encryption routines
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| 7 |
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| 8 | =head1 SYNOPSIS
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| 9 |
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| 10 | #include <openssl/evp.h>
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| 11 |
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| 12 | int EVP_PBE_CipherInit(ASN1_OBJECT *pbe_obj, const char *pass, int passlen,
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| 13 | ASN1_TYPE *param, EVP_CIPHER_CTX *ctx, int en_de);
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| 14 | int EVP_PBE_CipherInit_ex(ASN1_OBJECT *pbe_obj, const char *pass, int passlen,
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| 15 | ASN1_TYPE *param, EVP_CIPHER_CTX *ctx, int en_de,
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| 16 | OSSL_LIB_CTX *libctx, const char *propq);
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| 17 |
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| 18 | int EVP_PBE_find(int type, int pbe_nid, int *pcnid, int *pmnid,
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| 19 | EVP_PBE_KEYGEN **pkeygen);
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| 20 | int EVP_PBE_find_ex(int type, int pbe_nid, int *pcnid, int *pmnid,
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| 21 | EVP_PBE_KEYGEN **pkeygen, EVP_PBE_KEYGEN_EX **keygen_ex);
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| 22 |
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| 23 | =head1 DESCRIPTION
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| 24 |
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| 25 | =head2 PBE operations
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| 26 |
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| 27 | EVP_PBE_CipherInit() and EVP_PBE_CipherInit_ex() initialise an B<EVP_CIPHER_CTX>
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| 28 | I<ctx> for encryption (I<en_de>=1) or decryption (I<en_de>=0) using the password
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| 29 | I<pass> of length I<passlen>. The PBE algorithm type and parameters are extracted
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| 30 | from an OID I<pbe_obj> and parameters I<param>.
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| 31 |
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| 32 | EVP_PBE_CipherInit_ex() also allows the application to specify a library context
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| 33 | I<libctx> and property query I<propq> to select appropriate algorithm
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| 34 | implementations.
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| 35 |
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| 36 | =head2 PBE algorithm search
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| 37 |
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| 38 | EVP_PBE_find() and EVP_PBE_find_ex() search for a matching algorithm using two parameters:
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| 39 |
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| 40 | 1. An algorithm type I<type> which can be:
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| 41 |
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| 42 | =over 4
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| 43 |
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| 44 | =item *
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| 45 |
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| 46 | EVP_PBE_TYPE_OUTER - A PBE algorithm
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| 47 |
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| 48 | =item *
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| 49 |
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| 50 | EVP_PBE_TYPE_PRF - A pseudo-random function
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| 51 |
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| 52 | =item *
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| 53 |
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| 54 | EVP_PBE_TYPE_KDF - A key derivation function
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| 55 |
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| 56 | =back
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| 57 |
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| 58 | 2. A I<pbe_nid> which can represent the algorithm identifier with parameters e.g.
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| 59 | B<NID_pbeWithSHA1AndRC2_CBC> or an algorithm class e.g. B<NID_pbes2>.
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| 60 |
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| 61 | They return the algorithm's cipher ID I<pcnid>, digest ID I<pmnid> and a key
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| 62 | generation function for the algorithm I<pkeygen>. EVP_PBE_CipherInit_ex() also
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| 63 | returns an extended key generation function I<keygen_ex> which takes a library
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| 64 | context and property query.
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| 65 |
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| 66 | If a NULL is supplied for any of I<pcnid>, I<pmnid>, I<pkeygen> or I<pkeygen_ex>
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| 67 | then this parameter is not returned.
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| 68 |
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| 69 | =head1 NOTES
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| 70 |
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| 71 | The arguments I<pbe_obj> and I<param> to EVP_PBE_CipherInit() and EVP_PBE_CipherInit_ex()
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| 72 | together form an B<X509_ALGOR> and can often be extracted directly from this structure.
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| 73 |
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| 74 | =head1 RETURN VALUES
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| 75 |
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| 76 | Return value is 1 for success and 0 if an error occurred.
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| 77 |
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| 78 | =head1 SEE ALSO
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| 79 |
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| 80 | L<PKCS5_PBE_keyivgen(3)>,
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| 81 | L<PKCS12_PBE_keyivgen_ex(3)>,
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| 82 | L<PKCS5_v2_PBE_keyivgen_ex(3)>,
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| 83 | L<PKCS12_pbe_crypt_ex(3)>,
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| 84 | L<PKCS12_create_ex(3)>
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| 85 |
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| 86 | =head1 HISTORY
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| 87 |
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| 88 | EVP_PBE_CipherInit_ex() and EVP_PBE_find_ex() were added in OpenSSL 3.0.
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| 89 |
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| 90 | =head1 COPYRIGHT
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| 91 |
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| 92 | Copyright 2021 The OpenSSL Project Authors. All Rights Reserved.
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| 93 |
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| 94 | Licensed under the Apache License 2.0 (the "License"). You may not use
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| 95 | this file except in compliance with the License. You can obtain a copy
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| 96 | in the file LICENSE in the source distribution or at
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| 97 | L<https://www.openssl.org/source/license.html>.
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| 98 |
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| 99 | =cut
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