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      1 =pod
      2 
      3 =head1 NAME
      4 
      5 EVP_PKEY_print_public, EVP_PKEY_print_private, EVP_PKEY_print_params,
      6 EVP_PKEY_print_public_fp, EVP_PKEY_print_private_fp,
      7 EVP_PKEY_print_params_fp - public key algorithm printing routines
      8 
      9 =head1 SYNOPSIS
     10 
     11  #include <openssl/evp.h>
     12 
     13  int EVP_PKEY_print_public(BIO *out, const EVP_PKEY *pkey,
     14                            int indent, ASN1_PCTX *pctx);
     15  int EVP_PKEY_print_public_fp(FILE *fp, const EVP_PKEY *pkey,
     16                               int indent, ASN1_PCTX *pctx);
     17  int EVP_PKEY_print_private(BIO *out, const EVP_PKEY *pkey,
     18                             int indent, ASN1_PCTX *pctx);
     19  int EVP_PKEY_print_private_fp(FILE *fp, const EVP_PKEY *pkey,
     20                                int indent, ASN1_PCTX *pctx);
     21  int EVP_PKEY_print_params(BIO *out, const EVP_PKEY *pkey,
     22                            int indent, ASN1_PCTX *pctx);
     23  int EVP_PKEY_print_params_fp(FILE *fp, const EVP_PKEY *pkey,
     24                               int indent, ASN1_PCTX *pctx);
     25 
     26 =head1 DESCRIPTION
     27 
     28 The functions EVP_PKEY_print_public(), EVP_PKEY_print_private() and
     29 EVP_PKEY_print_params() print out the public, private or parameter components
     30 of key I<pkey> respectively. The key is sent to B<BIO> I<out> in human readable
     31 form. The parameter I<indent> indicates how far the printout should be indented.
     32 
     33 The I<pctx> parameter allows the print output to be finely tuned by using
     34 ASN1 printing options. If I<pctx> is set to NULL then default values will
     35 be used.
     36 
     37 The functions EVP_PKEY_print_public_fp(), EVP_PKEY_print_private_fp() and
     38 EVP_PKEY_print_params_fp() do the same as the B<BIO> based functions
     39 but use B<FILE> I<fp> instead.
     40 
     41 =head1 NOTES
     42 
     43 Currently no public key algorithms include any options in the I<pctx> parameter.
     44 
     45 If the key does not include all the components indicated by the function then
     46 only those contained in the key will be printed. For example passing a public
     47 key to EVP_PKEY_print_private() will only print the public components.
     48 
     49 =head1 RETURN VALUES
     50 
     51 These functions all return 1 for success and 0 or a negative value for failure.
     52 In particular a return value of -2 indicates the operation is not supported by
     53 the public key algorithm.
     54 
     55 =head1 SEE ALSO
     56 
     57 L<EVP_PKEY_CTX_new(3)>,
     58 L<EVP_PKEY_keygen(3)>
     59 
     60 =head1 HISTORY
     61 
     62 The functions EVP_PKEY_print_public(), EVP_PKEY_print_private(),
     63 and EVP_PKEY_print_params() were added in OpenSSL 1.0.0.
     64 
     65 The functions EVP_PKEY_print_public_fp(), EVP_PKEY_print_private_fp(),
     66 and EVP_PKEY_print_params_fp() were added in OpenSSL 3.0.
     67 
     68 =head1 COPYRIGHT
     69 
     70 Copyright 2006-2021 The OpenSSL Project Authors. All Rights Reserved.
     71 
     72 Licensed under the Apache License 2.0 (the "License").  You may not use
     73 this file except in compliance with the License.  You can obtain a copy
     74 in the file LICENSE in the source distribution or at
     75 L<https://www.openssl.org/source/license.html>.
     76 
     77 =cut
     78