NAME

       EVP_PKEY_print_public, EVP_PKEY_print_private, EVP_PKEY_print_params, EVP_PKEY_print_public_fp,
       EVP_PKEY_print_private_fp, EVP_PKEY_print_params_fp - public key algorithm printing routines

SYNOPSIS

        #include <openssl/evp.h>

        int EVP_PKEY_print_public(BIO *out, const EVP_PKEY *pkey,
                                  int indent, ASN1_PCTX *pctx);
        int EVP_PKEY_print_public_fp(FILE *fp, const EVP_PKEY *pkey,
                                     int indent, ASN1_PCTX *pctx);
        int EVP_PKEY_print_private(BIO *out, const EVP_PKEY *pkey,
                                   int indent, ASN1_PCTX *pctx);
        int EVP_PKEY_print_private_fp(FILE *fp, const EVP_PKEY *pkey,
                                      int indent, ASN1_PCTX *pctx);
        int EVP_PKEY_print_params(BIO *out, const EVP_PKEY *pkey,
                                  int indent, ASN1_PCTX *pctx);
        int EVP_PKEY_print_params_fp(FILE *fp, const EVP_PKEY *pkey,
                                     int indent, ASN1_PCTX *pctx);

DESCRIPTION

       The functions EVP_PKEY_print_public(), EVP_PKEY_print_private() and EVP_PKEY_print_params() print out the
       public, private or parameter components of key pkey respectively. The key is sent to BIO out in human
       readable form. The parameter indent indicates how far the printout should be indented.

       The pctx parameter allows the print output to be finely tuned by using ASN1 printing options. If pctx is
       set to NULL then default values will be used.

       The functions EVP_PKEY_print_public_fp(), EVP_PKEY_print_private_fp() and EVP_PKEY_print_params_fp() do
       the same as the BIO based functions but use FILE fp instead.

NOTES

       Currently no public key algorithms include any options in the pctx parameter.

       If the key does not include all the components indicated by the function then only those contained in the
       key will be printed. For example passing a public key to EVP_PKEY_print_private() will only print the
       public components.

RETURN VALUES

       These functions all return 1 for success and 0 or a negative value for failure.  In particular a return
       value of -2 indicates the operation is not supported by the public key algorithm.

SEE ALSO

       EVP_PKEY_CTX_new(3), EVP_PKEY_keygen(3)

HISTORY

       The functions EVP_PKEY_print_public(), EVP_PKEY_print_private(), and EVP_PKEY_print_params() were added
       in OpenSSL 1.0.0.

       The functions EVP_PKEY_print_public_fp(), EVP_PKEY_print_private_fp(), and EVP_PKEY_print_params_fp()
       were added in OpenSSL 3.0.

COPYRIGHT

       Copyright 2006-2021 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the Apache License 2.0 (the "License").  You may not use this file except in compliance
       with the License.  You can obtain a copy in the file LICENSE in the source distribution or at
       <https://www.openssl.org/source/license.html>.