=pod
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=head1 NAME
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EVP_PKEY_print_public, EVP_PKEY_print_private, EVP_PKEY_print_params - public key algorithm printing routines.
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=head1 SYNOPSIS
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#include <openssl/evp.h>
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int EVP_PKEY_print_public(BIO *out, const EVP_PKEY *pkey,
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int indent, ASN1_PCTX *pctx);
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int EVP_PKEY_print_private(BIO *out, const EVP_PKEY *pkey,
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int indent, ASN1_PCTX *pctx);
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int EVP_PKEY_print_params(BIO *out, const EVP_PKEY *pkey,
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int indent, ASN1_PCTX *pctx);
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=head1 DESCRIPTION
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The functions EVP_PKEY_print_public(), EVP_PKEY_print_private() and
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EVP_PKEY_print_params() print out the public, private or parameter components
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of key B<pkey> respectively. The key is sent to BIO B<out> in human readable
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form. The parameter B<indent> indicated how far the printout should be indented.
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The B<pctx> parameter allows the print output to be finely tuned by using
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ASN1 printing options. If B<pctx> is set to NULL then default values will
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be used.
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=head1 NOTES
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Currently no public key algorithms include any options in the B<pctx> parameter
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parameter.
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If the key does not include all the components indicated by the function then
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only those contained in the key will be printed. For example passing a public
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key to EVP_PKEY_print_private() will only print the public components.
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=head1 RETURN VALUES
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These functions all return 1 for success and 0 or a negative value for failure.
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In particular a return value of -2 indicates the operation is not supported by
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the public key algorithm.
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=head1 SEE ALSO
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L<EVP_PKEY_CTX_new(3)|EVP_PKEY_CTX_new(3)>,
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L<EVP_PKEY_keygen(3)|EVP_PKEY_keygen(3)>
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=head1 HISTORY
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These functions were first added to OpenSSL 1.0.0.
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=cut
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