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EVP_PKEY_PRINT_PRIVATE(3) Library Functions Manual EVP_PKEY_PRINT_PRIVATE(3)

EVP_PKEY_print_public, EVP_PKEY_print_private, EVP_PKEY_print_params
public key algorithm printing routines

#include <openssl/evp.h>
int
EVP_PKEY_print_public(BIO *out, 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_params(BIO *out, const EVP_PKEY *pkey, int indent, ASN1_PCTX *pctx);

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 ASN.1 printing options. If pctx is set to NULL, then default values will be used. 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.

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.

EVP_PKEY_asn1_set_public(3), EVP_PKEY_CTX_new(3), EVP_PKEY_keygen(3)

These functions first appeared in OpenSSL 1.0.0 and have been available since OpenBSD 4.9.
March 23, 2018 OpenBSD-current