#include <openssl/encoder.h> int OSSL_ENCODER_to_data(OSSL_ENCODER_CTX *ctx, unsigned char **pdata, size_t *pdata_len); int OSSL_ENCODER_to_bio(OSSL_ENCODER_CTX *ctx, BIO *out); int OSSL_ENCODER_to_fp(OSSL_ENCODER_CTX *ctx, FILE *fp);
Feature availability macros:
OSSL_ENCODER_to_bio() runs the encoding process for the context ctx, with the output going to the BIO out.
OSSL_ENCODER_to_fp() does the same thing as OSSL_ENCODER_to_bio(), except that the output is going to the FILE fp.
For OSSL_ENCODER_to_bio() and OSSL_ENCODER_to_fp(), the application is required to set up the BIO or FILE properly, for example to have it in text or binary mode as is appropriate for the encoder output type.
OSSL_ENCODER_CTX *ectx; const char *format = "PEM"; const char *structure = "PrivateKeyInfo"; /* PKCS#8 structure */ const unsigned char *pass = "my password"; ectx = OSSL_ENCODER_CTX_new_for_pkey(pkey, OSSL_KEYMGMT_SELECT_KEYPAIR | OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS, format, structure, NULL); if (ectx == NULL) { /* error: no suitable potential encoders found */ } if (pass != NULL) OSSL_ENCODER_CTX_set_passphrase(ectx, pass, strlen(pass)); if (OSSL_ENCODER_to_bio(ectx, bio)) { /* pkey was successfully encoded into the bio */ } else { /* encoding failure */ } OSSL_ENCODER_CTX_free(ectx);
To encode a pkey as PKCS#8 with DER format encrypted with AES-256-CBC into a buffer:
OSSL_ENCODER_CTX *ectx; const char *format = "DER"; const char *structure = "PrivateKeyInfo"; /* PKCS#8 structure */ const unsigned char *pass = "my password"; unsigned char *data = NULL; size_t datalen; ectx = OSSL_ENCODER_CTX_new_for_pkey(pkey, OSSL_KEYMGMT_SELECT_KEYPAIR | OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS, format, structure, NULL); if (ectx == NULL) { /* error: no suitable potential encoders found */ } if (pass != NULL) { OSSL_ENCODER_CTX_set_passphrase(ectx, pass, strlen(pass)); OSSL_ENCODER_CTX_set_cipher(ctx, "AES-256-CBC", NULL); } if (OSSL_ENCODER_to_data(ectx, &data, &datalen)) { /* * pkey was successfully encoded into a newly allocated * data buffer */ } else { /* encoding failure */ } OSSL_ENCODER_CTX_free(ectx);
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>.