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Title "OSSL_ENCODER_TO_BIO 3ossl" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
OSSL_ENCODER_to_data, OSSL_ENCODER_to_bio, OSSL_ENCODER_to_fp \- Routines to perform an encoding Header "SYNOPSIS" .Vb 1 #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); .Ve

Feature availability macros:

Item "OSSL_ENCODER_to_fp() is only available when OPENSSL_NO_STDIO is undefined." Header "DESCRIPTION" \fBOSSL_ENCODER_to_data() runs the encoding process for the context ctx, with the output going to the *pdata and *pdata_len. If *pdata is \s-1NULL\s0 when OSSL_ENCODER_to_data() is called, a buffer will be allocated using OPENSSL_zalloc\|(3), and *pdata will be set to point at the start of that buffer, and *pdata_len will be assigned its length when \fBOSSL_ENCODER_to_data() returns. If *pdata is non-NULL when OSSL_ENCODER_to_data() is called, *pdata_len is assumed to have its size. In this case, *pdata will be set to point after the encoded bytes, and *pdata_len will be assigned the number of remaining bytes.

\fBOSSL_ENCODER_to_bio() runs the encoding process for the context ctx, with the output going to the \s-1BIO\s0 out.

\fBOSSL_ENCODER_to_fp() does the same thing as OSSL_ENCODER_to_bio(), except that the output is going to the \s-1FILE\s0 fp.

For OSSL_ENCODER_to_bio() and OSSL_ENCODER_to_fp(), the application is required to set up the \s-1BIO\s0 or \s-1FILE\s0 properly, for example to have it in text or binary mode as is appropriate for the encoder output type.

Header "RETURN VALUES" \fBOSSL_ENCODER_to_bio(), OSSL_ENCODER_to_fp() and OSSL_ENCODER_to_data() return 1 on success, or 0 on failure. Header "EXAMPLES" To encode a pkey as PKCS#8 with \s-1PEM\s0 format into a bio:

.Vb 4 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); .Ve

To encode a pkey as PKCS#8 with \s-1DER\s0 format encrypted with \s-1AES-256-CBC\s0 into a buffer:

.Vb 6 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); .Ve

Header "SEE ALSO" \fBprovider\|(7), \s-1OSSL_ENCODER_CTX\s0\|(3) Header "HISTORY" The functions described here were added in OpenSSL 3.0. Header "COPYRIGHT" Copyright 2019-2021 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.