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.\" ========================================================================
.\"
.IX Title "OSSL_DECODER_FROM_BIO 3ossl"
.TH OSSL_DECODER_FROM_BIO 3ossl "2023-09-19" "3.0.11" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
OSSL_DECODER_from_data,
OSSL_DECODER_from_bio,
OSSL_DECODER_from_fp
\&\- Routines to perform a decoding
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/decoder.h>
\&
\& int OSSL_DECODER_from_bio(OSSL_DECODER_CTX *ctx, BIO *in);
\& int OSSL_DECODER_from_fp(OSSL_DECODER_CTX *ctx, FILE *fp);
\& int OSSL_DECODER_from_data(OSSL_DECODER_CTX *ctx, const unsigned char **pdata,
\&                            size_t *pdata_len);
.Ve
.PP
Feature availability macros:
.IP "\fBOSSL_DECODER_from_fp()\fR is only available when \fB\s-1OPENSSL_NO_STDIO\s0\fR is undefined." 4
.IX Item "OSSL_DECODER_from_fp() is only available when OPENSSL_NO_STDIO is undefined."
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBOSSL_DECODER_from_data()\fR runs the decoding process for the context \fIctx\fR,
with input coming from \fI*pdata\fR, \fI*pdata_len\fR bytes long.  Both \fI*pdata\fR
and \fI*pdata_len\fR must be non-NULL.  When \fBOSSL_DECODER_from_data()\fR returns,
\&\fI*pdata\fR is updated to point at the location after what has been decoded,
and \fI*pdata_len\fR to have the number of remaining bytes.
.PP
\&\fBOSSL_DECODER_from_bio()\fR runs the decoding process for the context \fIctx\fR,
with the input coming from the \fB\s-1BIO\s0\fR \fIin\fR.  Should it make a difference,
it's recommended to have the \s-1BIO\s0 set in binary mode rather than text mode.
.PP
\&\fBOSSL_DECODER_from_fp()\fR does the same thing as \fBOSSL_DECODER_from_bio()\fR,
except that the input is coming from the \fB\s-1FILE\s0\fR \fIfp\fR.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBOSSL_DECODER_from_bio()\fR, \fBOSSL_DECODER_from_data()\fR and \fBOSSL_DECODER_from_fp()\fR
return 1 on success, or 0 on failure.
.SH "EXAMPLES"
.IX Header "EXAMPLES"
To decode an \s-1RSA\s0 key encoded with \s-1PEM\s0 from a bio:
.PP
.Vb 6
\& OSSL_DECODER_CTX *dctx;
\& EVP_PKEY *pkey = NULL;
\& const char *format = "PEM";   /* NULL for any format */
\& const char *structure = NULL; /* any structure */
\& const char *keytype = "RSA";  /* NULL for any key */
\& const unsigned char *pass = "my password";
\&
\& dctx = OSSL_DECODER_CTX_new_for_pkey(&pkey, format, structure,
\&                                      keytype,
\&                                      OSSL_KEYMGMT_SELECT_KEYPAIR,
\&                                      NULL, NULL);
\& if (dctx == NULL) {
\&     /* error: no suitable potential decoders found */
\& }
\& if (pass != NULL)
\&     OSSL_DECODER_CTX_set_passphrase(dctx, pass, strlen(pass));
\& if (OSSL_DECODER_from_bio(dctx, bio)) {
\&     /* pkey is created with the decoded data from the bio */
\& } else {
\&     /* decoding failure */
\& }
\& OSSL_DECODER_CTX_free(dctx);
.Ve
.PP
To decode an \s-1EC\s0 key encoded with \s-1DER\s0 from a buffer:
.PP
.Vb 8
\& OSSL_DECODER_CTX *dctx;
\& EVP_PKEY *pkey = NULL;
\& const char *format = "DER";   /* NULL for any format */
\& const char *structure = NULL; /* any structure */
\& const char *keytype = "EC";   /* NULL for any key */
\& const unsigned char *pass = NULL
\& const unsigned char *data = buffer;
\& size_t datalen = sizeof(buffer);
\&
\& dctx = OSSL_DECODER_CTX_new_for_pkey(&pkey, format, structure,
\&                                      keytype,
\&                                      OSSL_KEYMGMT_SELECT_KEYPAIR
\&                                      | OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS,
\&                                      NULL, NULL);
\& if (dctx == NULL) {
\&     /* error: no suitable potential decoders found */
\& }
\& if (pass != NULL)
\&     OSSL_DECODER_CTX_set_passphrase(dctx, pass, strlen(pass));
\& if (OSSL_DECODER_from_data(dctx, &data, &datalen)) {
\&     /* pkey is created with the decoded data from the buffer */
\& } else {
\&     /* decoding failure */
\& }
\& OSSL_DECODER_CTX_free(dctx);
.Ve
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBprovider\fR\|(7), \s-1\fBOSSL_DECODER_CTX\s0\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
The functions described here were added in OpenSSL 3.0.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2020\-2023 The OpenSSL Project Authors. All Rights Reserved.
.PP
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>.