mirror of https://github.com/openssl/openssl
121 lines
3.7 KiB
Plaintext
121 lines
3.7 KiB
Plaintext
=pod
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=head1 NAME
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OSSL_DECODER_from_data,
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OSSL_DECODER_from_bio,
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OSSL_DECODER_from_fp
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- Routines to perform a decoding
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=head1 SYNOPSIS
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#include <openssl/decoder.h>
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int OSSL_DECODER_from_bio(OSSL_DECODER_CTX *ctx, BIO *in);
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int OSSL_DECODER_from_fp(OSSL_DECODER_CTX *ctx, FILE *fp);
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int OSSL_DECODER_from_data(OSSL_DECODER_CTX *ctx, const unsigned char **pdata,
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size_t *pdata_len);
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Feature availability macros:
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=over 4
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=item OSSL_DECODER_from_fp() is only available when B<OPENSSL_NO_STDIO>
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is undefined.
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=back
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=head1 DESCRIPTION
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OSSL_DECODER_from_data() runs the decoding process for the context I<ctx>,
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with input coming from I<*pdata>, I<*pdata_len> bytes long. Both I<*pdata>
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and I<*pdata_len> must be non-NULL. When OSSL_DECODER_from_data() returns,
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I<*pdata> is updated to point at the location after what has been decoded,
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and I<*pdata_len> to have the number of remaining bytes.
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OSSL_DECODER_from_bio() runs the decoding process for the context I<ctx>,
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with the input coming from the B<BIO> I<in>. Should it make a difference,
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it's recommended to have the BIO set in binary mode rather than text mode.
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OSSL_DECODER_from_fp() does the same thing as OSSL_DECODER_from_bio(),
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except that the input is coming from the B<FILE> I<fp>.
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=head1 RETURN VALUES
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OSSL_DECODER_from_bio(), OSSL_DECODER_from_data() and OSSL_DECODER_from_fp()
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return 1 on success, or 0 on failure.
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=head1 EXAMPLES
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To decode an RSA key encoded with PEM from a bio:
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OSSL_DECODER_CTX *dctx;
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EVP_PKEY *pkey = NULL;
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const char *format = "PEM"; /* NULL for any format */
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const char *structure = NULL; /* any structure */
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const char *keytype = "RSA"; /* NULL for any key */
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const unsigned char *pass = "my password";
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dctx = OSSL_DECODER_CTX_new_for_pkey(&pkey, format, structure,
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keytype,
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OSSL_KEYMGMT_SELECT_KEYPAIR,
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NULL, NULL);
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if (dctx == NULL) {
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/* error: no suitable potential decoders found */
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}
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if (pass != NULL)
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OSSL_DECODER_CTX_set_passphrase(dctx, pass, strlen(pass));
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if (OSSL_DECODER_from_bio(dctx, bio)) {
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/* pkey is created with the decoded data from the bio */
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} else {
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/* decoding failure */
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}
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OSSL_DECODER_CTX_free(dctx);
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To decode an EC key encoded with DER from a buffer:
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OSSL_DECODER_CTX *dctx;
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EVP_PKEY *pkey = NULL;
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const char *format = "DER"; /* NULL for any format */
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const char *structure = NULL; /* any structure */
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const char *keytype = "EC"; /* NULL for any key */
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const unsigned char *pass = NULL
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const unsigned char *data = buffer;
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size_t datalen = sizeof(buffer);
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dctx = OSSL_DECODER_CTX_new_for_pkey(&pkey, format, structure,
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keytype,
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OSSL_KEYMGMT_SELECT_KEYPAIR
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| OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS,
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NULL, NULL);
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if (dctx == NULL) {
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/* error: no suitable potential decoders found */
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}
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if (pass != NULL)
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OSSL_DECODER_CTX_set_passphrase(dctx, pass, strlen(pass));
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if (OSSL_DECODER_from_data(dctx, &data, &datalen)) {
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/* pkey is created with the decoded data from the buffer */
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} else {
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/* decoding failure */
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}
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OSSL_DECODER_CTX_free(dctx);
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=head1 SEE ALSO
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L<provider(7)>, L<OSSL_DECODER_CTX(3)>
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=head1 HISTORY
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The functions described here were added in OpenSSL 3.0.
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=head1 COPYRIGHT
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Copyright 2020-2023 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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