1OSSL_DECODER_FROM_BIO(3ossl)        OpenSSL       OSSL_DECODER_FROM_BIO(3ossl)
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NAME

6       OSSL_DECODER_from_data, OSSL_DECODER_from_bio, OSSL_DECODER_from_fp -
7       Routines to perform a decoding
8

SYNOPSIS

10        #include <openssl/decoder.h>
11
12        int OSSL_DECODER_from_bio(OSSL_DECODER_CTX *ctx, BIO *in);
13        int OSSL_DECODER_from_fp(OSSL_DECODER_CTX *ctx, FILE *fp);
14        int OSSL_DECODER_from_data(OSSL_DECODER_CTX *ctx, const unsigned char **pdata,
15                                   size_t *pdata_len);
16
17       Feature availability macros:
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19       OSSL_DECODER_from_fp() is only available when OPENSSL_NO_STDIO is
20       undefined.
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DESCRIPTION

23       OSSL_DECODER_from_data() runs the decoding process for the context ctx,
24       with input coming from *pdata, *pdata_len bytes long.  Both *pdata and
25       *pdata_len must be non-NULL.  When OSSL_DECODER_from_data() returns,
26       *pdata is updated to point at the location after what has been decoded,
27       and *pdata_len to have the number of remaining bytes.
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29       OSSL_DECODER_from_bio() runs the decoding process for the context ctx,
30       with the input coming from the BIO in.  Should it make a difference,
31       it's recommended to have the BIO set in binary mode rather than text
32       mode.
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34       OSSL_DECODER_from_fp() does the same thing as OSSL_DECODER_from_bio(),
35       except that the input is coming from the FILE fp.
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RETURN VALUES

38       OSSL_DECODER_from_bio(), OSSL_DECODER_from_data() and
39       OSSL_DECODER_from_fp() return 1 on success, or 0 on failure.
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EXAMPLES

42       To decode an RSA key encoded with PEM from a bio:
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44        OSSL_DECODER_CTX *dctx;
45        EVP_PKEY *pkey = NULL;
46        const char *format = "PEM";   /* NULL for any format */
47        const char *structure = NULL; /* any structure */
48        const char *keytype = "RSA";  /* NULL for any key */
49        const unsigned char *pass = "my password";
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51        dctx = OSSL_DECODER_CTX_new_for_pkey(&pkey, format, structure,
52                                             keytype,
53                                             OSSL_KEYMGMT_SELECT_KEYPAIR,
54                                             NULL, NULL);
55        if (dctx == NULL) {
56            /* error: no suitable potential decoders found */
57        }
58        if (pass != NULL)
59            OSSL_DECODER_CTX_set_passphrase(dctx, pass, strlen(pass));
60        if (OSSL_DECODER_from_bio(dctx, bio)) {
61            /* pkey is created with the decoded data from the bio */
62        } else {
63            /* decoding failure */
64        }
65        OSSL_DECODER_CTX_free(dctx);
66
67       To decode an EC key encoded with DER from a buffer:
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69        OSSL_DECODER_CTX *dctx;
70        EVP_PKEY *pkey = NULL;
71        const char *format = "DER";   /* NULL for any format */
72        const char *structure = NULL; /* any structure */
73        const char *keytype = "EC";   /* NULL for any key */
74        const unsigned char *pass = NULL
75        const unsigned char *data = buffer;
76        size_t datalen = sizeof(buffer);
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78        dctx = OSSL_DECODER_CTX_new_for_pkey(&pkey, format, structure,
79                                             keytype,
80                                             OSSL_KEYMGMT_SELECT_KEYPAIR
81                                             | OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS,
82                                             NULL, NULL);
83        if (dctx == NULL) {
84            /* error: no suitable potential decoders found */
85        }
86        if (pass != NULL)
87            OSSL_DECODER_CTX_set_passphrase(dctx, pass, strlen(pass));
88        if (OSSL_DECODER_from_data(dctx, &data, &datalen)) {
89            /* pkey is created with the decoded data from the buffer */
90        } else {
91            /* decoding failure */
92        }
93        OSSL_DECODER_CTX_free(dctx);
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SEE ALSO

96       provider(7), OSSL_DECODER_CTX(3)
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HISTORY

99       The functions described here were added in OpenSSL 3.0.
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102       Copyright 2020-2023 The OpenSSL Project Authors. All Rights Reserved.
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104       Licensed under the Apache License 2.0 (the "License").  You may not use
105       this file except in compliance with the License.  You can obtain a copy
106       in the file LICENSE in the source distribution or at
107       <https://www.openssl.org/source/license.html>.
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1113.1.1                             2023-08-31      OSSL_DECODER_FROM_BIO(3ossl)
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