1ASN1_ITEM_D2I_BIO(3ossl)            OpenSSL           ASN1_ITEM_D2I_BIO(3ossl)
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NAME

6       ASN1_item_d2i_ex, ASN1_item_d2i, ASN1_item_d2i_bio_ex,
7       ASN1_item_d2i_bio, ASN1_item_d2i_fp_ex, ASN1_item_d2i_fp,
8       ASN1_item_i2d_mem_bio - decode and encode DER-encoded ASN.1 structures
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SYNOPSIS

11        #include <openssl/asn1.h>
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13        ASN1_VALUE *ASN1_item_d2i_ex(ASN1_VALUE **pval, const unsigned char **in,
14                                     long len, const ASN1_ITEM *it,
15                                     OSSL_LIB_CTX *libctx, const char *propq);
16        ASN1_VALUE *ASN1_item_d2i(ASN1_VALUE **pval, const unsigned char **in,
17                                  long len, const ASN1_ITEM *it);
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19        void *ASN1_item_d2i_bio_ex(const ASN1_ITEM *it, BIO *in, void *x,
20                                   OSSL_LIB_CTX *libctx, const char *propq);
21        void *ASN1_item_d2i_bio(const ASN1_ITEM *it, BIO *in, void *x);
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23        void *ASN1_item_d2i_fp_ex(const ASN1_ITEM *it, FILE *in, void *x,
24                                  OSSL_LIB_CTX *libctx, const char *propq);
25        void *ASN1_item_d2i_fp(const ASN1_ITEM *it, FILE *in, void *x);
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27        BIO *ASN1_item_i2d_mem_bio(const ASN1_ITEM *it, const ASN1_VALUE *val);
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DESCRIPTION

30       ASN1_item_d2i_ex() decodes the contents of the data stored in *in of
31       length len which must be a DER-encoded ASN.1 structure, using the ASN.1
32       template it. It places the result in *pval unless pval is NULL. If
33       *pval is non-NULL on entry then the ASN1_VALUE present there will be
34       reused. Otherwise a new ASN1_VALUE will be allocated. If any algorithm
35       fetches are required during the process then they will use the
36       OSSL_LIB_CTXprovided in the libctx parameter and the property query
37       string in propq. See "ALGORITHM FETCHING" in crypto(7) for more
38       information about algorithm fetching.  On exit *in will be updated to
39       point to the next byte in the buffer after the decoded structure.
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41       ASN1_item_d2i() is the same as ASN1_item_d2i_ex() except that the
42       default OSSL_LIB_CTX is used (i.e. NULL) and with a NULL property query
43       string.
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45       ASN1_item_d2i_bio_ex() decodes the contents of its input BIO in, which
46       must be a DER-encoded ASN.1 structure, using the ASN.1 template it and
47       places the result in *pval unless pval is NULL.  If in is NULL it
48       returns NULL, else a pointer to the parsed structure. If any algorithm
49       fetches are required during the process then they will use the
50       OSSL_LIB_CTX provided in the libctx parameter and the property query
51       string in propq. See "ALGORITHM FETCHING" in crypto(7) for more
52       information about algorithm fetching.
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54       ASN1_item_d2i_bio() is the same as ASN1_item_d2i_bio_ex() except that
55       the default OSSL_LIB_CTX is used (i.e. NULL) and with a NULL property
56       query string.
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58       ASN1_item_d2i_fp_ex() is the same as ASN1_item_d2i_bio_ex() except that
59       a FILE pointer is provided instead of a BIO.
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61       ASN1_item_d2i_fp() is the same as ASN1_item_d2i_fp_ex() except that the
62       default OSSL_LIB_CTX is used (i.e. NULL) and with a NULL property query
63       string.
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65       ASN1_item_i2d_mem_bio() encodes the given ASN.1 value val using the
66       ASN.1 template it and returns the result in a memory BIO.
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RETURN VALUES

69       ASN1_item_d2i_bio() returns a pointer to an ASN1_VALUE or NULL.
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71       ASN1_item_i2d_mem_bio() returns a pointer to a memory BIO or NULL on
72       error.
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HISTORY

75       The functions ASN1_item_d2i_ex(), ASN1_item_d2i_bio_ex(),
76       ASN1_item_d2i_fp_ex() and ASN1_item_i2d_mem_bio() were added in OpenSSL
77       3.0.
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80       Copyright 2021 The OpenSSL Project Authors. All Rights Reserved.
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82       Licensed under the Apache License 2.0 (the "License").  You may not use
83       this file except in compliance with the License.  You can obtain a copy
84       in the file LICENSE in the source distribution or at
85       <https://www.openssl.org/source/license.html>.
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893.0.5                             2022-11-01          ASN1_ITEM_D2I_BIO(3ossl)
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