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ASN1_item_d2i_bio(3)                OpenSSL               ASN1_item_d2i_bio(3)



NAME
       ASN1_item_d2i_ex, ASN1_item_d2i, ASN1_item_d2i_bio_ex,
       ASN1_item_d2i_bio, ASN1_item_d2i_fp_ex, ASN1_item_d2i_fp,
       ASN1_item_i2d_mem_bio - decode and encode DER-encoded ASN.1 structures

LIBRARY
       libcrypto, -lcrypto

SYNOPSIS
        #include <openssl/asn1.h>

        ASN1_VALUE *ASN1_item_d2i_ex(ASN1_VALUE **pval, const unsigned char **in,
                                     long len, const ASN1_ITEM *it,
                                     OSSL_LIB_CTX *libctx, const char *propq);
        ASN1_VALUE *ASN1_item_d2i(ASN1_VALUE **pval, const unsigned char **in,
                                  long len, const ASN1_ITEM *it);

        void *ASN1_item_d2i_bio_ex(const ASN1_ITEM *it, BIO *in, void *x,
                                   OSSL_LIB_CTX *libctx, const char *propq);
        void *ASN1_item_d2i_bio(const ASN1_ITEM *it, BIO *in, void *x);

        void *ASN1_item_d2i_fp_ex(const ASN1_ITEM *it, FILE *in, void *x,
                                  OSSL_LIB_CTX *libctx, const char *propq);
        void *ASN1_item_d2i_fp(const ASN1_ITEM *it, FILE *in, void *x);

        BIO *ASN1_item_i2d_mem_bio(const ASN1_ITEM *it, const ASN1_VALUE *val);

DESCRIPTION
       ASN1_item_d2i_ex() decodes the contents of the data stored in *in of
       length len which must be a DER-encoded ASN.1 structure, using the ASN.1
       template it. It places the result in *pval unless pval is NULL. If
       *pval is non-NULL on entry then the ASN1_VALUE present there will be
       reused. Otherwise a new ASN1_VALUE will be allocated. If any algorithm
       fetches are required during the process then they will use the
       OSSL_LIB_CTXprovided in the libctx parameter and the property query
       string in propq. See "ALGORITHM FETCHING" in crypto(7) for more
       information about algorithm fetching.  On exit *in will be updated to
       point to the next byte in the buffer after the decoded structure.

       ASN1_item_d2i() is the same as ASN1_item_d2i_ex() except that the
       default OSSL_LIB_CTX is used (i.e. NULL) and with a NULL property query
       string.

       ASN1_item_d2i_bio_ex() decodes the contents of its input BIO in, which
       must be a DER-encoded ASN.1 structure, using the ASN.1 template it and
       places the result in *pval unless pval is NULL. If in is NULL it
       returns NULL, else a pointer to the parsed structure. If any algorithm
       fetches are required during the process then they will use the
       OSSL_LIB_CTX provided in the libctx parameter and the property query
       string in propq. See "ALGORITHM FETCHING" in crypto(7) for more
       information about algorithm fetching.

       ASN1_item_d2i_bio() is the same as ASN1_item_d2i_bio_ex() except that
       the default OSSL_LIB_CTX is used (i.e. NULL) and with a NULL property
       query string.

       ASN1_item_d2i_fp_ex() is the same as ASN1_item_d2i_bio_ex() except that
       a FILE pointer is provided instead of a BIO.

       ASN1_item_d2i_fp() is the same as ASN1_item_d2i_fp_ex() except that the
       default OSSL_LIB_CTX is used (i.e. NULL) and with a NULL property query
       string.

       ASN1_item_i2d_mem_bio() encodes the given ASN.1 value val using the
       ASN.1 template it and returns the result in a memory BIO.

RETURN VALUES
       ASN1_item_d2i_bio() returns a pointer to an ASN1_VALUE or NULL.

       ASN1_item_i2d_mem_bio() returns a pointer to a memory BIO or NULL on
       error.

HISTORY
       The functions ASN1_item_d2i_ex(), ASN1_item_d2i_bio_ex(),
       ASN1_item_d2i_fp_ex() and ASN1_item_i2d_mem_bio() were added in OpenSSL
       3.0.

COPYRIGHT
       Copyright 2021 The OpenSSL Project Authors. All Rights Reserved.

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



3.0.12                            2023-05-07              ASN1_item_d2i_bio(3)