5 ASN1_item_d2i_ex, ASN1_item_d2i, ASN1_item_d2i_bio_ex, ASN1_item_d2i_bio,
6 ASN1_item_d2i_fp_ex, ASN1_item_d2i_fp, ASN1_item_i2d_mem_bio
7 - decode and encode DER-encoded ASN.1 structures
11 #include <openssl/asn1.h>
13 ASN1_VALUE *ASN1_item_d2i_ex(ASN1_VALUE **val, 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 **val, const unsigned char **in,
17 long len, const ASN1_ITEM *it);
19 void *ASN1_item_d2i_bio_ex(const ASN1_ITEM *it, BIO *in, void *pval,
20 OSSL_LIB_CTX *libctx, const char *propq);
21 void *ASN1_item_d2i_bio(const ASN1_ITEM *it, BIO *in, void *pval);
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);
27 BIO *ASN1_item_i2d_mem_bio(const ASN1_ITEM *it, const ASN1_VALUE *val);
31 ASN1_item_d2i_ex() decodes the contents of the data stored in I<*in> of length
32 I<len> which must be a DER-encoded ASN.1 structure, using the ASN.1 template
33 I<it>. It places the result in I<*pval> unless I<pval> is NULL. If I<*pval> is
34 non-NULL on entry then the B<ASN1_VALUE> present there will be reused. Otherwise
35 a new B<ASN1_VALUE> will be allocated. If any algorithm fetches are required
36 during the process then they will use the B<OSSL_LIB_CTX>provided in the
37 I<libctx> parameter and the property query string in I<propq>. See
38 L<crypto(7)/ALGORITHM FETCHING> for more information about algorithm fetching.
39 On exit I<*in> will be updated to point to the next byte in the buffer after the
42 ASN1_item_d2i() is the same as ASN1_item_d2i_ex() except that the default
43 OSSL_LIB_CTX is used (i.e. NULL) and with a NULL property query string.
45 ASN1_item_d2i_bio_ex() decodes the contents of its input BIO I<in>,
46 which must be a DER-encoded ASN.1 structure, using the ASN.1 template I<it>
47 and places the result in I<*pval> unless I<pval> is NULL.
48 If I<in> is NULL it returns NULL, else a pointer to the parsed structure. If any
49 algorithm fetches are required during the process then they will use the
50 B<OSSL_LIB_CTX> provided in the I<libctx> parameter and the property query
51 string in I<propq>. See L<crypto(7)/ALGORITHM FETCHING> for more information
52 about algorithm fetching.
54 ASN1_item_d2i_bio() is the same as ASN1_item_d2i_bio_ex() except that the
55 default B<OSSL_LIB_CTX> is used (i.e. NULL) and with a NULL property query
58 ASN1_item_d2i_fp_ex() is the same as ASN1_item_d2i_bio_ex() except that a FILE
59 pointer is provided instead of a BIO.
61 ASN1_item_d2i_fp() is the same as ASN1_item_d2i_fp_ex() except that the
62 default B<OSSL_LIB_CTX> is used (i.e. NULL) and with a NULL property query
65 ASN1_item_i2d_mem_bio() encodes the given ASN.1 value I<val>
66 using the ASN.1 template I<it> and returns the result in a memory BIO.
70 ASN1_item_d2i_bio() returns a pointer to an B<ASN1_VALUE> or NULL.
72 ASN1_item_i2d_mem_bio() returns a pointer to a memory BIO or NULL on error.
76 The functions ASN1_item_d2i_ex(), ASN1_item_d2i_bio_ex(), ASN1_item_d2i_fp_ex()
77 and ASN1_item_i2d_mem_bio() were added in OpenSSL 3.0.
81 Copyright 2021 The OpenSSL Project Authors. All Rights Reserved.
83 Licensed under the Apache License 2.0 (the "License"). You may not use
84 this file except in compliance with the License. You can obtain a copy
85 in the file LICENSE in the source distribution or at
86 L<https://www.openssl.org/source/license.html>.