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Title "ASN1_ITEM_D2I_BIO 3ossl" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
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 Header "SYNOPSIS" .Vb 1 #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); .Ve Header "DESCRIPTION" \fBASN1_item_d2i_ex() decodes the contents of the data stored in *in of length \fIlen which must be a DER-encoded \s-1ASN.1\s0 structure, using the \s-1ASN.1\s0 template \fIit. It places the result in *pval unless pval is \s-1NULL.\s0 If *pval is non-NULL on entry then the \s-1ASN1_VALUE\s0 present there will be reused. Otherwise a new \s-1ASN1_VALUE\s0 will be allocated. If any algorithm fetches are required during the process then they will use the \s-1OSSL_LIB_CTX\s0provided in the \fIlibctx parameter and the property query string in propq. See \*(L"\s-1ALGORITHM FETCHING\*(R"\s0 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.

\fBASN1_item_d2i() is the same as ASN1_item_d2i_ex() except that the default \s-1OSSL_LIB_CTX\s0 is used (i.e. \s-1NULL\s0) and with a \s-1NULL\s0 property query string.

\fBASN1_item_d2i_bio_ex() decodes the contents of its input \s-1BIO\s0 in, which must be a DER-encoded \s-1ASN.1\s0 structure, using the \s-1ASN.1\s0 template it and places the result in *pval unless pval is \s-1NULL.\s0 If in is \s-1NULL\s0 it returns \s-1NULL,\s0 else a pointer to the parsed structure. If any algorithm fetches are required during the process then they will use the \fB\s-1OSSL_LIB_CTX\s0 provided in the libctx parameter and the property query string in propq. See \*(L"\s-1ALGORITHM FETCHING\*(R"\s0 in crypto\|(7) for more information about algorithm fetching.

\fBASN1_item_d2i_bio() is the same as ASN1_item_d2i_bio_ex() except that the default \s-1OSSL_LIB_CTX\s0 is used (i.e. \s-1NULL\s0) and with a \s-1NULL\s0 property query string.

\fBASN1_item_d2i_fp_ex() is the same as ASN1_item_d2i_bio_ex() except that a \s-1FILE\s0 pointer is provided instead of a \s-1BIO.\s0

\fBASN1_item_d2i_fp() is the same as ASN1_item_d2i_fp_ex() except that the default \s-1OSSL_LIB_CTX\s0 is used (i.e. \s-1NULL\s0) and with a \s-1NULL\s0 property query string.

\fBASN1_item_i2d_mem_bio() encodes the given \s-1ASN.1\s0 value val using the \s-1ASN.1\s0 template it and returns the result in a memory \s-1BIO.\s0

Header "RETURN VALUES" \fBASN1_item_d2i_bio() returns a pointer to an \s-1ASN1_VALUE\s0 or \s-1NULL.\s0

\fBASN1_item_i2d_mem_bio() returns a pointer to a memory \s-1BIO\s0 or \s-1NULL\s0 on error.

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

Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.