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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "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 .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include \& \& 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 .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBASN1_item_d2i_ex()\fR decodes the contents of the data stored in \fI*in\fR of length \&\fIlen\fR which must be a DER-encoded \s-1ASN.1\s0 structure, using the \s-1ASN.1\s0 template \&\fIit\fR. It places the result in \fI*pval\fR unless \fIpval\fR is \s-1NULL.\s0 If \fI*pval\fR is non-NULL on entry then the \fB\s-1ASN1_VALUE\s0\fR present there will be reused. Otherwise a new \fB\s-1ASN1_VALUE\s0\fR will be allocated. If any algorithm fetches are required during the process then they will use the \fB\s-1OSSL_LIB_CTX\s0\fRprovided in the \&\fIlibctx\fR parameter and the property query string in \fIpropq\fR. See \&\*(L"\s-1ALGORITHM FETCHING\*(R"\s0 in \fBcrypto\fR\|(7) for more information about algorithm fetching. On exit \fI*in\fR will be updated to point to the next byte in the buffer after the decoded structure. .PP \&\fBASN1_item_d2i()\fR is the same as \fBASN1_item_d2i_ex()\fR 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. .PP \&\fBASN1_item_d2i_bio_ex()\fR decodes the contents of its input \s-1BIO\s0 \fIin\fR, which must be a DER-encoded \s-1ASN.1\s0 structure, using the \s-1ASN.1\s0 template \fIit\fR and places the result in \fI*pval\fR unless \fIpval\fR is \s-1NULL.\s0 If \fIin\fR 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\fR provided in the \fIlibctx\fR parameter and the property query string in \fIpropq\fR. See \*(L"\s-1ALGORITHM FETCHING\*(R"\s0 in \fBcrypto\fR\|(7) for more information about algorithm fetching. .PP \&\fBASN1_item_d2i_bio()\fR is the same as \fBASN1_item_d2i_bio_ex()\fR except that the default \fB\s-1OSSL_LIB_CTX\s0\fR is used (i.e. \s-1NULL\s0) and with a \s-1NULL\s0 property query string. .PP \&\fBASN1_item_d2i_fp_ex()\fR is the same as \fBASN1_item_d2i_bio_ex()\fR except that a \s-1FILE\s0 pointer is provided instead of a \s-1BIO.\s0 .PP \&\fBASN1_item_d2i_fp()\fR is the same as \fBASN1_item_d2i_fp_ex()\fR except that the default \fB\s-1OSSL_LIB_CTX\s0\fR is used (i.e. \s-1NULL\s0) and with a \s-1NULL\s0 property query string. .PP \&\fBASN1_item_i2d_mem_bio()\fR encodes the given \s-1ASN.1\s0 value \fIval\fR using the \s-1ASN.1\s0 template \fIit\fR and returns the result in a memory \s-1BIO.\s0 .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBASN1_item_d2i_bio()\fR returns a pointer to an \fB\s-1ASN1_VALUE\s0\fR or \s-1NULL.\s0 .PP \&\fBASN1_item_i2d_mem_bio()\fR returns a pointer to a memory \s-1BIO\s0 or \s-1NULL\s0 on error. .SH "HISTORY" .IX Header "HISTORY" The functions \fBASN1_item_d2i_ex()\fR, \fBASN1_item_d2i_bio_ex()\fR, \fBASN1_item_d2i_fp_ex()\fR and \fBASN1_item_i2d_mem_bio()\fR were added in OpenSSL 3.0. .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2021 The OpenSSL Project Authors. All Rights Reserved. .PP 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 .