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Title "SMIME_READ_ASN1 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
SMIME_read_ASN1_ex, SMIME_read_ASN1 \- parse S/MIME message Header "SYNOPSIS" .Vb 1 #include <openssl/asn1.h> \& ASN1_VALUE *SMIME_read_ASN1_ex(BIO *in, int flags, BIO **bcont, const ASN1_ITEM *it, ASN1_VALUE **x, OSSL_LIB_CTX *libctx, const char *propq); ASN1_VALUE *SMIME_read_ASN1(BIO *in, BIO **bcont, const ASN1_ITEM *it); .Ve Header "DESCRIPTION" \fBSMIME_read_ASN1_ex() parses a message in S/MIME format.

\fIin is a \s-1BIO\s0 to read the message from. If the flags argument contains \s-1CMS_BINARY\s0 then the input is assumed to be in binary format and is not translated to canonical form. If in addition \s-1SMIME_ASCIICRLF\s0 is set then the binary input is assumed to be followed by \s-1CR\s0 and \s-1LF\s0 characters, else only by an \s-1LF\s0 character. \fIx can be used to optionally supply a previously created it \s-1ASN1_VALUE\s0 object (such as CMS_ContentInfo or \s-1PKCS7\s0), it can be set to \s-1NULL.\s0 Valid values that can be used by \s-1ASN.1\s0 structure it are ASN1_ITEM_rptr(\s-1PKCS7\s0) or ASN1_ITEM_rptr(CMS_ContentInfo). Any algorithm fetches that occur during the operation will use the \s-1OSSL_LIB_CTX\s0 supplied in the libctx parameter, and use the property query string propq See \*(L"\s-1ALGORITHM FETCHING\*(R"\s0 in crypto\|(7) for further details about algorithm fetching.

If cleartext signing is used then the content is saved in a memory bio which is written to *bcont, otherwise *bcont is set to \s-1NULL.\s0

The parsed \s-1ASN1_VALUE\s0 structure is returned or \s-1NULL\s0 if an error occurred.

\fBSMIME_read_ASN1() is similar to SMIME_read_ASN1_ex() but sets the value of x to \s-1NULL\s0 and the value of flags to 0.

Header "NOTES" The higher level functions SMIME_read_CMS_ex\|(3) and \fBSMIME_read_PKCS7_ex\|(3) should be used instead of SMIME_read_ASN1_ex().

To support future functionality if bcont is not \s-1NULL\s0 *bcont should be initialized to \s-1NULL.\s0

Header "BUGS" The \s-1MIME\s0 parser used by SMIME_read_ASN1_ex() is somewhat primitive. While it will handle most S/MIME messages more complex compound formats may not work.

The use of a memory \s-1BIO\s0 to hold the signed content limits the size of message which can be processed due to memory restraints: a streaming single pass option should be available.

Header "RETURN VALUES" \fBSMIME_read_ASN1_ex() and SMIME_read_ASN1() return a valid \s-1ASN1_VALUE\s0 structure or \s-1NULL\s0 if an error occurred. The error can be obtained from \fBERR_get_error\|(3). Header "SEE ALSO" \fBERR_get_error\|(3), \fBSMIME_read_CMS_ex\|(3), \fBSMIME_read_PKCS7_ex\|(3), \fBSMIME_write_ASN1\|(3), \fBSMIME_write_ASN1_ex\|(3) Header "HISTORY" The function SMIME_read_ASN1_ex() was added in OpenSSL 3.0. Header "COPYRIGHT" Copyright 2020-2021 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>.