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Title "X509_NEW 3ossl" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
X509_new, X509_new_ex, X509_free, X509_up_ref, X509_chain_up_ref - X509 certificate ASN1 allocation functions Header "SYNOPSIS" .Vb 1 #include <openssl/x509.h> \& X509 *X509_new(void); X509 *X509_new_ex(OSSL_LIB_CTX *libctx, const char *propq); void X509_free(X509 *a); int X509_up_ref(X509 *a); STACK_OF(X509) *X509_chain_up_ref(STACK_OF(X509) *x); .Ve Header "DESCRIPTION" The X509 \s-1ASN1\s0 allocation routines, allocate and free an X509 structure, which represents an X509 certificate.

\fBX509_new_ex() allocates and initializes a X509 structure with a library context of libctx, property query of propq and a reference count of 1. Many X509 functions such as X509_check_purpose(), and \fBX509_verify() use this library context to select which providers supply the fetched algorithms (\s-1SHA1\s0 is used internally). This created X509 object can then be used when loading binary data using d2i_X509().

\fBX509_new() is similar to X509_new_ex() but sets the library context and property query to \s-1NULL.\s0 This results in the default (\s-1NULL\s0) library context being used for any X509 operations requiring algorithm fetches.

\fBX509_free() decrements the reference count of X509 structure a and frees it up if the reference count is zero. If a is \s-1NULL\s0 nothing is done.

\fBX509_up_ref() increments the reference count of a.

\fBX509_chain_up_ref() increases the reference count of all certificates in chain x and returns a copy of the stack, or an empty stack if a is \s-1NULL.\s0

Header "NOTES" The function X509_up_ref() if useful if a certificate structure is being used by several different operations each of which will free it up after use: this avoids the need to duplicate the entire certificate structure.

The function X509_chain_up_ref() doesn't just up the reference count of each certificate. It also returns a copy of the stack, using sk_X509_dup(), but it serves a similar purpose: the returned chain persists after the original has been freed.

Header "RETURN VALUES" If the allocation fails, X509_new() returns \s-1NULL\s0 and sets an error code that can be obtained by ERR_get_error\|(3). Otherwise it returns a pointer to the newly allocated structure.

\fBX509_up_ref() returns 1 for success and 0 for failure.

\fBX509_chain_up_ref() returns a copy of the stack or \s-1NULL\s0 if an error occurred.

Header "SEE ALSO" \fBd2i_X509\|(3), \fBERR_get_error\|(3), \fBX509_CRL_get0_by_serial\|(3), \fBX509_get0_signature\|(3), \fBX509_get_ext_d2i\|(3), \fBX509_get_extension_flags\|(3), \fBX509_get_pubkey\|(3), \fBX509_get_subject_name\|(3), \fBX509_get_version\|(3), \fBX509_NAME_add_entry_by_txt\|(3), \fBX509_NAME_ENTRY_get_object\|(3), \fBX509_NAME_get_index_by_NID\|(3), \fBX509_NAME_print_ex\|(3), \fBX509_sign\|(3), \fBX509V3_get_d2i\|(3), \fBX509_verify_cert\|(3) Header "HISTORY" The function X509_new_ex() was added in OpenSSL 3.0. Header "COPYRIGHT" Copyright 2002-2021 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>.