.\" $OpenBSD: X509_ALGOR_dup.3,v 1.5 2016/12/25 22:15:10 schwarze Exp $ .\" OpenSSL 4692340e Jun 7 15:49:08 2016 -0400 .\" .\" This file is a derived work. .\" The changes are covered by the following Copyright and license: .\" .\" Copyright (c) 2016 Ingo Schwarze .\" .\" Permission to use, copy, modify, and distribute this software for any .\" purpose with or without fee is hereby granted, provided that the above .\" copyright notice and this permission notice appear in all copies. .\" .\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES .\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF .\" MERCHANTABILITY AND FITNESS. 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IN NO EVENT SHALL THE OpenSSL PROJECT OR .\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, .\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT .\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; .\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, .\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED .\" OF THE POSSIBILITY OF SUCH DAMAGE. .\" .Dd $Mdocdate: December 25 2016 $ .Dt X509_ALGOR_DUP 3 .Os .Sh NAME .Nm X509_ALGOR_new , .Nm X509_ALGOR_free , .Nm X509_ALGOR_dup , .Nm X509_ALGOR_set0 , .Nm X509_ALGOR_get0 , .Nm X509_ALGOR_set_md , .Nm X509_ALGOR_cmp .Nd create, change, and inspect algorithm identifiers .Sh SYNOPSIS .In openssl/x509.h .Ft X509_ALGOR * .Fn X509_ALGOR_new void .Ft void .Fn X509_ALGOR_free "X509_ALGOR *alg" .Ft X509_ALGOR * .Fo X509_ALGOR_dup .Fa "X509_ALGOR *alg" .Fc .Ft int .Fo X509_ALGOR_set0 .Fa "X509_ALGOR *alg" .Fa "ASN1_OBJECT *aobj" .Fa "int ptype" .Fa "void *pval" .Fc .Ft void .Fo X509_ALGOR_get0 .Fa "ASN1_OBJECT **paobj" .Fa "int *pptype" .Fa "const void **ppval" .Fa "const X509_ALGOR *alg" .Fc .Ft void .Fo X509_ALGOR_set_md .Fa "X509_ALGOR *alg" .Fa "const EVP_MD *md" .Fc .Ft int .Fo X509_ALGOR_cmp .Fa "const X509_ALGOR *a" .Fa "const X509_ALGOR *b" .Fc .Sh DESCRIPTION .Fn X509_ALGOR_new allocates and initializes an empty .Vt X509_ALGOR object, representing an ASN.1 .Vt AlgorithmIdentifier structure defined in RFC 5280 section 4.1.1.2. Such objects can specify a cryptographic algorithm together with algorithm-specific parameters. They are used by many other objects, for example certificates, certificate revocation lists, and certificate requests. .Pp .Fn X509_ALGOR_free frees .Fa alg . .Pp .Fn X509_ALGOR_dup copies .Fa alg by calling .Xr i2d_X509_ALGOR 3 and .Xr d2i_X509_ALGOR 3 . .Pp .Fn X509_ALGOR_set0 sets the algorithm OID of .Fa alg to .Fa aobj and the associated parameter type to .Fa ptype with value .Fa pval . If .Fa ptype is .Dv V_ASN1_UNDEF the parameter is omitted, otherwise .Fa ptype and .Fa pval have the same meaning as the .Fa type and .Fa value parameters to .Xr ASN1_TYPE_set 3 . All the supplied parameters are used internally so must .Sy NOT be freed after this call. .Pp .Fn X509_ALGOR_get0 is the inverse of .Fn X509_ALGOR_set0 : it returns the algorithm OID in .Pf * Fa paobj and the associated parameter in .Pf * Fa pptype and .Pf * Fa ppval from .Fa alg . .Pp .Fn X509_ALGOR_set_md sets .Fa alg to appropriate values for the message digest .Fa md . .Pp .Fn X509_ALGOR_cmp compares .Fa a and .Fa b . .Sh RETURN VALUES .Fn X509_ALGOR_new and .Fn X509_ALGOR_dup return a new .Vt X509_ALGOR object or .Dv NULL if an error occurs. .Pp .Fn X509_ALGOR_set0 returns 1 for success or 0 for failure. .Pp .Fn X509_ALGOR_cmp returns 0 if .Fa a and .Fa b have identical encodings or non-zero otherwise. .Sh SEE ALSO .Xr ASN1_TYPE_set 3 , .Xr d2i_X509_ALGOR 3 , .Xr X509_PUBKEY_get0_param 3 .Sh STANDARDS RFC 5280: Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile