245 lines
8.8 KiB
Groff
Executable File
245 lines
8.8 KiB
Groff
Executable File
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.\" ========================================================================
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.\"
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.IX Title "X509_PUBKEY_NEW 3"
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.TH X509_PUBKEY_NEW 3 "2020-03-02" "3.0.0-dev" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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X509_PUBKEY_new, X509_PUBKEY_free, X509_PUBKEY_dup,
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X509_PUBKEY_set, X509_PUBKEY_get0, X509_PUBKEY_get,
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d2i_PUBKEY, i2d_PUBKEY, d2i_PUBKEY_bio, d2i_PUBKEY_fp,
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i2d_PUBKEY_fp, i2d_PUBKEY_bio, X509_PUBKEY_set0_param,
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X509_PUBKEY_get0_param \- SubjectPublicKeyInfo public key functions
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/x509.h>
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\&
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\& X509_PUBKEY *X509_PUBKEY_new(void);
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\& void X509_PUBKEY_free(X509_PUBKEY *a);
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\& X509_PUBKEY *X509_PUBKEY_dup(const X509_PUBKEY *a);
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\&
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\& int X509_PUBKEY_set(X509_PUBKEY **x, EVP_PKEY *pkey);
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\& EVP_PKEY *X509_PUBKEY_get0(X509_PUBKEY *key);
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\& EVP_PKEY *X509_PUBKEY_get(X509_PUBKEY *key);
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\&
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\& EVP_PKEY *d2i_PUBKEY(EVP_PKEY **a, const unsigned char **pp, long length);
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\& int i2d_PUBKEY(const EVP_PKEY *a, unsigned char **pp);
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\&
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\& EVP_PKEY *d2i_PUBKEY_bio(BIO *bp, EVP_PKEY **a);
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\& EVP_PKEY *d2i_PUBKEY_fp(FILE *fp, EVP_PKEY **a);
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\&
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\& int i2d_PUBKEY_fp(const FILE *fp, EVP_PKEY *pkey);
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\& int i2d_PUBKEY_bio(BIO *bp, const EVP_PKEY *pkey);
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\&
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\& int X509_PUBKEY_set0_param(X509_PUBKEY *pub, ASN1_OBJECT *aobj,
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\& int ptype, void *pval,
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\& unsigned char *penc, int penclen);
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\& int X509_PUBKEY_get0_param(ASN1_OBJECT **ppkalg,
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\& const unsigned char **pk, int *ppklen,
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\& X509_ALGOR **pa, X509_PUBKEY *pub);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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The \fBX509_PUBKEY\fR structure represents the \s-1ASN\s0.1 \fBSubjectPublicKeyInfo\fR
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structure defined in \s-1RFC5280\s0 and used in certificates and certificate requests.
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.PP
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\&\fIX509_PUBKEY_new()\fR allocates and initializes an \fBX509_PUBKEY\fR structure.
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.PP
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\&\fIX509_PUBKEY_free()\fR frees up \fBX509_PUBKEY\fR structure \fBa\fR. If \fBa\fR is \s-1NULL\s0
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nothing is done.
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.PP
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\&\fIX509_PUBKEY_set()\fR sets the public key in \fB*x\fR to the public key contained
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in the \fB\s-1EVP_PKEY\s0\fR structure \fBpkey\fR. If \fB*x\fR is not \s-1NULL\s0 any existing
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public key structure will be freed.
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.PP
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\&\fIX509_PUBKEY_get0()\fR returns the public key contained in \fBkey\fR. The returned
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value is an internal pointer which \fB\s-1MUST\s0 \s-1NOT\s0\fR be freed after use.
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.PP
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\&\fIX509_PUBKEY_get()\fR is similar to \fIX509_PUBKEY_get0()\fR except the reference
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count on the returned key is incremented so it \fB\s-1MUST\s0\fR be freed using
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\&\fIEVP_PKEY_free()\fR after use.
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.PP
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\&\fId2i_PUBKEY()\fR and \fIi2d_PUBKEY()\fR decode and encode an \fB\s-1EVP_PKEY\s0\fR structure
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using \fBSubjectPublicKeyInfo\fR format. They otherwise follow the conventions of
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other \s-1ASN\s0.1 functions such as \fId2i_X509()\fR.
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.PP
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\&\fId2i_PUBKEY_bio()\fR, \fId2i_PUBKEY_fp()\fR, \fIi2d_PUBKEY_bio()\fR and \fIi2d_PUBKEY_fp()\fR are
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similar to \fId2i_PUBKEY()\fR and \fIi2d_PUBKEY()\fR except they decode or encode using a
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\&\fB\s-1BIO\s0\fR or \fB\s-1FILE\s0\fR pointer.
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.PP
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\&\fIX509_PUBKEY_set0_param()\fR sets the public key parameters of \fBpub\fR. The
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\&\s-1OID\s0 associated with the algorithm is set to \fBaobj\fR. The type of the
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algorithm parameters is set to \fBtype\fR using the structure \fBpval\fR.
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The encoding of the public key itself is set to the \fBpenclen\fR
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bytes contained in buffer \fBpenc\fR. On success ownership of all the supplied
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parameters is passed to \fBpub\fR so they must not be freed after the
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call.
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.PP
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\&\fIX509_PUBKEY_get0_param()\fR retrieves the public key parameters from \fBpub\fR,
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\&\fB*ppkalg\fR is set to the associated \s-1OID\s0 and the encoding consists of
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\&\fB*ppklen\fR bytes at \fB*pk\fR, \fB*pa\fR is set to the associated
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AlgorithmIdentifier for the public key. If the value of any of these
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parameters is not required it can be set to \fB\s-1NULL\s0\fR. All of the
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retrieved pointers are internal and must not be freed after the
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call.
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.SH "NOTES"
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.IX Header "NOTES"
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The \fBX509_PUBKEY\fR functions can be used to encode and decode public keys
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in a standard format.
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.PP
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In many cases applications will not call the \fBX509_PUBKEY\fR functions
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directly: they will instead call wrapper functions such as \fIX509_get0_pubkey()\fR.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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If the allocation fails, \fIX509_PUBKEY_new()\fR returns \fB\s-1NULL\s0\fR and sets an error
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code that can be obtained by \fIERR_get_error\fR\|(3).
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.PP
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Otherwise it returns a pointer to the newly allocated structure.
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.PP
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\&\fIX509_PUBKEY_free()\fR does not return a value.
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.PP
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\&\fIX509_PUBKEY_get0()\fR and \fIX509_PUBKEY_get()\fR return a pointer to an \fB\s-1EVP_PKEY\s0\fR
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structure or \fB\s-1NULL\s0\fR if an error occurs.
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.PP
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\&\fIX509_PUBKEY_set()\fR, \fIX509_PUBKEY_set0_param()\fR and \fIX509_PUBKEY_get0_param()\fR
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return 1 for success and 0 if an error occurred.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fId2i_X509\fR\|(3),
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\&\fIERR_get_error\fR\|(3),
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\&\fIX509_get_pubkey\fR\|(3),
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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