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Title "X509_PUBKEY_new 3"
way too many mistakes in technical documents.
.nh
\fBX509_PUBKEY_new_ex() allocates and initializes an X509_PUBKEY structure associated with the given \s-1OSSL_LIB_CTX\s0 in the libctx parameter. Any algorithm fetches associated with using the X509_PUBKEY object will use the property query string propq. See \*(L"\s-1ALGORITHM FETCHING\*(R"\s0 in crypto\|(7) for further information about algorithm fetching.
\fBX509_PUBKEY_new() is the same as X509_PUBKEY_new_ex() except that the default (\s-1NULL\s0) \s-1OSSL_LIB_CTX\s0 and a \s-1NULL\s0 property query string are used.
\fBX509_PUBKEY_dup() creates a duplicate copy of the X509_PUBKEY object specified by a.
\fBX509_PUBKEY_free() frees up X509_PUBKEY structure a. If a is \s-1NULL\s0 nothing is done.
\fBX509_PUBKEY_set() sets the public key in *x to the public key contained in the \s-1EVP_PKEY\s0 structure pkey. If *x is not \s-1NULL\s0 any existing public key structure will be freed.
\fBX509_PUBKEY_get0() returns the public key contained in key. The returned value is an internal pointer which \s-1MUST NOT\s0 be freed after use.
\fBX509_PUBKEY_get() is similar to X509_PUBKEY_get0() except the reference count on the returned key is incremented so it \s-1MUST\s0 be freed using \fBEVP_PKEY_free() after use.
\fBd2i_PUBKEY_ex() decodes an \s-1EVP_PKEY\s0 structure using SubjectPublicKeyInfo format. Some public key decoding implementations may use cryptographic algorithms. In this case the supplied library context libctx and property query string propq are used. \fBd2i_PUBKEY() does the same as d2i_PUBKEY_ex() except that the default library context and property query string are used.
\fBi2d_PUBKEY() encodes an \s-1EVP_PKEY\s0 structure using SubjectPublicKeyInfo format.
\fBd2i_PUBKEY_bio(), d2i_PUBKEY_fp(), i2d_PUBKEY_bio() and i2d_PUBKEY_fp() are similar to d2i_PUBKEY() and i2d_PUBKEY() except they decode or encode using a \fB\s-1BIO\s0 or \s-1FILE\s0 pointer.
\fBX509_PUBKEY_set0_param() sets the public key parameters of pub. The \s-1OID\s0 associated with the algorithm is set to aobj. The type of the algorithm parameters is set to type using the structure pval. The encoding of the public key itself is set to the penclen bytes contained in buffer penc. On success ownership of all the supplied parameters is passed to pub so they must not be freed after the call.
\fBX509_PUBKEY_get0_param() retrieves the public key parameters from pub, \fI*ppkalg is set to the associated \s-1OID\s0 and the encoding consists of \fI*ppklen bytes at *pk, *pa is set to the associated AlgorithmIdentifier for the public key. If the value of any of these parameters is not required it can be set to \s-1NULL.\s0 All of the retrieved pointers are internal and must not be freed after the call.
\fBX509_PUBKEY_eq() compares two X509_PUBKEY values.
In many cases applications will not call the X509_PUBKEY functions directly: they will instead call wrapper functions such as X509_get0_pubkey().
\fBX509_PUBKEY_free() does not return a value.
\fBX509_PUBKEY_get0() and X509_PUBKEY_get() return a pointer to an \s-1EVP_PKEY\s0 structure or \s-1NULL\s0 if an error occurs.
\fBX509_PUBKEY_set(), X509_PUBKEY_set0_param() and X509_PUBKEY_get0_param() return 1 for success and 0 if an error occurred.
\fBX509_PUBKEY_eq() returns 1 for equal, 0 for different, and < 0 on error.
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>.
Indexes created Thu Apr 30 00:23:01 UTC 2026