237 lines
7.8 KiB
Groff
Executable File
237 lines
7.8 KiB
Groff
Executable File
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.\" ========================================================================
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.\"
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.IX Title "EVP_KEYMGMT 3"
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.TH EVP_KEYMGMT 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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EVP_KEYMGMT,
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EVP_KEYMGMT_fetch,
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EVP_KEYMGMT_up_ref,
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EVP_KEYMGMT_free,
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EVP_KEYMGMT_provider,
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EVP_KEYMGMT_is_a,
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EVP_KEYMGMT_number,
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EVP_KEYMGMT_do_all_provided,
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EVP_KEYMGMT_names_do_all
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\&\- EVP key management routines
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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/evp.h>
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\&
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\& typedef struct evp_keymgmt_st EVP_KEYMGMT;
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\&
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\& EVP_KEYMGMT *EVP_KEYMGMT_fetch(OPENSSL_CTX *ctx, const char *algorithm,
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\& const char *properties);
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\& int EVP_KEYMGMT_up_ref(EVP_KEYMGMT *keymgmt);
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\& void EVP_KEYMGMT_free(EVP_KEYMGMT *keymgmt);
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\& const OSSL_PROVIDER *EVP_KEYMGMT_provider(const EVP_KEYMGMT *keymgmt);
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\& int EVP_KEYMGMT_is_a(const EVP_KEYMGMT *keymgmt, const char *name);
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\& int EVP_KEYMGMT_number(const EVP_KEYMGMT *keymgmt);
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\& void EVP_KEYMGMT_do_all_provided(OPENSSL_CTX *libctx,
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\& void (*fn)(EVP_KEYMGMT *keymgmt, void *arg),
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\& void *arg);
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\& void EVP_KEYMGMT_names_do_all(const EVP_KEYMGMT *keymgmt,
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\& void (*fn)(const char *name, void *data),
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\& void *data);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fB\s-1EVP_KEYMGMT\s0\fR is a method object that represents key management
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implementations for different cryptographic algorithms.
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This method object provides functionality to have providers import key
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material from the outside, as well as export key material to the
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outside.
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Most of the functionality can only be used internally and has no
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public interface, this object is simply passed into other functions
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when needed.
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.PP
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\&\fIEVP_KEYMGMT_fetch()\fR looks for an algorithm within the provider that
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has been loaded into the \fB\s-1OPENSSL_CTX\s0\fR given by \fIctx\fR, having the
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name given by \fIalgorithm\fR and the properties given by \fIproperties\fR.
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.PP
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\&\fIEVP_KEYMGMT_up_ref()\fR increments the reference count for the given
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\&\fB\s-1EVP_KEYMGMT\s0\fR \fIkeymgmt\fR.
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.PP
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\&\fIEVP_KEYMGMT_free()\fR decrements the reference count for the given
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\&\fB\s-1EVP_KEYMGMT\s0\fR \fIkeymgmt\fR, and when the count reaches zero, frees it.
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.PP
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\&\fIEVP_KEYMGMT_provider()\fR returns the provider that has this particular
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implementation.
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.PP
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\&\fIEVP_KEYMGMT_is_a()\fR checks if \fIkeymgmt\fR is an implementation of an
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algorithm that's identifiable with \fIname\fR.
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.PP
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\&\fIEVP_KEYMGMT_number()\fR returns the internal dynamic number assigned to
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the \fIkeymgmt\fR.
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.PP
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\&\fIEVP_KEYMGMT_names_do_all()\fR traverses all names for the \fIkeymgmt\fR, and
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calls \fIfn\fR with each name and \fIdata\fR.
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.PP
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\&\fIEVP_KEYMGMT_do_all_provided()\fR traverses all key keymgmt implementations by
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all activated providers in the library context \fIlibctx\fR, and for each
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of the implementations, calls \fIfn\fR with the implementation method and
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\&\fIdata\fR as arguments.
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.SH "NOTES"
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.IX Header "NOTES"
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\&\fIEVP_KEYMGMT_fetch()\fR may be called implicitly by other fetching
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functions, using the same library context and properties.
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Any other \s-1API\s0 that uses keys will typically do this.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIEVP_KEYMGMT_fetch()\fR returns a pointer to the key management
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implementation represented by an \s-1EVP_KEYMGMT\s0 object, or \s-1NULL\s0 on
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error.
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.PP
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\&\fIEVP_KEYMGMT_up_ref()\fR returns 1 on success, or 0 on error.
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.PP
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\&\fIEVP_KEYMGMT_free()\fR doesn't return any value.
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.PP
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\&\fIEVP_KEYMGMT_provider()\fR returns a pointer to a provider object, or \s-1NULL\s0
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on error.
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.PP
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\&\fIEVP_KEYMGMT_is_a()\fR returns 1 of \fIkeymgmt\fR was identifiable,
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otherwise 0.
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.PP
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\&\fIEVP_KEYMGMT_number()\fR returns an integer.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIEVP_MD_fetch\fR\|(3), \s-1\fIOPENSSL_CTX\s0\fR\|(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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The functions described here were added in OpenSSL 3.0.
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2019 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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