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Hakase
2019-09-21 00:43:47 +09:00
parent 2e57f602ae
commit 62515c7d8d
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doc/man3/EVP_MAC.pod
+177 -155
View File
@@ -2,11 +2,14 @@
=head1 NAME
EVP_MAC, EVP_MAC_CTX, EVP_MAC_CTX_new, EVP_MAC_CTX_new_id, EVP_MAC_CTX_free,
EVP_MAC_CTX_dup, EVP_MAC_CTX_mac, EVP_MAC_size, EVP_MAC_init, EVP_MAC_update,
EVP_MAC_final, EVP_MAC_ctrl, EVP_MAC_vctrl, EVP_MAC_ctrl_str,
EVP_MAC_str2ctrl, EVP_MAC_hex2ctrl, EVP_MAC_nid, EVP_MAC_name,
EVP_get_macbyname, EVP_get_macbynid, EVP_get_macbyobj - EVP MAC routines
EVP_MAC, EVP_MAC_fetch, EVP_MAC_up_ref, EVP_MAC_free,
EVP_MAC_is_a, EVP_MAC_name,
EVP_MAC_provider, EVP_MAC_get_params, EVP_MAC_gettable_params,
EVP_MAC_CTX, EVP_MAC_CTX_new, EVP_MAC_CTX_free, EVP_MAC_CTX_dup,
EVP_MAC_CTX_mac, EVP_MAC_CTX_get_params, EVP_MAC_CTX_set_params,
EVP_MAC_size, EVP_MAC_init, EVP_MAC_update, EVP_MAC_final,
EVP_MAC_CTX_gettable_params, EVP_MAC_CTX_settable_params,
EVP_MAC_do_all_ex - EVP MAC routines
=head1 SYNOPSIS
@@ -15,25 +18,35 @@ EVP_get_macbyname, EVP_get_macbynid, EVP_get_macbyobj - EVP MAC routines
typedef struct evp_mac_st EVP_MAC;
typedef struct evp_mac_ctx_st EVP_MAC_CTX;
EVP_MAC_CTX *EVP_MAC_CTX_new(const EVP_MAC *mac);
EVP_MAC_CTX *EVP_MAC_CTX_new_id(int nid);
EVP_MAC *EVP_MAC_fetch(OPENSSL_CTX *libctx, const char *algorithm,
const char *properties);
int EVP_MAC_up_ref(EVP_MAC *mac);
void EVP_MAC_free(EVP_MAC *mac);
int EVP_MAC_is_a(const EVP_MAC *mac, const char *name);
const char *EVP_MAC_name(const EVP_MAC *mac);
const OSSL_PROVIDER *EVP_MAC_provider(const EVP_MAC *mac);
int EVP_MAC_get_params(EVP_MAC *mac, OSSL_PARAM params[]);
EVP_MAC_CTX *EVP_MAC_CTX_new(EVP_MAC *mac);
void EVP_MAC_CTX_free(EVP_MAC_CTX *ctx);
EVP_MAC_CTX *EVP_MAC_CTX_dup(const EVP_MAC_CTX *src);
const EVP_MAC *EVP_MAC_CTX_mac(EVP_MAC_CTX *ctx);
EVP_MAC *EVP_MAC_CTX_mac(EVP_MAC_CTX *ctx);
int EVP_MAC_CTX_get_params(EVP_MAC_CTX *ctx, OSSL_PARAM params[]);
int EVP_MAC_CTX_set_params(EVP_MAC_CTX *ctx, const OSSL_PARAM params[]);
size_t EVP_MAC_size(EVP_MAC_CTX *ctx);
int EVP_MAC_init(EVP_MAC_CTX *ctx);
int EVP_MAC_update(EVP_MAC_CTX *ctx, const unsigned char *data, size_t datalen);
int EVP_MAC_final(EVP_MAC_CTX *ctx, unsigned char *out, size_t *poutlen);
int EVP_MAC_ctrl(EVP_MAC_CTX *ctx, int cmd, ...);
int EVP_MAC_vctrl(EVP_MAC_CTX *ctx, int cmd, va_list args);
int EVP_MAC_ctrl_str(EVP_MAC_CTX *ctx, const char *type, const char *value);
int EVP_MAC_str2ctrl(EVP_MAC_CTX *ctx, int cmd, const char *value);
int EVP_MAC_hex2ctrl(EVP_MAC_CTX *ctx, int cmd, const char *value);
int EVP_MAC_nid(const EVP_MAC *mac);
const char *EVP_MAC_name(const EVP_MAC *mac);
const EVP_MAC *EVP_get_macbyname(const char *name);
const EVP_MAC *EVP_get_macbynid(int nid);
const EVP_MAC *EVP_get_macbyobj(const ASN1_OBJECT *o);
int EVP_MAC_final(EVP_MAC_CTX *ctx,
unsigned char *out, size_t *outl, size_t outsize);
const OSSL_PARAM *EVP_MAC_gettable_params(const EVP_MAC *mac);
const OSSL_PARAM *EVP_MAC_CTX_gettable_params(const EVP_MAC *mac);
const OSSL_PARAM *EVP_MAC_CTX_settable_params(const EVP_MAC *mac);
void EVP_MAC_do_all_ex(OPENSSL_CTX *libctx,
void (*fn)(EVP_MAC *mac, void *arg),
void *arg);
=head1 DESCRIPTION
@@ -60,23 +73,36 @@ B<EVP_MAC_CTX> is a context type that holds internal MAC information
as well as a reference to a computation context, for those MACs that
rely on an underlying computation algorithm.
=head2 Algorithm implementation fetching
EVP_MAC_fetch() fetches an implementation of a MAC I<algorithm>, given
a library context I<libctx> and a set of I<properties>.
See L<provider(7)/Fetching algorithms> for further information.
The returned value must eventually be freed with
L<EVP_MAC_free(3)>.
EVP_MAC_up_ref() increments the reference count of an already fetched
MAC.
EVP_MAC_free() frees a fetched algorithm.
NULL is a valid parameter, for which this function is a no-op.
=head2 Context manipulation functions
EVP_MAC_CTX_new() creates a new context for the MAC type C<mac>.
EVP_MAC_CTX_new_id() creates a new context for the numerical MAC
identity <nid>.
EVP_MAC_CTX_new() creates a new context for the MAC type I<mac>.
The created context can then be used with most other functions
described here.
EVP_MAC_CTX_free() frees the contents of the context, including an
underlying context if there is one, as well as the context itself.
B<NULL> is a valid parameter, for which this function is a no-op.
NULL is a valid parameter, for which this function is a no-op.
EVP_MAC_CTX_dup() duplicates the C<src> context and returns a newly allocated
EVP_MAC_CTX_dup() duplicates the I<src> context and returns a newly allocated
context.
EVP_MAC_CTX_mac() returns the B<EVP_MAC> associated with the context
C<ctx>.
I<ctx>.
=head2 Computing functions
@@ -85,180 +111,180 @@ through diverse controls.
This should be called before calling EVP_MAC_update() and
EVP_MAC_final().
EVP_MAC_update() adds C<datalen> bytes from C<data> to the MAC input.
EVP_MAC_update() adds I<datalen> bytes from I<data> to the MAC input.
EVP_MAC_final() does the final computation and stores the result in
the memory pointed at by C<out>, and sets its size in the B<size_t>
the C<poutlen> points at.
If C<out> is B<NULL>, then no computation is made.
the memory pointed at by I<out> of size I<outsize>, and sets the number
of bytes written in I<*outl> at.
If I<out> is B<NULL> or I<outsize> is too small, then no computation
is made.
To figure out what the output length will be and allocate space for it
dynamically, simply call with C<out> being B<NULL> and C<poutlen>
dynamically, simply call with I<out> being B<NULL> and I<outl>
pointing at a valid location, then allocate space and make a second
call with C<out> pointing at the allocated space.
call with I<out> pointing at the allocated space.
EVP_MAC_ctrl() is used to manipulate or get information on aspects of
the MAC which may vary depending on the MAC algorithm or its
implementation.
This includes the MAC key, and for MACs that use other algorithms to
do their computation, this is also the way to tell it which one to
use.
This functions takes variable arguments, the exact expected arguments
depend on C<cmd>.
EVP_MAC_ctrl() can be called both before and after EVP_MAC_init(), but
the effect will depend on what control is being use.
See L</CONTROLS> below for a description of standard controls.
EVP_MAC_get_params() retrieves details about the implementation
I<mac>.
The set of parameters given with I<params> determine exactly what
parameters should be retrieved.
Note that a parameter that is unknown in the underlying context is
simply ignored.
EVP_MAC_vctrl() is the variant of EVP_MAC_ctrl() that takes a
C<va_list> argument instead of variadic arguments.
EVP_MAC_CTX_get_params() retrieves chosen parameters, given the
context I<ctx> and its underlying context.
The set of parameters given with I<params> determine exactly what
parameters should be retrieved.
Note that a parameter that is unknown in the underlying context is
simply ignored.
EVP_MAC_ctrl_str() is an alternative to EVP_MAC_ctrl() to control the
MAC implementation as E<lt> C<type>, C<value> E<gt> pairs.
The MAC implementation documentation should specify what control type
strings are accepted.
EVP_MAC_CTX_set_params() passes chosen parameters to the underlying
context, given a context I<ctx>.
The set of parameters given with I<params> determine exactly what
parameters are passed down.
Note that a parameter that is unknown in the underlying context is
simply ignored.
Also, what happens when a needed parameter isn't passed down is
defined by the implementation.
EVP_MAC_str2ctrl() and EVP_MAC_hex2ctrl() are helper functions to
control the MAC implementation with raw strings or with strings
containing hexadecimal numbers.
The latter are decoded into bitstrings that are sent on to
EVP_MAC_ctrl().
EVP_MAC_gettable_params(), EVP_MAC_CTX_gettable_params() and
EVP_MAC_CTX_settable_params() get a constant B<OSSL_PARAM> array that
decribes the retrievable and settable parameters, i.e. parameters that
can be used with EVP_MAC_get_params(), EVP_MAC_CTX_get_params()
and EVP_MAC_CTX_set_params(), respectively.
See L<OSSL_PARAM(3)> for the use of B<OSSL_PARAM> as parameter descriptor.
=head2 Information functions
EVP_MAC_size() returns the MAC output size for the given context.
EVP_MAC_nid() returns the numeric identity of the given MAC implementation.
EVP_MAC_name() returns the name of the given MAC implementation.
=head2 Object database functions
EVP_MAC_is_a() checks if the given I<mac> is an implementation of an
algorithm that's identifiable with I<name>.
EVP_get_macbyname() fetches a MAC implementation from the object
database by name.
EVP_MAC_provider() returns the provider that holds the implementation
of the given I<mac>.
EVP_get_macbynid() fetches a MAC implementation from the object
database by numeric identity.
EVP_MAC_do_all_ex() traverses all MAC implemented by all activated
providers in the given library context I<libctx>, and for each of the
implementations, calls the given function I<fn> with the implementation method
and the given I<arg> as argument.
EVP_get_macbyobj() fetches a MAC implementation from the object
database by ASN.1 OBJECT (i.e. an encoded OID).
=head1 PARAMETERS
=head1 CONTROLS
Parameters are identified by name as strings, and have an expected
data type and maximum size.
OpenSSL has a set of macros for parameter names it expects to see in
its own MAC implementations.
Here, we show all three, the OpenSSL macro for the parameter name, the
name in string form, and a type description.
The standard controls are:
The standard parameter names are:
=over 4
=item B<EVP_MAC_CTRL_SET_KEY>
=item B<OSSL_MAC_PARAM_KEY> ("key") <octet string>
This control expects two arguments: C<unsigned char *key>, C<size_t keylen>
These will set the MAC key from the given string of the given length.
The string may be any bitstring, and can contain NUL bytes.
Its value is the MAC key as an array of bytes.
For MACs that use an underlying computation algorithm, the algorithm
I<must> be set first, see B<EVP_MAC_CTRL_SET_ENGINE>,
B<EVP_MAC_CTRL_SET_MD> and B<EVP_MAC_CTRL_SET_CIPHER> below.
must be set first, see parameter names "algorithm" below.
=item B<EVP_MAC_CTRL_SET_IV>
=item B<OSSL_MAC_PARAM_IV> ("iv") <octet string>
This control expects two arguments: C<unsigned char *key>, C<size_t keylen>
Some MAC implementations require an IV, this parameter sets the IV.
Some MAC implementations require an IV, this control sets the IV.
=item B<EVP_MAC_CTRL_SET_CUSTOM>
This control expects two arguments: C<unsigned char *custom>, C<size_t customlen>
=item B<OSSL_MAC_PARAM_CUSTOM> ("custom") <octet string>
Some MAC implementations (KMAC, BLAKE2) accept a Customization String,
this control sets the Customization String. The default value is "".
this parameter sets the Customization String. The default value is the
empty string.
=item B<EVP_MAC_CTRL_SET_SALT>
This control expects two arguments: C<unsigned char *salt>, C<size_t saltlen>
=item B<OSSL_MAC_PARAM_SALT> ("salt") <octet string>
This option is used by BLAKE2 MAC.
=item B<EVP_MAC_CTRL_SET_XOF>
=item B<OSSL_MAC_PARAM_XOF> ("xof") <integer>
This control expects one argument: C<int xof>
It's a simple flag, the value 0 or 1 are expected.
This option is used by KMAC.
=item B<EVP_MAC_CTRL_SET_FLAGS>
This control expects one argument: C<unsigned long flags>
=item B<OSSL_MAC_PARAM_FLAGS> ("flags") <integer>
These will set the MAC flags to the given numbers.
Some MACs do not support this option.
=item B<EVP_MAC_CTRL_SET_ENGINE>
=item B<OSSL_MAC_PARAM_ENGINE> ("engine") <UTF8 string>
=item B<EVP_MAC_CTRL_SET_MD>
=item B<OSSL_MAC_PARAM_PROPERTIES> ("properties") <UTF8 string>
=item B<EVP_MAC_CTRL_SET_CIPHER>
=item B<OSSL_MAC_PARAM_DIGEST> ("digest") <UTF8 string>
For MAC implementations that use an underlying computation algorithm,
these controls set what the algorithm should be, and the engine that
implements the algorithm if needed.
=item B<OSSL_MAC_PARAM_CIPHER> ("cipher") <UTF8 string>
Note that not all algorithms may support all digests. HMAC does not support
variable output length digests such as SHAKE128 or SHAKE256.
For MAC implementations that use an underlying computation cipher or
digest, these parameters set what the algorithm should be, and the
engine that implements the algorithm or the properties to fetch it
by if needed.
B<EVP_MAC_CTRL_SET_ENGINE> takes one argument: C<ENGINE *>
The value is always the name of the intended engine, algorithm,
or the properties.
B<EVP_MAC_CTRL_SET_MD> takes one argument: C<EVP_MD *>
Note that not all algorithms may support all digests.
HMAC does not support variable output length digests such as SHAKE128
or SHAKE256.
B<EVP_MAC_CTRL_SET_CIPHER> takes one argument: C<EVP_CIPHER *>
=item B<EVP_MAC_CTRL_SET_SIZE>
=item B<OSSL_MAC_PARAM_SIZE> ("size") <unsigned integer>
For MAC implementations that support it, set the output size that
EVP_MAC_final() should produce.
The allowed sizes vary between MAC implementations.
The allowed sizes vary between MAC implementations, but must never exceed
what can be given with a B<size_t>.
=back
All these control should be used before the calls to any of
All these parameters should be used before the calls to any of
EVP_MAC_init(), EVP_MAC_update() and EVP_MAC_final() for a full
computation.
Anything else may give undefined results.
=head1 NOTES
EVP_get_macbynid(), EVP_get_macbyobj() and EVP_MAC_name() are
implemented as a macro.
=head1 RETURN VALUES
EVP_MAC_CTX_new(), EVP_MAC_CTX_new_id() and EVP_MAC_CTX_dup() return a pointer
to a newly created EVP_MAC_CTX, or NULL if allocation failed.
EVP_MAC_fetch() returns a pointer to a newly fetched EVP_MAC, or
NULL if allocation failed.
EVP_MAC_up_ref() returns 1 on success, 0 on error.
EVP_MAC_free() returns nothing at all.
EVP_MAC_name() returns the name of the MAC, or NULL if NULL was
passed.
EVP_MAC_is_a() returns 1 if the given method can be identified with
the given name, otherwise 0.
EVP_MAC_provider() returns a pointer to the provider for the MAC, or
NULL on error.
EVP_MAC_CTX_new() and EVP_MAC_CTX_dup() return a pointer to a newly
created EVP_MAC_CTX, or NULL if allocation failed.
EVP_MAC_CTX_free() returns nothing at all.
EVP_MAC_init(), EVP_MAC_update(), and EVP_MAC_final() return 1 on success, 0 on error.
EVP_MAC_CTX_get_params() and EVP_MAC_CTX_set_params() return 1 on
success, 0 on error.
EVP_MAC_ctrl(), EVP_MAC_ctrl_str(), EVP_MAC_str2ctrl() and
EVP_MAC_hex2ctrl() return 1 on success and 0 or a negative value on
error.
In particular, the value -2 indicates that the given control type
isn't supported by the MAC implementation.
EVP_MAC_init(), EVP_MAC_update(), and EVP_MAC_final() return 1 on success, 0
on error.
EVP_MAC_size() returns the expected output size, or 0 if it isn't
set.
If it isn't set, a call to EVP_MAC_init() should get it set.
EVP_MAC_nid() returns the numeric identity for the given C<mac>.
EVP_MAC_do_all_ex() returns nothing at all.
EVP_MAC_name() returns the name for the given C<mac>, if it has been
added to the object database.
EVP_add_mac() returns 1 if the given C<mac> was successfully added to
the object database, otherwise 0.
EVP_get_macbyname(), EVP_get_macbynid() and EVP_get_macbyobj() return
the request MAC implementation, if it exists in the object database,
otherwise B<NULL>.
=head1 EXAMPLE
=head1 EXAMPLES
#include <stdlib.h>
#include <stdio.h>
@@ -268,29 +294,12 @@ otherwise B<NULL>.
#include <openssl/evp.h>
#include <openssl/err.h>
int ctrl_ign_unsupported(EVP_MAC_CTX *ctx, int cmd, ...)
{
va_list args;
int rv;
va_start(args, cmd);
rv = EVP_MAC_vctrl(ctx, cmd, args);
va_end(args);
if (rv == -2)
rv = 1; /* Ignore unsupported, pretend it worked fine */
return rv;
}
#include <openssl/params.h>
int main() {
const EVP_MAC *mac =
EVP_get_macbyname(getenv("MY_MAC"));
const EVP_CIPHER *cipher =
EVP_get_cipherbyname(getenv("MY_MAC_CIPHER"));
const EVP_MD *digest =
EVP_get_digestbyname(getenv("MY_MAC_DIGEST"));
EVP_MAC *mac = EVP_MAC_fetch(NULL, getenv("MY_MAC"), NULL);
const char *cipher = getenv("MY_MAC_CIPHER");
const char *digest = getenv("MY_MAC_DIGEST");
const char *key = getenv("MY_KEY");
EVP_MAC_CTX *ctx = NULL;
@@ -300,14 +309,23 @@ otherwise B<NULL>.
size_t i;
OSSL_PARAM params[4];
size_t params_n = 0;
if (cipher != NULL)
params[params_n++] =
OSSL_PARAM_construct_utf8_string("cipher", cipher, 0, NULL);
if (digest != NULL)
params[params_n++] =
OSSL_PARAM_construct_utf8_string("digest", digest, 0, NULL);
params[params_n++] =
OSSL_PARAM_construct_octet_string("key", key, strlen(key), NULL);
params[params_n] = OSSL_PARAM_construct_end();
if (mac == NULL
|| key == NULL
|| (ctx = EVP_MAC_CTX_new(mac)) == NULL
|| (cipher != NULL
&& !ctrl_ign_unsupported(ctx, EVP_MAC_CTRL_SET_CIPHER, cipher))
|| (digest != NULL
&& !ctrl_ign_unsupported(ctx, EVP_MAC_CTRL_SET_MD, digest))
|| EVP_MAC_ctrl(ctx, EVP_MAC_CTRL_SET_KEY, key, strlen(key)) <= 0)
|| EVP_MAC_CTX_set_params(ctx, params) <= 0)
goto err;
if (!EVP_MAC_init(ctx))
@@ -327,10 +345,12 @@ otherwise B<NULL>.
printf("\n");
EVP_MAC_CTX_free(ctx);
EVP_MAC_free(mac);
exit(0);
err:
EVP_MAC_CTX_free(ctx);
EVP_MAC_free(mac);
fprintf(stderr, "Something went wrong\n");
ERR_print_errors_fp(stderr);
exit (1);
@@ -348,6 +368,8 @@ F<./foo>)
=head1 SEE ALSO
L<property(7)>
L<OSSL_PARAM(3)>,
L<EVP_MAC_BLAKE2(7)>,
L<EVP_MAC_CMAC(7)>,
L<EVP_MAC_GMAC(7)>,
@@ -358,11 +380,11 @@ L<EVP_MAC_POLY1305(7)>
=head1 HISTORY
These functions were added in OpenSSL 3.0.0.
These functions were added in OpenSSL 3.0.
=head1 COPYRIGHT
Copyright 2018 The OpenSSL Project Authors. All Rights Reserved.
Copyright 2018-2019 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the Apache License 2.0 (the "License"). You may not use
this file except in compliance with the License. You can obtain a copy