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Document the new DigestSign provider functions

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As well as the newly added "one shot" functions, we also document a number
of the other other digestsign functions which were missing documentation in
provider-signature.pod.

Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/11261)
This commit is contained in:
Matt Caswell 2020-03-05 17:16:04 +00:00
parent 3965480c82
commit d62be1580b
1 changed files with 160 additions and 6 deletions
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166
doc/man7/provider-signature.pod
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@ -38,12 +38,40 @@ provider-signature - The signature library E<lt>-E<gt> provider functions
size_t *routlen, size_t routsize,
const unsigned char *sig, size_t siglen);
/* Digest Sign */
int OP_signature_digest_sign_init(void *ctx, const char *mdname,
const char *props, void *provkey);
int OP_signature_digest_sign_update(void *ctx, const unsigned char *data,
size_t datalen);
int OP_signature_digest_sign_final(void *ctx, unsigned char *sig,
size_t *siglen, size_t sigsize);
int OP_signature_digest_sign(void *ctx, unsigned char *sigret, size_t *siglen,
size_t sigsize, const unsigned char *tbs,
size_t tbslen);
/* Digest Verify */
int OP_signature_digest_verify_init(void *ctx, const char *mdname,
const char *props, void *provkey);
int OP_signature_digest_verify_update(void *ctx, const unsigned char *data,
size_t datalen);
int OP_signature_digest_verify_final(void *ctx, const unsigned char *sig,
size_t siglen);
int OP_signature_digest_verify(void *ctx, const unsigned char *sig,
size_t siglen, const unsigned char *tbs,
size_t tbslen);
/* Signature parameters */
int OP_signature_get_ctx_params(void *ctx, OSSL_PARAM params[]);
const OSSL_PARAM *OP_signature_gettable_ctx_params(void);
int OP_signature_set_ctx_params(void *ctx, const OSSL_PARAM params[]);
const OSSL_PARAM *OP_signature_settable_ctx_params(void);
/* MD parameters */
int OP_signature_get_ctx_md_params(void *ctx, OSSL_PARAM params[]);
const OSSL_PARAM * OP_signature_gettable_ctx_md_params(void *ctx);
int OP_signature_set_ctx_md_params(void *ctx, const OSSL_PARAM params[]);
const OSSL_PARAM * OP_signature_settable_ctx_md_params(void *ctx);
=head1 DESCRIPTION
This documentation is primarily aimed at provider authors. See L<provider(7)>
@ -88,18 +116,53 @@ macros in L<openssl-core_numbers.h(7)>, as follows:
OP_signature_verify_recover_init OSSL_FUNC_SIGNATURE_VERIFY_RECOVER_INIT
OP_signature_verify_recover OSSL_FUNC_SIGNATURE_VERIFY_RECOVER
OP_signature_digest_sign_init OSSL_FUNC_SIGNATURE_DIGEST_SIGN_INIT
OP_signature_digest_sign_update OSSL_FUNC_SIGNATURE_DIGEST_SIGN_UPDATE
OP_signature_digest_sign_final OSSL_FUNC_SIGNATURE_DIGEST_SIGN_FINAL
OP_signature_digest_sign OSSL_FUNC_SIGNATURE_DIGEST_SIGN
OP_signature_digest_verify_init OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_INIT
OP_signature_digest_verify_update OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_UPDATE
OP_signature_digest_verify_final OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_FINAL
OP_signature_digest_verify OSSL_FUNC_SIGNATURE_DIGEST_VERIFY
OP_signature_get_ctx_params OSSL_FUNC_SIGNATURE_GET_CTX_PARAMS
OP_signature_gettable_ctx_params OSSL_FUNC_SIGNATURE_GETTABLE_CTX_PARAMS
OP_signature_set_ctx_params OSSL_FUNC_SIGNATURE_SET_CTX_PARAMS
OP_signature_settable_ctx_params OSSL_FUNC_SIGNATURE_SETTABLE_CTX_PARAMS
OP_signature_get_ctx_md_params OSSL_FUNC_SIGNATURE_GET_CTX_MD_PARAMS
OP_signature_gettable_ctx_md_params OSSL_FUNC_SIGNATURE_GETTABLE_CTX_MD_PARAMS
OP_signature_set_ctx_md_params OSSL_FUNC_SIGNATURE_SET_CTX_MD_PARAMS
OP_signature_settable_ctx_md_params OSSL_FUNC_SIGNATURE_SETTABLE_CTX_MD_PARAMS
A signature algorithm implementation may not implement all of these functions.
In order to be a consistent set of functions a provider must implement
OP_signature_newctx and OP_signature_freectx.
It must also implement both of OP_signature_sign_init and OP_signature_sign,
or both of OP_signature_verify_init and OP_signature_verify, or both of
OP_signature_verify_recover_init and OP_signature_verify_recover.
All other functions are optional.
In order to be a consistent set of functions we must have at least a set of
context functions (OP_signature_newctx and OP_signature_freectx) as well as a
set of "signature" functions, i.e. at least one of:
=over 4
=item OP_signature_sign_init and OP_signature_sign
=item OP_signature_verify_init and OP_signature_verify
=item OP_signature_verify_recover_init and OP_signature_verify_init
=item OP_signature_digest_sign_init, OP_signature_digest_sign_update and OP_signature_digest_sign_final
=item OP_signature_digest_verify_init, OP_signature_digest_verify_update and OP_signature_digest_verify_final
=item OP_signature_digest_sign_init and OP_signature_digest_sign
=item OP_signature_digest_verify_init and OP_signature_digest_verify
=back
OP_signature_set_ctx_params and OP_signature_settable_ctx_params are optional,
but if one of them is present then the other one must also be present. The same
applies to OP_signature_get_ctx_params and OP_signature_gettable_ctx_params, as
well as the "md_params" functions. The OP_signature_dupctx function is optional.
A signature algorithm must also implement some mechanism for generating,
loading or importing keys via the key management (OSSL_OP_KEYMGMT) operation.
@ -176,6 +239,70 @@ The length of the recovered data should be written to I<*routlen>.
If I<rout> is NULL then the maximum size of the output buffer is written to
the I<routlen> parameter.
=head2 Digest Sign Functions
OP_signature_digeset_sign_init() initialises a context for signing given a
provider side signature context in the I<ctx> parameter, and a pointer to a
provider key object in the I<provkey> parameter. The key object should have been
previously generated, loaded or imported into the provider using the
key management (OSSL_OP_KEYMGMT) operation (see provider-keymgmt(7)>.
The name of the digest to be used will be in the I<mdname> parameter. There may
also be properties to be used in fetching the digest in the I<props> parameter,
although this may be ignored by providers.
OP_signature_digest_sign_update() provides data to be signed in the I<data>
parameter which should be of length I<datalen>. A previously initialised
signature context is passed in the I<ctx> parameter. This function may be called
multiple times to cummulatively add data to be signed.
OP_signature_digest_sign_final() finalises a signature operation previously
started through OP_signature_digest_sign_init() and
OP_signature_digest_sign_update() calls. Once finalised no more data will be
added through OP_signature_digest_sign_update(). A previously initialised
signature context is passed in the I<ctx> parameter. Unless I<sig> is NULL, the
signature should be written to the location pointed to by the I<sig> parameter
and it should not exceed I<sigsize> bytes in length. The length of the signature
should be written to I<*siglen>. If I<sig> is NULL then the maximum length of
the signature should be written to I<*siglen>.
OP_signature_digest_sign() implements a "one shot" digest sign operation
previously started through OP_signature_digeset_sign_init(). A previously
initialised signature context is passed in the I<ctx> parameter. The data to be
signed is in I<tbs> which should be I<tbslen> bytes long. Unless I<sig> is NULL,
the signature should be written to the location pointed to by the I<sig>
parameter and it should not exceed I<sigsize> bytes in length. The length of the
signature should be written to I<*siglen>. If I<sig> is NULL then the maximum
length of the signature should be written to I<*siglen>.
=head2 Digest Verify Functions
OP_signature_digeset_verify_init() initialises a context for verifying given a
provider side verification context in the I<ctx> parameter, and a pointer to a
provider key object in the I<provkey> parameter. The key object should have been
previously generated, loaded or imported into the provider using the
key management (OSSL_OP_KEYMGMT) operation (see provider-keymgmt(7)>.
The name of the digest to be used will be in the I<mdname> parameter. There may
also be properties to be used in fetching the digest in the I<props> parameter,
although this may be ignored by providers.
OP_signature_digest_verify_update() provides data to be verified in the I<data>
parameter which should be of length I<datalen>. A previously initialised
verification context is passed in the I<ctx> parameter. This function may be
called multiple times to cummulatively add data to be verified.
OP_signature_digest_verify_final() finalises a verification operation previously
started through OP_signature_digest_verify_init() and
OP_signature_digest_verify_update() calls. Once finalised no more data will be
added through OP_signature_digest_verify_update(). A previously initialised
verification context is passed in the I<ctx> parameter. The signature to be
verified is in I<sig> which is I<siglen> bytes long.
OP_signature_digest_verify() implements a "one shot" digest verify operation
previously started through OP_signature_digeset_verify_init(). A previously
initialised verification context is passed in the I<ctx> parameter. The data to be
verified is in I<tbs> which should be I<tbslen> bytes long. The signature to be
verified is in I<sig> which is I<siglen> bytes long.
=head2 Signature Parameters
See L<OSSL_PARAM(3)> for further details on the parameters structure used by
@ -214,11 +341,38 @@ i.e. parameters that can be used with OP_signature_get_ctx_params() and
OP_signature_set_ctx_params() respectively.
See L<OSSL_PARAM(3)> for the use of B<OSSL_PARAM> as parameter descriptor.
=head2 MD Parameters
See L<OSSL_PARAM(3)> for further details on the parameters structure used by
the OP_signature_get_md_ctx_params() and OP_signature_set_md_ctx_params()
functions.
OP_signature_get_md_ctx_params() gets digest parameters associated with the
given provider side digest signature context I<ctx> and stores them in I<params>.
OP_signature_set_ms_ctx_params() sets the digest parameters associated with the
given provider side digest signature context I<ctx> to I<params>.
Any parameter settings are additional to any that were previously set.
Parameters currently recognised by built-in signature algorithms are the same
as those for built-in digest algorithms. See
L<provider-digest(7)/Digest Parameters> for further information.
OP_signature_gettable_md_ctx_params() and OP_signature_settable_md_ctx_params()
get a constant B<OSSL_PARAM> array that describes the gettable and settable
digest parameters, i.e. parameters that can be used with
OP_signature_get_md_ctx_params() and OP_signature_set_md_ctx_params()
respectively. See L<OSSL_PARAM(3)> for the use of B<OSSL_PARAM> as parameter
descriptor.
=head1 RETURN VALUES
OP_signature_newctx() and OP_signature_dupctx() should return the newly created
provider side signature, or NULL on failure.
OP_signature_gettable_ctx_params(), OP_signature_settable_ctx_params(),
OP_signature_gettable_md_ctx_params() and OP_signature_settable_md_ctx_params(),
return the gettable or settable parameters in a constant B<OSSL_PARAM> array.
All other functions should return 1 for success or 0 on error.
=head1 SEE ALSO