3187791ed3
[skip ci] Reviewed-by: Matt Caswell <matt@openssl.org> (Merged from https://github.com/openssl/openssl/pull/7831)
79 lines
2.6 KiB
Text
79 lines
2.6 KiB
Text
=pod
|
|
|
|
=head1 NAME
|
|
|
|
SM2 - Chinese SM2 signature and encryption algorithm support
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
The B<SM2> algorithm was first defined by the Chinese national standard GM/T
|
|
0003-2012 and was later standardized by ISO as ISO/IEC 14888. B<SM2> is actually
|
|
an elliptic curve based algorithm. The current implementation in OpenSSL supports
|
|
both signature and encryption schemes via the EVP interface.
|
|
|
|
When doing the B<SM2> signature algorithm, it requires a distinguishing identifier
|
|
to form the message prefix which is hashed before the real message is hashed.
|
|
|
|
=head1 NOTES
|
|
|
|
B<SM2> signatures can be generated by using the 'DigestSign' series of APIs, for
|
|
instance, EVP_DigestSignInit(), EVP_DigestSignUpdate() and EVP_DigestSignFinal().
|
|
Ditto for the verification process by calling the 'DigestVerify' series of APIs.
|
|
|
|
There are several special steps that need to be done before computing an B<SM2>
|
|
signature.
|
|
|
|
The B<EVP_PKEY> structure will default to using ECDSA for signatures when it is
|
|
created. It should be set to B<EVP_PKEY_SM2> by calling:
|
|
|
|
EVP_PKEY_set_alias_type(pkey, EVP_PKEY_SM2);
|
|
|
|
Then an ID should be set by calling:
|
|
|
|
EVP_PKEY_CTX_set1_id(pctx, id, id_len);
|
|
|
|
When calling the EVP_DigestSignInit() or EVP_DigestVerifyInit() functions, a
|
|
pre-allocated B<EVP_PKEY_CTX> should be assigned to the B<EVP_MD_CTX>. This is
|
|
done by calling:
|
|
|
|
EVP_MD_CTX_set_pkey_ctx(mctx, pctx);
|
|
|
|
And normally there is no need to pass a B<pctx> parameter to EVP_DigestSignInit()
|
|
or EVP_DigestVerifyInit() in such a scenario.
|
|
|
|
=head1 EXAMPLE
|
|
|
|
This example demonstrates the calling sequence for using an B<EVP_PKEY> to verify
|
|
a message with the SM2 signature algorithm and the SM3 hash algorithm:
|
|
|
|
#include <openssl/evp.h>
|
|
|
|
/* obtain an EVP_PKEY using whatever methods... */
|
|
EVP_PKEY_set_alias_type(pkey, EVP_PKEY_SM2);
|
|
mctx = EVP_MD_CTX_new();
|
|
pctx = EVP_PKEY_CTX_new(pkey, NULL);
|
|
EVP_PKEY_CTX_set1_id(pctx, id, id_len);
|
|
EVP_MD_CTX_set_pkey_ctx(mctx, pctx);;
|
|
EVP_DigestVerifyInit(mctx, NULL, EVP_sm3(), NULL, pkey);
|
|
EVP_DigestVerifyUpdate(mctx, msg, msg_len);
|
|
EVP_DigestVerifyFinal(mctx, sig, sig_len)
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<EVP_PKEY_CTX_new(3)>,
|
|
L<EVP_PKEY_set_alias_type(3)>,
|
|
L<EVP_DigestSignInit(3)>,
|
|
L<EVP_DigestVerifyInit(3)>,
|
|
L<EVP_PKEY_CTX_set1_id(3)>,
|
|
L<EVP_MD_CTX_set_pkey_ctx(3)>
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright 2018 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
|
|
in the file LICENSE in the source distribution or at
|
|
L<https://www.openssl.org/source/license.html>.
|
|
|
|
=cut
|