EVP_PKEY-SM2(7) | OpenSSL | EVP_PKEY-SM2(7) |
When doing the SM2 signature algorithm, it requires a distinguishing identifier to form the message prefix which is hashed before the real message is hashed.
Before computing an SM2 signature, an EVP_PKEY_CTX needs to be created, and an SM2 ID must be set for it, like this:
EVP_PKEY_CTX_set1_id(pctx, id, id_len);
Before calling the EVP_DigestSignInit() or EVP_DigestVerifyInit() functions, that EVP_PKEY_CTX should be assigned to the EVP_MD_CTX, like this:
EVP_MD_CTX_set_pkey_ctx(mctx, pctx);
There is normally no need to pass a pctx parameter to EVP_DigestSignInit() or EVP_DigestVerifyInit() in such a scenario.
SM2 can be tested with the openssl-speed(1) application since version 3.0. Currently, the only valid algorithm name is sm2.
Since version 3.0, SM2 keys can be generated and loaded only when the domain parameters specify the SM2 elliptic curve.
#include <openssl/evp.h> /* obtain an EVP_PKEY using whatever methods... */ 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)
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 <https://www.openssl.org/source/license.html>.
2023-05-07 | 3.0.12 |