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Title "EVP_PKEY-SM2 7" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
EVP_PKEY-SM2, EVP_KEYMGMT-SM2, SM2 \- EVP_PKEY keytype support for the Chinese SM2 signature and encryption algorithms Header "DESCRIPTION" The \s-1SM2\s0 algorithm was first defined by the Chinese national standard \s-1GM/T 0003-2012\s0 and was later standardized by \s-1ISO\s0 as \s-1ISO/IEC 14888.\s0 \s-1SM2\s0 is actually an elliptic curve based algorithm. The current implementation in OpenSSL supports both signature and encryption schemes via the \s-1EVP\s0 interface.

When doing the \s-1SM2\s0 signature algorithm, it requires a distinguishing identifier to form the message prefix which is hashed before the real message is hashed.

Subsection "Common SM2 parameters" \s-1SM2\s0 uses the parameters defined in \*(L"Common \s-1EC\s0 parameters\*(R" in \s-1EVP_PKEY-EC\s0\|(7). The following parameters are different: Item "cofactor (OSSL_PKEY_PARAM_EC_COFACTOR) <unsigned integer>" This parameter is ignored for \s-1SM2\s0. Item "(OSSL_PKEY_PARAM_DEFAULT_DIGEST) <UTF8 string>" Getter that returns the default digest name. (Currently returns \*(L"\s-1SM3\*(R"\s0 as of OpenSSL 3.0). Header "NOTES" \fB\s-1SM2\s0 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.

Before computing an \s-1SM2\s0 signature, an \s-1EVP_PKEY_CTX\s0 needs to be created, and an \s-1SM2\s0 \s-1ID\s0 must be set for it, like this:

.Vb 1 EVP_PKEY_CTX_set1_id(pctx, id, id_len); .Ve

Before calling the EVP_DigestSignInit() or EVP_DigestVerifyInit() functions, that \s-1EVP_PKEY_CTX\s0 should be assigned to the \s-1EVP_MD_CTX\s0, like this:

.Vb 1 EVP_MD_CTX_set_pkey_ctx(mctx, pctx); .Ve

There is normally no need to pass a pctx parameter to EVP_DigestSignInit() or EVP_DigestVerifyInit() in such a scenario.

\s-1SM2\s0 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, \s-1SM2\s0 keys can be generated and loaded only when the domain parameters specify the \s-1SM2\s0 elliptic curve.

Header "EXAMPLES" This example demonstrates the calling sequence for using an \s-1EVP_PKEY\s0 to verify a message with the \s-1SM2\s0 signature algorithm and the \s-1SM3\s0 hash algorithm:

.Vb 1 #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) .Ve

Header "SEE ALSO" \fBEVP_PKEY_CTX_new\|(3), \fBEVP_DigestSignInit\|(3), \fBEVP_DigestVerifyInit\|(3), \fBEVP_PKEY_CTX_set1_id\|(3), \fBEVP_MD_CTX_set_pkey_ctx\|(3) Header "COPYRIGHT" Copyright 2018-2021 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.