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Title "SM2 7" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
SM2 - Chinese SM2 signature and encryption algorithm support 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.

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.

There are several special steps that need to be done before computing an \s-1SM2\s0 signature.

The \s-1EVP_PKEY\s0 structure will default to using \s-1ECDSA\s0 for signatures when it is created. It should be set to \s-1EVP_PKEY_SM2\s0 by calling:

.Vb 1 EVP_PKEY_set_alias_type(pkey, EVP_PKEY_SM2); .Ve

Then an \s-1ID\s0 should be set by calling:

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

When calling the EVP_DigestSignInit() or EVP_DigestVerifyInit() functions, a preallocated \s-1EVP_PKEY_CTX\s0 should be assigned to the \s-1EVP_MD_CTX\s0. This is done by calling:

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

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

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... */ 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) .Ve

Header "SEE ALSO" \fBEVP_PKEY_CTX_new\|(3), \fBEVP_PKEY_set_alias_type\|(3), \fBEVP_DigestSignInit\|(3), \fBEVP_DigestVerifyInit\|(3), \fBEVP_PKEY_CTX_set1_id\|(3), \fBEVP_MD_CTX_set_pkey_ctx\|(3) Header "COPYRIGHT" Copyright 2018-2020 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the OpenSSL license (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>.