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SM2.7ssl
.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \*(-- will .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left .\" double quote, and \*(R" will give a right double quote. \*(C+ will .\" give a nicer C++. Capital omega is used to do unbreakable dashes and .\" therefore won't be available. \*(C` and \*(C' expand to `' in nroff, .\" nothing in troff, for use with C<>. .tr \(*W- .ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p' .ie n \{\ . ds -- \(*W- . ds PI pi . if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch . if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch . ds L" "" . ds R" "" . ds C` "" . ds C' "" 'br\} .el\{\ . ds -- \|\(em\| . ds PI \(*p . ds L" `` . ds R" '' . ds C` . ds C' 'br\} .\" .\" Escape single quotes in literal strings from groff's Unicode transform. .ie \n(.g .ds Aq \(aq .el .ds Aq ' .\" .\" If the F register is >0, we'll generate index entries on stderr for .\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index .\" entries marked with X<> in POD. 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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" SM2 \- Chinese SM2 signature and encryption algorithm support .SH "DESCRIPTION" .IX Header "DESCRIPTION" The \fB\s-1SM2\s0\fR 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 \fB\s-1SM2\s0\fR is actually an elliptic curve based algorithm. The current implementation in OpenSSL supports both signature and encryption schemes via the \s-1EVP\s0 interface. .PP When doing the \fB\s-1SM2\s0\fR signature algorithm, it requires a distinguishing identifier to form the message prefix which is hashed before the real message is hashed. .SH "NOTES" .IX Header "NOTES" \&\fB\s-1SM2\s0\fR signatures can be generated by using the 'DigestSign' series of APIs, for instance, \fBEVP_DigestSignInit()\fR, \fBEVP_DigestSignUpdate()\fR and \fBEVP_DigestSignFinal()\fR. Ditto for the verification process by calling the 'DigestVerify' series of APIs. .PP There are several special steps that need to be done before computing an \fB\s-1SM2\s0\fR signature. .PP The \fB\s-1EVP_PKEY\s0\fR structure will default to using \s-1ECDSA\s0 for signatures when it is created. It should be set to \fB\s-1EVP_PKEY_SM2\s0\fR by calling: .PP .Vb 1 \& EVP_PKEY_set_alias_type(pkey, EVP_PKEY_SM2); .Ve .PP Then an \s-1ID\s0 should be set by calling: .PP .Vb 1 \& EVP_PKEY_CTX_set1_id(pctx, id, id_len); .Ve .PP When calling the \fBEVP_DigestSignInit()\fR or \fBEVP_DigestVerifyInit()\fR functions, a preallocated \fB\s-1EVP_PKEY_CTX\s0\fR should be assigned to the \fB\s-1EVP_MD_CTX\s0\fR. This is done by calling: .PP .Vb 1 \& EVP_MD_CTX_set_pkey_ctx(mctx, pctx); .Ve .PP And normally there is no need to pass a \fBpctx\fR parameter to \fBEVP_DigestSignInit()\fR or \fBEVP_DigestVerifyInit()\fR in such a scenario. .SH "EXAMPLES" .IX Header "EXAMPLES" This example demonstrates the calling sequence for using an \fB\s-1EVP_PKEY\s0\fR to verify a message with the \s-1SM2\s0 signature algorithm and the \s-1SM3\s0 hash algorithm: .PP .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 .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBEVP_PKEY_CTX_new\fR\|(3), \&\fBEVP_PKEY_set_alias_type\fR\|(3), \&\fBEVP_DigestSignInit\fR\|(3), \&\fBEVP_DigestVerifyInit\fR\|(3), \&\fBEVP_PKEY_CTX_set1_id\fR\|(3), \&\fBEVP_MD_CTX_set_pkey_ctx\fR\|(3) .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2018\-2020 The OpenSSL Project Authors. All Rights Reserved. .PP 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>.
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