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.\" 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++. 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No user-serviceable parts. . \" fudge factors for nroff and troff .if n \{\ . ds #H 0 . ds #V .8m . ds #F .3m . ds #[ \f1 . ds #] \fP .\} .if t \{\ . ds #H ((1u-(\\\\n(.fu%2u))*.13m) . ds #V .6m . ds #F 0 . ds #[ \& . ds #] \& .\} . \" simple accents for nroff and troff .if n \{\ . ds ' \& . ds ` \& . ds ^ \& . ds , \& . ds ~ ~ . ds / .\} .if t \{\ . ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u" . ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u' . ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u' . ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u' . ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u' . ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u' .\} . \" troff and (daisy-wheel) nroff accents .ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V' .ds 8 \h'\*(#H'\(*b\h'-\*(#H' .ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#] .ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H' .ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u' .ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#] .ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#] .ds ae a\h'-(\w'a'u*4/10)'e .ds Ae A\h'-(\w'A'u*4/10)'E . \" corrections for vroff .if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u' .if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u' . \" for low resolution devices (crt and lpr) .if \n(.H>23 .if \n(.V>19 \ \{\ . ds : e . ds 8 ss . ds o a . ds d- d\h'-1'\(ga . ds D- D\h'-1'\(hy . ds th \o'bp' . ds Th \o'LP' . ds ae ae . ds Ae AE .\} .rm #[ #] #H #V #F C .\" ======================================================================== .\" .IX Title "SM2 7" .TH SM2 7 "2023-09-11" "1.1.1w" "OpenSSL" .\" For nroff, turn off justification. 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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