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GM/T 0081-2020 (GMT0081-2020)

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BASIC DATA
Standard ID GM/T 0081-2020 (GM/T0081-2020)
Description (Translated English) SM9 cryptographic algorithm encryption and signature message syntax specification
Sector / Industry Chinese Industry Standard (Recommended)
Classification of Chinese Standard L80
Word Count Estimation 17,151
Date of Issue 2020-12-28
Date of Implementation 2021-07-01
Regulation (derived from) National Cryptography Administration Announcement No. 41
Issuing agency(ies) National Cryptography Administration

Standards related to: GM/T 0081-2020

GM/T 0081-2020
GM
CRYPTOGRAPHY INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 38.040
CCS L 80
SM9 Cryptographic Algorithm Encryption and
Signature Message Syntax Specification
ISSUED ON: DECEMBER 28, 2020
IMPLEMENTED ON: JULY 01, 2021
Issued by: State Cryptography Administration
Table of Contents
Foreword ... 4
1 Scope ... 5
2 Normative References ... 5
3 Terms and Definitions ... 5
4 Abbreviations ... 6
5 Definition of OID ... 7
6 Definition of Basic Type ... 7
6.1 IdentifierRevocationLists ... 7
6.2 ContentEncryptionAlgorithmIdentifier ... 7
6.3 DigestAlgorithmIdentifier ... 7
6.4 DigestEncryptionAlgorithmIdentifier ... 8
6.5 KeyEncryptionAlgorithmIdentifier ... 8
6.6 Version ... 8
6.7 ContentInfo ... 8
6.8 Identifier ... 8
6.9 Validity ... 10
6.10 IBCSysParamsPublishInfo ... 10
6.11 IDAppAttr ... 11
7 Data Type ... 12
8 Signed Data Type ... 12
8.1 SignedData type ... 12
8.2 SignerInfo type ... 13
9 Digital Enveloped Data Type ... 13
9.1 EnvelopedData type ... 13
9.2 ReceipientInfo type ... 15
10 Signed and Digital Enveloped Data Type (SignedAndEnvelopedData) ... 15
11 Encrypted Data Type (EncryptedData) ... 16
12 Key Agreement Type (KeyAgreementInfo) ... 17
Appendix A (Normative) Structure of Identifier Revocation List (IRL) ... 18
Bibliography ... 21
SM9 Cryptographic Algorithm Encryption and
Signature Message Syntax Specification
1 Scope
This Document defines the encryption and signature message syntax using the SM9
cryptographic algorithm.
This Document is applicable to the standardized encapsulation of operation results
when the SM9 algorithm is used for encryption and signature operations.
2 Normative References
The following documents are essential to the application of this Document. For the
dated documents, only the versions with the dates indicated are applicable to this
Document; for the undated documents, only the latest version (including all the
amendments) is applicable to this Document.
GB/T 33560 Information Security Technology - Cryptographic Application
Identifier Criterion Specification
GB/T 38635 (all parts) Information Security Technology - Identity-Based
Cryptographic Algorithms SM9
GM/T 0080 SM9 Cryptographic Algorithm Application Specification
GM/Z 4001-2013 Cryptographic Terms
3 Terms and Definitions
For the purposes of this Document, the terms given in GB/T 38635 (all parts) and GM/Z
4001-2013 and the following apply.
3.1 Algorithm identifier
Digitized information that is used to indicate algorithmic mechanisms.
3.2 SM9 algorithm
A cryptographic algorithm of national commercial bilinear pair elliptic curve public key.
3.3 Signature master key
The root signature key pair of the key management infrastructure, including the
signature master private key and signature master public key, which is used for digital
signature, signature verification and generating user signature key for the users.
3.4 Encryption master key
The root encryption key pair of the key management infrastructure, including the
encryption master private key and the encryption master public key, which is used for
digital encryption, decryption, and generating user encryption key for users.
3.5 Signature key
Thereof, the private key is generated by the key management infrastructure and
distributed to users. This type of key includes user signature private key and signature
public key, which are used for digital signature and signature verification.
3.6 Encryption key
Thereof, the private key is generated by the key management infrastructure and
distributed to users. This type of key includes user encryption private key and
encryption public key, which are used for encryption, decryption and key agreement.
3.7 Identity trust chain
A hierarchical ordered collection of identity application attribute information, in which
stores the identity application attribute information from the user terminal to the root
KGC.
4 Abbreviations
The following abbreviations are applicable to this Document.
IBC: Identity-Based Cryptography.
IRIs: Internationalized Resource Identifiers.
IRL: Identifier Revocation List.
KGC: Key Generation Centre.
OID: Object Identifier.
Where:
The version item (version) determines the version of the IBCSysParams format. The
format mentioned in this document shall be set to 2.
The name item (districtName) is an IA5 string that shall be encoded with URI or IRI.
districtSerial represents an integer that can be set by the only available IBC public
parameter (for URI or IRI defined by districtName). If a new parameter is announced
for districtName, the value of districtSerial shall be greater than the value of
districtSerial used before.
The validity period item (validity) determines the life of a specific IBCSysParams
example and is determined according to the following:
The values of notBefore and notAfter must be expressed in Greenwich Mean Time and
include seconds (for example, the time is expressed as YYYYMMDDHHMMSSZ).
Even if the number of seconds is zero, it must be expressed as the nearest number of
seconds. The customer must confirm that the date of the IBC public parameter it uses
is between the notBefore time and the notAfter time of the IBC public parameter. At the
same time, if the date is not in this interval, the parameter used for IBC encryption
operation cannot be used.
When the value of IbcPublicParameters, IbcIdentityType or IbcParamExtensions
changes an area, the IBC public parameters shall be regenerated and announced. The
customer shall retrieve the IBC public parameters within the application configuration
interval to ensure the version of the parameters is latest.
The IBCPublicParameters public parameter item is a structure that contains public
parameters (corresponding to the IBC algorithm formula supported by PKG). It is
defined as follows:
Where:
ibcAlgorithm OID determines the IBC algorithm formula. Two IBC algorithmic OIDs and
their publicParameterData structures.
publicParameterData is a DER encoding structure of SM9PublicParameterData, which
contains the real encrypted parameters. Its specific structure is as follows:
...