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GM/T 0002-2012 PDF English

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GM/T 0002-2012: SM4 block cipher algorithm
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GM/T 0002-201270 Add to Cart Auto, 9 seconds. SM4 block cipher algorithm Valid

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GM/T 0002-2012: SM4 block cipher algorithm

---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GMT0002-2012
GM CRYPTOGRAPHIC INDUSTRY STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 35.040 L 80 Record no.. 36825-2012 SM4 block cipher algorithm Issued on: MARCH 21, 2012 Implemented on: MARCH 21, 2012 Issued by. State Cryptography Administration of the People’s Republic of China

Table of Contents

Foreword ... 3 1 Scope ... 4 2 Terms and definitions ... 4 3 Symbols and abbreviations ... 5 4 Algorithm structure ... 5 5 Key and key parameters ... 5 6 Round function ... 5 6.1 Structure of round function ... 5 6.2 Compound replacement T ... 6 7 Algorithm description ... 7 7.1 Encryption algorithm ... 7 7.2 Decryption algorithm ... 7 7.3 Key expansion algorithm ... 7 Annex A (Informative) Examples of operation ... 9 A.1 Example 1 ... 9 A.2 Example 2 ... 10 SM4 block cipher algorithm

1 Scope

This Standard specifies the algorithm structure and algorithm description of SM4 block cipher algorithm and gives examples for computation. This Standard applies to the requirements for the use of block cipher algorithm in cryptographic applications.

2 Terms and definitions

For the purposes of this document, the following terms and definitions apply. 2.1 block length Number of bits of an information block. 2.2 key length Number of bits of key. 2.3 key expansion algorithm Arithmetic unit in which a key is converted into a round key. 2.4 rounds Number of iterations of round function. 2.5 word Block (string) of 32-bit length. 2.6 S-box S-box is the fixed replacement of 8-bit input with 8-bit output, expressed as Sbox(.).

3 Symbols and abbreviations

32-bit exclusive-OR operation Left shift of 32-bit words by i bits

4 Algorithm structure

SM4 cipher algorithm is a block algorithm. The block length of the algorithm is 128 bits; the key length is 128 bits. Both encryption algorithm and key expansion algorithm are of a 32-round nonlinear iteration structure. Data decryption and data encryption are of the same algorithm structure, but the use orders of round keys are opposite. A decryption round key is the reverse order of an encryption round key.

5 Key and key parameters

The length of an encryption key is 128 bits, expressed as MK = (MK0, MK1, MK2, MK3), where MKi (i = 0, 1, 2, 3) is a word. Round keys are expressed as (rk0, Fk1, FK2, FK3), where rki (i = 0, ..., 31) is a 32-bit word. Round keys are generated by encryption keys. FK = (FK0, FK1, FK2, FK3), a system parameter, and CK = (CK0, CK1, ..., CK31), a fixed parameter, are used for key expansion algorithm, where FKi (i =0, ..., 3) and CKi (i = 0, ..., 31) are words.

6 Round function

6.1 Structure of round function Let the input be and the round key , then the round function F is. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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