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GB/T 32907-2016 PDF English

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GB/T 32907-2016: Information security technology - SM4 block cipher algorithm
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GB/T 32907-2016115 Add to Cart Auto, 9 seconds. Information security technology - SM4 block cipher algorithm Valid

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GB/T 32907-2016: Information security technology - 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/GBT32907-2016
GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 35.040 L 80 Information security technology - SM4 block cipher algorithm ISSUED ON: AUGUST 29, 2016 IMPLEMENTED ON: MARCH 01, 2017 Issued by: General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of PRC.

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 F ... 6 6.1 Round function structure ... 6 6.2 Synthetic replacement T ... 6 7 Algorithm description ... 7 7.1 Encryption algorithm... 7 7.2 Decryption algorithm ... 8 7.3 Key expansion algorithm ... 8 Appendix A (Informative) Calculation example ... 10 A.1 Example 1 ... 10 A.2 Example 2 ... 12 Information security technology - SM4 block cipher algorithm

1 Scope

This standard specifies the algorithm structure and algorithm description of the SM4 block cipher algorithm; gives examples of operations. This standard applies to the realization, testing, application of block cipher algorithms in commercial cipher products.

2 Terms and definitions

The following terms and definitions apply to this document. 2.1 Block length The number of bits in an information packet. 2.2 Key length The number of bits in the key. 2.3 Key expansion algorithm The arithmetic unit that transforms the key into a round key. 2.4 Rounds The number of iterations of the round function. 2.5 Round key Also known as sub-key, which is the key used in each round of iterative block cipher and derived from the input key using a key arrangement algorithm. 2.6 Word A group (string) with a length of 32 bits. 2.7 S-box The S box is a fixed 8-bit input and 8-bit output replacement, denoted as Sbox(.).

3 Symbols and abbreviations

The following symbols and abbreviations apply to this document: ⊕: 32-bit XOR < < < i: 32-bit circular left shift i-bit : A set of binary sequences of bit length n

4 Algorithm structure

The SM4 cipher algorithm is a block algorithm. The block length of this algorithm is 128 bits; the key length is 128 bits. Both the encryption algorithm and the key expansion algorithm adopt a nonlinear iterative structure; the number of operation rounds is 32 rounds. The algorithm structure of data decryption and data encryption is the same, but the use order of the round key is reversed. The decryption round key is the reverse order of the encryption round key.

5 Key and key parameters

The key length is 128 bits, expressed as MK = (MK0, MK1, MK2, MK3), where MKi (i = 0, 1, 2, 3) is a word. The round key is expressed as (rk0, rk1, ..., rk31), where rki (i = 0, ..., 31) is a 32- bit word. The round key is generated by the key. FK = (FK0, FK1, FK2, FK3) is the system parameter, CK = (CK0, CK1, ..., CK31) is the fixed parameter, which is used for the key expansion algorithm, where Let cki,j be the jth byte of CKi (i = 0, 1, ..., 31; j = 0, 1, 2, 3), that is, CKi = (cki,0, cki,1, cki,2, cki,3)∈( )4, then cki,j = (4i + j) x 7(mod256). The specific value of the fixed parameter CKi (i = 0, 1, ..., 31) is: 00070E15, 1C232A31, 383F464D, 545B6269, 70777E85, 8C939AA1, A8AFB6BD, C4CBD2D9, E0E7EEF5, FC030A11, 181F262D, 343B4249, 50575E65, 6C737A81, 888F969D, A4ABB2B9, C0C7CED5, DCE3EAF1, F8FF060D, 141B2229, 30373E45, 4C535A61, 686F767D, 848B9299, A0A7AEB5, BCC3CAD1, D8DFE6ED, F4FB0209, 10171E25, 2C333A41, 484F565D, 646B7279. The decryption key is the same as the encryption key; the round key used for decryption is generated by the decryption key; the round key generation method is the same as that of the encryption process. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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