Online SM4 Encryption Tool
Tool Introduction:
Online SM4 encryption tool is a symmetric encryption tool based on the Chinese national standard SM4 algorithm. It supports encryption modes: ECB, CBC, CFB, OFB, CTR, GCM, and padding methods: PKCS#5, PKCS#7, Zeros, ISO10126, ANSI X.923, ISO/IEC 7816-4. Both plaintext and ciphertext support Hex and Base64 formats.
About SM4 Encryption Algorithm：
SM4 currently refers to SM4.0, a block cipher standard adopted by the Chinese government, released by the Chinese National Cryptography Administration on March 21, 2012. The relevant standard is "GM/T 0002-2012 SM4 Block Cipher Algorithm (formerly SMS4 Block Cipher Algorithm)". The SM4 encryption algorithm is a symmetric encryption algorithm with both block length and key length of 128bit, using 32 rounds of non-linear iteration for both encryption and key expansion algorithms.