EVP_SM4_CBC(3)             Library Functions Manual             EVP_SM4_CBC(3)

NAME
     EVP_sm4_cbc, EVP_sm4_ecb, EVP_sm4_cfb, EVP_sm4_cfb128, EVP_sm4_ofb,
     EVP_sm4_ctr - EVP SM4 cipher

SYNOPSIS
     #include <openssl/evp.h>

     const EVP_CIPHER *
     EVP_sm4_cbc(void);

     const EVP_CIPHER *
     EVP_sm4_ecb(void);

     const EVP_CIPHER *
     EVP_sm4_cfb(void);

     const EVP_CIPHER *
     EVP_sm4_cfb128(void);

     const EVP_CIPHER *
     EVP_sm4_ofb(void);

     const EVP_CIPHER *
     EVP_sm4_ctr(void);

DESCRIPTION
     These functions provide the SM4 blockcipher in the evp(3) framework.

     All modes use a key length of 128 bits and act on blocks of 128 bits.

     EVP_sm4_cfb() is an alias for EVP_sm4_cfb128(), implemented as a macro.

     With an argument of "sm4" or "SM4", EVP_get_cipherbyname(3) returns
     EVP_sm4_cbc().

RETURN VALUES
     These functions return an EVP_CIPHER structure that provides the
     implementation of the symmetric cipher.

SEE ALSO
     evp(3), EVP_EncryptInit(3)

STANDARDS
     Information security technology - SM4 block cipher algorithm, National
     Standards of People's Republic of China, GB/T 32907-2016, August 29,
     2016.

HISTORY
     These functions appeared in OpenSSL 1.1.1 and have been available since
     OpenBSD 6.5.

Linux 6.8.7-arch1-1            November 16, 2023           Linux 6.8.7-arch1-1