openssl - 如何使用 OpenSSL 的 CMAC_xxx 函数计算 AES CMAC？

Question

有没有办法用OpenSSL/计算 AES CMAC libcrypto？

最好以利用 AES-NI（或任何其他硬件加速）的方式。

另请参阅使用 OpenSSL EVP_DigestSign* 生成 CMAC 密钥失败

Answer 1

如我的博客文章中所述，您可以使用CMAC_CTX_new、和from来计算 AES-128-CBC CMAC。这是一个例子：CMAC_InitCMAC_UpdateCMAC_Finallib crypto

#include <stdio.h>
#include <openssl/cmac.h>

void printBytes(unsigned char *buf, size_t len) {
  for(int i=0; i<len; i++) {
    printf("%02x ", buf[i]);
  }
  printf("\n");
}

int main(int argc, char *argv[])
{
  // https://tools.ietf.org/html/rfc4493

  // K, M and T from 
  // http://csrc.nist.gov/publications/nistpubs/800-38B/Updated_CMAC_Examples.pdf
  // D.1 AES-128

  // K: 2b7e1516 28aed2a6 abf71588 09cf4f3c
  unsigned char key[] = { 0x2b,0x7e,0x15,0x16, 
                          0x28,0xae,0xd2,0xa6,
                          0xab,0xf7,0x15,0x88,
                          0x09,0xcf,0x4f,0x3c};

  // M: 6bc1bee2 2e409f96 e93d7e11 7393172a Mlen: 128
  unsigned char message[] = { 0x6b,0xc1,0xbe,0xe2, 
                              0x2e,0x40,0x9f,0x96, 
                              0xe9,0x3d,0x7e,0x11, 
                              0x73,0x93,0x17,0x2a };

  unsigned char mact[16] = {0}; 
  size_t mactlen;

  CMAC_CTX *ctx = CMAC_CTX_new();
  CMAC_Init(ctx, key, 16, EVP_aes_128_cbc(), NULL);
  printf("message length = %lu bytes (%lu bits)\n",sizeof(message), sizeof(message)*8);

  CMAC_Update(ctx, message, sizeof(message));
  CMAC_Final(ctx, mact, &mactlen);

  printBytes(mact, mactlen);
  /* expected result T = 070a16b4 6b4d4144 f79bdd9d d04a287c */

  CMAC_CTX_free(ctx);
  return 0;
}