demos/evp/aesccm.c

   1 /* Simple AES CCM test program, uses the same NIST data used for the FIPS
   2  * self test but uses the application level EVP APIs.
   3  */
   4 #include <stdio.h>
   5 #include <openssl/bio.h>
   6 #include <openssl/evp.h>
   7
   8 /* AES-CCM test data from NIST public test vectors */
   9
  10 static const unsigned char ccm_key[] = {
  11         0xce,0xb0,0x09,0xae,0xa4,0x45,0x44,0x51,0xfe,0xad,0xf0,0xe6,
  12         0xb3,0x6f,0x45,0x55,0x5d,0xd0,0x47,0x23,0xba,0xa4,0x48,0xe8
  13 };
  14
  15 static const unsigned char ccm_nonce[] = {
  16         0x76,0x40,0x43,0xc4,0x94,0x60,0xb7
  17 };
  18
  19 static const unsigned char ccm_adata[] = {
  20         0x6e,0x80,0xdd,0x7f,0x1b,0xad,0xf3,0xa1,0xc9,0xab,0x25,0xc7,
  21         0x5f,0x10,0xbd,0xe7,0x8c,0x23,0xfa,0x0e,0xb8,0xf9,0xaa,0xa5,
  22         0x3a,0xde,0xfb,0xf4,0xcb,0xf7,0x8f,0xe4
  23 };
  24
  25 static const unsigned char ccm_pt[] = {
  26         0xc8,0xd2,0x75,0xf9,0x19,0xe1,0x7d,0x7f,0xe6,0x9c,0x2a,0x1f,
  27         0x58,0x93,0x9d,0xfe,0x4d,0x40,0x37,0x91,0xb5,0xdf,0x13,0x10
  28 };
  29
  30 static const unsigned char ccm_ct[] = {
  31         0x8a,0x0f,0x3d,0x82,0x29,0xe4,0x8e,0x74,0x87,0xfd,0x95,0xa2,
  32         0x8a,0xd3,0x92,0xc8,0x0b,0x36,0x81,0xd4,0xfb,0xc7,0xbb,0xfd
  33 };
  34
  35 static const unsigned char ccm_tag[] = {
  36         0x2d,0xd6,0xef,0x1c,0x45,0xd4,0xcc,0xb7,0x23,0xdc,0x07,0x44,
  37         0x14,0xdb,0x50,0x6d
  38 };
  39
  40 void aes_ccm_encrypt(void)
  41         {
  42         EVP_CIPHER_CTX *ctx;
  43         int outlen, tmplen;
  44         unsigned char outbuf[1024];
  45         printf("AES CCM Encrypt:\n");
  46         printf("Plaintext:\n");
  47         BIO_dump_fp(stdout, ccm_pt, sizeof(ccm_pt));
  48         ctx = EVP_CIPHER_CTX_new();
  49         /* Set cipher type and mode */
  50         EVP_EncryptInit_ex(ctx, EVP_aes_192_ccm(), NULL, NULL, NULL);
  51         /* Set nonce length if default 96 bits is not appropriate */
  52         EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_CCM_SET_IVLEN, sizeof(ccm_nonce), NULL);
  53         /* Set tag length */
  54         EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_CCM_SET_TAG, sizeof(ccm_tag), NULL);
  55         /* Initialise key and IV */
  56         EVP_EncryptInit_ex(ctx, NULL, NULL, ccm_key, ccm_nonce);
  57         /* Set plaintext length: only needed if AAD is used */
  58         EVP_EncryptUpdate(ctx, NULL, &outlen, NULL, sizeof(ccm_pt));
  59         /* Zero or one call to specify any AAD */
  60         EVP_EncryptUpdate(ctx, NULL, &outlen, ccm_adata, sizeof(ccm_adata));
  61         /* Encrypt plaintext: can only be called once */
  62         EVP_EncryptUpdate(ctx, outbuf, &outlen, ccm_pt, sizeof(ccm_pt));
  63         /* Output encrypted block */
  64         printf("Ciphertext:\n");
  65         BIO_dump_fp(stdout, outbuf, outlen);
  66         /* Finalise: note get no output for CCM */
  67         EVP_EncryptFinal_ex(ctx, outbuf, &outlen);
  68         /* Get tag */
  69         EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_CCM_GET_TAG, 16, outbuf);
  70         /* Output tag */
  71         printf("Tag:\n");
  72         BIO_dump_fp(stdout, outbuf, 16);
  73         EVP_CIPHER_CTX_free(ctx);
  74         }
  75
  76 void aes_ccm_decrypt(void)
  77         {
  78         EVP_CIPHER_CTX *ctx;
  79         int outlen, tmplen, rv;
  80         unsigned char outbuf[1024];
  81         printf("AES CCM Derypt:\n");
  82         printf("Ciphertext:\n");
  83         BIO_dump_fp(stdout, ccm_ct, sizeof(ccm_ct));
  84         ctx = EVP_CIPHER_CTX_new();
  85         /* Select cipher */
  86         EVP_DecryptInit_ex(ctx, EVP_aes_192_ccm(), NULL, NULL, NULL);
  87         /* Set nonce length, omit for 96 bits */
  88         EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_CCM_SET_IVLEN, sizeof(ccm_nonce), NULL);
  89         /* Set expected tag value */
  90         EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_CCM_SET_TAG,
  91                                         sizeof(ccm_tag), (void *)ccm_tag);
  92         /* Specify key and IV */
  93         EVP_DecryptInit_ex(ctx, NULL, NULL, ccm_key, ccm_nonce);
  94         /* Set ciphertext length: only needed if we have AAD */
  95         EVP_DecryptUpdate(ctx, NULL, &outlen, NULL, sizeof(ccm_ct));
  96         /* Zero or one call to specify any AAD */
  97         EVP_DecryptUpdate(ctx, NULL, &outlen, ccm_adata, sizeof(ccm_adata));
  98         /* Decrypt plaintext, verify tag: can only be called once */
  99         rv = EVP_DecryptUpdate(ctx, outbuf, &outlen, ccm_ct, sizeof(ccm_ct));
 100         /* Output decrypted block: if tag verify failed we get nothing */
 101         if (rv > 0)
 102                 {
 103                 printf("Plaintext:\n");
 104                 BIO_dump_fp(stdout, outbuf, outlen);
 105                 }
 106         else
 107                 printf("Plaintext not available: tag verify failed.\n");
 108         EVP_CIPHER_CTX_free(ctx);
 109         }
 110
 111 int main(int argc, char **argv)
 112         {
 113         aes_ccm_encrypt();
 114         aes_ccm_decrypt();
 115         }