2  * Counter with CBC-MAC (CCM) with AES
13 #include "aes.h"
28 static void aes_ccm_auth_start(void *aes, size_t M, size_t L, const u8 *nonce,  in aes_ccm_auth_start()  argument
44 	aes_encrypt(aes, b, x); /* X_1 = E(K, B_0) */  in aes_ccm_auth_start()
54 	aes_encrypt(aes, aad_buf, x); /* X_2 = E(K, X_1 XOR B_1) */  in aes_ccm_auth_start()
59 		aes_encrypt(aes, &aad_buf[AES_BLOCK_SIZE], x);  in aes_ccm_auth_start()
64 static void aes_ccm_auth(void *aes, const u8 *data, size_t len, u8 *x)  in aes_ccm_auth()  argument
73 		aes_encrypt(aes, x, x);  in aes_ccm_auth()
79 		aes_encrypt(aes, x, x);  in aes_ccm_auth()
92 static void aes_ccm_encr(void *aes, size_t L, const u8 *in, size_t len, u8 *out,  in aes_ccm_encr()  argument
102 		aes_encrypt(aes, a, out);  in aes_ccm_encr()
109 		aes_encrypt(aes, a, out);  in aes_ccm_encr()
117 static void aes_ccm_encr_auth(void *aes, size_t M, u8 *x, u8 *a, u8 *auth)  in aes_ccm_encr_auth()  argument
125 	aes_encrypt(aes, a, tmp);  in aes_ccm_encr_auth()
132 static void aes_ccm_decr_auth(void *aes, size_t M, u8 *a, const u8 *auth, u8 *t)  in aes_ccm_decr_auth()  argument
140 	aes_encrypt(aes, a, tmp);  in aes_ccm_decr_auth()
147 /* AES-CCM with fixed L=2 and aad_len <= 30 assumption */
153 	void *aes;  in aes_ccm_ae()  local
159 	aes = aes_encrypt_init(key, key_len);  in aes_ccm_ae()
160 	if (aes == NULL)  in aes_ccm_ae()
163 	aes_ccm_auth_start(aes, M, L, nonce, aad, aad_len, plain_len, x);  in aes_ccm_ae()
164 	aes_ccm_auth(aes, plain, plain_len, x);  in aes_ccm_ae()
168 	aes_ccm_encr(aes, L, plain, plain_len, crypt, a);  in aes_ccm_ae()
169 	aes_ccm_encr_auth(aes, M, x, a, auth);  in aes_ccm_ae()
171 	aes_encrypt_deinit(aes);  in aes_ccm_ae()
177 /* AES-CCM with fixed L=2 and aad_len <= 30 assumption */
183 	void *aes;  in aes_ccm_ad()  local
190 	aes = aes_encrypt_init(key, key_len);  in aes_ccm_ad()
191 	if (aes == NULL)  in aes_ccm_ad()
196 	aes_ccm_decr_auth(aes, M, a, auth, t);  in aes_ccm_ad()
199 	aes_ccm_encr(aes, L, crypt, crypt_len, plain, a);  in aes_ccm_ad()
201 	aes_ccm_auth_start(aes, M, L, nonce, aad, aad_len, crypt_len, x);  in aes_ccm_ad()
202 	aes_ccm_auth(aes, plain, crypt_len, x);  in aes_ccm_ad()
204 	aes_encrypt_deinit(aes);  in aes_ccm_ad()