68 static int ccm_init_mac(struct aead_request *req, u8 maciv[], u32 msglen)  in ccm_init_mac()  argument
70 	struct crypto_aead *aead = crypto_aead_reqtfm(req);  in ccm_init_mac()
72 	u32 l = req->iv[0] + 1;  in ccm_init_mac()
89 	memcpy(maciv, req->iv, AES_BLOCK_SIZE - l);  in ccm_init_mac()
99 	if (req->assoclen)  in ccm_init_mac()
102 	memset(&req->iv[AES_BLOCK_SIZE - l], 0, l);  in ccm_init_mac()
106 static void ccm_calculate_auth_mac(struct aead_request *req, u8 mac[])  in ccm_calculate_auth_mac()  argument
108 	struct crypto_aead *aead = crypto_aead_reqtfm(req);  in ccm_calculate_auth_mac()
112 	u32 len = req->assoclen;  in ccm_calculate_auth_mac()
127 	scatterwalk_start(&walk, req->src);  in ccm_calculate_auth_mac()
148 static int ccm_encrypt(struct aead_request *req)  in ccm_encrypt()  argument
150 	struct crypto_aead *aead = crypto_aead_reqtfm(req);  in ccm_encrypt()
152 	struct blkcipher_desc desc = { .info = req->iv };  in ccm_encrypt()
160 	u32 len = req->cryptlen;  in ccm_encrypt()
163 	err = ccm_init_mac(req, mac, len);  in ccm_encrypt()
169 	if (req->assoclen)  in ccm_encrypt()
170 		ccm_calculate_auth_mac(req, mac);  in ccm_encrypt()
173 	memcpy(buf, req->iv, AES_BLOCK_SIZE);  in ccm_encrypt()
175 	src = scatterwalk_ffwd(srcbuf, req->src, req->assoclen);  in ccm_encrypt()
177 	if (req->src != req->dst)  in ccm_encrypt()
178 		dst = scatterwalk_ffwd(dstbuf, req->dst, req->assoclen);  in ccm_encrypt()
206 	scatterwalk_map_and_copy(mac, dst, req->cryptlen,  in ccm_encrypt()
212 static int ccm_decrypt(struct aead_request *req)  in ccm_decrypt()  argument
214 	struct crypto_aead *aead = crypto_aead_reqtfm(req);  in ccm_decrypt()
217 	struct blkcipher_desc desc = { .info = req->iv };  in ccm_decrypt()
225 	u32 len = req->cryptlen - authsize;  in ccm_decrypt()
228 	err = ccm_init_mac(req, mac, len);  in ccm_decrypt()
234 	if (req->assoclen)  in ccm_decrypt()
235 		ccm_calculate_auth_mac(req, mac);  in ccm_decrypt()
238 	memcpy(buf, req->iv, AES_BLOCK_SIZE);  in ccm_decrypt()
240 	src = scatterwalk_ffwd(srcbuf, req->src, req->assoclen);  in ccm_decrypt()
242 	if (req->src != req->dst)  in ccm_decrypt()
243 		dst = scatterwalk_ffwd(dstbuf, req->dst, req->assoclen);  in ccm_decrypt()
271 	scatterwalk_map_and_copy(buf, src, req->cryptlen - authsize,  in ccm_decrypt()