- struct aead_request *aead_req;
- int reqsize = sizeof(*aead_req) + crypto_aead_reqsize(tfm);
- u8 *__aad;
--
++ int i;
+
- aead_req = kzalloc(reqsize + CCM_AAD_LEN, GFP_ATOMIC);
- if (!aead_req)
- return -ENOMEM;
--
++ crypto_cipher_encrypt_one(tfm, b, b_0);
+
- __aad = (u8 *)aead_req + reqsize;
- memcpy(__aad, aad, CCM_AAD_LEN);
--
++ /* Extra Authenticate-only data (always two AES blocks) */
++ for (i = 0; i < AES_BLOCK_SIZE; i++)
++ aad[i] ^= b[i];
++ crypto_cipher_encrypt_one(tfm, b, aad);
+
- sg_init_table(sg, 3);
- sg_set_buf(&sg[0], &__aad[2], be16_to_cpup((__be16 *)__aad));
- sg_set_buf(&sg[1], data, data_len);
- sg_set_buf(&sg[2], mic, mic_len);
--
++ aad += AES_BLOCK_SIZE;
+
- aead_request_set_tfm(aead_req, tfm);
- aead_request_set_crypt(aead_req, sg, sg, data_len, b_0);
- aead_request_set_ad(aead_req, sg[0].length);
-+ int i;
-
-- crypto_aead_encrypt(aead_req);
-- kzfree(aead_req);
-+ crypto_cipher_encrypt_one(tfm, b, b_0);
-
-- return 0;
-+ /* Extra Authenticate-only data (always two AES blocks) */
-+ for (i = 0; i < AES_BLOCK_SIZE; i++)
-+ aad[i] ^= b[i];
-+ crypto_cipher_encrypt_one(tfm, b, aad);
-+
-+ aad += AES_BLOCK_SIZE;
-+
+ for (i = 0; i < AES_BLOCK_SIZE; i++)
+ aad[i] ^= b[i];
+ crypto_cipher_encrypt_one(tfm, a, aad);
-+
+
+- crypto_aead_encrypt(aead_req);
+- kzfree(aead_req);
+ /* Mask out bits from auth-only-b_0 */
+ b_0[0] &= 0x07;
-+
+
+- return 0;
+ /* S_0 is used to encrypt T (= MIC) */
+ b_0[14] = 0;
+ b_0[15] = 0;
+ crypto_cipher_encrypt_one(tfm, s_0, b_0);
-+}
-+
+ }
+
+-int ieee80211_aes_ccm_decrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad,
+- u8 *data, size_t data_len, u8 *mic,
+- size_t mic_len)
+
+void ieee80211_aes_ccm_encrypt(struct crypto_cipher *tfm, u8 *b_0, u8 *aad,
+ u8 *data, size_t data_len, u8 *mic,
+ size_t mic_len)
-+{
+ {
+- struct scatterlist sg[3];
+- struct aead_request *aead_req;
+- int reqsize = sizeof(*aead_req) + crypto_aead_reqsize(tfm);
+- u8 *__aad;
+- int err;
+ int i, j, last_len, num_blocks;
+ u8 b[AES_BLOCK_SIZE];
+ u8 s_0[AES_BLOCK_SIZE];
+ u8 e[AES_BLOCK_SIZE];
+ u8 *pos, *cpos;
-+
+
+- if (data_len == 0)
+- return -EINVAL;
+ num_blocks = DIV_ROUND_UP(data_len, AES_BLOCK_SIZE);
+ last_len = data_len % AES_BLOCK_SIZE;
+ aes_ccm_prepare(tfm, b_0, aad, s_0, b, b);
-+
+
+- aead_req = kzalloc(reqsize + CCM_AAD_LEN, GFP_ATOMIC);
+- if (!aead_req)
+- return -ENOMEM;
+ /* Process payload blocks */
+ pos = data;
+ cpos = data;
+ for (j = 1; j <= num_blocks; j++) {
+ int blen = (j == num_blocks && last_len) ?
+ last_len : AES_BLOCK_SIZE;
-+
+
+- __aad = (u8 *)aead_req + reqsize;
+- memcpy(__aad, aad, CCM_AAD_LEN);
+ /* Authentication followed by encryption */
+ for (i = 0; i < blen; i++)
+ b[i] ^= pos[i];
+ crypto_cipher_encrypt_one(tfm, b, b);
-+
+
+- sg_init_table(sg, 3);
+- sg_set_buf(&sg[0], &__aad[2], be16_to_cpup((__be16 *)__aad));
+- sg_set_buf(&sg[1], data, data_len);
+- sg_set_buf(&sg[2], mic, mic_len);
+ b_0[14] = (j >> 8) & 0xff;
+ b_0[15] = j & 0xff;
+ crypto_cipher_encrypt_one(tfm, e, b_0);
+ for (i = 0; i < blen; i++)
+ *cpos++ = *pos++ ^ e[i];
+ }
-+
-+ for (i = 0; i < mic_len; i++)
-+ mic[i] = b[i] ^ s_0[i];
- }
--int ieee80211_aes_ccm_decrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad,
-+int ieee80211_aes_ccm_decrypt(struct crypto_cipher *tfm, u8 *b_0, u8 *aad,
- u8 *data, size_t data_len, u8 *mic,
- size_t mic_len)
- {
-- struct scatterlist sg[3];
-- struct aead_request *aead_req;
-- int reqsize = sizeof(*aead_req) + crypto_aead_reqsize(tfm);
-- u8 *__aad;
-- int err;
--
-- if (data_len == 0)
-- return -EINVAL;
--
-- aead_req = kzalloc(reqsize + CCM_AAD_LEN, GFP_ATOMIC);
-- if (!aead_req)
-- return -ENOMEM;
--
-- __aad = (u8 *)aead_req + reqsize;
-- memcpy(__aad, aad, CCM_AAD_LEN);
--
-- sg_init_table(sg, 3);
-- sg_set_buf(&sg[0], &__aad[2], be16_to_cpup((__be16 *)__aad));
-- sg_set_buf(&sg[1], data, data_len);
-- sg_set_buf(&sg[2], mic, mic_len);
--
- aead_request_set_tfm(aead_req, tfm);
- aead_request_set_crypt(aead_req, sg, sg, data_len + mic_len, b_0);
- aead_request_set_ad(aead_req, sg[0].length);
++ for (i = 0; i < mic_len; i++)
++ mic[i] = b[i] ^ s_0[i];
++}
+
+- err = crypto_aead_decrypt(aead_req);
+- kzfree(aead_req);
++int ieee80211_aes_ccm_decrypt(struct crypto_cipher *tfm, u8 *b_0, u8 *aad,
++ u8 *data, size_t data_len, u8 *mic,
++ size_t mic_len)
++{
+ int i, j, last_len, num_blocks;
+ u8 *pos, *cpos;
+ u8 a[AES_BLOCK_SIZE];
+ u8 b[AES_BLOCK_SIZE];
+ u8 s_0[AES_BLOCK_SIZE];
-+
+
+- return err;
+ num_blocks = DIV_ROUND_UP(data_len, AES_BLOCK_SIZE);
+ last_len = data_len % AES_BLOCK_SIZE;
+ aes_ccm_prepare(tfm, b_0, aad, s_0, a, b);
+ if ((mic[i] ^ s_0[i]) != a[i])
+ return -1;
+ }
-
-- err = crypto_aead_decrypt(aead_req);
-- kzfree(aead_req);
--
-- return err;
++
+ return 0;
}
{
- struct crypto_aead *tfm;
- int err;
-+ struct crypto_cipher *tfm;
-
+-
- tfm = crypto_alloc_aead("ccm(aes)", 0, CRYPTO_ALG_ASYNC);
- if (IS_ERR(tfm))
- return tfm;
--
++ struct crypto_cipher *tfm;
+
- err = crypto_aead_setkey(tfm, key, key_len);
- if (err)
- goto free_aead;
projects / openwrt / staging / hauke.git / blobdiff