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@ -43,118 +43,122 @@ |
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- struct aead_request *aead_req;
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- int reqsize = sizeof(*aead_req) + crypto_aead_reqsize(tfm);
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- u8 *__aad;
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+ int i;
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-
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- aead_req = kzalloc(reqsize + CCM_AAD_LEN, GFP_ATOMIC);
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- if (!aead_req)
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- return -ENOMEM;
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+ crypto_cipher_encrypt_one(tfm, b, b_0);
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-
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- __aad = (u8 *)aead_req + reqsize;
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- memcpy(__aad, aad, CCM_AAD_LEN);
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+ /* Extra Authenticate-only data (always two AES blocks) */
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+ for (i = 0; i < AES_BLOCK_SIZE; i++)
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+ aad[i] ^= b[i];
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+ crypto_cipher_encrypt_one(tfm, b, aad);
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-
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- sg_init_table(sg, 3);
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- sg_set_buf(&sg[0], &__aad[2], be16_to_cpup((__be16 *)__aad));
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- sg_set_buf(&sg[1], data, data_len);
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- sg_set_buf(&sg[2], mic, mic_len);
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+ aad += AES_BLOCK_SIZE;
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-
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- aead_request_set_tfm(aead_req, tfm);
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- aead_request_set_crypt(aead_req, sg, sg, data_len, b_0);
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- aead_request_set_ad(aead_req, sg[0].length);
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+ for (i = 0; i < AES_BLOCK_SIZE; i++)
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+ aad[i] ^= b[i];
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+ crypto_cipher_encrypt_one(tfm, a, aad);
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+ int i;
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- crypto_aead_encrypt(aead_req);
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- kzfree(aead_req);
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+ /* Mask out bits from auth-only-b_0 */
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+ b_0[0] &= 0x07;
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+ crypto_cipher_encrypt_one(tfm, b, b_0);
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- return 0;
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+ /* Extra Authenticate-only data (always two AES blocks) */
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+ for (i = 0; i < AES_BLOCK_SIZE; i++)
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+ aad[i] ^= b[i];
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+ crypto_cipher_encrypt_one(tfm, b, aad);
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+
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+ aad += AES_BLOCK_SIZE;
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+
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+ for (i = 0; i < AES_BLOCK_SIZE; i++)
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+ aad[i] ^= b[i];
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+ crypto_cipher_encrypt_one(tfm, a, aad);
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+
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+ /* Mask out bits from auth-only-b_0 */
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+ b_0[0] &= 0x07;
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+
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+ /* S_0 is used to encrypt T (= MIC) */
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+ b_0[14] = 0;
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+ b_0[15] = 0;
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+ crypto_cipher_encrypt_one(tfm, s_0, b_0);
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}
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-int ieee80211_aes_ccm_decrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad,
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- u8 *data, size_t data_len, u8 *mic,
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- size_t mic_len)
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+}
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+
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+
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+void ieee80211_aes_ccm_encrypt(struct crypto_cipher *tfm, u8 *b_0, u8 *aad,
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+ u8 *data, size_t data_len, u8 *mic,
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+ size_t mic_len)
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{
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- struct scatterlist sg[3];
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- struct aead_request *aead_req;
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- int reqsize = sizeof(*aead_req) + crypto_aead_reqsize(tfm);
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- u8 *__aad;
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- int err;
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+{
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+ int i, j, last_len, num_blocks;
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+ u8 b[AES_BLOCK_SIZE];
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+ u8 s_0[AES_BLOCK_SIZE];
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+ u8 e[AES_BLOCK_SIZE];
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+ u8 *pos, *cpos;
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- if (data_len == 0)
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- return -EINVAL;
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+
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+ num_blocks = DIV_ROUND_UP(data_len, AES_BLOCK_SIZE);
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+ last_len = data_len % AES_BLOCK_SIZE;
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+ aes_ccm_prepare(tfm, b_0, aad, s_0, b, b);
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- aead_req = kzalloc(reqsize + CCM_AAD_LEN, GFP_ATOMIC);
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- if (!aead_req)
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- return -ENOMEM;
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+
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+ /* Process payload blocks */
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+ pos = data;
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+ cpos = data;
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+ for (j = 1; j <= num_blocks; j++) {
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+ int blen = (j == num_blocks && last_len) ?
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+ last_len : AES_BLOCK_SIZE;
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- __aad = (u8 *)aead_req + reqsize;
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- memcpy(__aad, aad, CCM_AAD_LEN);
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+
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+ /* Authentication followed by encryption */
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+ for (i = 0; i < blen; i++)
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+ b[i] ^= pos[i];
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+ crypto_cipher_encrypt_one(tfm, b, b);
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- sg_init_table(sg, 3);
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- sg_set_buf(&sg[0], &__aad[2], be16_to_cpup((__be16 *)__aad));
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- sg_set_buf(&sg[1], data, data_len);
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- sg_set_buf(&sg[2], mic, mic_len);
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+
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+ b_0[14] = (j >> 8) & 0xff;
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+ b_0[15] = j & 0xff;
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+ crypto_cipher_encrypt_one(tfm, e, b_0);
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+ for (i = 0; i < blen; i++)
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+ *cpos++ = *pos++ ^ e[i];
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+ }
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- aead_request_set_tfm(aead_req, tfm);
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- aead_request_set_crypt(aead_req, sg, sg, data_len + mic_len, b_0);
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- aead_request_set_ad(aead_req, sg[0].length);
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+
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+ for (i = 0; i < mic_len; i++)
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+ mic[i] = b[i] ^ s_0[i];
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+}
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}
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- err = crypto_aead_decrypt(aead_req);
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- kzfree(aead_req);
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-int ieee80211_aes_ccm_decrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad,
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+int ieee80211_aes_ccm_decrypt(struct crypto_cipher *tfm, u8 *b_0, u8 *aad,
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+ u8 *data, size_t data_len, u8 *mic,
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+ size_t mic_len)
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+{
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u8 *data, size_t data_len, u8 *mic,
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size_t mic_len)
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{
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- struct scatterlist sg[3];
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- struct aead_request *aead_req;
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- int reqsize = sizeof(*aead_req) + crypto_aead_reqsize(tfm);
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- u8 *__aad;
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- int err;
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-
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- if (data_len == 0)
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- return -EINVAL;
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-
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- aead_req = kzalloc(reqsize + CCM_AAD_LEN, GFP_ATOMIC);
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- if (!aead_req)
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- return -ENOMEM;
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-
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- __aad = (u8 *)aead_req + reqsize;
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- memcpy(__aad, aad, CCM_AAD_LEN);
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-
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- sg_init_table(sg, 3);
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- sg_set_buf(&sg[0], &__aad[2], be16_to_cpup((__be16 *)__aad));
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- sg_set_buf(&sg[1], data, data_len);
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- sg_set_buf(&sg[2], mic, mic_len);
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-
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- aead_request_set_tfm(aead_req, tfm);
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- aead_request_set_crypt(aead_req, sg, sg, data_len + mic_len, b_0);
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- aead_request_set_ad(aead_req, sg[0].length);
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+ int i, j, last_len, num_blocks;
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+ u8 *pos, *cpos;
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+ u8 a[AES_BLOCK_SIZE];
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+ u8 b[AES_BLOCK_SIZE];
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+ u8 s_0[AES_BLOCK_SIZE];
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- return err;
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+
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+ num_blocks = DIV_ROUND_UP(data_len, AES_BLOCK_SIZE);
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+ last_len = data_len % AES_BLOCK_SIZE;
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+ aes_ccm_prepare(tfm, b_0, aad, s_0, a, b);
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@ -181,7 +185,11 @@ |
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+ if ((mic[i] ^ s_0[i]) != a[i])
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+ return -1;
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+ }
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+
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- err = crypto_aead_decrypt(aead_req);
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- kzfree(aead_req);
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-
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- return err;
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+ return 0;
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}
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@ -194,12 +202,12 @@ |
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{
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- struct crypto_aead *tfm;
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- int err;
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-
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+ struct crypto_cipher *tfm;
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- tfm = crypto_alloc_aead("ccm(aes)", 0, CRYPTO_ALG_ASYNC);
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- if (IS_ERR(tfm))
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- return tfm;
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+ struct crypto_cipher *tfm;
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-
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- err = crypto_aead_setkey(tfm, key, key_len);
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- if (err)
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- goto free_aead;
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