4 #include <linux/crypto.h>
6 #include <asm/scatterlist.h>
8 #define ESP_NUM_FAST_SG 4
12 struct scatterlist sgbuf[ESP_NUM_FAST_SG];
17 int key_len; /* Key length */
18 u8 *ivec; /* ivec buffer */
19 /* ivlen is offset from enc_data, where encrypted data start.
20 * It is logically different of crypto_tfm_alg_ivsize(tfm).
21 * We assume that it is either zero (no ivec), or
22 * >= crypto_tfm_alg_ivsize(tfm). */
24 int padlen; /* 0..255 */
25 struct crypto_blkcipher *tfm; /* crypto handle */
28 /* Integrity. It is active when icv_full_len != 0 */
31 int key_len; /* Length of the key */
35 void (*icv)(struct esp_data*,
37 int offset, int len, u8 *icv);
38 struct crypto_hash *tfm;
42 extern int skb_to_sgvec(struct sk_buff *skb, struct scatterlist *sg, int offset, int len);
43 extern int skb_cow_data(struct sk_buff *skb, int tailbits, struct sk_buff **trailer);
44 extern void *pskb_put(struct sk_buff *skb, struct sk_buff *tail, int len);
46 static inline int esp_mac_digest(struct esp_data *esp, struct sk_buff *skb,
49 struct hash_desc desc;
52 desc.tfm = esp->auth.tfm;
55 err = crypto_hash_init(&desc);
58 err = skb_icv_walk(skb, &desc, offset, len, crypto_hash_update);
61 return crypto_hash_final(&desc, esp->auth.work_icv);