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PPP, MPPE, using our SHA1 instead of Linux crypto sha1

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This commit is contained in:
Sylvain Rochet 2015-03-27 00:45:01 +01:00
parent 0b7e3610ac
commit cfd930cae7
1 changed files with 17 additions and 42 deletions
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59
src/netif/ppp/mppe.c
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@ -30,6 +30,14 @@
#include "netif/ppp/mppe.h"
#include "netif/ppp/pppdebug.h"
#if LWIP_INCLUDED_POLARSSL_SHA1
#include "netif/ppp/polarssl/sha1.h"
#else
#include "polarssl/sha1.h"
#endif
#define SHA1_SIGNATURE_SIZE 20
static unsigned int
setup_sg(struct scatterlist *sg, const void *address, unsigned int length)
{
@ -61,8 +69,7 @@ static inline void sha_pad_init(struct sha_pad *shapad)
*/
struct ppp_mppe_state {
struct crypto_blkcipher *arc4;
struct crypto_hash *sha1;
unsigned char *sha1_digest;
u8_t sha1_digest[SHA1_SIGNATURE_SIZE];
unsigned char master_key[MPPE_MAX_KEY_LEN];
unsigned char session_key[MPPE_MAX_KEY_LEN];
unsigned keylen; /* key length in bytes */
@ -101,23 +108,14 @@ struct ppp_mppe_state {
*/
static void get_new_key_from_sha(struct ppp_mppe_state * state)
{
struct hash_desc desc;
struct scatterlist sg[4];
unsigned int nbytes;
sha1_context sha1;
sg_init_table(sg, 4);
nbytes = setup_sg(&sg[0], state->master_key, state->keylen);
nbytes += setup_sg(&sg[1], sha_pad->sha_pad1,
sizeof(sha_pad->sha_pad1));
nbytes += setup_sg(&sg[2], state->session_key, state->keylen);
nbytes += setup_sg(&sg[3], sha_pad->sha_pad2,
sizeof(sha_pad->sha_pad2));
desc.tfm = state->sha1;
desc.flags = 0;
crypto_hash_digest(&desc, sg, nbytes, state->sha1_digest);
sha1_starts(&sha1);
sha1_update(&sha1, state->master_key, state->master_key);
sha1_update(&sha1, sha_pad->sha_pad1, sizeof(sha_pad->sha_pad1));
sha1_update(&sha1, state->session_key, state->keylen);
sha1_update(&sha1, sha_pad->sha_pad2, sizeof(sha_pad->sha_pad2));
sha1_finish(&sha1, state->sha1_digest);
}
/*
@ -176,20 +174,6 @@ static void *mppe_alloc(unsigned char *options, int optlen)
goto out_free;
}
state->sha1 = crypto_alloc_hash("sha1", 0, CRYPTO_ALG_ASYNC);
if (IS_ERR(state->sha1)) {
state->sha1 = NULL;
goto out_free;
}
digestsize = crypto_hash_digestsize(state->sha1);
if (digestsize < MPPE_MAX_KEY_LEN)
goto out_free;
state->sha1_digest = kmalloc(digestsize, GFP_KERNEL);
if (!state->sha1_digest)
goto out_free;
/* Save keys. */
memcpy(state->master_key, &options[CILEN_MPPE],
sizeof(state->master_key));
@ -204,10 +188,6 @@ static void *mppe_alloc(unsigned char *options, int optlen)
return (void *)state;
out_free:
if (state->sha1_digest)
kfree(state->sha1_digest);
if (state->sha1)
crypto_free_hash(state->sha1);
if (state->arc4)
crypto_free_blkcipher(state->arc4);
kfree(state);
@ -222,10 +202,6 @@ static void mppe_free(void *arg)
{
struct ppp_mppe_state *state = (struct ppp_mppe_state *) arg;
if (state) {
if (state->sha1_digest)
kfree(state->sha1_digest);
if (state->sha1)
crypto_free_hash(state->sha1);
if (state->arc4)
crypto_free_blkcipher(state->arc4);
kfree(state);
@ -677,8 +653,7 @@ static struct compressor ppp_mppe = {
static int ppp_mppe_init(void)
{
int answer;
if (!(crypto_has_blkcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC) &&
crypto_has_hash("sha1", 0, CRYPTO_ALG_ASYNC)))
if (!(crypto_has_blkcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC)))
return -ENODEV;
sha_pad = kmalloc(sizeof(struct sha_pad), GFP_KERNEL);