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fixed ikev1 iv derivation

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This commit is contained in:
Andreas Steffen 2009-05-14 20:25:38 +02:00
parent 7cdb1ddf08
commit 7121eca633
1 changed files with 30 additions and 8 deletions
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38
src/pluto/crypto.c
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@ -544,18 +544,40 @@ static void do_3des(u_int8_t *buf, size_t buf_len, u_int8_t *key,
(des_cblock *)iv, enc);
}
/* hash and prf routines */
void crypto_cbc_encrypt(const struct encrypt_desc *e, bool enc, u_int8_t *buf,
size_t size, struct state *st)
{
passert(st->st_new_iv_len >= e->enc_blocksize);
st->st_new_iv_len = e->enc_blocksize; /* truncate */
chunk_t data = { buf, size };
chunk_t iv;
char *new_iv;
size_t crypter_block_size;
encryption_algorithm_t enc_alg;
crypter_t *crypter;
e->do_crypt(buf, size, st->st_enc_key.ptr, st->st_enc_key.len, st->st_new_iv, enc);
/*
e->set_key(&ctx, st->st_enc_key.ptr, st->st_enc_key.len);
e->cbc_crypt(&ctx, buf, size, st->st_new_iv, enc);
*/
enc_alg = oakley_to_encryption_algorithm(e->algo_id);
crypter = lib->crypto->create_crypter(lib->crypto, enc_alg, st->st_enc_key.len);
crypter->set_key(crypter, st->st_enc_key);
crypter_block_size = crypter->get_block_size(crypter);
/* form iv by truncation */
passert(st->st_new_iv_len >= crypter_block_size);
st->st_new_iv_len = crypter_block_size;
iv = chunk_create(st->st_new_iv, st->st_new_iv_len);
if (enc)
{
crypter->encrypt(crypter, data, iv, NULL);
new_iv = data.ptr + data.len - crypter_block_size;
}
else
{
new_iv = alloca(crypter_block_size);
memcpy(new_iv, data.ptr + data.len - crypter_block_size,
crypter_block_size);
crypter->decrypt(crypter, data, iv, NULL);
}
crypter->destroy(crypter);
memcpy(st->st_new_iv, new_iv, crypter_block_size);
}
encryption_algorithm_t oakley_to_encryption_algorithm(int alg)