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split encrypt/decrypt functionality of crypto_cbc()

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This commit is contained in:
Andreas Steffen
2009-05-14 21:04:49 +02:00
parent 7121eca633
commit 8bdc0327fb
4 changed files with 44 additions and 46 deletions
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src/pluto/crypto.c
-36
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@@ -544,42 +544,6 @@ static void do_3des(u_int8_t *buf, size_t buf_len, u_int8_t *key,
(des_cblock *)iv, enc);
}
void crypto_cbc_encrypt(const struct encrypt_desc *e, bool enc, u_int8_t *buf,
size_t size, struct state *st)
{
chunk_t data = { buf, size };
chunk_t iv;
char *new_iv;
size_t crypter_block_size;
encryption_algorithm_t enc_alg;
crypter_t *crypter;
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)
{
switch (alg)