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#include "ssh_cipher.h"
struct evp_priv
{
SSH_EVP evp;
EVP_CIPHER_CTX *ctx;
int enc;
};
static int
cipher_init(SSH_CIPHER* my)
{
struct evp_priv *priv = (struct evp_priv*)my->priv;
priv->ctx = EVP_CIPHER_CTX_new();
EVP_CIPHER_CTX_init(priv->ctx);
return EVP_CipherInit(priv->ctx, priv->evp(), my->key, my->IV, priv->enc);
}
static int
do_crypt(SSH_CIPHER* my, const uint8_t* in, uint8_t* out, size_t l)
{
return EVP_Cipher(((struct evp_priv*)my->priv)->ctx, out, in, l);
}
static void
cleanup(SSH_CIPHER* my)
{
if (my->IV!=NULL)
free(my->IV);
if (my->key!=NULL)
free(my->key);
if (my->priv!=NULL) {
struct evp_priv *priv = my->priv;
if (priv->ctx!=NULL)
EVP_CIPHER_CTX_free(priv->ctx);
free(priv);
}
free(my);
}
SSH_CIPHER*
new_ssh_cipher_evp(SSH_EVP evp, size_t ks, size_t is, size_t bs, int enc)
{
SSH_CIPHER *cipher = (SSH_CIPHER*)malloc(sizeof(SSH_CIPHER));
cipher->priv = malloc(sizeof(struct evp_priv));
struct evp_priv *priv = (struct evp_priv*)cipher->priv;
priv->evp = evp;
priv->enc = enc;
priv->ctx = NULL;
cipher->blkSize = bs;
cipher->keySize = ks;
cipher->IVSize = is;
cipher->key = (unsigned char*)malloc(ks);
cipher->IV = (unsigned char*)malloc(is);
cipher->init = cipher_init;
cipher->crypt = do_crypt;
cipher->cleanup = cleanup;
return cipher;
}
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