Disallow change EVP_CIPHER properties once set
@@ -54,18 +54,27 @@ void EVP_CIPHER_meth_free(EVP_CIPHER *cipher)
int EVP_CIPHER_meth_set_iv_length(EVP_CIPHER *cipher, int iv_len)
{
+ if (cipher->iv_len != 0)
+ return 0;
+
cipher->iv_len = iv_len;
return 1;
}
int EVP_CIPHER_meth_set_flags(EVP_CIPHER *cipher, unsigned long flags)
{
+ if (cipher->flags != 0)
+ return 0;
+
cipher->flags = flags;
return 1;
}
int EVP_CIPHER_meth_set_impl_ctx_size(EVP_CIPHER *cipher, int ctx_size)
{
+ if (cipher->ctx_size != 0)
+ return 0;
+
cipher->ctx_size = ctx_size;
return 1;
}
@@ -76,6 +85,9 @@ int EVP_CIPHER_meth_set_init(EVP_CIPHER *cipher,
const unsigned char *iv,
int enc))
{
+ if (cipher->init != NULL)
+ return 0;
+
cipher->init = init;
return 1;
}
@@ -86,6 +98,9 @@ int EVP_CIPHER_meth_set_do_cipher(EVP_CIPHER *cipher,
const unsigned char *in,
size_t inl))
{
+ if (cipher->do_cipher != NULL)
+ return 0;
+
cipher->do_cipher = do_cipher;
return 1;
}
@@ -93,6 +108,9 @@ int EVP_CIPHER_meth_set_do_cipher(EVP_CIPHER *cipher,
int EVP_CIPHER_meth_set_cleanup(EVP_CIPHER *cipher,
int (*cleanup) (EVP_CIPHER_CTX *))
{
+ if (cipher->cleanup != NULL)
+ return 0;
+
cipher->cleanup = cleanup;
return 1;
}
@@ -101,6 +119,9 @@ int EVP_CIPHER_meth_set_set_asn1_params(EVP_CIPHER *cipher,
int (*set_asn1_parameters) (EVP_CIPHER_CTX *,
ASN1_TYPE *))
{
+ if (cipher->set_asn1_parameters != NULL)
+ return 0;
+
cipher->set_asn1_parameters = set_asn1_parameters;
return 1;
}
@@ -109,6 +130,9 @@ int EVP_CIPHER_meth_set_get_asn1_params(EVP_CIPHER *cipher,
int (*get_asn1_parameters) (EVP_CIPHER_CTX *,
ASN1_TYPE *))
{
+ if (cipher->get_asn1_parameters != NULL)
+ return 0;
+
cipher->get_asn1_parameters = get_asn1_parameters;
return 1;
}
@@ -117,6 +141,9 @@ int EVP_CIPHER_meth_set_ctrl(EVP_CIPHER *cipher,
int (*ctrl) (EVP_CIPHER_CTX *, int type,
int arg, void *ptr))
{
+ if (cipher->ctrl != NULL)
+ return 0;
+
cipher->ctrl = ctrl;
return 1;
}
