+/*
+ * Copyright (c) 2019 Dmitry Belyavskiy <beldmit@gmail.com>
+ * Copyright (c) 2020 Vitaly Chikunov <vt@altlinux.org>
+ *
+ * Contents licensed under the terms of the OpenSSL license
+ * See https://www.openssl.org/source/license.html for details
+ */
#include <string.h>
#include <openssl/cmac.h>
#include <openssl/conf.h>
size_t dgst_size;
int cipher_nid;
int key_set;
+/*
+ * Here begins stuff related to TLSTREE processing
+ * We MUST store the original key to derive TLSTREE keys from it
+ * and TLS seq no.
+ * */
+ unsigned char key[32];
+/*
+ * TODO
+ * TLSTREE intermediate values should be recalculated only when
+ * C_i & (seq_no+1) != C_i & (seq_no)
+ * so somewhen we will store C_i & (seq_no) in this structure
+ * to avoid redundant hash calculations.
+ * */
} OMAC_CTX;
#define MAX_GOST_OMAC_SIZE 16
switch (cipher_nid) {
case NID_magma_cbc:
- c->dgst_size = 4;
+ c->dgst_size = 8;
break;
case NID_grasshopper_cbc:
- c->dgst_size = 8;
+ c->dgst_size = 16;
break;
}
return CMAC_Update(c->cmac_ctx, data, count);
}
-int omac_imit_final(EVP_MD_CTX *ctx, unsigned char *md)
+static int omac_imit_final(EVP_MD_CTX *ctx, unsigned char *md)
{
OMAC_CTX *c = EVP_MD_CTX_md_data(ctx);
unsigned char mac[MAX_GOST_OMAC_SIZE];
return 1;
}
-int omac_imit_copy(EVP_MD_CTX *to, const EVP_MD_CTX *from)
+static int omac_imit_copy(EVP_MD_CTX *to, const EVP_MD_CTX *from)
{
OMAC_CTX *c_to = EVP_MD_CTX_md_data(to);
const OMAC_CTX *c_from = EVP_MD_CTX_md_data(from);
c_to->dgst_size = c_from->dgst_size;
c_to->cipher_nid = c_from->cipher_nid;
c_to->key_set = c_from->key_set;
+ memcpy(c_to->key, c_from->key, 32);
} else {
return 0;
}
}
/* Clean up imit ctx */
-int omac_imit_cleanup(EVP_MD_CTX *ctx)
+static int omac_imit_cleanup(EVP_MD_CTX *ctx)
{
OMAC_CTX *c = EVP_MD_CTX_md_data(ctx);
{
int ret = 0;
+ CMAC_CTX_free(c->cmac_ctx);
c->cmac_ctx = CMAC_CTX_new();
if (c->cmac_ctx == NULL) {
GOSTerr(GOST_F_OMAC_KEY, ERR_R_MALLOC_FAILURE);
return 1;
}
+/* Called directly by gost_kexp15() */
int omac_imit_ctrl(EVP_MD_CTX *ctx, int type, int arg, void *ptr)
{
switch (type) {
OMAC_CTX *c = EVP_MD_CTX_md_data(ctx);
const EVP_MD *md = EVP_MD_CTX_md(ctx);
const EVP_CIPHER *cipher = NULL;
+ int ret = 0;
if (c->cipher_nid == NID_undef) {
switch (EVP_MD_nid(md)) {
if (arg == 0) {
struct gost_mac_key *key = (struct gost_mac_key *)ptr;
- return omac_key(c, cipher, key->key, 32);
-
+ ret = omac_key(c, cipher, key->key, 32);
+ if (ret > 0)
+ memcpy(c->key, key->key, 32);
+ return ret;
} else if (arg == 32) {
- return omac_key(c, cipher, ptr, 32);
+ ret = omac_key(c, cipher, ptr, 32);
+ if (ret > 0)
+ memcpy(c->key, ptr, 32);
+ return ret;
}
GOSTerr(GOST_F_OMAC_IMIT_CTRL, GOST_R_INVALID_MAC_KEY_SIZE);
return 0;
}
- case EVP_MD_CTRL_MAC_LEN:
+ case EVP_MD_CTRL_XOF_LEN: /* Supported in OpenSSL */
{
OMAC_CTX *c = EVP_MD_CTX_md_data(ctx);
switch (c->cipher_nid) {
}
return 1;
}
-
+#ifdef EVP_MD_CTRL_TLSTREE
+ case EVP_MD_CTRL_TLSTREE:
+ {
+ OMAC_CTX *c = EVP_MD_CTX_md_data(ctx);
+ if (c->key_set) {
+ unsigned char diversed_key[32];
+ return gost_tlstree(c->cipher_nid, c->key, diversed_key,
+ (const unsigned char *)ptr) ?
+ omac_key(c, EVP_get_cipherbynid(c->cipher_nid),
+ diversed_key, 32) : 0;
+ }
+ GOSTerr(GOST_F_OMAC_IMIT_CTRL, GOST_R_BAD_ORDER);
+ return 0;
+ }
+ return 0;
+#endif
default:
return 0;
}
}
-static EVP_MD *_hidden_magma_mac_md = NULL;
-
-EVP_MD *magma_omac(void)
-{
- if (_hidden_magma_mac_md == NULL) {
- EVP_MD *md;
-
- if ((md = EVP_MD_meth_new(NID_magma_mac, NID_undef)) == NULL
- || !EVP_MD_meth_set_result_size(md, 4)
- || !EVP_MD_meth_set_input_blocksize(md, 8)
- || !EVP_MD_meth_set_app_datasize(md, sizeof(OMAC_CTX))
- || !EVP_MD_meth_set_flags(md, 0)
- || !EVP_MD_meth_set_init(md, magma_imit_init)
- || !EVP_MD_meth_set_update(md, omac_imit_update)
- || !EVP_MD_meth_set_final(md, omac_imit_final)
- || !EVP_MD_meth_set_copy(md, omac_imit_copy)
- || !EVP_MD_meth_set_cleanup(md, omac_imit_cleanup)
- || !EVP_MD_meth_set_ctrl(md, omac_imit_ctrl)) {
- EVP_MD_meth_free(md);
- md = NULL;
- }
- _hidden_magma_mac_md = md;
- }
- return _hidden_magma_mac_md;
-}
-
-void magma_omac_destroy(void)
-{
- EVP_MD_meth_free(_hidden_magma_mac_md);
- _hidden_magma_mac_md = NULL;
-}
-
-static EVP_MD *_hidden_grasshopper_mac_md = NULL;
-
-EVP_MD *grasshopper_omac(void)
-{
- if (_hidden_grasshopper_mac_md == NULL) {
- EVP_MD *md;
-
- if ((md = EVP_MD_meth_new(NID_grasshopper_mac, NID_undef)) == NULL
- || !EVP_MD_meth_set_result_size(md, 8)
- || !EVP_MD_meth_set_input_blocksize(md, 8)
- || !EVP_MD_meth_set_app_datasize(md, sizeof(OMAC_CTX))
- || !EVP_MD_meth_set_flags(md, 0)
- || !EVP_MD_meth_set_init(md, grasshopper_imit_init)
- || !EVP_MD_meth_set_update(md, omac_imit_update)
- || !EVP_MD_meth_set_final(md, omac_imit_final)
- || !EVP_MD_meth_set_copy(md, omac_imit_copy)
- || !EVP_MD_meth_set_cleanup(md, omac_imit_cleanup)
- || !EVP_MD_meth_set_ctrl(md, omac_imit_ctrl)) {
- EVP_MD_meth_free(md);
- md = NULL;
- }
- _hidden_grasshopper_mac_md = md;
- }
- return _hidden_grasshopper_mac_md;
-}
-
-void grasshopper_omac_destroy(void)
-{
- EVP_MD_meth_free(_hidden_grasshopper_mac_md);
- _hidden_grasshopper_mac_md = NULL;
-}
+static GOST_digest omac_template_digest = {
+ .input_blocksize = 8,
+ .app_datasize = sizeof(OMAC_CTX),
+ .flags = EVP_MD_FLAG_XOF,
+ .update = omac_imit_update,
+ .final = omac_imit_final,
+ .copy = omac_imit_copy,
+ .cleanup = omac_imit_cleanup,
+ .ctrl = omac_imit_ctrl,
+};
+
+GOST_digest magma_mac_digest = {
+ .nid = NID_magma_mac,
+ .template = &omac_template_digest,
+ .result_size = 8,
+ .init = magma_imit_init,
+};
+
+GOST_digest grasshopper_mac_digest = {
+ .nid = NID_grasshopper_mac,
+ .template = &omac_template_digest,
+ .result_size = 16,
+ .init = grasshopper_imit_init,
+};
projects / openssl-gost / engine.git / blobdiff