--- /dev/null
+/*
+ * Copyright 2018 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL license (the "License"). You may not use
+ * this file except in compliance with the License. You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+#include <stdio.h>
+#include "internal/cryptlib.h"
+#include <openssl/x509.h>
+#include <openssl/x509v3.h>
+#include <openssl/evp.h>
+#include <openssl/cmac.h>
+#include "internal/evp_int.h"
+
+/* local CMAC pkey structure */
+
+/* typedef EVP_MAC_IMPL */
+struct evp_mac_impl_st {
+ /* tmpcipher and tmpengine are set to NULL after a CMAC_Init call */
+ const EVP_CIPHER *tmpcipher; /* cached CMAC cipher */
+ const ENGINE *tmpengine; /* cached CMAC cipher engine */
+ CMAC_CTX *ctx;
+};
+
+static EVP_MAC_IMPL *cmac_new(void)
+{
+ EVP_MAC_IMPL *cctx;
+
+ if ((cctx = OPENSSL_zalloc(sizeof(*cctx))) == NULL
+ || (cctx->ctx = CMAC_CTX_new()) == NULL) {
+ OPENSSL_free(cctx);
+ cctx = NULL;
+ }
+
+ return cctx;
+}
+
+static void cmac_free(EVP_MAC_IMPL *cctx)
+{
+ if (cctx != NULL) {
+ CMAC_CTX_free(cctx->ctx);
+ OPENSSL_free(cctx);
+ }
+}
+
+static int cmac_copy(EVP_MAC_IMPL *cdst, EVP_MAC_IMPL *csrc)
+{
+ if (!CMAC_CTX_copy(cdst->ctx, csrc->ctx))
+ return 0;
+
+ cdst->tmpengine = csrc->tmpengine;
+ cdst->tmpcipher = csrc->tmpcipher;
+ return 1;
+}
+
+static size_t cmac_size(EVP_MAC_IMPL *cctx)
+{
+ return EVP_CIPHER_CTX_block_size(CMAC_CTX_get0_cipher_ctx(cctx->ctx));
+}
+
+static int cmac_init(EVP_MAC_IMPL *cctx)
+{
+ int rv = CMAC_Init(cctx->ctx, NULL, 0, cctx->tmpcipher,
+ (ENGINE *)cctx->tmpengine);
+ cctx->tmpcipher = NULL;
+ cctx->tmpengine = NULL;
+
+ return rv;
+}
+
+static int cmac_update(EVP_MAC_IMPL *cctx, const unsigned char *data,
+ size_t datalen)
+{
+ return CMAC_Update(cctx->ctx, data, datalen);
+}
+
+static int cmac_final(EVP_MAC_IMPL *cctx, unsigned char *out)
+{
+ size_t hlen;
+
+ return CMAC_Final(cctx->ctx, out, &hlen);
+}
+
+static int cmac_ctrl(EVP_MAC_IMPL *cctx, int cmd, va_list args)
+{
+ switch (cmd) {
+ case EVP_MAC_CTRL_SET_KEY:
+ {
+ const unsigned char *key = va_arg(args, const unsigned char *);
+ size_t keylen = va_arg(args, size_t);
+ int rv = CMAC_Init(cctx->ctx, key, keylen, cctx->tmpcipher,
+ (ENGINE *)cctx->tmpengine);
+
+ cctx->tmpcipher = NULL;
+ cctx->tmpengine = NULL;
+
+ return rv;
+ }
+ break;
+ case EVP_MAC_CTRL_SET_CIPHER:
+ cctx->tmpcipher = va_arg(args, const EVP_CIPHER *);
+ break;
+ case EVP_MAC_CTRL_SET_ENGINE:
+ cctx->tmpengine = va_arg(args, const ENGINE *);
+ break;
+ default:
+ return -2;
+ }
+ return 1;
+}
+
+static int cmac_ctrl_int(EVP_MAC_IMPL *hctx, int cmd, ...)
+{
+ int rv;
+ va_list args;
+
+ va_start(args, cmd);
+ rv = cmac_ctrl(hctx, cmd, args);
+ va_end(args);
+
+ return rv;
+}
+
+static int cmac_ctrl_str_cb(void *hctx, int cmd, void *buf, size_t buflen)
+{
+ return cmac_ctrl_int(hctx, cmd, buf, buflen);
+}
+
+static int cmac_ctrl_str(EVP_MAC_IMPL *cctx, const char *type,
+ const char *value)
+{
+ if (!value)
+ return 0;
+ if (strcmp(type, "cipher") == 0) {
+ const EVP_CIPHER *c = EVP_get_cipherbyname(value);
+
+ if (c == NULL)
+ return 0;
+ return cmac_ctrl_int(cctx, EVP_MAC_CTRL_SET_CIPHER, c);
+ }
+ if (strcmp(type, "key") == 0)
+ return EVP_str2ctrl(cmac_ctrl_str_cb, cctx, EVP_MAC_CTRL_SET_KEY,
+ value);
+ if (strcmp(type, "hexkey") == 0)
+ return EVP_hex2ctrl(cmac_ctrl_str_cb, cctx, EVP_MAC_CTRL_SET_KEY,
+ value);
+ return -2;
+}
+
+const EVP_MAC cmac_meth = {
+ EVP_MAC_CMAC,
+ cmac_new,
+ cmac_copy,
+ cmac_free,
+ cmac_size,
+ cmac_init,
+ cmac_update,
+ cmac_final,
+ cmac_ctrl,
+ cmac_ctrl_str
+};
--- /dev/null
+=pod
+
+=head1 NAME
+
+EVP_MAC_CMAC - The CMAC EVP_MAC implementation
+
+=head1 DESCRIPTION
+
+Support for computing CMAC MACs through the B<EVP_MAC> API.
+
+=head2 Numeric identity
+
+B<EVP_MAC_CMAC> is the numeric identity for this implementation, and
+can be used in functions like EVP_MAC_CTX_new_id() and
+EVP_get_macbynid().
+
+=head2 Supported controls
+
+The supported controls are:
+
+=over 4
+
+=item B<EVP_MAC_CTRL_SET_KEY>
+
+EVP_MAC_ctrl_str() takes to type string for this control:
+
+=over 4
+
+=item "key"
+
+The value string is used as is.
+
+=item "hexkey"
+
+The value string is expected to be a hexadecimal number, which will be
+decoded before passing on as control value.
+
+=back
+
+=item B<EVP_MAC_CTRL_SET_ENGINE>
+
+=item B<EVP_MAC_CTRL_SET_CIPHER>
+
+These work as described in L<EVP_MAC(3)/CONTROLS>.
+
+EVP_MAC_ctrl_str() type string for B<EVP_MAC_CTRL_SET_CIPHER>: "cipher"
+
+The value is expected to be the name of a cipher.
+
+=back
+
+=head1 SEE ALSO
+
+L<EVP_MAC_ctrl(3)>, L<EVP_MAC(3)/CONTROLS>
+
+=head1 COPYRIGHT
+
+Copyright 2018 The OpenSSL Project Authors. All Rights Reserved.
+
+Licensed under the OpenSSL license (the "License"). You may not use
+this file except in compliance with the License. You can obtain a copy
+in the file LICENSE in the source distribution or at
+L<https://www.openssl.org/source/license.html>.
+
+=cut
projects / oweals / openssl.git / commitdiff