early-access version 1255

externals/libressl/crypto/cmac/cm_pmeth.c

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+/* $OpenBSD: cm_pmeth.c,v 1.8 2014/07/11 08:44:48 jsing Exp $ */
+/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
+ * project 2010.
+ */
+/* ====================================================================
+ * Copyright (c) 2010 The OpenSSL Project.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ *    software must display the following acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ *    endorse or promote products derived from this software without
+ *    prior written permission. For written permission, please contact
+ *    licensing@OpenSSL.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ *    nor may "OpenSSL" appear in their names without prior written
+ *    permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ *    acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ====================================================================
+ */
+
+#include <stdio.h>
+#include <string.h>
+
+#include <openssl/cmac.h>
+#include <openssl/evp.h>
+#include <openssl/x509.h>
+#include <openssl/x509v3.h>
+
+#include "evp_locl.h"
+
+/* The context structure and "key" is simply a CMAC_CTX */
+
+static int
+pkey_cmac_init(EVP_PKEY_CTX *ctx)
+{
+	ctx->data = CMAC_CTX_new();
+	if (!ctx->data)
+		return 0;
+	ctx->keygen_info_count = 0;
+	return 1;
+}
+
+static int
+pkey_cmac_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
+{
+	if (!pkey_cmac_init(dst))
+		return 0;
+	if (!CMAC_CTX_copy(dst->data, src->data))
+		return 0;
+	return 1;
+}
+
+static void
+pkey_cmac_cleanup(EVP_PKEY_CTX *ctx)
+{
+	CMAC_CTX_free(ctx->data);
+}
+
+static int
+pkey_cmac_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
+{
+	CMAC_CTX *cmkey = CMAC_CTX_new();
+	CMAC_CTX *cmctx = ctx->data;
+
+	if (!cmkey)
+		return 0;
+	if (!CMAC_CTX_copy(cmkey, cmctx)) {
+		CMAC_CTX_free(cmkey);
+		return 0;
+	}
+	EVP_PKEY_assign(pkey, EVP_PKEY_CMAC, cmkey);
+
+	return 1;
+}
+
+static int
+int_update(EVP_MD_CTX *ctx, const void *data, size_t count)
+{
+	if (!CMAC_Update(ctx->pctx->data, data, count))
+		return 0;
+	return 1;
+}
+
+static int
+cmac_signctx_init(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx)
+{
+	EVP_MD_CTX_set_flags(mctx, EVP_MD_CTX_FLAG_NO_INIT);
+	mctx->update = int_update;
+	return 1;
+}
+
+static int
+cmac_signctx(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
+    EVP_MD_CTX *mctx)
+{
+	return CMAC_Final(ctx->data, sig, siglen);
+}
+
+static int
+pkey_cmac_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
+{
+	CMAC_CTX *cmctx = ctx->data;
+
+	switch (type) {
+	case EVP_PKEY_CTRL_SET_MAC_KEY:
+		if (!p2 || p1 < 0)
+			return 0;
+		if (!CMAC_Init(cmctx, p2, p1, NULL, NULL))
+			return 0;
+		break;
+
+	case EVP_PKEY_CTRL_CIPHER:
+		if (!CMAC_Init(cmctx, NULL, 0, p2, ctx->engine))
+			return 0;
+		break;
+
+	case EVP_PKEY_CTRL_MD:
+		if (ctx->pkey && !CMAC_CTX_copy(ctx->data,
+		    (CMAC_CTX *)ctx->pkey->pkey.ptr))
+			return 0;
+		if (!CMAC_Init(cmctx, NULL, 0, NULL, NULL))
+			return 0;
+		break;
+
+	default:
+		return -2;
+	}
+	return 1;
+}
+
+static int
+pkey_cmac_ctrl_str(EVP_PKEY_CTX *ctx, const char *type, const char *value)
+{
+	if (!value)
+		return 0;
+	if (!strcmp(type, "key")) {
+		void *p = (void *)value;
+		return pkey_cmac_ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY,
+		    strlen(p), p);
+	}
+	if (!strcmp(type, "cipher")) {
+		const EVP_CIPHER *c;
+
+		c = EVP_get_cipherbyname(value);
+		if (!c)
+			return 0;
+		return pkey_cmac_ctrl(ctx, EVP_PKEY_CTRL_CIPHER, -1, (void *)c);
+	}
+	if (!strcmp(type, "hexkey")) {
+		unsigned char *key;
+		int r;
+		long keylen;
+
+		key = string_to_hex(value, &keylen);
+		if (!key)
+			return 0;
+		r = pkey_cmac_ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, keylen, key);
+		free(key);
+		return r;
+	}
+
+	return -2;
+}
+
+const EVP_PKEY_METHOD cmac_pkey_meth = {
+	.pkey_id = EVP_PKEY_CMAC,
+	.flags = EVP_PKEY_FLAG_SIGCTX_CUSTOM,
+
+	.init = pkey_cmac_init,
+	.copy = pkey_cmac_copy,
+	.cleanup = pkey_cmac_cleanup,
+
+	.keygen = pkey_cmac_keygen,
+
+	.signctx_init = cmac_signctx_init,
+	.signctx = cmac_signctx,
+
+	.ctrl = pkey_cmac_ctrl,
+	.ctrl_str = pkey_cmac_ctrl_str
+};