Add MD5+SHA1

Add digest combining MD5 and SHA1. This is used by RSA signatures for
TLS 1.1 and earlier.
Reviewed-by: NTim Hudson <tjh@openssl.org>

crypto/evp/Makefile

@@ -20,7 +20,7 @@ LIBSRC= encode.c digest.c evp_enc.c evp_key.c evp_acnf.c evp_cnf.c \
 	e_rc4.c e_aes.c names.c e_seed.c \
 	e_xcbc_d.c e_rc2.c e_cast.c e_rc5.c \
 	m_null.c m_md2.c m_md4.c m_md5.c m_sha1.c m_wp.c \
-	m_dss1.c m_mdc2.c m_ripemd.c m_ecdsa.c\
+	m_md5_sha1.c m_dss1.c m_mdc2.c m_ripemd.c m_ecdsa.c\
 	p_open.c p_seal.c p_sign.c p_verify.c p_lib.c p_enc.c p_dec.c \
 	bio_md.c bio_b64.c bio_enc.c evp_err.c e_null.c \
 	c_all.c c_allc.c c_alld.c evp_lib.c bio_ok.c \
@@ -33,7 +33,7 @@ LIBOBJ=	encode.o digest.o evp_enc.o evp_key.o evp_acnf.o evp_cnf.o \
 	e_rc4.o e_aes.o names.o e_seed.o \
 	e_xcbc_d.o e_rc2.o e_cast.o e_rc5.o \
 	m_null.o m_md2.o m_md4.o m_md5.o m_sha1.o m_wp.o \
-	m_dss1.o m_mdc2.o m_ripemd.o m_ecdsa.o\
+	m_md5_sha1.o m_dss1.o m_mdc2.o m_ripemd.o m_ecdsa.o\
 	p_open.o p_seal.o p_sign.o p_verify.o p_lib.o p_enc.o p_dec.o \
 	bio_md.o bio_b64.o bio_enc.o evp_err.o e_null.o \
 	c_all.o c_allc.o c_alld.o evp_lib.o bio_ok.o \

crypto/evp/c_alld.c

@@ -70,6 +70,7 @@ void OpenSSL_add_all_digests(void)
 #ifndef OPENSSL_NO_MD5
     EVP_add_digest(EVP_md5());
     EVP_add_digest_alias(SN_md5, "ssl3-md5");
+    EVP_add_digest(EVP_md5_sha1());
 #endif
     EVP_add_digest(EVP_sha1());
     EVP_add_digest_alias(SN_sha1, "ssl3-sha1");

crypto/evp/m_md5_sha1.c

+/* crypto/evp/m_md5_sha1.c */
+/*
+ * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
+ * project.
+ */
+/* ====================================================================
+ * Copyright (c) 2015 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.
+ * ====================================================================
+ */
+
+#if !defined(OPENSSL_NO_MD5) && !defined(OPENSSL_NO_SHA1)
+
+# include <openssl/evp.h>
+# include <openssl/objects.h>
+# include <openssl/x509.h>
+# include <openssl/md5.h>
+# include <openssl/sha.h>
+# ifndef OPENSSL_NO_RSA
+#  include <openssl/rsa.h>
+# endif
+
+struct md5_sha1_ctx {
+    MD5_CTX md5;
+    SHA_CTX sha1;
+};
+
+static int init(EVP_MD_CTX *ctx)
+{
+    struct md5_sha1_ctx *mctx = ctx->md_data;
+    if (!MD5_Init(&mctx->md5))
+        return 0;
+    return SHA1_Init(&mctx->sha1);
+}
+
+static int update(EVP_MD_CTX *ctx, const void *data, size_t count)
+{
+    struct md5_sha1_ctx *mctx = ctx->md_data;
+    if (!MD5_Update(&mctx->md5, data, count))
+        return 0;
+    return SHA1_Update(&mctx->sha1, data, count);
+}
+
+static int final(EVP_MD_CTX *ctx, unsigned char *md)
+{
+    struct md5_sha1_ctx *mctx = ctx->md_data;
+    if (!MD5_Final(md, &mctx->md5))
+        return 0;
+    return SHA1_Final(md + MD5_DIGEST_LENGTH, &mctx->sha1);
+}
+
+static const EVP_MD md5_sha1_md = {
+    NID_md5_sha1,
+    NID_md5_sha1,
+    MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH,
+    0,
+    init,
+    update,
+    final,
+    NULL,
+    NULL,
+    EVP_PKEY_RSA_method,
+    MD5_CBLOCK,
+    sizeof(EVP_MD *) + sizeof(struct md5_sha1_ctx),
+};
+
+const EVP_MD *EVP_md5_sha1(void)
+{
+    return &md5_sha1_md;
+}
+#endif

include/openssl/evp.h

@@ -766,6 +766,7 @@ const EVP_MD *EVP_md4(void);
 # endif
 # ifndef OPENSSL_NO_MD5
 const EVP_MD *EVP_md5(void);
+const EVP_MD *EVP_md5_sha1(void);
 # endif
 const EVP_MD *EVP_sha1(void);
 const EVP_MD *EVP_dss1(void);