Move definition of INTxx_MIN et al to internal header

Having the INTxx_MIN et al macros defined in a public header is
unnecessary and risky.  Also, it wasn't done for all platforms that
might need it.

So we move those numbers to an internal header file, do the math
ourselves and make sure to account for the integer representations we
know of.

This introduces include/internal, which is unproblematic since we
already use -I$(TOP)/include everywhere.  This directory is different
from crypto/include/internal, as the former is more general internal
headers for all of OpenSSL, while the latter is for libcrypto only.
Reviewed-by: NMatt Caswell <matt@openssl.org>

include/internal/numbers.h

+/* ====================================================================
+ * 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
+ *    openssl-core@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.
+ * ====================================================================
+ *
+ * This product includes cryptographic software written by Eric Young
+ * (eay@cryptsoft.com).  This product includes software written by Tim
+ * Hudson (tjh@cryptsoft.com).
+ *
+ */
+
+#ifndef HEADER_NUMBERS_H
+# define HEADER_NUMBERS_H
+
+# include <limits.h>
+
+# if (-1 & 3) == 0x03		/* Two's complement */
+
+#  define __MAXUINT__(T) ((T) -1)
+#  define __MAXINT__(T) ((T) ((((T) 1) << ((sizeof(T) * CHAR_BIT) - 1)) ^ __MAXUINT__(T)))
+#  define __MININT__(T) (-__MAXINT__(T) - 1)
+
+# elif (-1 & 3) == 0x02		/* One's complement */
+
+#  define __MAXUINT__(T) (((T) -1) + 1)
+#  define __MAXINT__(T) ((T) ((((T) 1) << ((sizeof(T) * CHAR_BIT) - 1)) ^ __MAXUINT__(T)))
+#  define __MININT__(T) (-__MAXINT__(T))
+
+# elif (-1 & 3) == 0x01		/* Sign/magnitude */
+
+#  define __MAXINT__(T) ((T) (((((T) 1) << ((sizeof(T) * CHAR_BIT) - 2)) - 1) | (((T) 1) << ((sizeof(T) * CHAR_BIT) - 2))))
+#  define __MAXUINT__(T) ((T) (__MAXINT__(T) | (((T) 1) << ((sizeof(T) * CHAR_BIT) - 1))))
+#  define __MININT__(T) (-__MAXINT__(T))
+
+# else
+
+#  error "do not know the integer encoding on this architecture"
+
+# endif
+
+# ifndef INT8_MAX
+#  define INT8_MIN __MININT__(int8_t)
+#  define INT8_MAX __MAXINT__(int8_t)
+#  define UINT8_MAX __MAXUINT__(uint8_t)
+# endif
+
+# ifndef INT16_MAX
+#  define INT16_MIN __MININT__(int16_t)
+#  define INT16_MAX __MAXINT__(int16_t)
+#  define UINT16_MAX __MAXUINT__(uint16_t)
+# endif
+
+# ifndef INT32_MAX
+#  define INT32_MIN __MININT__(int32_t)
+#  define INT32_MAX __MAXINT__(int32_t)
+#  define UINT32_MAX __MAXUINT__(uint32_t)
+# endif
+
+# ifndef INT64_MAX
+#  define INT64_MIN __MININT__(int64_t)
+#  define INT64_MAX __MAXINT__(int64_t)
+#  define UINT64_MAX __MAXUINT__(uint64_t)
+# endif
+
+#endif
+

include/openssl/e_os2.h

@@ -284,25 +284,6 @@ typedef int int32_t;
 typedef unsigned int uint32_t;
 typedef __int64 int64_t;
 typedef unsigned __int64 uint64_t;
-
-#  include <limits.h>
-
-#  define INT8_MAX    SCHAR_MAX
-#  define INT8_MIN    SCHAR_MIN
-#  define UINT8_MAX   UCHAR_MAX
-
-#  define INT16_MAX   SHRT_MAX
-#  define INT16_MIN   SHRT_MIN
-#  define UINT16_MAX  USHRT_MAX
-
-#  define INT32_MAX   INT_MAX
-#  define INT32_MIN   INT_MIN
-#  define UINT32_MAX  UINT_MAX
-
-#  define INT64_MAX   _I64_MAX
-#  define INT64_MIN   _I64_MIN
-#  define UINT64_MAX  _UI64_MAX
-
 # else
 #  include <stdint.h>
 # endif