Identify and move OpenSSL internal header files

There are header files in crypto/ that are used by the rest of
OpenSSL.  Move those to include/internal and adapt the affected source
code, Makefiles and scripts.

The header files that got moved are:

crypto/constant_time_locl.h
crypto/o_dir.h
crypto/o_str.h

Reviewed-by: Matt Caswell <matt@openssl.org>

3 files changed, 335 insertions, 0 deletions

diff --git a/include/internal/constant_time_locl.h b/include/internal/constant_time_locl.h
new file mode 100644
index 0000000000..c786aea949
--- /dev/null
+++ b/include/internal/constant_time_locl.h
@@ -0,0 +1,211 @@
+/* crypto/constant_time_locl.h */
+/*-
+ * Utilities for constant-time cryptography.
+ *
+ * Author: Emilia Kasper (emilia@openssl.org)
+ * Based on previous work by Bodo Moeller, Emilia Kasper, Adam Langley
+ * (Google).
+ * ====================================================================
+ * Copyright (c) 2014 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 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 acknowledgement:
+ *    "This product includes cryptographic software written by
+ *     Eric Young (eay@cryptsoft.com)"
+ *    The word 'cryptographic' can be left out if the rouines from the library
+ *    being used are not cryptographic related :-).
+ * 4. If you include any Windows specific code (or a derivative thereof) from
+ *    the apps directory (application code) you must include an acknowledgement:
+ *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
+ * ANY EXPRESS 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 AUTHOR OR 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.
+ *
+ * The licence and distribution terms for any publically available version or
+ * derivative of this code cannot be changed.  i.e. this code cannot simply be
+ * copied and put under another distribution licence
+ * [including the GNU Public Licence.]
+ */
+
+#ifndef HEADER_CONSTANT_TIME_LOCL_H
+# define HEADER_CONSTANT_TIME_LOCL_H
+
+# include "e_os.h"              /* For 'inline' */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*-
+ * The boolean methods return a bitmask of all ones (0xff...f) for true
+ * and 0 for false. This is useful for choosing a value based on the result
+ * of a conditional in constant time. For example,
+ *
+ * if (a < b) {
+ *   c = a;
+ * } else {
+ *   c = b;
+ * }
+ *
+ * can be written as
+ *
+ * unsigned int lt = constant_time_lt(a, b);
+ * c = constant_time_select(lt, a, b);
+ */
+
+/*
+ * Returns the given value with the MSB copied to all the other
+ * bits. Uses the fact that arithmetic shift shifts-in the sign bit.
+ * However, this is not ensured by the C standard so you may need to
+ * replace this with something else on odd CPUs.
+ */
+static inline unsigned int constant_time_msb(unsigned int a);
+
+/*
+ * Returns 0xff..f if a < b and 0 otherwise.
+ */
+static inline unsigned int constant_time_lt(unsigned int a, unsigned int b);
+/* Convenience method for getting an 8-bit mask. */
+static inline unsigned char constant_time_lt_8(unsigned int a,
+                                               unsigned int b);
+
+/*
+ * Returns 0xff..f if a >= b and 0 otherwise.
+ */
+static inline unsigned int constant_time_ge(unsigned int a, unsigned int b);
+/* Convenience method for getting an 8-bit mask. */
+static inline unsigned char constant_time_ge_8(unsigned int a,
+                                               unsigned int b);
+
+/*
+ * Returns 0xff..f if a == 0 and 0 otherwise.
+ */
+static inline unsigned int constant_time_is_zero(unsigned int a);
+/* Convenience method for getting an 8-bit mask. */
+static inline unsigned char constant_time_is_zero_8(unsigned int a);
+
+/*
+ * Returns 0xff..f if a == b and 0 otherwise.
+ */
+static inline unsigned int constant_time_eq(unsigned int a, unsigned int b);
+/* Convenience method for getting an 8-bit mask. */
+static inline unsigned char constant_time_eq_8(unsigned int a,
+                                               unsigned int b);
+/* Signed integers. */
+static inline unsigned int constant_time_eq_int(int a, int b);
+/* Convenience method for getting an 8-bit mask. */
+static inline unsigned char constant_time_eq_int_8(int a, int b);
+
+/*-
+ * Returns (mask & a) | (~mask & b).
+ *
+ * When |mask| is all 1s or all 0s (as returned by the methods above),
+ * the select methods return either |a| (if |mask| is nonzero) or |b|
+ * (if |mask| is zero).
+ */
+static inline unsigned int constant_time_select(unsigned int mask,
+                                                unsigned int a,
+                                                unsigned int b);
+/* Convenience method for unsigned chars. */
+static inline unsigned char constant_time_select_8(unsigned char mask,
+                                                   unsigned char a,
+                                                   unsigned char b);
+/* Convenience method for signed integers. */
+static inline int constant_time_select_int(unsigned int mask, int a, int b);
+
+static inline unsigned int constant_time_msb(unsigned int a)
+{
+    return 0 - (a >> (sizeof(a) * 8 - 1));
+}
+
+static inline unsigned int constant_time_lt(unsigned int a, unsigned int b)
+{
+    return constant_time_msb(a ^ ((a ^ b) | ((a - b) ^ b)));
+}
+
+static inline unsigned char constant_time_lt_8(unsigned int a, unsigned int b)
+{
+    return (unsigned char)(constant_time_lt(a, b));
+}
+
+static inline unsigned int constant_time_ge(unsigned int a, unsigned int b)
+{
+    return ~constant_time_lt(a, b);
+}
+
+static inline unsigned char constant_time_ge_8(unsigned int a, unsigned int b)
+{
+    return (unsigned char)(constant_time_ge(a, b));
+}
+
+static inline unsigned int constant_time_is_zero(unsigned int a)
+{
+    return constant_time_msb(~a & (a - 1));
+}
+
+static inline unsigned char constant_time_is_zero_8(unsigned int a)
+{
+    return (unsigned char)(constant_time_is_zero(a));
+}
+
+static inline unsigned int constant_time_eq(unsigned int a, unsigned int b)
+{
+    return constant_time_is_zero(a ^ b);
+}
+
+static inline unsigned char constant_time_eq_8(unsigned int a, unsigned int b)
+{
+    return (unsigned char)(constant_time_eq(a, b));
+}
+
+static inline unsigned int constant_time_eq_int(int a, int b)
+{
+    return constant_time_eq((unsigned)(a), (unsigned)(b));
+}
+
+static inline unsigned char constant_time_eq_int_8(int a, int b)
+{
+    return constant_time_eq_8((unsigned)(a), (unsigned)(b));
+}
+
+static inline unsigned int constant_time_select(unsigned int mask,
+                                                unsigned int a,
+                                                unsigned int b)
+{
+    return (mask & a) | (~mask & b);
+}
+
+static inline unsigned char constant_time_select_8(unsigned char mask,
+                                                   unsigned char a,
+                                                   unsigned char b)
+{
+    return (unsigned char)(constant_time_select(mask, a, b));
+}
+
+static inline int constant_time_select_int(unsigned int mask, int a, int b)
+{
+    return (int)(constant_time_select(mask, (unsigned)(a), (unsigned)(b)));
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif                          /* HEADER_CONSTANT_TIME_LOCL_H */
diff --git a/include/internal/o_dir.h b/include/internal/o_dir.h
new file mode 100644
index 0000000000..d55431194e
--- /dev/null
+++ b/include/internal/o_dir.h
@@ -0,0 +1,55 @@
+/* crypto/o_dir.h -*- mode:C; c-file-style: "eay" -*- */
+/*
+ * Copied from Richard Levitte's (richard@levitte.org) LP library.  All
+ * symbol names have been changed, with permission from the author.
+ */
+
+/* $LP: LPlib/source/LPdir.h,v 1.1 2004/06/14 08:56:04 _cvs_levitte Exp $ */
+/*
+ * Copyright (c) 2004, Richard Levitte <richard@levitte.org>
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS 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 REGENTS OR 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.
+ */
+
+#ifndef O_DIR_H
+# define O_DIR_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct OPENSSL_dir_context_st OPENSSL_DIR_CTX;
+
+  /*
+   * returns NULL on error or end-of-directory. If it is end-of-directory,
+   * errno will be zero
+   */
+const char *OPENSSL_DIR_read(OPENSSL_DIR_CTX **ctx, const char *directory);
+  /* returns 1 on success, 0 on error */
+int OPENSSL_DIR_end(OPENSSL_DIR_CTX **ctx);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif                          /* LPDIR_H */
diff --git a/include/internal/o_str.h b/include/internal/o_str.h
new file mode 100644
index 0000000000..5313528ed9
--- /dev/null
+++ b/include/internal/o_str.h
@@ -0,0 +1,69 @@
+/* crypto/o_str.h -*- mode:C; c-file-style: "eay" -*- */
+/*
+ * Written by Richard Levitte (richard@levitte.org) for the OpenSSL project
+ * 2003.
+ */
+/* ====================================================================
+ * Copyright (c) 2003 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.
+ * ====================================================================
+ *
+ * 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_O_STR_H
+# define HEADER_O_STR_H
+
+# include <stddef.h>            /* to get size_t */
+
+int OPENSSL_strcasecmp(const char *str1, const char *str2);
+int OPENSSL_strncasecmp(const char *str1, const char *str2, size_t n);
+int OPENSSL_memcmp(const void *p1, const void *p2, size_t n);
+
+#endif