:-'Generic Commit'

dropshell-tool/openssl-1.1.1w/crypto/ec/curve448/word.h

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+/*
+ * Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright 2014 Cryptography Research, Inc.
+ *
+ * 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
+ *
+ * Originally written by Mike Hamburg
+ */
+
+#ifndef OSSL_CRYPTO_EC_CURVE448_WORD_H
+# define OSSL_CRYPTO_EC_CURVE448_WORD_H
+
+# include <string.h>
+# include <assert.h>
+# include <stdlib.h>
+# include <openssl/e_os2.h>
+# include "arch_intrinsics.h"
+# include "curve448utils.h"
+
+# if (ARCH_WORD_BITS == 64)
+typedef uint64_t word_t, mask_t;
+typedef __uint128_t dword_t;
+typedef int32_t hsword_t;
+typedef int64_t sword_t;
+typedef __int128_t dsword_t;
+# elif (ARCH_WORD_BITS == 32)
+typedef uint32_t word_t, mask_t;
+typedef uint64_t dword_t;
+typedef int16_t hsword_t;
+typedef int32_t sword_t;
+typedef int64_t dsword_t;
+# else
+#  error "For now, we only support 32- and 64-bit architectures."
+# endif
+
+/*
+ * Scalar limbs are keyed off of the API word size instead of the arch word
+ * size.
+ */
+# if C448_WORD_BITS == 64
+#  define SC_LIMB(x) (x)
+# elif C448_WORD_BITS == 32
+#  define SC_LIMB(x) ((uint32_t)(x)),((x) >> 32)
+# else
+#  error "For now we only support 32- and 64-bit architectures."
+# endif
+
+/*
+ * The plan on booleans: The external interface uses c448_bool_t, but this
+ * might be a different size than our particular arch's word_t (and thus
+ * mask_t).  Also, the caller isn't guaranteed to pass it as nonzero.  So
+ * bool_to_mask converts word sizes and checks nonzero. On the flip side,
+ * mask_t is always -1 or 0, but it might be a different size than
+ * c448_bool_t. On the third hand, we have success vs boolean types, but
+ * that's handled in common.h: it converts between c448_bool_t and
+ * c448_error_t.
+ */
+static ossl_inline c448_bool_t mask_to_bool(mask_t m)
+{
+    return (c448_sword_t)(sword_t)m;
+}
+
+static ossl_inline mask_t bool_to_mask(c448_bool_t m)
+{
+    /* On most arches this will be optimized to a simple cast. */
+    mask_t ret = 0;
+    unsigned int i;
+    unsigned int limit = sizeof(c448_bool_t) / sizeof(mask_t);
+
+    if (limit < 1)
+        limit = 1;
+    for (i = 0; i < limit; i++)
+        ret |= ~word_is_zero(m >> (i * 8 * sizeof(word_t)));
+
+    return ret;
+}
+
+#endif                          /* OSSL_CRYPTO_EC_CURVE448_WORD_H */