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external/nrf_oberon/include/ocrypto_sc_p224.h

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+/**
+ * Copyright (c) 2021, Nordic Semiconductor ASA
+ *
+ * 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, except as embedded into a Nordic
+ *    Semiconductor ASA integrated circuit in a product or a software update for
+ *    such product, 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. Neither the name of Nordic Semiconductor ASA nor the names of its
+ *    contributors may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ *
+ * 4. This software, with or without modification, must only be used with a
+ *    Nordic Semiconductor ASA integrated circuit.
+ *
+ * 5. Any software provided in binary form under this license must not be reverse
+ *    engineered, decompiled, modified and/or disassembled.
+ *
+ * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
+ * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA 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 OCRYPTO_SC_P224_H
+#define OCRYPTO_SC_P224_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**@cond */
+
+// P-224 scalar modulo group order
+typedef struct {
+    uint32_t w[7]; // little endian
+} ocrypto_sc_p224;
+
+
+// modulo P-224 number
+typedef struct {
+  uint32_t w[7]; // little endian
+} ocrypto_mod_p224;
+/**@endcond */
+
+// scalar to 28 byte value
+void ocrypto_sc_p224_to28bytes(uint8_t r[28], const ocrypto_sc_p224 *x);
+
+// 28 byte value to scalar
+// return 0 if x < group order
+int ocrypto_sc_p224_from28bytes(ocrypto_sc_p224 *r, const uint8_t x[28]);
+
+// reduce 36 bytes to range 0 < r < group order
+void ocrypto_sc_p224_from36bytes(ocrypto_sc_p224 *r, const uint8_t x[36]);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* #ifndef OCRYPTO_SC_P224_H */