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crypto/p224.h

Index: crypto/p224.h
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+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CRYPTO_P224_H_
+#define CRYPTO_P224_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/strings/string_piece.h"
+#include "crypto/crypto_export.h"
+
+namespace crypto {
+
+// P224 implements an elliptic curve group, commonly known as P224 and defined
+// in FIPS 186-3, section D.2.2.
+namespace p224 {
+
+// An element of the field (ℤ/pℤ) is represented with 8, 28-bit limbs in
+// little endian order.
+typedef uint32 FieldElement[8];
+
+struct CRYPTO_EXPORT Point {
+  // SetFromString the value of the point from the 56 byte, external
+  // representation. The external point representation is an (x, y) pair of a
+  // point on the curve. Each field element is represented as a big-endian
+  // number < p.
+  bool SetFromString(const base::StringPiece& in);
+
+  // ToString returns an external representation of the Point.
+  std::string ToString() const;
+
+  // An Point is represented in Jacobian form (x/z², y/z³).
+  FieldElement x, y, z;
+};
+
+// kScalarBytes is the number of bytes needed to represent an element of the
+// P224 field.
+static const size_t kScalarBytes = 28;
+
+// ScalarMult computes *out = in*scalar where scalar is a 28-byte, big-endian
+// number.
+void CRYPTO_EXPORT ScalarMult(const Point& in, const uint8* scalar, Point* out);
+
+// ScalarBaseMult computes *out = g*scalar where g is the base point of the
+// curve and scalar is a 28-byte, big-endian number.
+void CRYPTO_EXPORT ScalarBaseMult(const uint8* scalar, Point* out);
+
+// Add computes *out = a+b.
+void CRYPTO_EXPORT Add(const Point& a, const Point& b, Point* out);
+
+// Negate calculates out = -a;
+void CRYPTO_EXPORT Negate(const Point& a, Point* out);
+
+}  // namespace p224
+
+}  // namespace crypto
+
+#endif  // CRYPTO_P224_H_