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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef CRYPTO_P224_H_ | 5 #ifndef CRYPTO_P224_H_ |
6 #define CRYPTO_P224_H_ | 6 #define CRYPTO_P224_H_ |
7 | 7 |
| 8 #include <stddef.h> |
| 9 #include <stdint.h> |
| 10 |
8 #include <string> | 11 #include <string> |
9 | 12 |
10 #include "base/basictypes.h" | |
11 #include "base/strings/string_piece.h" | 13 #include "base/strings/string_piece.h" |
12 #include "crypto/crypto_export.h" | 14 #include "crypto/crypto_export.h" |
13 | 15 |
14 namespace crypto { | 16 namespace crypto { |
15 | 17 |
16 // P224 implements an elliptic curve group, commonly known as P224 and defined | 18 // P224 implements an elliptic curve group, commonly known as P224 and defined |
17 // in FIPS 186-3, section D.2.2. | 19 // in FIPS 186-3, section D.2.2. |
18 namespace p224 { | 20 namespace p224 { |
19 | 21 |
20 // An element of the field (ℤ/pℤ) is represented with 8, 28-bit limbs in | 22 // An element of the field (ℤ/pℤ) is represented with 8, 28-bit limbs in |
21 // little endian order. | 23 // little endian order. |
22 typedef uint32 FieldElement[8]; | 24 typedef uint32_t FieldElement[8]; |
23 | 25 |
24 struct CRYPTO_EXPORT Point { | 26 struct CRYPTO_EXPORT Point { |
25 // SetFromString the value of the point from the 56 byte, external | 27 // SetFromString the value of the point from the 56 byte, external |
26 // representation. The external point representation is an (x, y) pair of a | 28 // representation. The external point representation is an (x, y) pair of a |
27 // point on the curve. Each field element is represented as a big-endian | 29 // point on the curve. Each field element is represented as a big-endian |
28 // number < p. | 30 // number < p. |
29 bool SetFromString(const base::StringPiece& in); | 31 bool SetFromString(const base::StringPiece& in); |
30 | 32 |
31 // ToString returns an external representation of the Point. | 33 // ToString returns an external representation of the Point. |
32 std::string ToString() const; | 34 std::string ToString() const; |
33 | 35 |
34 // An Point is represented in Jacobian form (x/z², y/z³). | 36 // An Point is represented in Jacobian form (x/z², y/z³). |
35 FieldElement x, y, z; | 37 FieldElement x, y, z; |
36 }; | 38 }; |
37 | 39 |
38 // kScalarBytes is the number of bytes needed to represent an element of the | 40 // kScalarBytes is the number of bytes needed to represent an element of the |
39 // P224 field. | 41 // P224 field. |
40 static const size_t kScalarBytes = 28; | 42 static const size_t kScalarBytes = 28; |
41 | 43 |
42 // ScalarMult computes *out = in*scalar where scalar is a 28-byte, big-endian | 44 // ScalarMult computes *out = in*scalar where scalar is a 28-byte, big-endian |
43 // number. | 45 // number. |
44 void CRYPTO_EXPORT ScalarMult(const Point& in, const uint8* scalar, Point* out); | 46 void CRYPTO_EXPORT ScalarMult(const Point& in, |
| 47 const uint8_t* scalar, |
| 48 Point* out); |
45 | 49 |
46 // ScalarBaseMult computes *out = g*scalar where g is the base point of the | 50 // ScalarBaseMult computes *out = g*scalar where g is the base point of the |
47 // curve and scalar is a 28-byte, big-endian number. | 51 // curve and scalar is a 28-byte, big-endian number. |
48 void CRYPTO_EXPORT ScalarBaseMult(const uint8* scalar, Point* out); | 52 void CRYPTO_EXPORT ScalarBaseMult(const uint8_t* scalar, Point* out); |
49 | 53 |
50 // Add computes *out = a+b. | 54 // Add computes *out = a+b. |
51 void CRYPTO_EXPORT Add(const Point& a, const Point& b, Point* out); | 55 void CRYPTO_EXPORT Add(const Point& a, const Point& b, Point* out); |
52 | 56 |
53 // Negate calculates out = -a; | 57 // Negate calculates out = -a; |
54 void CRYPTO_EXPORT Negate(const Point& a, Point* out); | 58 void CRYPTO_EXPORT Negate(const Point& a, Point* out); |
55 | 59 |
56 } // namespace p224 | 60 } // namespace p224 |
57 | 61 |
58 } // namespace crypto | 62 } // namespace crypto |
59 | 63 |
60 #endif // CRYPTO_P224_H_ | 64 #endif // CRYPTO_P224_H_ |
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