diff options
Diffstat (limited to 'repackaged_platform/bcprov/src/main/java/com/android/internal/org/bouncycastle/math/ec/custom/sec/SecP256K1Field.java')
| -rw-r--r-- | repackaged_platform/bcprov/src/main/java/com/android/internal/org/bouncycastle/math/ec/custom/sec/SecP256K1Field.java | 222 |
1 files changed, 222 insertions, 0 deletions
diff --git a/repackaged_platform/bcprov/src/main/java/com/android/internal/org/bouncycastle/math/ec/custom/sec/SecP256K1Field.java b/repackaged_platform/bcprov/src/main/java/com/android/internal/org/bouncycastle/math/ec/custom/sec/SecP256K1Field.java new file mode 100644 index 00000000..fd47d216 --- /dev/null +++ b/repackaged_platform/bcprov/src/main/java/com/android/internal/org/bouncycastle/math/ec/custom/sec/SecP256K1Field.java @@ -0,0 +1,222 @@ +/* GENERATED SOURCE. DO NOT MODIFY. */ +package com.android.internal.org.bouncycastle.math.ec.custom.sec; + +import java.math.BigInteger; +import java.security.SecureRandom; + +import com.android.internal.org.bouncycastle.math.raw.Mod; +import com.android.internal.org.bouncycastle.math.raw.Nat; +import com.android.internal.org.bouncycastle.math.raw.Nat256; +import com.android.internal.org.bouncycastle.util.Pack; + +/** + * @hide This class is not part of the Android public SDK API + */ +public class SecP256K1Field +{ + // 2^256 - 2^32 - 2^9 - 2^8 - 2^7 - 2^6 - 2^4 - 1 + static final int[] P = new int[]{ 0xFFFFFC2F, 0xFFFFFFFE, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, + 0xFFFFFFFF, 0xFFFFFFFF }; + private static final int[] PExt = new int[]{ 0x000E90A1, 0x000007A2, 0x00000001, 0x00000000, 0x00000000, 0x00000000, + 0x00000000, 0x00000000, 0xFFFFF85E, 0xFFFFFFFD, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, + 0xFFFFFFFF }; + private static final int[] PExtInv = new int[]{ 0xFFF16F5F, 0xFFFFF85D, 0xFFFFFFFE, 0xFFFFFFFF, 0xFFFFFFFF, + 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0x000007A1, 0x00000002 }; + private static final int P7 = 0xFFFFFFFF; + private static final int PExt15 = 0xFFFFFFFF; + private static final int PInv33 = 0x3D1; + + public static void add(int[] x, int[] y, int[] z) + { + int c = Nat256.add(x, y, z); + if (c != 0 || (z[7] == P7 && Nat256.gte(z, P))) + { + Nat.add33To(8, PInv33, z); + } + } + + public static void addExt(int[] xx, int[] yy, int[] zz) + { + int c = Nat.add(16, xx, yy, zz); + if (c != 0 || (zz[15] == PExt15 && Nat.gte(16, zz, PExt))) + { + if (Nat.addTo(PExtInv.length, PExtInv, zz) != 0) + { + Nat.incAt(16, zz, PExtInv.length); + } + } + } + + public static void addOne(int[] x, int[] z) + { + int c = Nat.inc(8, x, z); + if (c != 0 || (z[7] == P7 && Nat256.gte(z, P))) + { + Nat.add33To(8, PInv33, z); + } + } + + public static int[] fromBigInteger(BigInteger x) + { + int[] z = Nat256.fromBigInteger(x); + if (z[7] == P7 && Nat256.gte(z, P)) + { + Nat256.subFrom(P, z); + } + return z; + } + + public static void half(int[] x, int[] z) + { + if ((x[0] & 1) == 0) + { + Nat.shiftDownBit(8, x, 0, z); + } + else + { + int c = Nat256.add(x, P, z); + Nat.shiftDownBit(8, z, c); + } + } + + public static void inv(int[] x, int[] z) + { + Mod.checkedModOddInverse(P, x, z); + } + + public static int isZero(int[] x) + { + int d = 0; + for (int i = 0; i < 8; ++i) + { + d |= x[i]; + } + d = (d >>> 1) | (d & 1); + return (d - 1) >> 31; + } + + public static void multiply(int[] x, int[] y, int[] z) + { + int[] tt = Nat256.createExt(); + Nat256.mul(x, y, tt); + reduce(tt, z); + } + + public static void multiplyAddToExt(int[] x, int[] y, int[] zz) + { + int c = Nat256.mulAddTo(x, y, zz); + if (c != 0 || (zz[15] == PExt15 && Nat.gte(16, zz, PExt))) + { + if (Nat.addTo(PExtInv.length, PExtInv, zz) != 0) + { + Nat.incAt(16, zz, PExtInv.length); + } + } + } + + public static void negate(int[] x, int[] z) + { + if (0 != isZero(x)) + { + Nat256.sub(P, P, z); + } + else + { + Nat256.sub(P, x, z); + } + } + + public static void random(SecureRandom r, int[] z) + { + byte[] bb = new byte[8 * 4]; + do + { + r.nextBytes(bb); + Pack.littleEndianToInt(bb, 0, z, 0, 8); + } + while (0 == Nat.lessThan(8, z, P)); + } + + public static void randomMult(SecureRandom r, int[] z) + { + do + { + random(r, z); + } + while (0 != isZero(z)); + } + + public static void reduce(int[] xx, int[] z) + { + long cc = Nat256.mul33Add(PInv33, xx, 8, xx, 0, z, 0); + int c = Nat256.mul33DWordAdd(PInv33, cc, z, 0); + + // assert c == 0L || c == 1L; + + if (c != 0 || (z[7] == P7 && Nat256.gte(z, P))) + { + Nat.add33To(8, PInv33, z); + } + } + + public static void reduce32(int x, int[] z) + { + if ((x != 0 && Nat256.mul33WordAdd(PInv33, x, z, 0) != 0) + || (z[7] == P7 && Nat256.gte(z, P))) + { + Nat.add33To(8, PInv33, z); + } + } + + public static void square(int[] x, int[] z) + { + int[] tt = Nat256.createExt(); + Nat256.square(x, tt); + reduce(tt, z); + } + + public static void squareN(int[] x, int n, int[] z) + { +// assert n > 0; + + int[] tt = Nat256.createExt(); + Nat256.square(x, tt); + reduce(tt, z); + + while (--n > 0) + { + Nat256.square(z, tt); + reduce(tt, z); + } + } + + public static void subtract(int[] x, int[] y, int[] z) + { + int c = Nat256.sub(x, y, z); + if (c != 0) + { + Nat.sub33From(8, PInv33, z); + } + } + + public static void subtractExt(int[] xx, int[] yy, int[] zz) + { + int c = Nat.sub(16, xx, yy, zz); + if (c != 0) + { + if (Nat.subFrom(PExtInv.length, PExtInv, zz) != 0) + { + Nat.decAt(16, zz, PExtInv.length); + } + } + } + + public static void twice(int[] x, int[] z) + { + int c = Nat.shiftUpBit(8, x, 0, z); + if (c != 0 || (z[7] == P7 && Nat256.gte(z, P))) + { + Nat.add33To(8, PInv33, z); + } + } +} |