ECCurve$AbstractF2m.smali

.class public abstract Lorg/spongycastle/math/ec/ECCurve$AbstractF2m;
.super Lorg/spongycastle/math/ec/ECCurve;
.source "ECCurve.java"


# instance fields
.field private si:[Ljava/math/BigInteger;


# direct methods
.method protected constructor <init>(IIII)V
    .registers 6

    .prologue
    .line 703
    invoke-static {p1, p2, p3, p4}, Lorg/spongycastle/math/ec/ECCurve$AbstractF2m;->buildField(IIII)Lorg/spongycastle/math/field/FiniteField;

    move-result-object v0

    invoke-direct {p0, v0}, Lorg/spongycastle/math/ec/ECCurve;-><init>(Lorg/spongycastle/math/field/FiniteField;)V

    .line 669
    const/4 v0, 0x0

    iput-object v0, p0, Lorg/spongycastle/math/ec/ECCurve$AbstractF2m;->si:[Ljava/math/BigInteger;

    .line 704
    return-void
.end method

.method private static buildField(IIII)Lorg/spongycastle/math/field/FiniteField;
    .registers 9

    .prologue
    const/4 v4, 0x3

    const/4 v3, 0x2

    const/4 v2, 0x1

    const/4 v1, 0x0

    .line 673
    if-nez p1, :cond_e

    .line 675
    new-instance v0, Ljava/lang/IllegalArgumentException;

    const-string v1, "k1 must be > 0"

    invoke-direct {v0, v1}, Ljava/lang/IllegalArgumentException;-><init>(Ljava/lang/String;)V

    throw v0

    .line 678
    :cond_e
    if-nez p2, :cond_27

    .line 680
    if-eqz p3, :cond_1a

    .line 682
    new-instance v0, Ljava/lang/IllegalArgumentException;

    const-string v1, "k3 must be 0 if k2 == 0"

    invoke-direct {v0, v1}, Ljava/lang/IllegalArgumentException;-><init>(Ljava/lang/String;)V

    throw v0

    .line 685
    :cond_1a
    new-array v0, v4, [I

    aput v1, v0, v1

    aput p1, v0, v2

    aput p0, v0, v3

    invoke-static {v0}, Lorg/spongycastle/math/field/FiniteFields;->getBinaryExtensionField([I)Lorg/spongycastle/math/field/PolynomialExtensionField;

    move-result-object v0

    .line 698
    :goto_26
    return-object v0

    .line 688
    :cond_27
    if-gt p2, p1, :cond_31

    .line 690
    new-instance v0, Ljava/lang/IllegalArgumentException;

    const-string v1, "k2 must be > k1"

    invoke-direct {v0, v1}, Ljava/lang/IllegalArgumentException;-><init>(Ljava/lang/String;)V

    throw v0

    .line 693
    :cond_31
    if-gt p3, p2, :cond_3b

    .line 695
    new-instance v0, Ljava/lang/IllegalArgumentException;

    const-string v1, "k3 must be > k2"

    invoke-direct {v0, v1}, Ljava/lang/IllegalArgumentException;-><init>(Ljava/lang/String;)V

    throw v0

    .line 698
    :cond_3b
    const/4 v0, 0x5

    new-array v0, v0, [I

    aput v1, v0, v1

    aput p1, v0, v2

    aput p2, v0, v3

    aput p3, v0, v4

    const/4 v1, 0x4

    aput p0, v0, v1

    invoke-static {v0}, Lorg/spongycastle/math/field/FiniteFields;->getBinaryExtensionField([I)Lorg/spongycastle/math/field/PolynomialExtensionField;

    move-result-object v0

    goto :goto_26
.end method

.method public static inverse(I[ILjava/math/BigInteger;)Ljava/math/BigInteger;
    .registers 4

    .prologue
    .line 661
    new-instance v0, Lorg/spongycastle/math/ec/LongArray;

    invoke-direct {v0, p2}, Lorg/spongycastle/math/ec/LongArray;-><init>(Ljava/math/BigInteger;)V

    invoke-virtual {v0, p0, p1}, Lorg/spongycastle/math/ec/LongArray;->modInverse(I[I)Lorg/spongycastle/math/ec/LongArray;

    move-result-object v0

    invoke-virtual {v0}, Lorg/spongycastle/math/ec/LongArray;->toBigInteger()Ljava/math/BigInteger;

    move-result-object v0

    return-object v0
.end method

.method private solveQuadraticEquation(Lorg/spongycastle/math/ec/ECFieldElement;)Lorg/spongycastle/math/ec/ECFieldElement;
    .registers 10

    .prologue
    .line 819
    invoke-virtual {p1}, Lorg/spongycastle/math/ec/ECFieldElement;->isZero()Z

    move-result v0

    if-eqz v0, :cond_7

    .line 847
    :goto_6
    return-object p1

    .line 824
    :cond_7
    sget-object v0, Lorg/spongycastle/math/ec/ECConstants;->ZERO:Ljava/math/BigInteger;

    invoke-virtual {p0, v0}, Lorg/spongycastle/math/ec/ECCurve$AbstractF2m;->fromBigInteger(Ljava/math/BigInteger;)Lorg/spongycastle/math/ec/ECFieldElement;

    move-result-object v3

    .line 826
    invoke-virtual {p0}, Lorg/spongycastle/math/ec/ECCurve$AbstractF2m;->getFieldSize()I

    move-result v5

    .line 827
    new-instance v6, Ljava/util/Random;

    invoke-direct {v6}, Ljava/util/Random;-><init>()V

    .line 830
    :cond_16
    new-instance v0, Ljava/math/BigInteger;

    invoke-direct {v0, v5, v6}, Ljava/math/BigInteger;-><init>(ILjava/util/Random;)V

    invoke-virtual {p0, v0}, Lorg/spongycastle/math/ec/ECCurve$AbstractF2m;->fromBigInteger(Ljava/math/BigInteger;)Lorg/spongycastle/math/ec/ECFieldElement;

    move-result-object v7

    .line 833
    const/4 v0, 0x1

    move v1, v0

    move-object v2, p1

    move-object v0, v3

    :goto_23
    if-ge v1, v5, :cond_3e

    .line 835
    invoke-virtual {v2}, Lorg/spongycastle/math/ec/ECFieldElement;->square()Lorg/spongycastle/math/ec/ECFieldElement;

    move-result-object v2

    .line 836
    invoke-virtual {v0}, Lorg/spongycastle/math/ec/ECFieldElement;->square()Lorg/spongycastle/math/ec/ECFieldElement;

    move-result-object v0

    invoke-virtual {v2, v7}, Lorg/spongycastle/math/ec/ECFieldElement;->multiply(Lorg/spongycastle/math/ec/ECFieldElement;)Lorg/spongycastle/math/ec/ECFieldElement;

    move-result-object v4

    invoke-virtual {v0, v4}, Lorg/spongycastle/math/ec/ECFieldElement;->add(Lorg/spongycastle/math/ec/ECFieldElement;)Lorg/spongycastle/math/ec/ECFieldElement;

    move-result-object v4

    .line 837
    invoke-virtual {v2, p1}, Lorg/spongycastle/math/ec/ECFieldElement;->add(Lorg/spongycastle/math/ec/ECFieldElement;)Lorg/spongycastle/math/ec/ECFieldElement;

    move-result-object v2

    .line 833
    add-int/lit8 v0, v1, 0x1

    move v1, v0

    move-object v0, v4

    goto :goto_23

    .line 839
    :cond_3e
    invoke-virtual {v2}, Lorg/spongycastle/math/ec/ECFieldElement;->isZero()Z

    move-result v1

    if-nez v1, :cond_46

    .line 841
    const/4 p1, 0x0

    goto :goto_6

    .line 843
    :cond_46
    invoke-virtual {v0}, Lorg/spongycastle/math/ec/ECFieldElement;->square()Lorg/spongycastle/math/ec/ECFieldElement;

    move-result-object v1

    invoke-virtual {v1, v0}, Lorg/spongycastle/math/ec/ECFieldElement;->add(Lorg/spongycastle/math/ec/ECFieldElement;)Lorg/spongycastle/math/ec/ECFieldElement;

    move-result-object v1

    .line 845
    invoke-virtual {v1}, Lorg/spongycastle/math/ec/ECFieldElement;->isZero()Z

    move-result v1

    if-nez v1, :cond_16

    move-object p1, v0

    .line 847
    goto :goto_6
.end method


# virtual methods
.method public createPoint(Ljava/math/BigInteger;Ljava/math/BigInteger;Z)Lorg/spongycastle/math/ec/ECPoint;
    .registers 8

    .prologue
    .line 713
    invoke-virtual {p0, p1}, Lorg/spongycastle/math/ec/ECCurve$AbstractF2m;->fromBigInteger(Ljava/math/BigInteger;)Lorg/spongycastle/math/ec/ECFieldElement;

    move-result-object v1

    invoke-virtual {p0, p2}, Lorg/spongycastle/math/ec/ECCurve$AbstractF2m;->fromBigInteger(Ljava/math/BigInteger;)Lorg/spongycastle/math/ec/ECFieldElement;

    move-result-object v0

    .line 715
    invoke-virtual {p0}, Lorg/spongycastle/math/ec/ECCurve$AbstractF2m;->getCoordinateSystem()I

    move-result v2

    .line 717
    packed-switch v2, :pswitch_data_38

    .line 753
    :cond_f
    :goto_f
    invoke-virtual {p0, v1, v0, p3}, Lorg/spongycastle/math/ec/ECCurve$AbstractF2m;->createRawPoint(Lorg/spongycastle/math/ec/ECFieldElement;Lorg/spongycastle/math/ec/ECFieldElement;Z)Lorg/spongycastle/math/ec/ECPoint;

    move-result-object v0

    return-object v0

    .line 722
    :pswitch_14
    invoke-virtual {v1}, Lorg/spongycastle/math/ec/ECFieldElement;->isZero()Z

    move-result v2

    if-eqz v2, :cond_2e

    .line 724
    invoke-virtual {v0}, Lorg/spongycastle/math/ec/ECFieldElement;->square()Lorg/spongycastle/math/ec/ECFieldElement;

    move-result-object v2

    invoke-virtual {p0}, Lorg/spongycastle/math/ec/ECCurve$AbstractF2m;->getB()Lorg/spongycastle/math/ec/ECFieldElement;

    move-result-object v3

    invoke-virtual {v2, v3}, Ljava/lang/Object;->equals(Ljava/lang/Object;)Z

    move-result v2

    if-nez v2, :cond_f

    .line 726
    new-instance v0, Ljava/lang/IllegalArgumentException;

    invoke-direct {v0}, Ljava/lang/IllegalArgumentException;-><init>()V

    throw v0

    .line 743
    :cond_2e
    invoke-virtual {v0, v1}, Lorg/spongycastle/math/ec/ECFieldElement;->divide(Lorg/spongycastle/math/ec/ECFieldElement;)Lorg/spongycastle/math/ec/ECFieldElement;

    move-result-object v0

    invoke-virtual {v0, v1}, Lorg/spongycastle/math/ec/ECFieldElement;->add(Lorg/spongycastle/math/ec/ECFieldElement;)Lorg/spongycastle/math/ec/ECFieldElement;

    move-result-object v0

    goto :goto_f

    .line 717
    nop

    :pswitch_data_38
    .packed-switch 0x5
        :pswitch_14
        :pswitch_14
    .end packed-switch
.end method

.method protected decompressPoint(ILjava/math/BigInteger;)Lorg/spongycastle/math/ec/ECPoint;
    .registers 8

    .prologue
    const/4 v2, 0x1

    .line 767
    invoke-virtual {p0, p2}, Lorg/spongycastle/math/ec/ECCurve$AbstractF2m;->fromBigInteger(Ljava/math/BigInteger;)Lorg/spongycastle/math/ec/ECFieldElement;

    move-result-object v3

    const/4 v1, 0x0

    .line 768
    invoke-virtual {v3}, Lorg/spongycastle/math/ec/ECFieldElement;->isZero()Z

    move-result v0

    if-eqz v0, :cond_1e

    .line 770
    invoke-virtual {p0}, Lorg/spongycastle/math/ec/ECCurve$AbstractF2m;->getB()Lorg/spongycastle/math/ec/ECFieldElement;

    move-result-object v0

    invoke-virtual {v0}, Lorg/spongycastle/math/ec/ECFieldElement;->sqrt()Lorg/spongycastle/math/ec/ECFieldElement;

    move-result-object v0

    .line 800
    :goto_14
    if-nez v0, :cond_60

    .line 802
    new-instance v0, Ljava/lang/IllegalArgumentException;

    const-string v1, "Invalid point compression"

    invoke-direct {v0, v1}, Ljava/lang/IllegalArgumentException;-><init>(Ljava/lang/String;)V

    throw v0

    .line 774
    :cond_1e
    invoke-virtual {v3}, Lorg/spongycastle/math/ec/ECFieldElement;->square()Lorg/spongycastle/math/ec/ECFieldElement;

    move-result-object v0

    invoke-virtual {v0}, Lorg/spongycastle/math/ec/ECFieldElement;->invert()Lorg/spongycastle/math/ec/ECFieldElement;

    move-result-object v0

    invoke-virtual {p0}, Lorg/spongycastle/math/ec/ECCurve$AbstractF2m;->getB()Lorg/spongycastle/math/ec/ECFieldElement;

    move-result-object v4

    invoke-virtual {v0, v4}, Lorg/spongycastle/math/ec/ECFieldElement;->multiply(Lorg/spongycastle/math/ec/ECFieldElement;)Lorg/spongycastle/math/ec/ECFieldElement;

    move-result-object v0

    invoke-virtual {p0}, Lorg/spongycastle/math/ec/ECCurve$AbstractF2m;->getA()Lorg/spongycastle/math/ec/ECFieldElement;

    move-result-object v4

    invoke-virtual {v0, v4}, Lorg/spongycastle/math/ec/ECFieldElement;->add(Lorg/spongycastle/math/ec/ECFieldElement;)Lorg/spongycastle/math/ec/ECFieldElement;

    move-result-object v0

    invoke-virtual {v0, v3}, Lorg/spongycastle/math/ec/ECFieldElement;->add(Lorg/spongycastle/math/ec/ECFieldElement;)Lorg/spongycastle/math/ec/ECFieldElement;

    move-result-object v0

    .line 775
    invoke-direct {p0, v0}, Lorg/spongycastle/math/ec/ECCurve$AbstractF2m;->solveQuadraticEquation(Lorg/spongycastle/math/ec/ECFieldElement;)Lorg/spongycastle/math/ec/ECFieldElement;

    move-result-object v0

    .line 776
    if-eqz v0, :cond_65

    .line 778
    invoke-virtual {v0}, Lorg/spongycastle/math/ec/ECFieldElement;->testBitZero()Z

    move-result v4

    if-ne p1, v2, :cond_59

    move v1, v2

    :goto_47
    if-eq v4, v1, :cond_4d

    .line 780
    invoke-virtual {v0}, Lorg/spongycastle/math/ec/ECFieldElement;->addOne()Lorg/spongycastle/math/ec/ECFieldElement;

    move-result-object v0

    .line 783
    :cond_4d
    invoke-virtual {p0}, Lorg/spongycastle/math/ec/ECCurve$AbstractF2m;->getCoordinateSystem()I

    move-result v1

    packed-switch v1, :pswitch_data_68

    .line 793
    invoke-virtual {v0, v3}, Lorg/spongycastle/math/ec/ECFieldElement;->multiply(Lorg/spongycastle/math/ec/ECFieldElement;)Lorg/spongycastle/math/ec/ECFieldElement;

    move-result-object v0

    goto :goto_14

    .line 778
    :cond_59
    const/4 v1, 0x0

    goto :goto_47

    .line 788
    :pswitch_5b
    invoke-virtual {v0, v3}, Lorg/spongycastle/math/ec/ECFieldElement;->add(Lorg/spongycastle/math/ec/ECFieldElement;)Lorg/spongycastle/math/ec/ECFieldElement;

    move-result-object v0

    goto :goto_14

    .line 805
    :cond_60
    invoke-virtual {p0, v3, v0, v2}, Lorg/spongycastle/math/ec/ECCurve$AbstractF2m;->createRawPoint(Lorg/spongycastle/math/ec/ECFieldElement;Lorg/spongycastle/math/ec/ECFieldElement;Z)Lorg/spongycastle/math/ec/ECPoint;

    move-result-object v0

    return-object v0

    :cond_65
    move-object v0, v1

    goto :goto_14

    .line 783
    nop

    :pswitch_data_68
    .packed-switch 0x5
        :pswitch_5b
        :pswitch_5b
    .end packed-switch
.end method

.method declared-synchronized getSi()[Ljava/math/BigInteger;
    .registers 2

    .prologue
    .line 857
    monitor-enter p0

    :try_start_1
    iget-object v0, p0, Lorg/spongycastle/math/ec/ECCurve$AbstractF2m;->si:[Ljava/math/BigInteger;

    if-nez v0, :cond_b

    .line 859
    invoke-static {p0}, Lorg/spongycastle/math/ec/Tnaf;->getSi(Lorg/spongycastle/math/ec/ECCurve$AbstractF2m;)[Ljava/math/BigInteger;

    move-result-object v0

    iput-object v0, p0, Lorg/spongycastle/math/ec/ECCurve$AbstractF2m;->si:[Ljava/math/BigInteger;

    .line 861
    :cond_b
    iget-object v0, p0, Lorg/spongycastle/math/ec/ECCurve$AbstractF2m;->si:[Ljava/math/BigInteger;
    :try_end_d
    .catchall {:try_start_1 .. :try_end_d} :catchall_f

    monitor-exit p0

    return-object v0

    .line 857
    :catchall_f
    move-exception v0

    monitor-exit p0

    throw v0
.end method

.method public isKoblitz()Z
    .registers 2

    .prologue
    .line 870
    iget-object v0, p0, Lorg/spongycastle/math/ec/ECCurve$AbstractF2m;->order:Ljava/math/BigInteger;

    if-eqz v0, :cond_22

    iget-object v0, p0, Lorg/spongycastle/math/ec/ECCurve$AbstractF2m;->cofactor:Ljava/math/BigInteger;

    if-eqz v0, :cond_22

    iget-object v0, p0, Lorg/spongycastle/math/ec/ECCurve$AbstractF2m;->b:Lorg/spongycastle/math/ec/ECFieldElement;

    invoke-virtual {v0}, Lorg/spongycastle/math/ec/ECFieldElement;->isOne()Z

    move-result v0

    if-eqz v0, :cond_22

    iget-object v0, p0, Lorg/spongycastle/math/ec/ECCurve$AbstractF2m;->a:Lorg/spongycastle/math/ec/ECFieldElement;

    invoke-virtual {v0}, Lorg/spongycastle/math/ec/ECFieldElement;->isZero()Z

    move-result v0

    if-nez v0, :cond_20

    iget-object v0, p0, Lorg/spongycastle/math/ec/ECCurve$AbstractF2m;->a:Lorg/spongycastle/math/ec/ECFieldElement;

    invoke-virtual {v0}, Lorg/spongycastle/math/ec/ECFieldElement;->isOne()Z

    move-result v0

    if-eqz v0, :cond_22

    :cond_20
    const/4 v0, 0x1

    :goto_21
    return v0

    :cond_22
    const/4 v0, 0x0

    goto :goto_21
.end method

.method public isValidFieldElement(Ljava/math/BigInteger;)Z
    .registers 4

    .prologue
    .line 708
    if-eqz p1, :cond_14

    invoke-virtual {p1}, Ljava/math/BigInteger;->signum()I

    move-result v0

    if-ltz v0, :cond_14

    invoke-virtual {p1}, Ljava/math/BigInteger;->bitLength()I

    move-result v0

    invoke-virtual {p0}, Lorg/spongycastle/math/ec/ECCurve$AbstractF2m;->getFieldSize()I

    move-result v1

    if-gt v0, v1, :cond_14

    const/4 v0, 0x1

    :goto_13
    return v0

    :cond_14
    const/4 v0, 0x0

    goto :goto_13
.end method