ECMQVBasicAgreement.smali

.class public Lorg/spongycastle/crypto/agreement/ECMQVBasicAgreement;
.super Ljava/lang/Object;
.source "ECMQVBasicAgreement.java"

# interfaces
.implements Lorg/spongycastle/crypto/BasicAgreement;


# instance fields
.field privParams:Lorg/spongycastle/crypto/params/MQVPrivateParameters;


# direct methods
.method public constructor <init>()V
    .registers 1

    .prologue
    .line 18
    invoke-direct {p0}, Ljava/lang/Object;-><init>()V

    return-void
.end method

.method private calculateMqvAgreement(Lorg/spongycastle/crypto/params/ECDomainParameters;Lorg/spongycastle/crypto/params/ECPrivateKeyParameters;Lorg/spongycastle/crypto/params/ECPrivateKeyParameters;Lorg/spongycastle/crypto/params/ECPublicKeyParameters;Lorg/spongycastle/crypto/params/ECPublicKeyParameters;Lorg/spongycastle/crypto/params/ECPublicKeyParameters;)Lorg/spongycastle/math/ec/ECPoint;
    .registers 15

    .prologue
    .line 66
    invoke-virtual {p1}, Lorg/spongycastle/crypto/params/ECDomainParameters;->getN()Ljava/math/BigInteger;

    move-result-object v1

    .line 67
    invoke-virtual {v1}, Ljava/math/BigInteger;->bitLength()I

    move-result v0

    add-int/lit8 v0, v0, 0x1

    div-int/lit8 v2, v0, 0x2

    .line 68
    sget-object v0, Lorg/spongycastle/math/ec/ECConstants;->ONE:Ljava/math/BigInteger;

    invoke-virtual {v0, v2}, Ljava/math/BigInteger;->shiftLeft(I)Ljava/math/BigInteger;

    move-result-object v3

    .line 70
    invoke-virtual {p1}, Lorg/spongycastle/crypto/params/ECDomainParameters;->getCurve()Lorg/spongycastle/math/ec/ECCurve;

    move-result-object v4

    .line 72
    const/4 v0, 0x3

    new-array v5, v0, [Lorg/spongycastle/math/ec/ECPoint;

    const/4 v6, 0x0

    if-nez p4, :cond_9d

    .line 74
    invoke-virtual {p1}, Lorg/spongycastle/crypto/params/ECDomainParameters;->getG()Lorg/spongycastle/math/ec/ECPoint;

    move-result-object v0

    invoke-virtual {p3}, Lorg/spongycastle/crypto/params/ECPrivateKeyParameters;->getD()Ljava/math/BigInteger;

    move-result-object v7

    invoke-virtual {v0, v7}, Lorg/spongycastle/math/ec/ECPoint;->multiply(Ljava/math/BigInteger;)Lorg/spongycastle/math/ec/ECPoint;

    move-result-object v0

    :goto_28
    invoke-static {v4, v0}, Lorg/spongycastle/math/ec/ECAlgorithms;->importPoint(Lorg/spongycastle/math/ec/ECCurve;Lorg/spongycastle/math/ec/ECPoint;)Lorg/spongycastle/math/ec/ECPoint;

    move-result-object v0

    aput-object v0, v5, v6

    const/4 v0, 0x1

    .line 75
    invoke-virtual {p5}, Lorg/spongycastle/crypto/params/ECPublicKeyParameters;->getQ()Lorg/spongycastle/math/ec/ECPoint;

    move-result-object v6

    invoke-static {v4, v6}, Lorg/spongycastle/math/ec/ECAlgorithms;->importPoint(Lorg/spongycastle/math/ec/ECCurve;Lorg/spongycastle/math/ec/ECPoint;)Lorg/spongycastle/math/ec/ECPoint;

    move-result-object v6

    aput-object v6, v5, v0

    const/4 v0, 0x2

    .line 76
    invoke-virtual {p6}, Lorg/spongycastle/crypto/params/ECPublicKeyParameters;->getQ()Lorg/spongycastle/math/ec/ECPoint;

    move-result-object v6

    invoke-static {v4, v6}, Lorg/spongycastle/math/ec/ECAlgorithms;->importPoint(Lorg/spongycastle/math/ec/ECCurve;Lorg/spongycastle/math/ec/ECPoint;)Lorg/spongycastle/math/ec/ECPoint;

    move-result-object v6

    aput-object v6, v5, v0

    .line 79
    invoke-virtual {v4, v5}, Lorg/spongycastle/math/ec/ECCurve;->normalizeAll([Lorg/spongycastle/math/ec/ECPoint;)V

    .line 81
    const/4 v0, 0x0

    aget-object v0, v5, v0

    const/4 v4, 0x1

    aget-object v4, v5, v4

    const/4 v6, 0x2

    aget-object v5, v5, v6

    .line 83
    invoke-virtual {v0}, Lorg/spongycastle/math/ec/ECPoint;->getAffineXCoord()Lorg/spongycastle/math/ec/ECFieldElement;

    move-result-object v0

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

    move-result-object v0

    .line 84
    invoke-virtual {v0, v3}, Ljava/math/BigInteger;->mod(Ljava/math/BigInteger;)Ljava/math/BigInteger;

    move-result-object v0

    .line 85
    invoke-virtual {v0, v2}, Ljava/math/BigInteger;->setBit(I)Ljava/math/BigInteger;

    move-result-object v0

    .line 86
    invoke-virtual {p2}, Lorg/spongycastle/crypto/params/ECPrivateKeyParameters;->getD()Ljava/math/BigInteger;

    move-result-object v6

    invoke-virtual {v6, v0}, Ljava/math/BigInteger;->multiply(Ljava/math/BigInteger;)Ljava/math/BigInteger;

    move-result-object v0

    invoke-virtual {p3}, Lorg/spongycastle/crypto/params/ECPrivateKeyParameters;->getD()Ljava/math/BigInteger;

    move-result-object v6

    invoke-virtual {v0, v6}, Ljava/math/BigInteger;->add(Ljava/math/BigInteger;)Ljava/math/BigInteger;

    move-result-object v0

    invoke-virtual {v0, v1}, Ljava/math/BigInteger;->mod(Ljava/math/BigInteger;)Ljava/math/BigInteger;

    move-result-object v0

    .line 88
    invoke-virtual {v5}, Lorg/spongycastle/math/ec/ECPoint;->getAffineXCoord()Lorg/spongycastle/math/ec/ECFieldElement;

    move-result-object v6

    invoke-virtual {v6}, Lorg/spongycastle/math/ec/ECFieldElement;->toBigInteger()Ljava/math/BigInteger;

    move-result-object v6

    .line 89
    invoke-virtual {v6, v3}, Ljava/math/BigInteger;->mod(Ljava/math/BigInteger;)Ljava/math/BigInteger;

    move-result-object v3

    .line 90
    invoke-virtual {v3, v2}, Ljava/math/BigInteger;->setBit(I)Ljava/math/BigInteger;

    move-result-object v2

    .line 92
    invoke-virtual {p1}, Lorg/spongycastle/crypto/params/ECDomainParameters;->getH()Ljava/math/BigInteger;

    move-result-object v3

    invoke-virtual {v3, v0}, Ljava/math/BigInteger;->multiply(Ljava/math/BigInteger;)Ljava/math/BigInteger;

    move-result-object v0

    invoke-virtual {v0, v1}, Ljava/math/BigInteger;->mod(Ljava/math/BigInteger;)Ljava/math/BigInteger;

    move-result-object v0

    .line 95
    invoke-virtual {v2, v0}, Ljava/math/BigInteger;->multiply(Ljava/math/BigInteger;)Ljava/math/BigInteger;

    move-result-object v2

    invoke-virtual {v2, v1}, Ljava/math/BigInteger;->mod(Ljava/math/BigInteger;)Ljava/math/BigInteger;

    move-result-object v1

    .line 94
    invoke-static {v4, v1, v5, v0}, Lorg/spongycastle/math/ec/ECAlgorithms;->sumOfTwoMultiplies(Lorg/spongycastle/math/ec/ECPoint;Ljava/math/BigInteger;Lorg/spongycastle/math/ec/ECPoint;Ljava/math/BigInteger;)Lorg/spongycastle/math/ec/ECPoint;

    move-result-object v0

    return-object v0

    .line 74
    :cond_9d
    invoke-virtual {p4}, Lorg/spongycastle/crypto/params/ECPublicKeyParameters;->getQ()Lorg/spongycastle/math/ec/ECPoint;

    move-result-object v0

    goto :goto_28
.end method


# virtual methods
.method public calculateAgreement(Lorg/spongycastle/crypto/CipherParameters;)Ljava/math/BigInteger;
    .registers 9

    .prologue
    .line 36
    const-string v0, "org.spongycastle.ec.disable_mqv"

    invoke-static {v0}, Lorg/spongycastle/util/Properties;->isOverrideSet(Ljava/lang/String;)Z

    move-result v0

    if-eqz v0, :cond_10

    .line 38
    new-instance v0, Ljava/lang/IllegalStateException;

    const-string v1, "ECMQV explicitly disabled"

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

    throw v0

    .line 41
    :cond_10
    check-cast p1, Lorg/spongycastle/crypto/params/MQVPublicParameters;

    .line 43
    iget-object v0, p0, Lorg/spongycastle/crypto/agreement/ECMQVBasicAgreement;->privParams:Lorg/spongycastle/crypto/params/MQVPrivateParameters;

    invoke-virtual {v0}, Lorg/spongycastle/crypto/params/MQVPrivateParameters;->getStaticPrivateKey()Lorg/spongycastle/crypto/params/ECPrivateKeyParameters;

    move-result-object v2

    .line 45
    invoke-virtual {v2}, Lorg/spongycastle/crypto/params/ECPrivateKeyParameters;->getParameters()Lorg/spongycastle/crypto/params/ECDomainParameters;

    move-result-object v1

    iget-object v0, p0, Lorg/spongycastle/crypto/agreement/ECMQVBasicAgreement;->privParams:Lorg/spongycastle/crypto/params/MQVPrivateParameters;

    .line 46
    invoke-virtual {v0}, Lorg/spongycastle/crypto/params/MQVPrivateParameters;->getEphemeralPrivateKey()Lorg/spongycastle/crypto/params/ECPrivateKeyParameters;

    move-result-object v3

    iget-object v0, p0, Lorg/spongycastle/crypto/agreement/ECMQVBasicAgreement;->privParams:Lorg/spongycastle/crypto/params/MQVPrivateParameters;

    invoke-virtual {v0}, Lorg/spongycastle/crypto/params/MQVPrivateParameters;->getEphemeralPublicKey()Lorg/spongycastle/crypto/params/ECPublicKeyParameters;

    move-result-object v4

    .line 47
    invoke-virtual {p1}, Lorg/spongycastle/crypto/params/MQVPublicParameters;->getStaticPublicKey()Lorg/spongycastle/crypto/params/ECPublicKeyParameters;

    move-result-object v5

    invoke-virtual {p1}, Lorg/spongycastle/crypto/params/MQVPublicParameters;->getEphemeralPublicKey()Lorg/spongycastle/crypto/params/ECPublicKeyParameters;

    move-result-object v6

    move-object v0, p0

    .line 45
    invoke-direct/range {v0 .. v6}, Lorg/spongycastle/crypto/agreement/ECMQVBasicAgreement;->calculateMqvAgreement(Lorg/spongycastle/crypto/params/ECDomainParameters;Lorg/spongycastle/crypto/params/ECPrivateKeyParameters;Lorg/spongycastle/crypto/params/ECPrivateKeyParameters;Lorg/spongycastle/crypto/params/ECPublicKeyParameters;Lorg/spongycastle/crypto/params/ECPublicKeyParameters;Lorg/spongycastle/crypto/params/ECPublicKeyParameters;)Lorg/spongycastle/math/ec/ECPoint;

    move-result-object v0

    .line 47
    invoke-virtual {v0}, Lorg/spongycastle/math/ec/ECPoint;->normalize()Lorg/spongycastle/math/ec/ECPoint;

    move-result-object v0

    .line 49
    invoke-virtual {v0}, Lorg/spongycastle/math/ec/ECPoint;->isInfinity()Z

    move-result v1

    if-eqz v1, :cond_47

    .line 51
    new-instance v0, Ljava/lang/IllegalStateException;

    const-string v1, "Infinity is not a valid agreement value for MQV"

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

    throw v0

    .line 54
    :cond_47
    invoke-virtual {v0}, Lorg/spongycastle/math/ec/ECPoint;->getAffineXCoord()Lorg/spongycastle/math/ec/ECFieldElement;

    move-result-object v0

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

    move-result-object v0

    return-object v0
.end method

.method public getFieldSize()I
    .registers 2

    .prologue
    .line 31
    iget-object v0, p0, Lorg/spongycastle/crypto/agreement/ECMQVBasicAgreement;->privParams:Lorg/spongycastle/crypto/params/MQVPrivateParameters;

    invoke-virtual {v0}, Lorg/spongycastle/crypto/params/MQVPrivateParameters;->getStaticPrivateKey()Lorg/spongycastle/crypto/params/ECPrivateKeyParameters;

    move-result-object v0

    invoke-virtual {v0}, Lorg/spongycastle/crypto/params/ECPrivateKeyParameters;->getParameters()Lorg/spongycastle/crypto/params/ECDomainParameters;

    move-result-object v0

    invoke-virtual {v0}, Lorg/spongycastle/crypto/params/ECDomainParameters;->getCurve()Lorg/spongycastle/math/ec/ECCurve;

    move-result-object v0

    invoke-virtual {v0}, Lorg/spongycastle/math/ec/ECCurve;->getFieldSize()I

    move-result v0

    add-int/lit8 v0, v0, 0x7

    div-int/lit8 v0, v0, 0x8

    return v0
.end method

.method public init(Lorg/spongycastle/crypto/CipherParameters;)V
    .registers 2

    .prologue
    .line 26
    check-cast p1, Lorg/spongycastle/crypto/params/MQVPrivateParameters;

    iput-object p1, p0, Lorg/spongycastle/crypto/agreement/ECMQVBasicAgreement;->privParams:Lorg/spongycastle/crypto/params/MQVPrivateParameters;

    .line 27
    return-void
.end method