ECGOST3410Signer.smali

.class public Lorg/spongycastle/crypto/signers/ECGOST3410Signer;
.super Ljava/lang/Object;
.source "ECGOST3410Signer.java"

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


# instance fields
.field key:Lorg/spongycastle/crypto/params/ECKeyParameters;

.field random:Ljava/security/SecureRandom;


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

    .prologue
    .line 22
    invoke-direct {p0}, Ljava/lang/Object;-><init>()V

    return-void
.end method


# virtual methods
.method protected createBasePointMultiplier()Lorg/spongycastle/math/ec/ECMultiplier;
    .registers 2

    .prologue
    .line 158
    new-instance v0, Lorg/spongycastle/math/ec/FixedPointCombMultiplier;

    invoke-direct {v0}, Lorg/spongycastle/math/ec/FixedPointCombMultiplier;-><init>()V

    return-object v0
.end method

.method public generateSignature([B)[Ljava/math/BigInteger;
    .registers 12

    .prologue
    const/4 v9, 0x1

    const/4 v1, 0x0

    .line 64
    array-length v0, p1

    new-array v2, v0, [B

    move v0, v1

    .line 65
    :goto_6
    array-length v3, v2

    if-eq v0, v3, :cond_14

    .line 67
    array-length v3, v2

    add-int/lit8 v3, v3, -0x1

    sub-int/2addr v3, v0

    aget-byte v3, p1, v3

    aput-byte v3, v2, v0

    .line 65
    add-int/lit8 v0, v0, 0x1

    goto :goto_6

    .line 70
    :cond_14
    new-instance v3, Ljava/math/BigInteger;

    invoke-direct {v3, v9, v2}, Ljava/math/BigInteger;-><init>(I[B)V

    .line 72
    iget-object v0, p0, Lorg/spongycastle/crypto/signers/ECGOST3410Signer;->key:Lorg/spongycastle/crypto/params/ECKeyParameters;

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

    move-result-object v2

    .line 73
    invoke-virtual {v2}, Lorg/spongycastle/crypto/params/ECDomainParameters;->getN()Ljava/math/BigInteger;

    move-result-object v4

    .line 74
    iget-object v0, p0, Lorg/spongycastle/crypto/signers/ECGOST3410Signer;->key:Lorg/spongycastle/crypto/params/ECKeyParameters;

    check-cast v0, Lorg/spongycastle/crypto/params/ECPrivateKeyParameters;

    invoke-virtual {v0}, Lorg/spongycastle/crypto/params/ECPrivateKeyParameters;->getD()Ljava/math/BigInteger;

    move-result-object v0

    .line 78
    invoke-virtual {p0}, Lorg/spongycastle/crypto/signers/ECGOST3410Signer;->createBasePointMultiplier()Lorg/spongycastle/math/ec/ECMultiplier;

    move-result-object v5

    .line 87
    :cond_2f
    new-instance v6, Ljava/math/BigInteger;

    invoke-virtual {v4}, Ljava/math/BigInteger;->bitLength()I

    move-result v7

    iget-object v8, p0, Lorg/spongycastle/crypto/signers/ECGOST3410Signer;->random:Ljava/security/SecureRandom;

    invoke-direct {v6, v7, v8}, Ljava/math/BigInteger;-><init>(ILjava/util/Random;)V

    .line 89
    sget-object v7, Lorg/spongycastle/math/ec/ECConstants;->ZERO:Ljava/math/BigInteger;

    invoke-virtual {v6, v7}, Ljava/math/BigInteger;->equals(Ljava/lang/Object;)Z

    move-result v7

    if-nez v7, :cond_2f

    .line 91
    invoke-virtual {v2}, Lorg/spongycastle/crypto/params/ECDomainParameters;->getG()Lorg/spongycastle/math/ec/ECPoint;

    move-result-object v7

    invoke-interface {v5, v7, v6}, Lorg/spongycastle/math/ec/ECMultiplier;->multiply(Lorg/spongycastle/math/ec/ECPoint;Ljava/math/BigInteger;)Lorg/spongycastle/math/ec/ECPoint;

    move-result-object v7

    invoke-virtual {v7}, Lorg/spongycastle/math/ec/ECPoint;->normalize()Lorg/spongycastle/math/ec/ECPoint;

    move-result-object v7

    .line 93
    invoke-virtual {v7}, Lorg/spongycastle/math/ec/ECPoint;->getAffineXCoord()Lorg/spongycastle/math/ec/ECFieldElement;

    move-result-object v7

    invoke-virtual {v7}, Lorg/spongycastle/math/ec/ECFieldElement;->toBigInteger()Ljava/math/BigInteger;

    move-result-object v7

    invoke-virtual {v7, v4}, Ljava/math/BigInteger;->mod(Ljava/math/BigInteger;)Ljava/math/BigInteger;

    move-result-object v7

    .line 95
    sget-object v8, Lorg/spongycastle/math/ec/ECConstants;->ZERO:Ljava/math/BigInteger;

    invoke-virtual {v7, v8}, Ljava/math/BigInteger;->equals(Ljava/lang/Object;)Z

    move-result v8

    if-nez v8, :cond_2f

    .line 97
    invoke-virtual {v6, v3}, Ljava/math/BigInteger;->multiply(Ljava/math/BigInteger;)Ljava/math/BigInteger;

    move-result-object v6

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

    move-result-object v8

    invoke-virtual {v6, v8}, Ljava/math/BigInteger;->add(Ljava/math/BigInteger;)Ljava/math/BigInteger;

    move-result-object v6

    invoke-virtual {v6, v4}, Ljava/math/BigInteger;->mod(Ljava/math/BigInteger;)Ljava/math/BigInteger;

    move-result-object v6

    .line 99
    sget-object v8, Lorg/spongycastle/math/ec/ECConstants;->ZERO:Ljava/math/BigInteger;

    invoke-virtual {v6, v8}, Ljava/math/BigInteger;->equals(Ljava/lang/Object;)Z

    move-result v8

    if-nez v8, :cond_2f

    .line 101
    const/4 v0, 0x2

    new-array v0, v0, [Ljava/math/BigInteger;

    aput-object v7, v0, v1

    aput-object v6, v0, v9

    return-object v0
.end method

.method public init(ZLorg/spongycastle/crypto/CipherParameters;)V
    .registers 4

    .prologue
    .line 33
    if-eqz p1, :cond_23

    .line 35
    instance-of v0, p2, Lorg/spongycastle/crypto/params/ParametersWithRandom;

    if-eqz v0, :cond_17

    .line 37
    check-cast p2, Lorg/spongycastle/crypto/params/ParametersWithRandom;

    .line 39
    invoke-virtual {p2}, Lorg/spongycastle/crypto/params/ParametersWithRandom;->getRandom()Ljava/security/SecureRandom;

    move-result-object v0

    iput-object v0, p0, Lorg/spongycastle/crypto/signers/ECGOST3410Signer;->random:Ljava/security/SecureRandom;

    .line 40
    invoke-virtual {p2}, Lorg/spongycastle/crypto/params/ParametersWithRandom;->getParameters()Lorg/spongycastle/crypto/CipherParameters;

    move-result-object v0

    check-cast v0, Lorg/spongycastle/crypto/params/ECPrivateKeyParameters;

    iput-object v0, p0, Lorg/spongycastle/crypto/signers/ECGOST3410Signer;->key:Lorg/spongycastle/crypto/params/ECKeyParameters;

    .line 52
    :goto_16
    return-void

    .line 44
    :cond_17
    new-instance v0, Ljava/security/SecureRandom;

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

    iput-object v0, p0, Lorg/spongycastle/crypto/signers/ECGOST3410Signer;->random:Ljava/security/SecureRandom;

    .line 45
    check-cast p2, Lorg/spongycastle/crypto/params/ECPrivateKeyParameters;

    iput-object p2, p0, Lorg/spongycastle/crypto/signers/ECGOST3410Signer;->key:Lorg/spongycastle/crypto/params/ECKeyParameters;

    goto :goto_16

    .line 50
    :cond_23
    check-cast p2, Lorg/spongycastle/crypto/params/ECPublicKeyParameters;

    iput-object p2, p0, Lorg/spongycastle/crypto/signers/ECGOST3410Signer;->key:Lorg/spongycastle/crypto/params/ECKeyParameters;

    goto :goto_16
.end method

.method public verifySignature([BLjava/math/BigInteger;Ljava/math/BigInteger;)Z
    .registers 10

    .prologue
    const/4 v1, 0x0

    .line 114
    array-length v0, p1

    new-array v2, v0, [B

    move v0, v1

    .line 115
    :goto_5
    array-length v3, v2

    if-eq v0, v3, :cond_13

    .line 117
    array-length v3, v2

    add-int/lit8 v3, v3, -0x1

    sub-int/2addr v3, v0

    aget-byte v3, p1, v3

    aput-byte v3, v2, v0

    .line 115
    add-int/lit8 v0, v0, 0x1

    goto :goto_5

    .line 120
    :cond_13
    new-instance v0, Ljava/math/BigInteger;

    const/4 v3, 0x1

    invoke-direct {v0, v3, v2}, Ljava/math/BigInteger;-><init>(I[B)V

    .line 121
    iget-object v2, p0, Lorg/spongycastle/crypto/signers/ECGOST3410Signer;->key:Lorg/spongycastle/crypto/params/ECKeyParameters;

    invoke-virtual {v2}, Lorg/spongycastle/crypto/params/ECKeyParameters;->getParameters()Lorg/spongycastle/crypto/params/ECDomainParameters;

    move-result-object v2

    invoke-virtual {v2}, Lorg/spongycastle/crypto/params/ECDomainParameters;->getN()Ljava/math/BigInteger;

    move-result-object v2

    .line 124
    sget-object v3, Lorg/spongycastle/math/ec/ECConstants;->ONE:Ljava/math/BigInteger;

    invoke-virtual {p2, v3}, Ljava/math/BigInteger;->compareTo(Ljava/math/BigInteger;)I

    move-result v3

    if-ltz v3, :cond_31

    invoke-virtual {p2, v2}, Ljava/math/BigInteger;->compareTo(Ljava/math/BigInteger;)I

    move-result v3

    if-ltz v3, :cond_32

    .line 153
    :cond_31
    :goto_31
    return v1

    .line 130
    :cond_32
    sget-object v3, Lorg/spongycastle/math/ec/ECConstants;->ONE:Ljava/math/BigInteger;

    invoke-virtual {p3, v3}, Ljava/math/BigInteger;->compareTo(Ljava/math/BigInteger;)I

    move-result v3

    if-ltz v3, :cond_31

    invoke-virtual {p3, v2}, Ljava/math/BigInteger;->compareTo(Ljava/math/BigInteger;)I

    move-result v3

    if-gez v3, :cond_31

    .line 135
    invoke-virtual {v0, v2}, Ljava/math/BigInteger;->modInverse(Ljava/math/BigInteger;)Ljava/math/BigInteger;

    move-result-object v0

    .line 137
    invoke-virtual {p3, v0}, Ljava/math/BigInteger;->multiply(Ljava/math/BigInteger;)Ljava/math/BigInteger;

    move-result-object v3

    invoke-virtual {v3, v2}, Ljava/math/BigInteger;->mod(Ljava/math/BigInteger;)Ljava/math/BigInteger;

    move-result-object v3

    .line 138
    invoke-virtual {v2, p2}, Ljava/math/BigInteger;->subtract(Ljava/math/BigInteger;)Ljava/math/BigInteger;

    move-result-object v4

    invoke-virtual {v4, v0}, Ljava/math/BigInteger;->multiply(Ljava/math/BigInteger;)Ljava/math/BigInteger;

    move-result-object v0

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

    move-result-object v4

    .line 140
    iget-object v0, p0, Lorg/spongycastle/crypto/signers/ECGOST3410Signer;->key:Lorg/spongycastle/crypto/params/ECKeyParameters;

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

    move-result-object v0

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

    move-result-object v5

    .line 141
    iget-object v0, p0, Lorg/spongycastle/crypto/signers/ECGOST3410Signer;->key:Lorg/spongycastle/crypto/params/ECKeyParameters;

    check-cast v0, Lorg/spongycastle/crypto/params/ECPublicKeyParameters;

    invoke-virtual {v0}, Lorg/spongycastle/crypto/params/ECPublicKeyParameters;->getQ()Lorg/spongycastle/math/ec/ECPoint;

    move-result-object v0

    .line 143
    invoke-static {v5, v3, v0, v4}, 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

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

    move-result-object v0

    .line 146
    invoke-virtual {v0}, Lorg/spongycastle/math/ec/ECPoint;->isInfinity()Z

    move-result v3

    if-nez v3, :cond_31

    .line 151
    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

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

    move-result-object v0

    .line 153
    invoke-virtual {v0, p2}, Ljava/math/BigInteger;->equals(Ljava/lang/Object;)Z

    move-result v1

    goto :goto_31
.end method