GOST3410KeyPairGenerator.smali

.class public Lorg/spongycastle/crypto/generators/GOST3410KeyPairGenerator;
.super Ljava/lang/Object;
.source "GOST3410KeyPairGenerator.java"

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


# instance fields
.field private param:Lorg/spongycastle/crypto/params/GOST3410KeyGenerationParameters;


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

    .prologue
    .line 20
    invoke-direct {p0}, Ljava/lang/Object;-><init>()V

    return-void
.end method


# virtual methods
.method public generateKeyPair()Lorg/spongycastle/crypto/AsymmetricCipherKeyPair;
    .registers 9

    .prologue
    .line 34
    iget-object v0, p0, Lorg/spongycastle/crypto/generators/GOST3410KeyPairGenerator;->param:Lorg/spongycastle/crypto/params/GOST3410KeyGenerationParameters;

    invoke-virtual {v0}, Lorg/spongycastle/crypto/params/GOST3410KeyGenerationParameters;->getParameters()Lorg/spongycastle/crypto/params/GOST3410Parameters;

    move-result-object v0

    .line 35
    iget-object v1, p0, Lorg/spongycastle/crypto/generators/GOST3410KeyPairGenerator;->param:Lorg/spongycastle/crypto/params/GOST3410KeyGenerationParameters;

    invoke-virtual {v1}, Lorg/spongycastle/crypto/params/GOST3410KeyGenerationParameters;->getRandom()Ljava/security/SecureRandom;

    move-result-object v1

    .line 37
    invoke-virtual {v0}, Lorg/spongycastle/crypto/params/GOST3410Parameters;->getQ()Ljava/math/BigInteger;

    move-result-object v2

    .line 38
    invoke-virtual {v0}, Lorg/spongycastle/crypto/params/GOST3410Parameters;->getP()Ljava/math/BigInteger;

    move-result-object v3

    .line 39
    invoke-virtual {v0}, Lorg/spongycastle/crypto/params/GOST3410Parameters;->getA()Ljava/math/BigInteger;

    move-result-object v4

    .line 44
    :cond_18
    new-instance v5, Ljava/math/BigInteger;

    const/16 v6, 0x100

    invoke-direct {v5, v6, v1}, Ljava/math/BigInteger;-><init>(ILjava/util/Random;)V

    .line 46
    invoke-virtual {v5}, Ljava/math/BigInteger;->signum()I

    move-result v6

    if-lez v6, :cond_18

    invoke-virtual {v5, v2}, Ljava/math/BigInteger;->compareTo(Ljava/math/BigInteger;)I

    move-result v6

    if-gez v6, :cond_18

    .line 51
    invoke-static {v5}, Lorg/spongycastle/math/ec/WNafUtil;->getNafWeight(Ljava/math/BigInteger;)I

    move-result v6

    const/16 v7, 0x40

    if-lt v6, v7, :cond_18

    .line 62
    invoke-virtual {v4, v5, v3}, Ljava/math/BigInteger;->modPow(Ljava/math/BigInteger;Ljava/math/BigInteger;)Ljava/math/BigInteger;

    move-result-object v1

    .line 64
    new-instance v2, Lorg/spongycastle/crypto/AsymmetricCipherKeyPair;

    new-instance v3, Lorg/spongycastle/crypto/params/GOST3410PublicKeyParameters;

    invoke-direct {v3, v1, v0}, Lorg/spongycastle/crypto/params/GOST3410PublicKeyParameters;-><init>(Ljava/math/BigInteger;Lorg/spongycastle/crypto/params/GOST3410Parameters;)V

    new-instance v1, Lorg/spongycastle/crypto/params/GOST3410PrivateKeyParameters;

    invoke-direct {v1, v5, v0}, Lorg/spongycastle/crypto/params/GOST3410PrivateKeyParameters;-><init>(Ljava/math/BigInteger;Lorg/spongycastle/crypto/params/GOST3410Parameters;)V

    invoke-direct {v2, v3, v1}, Lorg/spongycastle/crypto/AsymmetricCipherKeyPair;-><init>(Lorg/spongycastle/crypto/params/AsymmetricKeyParameter;Lorg/spongycastle/crypto/params/AsymmetricKeyParameter;)V

    return-object v2
.end method

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

    .prologue
    .line 28
    check-cast p1, Lorg/spongycastle/crypto/params/GOST3410KeyGenerationParameters;

    iput-object p1, p0, Lorg/spongycastle/crypto/generators/GOST3410KeyPairGenerator;->param:Lorg/spongycastle/crypto/params/GOST3410KeyGenerationParameters;

    .line 29
    return-void
.end method