ECIESKeyEncapsulation.smali

.class public Lorg/spongycastle/crypto/kems/ECIESKeyEncapsulation;
.super Ljava/lang/Object;
.source "ECIESKeyEncapsulation.java"

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


# static fields
.field private static final ONE:Ljava/math/BigInteger;


# instance fields
.field private CofactorMode:Z

.field private OldCofactorMode:Z

.field private SingleHashMode:Z

.field private kdf:Lorg/spongycastle/crypto/DerivationFunction;

.field private key:Lorg/spongycastle/crypto/params/ECKeyParameters;

.field private rnd:Ljava/security/SecureRandom;


# direct methods
.method static constructor <clinit>()V
    .registers 2

    .prologue
    .line 28
    const-wide/16 v0, 0x1

    invoke-static {v0, v1}, Ljava/math/BigInteger;->valueOf(J)Ljava/math/BigInteger;

    move-result-object v0

    sput-object v0, Lorg/spongycastle/crypto/kems/ECIESKeyEncapsulation;->ONE:Ljava/math/BigInteger;

    return-void
.end method

.method public constructor <init>(Lorg/spongycastle/crypto/DerivationFunction;Ljava/security/SecureRandom;)V
    .registers 4

    .prologue
    const/4 v0, 0x0

    .line 46
    invoke-direct {p0}, Ljava/lang/Object;-><init>()V

    .line 47
    iput-object p1, p0, Lorg/spongycastle/crypto/kems/ECIESKeyEncapsulation;->kdf:Lorg/spongycastle/crypto/DerivationFunction;

    .line 48
    iput-object p2, p0, Lorg/spongycastle/crypto/kems/ECIESKeyEncapsulation;->rnd:Ljava/security/SecureRandom;

    .line 49
    iput-boolean v0, p0, Lorg/spongycastle/crypto/kems/ECIESKeyEncapsulation;->CofactorMode:Z

    .line 50
    iput-boolean v0, p0, Lorg/spongycastle/crypto/kems/ECIESKeyEncapsulation;->OldCofactorMode:Z

    .line 51
    iput-boolean v0, p0, Lorg/spongycastle/crypto/kems/ECIESKeyEncapsulation;->SingleHashMode:Z

    .line 52
    return-void
.end method

.method public constructor <init>(Lorg/spongycastle/crypto/DerivationFunction;Ljava/security/SecureRandom;ZZZ)V
    .registers 6

    .prologue
    .line 69
    invoke-direct {p0}, Ljava/lang/Object;-><init>()V

    .line 70
    iput-object p1, p0, Lorg/spongycastle/crypto/kems/ECIESKeyEncapsulation;->kdf:Lorg/spongycastle/crypto/DerivationFunction;

    .line 71
    iput-object p2, p0, Lorg/spongycastle/crypto/kems/ECIESKeyEncapsulation;->rnd:Ljava/security/SecureRandom;

    .line 75
    iput-boolean p3, p0, Lorg/spongycastle/crypto/kems/ECIESKeyEncapsulation;->CofactorMode:Z

    .line 76
    iput-boolean p4, p0, Lorg/spongycastle/crypto/kems/ECIESKeyEncapsulation;->OldCofactorMode:Z

    .line 77
    iput-boolean p5, p0, Lorg/spongycastle/crypto/kems/ECIESKeyEncapsulation;->SingleHashMode:Z

    .line 78
    return-void
.end method


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

    .prologue
    .line 225
    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 decrypt([BI)Lorg/spongycastle/crypto/CipherParameters;
    .registers 5

    .prologue
    .line 220
    const/4 v0, 0x0

    array-length v1, p1

    invoke-virtual {p0, p1, v0, v1, p2}, Lorg/spongycastle/crypto/kems/ECIESKeyEncapsulation;->decrypt([BIII)Lorg/spongycastle/crypto/CipherParameters;

    move-result-object v0

    return-object v0
.end method

.method public decrypt([BIII)Lorg/spongycastle/crypto/CipherParameters;
    .registers 11

    .prologue
    .line 172
    iget-object v0, p0, Lorg/spongycastle/crypto/kems/ECIESKeyEncapsulation;->key:Lorg/spongycastle/crypto/params/ECKeyParameters;

    instance-of v0, v0, Lorg/spongycastle/crypto/params/ECPrivateKeyParameters;

    if-nez v0, :cond_e

    .line 174
    new-instance v0, Ljava/lang/IllegalArgumentException;

    const-string v1, "Private key required for encryption"

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

    throw v0

    .line 177
    :cond_e
    iget-object v0, p0, Lorg/spongycastle/crypto/kems/ECIESKeyEncapsulation;->key:Lorg/spongycastle/crypto/params/ECKeyParameters;

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

    .line 178
    invoke-virtual {v0}, Lorg/spongycastle/crypto/params/ECPrivateKeyParameters;->getParameters()Lorg/spongycastle/crypto/params/ECDomainParameters;

    move-result-object v1

    .line 179
    invoke-virtual {v1}, Lorg/spongycastle/crypto/params/ECDomainParameters;->getCurve()Lorg/spongycastle/math/ec/ECCurve;

    move-result-object v2

    .line 180
    invoke-virtual {v1}, Lorg/spongycastle/crypto/params/ECDomainParameters;->getN()Ljava/math/BigInteger;

    move-result-object v3

    .line 181
    invoke-virtual {v1}, Lorg/spongycastle/crypto/params/ECDomainParameters;->getH()Ljava/math/BigInteger;

    move-result-object v4

    .line 184
    new-array v5, p3, [B

    .line 185
    const/4 v1, 0x0

    invoke-static {p1, p2, v5, v1, p3}, Ljava/lang/System;->arraycopy(Ljava/lang/Object;ILjava/lang/Object;II)V

    .line 188
    invoke-virtual {v2, v5}, Lorg/spongycastle/math/ec/ECCurve;->decodePoint([B)Lorg/spongycastle/math/ec/ECPoint;

    move-result-object v1

    .line 192
    iget-boolean v2, p0, Lorg/spongycastle/crypto/kems/ECIESKeyEncapsulation;->CofactorMode:Z

    if-nez v2, :cond_34

    iget-boolean v2, p0, Lorg/spongycastle/crypto/kems/ECIESKeyEncapsulation;->OldCofactorMode:Z

    if-eqz v2, :cond_38

    .line 194
    :cond_34
    invoke-virtual {v1, v4}, Lorg/spongycastle/math/ec/ECPoint;->multiply(Ljava/math/BigInteger;)Lorg/spongycastle/math/ec/ECPoint;

    move-result-object v1

    .line 197
    :cond_38
    invoke-virtual {v0}, Lorg/spongycastle/crypto/params/ECPrivateKeyParameters;->getD()Ljava/math/BigInteger;

    move-result-object v0

    .line 198
    iget-boolean v2, p0, Lorg/spongycastle/crypto/kems/ECIESKeyEncapsulation;->CofactorMode:Z

    if-eqz v2, :cond_4c

    .line 200
    invoke-virtual {v4, v3}, Ljava/math/BigInteger;->modInverse(Ljava/math/BigInteger;)Ljava/math/BigInteger;

    move-result-object v2

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

    move-result-object v0

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

    move-result-object v0

    .line 203
    :cond_4c
    invoke-virtual {v1, v0}, Lorg/spongycastle/math/ec/ECPoint;->multiply(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 206
    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;->getEncoded()[B

    move-result-object v0

    .line 208
    invoke-virtual {p0, p4, v5, v0}, Lorg/spongycastle/crypto/kems/ECIESKeyEncapsulation;->deriveKey(I[B[B)Lorg/spongycastle/crypto/params/KeyParameter;

    move-result-object v0

    return-object v0
.end method

.method protected deriveKey(I[B[B)Lorg/spongycastle/crypto/params/KeyParameter;
    .registers 8

    .prologue
    const/4 v3, 0x0

    .line 230
    .line 231
    iget-boolean v0, p0, Lorg/spongycastle/crypto/kems/ECIESKeyEncapsulation;->SingleHashMode:Z

    if-eqz v0, :cond_d

    .line 233
    invoke-static {p2, p3}, Lorg/spongycastle/util/Arrays;->concatenate([B[B)[B

    move-result-object v0

    .line 234
    invoke-static {p3, v3}, Lorg/spongycastle/util/Arrays;->fill([BB)V

    move-object p3, v0

    .line 240
    :cond_d
    :try_start_d
    iget-object v0, p0, Lorg/spongycastle/crypto/kems/ECIESKeyEncapsulation;->kdf:Lorg/spongycastle/crypto/DerivationFunction;

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

    const/4 v2, 0x0

    invoke-direct {v1, p3, v2}, Lorg/spongycastle/crypto/params/KDFParameters;-><init>([B[B)V

    invoke-interface {v0, v1}, Lorg/spongycastle/crypto/DerivationFunction;->init(Lorg/spongycastle/crypto/DerivationParameters;)V

    .line 243
    new-array v0, p1, [B

    .line 244
    iget-object v1, p0, Lorg/spongycastle/crypto/kems/ECIESKeyEncapsulation;->kdf:Lorg/spongycastle/crypto/DerivationFunction;

    const/4 v2, 0x0

    invoke-interface {v1, v0, v2, p1}, Lorg/spongycastle/crypto/DerivationFunction;->generateBytes([BII)I

    .line 247
    new-instance v1, Lorg/spongycastle/crypto/params/KeyParameter;

    invoke-direct {v1, v0}, Lorg/spongycastle/crypto/params/KeyParameter;-><init>([B)V
    :try_end_25
    .catchall {:try_start_d .. :try_end_25} :catchall_29

    .line 251
    invoke-static {p3, v3}, Lorg/spongycastle/util/Arrays;->fill([BB)V

    return-object v1

    :catchall_29
    move-exception v0

    invoke-static {p3, v3}, Lorg/spongycastle/util/Arrays;->fill([BB)V

    throw v0
.end method

.method public encrypt([BI)Lorg/spongycastle/crypto/CipherParameters;
    .registers 4

    .prologue
    .line 157
    const/4 v0, 0x0

    invoke-virtual {p0, p1, v0, p2}, Lorg/spongycastle/crypto/kems/ECIESKeyEncapsulation;->encrypt([BII)Lorg/spongycastle/crypto/CipherParameters;

    move-result-object v0

    return-object v0
.end method

.method public encrypt([BII)Lorg/spongycastle/crypto/CipherParameters;
    .registers 13

    .prologue
    const/4 v8, 0x1

    const/4 v7, 0x0

    .line 109
    iget-object v0, p0, Lorg/spongycastle/crypto/kems/ECIESKeyEncapsulation;->key:Lorg/spongycastle/crypto/params/ECKeyParameters;

    instance-of v0, v0, Lorg/spongycastle/crypto/params/ECPublicKeyParameters;

    if-nez v0, :cond_10

    .line 111
    new-instance v0, Ljava/lang/IllegalArgumentException;

    const-string v1, "Public key required for encryption"

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

    throw v0

    .line 114
    :cond_10
    iget-object v0, p0, Lorg/spongycastle/crypto/kems/ECIESKeyEncapsulation;->key:Lorg/spongycastle/crypto/params/ECKeyParameters;

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

    .line 115
    invoke-virtual {v0}, Lorg/spongycastle/crypto/params/ECPublicKeyParameters;->getParameters()Lorg/spongycastle/crypto/params/ECDomainParameters;

    move-result-object v3

    .line 116
    invoke-virtual {v3}, Lorg/spongycastle/crypto/params/ECDomainParameters;->getCurve()Lorg/spongycastle/math/ec/ECCurve;

    move-result-object v4

    .line 117
    invoke-virtual {v3}, Lorg/spongycastle/crypto/params/ECDomainParameters;->getN()Ljava/math/BigInteger;

    move-result-object v1

    .line 118
    invoke-virtual {v3}, Lorg/spongycastle/crypto/params/ECDomainParameters;->getH()Ljava/math/BigInteger;

    move-result-object v5

    .line 121
    sget-object v2, Lorg/spongycastle/crypto/kems/ECIESKeyEncapsulation;->ONE:Ljava/math/BigInteger;

    iget-object v6, p0, Lorg/spongycastle/crypto/kems/ECIESKeyEncapsulation;->rnd:Ljava/security/SecureRandom;

    invoke-static {v2, v1, v6}, Lorg/spongycastle/util/BigIntegers;->createRandomInRange(Ljava/math/BigInteger;Ljava/math/BigInteger;Ljava/security/SecureRandom;)Ljava/math/BigInteger;

    move-result-object v2

    .line 124
    iget-boolean v6, p0, Lorg/spongycastle/crypto/kems/ECIESKeyEncapsulation;->CofactorMode:Z

    if-eqz v6, :cond_6f

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

    move-result-object v5

    invoke-virtual {v5, v1}, Ljava/math/BigInteger;->mod(Ljava/math/BigInteger;)Ljava/math/BigInteger;

    move-result-object v1

    .line 126
    :goto_38
    invoke-virtual {p0}, Lorg/spongycastle/crypto/kems/ECIESKeyEncapsulation;->createBasePointMultiplier()Lorg/spongycastle/math/ec/ECMultiplier;

    move-result-object v5

    .line 128
    const/4 v6, 0x2

    new-array v6, v6, [Lorg/spongycastle/math/ec/ECPoint;

    .line 129
    invoke-virtual {v3}, Lorg/spongycastle/crypto/params/ECDomainParameters;->getG()Lorg/spongycastle/math/ec/ECPoint;

    move-result-object v3

    invoke-interface {v5, v3, v2}, Lorg/spongycastle/math/ec/ECMultiplier;->multiply(Lorg/spongycastle/math/ec/ECPoint;Ljava/math/BigInteger;)Lorg/spongycastle/math/ec/ECPoint;

    move-result-object v2

    aput-object v2, v6, v7

    .line 130
    invoke-virtual {v0}, Lorg/spongycastle/crypto/params/ECPublicKeyParameters;->getQ()Lorg/spongycastle/math/ec/ECPoint;

    move-result-object v0

    invoke-virtual {v0, v1}, Lorg/spongycastle/math/ec/ECPoint;->multiply(Ljava/math/BigInteger;)Lorg/spongycastle/math/ec/ECPoint;

    move-result-object v0

    aput-object v0, v6, v8

    .line 134
    invoke-virtual {v4, v6}, Lorg/spongycastle/math/ec/ECCurve;->normalizeAll([Lorg/spongycastle/math/ec/ECPoint;)V

    .line 136
    aget-object v0, v6, v7

    aget-object v1, v6, v8

    .line 139
    invoke-virtual {v0, v7}, Lorg/spongycastle/math/ec/ECPoint;->getEncoded(Z)[B

    move-result-object v0

    .line 140
    array-length v2, v0

    invoke-static {v0, v7, p1, p2, v2}, Ljava/lang/System;->arraycopy(Ljava/lang/Object;ILjava/lang/Object;II)V

    .line 143
    invoke-virtual {v1}, Lorg/spongycastle/math/ec/ECPoint;->getAffineXCoord()Lorg/spongycastle/math/ec/ECFieldElement;

    move-result-object v1

    invoke-virtual {v1}, Lorg/spongycastle/math/ec/ECFieldElement;->getEncoded()[B

    move-result-object v1

    .line 145
    invoke-virtual {p0, p3, v0, v1}, Lorg/spongycastle/crypto/kems/ECIESKeyEncapsulation;->deriveKey(I[B[B)Lorg/spongycastle/crypto/params/KeyParameter;

    move-result-object v0

    return-object v0

    :cond_6f
    move-object v1, v2

    .line 124
    goto :goto_38
.end method

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

    .prologue
    .line 88
    instance-of v0, p1, Lorg/spongycastle/crypto/params/ECKeyParameters;

    if-nez v0, :cond_c

    .line 90
    new-instance v0, Ljava/lang/IllegalArgumentException;

    const-string v1, "EC key required"

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

    throw v0

    .line 94
    :cond_c
    check-cast p1, Lorg/spongycastle/crypto/params/ECKeyParameters;

    iput-object p1, p0, Lorg/spongycastle/crypto/kems/ECIESKeyEncapsulation;->key:Lorg/spongycastle/crypto/params/ECKeyParameters;

    .line 96
    return-void
.end method