KDFFeedbackBytesGenerator.smali

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

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


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

.field private static final TWO:Ljava/math/BigInteger;


# instance fields
.field private fixedInputData:[B

.field private generatedBytes:I

.field private final h:I

.field private ios:[B

.field private iv:[B

.field private k:[B

.field private maxSizeExcl:I

.field private final prf:Lorg/spongycastle/crypto/Mac;

.field private useCounter:Z


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

    .prologue
    .line 19
    const-wide/32 v0, 0x7fffffff

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

    move-result-object v0

    sput-object v0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->INTEGER_MAX:Ljava/math/BigInteger;

    .line 20
    const-wide/16 v0, 0x2

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

    move-result-object v0

    sput-object v0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->TWO:Ljava/math/BigInteger;

    return-void
.end method

.method public constructor <init>(Lorg/spongycastle/crypto/Mac;)V
    .registers 3

    .prologue
    .line 44
    invoke-direct {p0}, Ljava/lang/Object;-><init>()V

    .line 45
    iput-object p1, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->prf:Lorg/spongycastle/crypto/Mac;

    .line 46
    invoke-interface {p1}, Lorg/spongycastle/crypto/Mac;->getMacSize()I

    move-result v0

    iput v0, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->h:I

    .line 47
    iget v0, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->h:I

    new-array v0, v0, [B

    iput-object v0, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->k:[B

    .line 48
    return-void
.end method

.method private generateNext()V
    .registers 6

    .prologue
    const/4 v4, 0x0

    .line 138
    iget v0, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->generatedBytes:I

    if-nez v0, :cond_28

    .line 140
    iget-object v0, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->prf:Lorg/spongycastle/crypto/Mac;

    iget-object v1, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->iv:[B

    iget-object v2, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->iv:[B

    array-length v2, v2

    invoke-interface {v0, v1, v4, v2}, Lorg/spongycastle/crypto/Mac;->update([BII)V

    .line 147
    :goto_f
    iget-boolean v0, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->useCounter:Z

    if-eqz v0, :cond_65

    .line 149
    iget v0, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->generatedBytes:I

    iget v1, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->h:I

    div-int/2addr v0, v1

    add-int/lit8 v0, v0, 0x1

    .line 152
    iget-object v1, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->ios:[B

    array-length v1, v1

    packed-switch v1, :pswitch_data_78

    .line 167
    new-instance v0, Ljava/lang/IllegalStateException;

    const-string v1, "Unsupported size of counter i"

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

    throw v0

    .line 144
    :cond_28
    iget-object v0, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->prf:Lorg/spongycastle/crypto/Mac;

    iget-object v1, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->k:[B

    iget-object v2, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->k:[B

    array-length v2, v2

    invoke-interface {v0, v1, v4, v2}, Lorg/spongycastle/crypto/Mac;->update([BII)V

    goto :goto_f

    .line 155
    :pswitch_33
    iget-object v1, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->ios:[B

    shr-int/lit8 v2, v0, 0x18

    aput-byte v2, v1, v4

    .line 158
    :pswitch_39
    iget-object v1, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->ios:[B

    iget-object v2, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->ios:[B

    array-length v2, v2

    add-int/lit8 v2, v2, -0x3

    ushr-int/lit8 v3, v0, 0x10

    int-to-byte v3, v3

    aput-byte v3, v1, v2

    .line 161
    :pswitch_45
    iget-object v1, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->ios:[B

    iget-object v2, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->ios:[B

    array-length v2, v2

    add-int/lit8 v2, v2, -0x2

    ushr-int/lit8 v3, v0, 0x8

    int-to-byte v3, v3

    aput-byte v3, v1, v2

    .line 164
    :pswitch_51
    iget-object v1, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->ios:[B

    iget-object v2, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->ios:[B

    array-length v2, v2

    add-int/lit8 v2, v2, -0x1

    int-to-byte v0, v0

    aput-byte v0, v1, v2

    .line 169
    iget-object v0, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->prf:Lorg/spongycastle/crypto/Mac;

    iget-object v1, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->ios:[B

    iget-object v2, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->ios:[B

    array-length v2, v2

    invoke-interface {v0, v1, v4, v2}, Lorg/spongycastle/crypto/Mac;->update([BII)V

    .line 172
    :cond_65
    iget-object v0, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->prf:Lorg/spongycastle/crypto/Mac;

    iget-object v1, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->fixedInputData:[B

    iget-object v2, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->fixedInputData:[B

    array-length v2, v2

    invoke-interface {v0, v1, v4, v2}, Lorg/spongycastle/crypto/Mac;->update([BII)V

    .line 173
    iget-object v0, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->prf:Lorg/spongycastle/crypto/Mac;

    iget-object v1, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->k:[B

    invoke-interface {v0, v1, v4}, Lorg/spongycastle/crypto/Mac;->doFinal([BI)I

    .line 174
    return-void

    .line 152
    nop

    :pswitch_data_78
    .packed-switch 0x1
        :pswitch_51
        :pswitch_45
        :pswitch_39
        :pswitch_33
    .end packed-switch
.end method


# virtual methods
.method public generateBytes([BII)I
    .registers 9

    .prologue
    .line 99
    iget v0, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->generatedBytes:I

    add-int/2addr v0, p3

    .line 100
    if-ltz v0, :cond_9

    iget v1, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->maxSizeExcl:I

    if-lt v0, v1, :cond_26

    .line 102
    :cond_9
    new-instance v0, Lorg/spongycastle/crypto/DataLengthException;

    new-instance v1, Ljava/lang/StringBuilder;

    const-string v2, "Current KDFCTR may only be used for "

    invoke-direct {v1, v2}, Ljava/lang/StringBuilder;-><init>(Ljava/lang/String;)V

    iget v2, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->maxSizeExcl:I

    invoke-virtual {v1, v2}, Ljava/lang/StringBuilder;->append(I)Ljava/lang/StringBuilder;

    move-result-object v1

    const-string v2, " bytes"

    invoke-virtual {v1, v2}, Ljava/lang/StringBuilder;->append(Ljava/lang/String;)Ljava/lang/StringBuilder;

    move-result-object v1

    invoke-virtual {v1}, Ljava/lang/StringBuilder;->toString()Ljava/lang/String;

    move-result-object v1

    invoke-direct {v0, v1}, Lorg/spongycastle/crypto/DataLengthException;-><init>(Ljava/lang/String;)V

    throw v0

    .line 106
    :cond_26
    iget v0, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->generatedBytes:I

    iget v1, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->h:I

    rem-int/2addr v0, v1

    if-nez v0, :cond_30

    .line 108
    invoke-direct {p0}, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->generateNext()V

    .line 113
    :cond_30
    iget v0, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->generatedBytes:I

    iget v1, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->h:I

    rem-int/2addr v0, v1

    .line 114
    iget v1, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->h:I

    iget v2, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->generatedBytes:I

    iget v3, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->h:I

    rem-int/2addr v2, v3

    sub-int/2addr v1, v2

    .line 115
    invoke-static {v1, p3}, Ljava/lang/Math;->min(II)I

    move-result v1

    .line 116
    iget-object v2, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->k:[B

    invoke-static {v2, v0, p1, p2, v1}, Ljava/lang/System;->arraycopy(Ljava/lang/Object;ILjava/lang/Object;II)V

    .line 117
    iget v0, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->generatedBytes:I

    add-int/2addr v0, v1

    iput v0, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->generatedBytes:I

    .line 118
    sub-int v0, p3, v1

    .line 119
    add-int/2addr v1, p2

    .line 121
    :goto_4e
    if-lez v0, :cond_67

    .line 123
    invoke-direct {p0}, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->generateNext()V

    .line 124
    iget v2, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->h:I

    invoke-static {v2, v0}, Ljava/lang/Math;->min(II)I

    move-result v2

    .line 125
    iget-object v3, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->k:[B

    const/4 v4, 0x0

    invoke-static {v3, v4, p1, v1, v2}, Ljava/lang/System;->arraycopy(Ljava/lang/Object;ILjava/lang/Object;II)V

    .line 126
    iget v3, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->generatedBytes:I

    add-int/2addr v3, v2

    iput v3, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->generatedBytes:I

    .line 127
    sub-int/2addr v0, v2

    .line 128
    add-int/2addr v1, v2

    goto :goto_4e

    .line 131
    :cond_67
    return p3
.end method

.method public getMac()Lorg/spongycastle/crypto/Mac;
    .registers 2

    .prologue
    .line 92
    iget-object v0, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->prf:Lorg/spongycastle/crypto/Mac;

    return-object v0
.end method

.method public init(Lorg/spongycastle/crypto/DerivationParameters;)V
    .registers 6

    .prologue
    const v0, 0x7fffffff

    .line 52
    instance-of v1, p1, Lorg/spongycastle/crypto/params/KDFFeedbackParameters;

    if-nez v1, :cond_f

    .line 54
    new-instance v0, Ljava/lang/IllegalArgumentException;

    const-string v1, "Wrong type of arguments given"

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

    throw v0

    .line 57
    :cond_f
    check-cast p1, Lorg/spongycastle/crypto/params/KDFFeedbackParameters;

    .line 61
    iget-object v1, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->prf:Lorg/spongycastle/crypto/Mac;

    new-instance v2, Lorg/spongycastle/crypto/params/KeyParameter;

    invoke-virtual {p1}, Lorg/spongycastle/crypto/params/KDFFeedbackParameters;->getKI()[B

    move-result-object v3

    invoke-direct {v2, v3}, Lorg/spongycastle/crypto/params/KeyParameter;-><init>([B)V

    invoke-interface {v1, v2}, Lorg/spongycastle/crypto/Mac;->init(Lorg/spongycastle/crypto/CipherParameters;)V

    .line 65
    invoke-virtual {p1}, Lorg/spongycastle/crypto/params/KDFFeedbackParameters;->getFixedInputData()[B

    move-result-object v1

    iput-object v1, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->fixedInputData:[B

    .line 67
    invoke-virtual {p1}, Lorg/spongycastle/crypto/params/KDFFeedbackParameters;->getR()I

    move-result v1

    .line 68
    div-int/lit8 v2, v1, 0x8

    new-array v2, v2, [B

    iput-object v2, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->ios:[B

    .line 70
    invoke-virtual {p1}, Lorg/spongycastle/crypto/params/KDFFeedbackParameters;->useCounter()Z

    move-result v2

    if-eqz v2, :cond_66

    .line 73
    sget-object v2, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->TWO:Ljava/math/BigInteger;

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

    move-result-object v1

    iget v2, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->h:I

    int-to-long v2, v2

    invoke-static {v2, v3}, Ljava/math/BigInteger;->valueOf(J)Ljava/math/BigInteger;

    move-result-object v2

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

    move-result-object v1

    .line 74
    sget-object v2, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->INTEGER_MAX:Ljava/math/BigInteger;

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

    move-result v2

    const/4 v3, 0x1

    if-ne v2, v3, :cond_61

    .line 75
    :goto_4f
    iput v0, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->maxSizeExcl:I

    .line 82
    :goto_51
    invoke-virtual {p1}, Lorg/spongycastle/crypto/params/KDFFeedbackParameters;->getIV()[B

    move-result-object v0

    iput-object v0, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->iv:[B

    .line 83
    invoke-virtual {p1}, Lorg/spongycastle/crypto/params/KDFFeedbackParameters;->useCounter()Z

    move-result v0

    iput-boolean v0, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->useCounter:Z

    .line 87
    const/4 v0, 0x0

    iput v0, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->generatedBytes:I

    .line 88
    return-void

    .line 75
    :cond_61
    invoke-virtual {v1}, Ljava/math/BigInteger;->intValue()I

    move-result v0

    goto :goto_4f

    .line 79
    :cond_66
    iput v0, p0, Lorg/spongycastle/crypto/generators/KDFFeedbackBytesGenerator;->maxSizeExcl:I

    goto :goto_51
.end method