BaseKDFBytesGenerator.smali

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

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


# instance fields
.field private counterStart:I

.field private digest:Lorg/spongycastle/crypto/Digest;

.field private iv:[B

.field private shared:[B


# direct methods
.method protected constructor <init>(ILorg/spongycastle/crypto/Digest;)V
    .registers 3

    .prologue
    .line 34
    invoke-direct {p0}, Ljava/lang/Object;-><init>()V

    .line 35
    iput p1, p0, Lorg/spongycastle/crypto/generators/BaseKDFBytesGenerator;->counterStart:I

    .line 36
    iput-object p2, p0, Lorg/spongycastle/crypto/generators/BaseKDFBytesGenerator;->digest:Lorg/spongycastle/crypto/Digest;

    .line 37
    return-void
.end method


# virtual methods
.method public generateBytes([BII)I
    .registers 20

    .prologue
    .line 81
    move-object/from16 v0, p1

    array-length v2, v0

    sub-int v2, v2, p3

    move/from16 v0, p2

    if-ge v2, v0, :cond_11

    .line 83
    new-instance v2, Lorg/spongycastle/crypto/DataLengthException;

    const-string v3, "output buffer too small"

    invoke-direct {v2, v3}, Lorg/spongycastle/crypto/DataLengthException;-><init>(Ljava/lang/String;)V

    throw v2

    .line 86
    :cond_11
    move/from16 v0, p3

    int-to-long v6, v0

    .line 87
    move-object/from16 v0, p0

    iget-object v2, v0, Lorg/spongycastle/crypto/generators/BaseKDFBytesGenerator;->digest:Lorg/spongycastle/crypto/Digest;

    invoke-interface {v2}, Lorg/spongycastle/crypto/Digest;->getDigestSize()I

    move-result v8

    .line 95
    const-wide v2, 0x1ffffffffL

    cmp-long v2, v6, v2

    if-lez v2, :cond_2d

    .line 97
    new-instance v2, Ljava/lang/IllegalArgumentException;

    const-string v3, "Output length too large"

    invoke-direct {v2, v3}, Ljava/lang/IllegalArgumentException;-><init>(Ljava/lang/String;)V

    throw v2

    .line 100
    :cond_2d
    int-to-long v2, v8

    add-long/2addr v2, v6

    const-wide/16 v4, 0x1

    sub-long/2addr v2, v4

    int-to-long v4, v8

    div-long/2addr v2, v4

    long-to-int v9, v2

    .line 102
    move-object/from16 v0, p0

    iget-object v2, v0, Lorg/spongycastle/crypto/generators/BaseKDFBytesGenerator;->digest:Lorg/spongycastle/crypto/Digest;

    invoke-interface {v2}, Lorg/spongycastle/crypto/Digest;->getDigestSize()I

    move-result v2

    new-array v10, v2, [B

    .line 104
    const/4 v2, 0x4

    new-array v11, v2, [B

    .line 105
    move-object/from16 v0, p0

    iget v2, v0, Lorg/spongycastle/crypto/generators/BaseKDFBytesGenerator;->counterStart:I

    const/4 v3, 0x0

    invoke-static {v2, v11, v3}, Lorg/spongycastle/util/Pack;->intToBigEndian(I[BI)V

    .line 107
    move-object/from16 v0, p0

    iget v2, v0, Lorg/spongycastle/crypto/generators/BaseKDFBytesGenerator;->counterStart:I

    and-int/lit16 v4, v2, -0x100

    .line 109
    const/4 v2, 0x0

    move v5, v2

    move/from16 v3, p2

    move/from16 v2, p3

    :goto_56
    if-ge v5, v9, :cond_b5

    .line 111
    move-object/from16 v0, p0

    iget-object v12, v0, Lorg/spongycastle/crypto/generators/BaseKDFBytesGenerator;->digest:Lorg/spongycastle/crypto/Digest;

    move-object/from16 v0, p0

    iget-object v13, v0, Lorg/spongycastle/crypto/generators/BaseKDFBytesGenerator;->shared:[B

    const/4 v14, 0x0

    move-object/from16 v0, p0

    iget-object v15, v0, Lorg/spongycastle/crypto/generators/BaseKDFBytesGenerator;->shared:[B

    array-length v15, v15

    invoke-interface {v12, v13, v14, v15}, Lorg/spongycastle/crypto/Digest;->update([BII)V

    .line 112
    move-object/from16 v0, p0

    iget-object v12, v0, Lorg/spongycastle/crypto/generators/BaseKDFBytesGenerator;->digest:Lorg/spongycastle/crypto/Digest;

    const/4 v13, 0x0

    const/4 v14, 0x4

    invoke-interface {v12, v11, v13, v14}, Lorg/spongycastle/crypto/Digest;->update([BII)V

    .line 114
    move-object/from16 v0, p0

    iget-object v12, v0, Lorg/spongycastle/crypto/generators/BaseKDFBytesGenerator;->iv:[B

    if-eqz v12, :cond_89

    .line 116
    move-object/from16 v0, p0

    iget-object v12, v0, Lorg/spongycastle/crypto/generators/BaseKDFBytesGenerator;->digest:Lorg/spongycastle/crypto/Digest;

    move-object/from16 v0, p0

    iget-object v13, v0, Lorg/spongycastle/crypto/generators/BaseKDFBytesGenerator;->iv:[B

    const/4 v14, 0x0

    move-object/from16 v0, p0

    iget-object v15, v0, Lorg/spongycastle/crypto/generators/BaseKDFBytesGenerator;->iv:[B

    array-length v15, v15

    invoke-interface {v12, v13, v14, v15}, Lorg/spongycastle/crypto/Digest;->update([BII)V

    .line 119
    :cond_89
    move-object/from16 v0, p0

    iget-object v12, v0, Lorg/spongycastle/crypto/generators/BaseKDFBytesGenerator;->digest:Lorg/spongycastle/crypto/Digest;

    const/4 v13, 0x0

    invoke-interface {v12, v10, v13}, Lorg/spongycastle/crypto/Digest;->doFinal([BI)I

    .line 121
    if-le v2, v8, :cond_ae

    .line 123
    const/4 v12, 0x0

    move-object/from16 v0, p1

    invoke-static {v10, v12, v0, v3, v8}, Ljava/lang/System;->arraycopy(Ljava/lang/Object;ILjava/lang/Object;II)V

    .line 124
    add-int/2addr v3, v8

    .line 125
    sub-int/2addr v2, v8

    .line 132
    :goto_9b
    const/4 v12, 0x3

    aget-byte v13, v11, v12

    add-int/lit8 v13, v13, 0x1

    int-to-byte v13, v13

    aput-byte v13, v11, v12

    if-nez v13, :cond_ab

    .line 134
    add-int/lit16 v4, v4, 0x100

    .line 135
    const/4 v12, 0x0

    invoke-static {v4, v11, v12}, Lorg/spongycastle/util/Pack;->intToBigEndian(I[BI)V

    .line 109
    :cond_ab
    add-int/lit8 v5, v5, 0x1

    goto :goto_56

    .line 129
    :cond_ae
    const/4 v12, 0x0

    move-object/from16 v0, p1

    invoke-static {v10, v12, v0, v3, v2}, Ljava/lang/System;->arraycopy(Ljava/lang/Object;ILjava/lang/Object;II)V

    goto :goto_9b

    .line 139
    :cond_b5
    move-object/from16 v0, p0

    iget-object v2, v0, Lorg/spongycastle/crypto/generators/BaseKDFBytesGenerator;->digest:Lorg/spongycastle/crypto/Digest;

    invoke-interface {v2}, Lorg/spongycastle/crypto/Digest;->reset()V

    .line 141
    long-to-int v2, v6

    return v2
.end method

.method public getDigest()Lorg/spongycastle/crypto/Digest;
    .registers 2

    .prologue
    .line 66
    iget-object v0, p0, Lorg/spongycastle/crypto/generators/BaseKDFBytesGenerator;->digest:Lorg/spongycastle/crypto/Digest;

    return-object v0
.end method

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

    .prologue
    .line 41
    instance-of v0, p1, Lorg/spongycastle/crypto/params/KDFParameters;

    if-eqz v0, :cond_13

    .line 43
    check-cast p1, Lorg/spongycastle/crypto/params/KDFParameters;

    .line 45
    invoke-virtual {p1}, Lorg/spongycastle/crypto/params/KDFParameters;->getSharedSecret()[B

    move-result-object v0

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

    .line 46
    invoke-virtual {p1}, Lorg/spongycastle/crypto/params/KDFParameters;->getIV()[B

    move-result-object v0

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

    .line 54
    :goto_12
    return-void

    .line 48
    :cond_13
    instance-of v0, p1, Lorg/spongycastle/crypto/params/ISO18033KDFParameters;

    if-eqz v0, :cond_23

    .line 50
    check-cast p1, Lorg/spongycastle/crypto/params/ISO18033KDFParameters;

    .line 52
    invoke-virtual {p1}, Lorg/spongycastle/crypto/params/ISO18033KDFParameters;->getSeed()[B

    move-result-object v0

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

    .line 53
    const/4 v0, 0x0

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

    goto :goto_12

    .line 57
    :cond_23
    new-instance v0, Ljava/lang/IllegalArgumentException;

    const-string v1, "KDF parameters required for KDF2Generator"

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

    throw v0
.end method