X931RNG.smali

.class public Lorg/spongycastle/crypto/prng/X931RNG;
.super Ljava/lang/Object;
.source "X931RNG.java"


# static fields
.field private static final BLOCK128_MAX_BITS_REQUEST:I = 0x40000

.field private static final BLOCK128_RESEED_MAX:J = 0x800000L

.field private static final BLOCK64_MAX_BITS_REQUEST:I = 0x1000

.field private static final BLOCK64_RESEED_MAX:J = 0x8000L


# instance fields
.field private final DT:[B

.field private final I:[B

.field private final R:[B

.field private V:[B

.field private final engine:Lorg/spongycastle/crypto/BlockCipher;

.field private final entropySource:Lorg/spongycastle/crypto/prng/EntropySource;

.field private reseedCounter:J


# direct methods
.method public constructor <init>(Lorg/spongycastle/crypto/BlockCipher;[BLorg/spongycastle/crypto/prng/EntropySource;)V
    .registers 7

    .prologue
    const/4 v2, 0x0

    .line 29
    invoke-direct {p0}, Ljava/lang/Object;-><init>()V

    .line 21
    const-wide/16 v0, 0x1

    iput-wide v0, p0, Lorg/spongycastle/crypto/prng/X931RNG;->reseedCounter:J

    .line 30
    iput-object p1, p0, Lorg/spongycastle/crypto/prng/X931RNG;->engine:Lorg/spongycastle/crypto/BlockCipher;

    .line 31
    iput-object p3, p0, Lorg/spongycastle/crypto/prng/X931RNG;->entropySource:Lorg/spongycastle/crypto/prng/EntropySource;

    .line 33
    invoke-interface {p1}, Lorg/spongycastle/crypto/BlockCipher;->getBlockSize()I

    move-result v0

    new-array v0, v0, [B

    iput-object v0, p0, Lorg/spongycastle/crypto/prng/X931RNG;->DT:[B

    .line 35
    iget-object v0, p0, Lorg/spongycastle/crypto/prng/X931RNG;->DT:[B

    iget-object v1, p0, Lorg/spongycastle/crypto/prng/X931RNG;->DT:[B

    array-length v1, v1

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

    .line 37
    invoke-interface {p1}, Lorg/spongycastle/crypto/BlockCipher;->getBlockSize()I

    move-result v0

    new-array v0, v0, [B

    iput-object v0, p0, Lorg/spongycastle/crypto/prng/X931RNG;->I:[B

    .line 38
    invoke-interface {p1}, Lorg/spongycastle/crypto/BlockCipher;->getBlockSize()I

    move-result v0

    new-array v0, v0, [B

    iput-object v0, p0, Lorg/spongycastle/crypto/prng/X931RNG;->R:[B

    .line 39
    return-void
.end method

.method private increment([B)V
    .registers 4

    .prologue
    .line 146
    array-length v0, p1

    add-int/lit8 v0, v0, -0x1

    :goto_3
    if-ltz v0, :cond_11

    .line 148
    aget-byte v1, p1, v0

    add-int/lit8 v1, v1, 0x1

    int-to-byte v1, v1

    aput-byte v1, p1, v0

    if-nez v1, :cond_11

    .line 146
    add-int/lit8 v0, v0, -0x1

    goto :goto_3

    .line 153
    :cond_11
    return-void
.end method

.method private static isTooLarge([BI)Z
    .registers 3

    .prologue
    .line 157
    if-eqz p0, :cond_7

    array-length v0, p0

    if-le v0, p1, :cond_7

    const/4 v0, 0x1

    :goto_6
    return v0

    :cond_7
    const/4 v0, 0x0

    goto :goto_6
.end method

.method private process([B[B[B)V
    .registers 8

    .prologue
    const/4 v1, 0x0

    .line 136
    move v0, v1

    :goto_2
    array-length v2, p1

    if-eq v0, v2, :cond_10

    .line 138
    aget-byte v2, p2, v0

    aget-byte v3, p3, v0

    xor-int/2addr v2, v3

    int-to-byte v2, v2

    aput-byte v2, p1, v0

    .line 136
    add-int/lit8 v0, v0, 0x1

    goto :goto_2

    .line 141
    :cond_10
    iget-object v0, p0, Lorg/spongycastle/crypto/prng/X931RNG;->engine:Lorg/spongycastle/crypto/BlockCipher;

    invoke-interface {v0, p1, v1, p1, v1}, Lorg/spongycastle/crypto/BlockCipher;->processBlock([BI[BI)I

    .line 142
    return-void
.end method


# virtual methods
.method generate([BZ)I
    .registers 9

    .prologue
    const/4 v0, -0x1

    const/4 v1, 0x0

    .line 51
    iget-object v2, p0, Lorg/spongycastle/crypto/prng/X931RNG;->R:[B

    array-length v2, v2

    const/16 v3, 0x8

    if-ne v2, v3, :cond_23

    .line 53
    iget-wide v2, p0, Lorg/spongycastle/crypto/prng/X931RNG;->reseedCounter:J

    const-wide/32 v4, 0x8000

    cmp-long v2, v2, v4

    if-lez v2, :cond_13

    .line 113
    :cond_12
    :goto_12
    return v0

    .line 58
    :cond_13
    const/16 v0, 0x200

    invoke-static {p1, v0}, Lorg/spongycastle/crypto/prng/X931RNG;->isTooLarge([BI)Z

    move-result v0

    if-eqz v0, :cond_3d

    .line 60
    new-instance v0, Ljava/lang/IllegalArgumentException;

    const-string v1, "Number of bits per request limited to 4096"

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

    throw v0

    .line 65
    :cond_23
    iget-wide v2, p0, Lorg/spongycastle/crypto/prng/X931RNG;->reseedCounter:J

    const-wide/32 v4, 0x800000

    cmp-long v2, v2, v4

    if-gtz v2, :cond_12

    .line 70
    const v0, 0x8000

    invoke-static {p1, v0}, Lorg/spongycastle/crypto/prng/X931RNG;->isTooLarge([BI)Z

    move-result v0

    if-eqz v0, :cond_3d

    .line 72
    new-instance v0, Ljava/lang/IllegalArgumentException;

    const-string v1, "Number of bits per request limited to 262144"

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

    throw v0

    .line 76
    :cond_3d
    if-nez p2, :cond_43

    iget-object v0, p0, Lorg/spongycastle/crypto/prng/X931RNG;->V:[B

    if-nez v0, :cond_5e

    .line 78
    :cond_43
    iget-object v0, p0, Lorg/spongycastle/crypto/prng/X931RNG;->entropySource:Lorg/spongycastle/crypto/prng/EntropySource;

    invoke-interface {v0}, Lorg/spongycastle/crypto/prng/EntropySource;->getEntropy()[B

    move-result-object v0

    iput-object v0, p0, Lorg/spongycastle/crypto/prng/X931RNG;->V:[B

    .line 79
    iget-object v0, p0, Lorg/spongycastle/crypto/prng/X931RNG;->V:[B

    array-length v0, v0

    iget-object v2, p0, Lorg/spongycastle/crypto/prng/X931RNG;->engine:Lorg/spongycastle/crypto/BlockCipher;

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

    move-result v2

    if-eq v0, v2, :cond_5e

    .line 81
    new-instance v0, Ljava/lang/IllegalStateException;

    const-string v1, "Insufficient entropy returned"

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

    throw v0

    .line 85
    :cond_5e
    array-length v0, p1

    iget-object v2, p0, Lorg/spongycastle/crypto/prng/X931RNG;->R:[B

    array-length v2, v2

    div-int v2, v0, v2

    move v0, v1

    .line 87
    :goto_65
    if-ge v0, v2, :cond_96

    .line 89
    iget-object v3, p0, Lorg/spongycastle/crypto/prng/X931RNG;->engine:Lorg/spongycastle/crypto/BlockCipher;

    iget-object v4, p0, Lorg/spongycastle/crypto/prng/X931RNG;->DT:[B

    iget-object v5, p0, Lorg/spongycastle/crypto/prng/X931RNG;->I:[B

    invoke-interface {v3, v4, v1, v5, v1}, Lorg/spongycastle/crypto/BlockCipher;->processBlock([BI[BI)I

    .line 90
    iget-object v3, p0, Lorg/spongycastle/crypto/prng/X931RNG;->R:[B

    iget-object v4, p0, Lorg/spongycastle/crypto/prng/X931RNG;->I:[B

    iget-object v5, p0, Lorg/spongycastle/crypto/prng/X931RNG;->V:[B

    invoke-direct {p0, v3, v4, v5}, Lorg/spongycastle/crypto/prng/X931RNG;->process([B[B[B)V

    .line 91
    iget-object v3, p0, Lorg/spongycastle/crypto/prng/X931RNG;->V:[B

    iget-object v4, p0, Lorg/spongycastle/crypto/prng/X931RNG;->R:[B

    iget-object v5, p0, Lorg/spongycastle/crypto/prng/X931RNG;->I:[B

    invoke-direct {p0, v3, v4, v5}, Lorg/spongycastle/crypto/prng/X931RNG;->process([B[B[B)V

    .line 93
    iget-object v3, p0, Lorg/spongycastle/crypto/prng/X931RNG;->R:[B

    iget-object v4, p0, Lorg/spongycastle/crypto/prng/X931RNG;->R:[B

    array-length v4, v4

    mul-int/2addr v4, v0

    iget-object v5, p0, Lorg/spongycastle/crypto/prng/X931RNG;->R:[B

    array-length v5, v5

    invoke-static {v3, v1, p1, v4, v5}, Ljava/lang/System;->arraycopy(Ljava/lang/Object;ILjava/lang/Object;II)V

    .line 95
    iget-object v3, p0, Lorg/spongycastle/crypto/prng/X931RNG;->DT:[B

    invoke-direct {p0, v3}, Lorg/spongycastle/crypto/prng/X931RNG;->increment([B)V

    .line 87
    add-int/lit8 v0, v0, 0x1

    goto :goto_65

    .line 98
    :cond_96
    array-length v0, p1

    iget-object v3, p0, Lorg/spongycastle/crypto/prng/X931RNG;->R:[B

    array-length v3, v3

    mul-int/2addr v3, v2

    sub-int/2addr v0, v3

    .line 100
    if-lez v0, :cond_c7

    .line 102
    iget-object v3, p0, Lorg/spongycastle/crypto/prng/X931RNG;->engine:Lorg/spongycastle/crypto/BlockCipher;

    iget-object v4, p0, Lorg/spongycastle/crypto/prng/X931RNG;->DT:[B

    iget-object v5, p0, Lorg/spongycastle/crypto/prng/X931RNG;->I:[B

    invoke-interface {v3, v4, v1, v5, v1}, Lorg/spongycastle/crypto/BlockCipher;->processBlock([BI[BI)I

    .line 103
    iget-object v3, p0, Lorg/spongycastle/crypto/prng/X931RNG;->R:[B

    iget-object v4, p0, Lorg/spongycastle/crypto/prng/X931RNG;->I:[B

    iget-object v5, p0, Lorg/spongycastle/crypto/prng/X931RNG;->V:[B

    invoke-direct {p0, v3, v4, v5}, Lorg/spongycastle/crypto/prng/X931RNG;->process([B[B[B)V

    .line 104
    iget-object v3, p0, Lorg/spongycastle/crypto/prng/X931RNG;->V:[B

    iget-object v4, p0, Lorg/spongycastle/crypto/prng/X931RNG;->R:[B

    iget-object v5, p0, Lorg/spongycastle/crypto/prng/X931RNG;->I:[B

    invoke-direct {p0, v3, v4, v5}, Lorg/spongycastle/crypto/prng/X931RNG;->process([B[B[B)V

    .line 106
    iget-object v3, p0, Lorg/spongycastle/crypto/prng/X931RNG;->R:[B

    iget-object v4, p0, Lorg/spongycastle/crypto/prng/X931RNG;->R:[B

    array-length v4, v4

    mul-int/2addr v2, v4

    invoke-static {v3, v1, p1, v2, v0}, Ljava/lang/System;->arraycopy(Ljava/lang/Object;ILjava/lang/Object;II)V

    .line 108
    iget-object v0, p0, Lorg/spongycastle/crypto/prng/X931RNG;->DT:[B

    invoke-direct {p0, v0}, Lorg/spongycastle/crypto/prng/X931RNG;->increment([B)V

    .line 111
    :cond_c7
    iget-wide v0, p0, Lorg/spongycastle/crypto/prng/X931RNG;->reseedCounter:J

    const-wide/16 v2, 0x1

    add-long/2addr v0, v2

    iput-wide v0, p0, Lorg/spongycastle/crypto/prng/X931RNG;->reseedCounter:J

    .line 113
    array-length v0, p1

    goto/16 :goto_12
.end method

.method getEntropySource()Lorg/spongycastle/crypto/prng/EntropySource;
    .registers 2

    .prologue
    .line 131
    iget-object v0, p0, Lorg/spongycastle/crypto/prng/X931RNG;->entropySource:Lorg/spongycastle/crypto/prng/EntropySource;

    return-object v0
.end method

.method reseed()V
    .registers 3

    .prologue
    .line 121
    iget-object v0, p0, Lorg/spongycastle/crypto/prng/X931RNG;->entropySource:Lorg/spongycastle/crypto/prng/EntropySource;

    invoke-interface {v0}, Lorg/spongycastle/crypto/prng/EntropySource;->getEntropy()[B

    move-result-object v0

    iput-object v0, p0, Lorg/spongycastle/crypto/prng/X931RNG;->V:[B

    .line 122
    iget-object v0, p0, Lorg/spongycastle/crypto/prng/X931RNG;->V:[B

    array-length v0, v0

    iget-object v1, p0, Lorg/spongycastle/crypto/prng/X931RNG;->engine:Lorg/spongycastle/crypto/BlockCipher;

    invoke-interface {v1}, Lorg/spongycastle/crypto/BlockCipher;->getBlockSize()I

    move-result v1

    if-eq v0, v1, :cond_1b

    .line 124
    new-instance v0, Ljava/lang/IllegalStateException;

    const-string v1, "Insufficient entropy returned"

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

    throw v0

    .line 126
    :cond_1b
    const-wide/16 v0, 0x1

    iput-wide v0, p0, Lorg/spongycastle/crypto/prng/X931RNG;->reseedCounter:J

    .line 127
    return-void
.end method