HMacSP800DRBG.smali

.class public Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;
.super Ljava/lang/Object;
.source "HMacSP800DRBG.java"

# interfaces
.implements Lorg/spongycastle/crypto/prng/drbg/SP80090DRBG;


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

.field private static final RESEED_MAX:J = 0x800000000000L


# instance fields
.field private _K:[B

.field private _V:[B

.field private _entropySource:Lorg/spongycastle/crypto/prng/EntropySource;

.field private _hMac:Lorg/spongycastle/crypto/Mac;

.field private _reseedCounter:J

.field private _securityStrength:I


# direct methods
.method public constructor <init>(Lorg/spongycastle/crypto/Mac;ILorg/spongycastle/crypto/prng/EntropySource;[B[B)V
    .registers 9

    .prologue
    .line 36
    invoke-direct {p0}, Ljava/lang/Object;-><init>()V

    .line 37
    invoke-static {p1}, Lorg/spongycastle/crypto/prng/drbg/Utils;->getMaxSecurityStrength(Lorg/spongycastle/crypto/Mac;)I

    move-result v0

    if-le p2, v0, :cond_11

    .line 39
    new-instance v0, Ljava/lang/IllegalArgumentException;

    const-string v1, "Requested security strength is not supported by the derivation function"

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

    throw v0

    .line 42
    :cond_11
    invoke-interface {p3}, Lorg/spongycastle/crypto/prng/EntropySource;->entropySize()I

    move-result v0

    if-ge v0, p2, :cond_1f

    .line 44
    new-instance v0, Ljava/lang/IllegalArgumentException;

    const-string v1, "Not enough entropy for security strength required"

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

    throw v0

    .line 47
    :cond_1f
    iput p2, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_securityStrength:I

    .line 48
    iput-object p3, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_entropySource:Lorg/spongycastle/crypto/prng/EntropySource;

    .line 49
    iput-object p1, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_hMac:Lorg/spongycastle/crypto/Mac;

    .line 51
    invoke-direct {p0}, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->getEntropy()[B

    move-result-object v0

    .line 52
    invoke-static {v0, p5, p4}, Lorg/spongycastle/util/Arrays;->concatenate([B[B[B)[B

    move-result-object v0

    .line 54
    invoke-interface {p1}, Lorg/spongycastle/crypto/Mac;->getMacSize()I

    move-result v1

    new-array v1, v1, [B

    iput-object v1, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_K:[B

    .line 55
    iget-object v1, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_K:[B

    array-length v1, v1

    new-array v1, v1, [B

    iput-object v1, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_V:[B

    .line 56
    iget-object v1, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_V:[B

    const/4 v2, 0x1

    invoke-static {v1, v2}, Lorg/spongycastle/util/Arrays;->fill([BB)V

    .line 58
    invoke-direct {p0, v0}, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->hmac_DRBG_Update([B)V

    .line 60
    const-wide/16 v0, 0x1

    iput-wide v0, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_reseedCounter:J

    .line 61
    return-void
.end method

.method private getEntropy()[B
    .registers 4

    .prologue
    .line 186
    iget-object v0, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_entropySource:Lorg/spongycastle/crypto/prng/EntropySource;

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

    move-result-object v0

    .line 188
    array-length v1, v0

    iget v2, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_securityStrength:I

    add-int/lit8 v2, v2, 0x7

    div-int/lit8 v2, v2, 0x8

    if-ge v1, v2, :cond_17

    .line 190
    new-instance v0, Ljava/lang/IllegalStateException;

    const-string v1, "Insufficient entropy provided by entropy source"

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

    throw v0

    .line 192
    :cond_17
    return-object v0
.end method

.method private hmac_DRBG_Update([B)V
    .registers 3

    .prologue
    .line 65
    const/4 v0, 0x0

    invoke-direct {p0, p1, v0}, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->hmac_DRBG_Update_Func([BB)V

    .line 66
    if-eqz p1, :cond_a

    .line 68
    const/4 v0, 0x1

    invoke-direct {p0, p1, v0}, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->hmac_DRBG_Update_Func([BB)V

    .line 70
    :cond_a
    return-void
.end method

.method private hmac_DRBG_Update_Func([BB)V
    .registers 7

    .prologue
    const/4 v3, 0x0

    .line 74
    iget-object v0, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_hMac:Lorg/spongycastle/crypto/Mac;

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

    iget-object v2, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_K:[B

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

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

    .line 76
    iget-object v0, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_hMac:Lorg/spongycastle/crypto/Mac;

    iget-object v1, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_V:[B

    iget-object v2, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_V:[B

    array-length v2, v2

    invoke-interface {v0, v1, v3, v2}, Lorg/spongycastle/crypto/Mac;->update([BII)V

    .line 77
    iget-object v0, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_hMac:Lorg/spongycastle/crypto/Mac;

    invoke-interface {v0, p2}, Lorg/spongycastle/crypto/Mac;->update(B)V

    .line 79
    if-eqz p1, :cond_24

    .line 81
    iget-object v0, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_hMac:Lorg/spongycastle/crypto/Mac;

    array-length v1, p1

    invoke-interface {v0, p1, v3, v1}, Lorg/spongycastle/crypto/Mac;->update([BII)V

    .line 84
    :cond_24
    iget-object v0, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_hMac:Lorg/spongycastle/crypto/Mac;

    iget-object v1, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_K:[B

    invoke-interface {v0, v1, v3}, Lorg/spongycastle/crypto/Mac;->doFinal([BI)I

    .line 86
    iget-object v0, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_hMac:Lorg/spongycastle/crypto/Mac;

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

    iget-object v2, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_K:[B

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

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

    .line 87
    iget-object v0, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_hMac:Lorg/spongycastle/crypto/Mac;

    iget-object v1, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_V:[B

    iget-object v2, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_V:[B

    array-length v2, v2

    invoke-interface {v0, v1, v3, v2}, Lorg/spongycastle/crypto/Mac;->update([BII)V

    .line 89
    iget-object v0, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_hMac:Lorg/spongycastle/crypto/Mac;

    iget-object v1, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_V:[B

    invoke-interface {v0, v1, v3}, Lorg/spongycastle/crypto/Mac;->doFinal([BI)I

    .line 90
    return-void
.end method


# virtual methods
.method public generate([B[BZ)I
    .registers 12

    .prologue
    const/4 v2, 0x0

    .line 113
    array-length v0, p1

    shl-int/lit8 v0, v0, 0x3

    .line 115
    const/high16 v1, 0x40000

    if-le v0, v1, :cond_10

    .line 117
    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 120
    :cond_10
    iget-wide v4, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_reseedCounter:J

    const-wide v6, 0x800000000000L

    cmp-long v1, v4, v6

    if-lez v1, :cond_1d

    .line 122
    const/4 v0, -0x1

    .line 166
    :goto_1c
    return v0

    .line 125
    :cond_1d
    if-eqz p3, :cond_23

    .line 127
    invoke-virtual {p0, p2}, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->reseed([B)V

    .line 128
    const/4 p2, 0x0

    .line 132
    :cond_23
    if-eqz p2, :cond_28

    .line 134
    invoke-direct {p0, p2}, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->hmac_DRBG_Update([B)V

    .line 138
    :cond_28
    array-length v1, p1

    new-array v3, v1, [B

    .line 140
    array-length v1, p1

    iget-object v4, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_V:[B

    array-length v4, v4

    div-int v4, v1, v4

    .line 142
    iget-object v1, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_hMac:Lorg/spongycastle/crypto/Mac;

    new-instance v5, Lorg/spongycastle/crypto/params/KeyParameter;

    iget-object v6, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_K:[B

    invoke-direct {v5, v6}, Lorg/spongycastle/crypto/params/KeyParameter;-><init>([B)V

    invoke-interface {v1, v5}, Lorg/spongycastle/crypto/Mac;->init(Lorg/spongycastle/crypto/CipherParameters;)V

    move v1, v2

    .line 144
    :goto_3e
    if-ge v1, v4, :cond_60

    .line 146
    iget-object v5, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_hMac:Lorg/spongycastle/crypto/Mac;

    iget-object v6, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_V:[B

    iget-object v7, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_V:[B

    array-length v7, v7

    invoke-interface {v5, v6, v2, v7}, Lorg/spongycastle/crypto/Mac;->update([BII)V

    .line 147
    iget-object v5, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_hMac:Lorg/spongycastle/crypto/Mac;

    iget-object v6, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_V:[B

    invoke-interface {v5, v6, v2}, Lorg/spongycastle/crypto/Mac;->doFinal([BI)I

    .line 149
    iget-object v5, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_V:[B

    iget-object v6, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_V:[B

    array-length v6, v6

    mul-int/2addr v6, v1

    iget-object v7, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_V:[B

    array-length v7, v7

    invoke-static {v5, v2, v3, v6, v7}, Ljava/lang/System;->arraycopy(Ljava/lang/Object;ILjava/lang/Object;II)V

    .line 144
    add-int/lit8 v1, v1, 0x1

    goto :goto_3e

    .line 152
    :cond_60
    iget-object v1, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_V:[B

    array-length v1, v1

    mul-int/2addr v1, v4

    array-length v5, v3

    if-ge v1, v5, :cond_88

    .line 154
    iget-object v1, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_hMac:Lorg/spongycastle/crypto/Mac;

    iget-object v5, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_V:[B

    iget-object v6, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_V:[B

    array-length v6, v6

    invoke-interface {v1, v5, v2, v6}, Lorg/spongycastle/crypto/Mac;->update([BII)V

    .line 155
    iget-object v1, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_hMac:Lorg/spongycastle/crypto/Mac;

    iget-object v5, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_V:[B

    invoke-interface {v1, v5, v2}, Lorg/spongycastle/crypto/Mac;->doFinal([BI)I

    .line 157
    iget-object v1, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_V:[B

    iget-object v5, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_V:[B

    array-length v5, v5

    mul-int/2addr v5, v4

    array-length v6, v3

    iget-object v7, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_V:[B

    array-length v7, v7

    mul-int/2addr v4, v7

    sub-int v4, v6, v4

    invoke-static {v1, v2, v3, v5, v4}, Ljava/lang/System;->arraycopy(Ljava/lang/Object;ILjava/lang/Object;II)V

    .line 160
    :cond_88
    invoke-direct {p0, p2}, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->hmac_DRBG_Update([B)V

    .line 162
    iget-wide v4, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_reseedCounter:J

    const-wide/16 v6, 0x1

    add-long/2addr v4, v6

    iput-wide v4, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_reseedCounter:J

    .line 164
    array-length v1, p1

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

    goto :goto_1c
.end method

.method public getBlockSize()I
    .registers 2

    .prologue
    .line 99
    iget-object v0, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_V:[B

    array-length v0, v0

    shl-int/lit8 v0, v0, 0x3

    return v0
.end method

.method public reseed([B)V
    .registers 4

    .prologue
    .line 176
    invoke-direct {p0}, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->getEntropy()[B

    move-result-object v0

    .line 177
    invoke-static {v0, p1}, Lorg/spongycastle/util/Arrays;->concatenate([B[B)[B

    move-result-object v0

    .line 179
    invoke-direct {p0, v0}, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->hmac_DRBG_Update([B)V

    .line 181
    const-wide/16 v0, 0x1

    iput-wide v0, p0, Lorg/spongycastle/crypto/prng/drbg/HMacSP800DRBG;->_reseedCounter:J

    .line 182
    return-void
.end method