ZipCryptoEngine.smali

.class public Lnet/lingala/zip4j/crypto/engine/ZipCryptoEngine;
.super Ljava/lang/Object;


# static fields
.field private static final CRC_TABLE:[I


# instance fields
.field private final keys:[I


# direct methods
.method static constructor <clinit>()V
    .registers 7

    const/16 v0, 0x100

    new-array v1, v0, [I

    .line 1
    sput-object v1, Lnet/lingala/zip4j/crypto/engine/ZipCryptoEngine;->CRC_TABLE:[I

    const/4 v1, 0x0

    move v2, v1

    :goto_8
    if-ge v2, v0, :cond_25

    move v3, v1

    move v4, v2

    :goto_c
    const/16 v5, 0x8

    if-ge v3, v5, :cond_1e

    and-int/lit8 v5, v4, 0x1

    const/4 v6, 0x1

    ushr-int/lit8 v4, v4, 0x1

    if-ne v5, v6, :cond_1b

    const v5, -0x12477ce0

    xor-int/2addr v4, v5

    :cond_1b
    add-int/lit8 v3, v3, 0x1

    goto :goto_c

    .line 13
    :cond_1e
    sget-object v3, Lnet/lingala/zip4j/crypto/engine/ZipCryptoEngine;->CRC_TABLE:[I

    aput v4, v3, v2

    add-int/lit8 v2, v2, 0x1

    goto :goto_8

    :cond_25
    return-void
.end method

.method public constructor <init>()V
    .registers 2

    .line 1
    invoke-direct {p0}, Ljava/lang/Object;-><init>()V

    const/4 v0, 0x3

    new-array v0, v0, [I

    .line 3
    iput-object v0, p0, Lnet/lingala/zip4j/crypto/engine/ZipCryptoEngine;->keys:[I

    return-void
.end method

.method private crc32(IB)I
    .registers 5

    ushr-int/lit8 v0, p1, 0x8

    .line 1
    sget-object v1, Lnet/lingala/zip4j/crypto/engine/ZipCryptoEngine;->CRC_TABLE:[I

    xor-int/2addr p1, p2

    and-int/lit16 p1, p1, 0xff

    aget p1, v1, p1

    xor-int/2addr p1, v0

    return p1
.end method


# virtual methods
.method public decryptByte()B
    .registers 3

    .line 1
    iget-object v0, p0, Lnet/lingala/zip4j/crypto/engine/ZipCryptoEngine;->keys:[I

    const/4 v1, 0x2

    aget v0, v0, v1

    or-int/2addr v0, v1

    xor-int/lit8 v1, v0, 0x1

    mul-int/2addr v0, v1

    ushr-int/lit8 v0, v0, 0x8

    int-to-byte v0, v0

    return v0
.end method

.method public initKeys([CZ)V
    .registers 7

    .line 1
    iget-object v0, p0, Lnet/lingala/zip4j/crypto/engine/ZipCryptoEngine;->keys:[I

    const v1, 0x12345678

    const/4 v2, 0x0

    aput v1, v0, v2

    const v1, 0x23456789

    const/4 v3, 0x1

    .line 2
    aput v1, v0, v3

    const/4 v1, 0x2

    const v3, 0x34567890

    .line 3
    aput v3, v0, v1

    .line 4
    invoke-static {p1, p2}, Lnet/lingala/zip4j/util/Zip4jUtil;->convertCharArrayToByteArray([CZ)[B

    move-result-object p1

    .line 5
    array-length p2, p1

    :goto_19
    if-ge v2, p2, :cond_26

    aget-byte v0, p1, v2

    and-int/lit16 v0, v0, 0xff

    int-to-byte v0, v0

    .line 6
    invoke-virtual {p0, v0}, Lnet/lingala/zip4j/crypto/engine/ZipCryptoEngine;->updateKeys(B)V

    add-int/lit8 v2, v2, 0x1

    goto :goto_19

    :cond_26
    return-void
.end method

.method public updateKeys(B)V
    .registers 5

    .line 1
    iget-object v0, p0, Lnet/lingala/zip4j/crypto/engine/ZipCryptoEngine;->keys:[I

    const/4 v1, 0x0

    aget v2, v0, v1

    invoke-direct {p0, v2, p1}, Lnet/lingala/zip4j/crypto/engine/ZipCryptoEngine;->crc32(IB)I

    move-result p1

    aput p1, v0, v1

    .line 2
    iget-object p1, p0, Lnet/lingala/zip4j/crypto/engine/ZipCryptoEngine;->keys:[I

    const/4 v0, 0x1

    aget v2, p1, v0

    aget v1, p1, v1

    and-int/lit16 v1, v1, 0xff

    add-int/2addr v2, v1

    aput v2, p1, v0

    .line 3
    aget v1, p1, v0

    const v2, 0x8088405

    mul-int/2addr v1, v2

    add-int/2addr v1, v0

    aput v1, p1, v0

    const/4 v1, 0x2

    .line 4
    aget v2, p1, v1

    aget v0, p1, v0

    shr-int/lit8 v0, v0, 0x18

    int-to-byte v0, v0

    invoke-direct {p0, v2, v0}, Lnet/lingala/zip4j/crypto/engine/ZipCryptoEngine;->crc32(IB)I

    move-result v0

    aput v0, p1, v1

    return-void
.end method