SRP6Client.smali

.class public Lorg/spongycastle/crypto/agreement/srp/SRP6Client;
.super Ljava/lang/Object;
.source "SRP6Client.java"


# instance fields
.field protected A:Ljava/math/BigInteger;

.field protected B:Ljava/math/BigInteger;

.field protected Key:Ljava/math/BigInteger;

.field protected M1:Ljava/math/BigInteger;

.field protected M2:Ljava/math/BigInteger;

.field protected N:Ljava/math/BigInteger;

.field protected S:Ljava/math/BigInteger;

.field protected a:Ljava/math/BigInteger;

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

.field protected g:Ljava/math/BigInteger;

.field protected random:Ljava/security/SecureRandom;

.field protected u:Ljava/math/BigInteger;

.field protected x:Ljava/math/BigInteger;


# direct methods
.method public constructor <init>()V
    .registers 1

    .prologue
    .line 37
    invoke-direct {p0}, Ljava/lang/Object;-><init>()V

    .line 38
    return-void
.end method

.method private calculateS()Ljava/math/BigInteger;
    .registers 6

    .prologue
    .line 98
    iget-object v0, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->digest:Lorg/spongycastle/crypto/Digest;

    iget-object v1, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->N:Ljava/math/BigInteger;

    iget-object v2, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->g:Ljava/math/BigInteger;

    invoke-static {v0, v1, v2}, Lorg/spongycastle/crypto/agreement/srp/SRP6Util;->calculateK(Lorg/spongycastle/crypto/Digest;Ljava/math/BigInteger;Ljava/math/BigInteger;)Ljava/math/BigInteger;

    move-result-object v0

    .line 99
    iget-object v1, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->u:Ljava/math/BigInteger;

    iget-object v2, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->x:Ljava/math/BigInteger;

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

    move-result-object v1

    iget-object v2, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->a:Ljava/math/BigInteger;

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

    move-result-object v1

    .line 100
    iget-object v2, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->g:Ljava/math/BigInteger;

    iget-object v3, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->x:Ljava/math/BigInteger;

    iget-object v4, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->N:Ljava/math/BigInteger;

    invoke-virtual {v2, v3, v4}, Ljava/math/BigInteger;->modPow(Ljava/math/BigInteger;Ljava/math/BigInteger;)Ljava/math/BigInteger;

    move-result-object v2

    invoke-virtual {v2, v0}, Ljava/math/BigInteger;->multiply(Ljava/math/BigInteger;)Ljava/math/BigInteger;

    move-result-object v0

    iget-object v2, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->N:Ljava/math/BigInteger;

    invoke-virtual {v0, v2}, Ljava/math/BigInteger;->mod(Ljava/math/BigInteger;)Ljava/math/BigInteger;

    move-result-object v0

    .line 101
    iget-object v2, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->B:Ljava/math/BigInteger;

    invoke-virtual {v2, v0}, Ljava/math/BigInteger;->subtract(Ljava/math/BigInteger;)Ljava/math/BigInteger;

    move-result-object v0

    iget-object v2, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->N:Ljava/math/BigInteger;

    invoke-virtual {v0, v2}, Ljava/math/BigInteger;->mod(Ljava/math/BigInteger;)Ljava/math/BigInteger;

    move-result-object v0

    iget-object v2, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->N:Ljava/math/BigInteger;

    invoke-virtual {v0, v1, v2}, Ljava/math/BigInteger;->modPow(Ljava/math/BigInteger;Ljava/math/BigInteger;)Ljava/math/BigInteger;

    move-result-object v0

    return-object v0
.end method


# virtual methods
.method public calculateClientEvidenceMessage()Ljava/math/BigInteger;
    .registers 6

    .prologue
    .line 113
    iget-object v0, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->A:Ljava/math/BigInteger;

    if-eqz v0, :cond_c

    iget-object v0, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->B:Ljava/math/BigInteger;

    if-eqz v0, :cond_c

    iget-object v0, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->S:Ljava/math/BigInteger;

    if-nez v0, :cond_14

    .line 115
    :cond_c
    new-instance v0, Lorg/spongycastle/crypto/CryptoException;

    const-string v1, "Impossible to compute M1: some data are missing from the previous operations (A,B,S)"

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

    throw v0

    .line 119
    :cond_14
    iget-object v0, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->digest:Lorg/spongycastle/crypto/Digest;

    iget-object v1, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->N:Ljava/math/BigInteger;

    iget-object v2, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->A:Ljava/math/BigInteger;

    iget-object v3, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->B:Ljava/math/BigInteger;

    iget-object v4, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->S:Ljava/math/BigInteger;

    invoke-static {v0, v1, v2, v3, v4}, Lorg/spongycastle/crypto/agreement/srp/SRP6Util;->calculateM1(Lorg/spongycastle/crypto/Digest;Ljava/math/BigInteger;Ljava/math/BigInteger;Ljava/math/BigInteger;Ljava/math/BigInteger;)Ljava/math/BigInteger;

    move-result-object v0

    iput-object v0, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->M1:Ljava/math/BigInteger;

    .line 120
    iget-object v0, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->M1:Ljava/math/BigInteger;

    return-object v0
.end method

.method public calculateSecret(Ljava/math/BigInteger;)Ljava/math/BigInteger;
    .registers 6

    .prologue
    .line 84
    iget-object v0, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->N:Ljava/math/BigInteger;

    invoke-static {v0, p1}, Lorg/spongycastle/crypto/agreement/srp/SRP6Util;->validatePublicValue(Ljava/math/BigInteger;Ljava/math/BigInteger;)Ljava/math/BigInteger;

    move-result-object v0

    iput-object v0, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->B:Ljava/math/BigInteger;

    .line 85
    iget-object v0, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->digest:Lorg/spongycastle/crypto/Digest;

    iget-object v1, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->N:Ljava/math/BigInteger;

    iget-object v2, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->A:Ljava/math/BigInteger;

    iget-object v3, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->B:Ljava/math/BigInteger;

    invoke-static {v0, v1, v2, v3}, Lorg/spongycastle/crypto/agreement/srp/SRP6Util;->calculateU(Lorg/spongycastle/crypto/Digest;Ljava/math/BigInteger;Ljava/math/BigInteger;Ljava/math/BigInteger;)Ljava/math/BigInteger;

    move-result-object v0

    iput-object v0, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->u:Ljava/math/BigInteger;

    .line 86
    invoke-direct {p0}, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->calculateS()Ljava/math/BigInteger;

    move-result-object v0

    iput-object v0, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->S:Ljava/math/BigInteger;

    .line 88
    iget-object v0, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->S:Ljava/math/BigInteger;

    return-object v0
.end method

.method public calculateSessionKey()Ljava/math/BigInteger;
    .registers 4

    .prologue
    .line 156
    iget-object v0, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->S:Ljava/math/BigInteger;

    if-eqz v0, :cond_c

    iget-object v0, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->M1:Ljava/math/BigInteger;

    if-eqz v0, :cond_c

    iget-object v0, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->M2:Ljava/math/BigInteger;

    if-nez v0, :cond_14

    .line 158
    :cond_c
    new-instance v0, Lorg/spongycastle/crypto/CryptoException;

    const-string v1, "Impossible to compute Key: some data are missing from the previous operations (S,M1,M2)"

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

    throw v0

    .line 161
    :cond_14
    iget-object v0, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->digest:Lorg/spongycastle/crypto/Digest;

    iget-object v1, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->N:Ljava/math/BigInteger;

    iget-object v2, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->S:Ljava/math/BigInteger;

    invoke-static {v0, v1, v2}, Lorg/spongycastle/crypto/agreement/srp/SRP6Util;->calculateKey(Lorg/spongycastle/crypto/Digest;Ljava/math/BigInteger;Ljava/math/BigInteger;)Ljava/math/BigInteger;

    move-result-object v0

    iput-object v0, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->Key:Ljava/math/BigInteger;

    .line 162
    iget-object v0, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->Key:Ljava/math/BigInteger;

    return-object v0
.end method

.method public generateClientCredentials([B[B[B)Ljava/math/BigInteger;
    .registers 7

    .prologue
    .line 69
    iget-object v0, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->digest:Lorg/spongycastle/crypto/Digest;

    iget-object v1, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->N:Ljava/math/BigInteger;

    invoke-static {v0, v1, p1, p2, p3}, Lorg/spongycastle/crypto/agreement/srp/SRP6Util;->calculateX(Lorg/spongycastle/crypto/Digest;Ljava/math/BigInteger;[B[B[B)Ljava/math/BigInteger;

    move-result-object v0

    iput-object v0, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->x:Ljava/math/BigInteger;

    .line 70
    invoke-virtual {p0}, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->selectPrivateValue()Ljava/math/BigInteger;

    move-result-object v0

    iput-object v0, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->a:Ljava/math/BigInteger;

    .line 71
    iget-object v0, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->g:Ljava/math/BigInteger;

    iget-object v1, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->a:Ljava/math/BigInteger;

    iget-object v2, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->N:Ljava/math/BigInteger;

    invoke-virtual {v0, v1, v2}, Ljava/math/BigInteger;->modPow(Ljava/math/BigInteger;Ljava/math/BigInteger;)Ljava/math/BigInteger;

    move-result-object v0

    iput-object v0, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->A:Ljava/math/BigInteger;

    .line 73
    iget-object v0, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->A:Ljava/math/BigInteger;

    return-object v0
.end method

.method public init(Ljava/math/BigInteger;Ljava/math/BigInteger;Lorg/spongycastle/crypto/Digest;Ljava/security/SecureRandom;)V
    .registers 5

    .prologue
    .line 49
    iput-object p1, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->N:Ljava/math/BigInteger;

    .line 50
    iput-object p2, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->g:Ljava/math/BigInteger;

    .line 51
    iput-object p3, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->digest:Lorg/spongycastle/crypto/Digest;

    .line 52
    iput-object p4, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->random:Ljava/security/SecureRandom;

    .line 53
    return-void
.end method

.method public init(Lorg/spongycastle/crypto/params/SRP6GroupParameters;Lorg/spongycastle/crypto/Digest;Ljava/security/SecureRandom;)V
    .registers 6

    .prologue
    .line 57
    invoke-virtual {p1}, Lorg/spongycastle/crypto/params/SRP6GroupParameters;->getN()Ljava/math/BigInteger;

    move-result-object v0

    invoke-virtual {p1}, Lorg/spongycastle/crypto/params/SRP6GroupParameters;->getG()Ljava/math/BigInteger;

    move-result-object v1

    invoke-virtual {p0, v0, v1, p2, p3}, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->init(Ljava/math/BigInteger;Ljava/math/BigInteger;Lorg/spongycastle/crypto/Digest;Ljava/security/SecureRandom;)V

    .line 58
    return-void
.end method

.method protected selectPrivateValue()Ljava/math/BigInteger;
    .registers 5

    .prologue
    .line 93
    iget-object v0, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->digest:Lorg/spongycastle/crypto/Digest;

    iget-object v1, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->N:Ljava/math/BigInteger;

    iget-object v2, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->g:Ljava/math/BigInteger;

    iget-object v3, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->random:Ljava/security/SecureRandom;

    invoke-static {v0, v1, v2, v3}, Lorg/spongycastle/crypto/agreement/srp/SRP6Util;->generatePrivateValue(Lorg/spongycastle/crypto/Digest;Ljava/math/BigInteger;Ljava/math/BigInteger;Ljava/security/SecureRandom;)Ljava/math/BigInteger;

    move-result-object v0

    return-object v0
.end method

.method public verifyServerEvidenceMessage(Ljava/math/BigInteger;)Z
    .registers 7

    .prologue
    .line 131
    iget-object v0, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->A:Ljava/math/BigInteger;

    if-eqz v0, :cond_c

    iget-object v0, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->M1:Ljava/math/BigInteger;

    if-eqz v0, :cond_c

    iget-object v0, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->S:Ljava/math/BigInteger;

    if-nez v0, :cond_14

    .line 133
    :cond_c
    new-instance v0, Lorg/spongycastle/crypto/CryptoException;

    const-string v1, "Impossible to compute and verify M2: some data are missing from the previous operations (A,M1,S)"

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

    throw v0

    .line 138
    :cond_14
    iget-object v0, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->digest:Lorg/spongycastle/crypto/Digest;

    iget-object v1, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->N:Ljava/math/BigInteger;

    iget-object v2, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->A:Ljava/math/BigInteger;

    iget-object v3, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->M1:Ljava/math/BigInteger;

    iget-object v4, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->S:Ljava/math/BigInteger;

    invoke-static {v0, v1, v2, v3, v4}, Lorg/spongycastle/crypto/agreement/srp/SRP6Util;->calculateM2(Lorg/spongycastle/crypto/Digest;Ljava/math/BigInteger;Ljava/math/BigInteger;Ljava/math/BigInteger;Ljava/math/BigInteger;)Ljava/math/BigInteger;

    move-result-object v0

    .line 139
    invoke-virtual {v0, p1}, Ljava/math/BigInteger;->equals(Ljava/lang/Object;)Z

    move-result v0

    if-eqz v0, :cond_2c

    .line 141
    iput-object p1, p0, Lorg/spongycastle/crypto/agreement/srp/SRP6Client;->M2:Ljava/math/BigInteger;

    .line 142
    const/4 v0, 0x1

    .line 144
    :goto_2b
    return v0

    :cond_2c
    const/4 v0, 0x0

    goto :goto_2b
.end method