wiiqt/WiiQt/nandspare.cpp

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#include "nandspare.h"
#include "tools.h"
NandSpare::NandSpare()
{
}
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void NandSpare::SetHMacKey( const QByteArray &key )
{
hmacKey = key;
}
quint8 NandSpare::Parity( quint8 x )
{
quint8 y = 0;
while( x )
{
y ^= ( x & 1 );
x >>= 1;
}
return y;
}
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QByteArray NandSpare::CalcEcc( const QByteArray &in )
{
if( in.size() != 0x800 )
return QByteArray();
quint8 a[ 12 ][ 2 ];
quint32 a0, a1;
quint8 x;
QByteArray ret( 16, '\0' );
char* ecc = ret.data();
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const char* data = in.data();
for( int k = 0; k < 4; k++ )
{
memset( a, 0, sizeof a );
for( int i = 0; i < 512; i++ )
{
x = data[ i ];
for( int j = 0; j < 9; j++ )
a[ 3 + j ][ ( i >> j ) & 1 ] ^= x;
}
x = a[ 3 ][ 0 ] ^ a[ 3 ][ 1 ];
a[ 0 ][ 0 ] = x & 0x55;
a[ 0 ][ 1 ] = x & 0xaa;
a[ 1 ][ 0 ] = x & 0x33;
a[ 1 ][ 1 ] = x & 0xcc;
a[ 2 ][ 0 ] = x & 0x0f;
a[ 2 ][ 1 ] = x & 0xf0;
for( int j = 0; j < 12; j++ )
{
a[ j ][ 0 ] = Parity( a[ j ][ 0 ]);
a[ j ][ 1 ] = Parity( a[ j ][ 1 ]);
}
a0 = a1 = 0;
for( int j = 0; j < 12; j++ )
{
a0 |= a[ j ][ 0 ] << j;
a1 |= a[ j ][ 1 ] << j;
}
ecc[ 0 ] = a0;
ecc[ 1 ] = a0 >> 8;
ecc[ 2 ] = a1;
ecc[ 3 ] = a1 >> 8;
data += 512;
ecc += 4;
}
return ret;
}
typedef struct{
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unsigned char key[ 0x40 ];
SHA1Context hash_ctx;
} hmac_ctx;
void wbe32(void *ptr, quint32 val) { *(quint32*)ptr = qFromBigEndian( (quint32)val ); }
void wbe16(void *ptr, quint16 val) { *(quint16*)ptr = qFromBigEndian( val ); }
// reversing done by gray
static unsigned char hmac_key[ 20 ];
void hmac_init(hmac_ctx *ctx, const char *key, int key_size)
{
key_size = key_size<0x40 ? key_size: 0x40;
memset( ctx->key,0,0x40 );
memcpy( ctx->key,key,key_size );
for( int i = 0; i < 0x40; ++i )
ctx->key[ i ] ^= 0x36; // ipad
SHA1Reset( &ctx->hash_ctx );
SHA1Input( &ctx->hash_ctx, ctx->key, 0x40 );
}
void hmac_update( hmac_ctx *ctx, const quint8 *data, int size )
{
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SHA1Input( &ctx->hash_ctx,data,size );
}
void hmac_final( hmac_ctx *ctx, unsigned char *hmac )
{
//int i;
unsigned char hash[ 0x14 ];
memset( hash, 0, 0x14 );
SHA1Result(&ctx->hash_ctx);
// this sha1 implementation is buggy, needs to switch endian
for( int i = 0;i < 5;++i )
{
wbe32( hash + 4 * i, ctx->hash_ctx.Message_Digest[ i ] );
}
for( int i = 0; i < 0x40; ++i )
ctx->key[i] ^= 0x36^0x5c; // opad
SHA1Reset(&ctx->hash_ctx);
SHA1Input(&ctx->hash_ctx,ctx->key,0x40);
SHA1Input(&ctx->hash_ctx,hash,0x14);
SHA1Result(&ctx->hash_ctx);
//hexdump(ctx->hash_ctx.Message_Digest, 0x14);
for( int i = 0; i < 5; ++i )
{
wbe32( hash + 4 * i, ctx->hash_ctx.Message_Digest[ i ] );
}
memcpy( hmac, hash, 0x14 );
}
void fs_hmac_set_key(const char *key, int key_size)
{
memset( hmac_key, 0, 0x14 );
memcpy( hmac_key, key, key_size < 0x14 ? key_size : 0x14 );
}
void fs_hmac_generic( const unsigned char *data, int size, const unsigned char *extra, int extra_size, unsigned char *hmac )
{
hmac_ctx ctx;
hmac_init( &ctx,(const char *)hmac_key,0x14 );
hmac_update( &ctx,extra, extra_size );
hmac_update( &ctx,data, size );
hmac_final( &ctx, hmac );
}
void fs_hmac_meta( const unsigned char *super_data, short super_blk, unsigned char *hmac )
{
unsigned char extra[ 0x40 ];
memset( extra,0,0x40 );
wbe16( extra + 0x12, super_blk );
fs_hmac_generic( super_data, 0x40000, extra, 0x40, hmac );
}
void fs_hmac_data( const unsigned char *data, quint32 uid, const unsigned char *name, quint32 entry_n, quint32 x3, quint16 blk, unsigned char *hmac )
{
//int i,j;
unsigned char extra[ 0x40 ];
memset( extra, 0, 0x40 );
wbe32( extra, uid );
memcpy( extra + 4, name, 12 );
wbe16( extra + 0x12, blk );
wbe32( extra + 0x14, entry_n );
wbe32( extra + 0x18, x3 );
// fprintf(stderr,"extra (%s): \nX ",name);
// for(i=0;i<0x20;++i){
// fprintf(stderr,"%02X ",extra[i]);
// if(!((i+1)&0xf)) fprintf(stderr,"\nX ");
// }
fs_hmac_generic( data, 0x4000, extra, 0x40, hmac );
}
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QByteArray NandSpare::Get_hmac_data( const QByteArray &cluster, quint32 uid, const unsigned char *name, quint32 entry_n, quint32 x3, quint16 blk )
{
//qDebug() << "NandSpare::Get_hmac_data" << hex << cluster.size() << uid << QString( QByteArray( (const char*)name, 12 ) ) << entry_n << x3 << blk;
if( hmacKey.size() != 0x14 || cluster.size() != 0x4000 )
return QByteArray();
fs_hmac_set_key( hmacKey.data(), 0x14 );
QByteArray ret( 0x14, '\xba' );
fs_hmac_data( (const unsigned char *)cluster.data(), uid, name, entry_n, x3, blk, (unsigned char *)ret.data() );
return ret;
}
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QByteArray NandSpare::Get_hmac_meta( const QByteArray &cluster, quint16 super_blk )
{
//qDebug() << "NandSpare::Get_hmac_meta" << hex << super_blk;
if( hmacKey.size() != 0x14 || cluster.size() != 0x40000 )
{
//qDebug() << "NandSpare::Get_hmac_meta" << hex << hmacKey.size() << cluster.size();
return QByteArray();
}
fs_hmac_set_key( hmacKey.data(), 0x14 );
QByteArray ret( 0x14, '\0' );
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fs_hmac_meta( (const unsigned char *)cluster.data(), super_blk, (unsigned char *)ret.data() );
return ret;
}