/*
 * Copyright 2009 Henri Verbeet for CodeWeavers
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 *
 */

#include "config.h"
#include "wine/port.h"

#include <stdarg.h>
#ifdef HAVE_COMMONCRYPTO_COMMONCRYPTOR_H
#include <AvailabilityMacros.h>
#include <CommonCrypto/CommonCryptor.h>
#endif

#include "ntstatus.h"
#define WIN32_NO_STATUS
#include "windef.h"
#include "winbase.h"
#include "ntsecapi.h"
#include "bcrypt.h"

#include "bcrypt_internal.h"

#include "wine/debug.h"
#include "wine/heap.h"
#include "wine/library.h"
#include "wine/unicode.h"

WINE_DEFAULT_DEBUG_CHANNEL(bcrypt);

static HINSTANCE instance;

NTSTATUS WINAPI BCryptAddContextFunction(ULONG table, LPCWSTR context, ULONG iface, LPCWSTR function, ULONG pos)
{
    FIXME("%08x, %s, %08x, %s, %u: stub\n", table, debugstr_w(context), iface, debugstr_w(function), pos);
    return STATUS_SUCCESS;
}

NTSTATUS WINAPI BCryptAddContextFunctionProvider(ULONG table, LPCWSTR context, ULONG iface, LPCWSTR function, LPCWSTR provider, ULONG pos)
{
    FIXME("%08x, %s, %08x, %s, %s, %u: stub\n", table, debugstr_w(context), iface, debugstr_w(function), debugstr_w(provider), pos);
    return STATUS_SUCCESS;
}

NTSTATUS WINAPI BCryptRemoveContextFunction(ULONG table, LPCWSTR context, ULONG iface, LPCWSTR function)
{
    FIXME("%08x, %s, %08x, %s: stub\n", table, debugstr_w(context), iface, debugstr_w(function));
    return STATUS_NOT_IMPLEMENTED;
}

NTSTATUS WINAPI BCryptRemoveContextFunctionProvider(ULONG table, LPCWSTR context, ULONG iface, LPCWSTR function, LPCWSTR provider)
{
    FIXME("%08x, %s, %08x, %s, %s: stub\n", table, debugstr_w(context), iface, debugstr_w(function), debugstr_w(provider));
    return STATUS_NOT_IMPLEMENTED;
}

NTSTATUS WINAPI BCryptRegisterProvider(LPCWSTR provider, ULONG flags, PCRYPT_PROVIDER_REG reg)
{
    FIXME("%s, %08x, %p: stub\n", debugstr_w(provider), flags, reg);
    return STATUS_SUCCESS;
}

NTSTATUS WINAPI BCryptUnregisterProvider(LPCWSTR provider)
{
    FIXME("%s: stub\n", debugstr_w(provider));
    return STATUS_NOT_IMPLEMENTED;
}

NTSTATUS WINAPI BCryptEnumAlgorithms(ULONG dwAlgOperations, ULONG *pAlgCount,
                                     BCRYPT_ALGORITHM_IDENTIFIER **ppAlgList, ULONG dwFlags)
{
    FIXME("%08x, %p, %p, %08x - stub\n", dwAlgOperations, pAlgCount, ppAlgList, dwFlags);

    *ppAlgList=NULL;
    *pAlgCount=0;

    return STATUS_NOT_IMPLEMENTED;
}

#define MAX_HASH_OUTPUT_BYTES 64
#define MAX_HASH_BLOCK_BITS 1024

static const struct
{
    ULONG        object_length;
    ULONG        hash_length;
    ULONG        block_bits;
    const WCHAR *alg_name;
    BOOL         symmetric;
}
alg_props[] =
{
    /* ALG_ID_AES    */ {  654,    0,    0, BCRYPT_AES_ALGORITHM,    TRUE },
    /* ALG_ID_MD2    */ {  270,   16,  128, BCRYPT_MD2_ALGORITHM,    FALSE },
    /* ALG_ID_MD4    */ {  270,   16,  512, BCRYPT_MD4_ALGORITHM,    FALSE },
    /* ALG_ID_MD5    */ {  274,   16,  512, BCRYPT_MD5_ALGORITHM,    FALSE },
    /* ALG_ID_RNG    */ {    0,    0,    0, BCRYPT_RNG_ALGORITHM,    FALSE },
    /* ALG_ID_RSA    */ {    0,    0,    0, BCRYPT_RSA_ALGORITHM,    FALSE },
    /* ALG_ID_SHA1   */ {  278,   20,  512, BCRYPT_SHA1_ALGORITHM,   FALSE },
    /* ALG_ID_SHA256 */ {  286,   32,  512, BCRYPT_SHA256_ALGORITHM, FALSE },
    /* ALG_ID_SHA384 */ {  382,   48, 1024, BCRYPT_SHA384_ALGORITHM, FALSE },
    /* ALG_ID_SHA512 */ {  382,   64, 1024, BCRYPT_SHA512_ALGORITHM, FALSE },
    /* ALG_ID_ECDSA_P256 */ { 0,   0,     0, BCRYPT_ECDSA_P256_ALGORITHM, FALSE  },
    /* ALG_ID_ECDSA_P384 */ { 0,   0,     0, BCRYPT_ECDSA_P384_ALGORITHM, FALSE  },
};

NTSTATUS WINAPI BCryptGenRandom(BCRYPT_ALG_HANDLE handle, UCHAR *buffer, ULONG count, ULONG flags)
{
    const DWORD supported_flags = BCRYPT_USE_SYSTEM_PREFERRED_RNG;
    struct algorithm *algorithm = handle;

    TRACE("%p, %p, %u, %08x - semi-stub\n", handle, buffer, count, flags);

    if (!algorithm)
    {
        /* It's valid to call without an algorithm if BCRYPT_USE_SYSTEM_PREFERRED_RNG
         * is set. In this case the preferred system RNG is used.
         */
        if (!(flags & BCRYPT_USE_SYSTEM_PREFERRED_RNG))
            return STATUS_INVALID_HANDLE;
    }
    else if (algorithm->hdr.magic != MAGIC_ALG || algorithm->id != ALG_ID_RNG)
        return STATUS_INVALID_HANDLE;

    if (!buffer)
        return STATUS_INVALID_PARAMETER;

    if (flags & ~supported_flags)
        FIXME("unsupported flags %08x\n", flags & ~supported_flags);

    if (algorithm)
        FIXME("ignoring selected algorithm\n");

    /* When zero bytes are requested the function returns success too. */
    if (!count)
        return STATUS_SUCCESS;

    if (algorithm || (flags & BCRYPT_USE_SYSTEM_PREFERRED_RNG))
    {
        if (RtlGenRandom(buffer, count))
            return STATUS_SUCCESS;
    }

    FIXME("called with unsupported parameters, returning error\n");
    return STATUS_NOT_IMPLEMENTED;
}

NTSTATUS WINAPI BCryptOpenAlgorithmProvider( BCRYPT_ALG_HANDLE *handle, LPCWSTR id, LPCWSTR implementation, DWORD flags )
{
    const DWORD supported_flags = BCRYPT_ALG_HANDLE_HMAC_FLAG;
    struct algorithm *alg;
    enum alg_id alg_id;

    TRACE( "%p, %s, %s, %08x\n", handle, wine_dbgstr_w(id), wine_dbgstr_w(implementation), flags );

    if (!handle || !id) return STATUS_INVALID_PARAMETER;
    if (flags & ~supported_flags)
    {
        FIXME( "unsupported flags %08x\n", flags & ~supported_flags);
        return STATUS_NOT_IMPLEMENTED;
    }

    if (!strcmpW( id, BCRYPT_AES_ALGORITHM )) alg_id = ALG_ID_AES;
    else if (!strcmpW( id, BCRYPT_MD2_ALGORITHM )) alg_id = ALG_ID_MD2;
    else if (!strcmpW( id, BCRYPT_MD4_ALGORITHM )) alg_id = ALG_ID_MD4;
    else if (!strcmpW( id, BCRYPT_MD5_ALGORITHM )) alg_id = ALG_ID_MD5;
    else if (!strcmpW( id, BCRYPT_RNG_ALGORITHM )) alg_id = ALG_ID_RNG;
    else if (!strcmpW( id, BCRYPT_RSA_ALGORITHM )) alg_id = ALG_ID_RSA;
    else if (!strcmpW( id, BCRYPT_SHA1_ALGORITHM )) alg_id = ALG_ID_SHA1;
    else if (!strcmpW( id, BCRYPT_SHA256_ALGORITHM )) alg_id = ALG_ID_SHA256;
    else if (!strcmpW( id, BCRYPT_SHA384_ALGORITHM )) alg_id = ALG_ID_SHA384;
    else if (!strcmpW( id, BCRYPT_SHA512_ALGORITHM )) alg_id = ALG_ID_SHA512;
    else if (!strcmpW( id, BCRYPT_ECDSA_P256_ALGORITHM )) alg_id = ALG_ID_ECDSA_P256;
    else if (!strcmpW( id, BCRYPT_ECDSA_P384_ALGORITHM )) alg_id = ALG_ID_ECDSA_P384;
    else
    {
        FIXME( "algorithm %s not supported\n", debugstr_w(id) );
        return STATUS_NOT_IMPLEMENTED;
    }
    if (implementation && strcmpW( implementation, MS_PRIMITIVE_PROVIDER ))
    {
        FIXME( "implementation %s not supported\n", debugstr_w(implementation) );
        return STATUS_NOT_IMPLEMENTED;
    }

    if (!(alg = heap_alloc( sizeof(*alg) ))) return STATUS_NO_MEMORY;
    alg->hdr.magic = MAGIC_ALG;
    alg->id        = alg_id;
    alg->mode      = MODE_ID_CBC;
    alg->hmac      = flags & BCRYPT_ALG_HANDLE_HMAC_FLAG;

    *handle = alg;
    return STATUS_SUCCESS;
}

NTSTATUS WINAPI BCryptCloseAlgorithmProvider( BCRYPT_ALG_HANDLE handle, DWORD flags )
{
    struct algorithm *alg = handle;

    TRACE( "%p, %08x\n", handle, flags );

    if (!alg || alg->hdr.magic != MAGIC_ALG) return STATUS_INVALID_HANDLE;
    alg->hdr.magic = 0;
    heap_free( alg );
    return STATUS_SUCCESS;
}

NTSTATUS WINAPI BCryptGetFipsAlgorithmMode(BOOLEAN *enabled)
{
    FIXME("%p - semi-stub\n", enabled);

    if (!enabled)
        return STATUS_INVALID_PARAMETER;

    *enabled = FALSE;
    return STATUS_SUCCESS;
}

struct hash_impl
{
    union
    {
        MD2_CTX md2;
        MD4_CTX md4;
        MD5_CTX md5;
        SHA_CTX sha1;
        SHA256_CTX sha256;
        SHA512_CTX sha512;
    } u;
};

static NTSTATUS hash_init( struct hash_impl *hash, enum alg_id alg_id )
{
    switch (alg_id)
    {
    case ALG_ID_MD2:
        md2_init( &hash->u.md2 );
        break;

    case ALG_ID_MD4:
        MD4Init( &hash->u.md4 );
        break;

    case ALG_ID_MD5:
        MD5Init( &hash->u.md5 );
        break;

    case ALG_ID_SHA1:
        A_SHAInit( &hash->u.sha1 );
        break;

    case ALG_ID_SHA256:
        sha256_init( &hash->u.sha256 );
        break;

    case ALG_ID_SHA384:
        sha384_init( &hash->u.sha512 );
        break;

    case ALG_ID_SHA512:
        sha512_init( &hash->u.sha512 );
        break;

    default:
        ERR( "unhandled id %u\n", alg_id );
        return STATUS_NOT_IMPLEMENTED;
    }
    return STATUS_SUCCESS;
}

static NTSTATUS hash_update( struct hash_impl *hash, enum alg_id alg_id,
                             UCHAR *input, ULONG size )
{
    switch (alg_id)
    {
    case ALG_ID_MD2:
        md2_update( &hash->u.md2, input, size );
        break;

    case ALG_ID_MD4:
        MD4Update( &hash->u.md4, input, size );
        break;

    case ALG_ID_MD5:
        MD5Update( &hash->u.md5, input, size );
        break;

    case ALG_ID_SHA1:
        A_SHAUpdate( &hash->u.sha1, input, size );
        break;

    case ALG_ID_SHA256:
        sha256_update( &hash->u.sha256, input, size );
        break;

    case ALG_ID_SHA384:
        sha384_update( &hash->u.sha512, input, size );
        break;

    case ALG_ID_SHA512:
        sha512_update( &hash->u.sha512, input, size );
        break;

    default:
        ERR( "unhandled id %u\n", alg_id );
        return STATUS_NOT_IMPLEMENTED;
    }
    return STATUS_SUCCESS;
}

static NTSTATUS hash_finish( struct hash_impl *hash, enum alg_id alg_id,
                             UCHAR *output, ULONG size )
{
    switch (alg_id)
    {
    case ALG_ID_MD2:
        md2_finalize( &hash->u.md2, output );
        break;

    case ALG_ID_MD4:
        MD4Final( &hash->u.md4 );
        memcpy( output, hash->u.md4.digest, 16 );
        break;

    case ALG_ID_MD5:
        MD5Final( &hash->u.md5 );
        memcpy( output, hash->u.md5.digest, 16 );
        break;

    case ALG_ID_SHA1:
        A_SHAFinal( &hash->u.sha1, (ULONG *)output );
        break;

    case ALG_ID_SHA256:
        sha256_finalize( &hash->u.sha256, output );
        break;

    case ALG_ID_SHA384:
        sha384_finalize( &hash->u.sha512, output );
        break;

    case ALG_ID_SHA512:
        sha512_finalize( &hash->u.sha512, output );
        break;

    default:
        ERR( "unhandled id %u\n", alg_id );
        return STATUS_NOT_IMPLEMENTED;
    }
    return STATUS_SUCCESS;
}

struct hash
{
    struct object    hdr;
    enum alg_id      alg_id;
    BOOL             hmac;
    struct hash_impl outer;
    struct hash_impl inner;
};

#define BLOCK_LENGTH_AES        16

static NTSTATUS generic_alg_property( enum alg_id id, const WCHAR *prop, UCHAR *buf, ULONG size, ULONG *ret_size )
{
    if (!strcmpW( prop, BCRYPT_OBJECT_LENGTH ))
    {
        if (!alg_props[id].object_length)
            return STATUS_NOT_SUPPORTED;
        *ret_size = sizeof(ULONG);
        if (size < sizeof(ULONG))
            return STATUS_BUFFER_TOO_SMALL;
        if (buf)
            *(ULONG *)buf = alg_props[id].object_length;
        return STATUS_SUCCESS;
    }

    if (!strcmpW( prop, BCRYPT_HASH_LENGTH ))
    {
        if (!alg_props[id].hash_length)
            return STATUS_NOT_SUPPORTED;
        *ret_size = sizeof(ULONG);
        if (size < sizeof(ULONG))
            return STATUS_BUFFER_TOO_SMALL;
        if(buf)
            *(ULONG*)buf = alg_props[id].hash_length;
        return STATUS_SUCCESS;
    }

    if (!strcmpW( prop, BCRYPT_ALGORITHM_NAME ))
    {
        *ret_size = (strlenW(alg_props[id].alg_name)+1)*sizeof(WCHAR);
        if (size < *ret_size)
            return STATUS_BUFFER_TOO_SMALL;
        if(buf)
            memcpy(buf, alg_props[id].alg_name, *ret_size);
        return STATUS_SUCCESS;
    }

    return STATUS_NOT_IMPLEMENTED;
}

static NTSTATUS get_aes_property( enum mode_id mode, const WCHAR *prop, UCHAR *buf, ULONG size, ULONG *ret_size )
{
    if (!strcmpW( prop, BCRYPT_BLOCK_LENGTH ))
    {
        *ret_size = sizeof(ULONG);
        if (size < sizeof(ULONG)) return STATUS_BUFFER_TOO_SMALL;
        if (buf) *(ULONG *)buf = BLOCK_LENGTH_AES;
        return STATUS_SUCCESS;
    }
    if (!strcmpW( prop, BCRYPT_CHAINING_MODE ))
    {
        const WCHAR *str;
        switch (mode)
        {
        case MODE_ID_ECB: str = BCRYPT_CHAIN_MODE_ECB; break;
        case MODE_ID_CBC: str = BCRYPT_CHAIN_MODE_CBC; break;
        case MODE_ID_GCM: str = BCRYPT_CHAIN_MODE_GCM; break;
        default: return STATUS_NOT_IMPLEMENTED;
        }

        *ret_size = 64;
        if (size < *ret_size) return STATUS_BUFFER_TOO_SMALL;
        memcpy( buf, str, (strlenW(str) + 1) * sizeof(WCHAR) );
        return STATUS_SUCCESS;
    }
    if (!strcmpW( prop, BCRYPT_KEY_LENGTHS ))
    {
        BCRYPT_KEY_LENGTHS_STRUCT *key_lengths = (void *)buf;
        *ret_size = sizeof(*key_lengths);
        if (key_lengths && size < *ret_size) return STATUS_BUFFER_TOO_SMALL;
        if (key_lengths)
        {
            key_lengths->dwMinLength = 128;
            key_lengths->dwMaxLength = 256;
            key_lengths->dwIncrement = 64;
        }
        return STATUS_SUCCESS;
    }
    if (!strcmpW( prop, BCRYPT_AUTH_TAG_LENGTH ))
    {
        BCRYPT_AUTH_TAG_LENGTHS_STRUCT *tag_length = (void *)buf;
        if (mode != MODE_ID_GCM) return STATUS_NOT_SUPPORTED;
        *ret_size = sizeof(*tag_length);
        if (tag_length && size < *ret_size) return STATUS_BUFFER_TOO_SMALL;
        if (tag_length)
        {
            tag_length->dwMinLength = 12;
            tag_length->dwMaxLength = 16;
            tag_length->dwIncrement =  1;
        }
        return STATUS_SUCCESS;
    }

    FIXME( "unsupported property %s\n", debugstr_w(prop) );
    return STATUS_NOT_IMPLEMENTED;
}

NTSTATUS get_alg_property( const struct algorithm *alg, const WCHAR *prop, UCHAR *buf, ULONG size, ULONG *ret_size )
{
    NTSTATUS status;

    status = generic_alg_property( alg->id, prop, buf, size, ret_size );
    if (status != STATUS_NOT_IMPLEMENTED)
        return status;

    switch (alg->id)
    {
    case ALG_ID_AES:
        return get_aes_property( alg->mode, prop, buf, size, ret_size );

    default:
        break;
    }

    FIXME( "unsupported property %s\n", debugstr_w(prop) );
    return STATUS_NOT_IMPLEMENTED;
}

static NTSTATUS set_alg_property( struct algorithm *alg, const WCHAR *prop, UCHAR *value, ULONG size, ULONG flags )
{
    switch (alg->id)
    {
    case ALG_ID_AES:
        if (!strcmpW( prop, BCRYPT_CHAINING_MODE ))
        {
            if (!strncmpW( (WCHAR *)value, BCRYPT_CHAIN_MODE_ECB, size ))
            {
                alg->mode = MODE_ID_ECB;
                return STATUS_SUCCESS;
            }
            else if (!strncmpW( (WCHAR *)value, BCRYPT_CHAIN_MODE_CBC, size ))
            {
                alg->mode = MODE_ID_CBC;
                return STATUS_SUCCESS;
            }
            else if (!strncmpW( (WCHAR *)value, BCRYPT_CHAIN_MODE_GCM, size ))
            {
                alg->mode = MODE_ID_GCM;
                return STATUS_SUCCESS;
            }
            else
            {
                FIXME( "unsupported mode %s\n", debugstr_wn( (WCHAR *)value, size ) );
                return STATUS_NOT_IMPLEMENTED;
            }
        }
        FIXME( "unsupported aes algorithm property %s\n", debugstr_w(prop) );
        return STATUS_NOT_IMPLEMENTED;

    default:
        FIXME( "unsupported algorithm %u\n", alg->id );
        return STATUS_NOT_IMPLEMENTED;
    }
}

static NTSTATUS get_hash_property( const struct hash *hash, const WCHAR *prop, UCHAR *buf, ULONG size, ULONG *ret_size )
{
    NTSTATUS status;

    status = generic_alg_property( hash->alg_id, prop, buf, size, ret_size );
    if (status == STATUS_NOT_IMPLEMENTED)
        FIXME( "unsupported property %s\n", debugstr_w(prop) );
    return status;
}

static NTSTATUS get_key_property( const struct key *key, const WCHAR *prop, UCHAR *buf, ULONG size, ULONG *ret_size )
{
    switch (key->alg_id)
    {
    case ALG_ID_AES:
        if (!strcmpW( prop, BCRYPT_AUTH_TAG_LENGTH )) return STATUS_NOT_SUPPORTED;
        return get_aes_property( key->u.s.mode, prop, buf, size, ret_size );

    default:
        FIXME( "unsupported algorithm %u\n", key->alg_id );
        return STATUS_NOT_IMPLEMENTED;
    }
}

NTSTATUS WINAPI BCryptGetProperty( BCRYPT_HANDLE handle, LPCWSTR prop, UCHAR *buffer, ULONG count, ULONG *res, ULONG flags )
{
    struct object *object = handle;

    TRACE( "%p, %s, %p, %u, %p, %08x\n", handle, wine_dbgstr_w(prop), buffer, count, res, flags );

    if (!object) return STATUS_INVALID_HANDLE;
    if (!prop || !res) return STATUS_INVALID_PARAMETER;

    switch (object->magic)
    {
    case MAGIC_ALG:
    {
        const struct algorithm *alg = (const struct algorithm *)object;
        return get_alg_property( alg, prop, buffer, count, res );
    }
    case MAGIC_KEY:
    {
        const struct key *key = (const struct key *)object;
        return get_key_property( key, prop, buffer, count, res );
    }
    case MAGIC_HASH:
    {
        const struct hash *hash = (const struct hash *)object;
        return get_hash_property( hash, prop, buffer, count, res );
    }
    default:
        WARN( "unknown magic %08x\n", object->magic );
        return STATUS_INVALID_HANDLE;
    }
}

NTSTATUS WINAPI BCryptCreateHash( BCRYPT_ALG_HANDLE algorithm, BCRYPT_HASH_HANDLE *handle, UCHAR *object, ULONG objectlen,
                                  UCHAR *secret, ULONG secretlen, ULONG flags )
{
    struct algorithm *alg = algorithm;
    UCHAR buffer[MAX_HASH_BLOCK_BITS / 8] = {0};
    struct hash *hash;
    int block_bytes;
    NTSTATUS status;
    int i;

    TRACE( "%p, %p, %p, %u, %p, %u, %08x - stub\n", algorithm, handle, object, objectlen,
           secret, secretlen, flags );
    if (flags)
    {
        FIXME( "unimplemented flags %08x\n", flags );
        return STATUS_NOT_IMPLEMENTED;
    }

    if (!alg || alg->hdr.magic != MAGIC_ALG) return STATUS_INVALID_HANDLE;
    if (object) FIXME( "ignoring object buffer\n" );

    if (!(hash = heap_alloc( sizeof(*hash) ))) return STATUS_NO_MEMORY;
    hash->hdr.magic = MAGIC_HASH;
    hash->alg_id    = alg->id;
    hash->hmac      = alg->hmac;

    /* initialize hash */
    if ((status = hash_init( &hash->inner, hash->alg_id ))) goto end;
    if (!hash->hmac) goto end;

    /* initialize hmac */
    if ((status = hash_init( &hash->outer, hash->alg_id ))) goto end;
    block_bytes = alg_props[hash->alg_id].block_bits / 8;
    if (secretlen > block_bytes)
    {
        struct hash_impl temp;
        if ((status = hash_init( &temp, hash->alg_id ))) goto end;
        if ((status = hash_update( &temp, hash->alg_id, secret, secretlen ))) goto end;
        if ((status = hash_finish( &temp, hash->alg_id, buffer,
                                   alg_props[hash->alg_id].hash_length ))) goto end;
    }
    else
    {
        memcpy( buffer, secret, secretlen );
    }
    for (i = 0; i < block_bytes; i++) buffer[i] ^= 0x5c;
    if ((status = hash_update( &hash->outer, hash->alg_id, buffer, block_bytes ))) goto end;
    for (i = 0; i < block_bytes; i++) buffer[i] ^= (0x5c ^ 0x36);
    status = hash_update( &hash->inner, hash->alg_id, buffer, block_bytes );

end:
    if (status != STATUS_SUCCESS)
    {
        heap_free( hash );
        return status;
    }

    *handle = hash;
    return STATUS_SUCCESS;
}

NTSTATUS WINAPI BCryptDuplicateHash( BCRYPT_HASH_HANDLE handle, BCRYPT_HASH_HANDLE *handle_copy,
                                     UCHAR *object, ULONG objectlen, ULONG flags )
{
    struct hash *hash_orig = handle;
    struct hash *hash_copy;

    TRACE( "%p, %p, %p, %u, %u\n", handle, handle_copy, object, objectlen, flags );

    if (!hash_orig || hash_orig->hdr.magic != MAGIC_HASH) return STATUS_INVALID_HANDLE;
    if (!handle_copy) return STATUS_INVALID_PARAMETER;
    if (object) FIXME( "ignoring object buffer\n" );

    if (!(hash_copy = heap_alloc( sizeof(*hash_copy) )))
        return STATUS_NO_MEMORY;

    memcpy( hash_copy, hash_orig, sizeof(*hash_orig) );

    *handle_copy = hash_copy;
    return STATUS_SUCCESS;
}

NTSTATUS WINAPI BCryptDestroyHash( BCRYPT_HASH_HANDLE handle )
{
    struct hash *hash = handle;

    TRACE( "%p\n", handle );

    if (!hash || hash->hdr.magic != MAGIC_HASH) return STATUS_INVALID_PARAMETER;
    hash->hdr.magic = 0;
    heap_free( hash );
    return STATUS_SUCCESS;
}

NTSTATUS WINAPI BCryptHashData( BCRYPT_HASH_HANDLE handle, UCHAR *input, ULONG size, ULONG flags )
{
    struct hash *hash = handle;

    TRACE( "%p, %p, %u, %08x\n", handle, input, size, flags );

    if (!hash || hash->hdr.magic != MAGIC_HASH) return STATUS_INVALID_HANDLE;
    if (!input) return STATUS_SUCCESS;

    return hash_update( &hash->inner, hash->alg_id, input, size );
}

NTSTATUS WINAPI BCryptFinishHash( BCRYPT_HASH_HANDLE handle, UCHAR *output, ULONG size, ULONG flags )
{
    UCHAR buffer[MAX_HASH_OUTPUT_BYTES];
    struct hash *hash = handle;
    NTSTATUS status;
    int hash_length;

    TRACE( "%p, %p, %u, %08x\n", handle, output, size, flags );

    if (!hash || hash->hdr.magic != MAGIC_HASH) return STATUS_INVALID_HANDLE;
    if (!output) return STATUS_INVALID_PARAMETER;

    if (!hash->hmac)
        return hash_finish( &hash->inner, hash->alg_id, output, size );

    hash_length = alg_props[hash->alg_id].hash_length;
    if ((status = hash_finish( &hash->inner, hash->alg_id, buffer, hash_length ))) return status;
    if ((status = hash_update( &hash->outer, hash->alg_id, buffer, hash_length ))) return status;
    return hash_finish( &hash->outer, hash->alg_id, output, size );
}

NTSTATUS WINAPI BCryptHash( BCRYPT_ALG_HANDLE algorithm, UCHAR *secret, ULONG secretlen,
                            UCHAR *input, ULONG inputlen, UCHAR *output, ULONG outputlen )
{
    NTSTATUS status;
    BCRYPT_HASH_HANDLE handle;

    TRACE( "%p, %p, %u, %p, %u, %p, %u\n", algorithm, secret, secretlen,
           input, inputlen, output, outputlen );

    status = BCryptCreateHash( algorithm, &handle, NULL, 0, secret, secretlen, 0);
    if (status != STATUS_SUCCESS)
    {
        return status;
    }

    status = BCryptHashData( handle, input, inputlen, 0 );
    if (status != STATUS_SUCCESS)
    {
        BCryptDestroyHash( handle );
        return status;
    }

    status = BCryptFinishHash( handle, output, outputlen, 0 );
    if (status != STATUS_SUCCESS)
    {
        BCryptDestroyHash( handle );
        return status;
    }

    return BCryptDestroyHash( handle );
}

#if defined(HAVE_GNUTLS_CIPHER_INIT) || defined(HAVE_COMMONCRYPTO_COMMONCRYPTOR_H) && MAC_OS_X_VERSION_MAX_ALLOWED >= 1080
BOOL key_is_symmetric( struct key *key )
{
    return alg_props[key->alg_id].symmetric;
}

static NTSTATUS key_import( BCRYPT_ALG_HANDLE algorithm, const WCHAR *type, BCRYPT_KEY_HANDLE *key, UCHAR *object,
                            ULONG object_len, UCHAR *input, ULONG input_len )
{
    ULONG len;

    if (!strcmpW( type, BCRYPT_KEY_DATA_BLOB ))
    {
        BCRYPT_KEY_DATA_BLOB_HEADER *header = (BCRYPT_KEY_DATA_BLOB_HEADER *)input;

        if (input_len < sizeof(BCRYPT_KEY_DATA_BLOB_HEADER)) return STATUS_BUFFER_TOO_SMALL;
        if (header->dwMagic != BCRYPT_KEY_DATA_BLOB_MAGIC) return STATUS_INVALID_PARAMETER;
        if (header->dwVersion != BCRYPT_KEY_DATA_BLOB_VERSION1)
        {
            FIXME( "unknown key data blob version %u\n", header->dwVersion );
            return STATUS_INVALID_PARAMETER;
        }
        len = header->cbKeyData;
        if (len + sizeof(BCRYPT_KEY_DATA_BLOB_HEADER) > input_len) return STATUS_INVALID_PARAMETER;

        return BCryptGenerateSymmetricKey( algorithm, key, object, object_len, (UCHAR *)&header[1], len, 0 );
    }
    else if (!strcmpW( type, BCRYPT_OPAQUE_KEY_BLOB ))
    {
        if (input_len < sizeof(len)) return STATUS_BUFFER_TOO_SMALL;
        len = *(ULONG *)input;
        if (len + sizeof(len) > input_len) return STATUS_INVALID_PARAMETER;

        return BCryptGenerateSymmetricKey( algorithm, key, object, object_len, input + sizeof(len), len, 0 );
    }

    FIXME( "unsupported key type %s\n", debugstr_w(type) );
    return STATUS_NOT_IMPLEMENTED;
}

static NTSTATUS key_export( struct key *key, const WCHAR *type, UCHAR *output, ULONG output_len, ULONG *size )
{
    if (!strcmpW( type, BCRYPT_KEY_DATA_BLOB ))
    {
        BCRYPT_KEY_DATA_BLOB_HEADER *header = (BCRYPT_KEY_DATA_BLOB_HEADER *)output;
        ULONG req_size = sizeof(BCRYPT_KEY_DATA_BLOB_HEADER) + key->u.s.secret_len;

        *size = req_size;
        if (output_len < req_size) return STATUS_BUFFER_TOO_SMALL;

        header->dwMagic   = BCRYPT_KEY_DATA_BLOB_MAGIC;
        header->dwVersion = BCRYPT_KEY_DATA_BLOB_VERSION1;
        header->cbKeyData = key->u.s.secret_len;
        memcpy( &header[1], key->u.s.secret, key->u.s.secret_len );
        return STATUS_SUCCESS;
    }
    else if (!strcmpW( type, BCRYPT_OPAQUE_KEY_BLOB ))
    {
        ULONG len, req_size = sizeof(len) + key->u.s.secret_len;

        *size = req_size;
        if (output_len < req_size) return STATUS_BUFFER_TOO_SMALL;

        *(ULONG *)output = key->u.s.secret_len;
        memcpy( output + sizeof(len), key->u.s.secret, key->u.s.secret_len );
        return STATUS_SUCCESS;
    }

    FIXME( "unsupported key type %s\n", debugstr_w(type) );
    return STATUS_NOT_IMPLEMENTED;
}

static NTSTATUS key_duplicate( struct key *key_orig, struct key *key_copy )
{
    UCHAR *buffer;

    memset( key_copy, 0, sizeof(*key_copy) );
    key_copy->hdr    = key_orig->hdr;
    key_copy->alg_id = key_orig->alg_id;

    if (key_is_symmetric( key_orig ))
    {
        if (!(buffer = heap_alloc( key_orig->u.s.secret_len ))) return STATUS_NO_MEMORY;
        memcpy( buffer, key_orig->u.s.secret, key_orig->u.s.secret_len );

        key_copy->u.s.mode       = key_orig->u.s.mode;
        key_copy->u.s.block_size = key_orig->u.s.block_size;
        key_copy->u.s.secret     = buffer;
        key_copy->u.s.secret_len = key_orig->u.s.secret_len;
    }
    else
    {
        if (!(buffer = heap_alloc( key_orig->u.a.pubkey_len ))) return STATUS_NO_MEMORY;
        memcpy( buffer, key_orig->u.a.pubkey, key_orig->u.a.pubkey_len );

        key_copy->u.a.pubkey     = buffer;
        key_copy->u.a.pubkey_len = key_orig->u.a.pubkey_len;
    }

    return STATUS_SUCCESS;
}

static NTSTATUS key_encrypt( struct key *key,  UCHAR *input, ULONG input_len, void *padding, UCHAR *iv,
                             ULONG iv_len, UCHAR *output, ULONG output_len, ULONG *ret_len, ULONG flags )
{
    ULONG bytes_left = input_len;
    UCHAR *buf, *src, *dst;
    NTSTATUS status;

    if (key->u.s.mode == MODE_ID_GCM)
    {
        BCRYPT_AUTHENTICATED_CIPHER_MODE_INFO *auth_info = padding;

        if (!auth_info) return STATUS_INVALID_PARAMETER;
        if (!auth_info->pbNonce) return STATUS_INVALID_PARAMETER;
        if (!auth_info->pbTag) return STATUS_INVALID_PARAMETER;
        if (auth_info->cbTag < 12 || auth_info->cbTag > 16) return STATUS_INVALID_PARAMETER;
        if (auth_info->dwFlags & BCRYPT_AUTH_MODE_CHAIN_CALLS_FLAG)
            FIXME( "call chaining not implemented\n" );

        if ((status = key_symmetric_set_params( key, auth_info->pbNonce, auth_info->cbNonce )))
            return status;

        *ret_len = input_len;
        if (flags & BCRYPT_BLOCK_PADDING) return STATUS_INVALID_PARAMETER;
        if (input && !output) return STATUS_SUCCESS;
        if (output_len < *ret_len) return STATUS_BUFFER_TOO_SMALL;

        if ((status = key_symmetric_set_auth_data( key, auth_info->pbAuthData, auth_info->cbAuthData )))
            return status;
        if ((status = key_symmetric_encrypt( key, input, input_len, output, output_len ))) return status;

        return key_symmetric_get_tag( key, auth_info->pbTag, auth_info->cbTag );
    }

    if ((status = key_symmetric_set_params( key, iv, iv_len ))) return status;
    *ret_len = input_len;

    if (flags & BCRYPT_BLOCK_PADDING)
        *ret_len = (input_len + key->u.s.block_size) & ~(key->u.s.block_size - 1);
    else if (input_len & (key->u.s.block_size - 1))
        return STATUS_INVALID_BUFFER_SIZE;

    if (!output) return STATUS_SUCCESS;
    if (output_len < *ret_len) return STATUS_BUFFER_TOO_SMALL;
    if (key->u.s.mode == MODE_ID_ECB && iv) return STATUS_INVALID_PARAMETER;

    src = input;
    dst = output;
    while (bytes_left >= key->u.s.block_size)
    {
        if ((status = key_symmetric_encrypt( key, src, key->u.s.block_size, dst, key->u.s.block_size )))
            return status;
        if (key->u.s.mode == MODE_ID_ECB && (status = key_symmetric_set_params( key, NULL, 0 ))) return status;
        bytes_left -= key->u.s.block_size;
        src += key->u.s.block_size;
        dst += key->u.s.block_size;
    }

    if (flags & BCRYPT_BLOCK_PADDING)
    {
        if (!(buf = heap_alloc( key->u.s.block_size ))) return STATUS_NO_MEMORY;
        memcpy( buf, src, bytes_left );
        memset( buf + bytes_left, key->u.s.block_size - bytes_left, key->u.s.block_size - bytes_left );
        status = key_symmetric_encrypt( key, buf, key->u.s.block_size, dst, key->u.s.block_size );
        heap_free( buf );
    }

    return status;
}

static NTSTATUS key_decrypt( struct key *key, UCHAR *input, ULONG input_len, void *padding, UCHAR *iv,
                             ULONG iv_len, UCHAR *output, ULONG output_len, ULONG *ret_len, ULONG flags )
{
    ULONG bytes_left = input_len;
    UCHAR *buf, *src, *dst;
    NTSTATUS status;

    if (key->u.s.mode == MODE_ID_GCM)
    {
        BCRYPT_AUTHENTICATED_CIPHER_MODE_INFO *auth_info = padding;
        UCHAR tag[16];

        if (!auth_info) return STATUS_INVALID_PARAMETER;
        if (!auth_info->pbNonce) return STATUS_INVALID_PARAMETER;
        if (!auth_info->pbTag) return STATUS_INVALID_PARAMETER;
        if (auth_info->cbTag < 12 || auth_info->cbTag > 16) return STATUS_INVALID_PARAMETER;

        if ((status = key_symmetric_set_params( key, auth_info->pbNonce, auth_info->cbNonce )))
            return status;

        *ret_len = input_len;
        if (flags & BCRYPT_BLOCK_PADDING) return STATUS_INVALID_PARAMETER;
        if (!output) return STATUS_SUCCESS;
        if (output_len < *ret_len) return STATUS_BUFFER_TOO_SMALL;

        if ((status = key_symmetric_set_auth_data( key, auth_info->pbAuthData, auth_info->cbAuthData )))
            return status;
        if ((status = key_symmetric_decrypt( key, input, input_len, output, output_len ))) return status;

        if ((status = key_symmetric_get_tag( key, tag, sizeof(tag) ))) return status;
        if (memcmp( tag, auth_info->pbTag, auth_info->cbTag )) return STATUS_AUTH_TAG_MISMATCH;

        return STATUS_SUCCESS;
    }

    if ((status = key_symmetric_set_params( key, iv, iv_len ))) return status;

    *ret_len = input_len;

    if (input_len & (key->u.s.block_size - 1)) return STATUS_INVALID_BUFFER_SIZE;
    if (!output) return STATUS_SUCCESS;
    if (flags & BCRYPT_BLOCK_PADDING)
    {
        if (output_len + key->u.s.block_size < *ret_len) return STATUS_BUFFER_TOO_SMALL;
        if (input_len < key->u.s.block_size) return STATUS_BUFFER_TOO_SMALL;
        bytes_left -= key->u.s.block_size;
    }
    else if (output_len < *ret_len) return STATUS_BUFFER_TOO_SMALL;

    if (key->u.s.mode == MODE_ID_ECB && iv) return STATUS_INVALID_PARAMETER;

    src = input;
    dst = output;
    while (bytes_left >= key->u.s.block_size)
    {
        if ((status = key_symmetric_decrypt( key, src, key->u.s.block_size, dst, key->u.s.block_size )))
            return status;
        if (key->u.s.mode == MODE_ID_ECB && (status = key_symmetric_set_params( key, NULL, 0 ))) return status;
        bytes_left -= key->u.s.block_size;
        src += key->u.s.block_size;
        dst += key->u.s.block_size;
    }

    if (flags & BCRYPT_BLOCK_PADDING)
    {
        if (!(buf = heap_alloc( key->u.s.block_size ))) return STATUS_NO_MEMORY;
        status = key_symmetric_decrypt( key, src, key->u.s.block_size, buf, key->u.s.block_size );
        if (!status && buf[ key->u.s.block_size - 1 ] <= key->u.s.block_size)
        {
            *ret_len -= buf[ key->u.s.block_size - 1 ];
            if (output_len < *ret_len) status = STATUS_BUFFER_TOO_SMALL;
            else memcpy( dst, buf, key->u.s.block_size - buf[ key->u.s.block_size - 1 ] );
        }
        else status = STATUS_UNSUCCESSFUL; /* FIXME: invalid padding */
        heap_free( buf );
    }

    return status;
}

static NTSTATUS key_import_pair( struct algorithm *alg, const WCHAR *type, BCRYPT_KEY_HANDLE *ret_key, UCHAR *input,
                                 ULONG input_len )
{
    struct key *key;
    NTSTATUS status;

    if (!strcmpW( type, BCRYPT_ECCPUBLIC_BLOB ))
    {
        BCRYPT_ECCKEY_BLOB *ecc_blob = (BCRYPT_ECCKEY_BLOB *)input;
        DWORD key_size, magic;

        if (input_len < sizeof(*ecc_blob)) return STATUS_INVALID_PARAMETER;

        switch (alg->id)
        {
        case ALG_ID_ECDSA_P256:
            key_size = 32;
            magic = BCRYPT_ECDSA_PUBLIC_P256_MAGIC;
            break;

        case ALG_ID_ECDSA_P384:
            key_size = 48;
            magic = BCRYPT_ECDSA_PUBLIC_P384_MAGIC;
            break;

        default:
            FIXME( "algorithm %u does not yet support importing blob of type %s\n", alg->id, debugstr_w(type) );
            return STATUS_NOT_SUPPORTED;
        }

        if (ecc_blob->dwMagic != magic) return STATUS_NOT_SUPPORTED;
        if (ecc_blob->cbKey != key_size) return STATUS_INVALID_PARAMETER;

        if (!(key = heap_alloc( sizeof(*key) ))) return STATUS_NO_MEMORY;
        key->hdr.magic = MAGIC_KEY;
        if ((status = key_asymmetric_init( key, alg, (BYTE *)ecc_blob, sizeof(*ecc_blob) + ecc_blob->cbKey * 2 )))
        {
            heap_free( key );
            return status;
        }

        *ret_key = key;
        return STATUS_SUCCESS;
    }
    else if (!strcmpW( type, BCRYPT_RSAPUBLIC_BLOB ))
    {
        BCRYPT_RSAKEY_BLOB *rsa_blob = (BCRYPT_RSAKEY_BLOB *)input;
        ULONG size;

        if (input_len < sizeof(*rsa_blob)) return STATUS_INVALID_PARAMETER;
        if (alg->id != ALG_ID_RSA || rsa_blob->Magic != BCRYPT_RSAPUBLIC_MAGIC) return STATUS_NOT_SUPPORTED;

        if (!(key = heap_alloc( sizeof(*key) ))) return STATUS_NO_MEMORY;
        key->hdr.magic = MAGIC_KEY;

        size = sizeof(*rsa_blob) + rsa_blob->cbPublicExp + rsa_blob->cbModulus;
        if ((status = key_asymmetric_init( key, alg, (BYTE *)rsa_blob, size )))
        {
            heap_free( key );
            return status;
        }

        *ret_key = key;
        return STATUS_SUCCESS;
    }

    FIXME( "unsupported key type %s\n", debugstr_w(type) );
    return STATUS_NOT_SUPPORTED;
}
#else
NTSTATUS key_symmetric_init( struct key *key, struct algorithm *alg, const UCHAR *secret, ULONG secret_len )
{
    ERR( "support for keys not available at build time\n" );
    return STATUS_NOT_IMPLEMENTED;
}

BOOL key_is_symmetric( struct key *key )
{
    ERR( "support for keys not available at build time\n" );
    return FALSE;
}

NTSTATUS key_set_property( struct key *key, const WCHAR *prop, UCHAR *value, ULONG size, ULONG flags )
{
    ERR( "support for keys not available at build time\n" );
    return STATUS_NOT_IMPLEMENTED;
}

static NTSTATUS key_duplicate( struct key *key_orig, struct key *key_copy )
{
    ERR( "support for keys not available at build time\n" );
    return STATUS_NOT_IMPLEMENTED;
}

NTSTATUS key_asymmetric_verify( struct key *key, void *padding, UCHAR *hash, ULONG hash_len, UCHAR *signature,
                                ULONG signature_len, DWORD flags )
{
    ERR( "support for keys not available at build time\n" );
    return STATUS_NOT_IMPLEMENTED;
}

static NTSTATUS key_import( BCRYPT_ALG_HANDLE algorithm, const WCHAR *type, BCRYPT_KEY_HANDLE *key, UCHAR *object,
                            ULONG object_len, UCHAR *input, ULONG input_len )
{
    ERR( "support for keys not available at build time\n" );
    return STATUS_NOT_IMPLEMENTED;
}

static NTSTATUS key_export( struct key *key, const WCHAR *type, UCHAR *output, ULONG output_len, ULONG *size )
{
    ERR( "support for keys not available at build time\n" );
    return STATUS_NOT_IMPLEMENTED;
}

NTSTATUS key_destroy( struct key *key )
{
    ERR( "support for keys not available at build time\n" );
    return STATUS_NOT_IMPLEMENTED;
}

static NTSTATUS key_encrypt( struct key *key,  UCHAR *input, ULONG input_len, void *padding, UCHAR *iv,
                             ULONG iv_len, UCHAR *output, ULONG output_len, ULONG *ret_len, ULONG flags )
{
    ERR( "support for keys not available at build time\n" );
    return STATUS_NOT_IMPLEMENTED;
}

static NTSTATUS key_decrypt( struct key *key, UCHAR *input, ULONG input_len, void *padding, UCHAR *iv,
                             ULONG iv_len, UCHAR *output, ULONG output_len, ULONG *ret_len, ULONG flags )
{
    ERR( "support for keys not available at build time\n" );
    return STATUS_NOT_IMPLEMENTED;
}

static NTSTATUS key_import_pair( struct algorithm *alg, const WCHAR *type, BCRYPT_KEY_HANDLE *ret_key, UCHAR *input,
                                 ULONG input_len )
{
    ERR( "support for keys not available at build time\n" );
    return STATUS_NOT_IMPLEMENTED;
}
#endif

NTSTATUS WINAPI BCryptGenerateSymmetricKey( BCRYPT_ALG_HANDLE algorithm, BCRYPT_KEY_HANDLE *handle,
                                            UCHAR *object, ULONG object_len, UCHAR *secret, ULONG secret_len,
                                            ULONG flags )
{
    struct algorithm *alg = algorithm;
    struct key *key;
    NTSTATUS status;

    TRACE( "%p, %p, %p, %u, %p, %u, %08x\n", algorithm, handle, object, object_len, secret, secret_len, flags );

    if (!alg || alg->hdr.magic != MAGIC_ALG) return STATUS_INVALID_HANDLE;
    if (object) FIXME( "ignoring object buffer\n" );

    if (!(key = heap_alloc( sizeof(*key) ))) return STATUS_NO_MEMORY;
    key->hdr.magic = MAGIC_KEY;

    if ((status = key_symmetric_init( key, alg, secret, secret_len )))
    {
        heap_free( key );
        return status;
    }

    *handle = key;
    return STATUS_SUCCESS;
}

NTSTATUS WINAPI BCryptImportKey( BCRYPT_ALG_HANDLE algorithm, BCRYPT_KEY_HANDLE decrypt_key, LPCWSTR type,
                                 BCRYPT_KEY_HANDLE *key, PUCHAR object, ULONG object_len, PUCHAR input,
                                 ULONG input_len, ULONG flags )
{
    struct algorithm *alg = algorithm;

    TRACE("%p, %p, %s, %p, %p, %u, %p, %u, %u\n", algorithm, decrypt_key, debugstr_w(type), key, object,
          object_len, input, input_len, flags);

    if (!alg || alg->hdr.magic != MAGIC_ALG) return STATUS_INVALID_HANDLE;
    if (!key || !type || !input) return STATUS_INVALID_PARAMETER;

    if (decrypt_key)
    {
        FIXME( "decryption of key not yet supported\n" );
        return STATUS_NOT_IMPLEMENTED;
    }

    return key_import( algorithm, type, key, object, object_len, input, input_len );
}

NTSTATUS WINAPI BCryptExportKey( BCRYPT_KEY_HANDLE export_key, BCRYPT_KEY_HANDLE encrypt_key, LPCWSTR type,
                                 PUCHAR output, ULONG output_len, ULONG *size, ULONG flags )
{
    struct key *key = export_key;

    TRACE("%p, %p, %s, %p, %u, %p, %u\n", key, encrypt_key, debugstr_w(type), output, output_len, size, flags);

    if (!key || key->hdr.magic != MAGIC_KEY) return STATUS_INVALID_HANDLE;
    if (!output || !type || !size) return STATUS_INVALID_PARAMETER;

    if (encrypt_key)
    {
        FIXME( "encryption of key not yet supported\n" );
        return STATUS_NOT_IMPLEMENTED;
    }

    return key_export( key, type, output, output_len, size );
}

NTSTATUS WINAPI BCryptDuplicateKey( BCRYPT_KEY_HANDLE handle, BCRYPT_KEY_HANDLE *handle_copy,
                                    UCHAR *object, ULONG object_len, ULONG flags )
{
    struct key *key_orig = handle;
    struct key *key_copy;
    NTSTATUS status;

    TRACE( "%p, %p, %p, %u, %08x\n", handle, handle_copy, object, object_len, flags );
    if (object) FIXME( "ignoring object buffer\n" );

    if (!key_orig || key_orig->hdr.magic != MAGIC_KEY) return STATUS_INVALID_HANDLE;
    if (!handle_copy) return STATUS_INVALID_PARAMETER;
    if (!(key_copy = heap_alloc( sizeof(*key_copy) ))) return STATUS_NO_MEMORY;

    if ((status = key_duplicate( key_orig, key_copy )))
    {
        heap_free( key_copy );
        return status;
    }

    *handle_copy = key_copy;
    return STATUS_SUCCESS;
}

NTSTATUS WINAPI BCryptImportKeyPair( BCRYPT_ALG_HANDLE algorithm, BCRYPT_KEY_HANDLE decrypt_key, const WCHAR *type,
                                     BCRYPT_KEY_HANDLE *ret_key, UCHAR *input, ULONG input_len, ULONG flags )
{
    struct algorithm *alg = algorithm;

    TRACE( "%p, %p, %s, %p, %p, %u, %08x\n", algorithm, decrypt_key, debugstr_w(type), ret_key, input,
           input_len, flags );

    if (!alg || alg->hdr.magic != MAGIC_ALG) return STATUS_INVALID_HANDLE;
    if (!ret_key || !type || !input) return STATUS_INVALID_PARAMETER;
    if (decrypt_key)
    {
        FIXME( "decryption of key not yet supported\n" );
        return STATUS_NOT_IMPLEMENTED;
    }

    return key_import_pair( alg, type, ret_key, input, input_len );
}

NTSTATUS WINAPI BCryptVerifySignature( BCRYPT_KEY_HANDLE handle, void *padding, UCHAR *hash, ULONG hash_len,
                                       UCHAR *signature, ULONG signature_len, ULONG flags )
{
    struct key *key = handle;

    TRACE( "%p, %p, %p, %u, %p, %u, %08x\n", handle, padding, hash, hash_len, signature, signature_len, flags );

    if (!key || key->hdr.magic != MAGIC_KEY) return STATUS_INVALID_HANDLE;
    if (!hash || !hash_len || !signature || !signature_len) return STATUS_INVALID_PARAMETER;
    if (key_is_symmetric( key )) return STATUS_NOT_SUPPORTED;

    return key_asymmetric_verify( key, padding, hash, hash_len, signature, signature_len, flags );
}

NTSTATUS WINAPI BCryptDestroyKey( BCRYPT_KEY_HANDLE handle )
{
    struct key *key = handle;

    TRACE( "%p\n", handle );

    if (!key || key->hdr.magic != MAGIC_KEY) return STATUS_INVALID_HANDLE;
    key->hdr.magic = 0;
    return key_destroy( key );
}

NTSTATUS WINAPI BCryptEncrypt( BCRYPT_KEY_HANDLE handle, UCHAR *input, ULONG input_len, void *padding, UCHAR *iv,
                               ULONG iv_len, UCHAR *output, ULONG output_len, ULONG *ret_len, ULONG flags )
{
    struct key *key = handle;

    TRACE( "%p, %p, %u, %p, %p, %u, %p, %u, %p, %08x\n", handle, input, input_len, padding, iv, iv_len, output,
           output_len, ret_len, flags );

    if (!key || key->hdr.magic != MAGIC_KEY) return STATUS_INVALID_HANDLE;
    if (!key_is_symmetric( key ))
    {
        FIXME( "encryption with asymmetric keys not yet supported\n" );
        return STATUS_NOT_IMPLEMENTED;
    }
    if (flags & ~BCRYPT_BLOCK_PADDING)
    {
        FIXME( "flags %08x not implemented\n", flags );
        return STATUS_NOT_IMPLEMENTED;
    }

    return key_encrypt( key, input, input_len, padding, iv, iv_len, output, output_len, ret_len, flags );
}

NTSTATUS WINAPI BCryptDecrypt( BCRYPT_KEY_HANDLE handle, UCHAR *input, ULONG input_len, void *padding, UCHAR *iv,
                               ULONG iv_len, UCHAR *output, ULONG output_len, ULONG *ret_len, ULONG flags )
{
    struct key *key = handle;

    TRACE( "%p, %p, %u, %p, %p, %u, %p, %u, %p, %08x\n", handle, input, input_len, padding, iv, iv_len, output,
           output_len, ret_len, flags );

    if (!key || key->hdr.magic != MAGIC_KEY) return STATUS_INVALID_HANDLE;
    if (!key_is_symmetric( key ))
    {
        FIXME( "decryption with asymmetric keys not yet supported\n" );
        return STATUS_NOT_IMPLEMENTED;
    }
    if (flags & ~BCRYPT_BLOCK_PADDING)
    {
        FIXME( "flags %08x not supported\n", flags );
        return STATUS_NOT_IMPLEMENTED;
    }

    return key_decrypt( key, input, input_len, padding, iv, iv_len, output, output_len, ret_len, flags );
}

NTSTATUS WINAPI BCryptSetProperty( BCRYPT_HANDLE handle, const WCHAR *prop, UCHAR *value, ULONG size, ULONG flags )
{
    struct object *object = handle;

    TRACE( "%p, %s, %p, %u, %08x\n", handle, debugstr_w(prop), value, size, flags );

    if (!object) return STATUS_INVALID_HANDLE;

    switch (object->magic)
    {
    case MAGIC_ALG:
    {
        struct algorithm *alg = (struct algorithm *)object;
        return set_alg_property( alg, prop, value, size, flags );
    }
    case MAGIC_KEY:
    {
        struct key *key = (struct key *)object;
        return key_set_property( key, prop, value, size, flags );
    }
    default:
        WARN( "unknown magic %08x\n", object->magic );
        return STATUS_INVALID_HANDLE;
    }
}

BOOL WINAPI DllMain( HINSTANCE hinst, DWORD reason, LPVOID reserved )
{
    switch (reason)
    {
    case DLL_PROCESS_ATTACH:
        instance = hinst;
        DisableThreadLibraryCalls( hinst );
#ifdef HAVE_GNUTLS_CIPHER_INIT
        gnutls_initialize();
#endif
        break;

    case DLL_PROCESS_DETACH:
        if (reserved) break;
#ifdef HAVE_GNUTLS_CIPHER_INIT
        gnutls_uninitialize();
#endif
        break;
    }
    return TRUE;
}
