/*
 *  FIPS-180-2 compliant SHA-256 implementation
 *
 *  Copyright (C) 2001-2003  Christophe Devine
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <efi/efi.h>
#include <efi/efilib.h>
#ifdef CONFIG_arm
#ifndef BUILD_EFI
/* FIXME:
 * arm efi leaves a visibilit pragma pushed that won't work for
 * non efi programs, so eliminate it */
#pragma GCC visibility pop
#endif
#endif

#include <sha256.h>
#include <pecoff.h>
#include <simple_file.h>
#include <buildefi.h>

#define GET_UINT32(n,b,i)                       \
{                                               \
    (n) = ( (uint32) (b)[(i)    ] << 24 )       \
        | ( (uint32) (b)[(i) + 1] << 16 )       \
        | ( (uint32) (b)[(i) + 2] <<  8 )       \
        | ( (uint32) (b)[(i) + 3]       );      \
}

#define PUT_UINT32(n,b,i)                       \
{                                               \
    (b)[(i)    ] = (uint8) ( (n) >> 24 );       \
    (b)[(i) + 1] = (uint8) ( (n) >> 16 );       \
    (b)[(i) + 2] = (uint8) ( (n) >>  8 );       \
    (b)[(i) + 3] = (uint8) ( (n)       );       \
}

void sha256_starts( sha256_context *ctx )
{
    ctx->total[0] = 0;
    ctx->total[1] = 0;

    ctx->state[0] = 0x6A09E667;
    ctx->state[1] = 0xBB67AE85;
    ctx->state[2] = 0x3C6EF372;
    ctx->state[3] = 0xA54FF53A;
    ctx->state[4] = 0x510E527F;
    ctx->state[5] = 0x9B05688C;
    ctx->state[6] = 0x1F83D9AB;
    ctx->state[7] = 0x5BE0CD19;
}

void sha256_process( sha256_context *ctx, uint8 data[64] )
{
    uint32 temp1, temp2, W[64];
    uint32 A, B, C, D, E, F, G, H;

    GET_UINT32( W[0],  data,  0 );
    GET_UINT32( W[1],  data,  4 );
    GET_UINT32( W[2],  data,  8 );
    GET_UINT32( W[3],  data, 12 );
    GET_UINT32( W[4],  data, 16 );
    GET_UINT32( W[5],  data, 20 );
    GET_UINT32( W[6],  data, 24 );
    GET_UINT32( W[7],  data, 28 );
    GET_UINT32( W[8],  data, 32 );
    GET_UINT32( W[9],  data, 36 );
    GET_UINT32( W[10], data, 40 );
    GET_UINT32( W[11], data, 44 );
    GET_UINT32( W[12], data, 48 );
    GET_UINT32( W[13], data, 52 );
    GET_UINT32( W[14], data, 56 );
    GET_UINT32( W[15], data, 60 );

#define  SHR(x,n) ((x & 0xFFFFFFFF) >> n)
#define ROTR(x,n) (SHR(x,n) | (x << (32 - n)))

#define S0(x) (ROTR(x, 7) ^ ROTR(x,18) ^  SHR(x, 3))
#define S1(x) (ROTR(x,17) ^ ROTR(x,19) ^  SHR(x,10))

#define S2(x) (ROTR(x, 2) ^ ROTR(x,13) ^ ROTR(x,22))
#define S3(x) (ROTR(x, 6) ^ ROTR(x,11) ^ ROTR(x,25))

#define F0(x,y,z) ((x & y) | (z & (x | y)))
#define F1(x,y,z) (z ^ (x & (y ^ z)))

#define R(t)                                    \
(                                               \
    W[t] = S1(W[t -  2]) + W[t -  7] +          \
           S0(W[t - 15]) + W[t - 16]            \
)

#define P(a,b,c,d,e,f,g,h,x,K)                  \
{                                               \
    temp1 = h + S3(e) + F1(e,f,g) + K + x;      \
    temp2 = S2(a) + F0(a,b,c);                  \
    d += temp1; h = temp1 + temp2;              \
}

    A = ctx->state[0];
    B = ctx->state[1];
    C = ctx->state[2];
    D = ctx->state[3];
    E = ctx->state[4];
    F = ctx->state[5];
    G = ctx->state[6];
    H = ctx->state[7];

    P( A, B, C, D, E, F, G, H, W[ 0], 0x428A2F98 );
    P( H, A, B, C, D, E, F, G, W[ 1], 0x71374491 );
    P( G, H, A, B, C, D, E, F, W[ 2], 0xB5C0FBCF );
    P( F, G, H, A, B, C, D, E, W[ 3], 0xE9B5DBA5 );
    P( E, F, G, H, A, B, C, D, W[ 4], 0x3956C25B );
    P( D, E, F, G, H, A, B, C, W[ 5], 0x59F111F1 );
    P( C, D, E, F, G, H, A, B, W[ 6], 0x923F82A4 );
    P( B, C, D, E, F, G, H, A, W[ 7], 0xAB1C5ED5 );
    P( A, B, C, D, E, F, G, H, W[ 8], 0xD807AA98 );
    P( H, A, B, C, D, E, F, G, W[ 9], 0x12835B01 );
    P( G, H, A, B, C, D, E, F, W[10], 0x243185BE );
    P( F, G, H, A, B, C, D, E, W[11], 0x550C7DC3 );
    P( E, F, G, H, A, B, C, D, W[12], 0x72BE5D74 );
    P( D, E, F, G, H, A, B, C, W[13], 0x80DEB1FE );
    P( C, D, E, F, G, H, A, B, W[14], 0x9BDC06A7 );
    P( B, C, D, E, F, G, H, A, W[15], 0xC19BF174 );
    P( A, B, C, D, E, F, G, H, R(16), 0xE49B69C1 );
    P( H, A, B, C, D, E, F, G, R(17), 0xEFBE4786 );
    P( G, H, A, B, C, D, E, F, R(18), 0x0FC19DC6 );
    P( F, G, H, A, B, C, D, E, R(19), 0x240CA1CC );
    P( E, F, G, H, A, B, C, D, R(20), 0x2DE92C6F );
    P( D, E, F, G, H, A, B, C, R(21), 0x4A7484AA );
    P( C, D, E, F, G, H, A, B, R(22), 0x5CB0A9DC );
    P( B, C, D, E, F, G, H, A, R(23), 0x76F988DA );
    P( A, B, C, D, E, F, G, H, R(24), 0x983E5152 );
    P( H, A, B, C, D, E, F, G, R(25), 0xA831C66D );
    P( G, H, A, B, C, D, E, F, R(26), 0xB00327C8 );
    P( F, G, H, A, B, C, D, E, R(27), 0xBF597FC7 );
    P( E, F, G, H, A, B, C, D, R(28), 0xC6E00BF3 );
    P( D, E, F, G, H, A, B, C, R(29), 0xD5A79147 );
    P( C, D, E, F, G, H, A, B, R(30), 0x06CA6351 );
    P( B, C, D, E, F, G, H, A, R(31), 0x14292967 );
    P( A, B, C, D, E, F, G, H, R(32), 0x27B70A85 );
    P( H, A, B, C, D, E, F, G, R(33), 0x2E1B2138 );
    P( G, H, A, B, C, D, E, F, R(34), 0x4D2C6DFC );
    P( F, G, H, A, B, C, D, E, R(35), 0x53380D13 );
    P( E, F, G, H, A, B, C, D, R(36), 0x650A7354 );
    P( D, E, F, G, H, A, B, C, R(37), 0x766A0ABB );
    P( C, D, E, F, G, H, A, B, R(38), 0x81C2C92E );
    P( B, C, D, E, F, G, H, A, R(39), 0x92722C85 );
    P( A, B, C, D, E, F, G, H, R(40), 0xA2BFE8A1 );
    P( H, A, B, C, D, E, F, G, R(41), 0xA81A664B );
    P( G, H, A, B, C, D, E, F, R(42), 0xC24B8B70 );
    P( F, G, H, A, B, C, D, E, R(43), 0xC76C51A3 );
    P( E, F, G, H, A, B, C, D, R(44), 0xD192E819 );
    P( D, E, F, G, H, A, B, C, R(45), 0xD6990624 );
    P( C, D, E, F, G, H, A, B, R(46), 0xF40E3585 );
    P( B, C, D, E, F, G, H, A, R(47), 0x106AA070 );
    P( A, B, C, D, E, F, G, H, R(48), 0x19A4C116 );
    P( H, A, B, C, D, E, F, G, R(49), 0x1E376C08 );
    P( G, H, A, B, C, D, E, F, R(50), 0x2748774C );
    P( F, G, H, A, B, C, D, E, R(51), 0x34B0BCB5 );
    P( E, F, G, H, A, B, C, D, R(52), 0x391C0CB3 );
    P( D, E, F, G, H, A, B, C, R(53), 0x4ED8AA4A );
    P( C, D, E, F, G, H, A, B, R(54), 0x5B9CCA4F );
    P( B, C, D, E, F, G, H, A, R(55), 0x682E6FF3 );
    P( A, B, C, D, E, F, G, H, R(56), 0x748F82EE );
    P( H, A, B, C, D, E, F, G, R(57), 0x78A5636F );
    P( G, H, A, B, C, D, E, F, R(58), 0x84C87814 );
    P( F, G, H, A, B, C, D, E, R(59), 0x8CC70208 );
    P( E, F, G, H, A, B, C, D, R(60), 0x90BEFFFA );
    P( D, E, F, G, H, A, B, C, R(61), 0xA4506CEB );
    P( C, D, E, F, G, H, A, B, R(62), 0xBEF9A3F7 );
    P( B, C, D, E, F, G, H, A, R(63), 0xC67178F2 );

    ctx->state[0] += A;
    ctx->state[1] += B;
    ctx->state[2] += C;
    ctx->state[3] += D;
    ctx->state[4] += E;
    ctx->state[5] += F;
    ctx->state[6] += G;
    ctx->state[7] += H;
}

void sha256_update( sha256_context *ctx, uint8 *input, uint32 length )
{
    uint32 left, fill;

    if( ! length ) return;

    left = ctx->total[0] & 0x3F;
    fill = 64 - left;

    ctx->total[0] += length;
    ctx->total[0] &= 0xFFFFFFFF;

    if( ctx->total[0] < length )
        ctx->total[1]++;

    if( left && length >= fill )
    {
        CopyMem( (void *) (ctx->buffer + left),
                (void *) input, fill );
        sha256_process( ctx, ctx->buffer );
        length -= fill;
        input  += fill;
        left = 0;
    }

    while( length >= 64 )
    {
        sha256_process( ctx, input );
        length -= 64;
        input  += 64;
    }

    if( length )
    {
        CopyMem( (void *) (ctx->buffer + left),
                (void *) input, length );
    }
}

static uint8 sha256_padding[64] =
{
 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};

void sha256_finish( sha256_context *ctx, uint8 digest[SHA256_DIGEST_SIZE] )
{
    uint32 last, padn;
    uint32 high, low;
    uint8 msglen[8];

    high = ( ctx->total[0] >> 29 )
         | ( ctx->total[1] <<  3 );
    low  = ( ctx->total[0] <<  3 );

    PUT_UINT32( high, msglen, 0 );
    PUT_UINT32( low,  msglen, 4 );

    last = ctx->total[0] & 0x3F;
    padn = ( last < 56 ) ? ( 56 - last ) : ( 120 - last );

    sha256_update( ctx, sha256_padding, padn );
    sha256_update( ctx, msglen, 8 );

    PUT_UINT32( ctx->state[0], digest,  0 );
    PUT_UINT32( ctx->state[1], digest,  4 );
    PUT_UINT32( ctx->state[2], digest,  8 );
    PUT_UINT32( ctx->state[3], digest, 12 );
    PUT_UINT32( ctx->state[4], digest, 16 );
    PUT_UINT32( ctx->state[5], digest, 20 );
    PUT_UINT32( ctx->state[6], digest, 24 );
    PUT_UINT32( ctx->state[7], digest, 28 );
}

EFI_STATUS
sha256_get_pecoff_digest_mem(void *buffer, UINTN DataSize,
			     UINT8 hash[SHA256_DIGEST_SIZE])
{
	PE_COFF_LOADER_IMAGE_CONTEXT context;
	sha256_context ctx;
	void *hashbase;
	unsigned int hashsize;
	EFI_IMAGE_SECTION_HEADER *section;
	EFI_IMAGE_SECTION_HEADER **sections;
	int  i, sum_of_bytes, checksum_size;
	EFI_STATUS efi_status;
	void *checksum_ptr;

	/* add extra end alignment; rely on data buffer being zero
	 * filled to the end of the page */
	DataSize = ALIGN_VALUE(DataSize, 8);

	efi_status = pecoff_read_header(&context, buffer);
	if (efi_status != EFI_SUCCESS) {
		Print(L"Failed to read header\n");
		return efi_status;
	}
		
	if (context.PEHdr->Pe32.OptionalHeader.Magic == EFI_IMAGE_NT_OPTIONAL_HDR64_MAGIC) {
		checksum_ptr = &context.PEHdr->Pe32Plus.OptionalHeader.CheckSum;
		checksum_size = sizeof(context.PEHdr->Pe32Plus.OptionalHeader.CheckSum);
	} else {
		checksum_ptr = &context.PEHdr->Pe32.OptionalHeader.CheckSum;
		checksum_size = sizeof(context.PEHdr->Pe32.OptionalHeader.CheckSum);
	}

	sections = AllocatePool(context.NumberOfSections * sizeof(*sections));
	if (!sections)
		return EFI_OUT_OF_RESOURCES;

	sha256_starts(&ctx);

	/* hash start to checksum */
	hashbase = buffer;
	hashsize = checksum_ptr - buffer;
		
	sha256_update(&ctx, hashbase, hashsize);

	/* hash post-checksum to start of certificate table */
	hashbase = checksum_ptr + checksum_size;
	hashsize = (void *)context.SecDir - hashbase;

	sha256_update(&ctx, hashbase, hashsize);
		
	/* Hash end of certificate table to end of image header */
	hashbase = context.SecDir + 1;
	hashsize = context.SizeOfHeaders -
	  (int) (hashbase - buffer);

	sha256_update(&ctx, hashbase, hashsize);
	sum_of_bytes = context.SizeOfHeaders;
	section = (EFI_IMAGE_SECTION_HEADER *) ((char *)context.PEHdr + sizeof (UINT32) + sizeof (EFI_IMAGE_FILE_HEADER) + context.PEHdr->Pe32.FileHeader.SizeOfOptionalHeader);
	/* Sort the section headers by their data pointers */
	for (i = 0; i < context.NumberOfSections; i++) {
		int p = i;
		while (p > 0 && section->PointerToRawData < sections[p - 1]->PointerToRawData) {
			sections[p] = sections[p-1];
			p--;
		}
		sections[p] = section++;
	}
	/* hash the sorted sections */
	for (i = 0; i < context.NumberOfSections; i++) {
		section = sections[i];
		hashbase  = pecoff_image_address(buffer, DataSize, section->PointerToRawData);
		hashsize  = section->SizeOfRawData;
		if (hashsize == 0)
			continue;
		sha256_update(&ctx, hashbase, hashsize);
		sum_of_bytes += hashsize;
	}

	if (DataSize > sum_of_bytes + context.SecDir->Size) {
		/* stuff at end to hash */
		hashbase = buffer + sum_of_bytes;
		hashsize = (unsigned int)(DataSize - context.SecDir->Size - sum_of_bytes);
		sha256_update(&ctx, hashbase, hashsize);
	} else if (DataSize < sum_of_bytes + context.SecDir->Size) {
		/* warn but hope the checksum is right */
		Print(L"Invalid Data Size %d bytes too small\n", DataSize + context.SecDir->Size - sum_of_bytes);
	}
	sha256_finish(&ctx, hash);

	FreePool(sections);

	return EFI_SUCCESS;
}

#ifdef BUILD_EFI
void
sha256_StrCat_hash(CHAR16 *str, UINT8 hash[SHA256_DIGEST_SIZE])
{
	int i;

	for (i = 0; i < SHA256_DIGEST_SIZE; i++) {
		CHAR16 buf[10];

		SPrint(buf, sizeof(buf), L"%02x", hash[i]);
		StrCat(str, buf);
	}
}

EFI_STATUS
sha256_get_pecoff_digest(EFI_HANDLE device, CHAR16 *name, uint8 hash[SHA256_DIGEST_SIZE])
{
	EFI_STATUS efi_status;
	EFI_FILE *file;
	UINTN DataSize;
	void *buffer;
	
	efi_status = simple_file_open(device, name, &file, EFI_FILE_MODE_READ);
	if (efi_status != EFI_SUCCESS) {
		Print(L"Failed to open %s\n", name);
		return efi_status;
	}

	efi_status = simple_file_read_all(file, &DataSize, &buffer);
	if (efi_status != EFI_SUCCESS) {
		Print(L"Failed to read %s\n", name);
		goto out_close_file;
	}

	efi_status = sha256_get_pecoff_digest_mem(buffer, DataSize, hash);

	FreePool(buffer);
 out_close_file:
	simple_file_close(file);
	return efi_status;
}
#endif