lib/sha256.c - pub/scm/linux/kernel/git/jejb/efitools - Git at Google

 /*
  *  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>

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

 #ifndef BUILD_EFI
 #include <stdio.h>
 #define Print(...) printf("%ls", __VA_ARGS__)
 #define AllocatePool(x) malloc(x)
 #define CopyMem(d, s, l) memcpy(d, s, l)
 #define ZeroMem(s, l) memset(s, 0, l)
 #define FreePool(s) free(s)
 #endif

 #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  = (unsigned int) ALIGN_VALUE(section->SizeOfRawData,
 						       context.FileAlignment);
 		if (hashsize == 0)
 			continue;
 		sha256_update(&ctx, hashbase, hashsize);
 		sum_of_bytes += hashsize;
 	}

 	if (DataSize > sum_of_bytes) {
 		/* 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);
 	}
 	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
	/*
	* 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>

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

	#ifndef BUILD_EFI
	#include <stdio.h>
	#define Print(...) printf("%ls", __VA_ARGS__)
	#define AllocatePool(x) malloc(x)
	#define CopyMem(d, s, l) memcpy(d, s, l)
	#define ZeroMem(s, l) memset(s, 0, l)
	#define FreePool(s) free(s)
	#endif

	#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 = (unsigned int) ALIGN_VALUE(section->SizeOfRawData,
	context.FileAlignment);
	if (hashsize == 0)
	continue;
	sha256_update(&ctx, hashbase, hashsize);
	sum_of_bytes += hashsize;
	}

	if (DataSize > sum_of_bytes) {
	/* 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);
	}
	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