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/*
* 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