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u-boot/lib/sha1.c
Andrew Duda da29f2991d rsa: Verify RSA padding programatically 
Padding verification was done against static SHA/RSA pair arrays which
take up a lot of static memory, are mostly 0xff, and cannot be reused
for additional SHA/RSA pairings. The padding can be easily computed
according to PKCS#1v2.1 as:

  EM = 0x00 || 0x01 || PS || 0x00 || T

where PS is (emLen - tLen - 3) octets of 0xff and T is DER encoding
of the hash.

Store DER prefix in checksum_algo and create rsa_verify_padding
function to handle verification of a message for any SHA/RSA pairing.

Signed-off-by: Andrew Duda <aduda@meraki.com>
Signed-off-by: aduda <aduda@meraki.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2016-11-21 14:07:30 -05:00

446 lines
9.8 KiB
C
Raw Blame History

/*
* Heiko Schocher, DENX Software Engineering, hs@denx.de.
* based on:
* FIPS-180-1 compliant SHA-1 implementation
*
* Copyright (C) 2003-2006 Christophe Devine
*
* SPDX-License-Identifier: LGPL-2.1
*/
/*
* The SHA-1 standard was published by NIST in 1993.
*
* http://www.itl.nist.gov/fipspubs/fip180-1.htm
*/
#ifndef _CRT_SECURE_NO_DEPRECATE
#define _CRT_SECURE_NO_DEPRECATE 1
#endif
#ifndef USE_HOSTCC
#include <common.h>
#include <linux/string.h>
#else
#include <string.h>
#endif /* USE_HOSTCC */
#include <watchdog.h>
#include <u-boot/sha1.h>
const uint8_t sha1_der_prefix[SHA1_DER_LEN] = {
0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2b, 0x0e,
0x03, 0x02, 0x1a, 0x05, 0x00, 0x04, 0x14
};
/*
* 32-bit integer manipulation macros (big endian)
*/
#ifndef GET_UINT32_BE
#define GET_UINT32_BE(n,b,i) { \
(n) = ( (unsigned long) (b)[(i) ] << 24 ) \
| ( (unsigned long) (b)[(i) + 1] << 16 ) \
| ( (unsigned long) (b)[(i) + 2] << 8 ) \
| ( (unsigned long) (b)[(i) + 3] ); \
}
#endif
#ifndef PUT_UINT32_BE
#define PUT_UINT32_BE(n,b,i) { \
(b)[(i) ] = (unsigned char) ( (n) >> 24 ); \
(b)[(i) + 1] = (unsigned char) ( (n) >> 16 ); \
(b)[(i) + 2] = (unsigned char) ( (n) >> 8 ); \
(b)[(i) + 3] = (unsigned char) ( (n) ); \
}
#endif
/*
* SHA-1 context setup
*/
void sha1_starts (sha1_context * ctx)
{
ctx->total[0] = 0;
ctx->total[1] = 0;
ctx->state[0] = 0x67452301;
ctx->state[1] = 0xEFCDAB89;
ctx->state[2] = 0x98BADCFE;
ctx->state[3] = 0x10325476;
ctx->state[4] = 0xC3D2E1F0;
}
static void sha1_process(sha1_context *ctx, const unsigned char data[64])
{
unsigned long temp, W[16], A, B, C, D, E;
GET_UINT32_BE (W[0], data, 0);
GET_UINT32_BE (W[1], data, 4);
GET_UINT32_BE (W[2], data, 8);
GET_UINT32_BE (W[3], data, 12);
GET_UINT32_BE (W[4], data, 16);
GET_UINT32_BE (W[5], data, 20);
GET_UINT32_BE (W[6], data, 24);
GET_UINT32_BE (W[7], data, 28);
GET_UINT32_BE (W[8], data, 32);
GET_UINT32_BE (W[9], data, 36);
GET_UINT32_BE (W[10], data, 40);
GET_UINT32_BE (W[11], data, 44);
GET_UINT32_BE (W[12], data, 48);
GET_UINT32_BE (W[13], data, 52);
GET_UINT32_BE (W[14], data, 56);
GET_UINT32_BE (W[15], data, 60);
#define S(x,n) ((x << n) | ((x & 0xFFFFFFFF) >> (32 - n)))
#define R(t) ( \
temp = W[(t - 3) & 0x0F] ^ W[(t - 8) & 0x0F] ^ \
W[(t - 14) & 0x0F] ^ W[ t & 0x0F], \
( W[t & 0x0F] = S(temp,1) ) \
)
#define P(a,b,c,d,e,x) { \
e += S(a,5) + F(b,c,d) + K + x; b = S(b,30); \
}
A = ctx->state[0];
B = ctx->state[1];
C = ctx->state[2];
D = ctx->state[3];
E = ctx->state[4];
#define F(x,y,z) (z ^ (x & (y ^ z)))
#define K 0x5A827999
P (A, B, C, D, E, W[0]);
P (E, A, B, C, D, W[1]);
P (D, E, A, B, C, W[2]);
P (C, D, E, A, B, W[3]);
P (B, C, D, E, A, W[4]);
P (A, B, C, D, E, W[5]);
P (E, A, B, C, D, W[6]);
P (D, E, A, B, C, W[7]);
P (C, D, E, A, B, W[8]);
P (B, C, D, E, A, W[9]);
P (A, B, C, D, E, W[10]);
P (E, A, B, C, D, W[11]);
P (D, E, A, B, C, W[12]);
P (C, D, E, A, B, W[13]);
P (B, C, D, E, A, W[14]);
P (A, B, C, D, E, W[15]);
P (E, A, B, C, D, R (16));
P (D, E, A, B, C, R (17));
P (C, D, E, A, B, R (18));
P (B, C, D, E, A, R (19));
#undef K
#undef F
#define F(x,y,z) (x ^ y ^ z)
#define K 0x6ED9EBA1
P (A, B, C, D, E, R (20));
P (E, A, B, C, D, R (21));
P (D, E, A, B, C, R (22));
P (C, D, E, A, B, R (23));
P (B, C, D, E, A, R (24));
P (A, B, C, D, E, R (25));
P (E, A, B, C, D, R (26));
P (D, E, A, B, C, R (27));
P (C, D, E, A, B, R (28));
P (B, C, D, E, A, R (29));
P (A, B, C, D, E, R (30));
P (E, A, B, C, D, R (31));
P (D, E, A, B, C, R (32));
P (C, D, E, A, B, R (33));
P (B, C, D, E, A, R (34));
P (A, B, C, D, E, R (35));
P (E, A, B, C, D, R (36));
P (D, E, A, B, C, R (37));
P (C, D, E, A, B, R (38));
P (B, C, D, E, A, R (39));
#undef K
#undef F
#define F(x,y,z) ((x & y) | (z & (x | y)))
#define K 0x8F1BBCDC
P (A, B, C, D, E, R (40));
P (E, A, B, C, D, R (41));
P (D, E, A, B, C, R (42));
P (C, D, E, A, B, R (43));
P (B, C, D, E, A, R (44));
P (A, B, C, D, E, R (45));
P (E, A, B, C, D, R (46));
P (D, E, A, B, C, R (47));
P (C, D, E, A, B, R (48));
P (B, C, D, E, A, R (49));
P (A, B, C, D, E, R (50));
P (E, A, B, C, D, R (51));
P (D, E, A, B, C, R (52));
P (C, D, E, A, B, R (53));
P (B, C, D, E, A, R (54));
P (A, B, C, D, E, R (55));
P (E, A, B, C, D, R (56));
P (D, E, A, B, C, R (57));
P (C, D, E, A, B, R (58));
P (B, C, D, E, A, R (59));
#undef K
#undef F
#define F(x,y,z) (x ^ y ^ z)
#define K 0xCA62C1D6
P (A, B, C, D, E, R (60));
P (E, A, B, C, D, R (61));
P (D, E, A, B, C, R (62));
P (C, D, E, A, B, R (63));
P (B, C, D, E, A, R (64));
P (A, B, C, D, E, R (65));
P (E, A, B, C, D, R (66));
P (D, E, A, B, C, R (67));
P (C, D, E, A, B, R (68));
P (B, C, D, E, A, R (69));
P (A, B, C, D, E, R (70));
P (E, A, B, C, D, R (71));
P (D, E, A, B, C, R (72));
P (C, D, E, A, B, R (73));
P (B, C, D, E, A, R (74));
P (A, B, C, D, E, R (75));
P (E, A, B, C, D, R (76));
P (D, E, A, B, C, R (77));
P (C, D, E, A, B, R (78));
P (B, C, D, E, A, R (79));
#undef K
#undef F
ctx->state[0] += A;
ctx->state[1] += B;
ctx->state[2] += C;
ctx->state[3] += D;
ctx->state[4] += E;
}
/*
* SHA-1 process buffer
*/
void sha1_update(sha1_context *ctx, const unsigned char *input,
unsigned int ilen)
{
int fill;
unsigned long left;
if (ilen <= 0)
return;
left = ctx->total[0] & 0x3F;
fill = 64 - left;
ctx->total[0] += ilen;
ctx->total[0] &= 0xFFFFFFFF;
if (ctx->total[0] < (unsigned long) ilen)
ctx->total[1]++;
if (left && ilen >= fill) {
memcpy ((void *) (ctx->buffer + left), (void *) input, fill);
sha1_process (ctx, ctx->buffer);
input += fill;
ilen -= fill;
left = 0;
}
while (ilen >= 64) {
sha1_process (ctx, input);
input += 64;
ilen -= 64;
}
if (ilen > 0) {
memcpy ((void *) (ctx->buffer + left), (void *) input, ilen);
}
}
static const unsigned char sha1_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
};
/*
* SHA-1 final digest
*/
void sha1_finish (sha1_context * ctx, unsigned char output[20])
{
unsigned long last, padn;
unsigned long high, low;
unsigned char msglen[8];
high = (ctx->total[0] >> 29)
| (ctx->total[1] << 3);
low = (ctx->total[0] << 3);
PUT_UINT32_BE (high, msglen, 0);
PUT_UINT32_BE (low, msglen, 4);
last = ctx->total[0] & 0x3F;
padn = (last < 56) ? (56 - last) : (120 - last);
sha1_update (ctx, (unsigned char *) sha1_padding, padn);
sha1_update (ctx, msglen, 8);
PUT_UINT32_BE (ctx->state[0], output, 0);
PUT_UINT32_BE (ctx->state[1], output, 4);
PUT_UINT32_BE (ctx->state[2], output, 8);
PUT_UINT32_BE (ctx->state[3], output, 12);
PUT_UINT32_BE (ctx->state[4], output, 16);
}
/*
* Output = SHA-1( input buffer )
*/
void sha1_csum(const unsigned char *input, unsigned int ilen,
unsigned char *output)
{
sha1_context ctx;
sha1_starts (&ctx);
sha1_update (&ctx, input, ilen);
sha1_finish (&ctx, output);
}
/*
* Output = SHA-1( input buffer ). Trigger the watchdog every 'chunk_sz'
* bytes of input processed.
*/
void sha1_csum_wd(const unsigned char *input, unsigned int ilen,
unsigned char *output, unsigned int chunk_sz)
{
sha1_context ctx;
#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
const unsigned char *end, *curr;
int chunk;
#endif
sha1_starts (&ctx);
#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
curr = input;
end = input + ilen;
while (curr < end) {
chunk = end - curr;
if (chunk > chunk_sz)
chunk = chunk_sz;
sha1_update (&ctx, curr, chunk);
curr += chunk;
WATCHDOG_RESET ();
}
#else
sha1_update (&ctx, input, ilen);
#endif
sha1_finish (&ctx, output);
}
/*
* Output = HMAC-SHA-1( input buffer, hmac key )
*/
void sha1_hmac(const unsigned char *key, int keylen,
const unsigned char *input, unsigned int ilen,
unsigned char *output)
{
int i;
sha1_context ctx;
unsigned char k_ipad[64];
unsigned char k_opad[64];
unsigned char tmpbuf[20];
memset (k_ipad, 0x36, 64);
memset (k_opad, 0x5C, 64);
for (i = 0; i < keylen; i++) {
if (i >= 64)
break;
k_ipad[i] ^= key[i];
k_opad[i] ^= key[i];
}
sha1_starts (&ctx);
sha1_update (&ctx, k_ipad, 64);
sha1_update (&ctx, input, ilen);
sha1_finish (&ctx, tmpbuf);
sha1_starts (&ctx);
sha1_update (&ctx, k_opad, 64);
sha1_update (&ctx, tmpbuf, 20);
sha1_finish (&ctx, output);
memset (k_ipad, 0, 64);
memset (k_opad, 0, 64);
memset (tmpbuf, 0, 20);
memset (&ctx, 0, sizeof (sha1_context));
}
#ifdef SELF_TEST
/*
* FIPS-180-1 test vectors
*/
static const char sha1_test_str[3][57] = {
{"abc"},
{"abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq"},
{""}
};
static const unsigned char sha1_test_sum[3][20] = {
{0xA9, 0x99, 0x3E, 0x36, 0x47, 0x06, 0x81, 0x6A, 0xBA, 0x3E,
0x25, 0x71, 0x78, 0x50, 0xC2, 0x6C, 0x9C, 0xD0, 0xD8, 0x9D},
{0x84, 0x98, 0x3E, 0x44, 0x1C, 0x3B, 0xD2, 0x6E, 0xBA, 0xAE,
0x4A, 0xA1, 0xF9, 0x51, 0x29, 0xE5, 0xE5, 0x46, 0x70, 0xF1},
{0x34, 0xAA, 0x97, 0x3C, 0xD4, 0xC4, 0xDA, 0xA4, 0xF6, 0x1E,
0xEB, 0x2B, 0xDB, 0xAD, 0x27, 0x31, 0x65, 0x34, 0x01, 0x6F}
};
/*
* Checkup routine
*/
int sha1_self_test (void)
{
int i, j;
unsigned char buf[1000];
unsigned char sha1sum[20];
sha1_context ctx;
for (i = 0; i < 3; i++) {
printf (" SHA-1 test #%d: ", i + 1);
sha1_starts (&ctx);
if (i < 2)
sha1_update (&ctx, (unsigned char *) sha1_test_str[i],
strlen (sha1_test_str[i]));
else {
memset (buf, 'a', 1000);
for (j = 0; j < 1000; j++)
sha1_update (&ctx, buf, 1000);
}
sha1_finish (&ctx, sha1sum);
if (memcmp (sha1sum, sha1_test_sum[i], 20) != 0) {
printf ("failed\n");
return (1);
}
printf ("passed\n");
}
printf ("\n");
return (0);
}
#else
int sha1_self_test (void)
{
return (0);
}
#endif
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