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linux/lib/sha256.c

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purgatory/sha256: provide implementation of sha256 in purgaotory context Next two patches provide code for purgatory. This is a code which does not link against the kernel and runs stand alone. This code runs between two kernels. One of the primary purpose of this code is to verify the digest of newly loaded kernel and making sure it matches the digest computed at kernel load time. We use sha256 for calculating digest of kexec segmetns. Purgatory can't use stanard crypto API as that API is not available in purgatory context. Hence, I have copied code from crypto/sha256_generic.c and compiled it with purgaotry code so that it could be used. I could not #include sha256_generic.c file here as some of the function signature requiered little tweaking. Original functions work with crypto API but these ones don't So instead of doing #include on sha256_generic.c I just copied relevant portions of code into arch/x86/purgatory/sha256.c. Now we shouldn't have to touch this code at all. Do let me know if there are better ways to handle it. This patch does not enable compiling of this code. That happens in next patch. I wanted to highlight this change in a separate patch for easy review. Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Cc: Borislav Petkov <bp@suse.de> Cc: Michael Kerrisk <mtk.manpages@gmail.com> Cc: Yinghai Lu <yinghai@kernel.org> Cc: Eric Biederman <ebiederm@xmission.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Matthew Garrett <mjg59@srcf.ucam.org> Cc: Greg Kroah-Hartman <greg@kroah.com> Cc: Dave Young <dyoung@redhat.com> Cc: WANG Chao <chaowang@redhat.com> Cc: Baoquan He <bhe@redhat.com> Cc: Andy Lutomirski <luto@amacapital.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-08-08 21:25:59 +00:00
/*
* SHA-256, as specified in
* http://csrc.nist.gov/groups/STM/cavp/documents/shs/sha256-384-512.pdf
*
* SHA-256 code by Jean-Luc Cooke <jlcooke@certainkey.com>.
*
* Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
* Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
* Copyright (c) 2014 Red Hat Inc.
*
* 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.
*/
#include <linux/bitops.h>
kernel/kexec_file.c: move purgatories sha256 to common code The code to verify the new kernels sha digest is applicable for all architectures. Move it to common code. One problem is the string.c implementation on x86. Currently sha256 includes x86/boot/string.h which defines memcpy and memset to be gcc builtins. By moving the sha256 implementation to common code and changing the include to linux/string.h both functions are no longer defined. Thus definitions have to be provided in x86/purgatory/string.c Link: http://lkml.kernel.org/r/20180321112751.22196-12-prudo@linux.vnet.ibm.com Signed-off-by: Philipp Rudo <prudo@linux.vnet.ibm.com> Acked-by: Dave Young <dyoung@redhat.com> Cc: AKASHI Takahiro <takahiro.akashi@linaro.org> Cc: Eric Biederman <ebiederm@xmission.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com> Cc: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2018-04-13 22:36:46 +00:00
#include <linux/sha256.h>
#include <linux/string.h>
purgatory/sha256: provide implementation of sha256 in purgaotory context Next two patches provide code for purgatory. This is a code which does not link against the kernel and runs stand alone. This code runs between two kernels. One of the primary purpose of this code is to verify the digest of newly loaded kernel and making sure it matches the digest computed at kernel load time. We use sha256 for calculating digest of kexec segmetns. Purgatory can't use stanard crypto API as that API is not available in purgatory context. Hence, I have copied code from crypto/sha256_generic.c and compiled it with purgaotry code so that it could be used. I could not #include sha256_generic.c file here as some of the function signature requiered little tweaking. Original functions work with crypto API but these ones don't So instead of doing #include on sha256_generic.c I just copied relevant portions of code into arch/x86/purgatory/sha256.c. Now we shouldn't have to touch this code at all. Do let me know if there are better ways to handle it. This patch does not enable compiling of this code. That happens in next patch. I wanted to highlight this change in a separate patch for easy review. Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Cc: Borislav Petkov <bp@suse.de> Cc: Michael Kerrisk <mtk.manpages@gmail.com> Cc: Yinghai Lu <yinghai@kernel.org> Cc: Eric Biederman <ebiederm@xmission.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Matthew Garrett <mjg59@srcf.ucam.org> Cc: Greg Kroah-Hartman <greg@kroah.com> Cc: Dave Young <dyoung@redhat.com> Cc: WANG Chao <chaowang@redhat.com> Cc: Baoquan He <bhe@redhat.com> Cc: Andy Lutomirski <luto@amacapital.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-08-08 21:25:59 +00:00
#include <asm/byteorder.h>
static inline u32 Ch(u32 x, u32 y, u32 z)
{
return z ^ (x & (y ^ z));
}
static inline u32 Maj(u32 x, u32 y, u32 z)
{
return (x & y) | (z & (x | y));
}
#define e0(x) (ror32(x, 2) ^ ror32(x, 13) ^ ror32(x, 22))
#define e1(x) (ror32(x, 6) ^ ror32(x, 11) ^ ror32(x, 25))
#define s0(x) (ror32(x, 7) ^ ror32(x, 18) ^ (x >> 3))
#define s1(x) (ror32(x, 17) ^ ror32(x, 19) ^ (x >> 10))
static inline void LOAD_OP(int I, u32 *W, const u8 *input)
{
W[I] = __be32_to_cpu(((__be32 *)(input))[I]);
}
static inline void BLEND_OP(int I, u32 *W)
{
W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16];
}
static void sha256_transform(u32 *state, const u8 *input)
{
u32 a, b, c, d, e, f, g, h, t1, t2;
u32 W[64];
int i;
/* load the input */
for (i = 0; i < 16; i++)
LOAD_OP(i, W, input);
/* now blend */
for (i = 16; i < 64; i++)
BLEND_OP(i, W);
/* load the state into our registers */
a = state[0]; b = state[1]; c = state[2]; d = state[3];
e = state[4]; f = state[5]; g = state[6]; h = state[7];
/* now iterate */
t1 = h + e1(e) + Ch(e, f, g) + 0x428a2f98 + W[0];
t2 = e0(a) + Maj(a, b, c); d += t1; h = t1 + t2;
t1 = g + e1(d) + Ch(d, e, f) + 0x71374491 + W[1];
t2 = e0(h) + Maj(h, a, b); c += t1; g = t1 + t2;
t1 = f + e1(c) + Ch(c, d, e) + 0xb5c0fbcf + W[2];
t2 = e0(g) + Maj(g, h, a); b += t1; f = t1 + t2;
t1 = e + e1(b) + Ch(b, c, d) + 0xe9b5dba5 + W[3];
t2 = e0(f) + Maj(f, g, h); a += t1; e = t1 + t2;
t1 = d + e1(a) + Ch(a, b, c) + 0x3956c25b + W[4];
t2 = e0(e) + Maj(e, f, g); h += t1; d = t1 + t2;
t1 = c + e1(h) + Ch(h, a, b) + 0x59f111f1 + W[5];
t2 = e0(d) + Maj(d, e, f); g += t1; c = t1 + t2;
t1 = b + e1(g) + Ch(g, h, a) + 0x923f82a4 + W[6];
t2 = e0(c) + Maj(c, d, e); f += t1; b = t1 + t2;
t1 = a + e1(f) + Ch(f, g, h) + 0xab1c5ed5 + W[7];
t2 = e0(b) + Maj(b, c, d); e += t1; a = t1 + t2;
t1 = h + e1(e) + Ch(e, f, g) + 0xd807aa98 + W[8];
t2 = e0(a) + Maj(a, b, c); d += t1; h = t1 + t2;
t1 = g + e1(d) + Ch(d, e, f) + 0x12835b01 + W[9];
t2 = e0(h) + Maj(h, a, b); c += t1; g = t1 + t2;
t1 = f + e1(c) + Ch(c, d, e) + 0x243185be + W[10];
t2 = e0(g) + Maj(g, h, a); b += t1; f = t1 + t2;
t1 = e + e1(b) + Ch(b, c, d) + 0x550c7dc3 + W[11];
t2 = e0(f) + Maj(f, g, h); a += t1; e = t1 + t2;
t1 = d + e1(a) + Ch(a, b, c) + 0x72be5d74 + W[12];
t2 = e0(e) + Maj(e, f, g); h += t1; d = t1 + t2;
t1 = c + e1(h) + Ch(h, a, b) + 0x80deb1fe + W[13];
t2 = e0(d) + Maj(d, e, f); g += t1; c = t1 + t2;
t1 = b + e1(g) + Ch(g, h, a) + 0x9bdc06a7 + W[14];
t2 = e0(c) + Maj(c, d, e); f += t1; b = t1 + t2;
t1 = a + e1(f) + Ch(f, g, h) + 0xc19bf174 + W[15];
t2 = e0(b) + Maj(b, c, d); e += t1; a = t1+t2;
t1 = h + e1(e) + Ch(e, f, g) + 0xe49b69c1 + W[16];
t2 = e0(a) + Maj(a, b, c); d += t1; h = t1+t2;
t1 = g + e1(d) + Ch(d, e, f) + 0xefbe4786 + W[17];
t2 = e0(h) + Maj(h, a, b); c += t1; g = t1+t2;
t1 = f + e1(c) + Ch(c, d, e) + 0x0fc19dc6 + W[18];
t2 = e0(g) + Maj(g, h, a); b += t1; f = t1+t2;
t1 = e + e1(b) + Ch(b, c, d) + 0x240ca1cc + W[19];
t2 = e0(f) + Maj(f, g, h); a += t1; e = t1+t2;
t1 = d + e1(a) + Ch(a, b, c) + 0x2de92c6f + W[20];
t2 = e0(e) + Maj(e, f, g); h += t1; d = t1+t2;
t1 = c + e1(h) + Ch(h, a, b) + 0x4a7484aa + W[21];
t2 = e0(d) + Maj(d, e, f); g += t1; c = t1+t2;
t1 = b + e1(g) + Ch(g, h, a) + 0x5cb0a9dc + W[22];
t2 = e0(c) + Maj(c, d, e); f += t1; b = t1+t2;
t1 = a + e1(f) + Ch(f, g, h) + 0x76f988da + W[23];
t2 = e0(b) + Maj(b, c, d); e += t1; a = t1+t2;
t1 = h + e1(e) + Ch(e, f, g) + 0x983e5152 + W[24];
t2 = e0(a) + Maj(a, b, c); d += t1; h = t1+t2;
t1 = g + e1(d) + Ch(d, e, f) + 0xa831c66d + W[25];
t2 = e0(h) + Maj(h, a, b); c += t1; g = t1+t2;
t1 = f + e1(c) + Ch(c, d, e) + 0xb00327c8 + W[26];
t2 = e0(g) + Maj(g, h, a); b += t1; f = t1+t2;
t1 = e + e1(b) + Ch(b, c, d) + 0xbf597fc7 + W[27];
t2 = e0(f) + Maj(f, g, h); a += t1; e = t1+t2;
t1 = d + e1(a) + Ch(a, b, c) + 0xc6e00bf3 + W[28];
t2 = e0(e) + Maj(e, f, g); h += t1; d = t1+t2;
t1 = c + e1(h) + Ch(h, a, b) + 0xd5a79147 + W[29];
t2 = e0(d) + Maj(d, e, f); g += t1; c = t1+t2;
t1 = b + e1(g) + Ch(g, h, a) + 0x06ca6351 + W[30];
t2 = e0(c) + Maj(c, d, e); f += t1; b = t1+t2;
t1 = a + e1(f) + Ch(f, g, h) + 0x14292967 + W[31];
t2 = e0(b) + Maj(b, c, d); e += t1; a = t1+t2;
t1 = h + e1(e) + Ch(e, f, g) + 0x27b70a85 + W[32];
t2 = e0(a) + Maj(a, b, c); d += t1; h = t1+t2;
t1 = g + e1(d) + Ch(d, e, f) + 0x2e1b2138 + W[33];
t2 = e0(h) + Maj(h, a, b); c += t1; g = t1+t2;
t1 = f + e1(c) + Ch(c, d, e) + 0x4d2c6dfc + W[34];
t2 = e0(g) + Maj(g, h, a); b += t1; f = t1+t2;
t1 = e + e1(b) + Ch(b, c, d) + 0x53380d13 + W[35];
t2 = e0(f) + Maj(f, g, h); a += t1; e = t1+t2;
t1 = d + e1(a) + Ch(a, b, c) + 0x650a7354 + W[36];
t2 = e0(e) + Maj(e, f, g); h += t1; d = t1+t2;
t1 = c + e1(h) + Ch(h, a, b) + 0x766a0abb + W[37];
t2 = e0(d) + Maj(d, e, f); g += t1; c = t1+t2;
t1 = b + e1(g) + Ch(g, h, a) + 0x81c2c92e + W[38];
t2 = e0(c) + Maj(c, d, e); f += t1; b = t1+t2;
t1 = a + e1(f) + Ch(f, g, h) + 0x92722c85 + W[39];
t2 = e0(b) + Maj(b, c, d); e += t1; a = t1+t2;
t1 = h + e1(e) + Ch(e, f, g) + 0xa2bfe8a1 + W[40];
t2 = e0(a) + Maj(a, b, c); d += t1; h = t1+t2;
t1 = g + e1(d) + Ch(d, e, f) + 0xa81a664b + W[41];
t2 = e0(h) + Maj(h, a, b); c += t1; g = t1+t2;
t1 = f + e1(c) + Ch(c, d, e) + 0xc24b8b70 + W[42];
t2 = e0(g) + Maj(g, h, a); b += t1; f = t1+t2;
t1 = e + e1(b) + Ch(b, c, d) + 0xc76c51a3 + W[43];
t2 = e0(f) + Maj(f, g, h); a += t1; e = t1+t2;
t1 = d + e1(a) + Ch(a, b, c) + 0xd192e819 + W[44];
t2 = e0(e) + Maj(e, f, g); h += t1; d = t1+t2;
t1 = c + e1(h) + Ch(h, a, b) + 0xd6990624 + W[45];
t2 = e0(d) + Maj(d, e, f); g += t1; c = t1+t2;
t1 = b + e1(g) + Ch(g, h, a) + 0xf40e3585 + W[46];
t2 = e0(c) + Maj(c, d, e); f += t1; b = t1+t2;
t1 = a + e1(f) + Ch(f, g, h) + 0x106aa070 + W[47];
t2 = e0(b) + Maj(b, c, d); e += t1; a = t1+t2;
t1 = h + e1(e) + Ch(e, f, g) + 0x19a4c116 + W[48];
t2 = e0(a) + Maj(a, b, c); d += t1; h = t1+t2;
t1 = g + e1(d) + Ch(d, e, f) + 0x1e376c08 + W[49];
t2 = e0(h) + Maj(h, a, b); c += t1; g = t1+t2;
t1 = f + e1(c) + Ch(c, d, e) + 0x2748774c + W[50];
t2 = e0(g) + Maj(g, h, a); b += t1; f = t1+t2;
t1 = e + e1(b) + Ch(b, c, d) + 0x34b0bcb5 + W[51];
t2 = e0(f) + Maj(f, g, h); a += t1; e = t1+t2;
t1 = d + e1(a) + Ch(a, b, c) + 0x391c0cb3 + W[52];
t2 = e0(e) + Maj(e, f, g); h += t1; d = t1+t2;
t1 = c + e1(h) + Ch(h, a, b) + 0x4ed8aa4a + W[53];
t2 = e0(d) + Maj(d, e, f); g += t1; c = t1+t2;
t1 = b + e1(g) + Ch(g, h, a) + 0x5b9cca4f + W[54];
t2 = e0(c) + Maj(c, d, e); f += t1; b = t1+t2;
t1 = a + e1(f) + Ch(f, g, h) + 0x682e6ff3 + W[55];
t2 = e0(b) + Maj(b, c, d); e += t1; a = t1+t2;
t1 = h + e1(e) + Ch(e, f, g) + 0x748f82ee + W[56];
t2 = e0(a) + Maj(a, b, c); d += t1; h = t1+t2;
t1 = g + e1(d) + Ch(d, e, f) + 0x78a5636f + W[57];
t2 = e0(h) + Maj(h, a, b); c += t1; g = t1+t2;
t1 = f + e1(c) + Ch(c, d, e) + 0x84c87814 + W[58];
t2 = e0(g) + Maj(g, h, a); b += t1; f = t1+t2;
t1 = e + e1(b) + Ch(b, c, d) + 0x8cc70208 + W[59];
t2 = e0(f) + Maj(f, g, h); a += t1; e = t1+t2;
t1 = d + e1(a) + Ch(a, b, c) + 0x90befffa + W[60];
t2 = e0(e) + Maj(e, f, g); h += t1; d = t1+t2;
t1 = c + e1(h) + Ch(h, a, b) + 0xa4506ceb + W[61];
t2 = e0(d) + Maj(d, e, f); g += t1; c = t1+t2;
t1 = b + e1(g) + Ch(g, h, a) + 0xbef9a3f7 + W[62];
t2 = e0(c) + Maj(c, d, e); f += t1; b = t1+t2;
t1 = a + e1(f) + Ch(f, g, h) + 0xc67178f2 + W[63];
t2 = e0(b) + Maj(b, c, d); e += t1; a = t1+t2;
state[0] += a; state[1] += b; state[2] += c; state[3] += d;
state[4] += e; state[5] += f; state[6] += g; state[7] += h;
/* clear any sensitive info... */
a = b = c = d = e = f = g = h = t1 = t2 = 0;
memset(W, 0, 64 * sizeof(u32));
}
int sha256_init(struct sha256_state *sctx)
{
sctx->state[0] = SHA256_H0;
sctx->state[1] = SHA256_H1;
sctx->state[2] = SHA256_H2;
sctx->state[3] = SHA256_H3;
sctx->state[4] = SHA256_H4;
sctx->state[5] = SHA256_H5;
sctx->state[6] = SHA256_H6;
sctx->state[7] = SHA256_H7;
sctx->count = 0;
return 0;
}
int sha256_update(struct sha256_state *sctx, const u8 *data, unsigned int len)
{
unsigned int partial, done;
const u8 *src;
partial = sctx->count & 0x3f;
sctx->count += len;
done = 0;
src = data;
if ((partial + len) > 63) {
if (partial) {
done = -partial;
memcpy(sctx->buf + partial, data, done + 64);
src = sctx->buf;
}
do {
sha256_transform(sctx->state, src);
done += 64;
src = data + done;
} while (done + 63 < len);
partial = 0;
}
memcpy(sctx->buf + partial, src, len - done);
return 0;
}
int sha256_final(struct sha256_state *sctx, u8 *out)
{
__be32 *dst = (__be32 *)out;
__be64 bits;
unsigned int index, pad_len;
int i;
static const u8 padding[64] = { 0x80, };
/* Save number of bits */
bits = cpu_to_be64(sctx->count << 3);
/* Pad out to 56 mod 64. */
index = sctx->count & 0x3f;
pad_len = (index < 56) ? (56 - index) : ((64+56) - index);
sha256_update(sctx, padding, pad_len);
/* Append length (before padding) */
sha256_update(sctx, (const u8 *)&bits, sizeof(bits));
/* Store state in digest */
for (i = 0; i < 8; i++)
dst[i] = cpu_to_be32(sctx->state[i]);
/* Zeroize sensitive information. */
memset(sctx, 0, sizeof(*sctx));
return 0;
}
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