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authorPhilipp Rudo <prudo@linux.vnet.ibm.com>2018-04-14 01:36:46 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2018-04-14 03:10:28 +0300
commitdf6f2801f511b07c08c110fe9f047a34cb40286f (patch)
tree71949b732c86f7ee9337adc4490b76ffdf292c0d /lib
parent3be3f61d25e04ecf90d65d52fad632af5ba8805b (diff)
downloadlinux-df6f2801f511b07c08c110fe9f047a34cb40286f.tar.xz
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>
Diffstat (limited to 'lib')
-rw-r--r--lib/sha256.c283
1 files changed, 283 insertions, 0 deletions
diff --git a/lib/sha256.c b/lib/sha256.c
new file mode 100644
index 000000000000..4400c832e2aa
--- /dev/null
+++ b/lib/sha256.c
@@ -0,0 +1,283 @@
+/*
+ * 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>
+#include <linux/sha256.h>
+#include <linux/string.h>
+#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;
+}