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authorNicolas Boichat <drinkcat@chromium.org>2019-05-09 14:37:08 +0900
committerCommit Bot <commit-bot@chromium.org>2020-03-25 02:13:32 +0000
commit6d2a49dc7f603551ec3d898b74b8740fe0736cd9 (patch)
tree382c127f20dfaa5a3a9655ffc9dad3714f956c01
parent509f29d6ce3d684f4c21a02f49f76e08353110f1 (diff)
downloadchrome-ec-6d2a49dc7f603551ec3d898b74b8740fe0736cd9.tar.gz
common/sha256: Move to third_party
The code originally comes from vboot_reference, and is now found on github: https://github.com/ogay/sha2 . BRANCH=none BUG=chromium:884905 TEST=make buildall -j, which also include basic tests. Change-Id: I8beac95430b2126f625a3981a9ebe038ab588212 Signed-off-by: Nicolas Boichat <drinkcat@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/1599763 Reviewed-by: Aseda Aboagye <aaboagye@chromium.org>
l---------[-rw-r--r--]common/sha256.c298
-rw-r--r--third_party/sha2/LICENSE23
-rw-r--r--third_party/sha2/METADATA16
-rw-r--r--third_party/sha2/sha256.c297
4 files changed, 337 insertions, 297 deletions
diff --git a/common/sha256.c b/common/sha256.c
index 2d6eaa43f2..8c0778c3e6 100644..120000
--- a/common/sha256.c
+++ b/common/sha256.c
@@ -1,297 +1 @@
-/* SHA-256 and SHA-512 implementation based on code by Oliver Gay
- * <olivier.gay@a3.epfl.ch> under a BSD-style license. See below.
- */
-
-/*
- * FIPS 180-2 SHA-224/256/384/512 implementation
- * Last update: 02/02/2007
- * Issue date: 04/30/2005
- *
- * Copyright (C) 2005, 2007 Olivier Gay <olivier.gay@a3.epfl.ch>
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the project nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#include "sha256.h"
-#include "util.h"
-
-#define SHFR(x, n) (x >> n)
-#define ROTR(x, n) ((x >> n) | (x << ((sizeof(x) << 3) - n)))
-#define ROTL(x, n) ((x << n) | (x >> ((sizeof(x) << 3) - n)))
-#define CH(x, y, z) ((x & y) ^ (~x & z))
-#define MAJ(x, y, z) ((x & y) ^ (x & z) ^ (y & z))
-
-#define SHA256_F1(x) (ROTR(x, 2) ^ ROTR(x, 13) ^ ROTR(x, 22))
-#define SHA256_F2(x) (ROTR(x, 6) ^ ROTR(x, 11) ^ ROTR(x, 25))
-#define SHA256_F3(x) (ROTR(x, 7) ^ ROTR(x, 18) ^ SHFR(x, 3))
-#define SHA256_F4(x) (ROTR(x, 17) ^ ROTR(x, 19) ^ SHFR(x, 10))
-
-#define UNPACK32(x, str) \
- { \
- *((str) + 3) = (uint8_t) ((x)); \
- *((str) + 2) = (uint8_t) ((x) >> 8); \
- *((str) + 1) = (uint8_t) ((x) >> 16); \
- *((str) + 0) = (uint8_t) ((x) >> 24); \
- }
-
-#define PACK32(str, x) \
- { \
- *(x) = ((uint32_t) *((str) + 3)) \
- | ((uint32_t) *((str) + 2) << 8) \
- | ((uint32_t) *((str) + 1) << 16) \
- | ((uint32_t) *((str) + 0) << 24); \
- }
-
-/* Macros used for loops unrolling */
-
-#define SHA256_SCR(i) \
- { \
- w[i] = SHA256_F4(w[i - 2]) + w[i - 7] \
- + SHA256_F3(w[i - 15]) + w[i - 16]; \
- }
-
-#define SHA256_EXP(a, b, c, d, e, f, g, h, j) \
- { \
- t1 = wv[h] + SHA256_F2(wv[e]) + CH(wv[e], wv[f], wv[g]) \
- + sha256_k[j] + w[j]; \
- t2 = SHA256_F1(wv[a]) + MAJ(wv[a], wv[b], wv[c]); \
- wv[d] += t1; \
- wv[h] = t1 + t2; \
- }
-
-static const uint32_t sha256_h0[8] = {
- 0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a,
- 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19};
-
-static const uint32_t sha256_k[64] = {
- 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
- 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
- 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
- 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
- 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
- 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
- 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
- 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
- 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
- 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
- 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
- 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
- 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
- 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
- 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
- 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2};
-
-void SHA256_init(struct sha256_ctx *ctx)
-{
- int i;
-
- for (i = 0; i < 8; i++)
- ctx->h[i] = sha256_h0[i];
-
- ctx->len = 0;
- ctx->tot_len = 0;
-}
-
-static void SHA256_transform(struct sha256_ctx *ctx, const uint8_t *message,
- unsigned int block_nb)
-{
- /* Note: this function requires a considerable amount of stack */
- uint32_t w[64];
- uint32_t wv[8];
- uint32_t t1, t2;
- const unsigned char *sub_block;
- int i, j;
-
- for (i = 0; i < (int) block_nb; i++) {
- sub_block = message + (i << 6);
-
- for (j = 0; j < 16; j++)
- PACK32(&sub_block[j << 2], &w[j]);
-
-#ifdef CONFIG_SHA256_UNROLLED
- for (j = 16; j < 64; j += 8) {
- SHA256_SCR(j);
- SHA256_SCR(j+1);
- SHA256_SCR(j+2);
- SHA256_SCR(j+3);
- SHA256_SCR(j+4);
- SHA256_SCR(j+5);
- SHA256_SCR(j+6);
- SHA256_SCR(j+7);
- }
-#else
- for (j = 16; j < 64; j++)
- SHA256_SCR(j);
-#endif
-
- for (j = 0; j < 8; j++)
- wv[j] = ctx->h[j];
-
-#ifdef CONFIG_SHA256_UNROLLED
- for (j = 0; j < 64; j += 8) {
- SHA256_EXP(0, 1, 2, 3, 4, 5, 6, 7, j);
- SHA256_EXP(7, 0, 1, 2, 3, 4, 5, 6, j+1);
- SHA256_EXP(6, 7, 0, 1, 2, 3, 4, 5, j+2);
- SHA256_EXP(5, 6, 7, 0, 1, 2, 3, 4, j+3);
- SHA256_EXP(4, 5, 6, 7, 0, 1, 2, 3, j+4);
- SHA256_EXP(3, 4, 5, 6, 7, 0, 1, 2, j+5);
- SHA256_EXP(2, 3, 4, 5, 6, 7, 0, 1, j+6);
- SHA256_EXP(1, 2, 3, 4, 5, 6, 7, 0, j+7);
- }
-#else
- for (j = 0; j < 64; j++) {
- t1 = wv[7] + SHA256_F2(wv[4]) + CH(wv[4], wv[5], wv[6])
- + sha256_k[j] + w[j];
- t2 = SHA256_F1(wv[0]) + MAJ(wv[0], wv[1], wv[2]);
- wv[7] = wv[6];
- wv[6] = wv[5];
- wv[5] = wv[4];
- wv[4] = wv[3] + t1;
- wv[3] = wv[2];
- wv[2] = wv[1];
- wv[1] = wv[0];
- wv[0] = t1 + t2;
- }
-#endif
-
- for (j = 0; j < 8; j++)
- ctx->h[j] += wv[j];
- }
-}
-
-void SHA256_update(struct sha256_ctx *ctx, const uint8_t *data, uint32_t len)
-{
- unsigned int block_nb;
- unsigned int new_len, rem_len, tmp_len;
- const uint8_t *shifted_data;
-
- tmp_len = SHA256_BLOCK_SIZE - ctx->len;
- rem_len = len < tmp_len ? len : tmp_len;
-
- memcpy(&ctx->block[ctx->len], data, rem_len);
-
- if (ctx->len + len < SHA256_BLOCK_SIZE) {
- ctx->len += len;
- return;
- }
-
- new_len = len - rem_len;
- block_nb = new_len / SHA256_BLOCK_SIZE;
-
- shifted_data = data + rem_len;
-
- SHA256_transform(ctx, ctx->block, 1);
- SHA256_transform(ctx, shifted_data, block_nb);
-
- rem_len = new_len % SHA256_BLOCK_SIZE;
-
- memcpy(ctx->block, &shifted_data[block_nb << 6], rem_len);
-
- ctx->len = rem_len;
- ctx->tot_len += (block_nb + 1) << 6;
-}
-
-/*
- * Specialized SHA256_init + SHA256_update that takes the first data block of
- * size SHA256_BLOCK_SIZE as input.
- */
-static void SHA256_init_1b(struct sha256_ctx *ctx, const uint8_t *data)
-{
- int i;
-
- for (i = 0; i < 8; i++)
- ctx->h[i] = sha256_h0[i];
-
- SHA256_transform(ctx, data, 1);
-
- ctx->len = 0;
- ctx->tot_len = SHA256_BLOCK_SIZE;
-}
-
-uint8_t *SHA256_final(struct sha256_ctx *ctx)
-{
- unsigned int block_nb;
- unsigned int pm_len;
- unsigned int len_b;
- int i;
-
- block_nb = (1 + ((SHA256_BLOCK_SIZE - 9)
- < (ctx->len % SHA256_BLOCK_SIZE)));
-
- len_b = (ctx->tot_len + ctx->len) << 3;
- pm_len = block_nb << 6;
-
- memset(ctx->block + ctx->len, 0, pm_len - ctx->len);
- ctx->block[ctx->len] = 0x80;
- UNPACK32(len_b, ctx->block + pm_len - 4);
-
- SHA256_transform(ctx, ctx->block, block_nb);
-
- for (i = 0; i < 8; i++)
- UNPACK32(ctx->h[i], &ctx->buf[i << 2]);
-
- return ctx->buf;
-}
-
-static void hmac_SHA256_step(uint8_t *output, uint8_t mask,
- const uint8_t *key, const int key_len,
- const uint8_t *data, const int data_len) {
- struct sha256_ctx ctx;
- uint8_t *key_pad = ctx.block;
- uint8_t *tmp;
- int i;
-
- /* key_pad = key (zero-padded) ^ mask */
- memset(key_pad, mask, SHA256_BLOCK_SIZE);
- for (i = 0; i < key_len; i++)
- key_pad[i] ^= key[i];
-
- /* tmp = hash(key_pad || message) */
- SHA256_init_1b(&ctx, key_pad);
- SHA256_update(&ctx, data, data_len);
- tmp = SHA256_final(&ctx);
- memcpy(output, tmp, SHA256_DIGEST_SIZE);
-}
-
-void hmac_SHA256(uint8_t *output, const uint8_t *key, const int key_len,
- const uint8_t *message, const int message_len) {
- /* This code does not support key_len > block_size. */
- ASSERT(key_len <= SHA256_BLOCK_SIZE);
-
- /*
- * i_key_pad = key (zero-padded) ^ 0x36
- * output = hash(i_key_pad || message)
- * (Use output as temporary buffer)
- */
- hmac_SHA256_step(output, 0x36, key, key_len, message, message_len);
-
- /*
- * o_key_pad = key (zero-padded) ^ 0x5c
- * output = hash(o_key_pad || output)
- */
- hmac_SHA256_step(output, 0x5c,
- key, key_len, output, SHA256_DIGEST_SIZE);
-}
+../third_party/sha2//sha256.c \ No newline at end of file
diff --git a/third_party/sha2/LICENSE b/third_party/sha2/LICENSE
new file mode 100644
index 0000000000..87e21badf3
--- /dev/null
+++ b/third_party/sha2/LICENSE
@@ -0,0 +1,23 @@
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+1. Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in the
+ documentation and/or other materials provided with the distribution.
+3. Neither the name of the project nor the names of its contributors
+ may be used to endorse or promote products derived from this software
+ without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGE. \ No newline at end of file
diff --git a/third_party/sha2/METADATA b/third_party/sha2/METADATA
new file mode 100644
index 0000000000..50b90022a9
--- /dev/null
+++ b/third_party/sha2/METADATA
@@ -0,0 +1,16 @@
+name: "SHA-256 implementation"
+description:
+ "Fast software implementation in C of the FIPS 180-2 hash algorithms"
+ "SHA-224, SHA-256, SHA-384 and SHA-512"
+
+third_party {
+ url {
+ type: GIT
+ value: "https://github.com/ogay/sha2"
+ }
+ version: "79116b5d5d449311c27a24e16c99d8bccb4d1301"
+ last_upgrade_date { year: 2014 month: 04 day: 01 }
+ license_type: NOTICE
+ local_modifications: "See git log. "
+ "Created LICENSE file."
+} \ No newline at end of file
diff --git a/third_party/sha2/sha256.c b/third_party/sha2/sha256.c
new file mode 100644
index 0000000000..2d6eaa43f2
--- /dev/null
+++ b/third_party/sha2/sha256.c
@@ -0,0 +1,297 @@
+/* SHA-256 and SHA-512 implementation based on code by Oliver Gay
+ * <olivier.gay@a3.epfl.ch> under a BSD-style license. See below.
+ */
+
+/*
+ * FIPS 180-2 SHA-224/256/384/512 implementation
+ * Last update: 02/02/2007
+ * Issue date: 04/30/2005
+ *
+ * Copyright (C) 2005, 2007 Olivier Gay <olivier.gay@a3.epfl.ch>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the project nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include "sha256.h"
+#include "util.h"
+
+#define SHFR(x, n) (x >> n)
+#define ROTR(x, n) ((x >> n) | (x << ((sizeof(x) << 3) - n)))
+#define ROTL(x, n) ((x << n) | (x >> ((sizeof(x) << 3) - n)))
+#define CH(x, y, z) ((x & y) ^ (~x & z))
+#define MAJ(x, y, z) ((x & y) ^ (x & z) ^ (y & z))
+
+#define SHA256_F1(x) (ROTR(x, 2) ^ ROTR(x, 13) ^ ROTR(x, 22))
+#define SHA256_F2(x) (ROTR(x, 6) ^ ROTR(x, 11) ^ ROTR(x, 25))
+#define SHA256_F3(x) (ROTR(x, 7) ^ ROTR(x, 18) ^ SHFR(x, 3))
+#define SHA256_F4(x) (ROTR(x, 17) ^ ROTR(x, 19) ^ SHFR(x, 10))
+
+#define UNPACK32(x, str) \
+ { \
+ *((str) + 3) = (uint8_t) ((x)); \
+ *((str) + 2) = (uint8_t) ((x) >> 8); \
+ *((str) + 1) = (uint8_t) ((x) >> 16); \
+ *((str) + 0) = (uint8_t) ((x) >> 24); \
+ }
+
+#define PACK32(str, x) \
+ { \
+ *(x) = ((uint32_t) *((str) + 3)) \
+ | ((uint32_t) *((str) + 2) << 8) \
+ | ((uint32_t) *((str) + 1) << 16) \
+ | ((uint32_t) *((str) + 0) << 24); \
+ }
+
+/* Macros used for loops unrolling */
+
+#define SHA256_SCR(i) \
+ { \
+ w[i] = SHA256_F4(w[i - 2]) + w[i - 7] \
+ + SHA256_F3(w[i - 15]) + w[i - 16]; \
+ }
+
+#define SHA256_EXP(a, b, c, d, e, f, g, h, j) \
+ { \
+ t1 = wv[h] + SHA256_F2(wv[e]) + CH(wv[e], wv[f], wv[g]) \
+ + sha256_k[j] + w[j]; \
+ t2 = SHA256_F1(wv[a]) + MAJ(wv[a], wv[b], wv[c]); \
+ wv[d] += t1; \
+ wv[h] = t1 + t2; \
+ }
+
+static const uint32_t sha256_h0[8] = {
+ 0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a,
+ 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19};
+
+static const uint32_t sha256_k[64] = {
+ 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
+ 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
+ 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
+ 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
+ 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
+ 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
+ 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
+ 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
+ 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
+ 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
+ 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
+ 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
+ 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
+ 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
+ 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
+ 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2};
+
+void SHA256_init(struct sha256_ctx *ctx)
+{
+ int i;
+
+ for (i = 0; i < 8; i++)
+ ctx->h[i] = sha256_h0[i];
+
+ ctx->len = 0;
+ ctx->tot_len = 0;
+}
+
+static void SHA256_transform(struct sha256_ctx *ctx, const uint8_t *message,
+ unsigned int block_nb)
+{
+ /* Note: this function requires a considerable amount of stack */
+ uint32_t w[64];
+ uint32_t wv[8];
+ uint32_t t1, t2;
+ const unsigned char *sub_block;
+ int i, j;
+
+ for (i = 0; i < (int) block_nb; i++) {
+ sub_block = message + (i << 6);
+
+ for (j = 0; j < 16; j++)
+ PACK32(&sub_block[j << 2], &w[j]);
+
+#ifdef CONFIG_SHA256_UNROLLED
+ for (j = 16; j < 64; j += 8) {
+ SHA256_SCR(j);
+ SHA256_SCR(j+1);
+ SHA256_SCR(j+2);
+ SHA256_SCR(j+3);
+ SHA256_SCR(j+4);
+ SHA256_SCR(j+5);
+ SHA256_SCR(j+6);
+ SHA256_SCR(j+7);
+ }
+#else
+ for (j = 16; j < 64; j++)
+ SHA256_SCR(j);
+#endif
+
+ for (j = 0; j < 8; j++)
+ wv[j] = ctx->h[j];
+
+#ifdef CONFIG_SHA256_UNROLLED
+ for (j = 0; j < 64; j += 8) {
+ SHA256_EXP(0, 1, 2, 3, 4, 5, 6, 7, j);
+ SHA256_EXP(7, 0, 1, 2, 3, 4, 5, 6, j+1);
+ SHA256_EXP(6, 7, 0, 1, 2, 3, 4, 5, j+2);
+ SHA256_EXP(5, 6, 7, 0, 1, 2, 3, 4, j+3);
+ SHA256_EXP(4, 5, 6, 7, 0, 1, 2, 3, j+4);
+ SHA256_EXP(3, 4, 5, 6, 7, 0, 1, 2, j+5);
+ SHA256_EXP(2, 3, 4, 5, 6, 7, 0, 1, j+6);
+ SHA256_EXP(1, 2, 3, 4, 5, 6, 7, 0, j+7);
+ }
+#else
+ for (j = 0; j < 64; j++) {
+ t1 = wv[7] + SHA256_F2(wv[4]) + CH(wv[4], wv[5], wv[6])
+ + sha256_k[j] + w[j];
+ t2 = SHA256_F1(wv[0]) + MAJ(wv[0], wv[1], wv[2]);
+ wv[7] = wv[6];
+ wv[6] = wv[5];
+ wv[5] = wv[4];
+ wv[4] = wv[3] + t1;
+ wv[3] = wv[2];
+ wv[2] = wv[1];
+ wv[1] = wv[0];
+ wv[0] = t1 + t2;
+ }
+#endif
+
+ for (j = 0; j < 8; j++)
+ ctx->h[j] += wv[j];
+ }
+}
+
+void SHA256_update(struct sha256_ctx *ctx, const uint8_t *data, uint32_t len)
+{
+ unsigned int block_nb;
+ unsigned int new_len, rem_len, tmp_len;
+ const uint8_t *shifted_data;
+
+ tmp_len = SHA256_BLOCK_SIZE - ctx->len;
+ rem_len = len < tmp_len ? len : tmp_len;
+
+ memcpy(&ctx->block[ctx->len], data, rem_len);
+
+ if (ctx->len + len < SHA256_BLOCK_SIZE) {
+ ctx->len += len;
+ return;
+ }
+
+ new_len = len - rem_len;
+ block_nb = new_len / SHA256_BLOCK_SIZE;
+
+ shifted_data = data + rem_len;
+
+ SHA256_transform(ctx, ctx->block, 1);
+ SHA256_transform(ctx, shifted_data, block_nb);
+
+ rem_len = new_len % SHA256_BLOCK_SIZE;
+
+ memcpy(ctx->block, &shifted_data[block_nb << 6], rem_len);
+
+ ctx->len = rem_len;
+ ctx->tot_len += (block_nb + 1) << 6;
+}
+
+/*
+ * Specialized SHA256_init + SHA256_update that takes the first data block of
+ * size SHA256_BLOCK_SIZE as input.
+ */
+static void SHA256_init_1b(struct sha256_ctx *ctx, const uint8_t *data)
+{
+ int i;
+
+ for (i = 0; i < 8; i++)
+ ctx->h[i] = sha256_h0[i];
+
+ SHA256_transform(ctx, data, 1);
+
+ ctx->len = 0;
+ ctx->tot_len = SHA256_BLOCK_SIZE;
+}
+
+uint8_t *SHA256_final(struct sha256_ctx *ctx)
+{
+ unsigned int block_nb;
+ unsigned int pm_len;
+ unsigned int len_b;
+ int i;
+
+ block_nb = (1 + ((SHA256_BLOCK_SIZE - 9)
+ < (ctx->len % SHA256_BLOCK_SIZE)));
+
+ len_b = (ctx->tot_len + ctx->len) << 3;
+ pm_len = block_nb << 6;
+
+ memset(ctx->block + ctx->len, 0, pm_len - ctx->len);
+ ctx->block[ctx->len] = 0x80;
+ UNPACK32(len_b, ctx->block + pm_len - 4);
+
+ SHA256_transform(ctx, ctx->block, block_nb);
+
+ for (i = 0; i < 8; i++)
+ UNPACK32(ctx->h[i], &ctx->buf[i << 2]);
+
+ return ctx->buf;
+}
+
+static void hmac_SHA256_step(uint8_t *output, uint8_t mask,
+ const uint8_t *key, const int key_len,
+ const uint8_t *data, const int data_len) {
+ struct sha256_ctx ctx;
+ uint8_t *key_pad = ctx.block;
+ uint8_t *tmp;
+ int i;
+
+ /* key_pad = key (zero-padded) ^ mask */
+ memset(key_pad, mask, SHA256_BLOCK_SIZE);
+ for (i = 0; i < key_len; i++)
+ key_pad[i] ^= key[i];
+
+ /* tmp = hash(key_pad || message) */
+ SHA256_init_1b(&ctx, key_pad);
+ SHA256_update(&ctx, data, data_len);
+ tmp = SHA256_final(&ctx);
+ memcpy(output, tmp, SHA256_DIGEST_SIZE);
+}
+
+void hmac_SHA256(uint8_t *output, const uint8_t *key, const int key_len,
+ const uint8_t *message, const int message_len) {
+ /* This code does not support key_len > block_size. */
+ ASSERT(key_len <= SHA256_BLOCK_SIZE);
+
+ /*
+ * i_key_pad = key (zero-padded) ^ 0x36
+ * output = hash(i_key_pad || message)
+ * (Use output as temporary buffer)
+ */
+ hmac_SHA256_step(output, 0x36, key, key_len, message, message_len);
+
+ /*
+ * o_key_pad = key (zero-padded) ^ 0x5c
+ * output = hash(o_key_pad || output)
+ */
+ hmac_SHA256_step(output, 0x5c,
+ key, key_len, output, SHA256_DIGEST_SIZE);
+}