We need to calculate HMAC-256SHA as part of the protocol. To avoid making the daemon dependent on QEMU's internal crypto library we import the functions here.
Signed-off-by: Alex Bennée alex.bennee@linaro.org --- tools/vhost-user-rpmb/hmac_sha256.h | 87 ++++++++ tools/vhost-user-rpmb/hmac_sha256.c | 331 ++++++++++++++++++++++++++++ tools/vhost-user-rpmb/meson.build | 3 +- 3 files changed, 420 insertions(+), 1 deletion(-) create mode 100644 tools/vhost-user-rpmb/hmac_sha256.h create mode 100644 tools/vhost-user-rpmb/hmac_sha256.c
diff --git a/tools/vhost-user-rpmb/hmac_sha256.h b/tools/vhost-user-rpmb/hmac_sha256.h new file mode 100644 index 000000000000..e67a5baedecd --- /dev/null +++ b/tools/vhost-user-rpmb/hmac_sha256.h @@ -0,0 +1,87 @@ +/* + * HMAC-SHA-256 implementation + * Last update: 06/15/2005 + * Issue date: 06/15/2005 + * + * Copyright (C) 2005 Olivier Gay olivier.gay@a3.epfl.ch + * All rights reserved. + * + * Copyright (c) 2016, 2020, Linaro Limited + * 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. + */ + +#ifndef HMAC_SHA256_H +#define HMAC_SHA256_H + +#define SHA256_DIGEST_SIZE ( 256 / 8) +#define SHA256_BLOCK_SIZE ( 512 / 8) + +#ifndef SHA2_TYPES +#define SHA2_TYPES +typedef unsigned char uint8; +typedef unsigned int uint32; +typedef unsigned long long uint64; +#endif + +typedef struct { + unsigned int tot_len; + unsigned int len; + unsigned char block[2 * SHA256_BLOCK_SIZE]; + uint32 h[8]; +} sha256_ctx; + +void sha256_init(sha256_ctx * ctx); +void sha256_update(sha256_ctx *ctx, const unsigned char *message, + unsigned int len); +void sha256_final(sha256_ctx *ctx, unsigned char *digest); +void sha256(const unsigned char *message, unsigned int len, + unsigned char *digest); + +typedef struct { + sha256_ctx ctx_inside; + sha256_ctx ctx_outside; + + /* for hmac_reinit */ + sha256_ctx ctx_inside_reinit; + sha256_ctx ctx_outside_reinit; + + unsigned char block_ipad[SHA256_BLOCK_SIZE]; + unsigned char block_opad[SHA256_BLOCK_SIZE]; +} hmac_sha256_ctx; + +void hmac_sha256_init(hmac_sha256_ctx *ctx, const unsigned char *key, + unsigned int key_size); +void hmac_sha256_reinit(hmac_sha256_ctx *ctx); +void hmac_sha256_update(hmac_sha256_ctx *ctx, const unsigned char *message, + unsigned int message_len); +void hmac_sha256_final(hmac_sha256_ctx *ctx, unsigned char *mac, + unsigned int mac_size); +void hmac_sha256(const unsigned char *key, unsigned int key_size, + const unsigned char *message, unsigned int message_len, + unsigned char *mac, unsigned mac_size); + +#endif /* !HMAC_SHA256_H */ diff --git a/tools/vhost-user-rpmb/hmac_sha256.c b/tools/vhost-user-rpmb/hmac_sha256.c new file mode 100644 index 000000000000..f6640a46c616 --- /dev/null +++ b/tools/vhost-user-rpmb/hmac_sha256.c @@ -0,0 +1,331 @@ +/* + * HMAC-SHA-256 implementation + * Last update: 06/15/2005 + * Issue date: 06/15/2005 + * + * Copyright (C) 2005 Olivier Gay olivier.gay@a3.epfl.ch + * All rights reserved. + * + * Copyright (c) 2016, 2020 Linaro Limited + * 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 <string.h> + +#include "hmac_sha256.h" + +/* SHA256 functions */ + +#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) ((x) ); \ + *((str) + 2) = (uint8) ((x) >> 8); \ + *((str) + 1) = (uint8) ((x) >> 16); \ + *((str) + 0) = (uint8) ((x) >> 24); \ +} + +#define PACK32(str, x) \ +{ \ + *(x) = ((uint32) *((str) + 3) ) \ + | ((uint32) *((str) + 2) << 8) \ + | ((uint32) *((str) + 1) << 16) \ + | ((uint32) *((str) + 0) << 24); \ +} + +#define UNPACK64(x, str) \ +{ \ + *((str) + 7) = (uint8) ((x) ); \ + *((str) + 6) = (uint8) ((x) >> 8); \ + *((str) + 5) = (uint8) ((x) >> 16); \ + *((str) + 4) = (uint8) ((x) >> 24); \ + *((str) + 3) = (uint8) ((x) >> 32); \ + *((str) + 2) = (uint8) ((x) >> 40); \ + *((str) + 1) = (uint8) ((x) >> 48); \ + *((str) + 0) = (uint8) ((x) >> 56); \ +} + +#define PACK64(str, x) \ +{ \ + *(x) = ((uint64) *((str) + 7) ) \ + | ((uint64) *((str) + 6) << 8) \ + | ((uint64) *((str) + 5) << 16) \ + | ((uint64) *((str) + 4) << 24) \ + | ((uint64) *((str) + 3) << 32) \ + | ((uint64) *((str) + 2) << 40) \ + | ((uint64) *((str) + 1) << 48) \ + | ((uint64) *((str) + 0) << 56); \ +} + +#define SHA256_SCR(i) \ +{ \ + w[i] = SHA256_F4(w[i - 2]) + w[i - 7] \ + + SHA256_F3(w[i - 15]) + w[i - 16]; \ +} + +uint32 sha256_h0[8] = + {0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, + 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19}; + +uint32 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}; + +/* SHA-256 functions */ + +static void sha256_transf(sha256_ctx *ctx, const unsigned char *message, + unsigned int block_nb) +{ + uint32 w[64]; + uint32 wv[8]; + uint32 t1, t2; + const unsigned char *sub_block; + int i; + int 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]); + } + + for (j = 16; j < 64; j++) { + SHA256_SCR(j); + } + + for (j = 0; j < 8; j++) { + wv[j] = ctx->h[j]; + } + + 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; + } + + for (j = 0; j < 8; j++) { + ctx->h[j] += wv[j]; + } + } +} + +void sha256(const unsigned char *message, unsigned int len, unsigned char *digest) +{ + sha256_ctx ctx; + + sha256_init(&ctx); + sha256_update(&ctx, message, len); + sha256_final(&ctx, digest); +} + +void sha256_init(sha256_ctx *ctx) +{ + int i; + for (i = 0; i < 8; i++) { + ctx->h[i] = sha256_h0[i]; + } + + ctx->len = 0; + ctx->tot_len = 0; +} + +void sha256_update(sha256_ctx *ctx, const unsigned char *message, + unsigned int len) +{ + unsigned int block_nb; + unsigned int new_len, rem_len, tmp_len; + const unsigned char *shifted_message; + + tmp_len = SHA256_BLOCK_SIZE - ctx->len; + rem_len = len < tmp_len ? len : tmp_len; + + memcpy(&ctx->block[ctx->len], message, 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_message = message + rem_len; + + sha256_transf(ctx, ctx->block, 1); + sha256_transf(ctx, shifted_message, block_nb); + + rem_len = new_len % SHA256_BLOCK_SIZE; + + memcpy(ctx->block, &shifted_message[block_nb << 6], + rem_len); + + ctx->len = rem_len; + ctx->tot_len += (block_nb + 1) << 6; +} + +void sha256_final(sha256_ctx *ctx, unsigned char *digest) +{ + 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_transf(ctx, ctx->block, block_nb); + + for (i = 0 ; i < 8; i++) { + UNPACK32(ctx->h[i], &digest[i << 2]); + } +} + +/* HMAC-SHA-256 functions */ + +void hmac_sha256_init(hmac_sha256_ctx *ctx, const unsigned char *key, + unsigned int key_size) +{ + unsigned int fill; + unsigned int num; + + const unsigned char *key_used; + unsigned char key_temp[SHA256_DIGEST_SIZE]; + int i; + + if (key_size == SHA256_BLOCK_SIZE) { + key_used = key; + num = SHA256_BLOCK_SIZE; + } else { + if (key_size > SHA256_BLOCK_SIZE){ + num = SHA256_DIGEST_SIZE; + sha256(key, key_size, key_temp); + key_used = key_temp; + } else { /* key_size > SHA256_BLOCK_SIZE */ + key_used = key; + num = key_size; + } + fill = SHA256_BLOCK_SIZE - num; + + memset(ctx->block_ipad + num, 0x36, fill); + memset(ctx->block_opad + num, 0x5c, fill); + } + + for (i = 0; i < (int) num; i++) { + ctx->block_ipad[i] = key_used[i] ^ 0x36; + ctx->block_opad[i] = key_used[i] ^ 0x5c; + } + + sha256_init(&ctx->ctx_inside); + sha256_update(&ctx->ctx_inside, ctx->block_ipad, SHA256_BLOCK_SIZE); + + sha256_init(&ctx->ctx_outside); + sha256_update(&ctx->ctx_outside, ctx->block_opad, + SHA256_BLOCK_SIZE); + + /* for hmac_reinit */ + memcpy(&ctx->ctx_inside_reinit, &ctx->ctx_inside, + sizeof(sha256_ctx)); + memcpy(&ctx->ctx_outside_reinit, &ctx->ctx_outside, + sizeof(sha256_ctx)); +} + +void hmac_sha256_reinit(hmac_sha256_ctx *ctx) +{ + memcpy(&ctx->ctx_inside, &ctx->ctx_inside_reinit, + sizeof(sha256_ctx)); + memcpy(&ctx->ctx_outside, &ctx->ctx_outside_reinit, + sizeof(sha256_ctx)); +} + +void hmac_sha256_update(hmac_sha256_ctx *ctx, const unsigned char *message, + unsigned int message_len) +{ + sha256_update(&ctx->ctx_inside, message, message_len); +} + +void hmac_sha256_final(hmac_sha256_ctx *ctx, unsigned char *mac, + unsigned int mac_size) +{ + unsigned char digest_inside[SHA256_DIGEST_SIZE]; + unsigned char mac_temp[SHA256_DIGEST_SIZE]; + + sha256_final(&ctx->ctx_inside, digest_inside); + sha256_update(&ctx->ctx_outside, digest_inside, SHA256_DIGEST_SIZE); + sha256_final(&ctx->ctx_outside, mac_temp); + memcpy(mac, mac_temp, mac_size); +} + +void hmac_sha256(const unsigned char *key, unsigned int key_size, + const unsigned char *message, unsigned int message_len, + unsigned char *mac, unsigned mac_size) +{ + hmac_sha256_ctx ctx; + + hmac_sha256_init(&ctx, key, key_size); + hmac_sha256_update(&ctx, message, message_len); + hmac_sha256_final(&ctx, mac, mac_size); +} diff --git a/tools/vhost-user-rpmb/meson.build b/tools/vhost-user-rpmb/meson.build index cf80bedd99ac..f964837d151d 100644 --- a/tools/vhost-user-rpmb/meson.build +++ b/tools/vhost-user-rpmb/meson.build @@ -1,5 +1,6 @@ executable('vhost-user-rpmb', files( - 'main.c'), + 'main.c', + 'hmac_sha256.c'), dependencies: [qemuutil, glib, gio], link_with: [libvhost_user], install: true,