8f907b25ba
and add the Enterprise / Commercial licensing option.
Main changes:
- Replace GPLv3 headers with AGPLv3 headers in source files.
- Update LICENSE file to the full AGPLv3 text.
- Add ENTERPRISE.md describing the dual-licensing model:
* Community Edition: AGPLv3 (strong copyleft, including network use).
* Enterprise / Commercial Edition: proprietary license for production /
multi-user / OEM use without the obligation to disclose derivative code.
- Update README with a new "License and Commercial Use" section pointing to
ENTERPRISE.md and clarifying how companies can obtain a commercial license.
Why this change:
- AGPLv3 ensures that modified versions offered as a service or deployed
in production environments must provide corresponding source code.
- The Enterprise / Commercial edition provides organizations with an
alternative proprietary license that allows internal, large-scale, or OEM
use (bulk provisioning, policy enforcement, inventory / revocation,
custom attestation, signed builds) without AGPL disclosure obligations.
This commit formally marks the first release that is dual-licensed:
AGPLv3 for the Community Edition and a proprietary commercial license
for Enterprise customers.
Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>
288 lines
9.9 KiB
C
288 lines
9.9 KiB
C
/*
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* This file is part of the Pico Keys SDK distribution (https://github.com/polhenarejos/pico-keys-sdk).
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* Copyright (c) 2022 Pol Henarejos.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, version 3.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "common.h"
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#include "mbedtls/sha256.h"
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#include "mbedtls/platform_util.h"
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#include "mbedtls/error.h"
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#include "pico/sha256.h"
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#define SHA256_BLOCK_SIZE 64
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static const uint32_t K[] = {
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0x428A2F98, 0x71374491, 0xB5C0FBCF, 0xE9B5DBA5,
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0x3956C25B, 0x59F111F1, 0x923F82A4, 0xAB1C5ED5,
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0xD807AA98, 0x12835B01, 0x243185BE, 0x550C7DC3,
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0x72BE5D74, 0x80DEB1FE, 0x9BDC06A7, 0xC19BF174,
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0xE49B69C1, 0xEFBE4786, 0x0FC19DC6, 0x240CA1CC,
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0x2DE92C6F, 0x4A7484AA, 0x5CB0A9DC, 0x76F988DA,
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0x983E5152, 0xA831C66D, 0xB00327C8, 0xBF597FC7,
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0xC6E00BF3, 0xD5A79147, 0x06CA6351, 0x14292967,
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0x27B70A85, 0x2E1B2138, 0x4D2C6DFC, 0x53380D13,
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0x650A7354, 0x766A0ABB, 0x81C2C92E, 0x92722C85,
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0xA2BFE8A1, 0xA81A664B, 0xC24B8B70, 0xC76C51A3,
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0xD192E819, 0xD6990624, 0xF40E3585, 0x106AA070,
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0x19A4C116, 0x1E376C08, 0x2748774C, 0x34B0BCB5,
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0x391C0CB3, 0x4ED8AA4A, 0x5B9CCA4F, 0x682E6FF3,
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0x748F82EE, 0x78A5636F, 0x84C87814, 0x8CC70208,
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0x90BEFFFA, 0xA4506CEB, 0xBEF9A3F7, 0xC67178F2,
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};
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#define SHR(x, n) (((x) & 0xFFFFFFFF) >> (n))
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#define ROTR(x, n) (SHR(x, n) | ((x) << (32 - (n))))
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#define S0(x) (ROTR(x, 7) ^ ROTR(x, 18) ^ SHR(x, 3))
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#define S1(x) (ROTR(x, 17) ^ ROTR(x, 19) ^ SHR(x, 10))
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#define S2(x) (ROTR(x, 2) ^ ROTR(x, 13) ^ ROTR(x, 22))
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#define S3(x) (ROTR(x, 6) ^ ROTR(x, 11) ^ ROTR(x, 25))
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#define F0(x, y, z) (((x) & (y)) | ((z) & ((x) | (y))))
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#define F1(x, y, z) ((z) ^ ((x) & ((y) ^ (z))))
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#define R(t) \
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( \
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local.W[t] = S1(local.W[(t) - 2]) + local.W[(t) - 7] + \
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S0(local.W[(t) - 15]) + local.W[(t) - 16] \
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)
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#define P(a, b, c, d, e, f, g, h, x, K) \
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do \
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{ \
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local.temp1 = (h) + S3(e) + F1((e), (f), (g)) + (K) + (x); \
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local.temp2 = S2(a) + F0((a), (b), (c)); \
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(d) += local.temp1; (h) = local.temp1 + local.temp2; \
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} while (0)
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void mbedtls_sha256_init(mbedtls_sha256_context *ctx) {
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memset(ctx, 0, sizeof(mbedtls_sha256_context));
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}
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void mbedtls_sha256_free(mbedtls_sha256_context *ctx) {
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if (ctx == NULL) {
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return;
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}
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mbedtls_platform_zeroize(ctx, sizeof(mbedtls_sha256_context));
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}
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int mbedtls_sha256_starts(mbedtls_sha256_context *ctx, int is224) {
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ctx->is224 = is224;
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if (is224 == 1) {
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ctx->total[0] = 0;
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ctx->total[1] = 0;
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ctx->state[0] = 0xC1059ED8;
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ctx->state[1] = 0x367CD507;
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ctx->state[2] = 0x3070DD17;
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ctx->state[3] = 0xF70E5939;
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ctx->state[4] = 0xFFC00B31;
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ctx->state[5] = 0x68581511;
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ctx->state[6] = 0x64F98FA7;
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ctx->state[7] = 0xBEFA4FA4;
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}
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else {
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return pico_sha256_start_blocking(&ctx->pico_state, SHA256_BIG_ENDIAN, true);
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}
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return 0;
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}
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static int mbedtls_internal_sha256_process_c(mbedtls_sha256_context *ctx, const unsigned char data[SHA256_BLOCK_SIZE]) {
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struct {
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uint32_t temp1, temp2, W[64];
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uint32_t A[8];
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} local;
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unsigned int i;
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for (i = 0; i < 8; i++) {
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local.A[i] = ctx->state[i];
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}
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for (i = 0; i < 16; i++) {
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local.W[i] = MBEDTLS_GET_UINT32_BE(data, 4 * i);
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}
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for (i = 0; i < 16; i += 8) {
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P(local.A[0], local.A[1], local.A[2], local.A[3], local.A[4],
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local.A[5], local.A[6], local.A[7], local.W[i+0], K[i+0]);
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P(local.A[7], local.A[0], local.A[1], local.A[2], local.A[3],
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local.A[4], local.A[5], local.A[6], local.W[i+1], K[i+1]);
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P(local.A[6], local.A[7], local.A[0], local.A[1], local.A[2],
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local.A[3], local.A[4], local.A[5], local.W[i+2], K[i+2]);
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P(local.A[5], local.A[6], local.A[7], local.A[0], local.A[1],
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local.A[2], local.A[3], local.A[4], local.W[i+3], K[i+3]);
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P(local.A[4], local.A[5], local.A[6], local.A[7], local.A[0],
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local.A[1], local.A[2], local.A[3], local.W[i+4], K[i+4]);
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P(local.A[3], local.A[4], local.A[5], local.A[6], local.A[7],
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local.A[0], local.A[1], local.A[2], local.W[i+5], K[i+5]);
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P(local.A[2], local.A[3], local.A[4], local.A[5], local.A[6],
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local.A[7], local.A[0], local.A[1], local.W[i+6], K[i+6]);
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P(local.A[1], local.A[2], local.A[3], local.A[4], local.A[5],
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local.A[6], local.A[7], local.A[0], local.W[i+7], K[i+7]);
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}
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for (i = 16; i < 64; i += 8) {
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P(local.A[0], local.A[1], local.A[2], local.A[3], local.A[4],
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local.A[5], local.A[6], local.A[7], R(i+0), K[i+0]);
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P(local.A[7], local.A[0], local.A[1], local.A[2], local.A[3],
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local.A[4], local.A[5], local.A[6], R(i+1), K[i+1]);
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P(local.A[6], local.A[7], local.A[0], local.A[1], local.A[2],
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local.A[3], local.A[4], local.A[5], R(i+2), K[i+2]);
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P(local.A[5], local.A[6], local.A[7], local.A[0], local.A[1],
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local.A[2], local.A[3], local.A[4], R(i+3), K[i+3]);
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P(local.A[4], local.A[5], local.A[6], local.A[7], local.A[0],
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local.A[1], local.A[2], local.A[3], R(i+4), K[i+4]);
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P(local.A[3], local.A[4], local.A[5], local.A[6], local.A[7],
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local.A[0], local.A[1], local.A[2], R(i+5), K[i+5]);
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P(local.A[2], local.A[3], local.A[4], local.A[5], local.A[6],
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local.A[7], local.A[0], local.A[1], R(i+6), K[i+6]);
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P(local.A[1], local.A[2], local.A[3], local.A[4], local.A[5],
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local.A[6], local.A[7], local.A[0], R(i+7), K[i+7]);
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}
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for (i = 0; i < 8; i++) {
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ctx->state[i] += local.A[i];
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}
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/* Zeroise buffers and variables to clear sensitive data from memory. */
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mbedtls_platform_zeroize(&local, sizeof(local));
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return 0;
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}
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static size_t mbedtls_internal_sha256_process_many_c(mbedtls_sha256_context *ctx, const uint8_t *data, size_t len) {
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size_t processed = 0;
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while (len >= SHA256_BLOCK_SIZE) {
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if (mbedtls_internal_sha256_process_c(ctx, data) != 0) {
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return 0;
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}
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data += SHA256_BLOCK_SIZE;
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len -= SHA256_BLOCK_SIZE;
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processed += SHA256_BLOCK_SIZE;
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}
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return processed;
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}
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int mbedtls_sha256_update(mbedtls_sha256_context *ctx, const unsigned char *input, size_t ilen) {
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if (ctx->is224 == 1) {
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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size_t fill;
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uint32_t left;
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if (ilen == 0) {
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return 0;
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}
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left = ctx->total[0] & 0x3F;
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fill = SHA256_BLOCK_SIZE - left;
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ctx->total[0] += (uint32_t) ilen;
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ctx->total[0] &= 0xFFFFFFFF;
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if (ctx->total[0] < (uint32_t) ilen) {
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ctx->total[1]++;
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}
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if (left && ilen >= fill) {
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memcpy((void *) (ctx->buffer + left), input, fill);
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if ((ret = mbedtls_internal_sha256_process_c(ctx, ctx->buffer)) != 0) {
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return ret;
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}
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input += fill;
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ilen -= fill;
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left = 0;
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}
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while (ilen >= SHA256_BLOCK_SIZE) {
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size_t processed = mbedtls_internal_sha256_process_many_c(ctx, input, ilen);
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if (processed < SHA256_BLOCK_SIZE) {
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return MBEDTLS_ERR_ERROR_GENERIC_ERROR;
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}
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input += processed;
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ilen -= processed;
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}
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if (ilen > 0) {
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memcpy((void *) (ctx->buffer + left), input, ilen);
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}
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}
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else {
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pico_sha256_update_blocking(&ctx->pico_state, (const uint8_t *)input, ilen);
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}
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return 0;
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}
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int mbedtls_sha256_finish(mbedtls_sha256_context *ctx, unsigned char *output) {
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if (ctx->is224) {
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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uint32_t used;
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uint32_t high, low;
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used = ctx->total[0] & 0x3F;
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ctx->buffer[used++] = 0x80;
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if (used <= 56) {
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memset(ctx->buffer + used, 0, 56 - used);
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} else {
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memset(ctx->buffer + used, 0, SHA256_BLOCK_SIZE - used);
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if ((ret = mbedtls_internal_sha256_process_c(ctx, ctx->buffer)) != 0) {
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goto exit;
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}
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memset(ctx->buffer, 0, 56);
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}
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high = (ctx->total[0] >> 29) | (ctx->total[1] << 3);
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low = (ctx->total[0] << 3);
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MBEDTLS_PUT_UINT32_BE(high, ctx->buffer, 56);
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MBEDTLS_PUT_UINT32_BE(low, ctx->buffer, 60);
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if ((ret = mbedtls_internal_sha256_process_c(ctx, ctx->buffer)) != 0) {
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goto exit;
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}
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MBEDTLS_PUT_UINT32_BE(ctx->state[0], output, 0);
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MBEDTLS_PUT_UINT32_BE(ctx->state[1], output, 4);
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MBEDTLS_PUT_UINT32_BE(ctx->state[2], output, 8);
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MBEDTLS_PUT_UINT32_BE(ctx->state[3], output, 12);
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MBEDTLS_PUT_UINT32_BE(ctx->state[4], output, 16);
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MBEDTLS_PUT_UINT32_BE(ctx->state[5], output, 20);
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MBEDTLS_PUT_UINT32_BE(ctx->state[6], output, 24);
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ret = 0;
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exit:
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mbedtls_sha256_free(ctx);
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return ret;
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}
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else {
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sha256_result_t result;
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pico_sha256_finish(&ctx->pico_state, &result);
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memcpy(output, result.bytes, 32);
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}
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return 0;
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}
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