diff options
Diffstat (limited to 'chip/npcx/sha256_chip.c')
| -rw-r--r-- | chip/npcx/sha256_chip.c | 141 |
1 files changed, 0 insertions, 141 deletions
diff --git a/chip/npcx/sha256_chip.c b/chip/npcx/sha256_chip.c deleted file mode 100644 index 6d2d938895..0000000000 --- a/chip/npcx/sha256_chip.c +++ /dev/null @@ -1,141 +0,0 @@ -/* - * Copyright 2020 The Chromium OS Authors. All rights reserved. - * Use of this source code is governed by a BSD-style license that can be - * found in the LICENSE file. - */ - -/* SHA256 module for Chrome EC */ -#include "common.h" -#include "sha256.h" -#include "util.h" - -enum ncl_status { - NCL_STATUS_OK, - NCL_STATUS_FAIL, - NCL_STATUS_INVALID_PARAM, - NCL_STATUS_PARAM_NOT_SUPPORTED, - NCL_STATUS_SYSTEM_BUSY, - NCL_STATUS_AUTHENTICATION_FAIL, - NCL_STATUS_NO_RESPONSE, - NCL_STATUS_HARDWARE_ERROR, -}; - -enum ncl_sha_type { - NCL_SHA_TYPE_2_256 = 0, - NCL_SHA_TYPE_2_384 = 1, - NCL_SHA_TYPE_2_512 = 2, - NCL_SHA_TYPE_NUM -}; - -/* - * The base address of the table that holds the function pointer for each - * SHA256 API in ROM. - */ -#define NCL_SHA_BASE_ADDR 0x00000100UL -struct ncl_sha { - /* Get the SHA context size required by SHA APIs. */ - uint32_t (*get_context_size)(void); - /* Initial SHA context. */ - enum ncl_status (*init_context)(void *ctx); - /* Finalize SHA context. */ - enum ncl_status (*finalize_context)(void *ctx); - /* Initiate the SHA hardware module and setups needed parameters. */ - enum ncl_status (*init)(void *ctx); - /* - * Prepare the context buffer for a SHA calculation - by loading the - * initial SHA-256/384/512 parameters. - */ - enum ncl_status (*start)(void *ctx, enum ncl_sha_type type); - /* - * Updates the SHA calculation with the additional data. When the - * function returns, the hardware and memory buffer shall be ready to - * accept new data * buffers for SHA calculation and changes to the data - * in data buffer should no longer effect the SHA calculation. - */ - enum ncl_status (*update)(void *ctx, const uint8_t *data, uint32_t Len); - /* Return the SHA result (digest.) */ - enum ncl_status (*finish)(void *ctx, uint8_t *hashDigest); - /* Perform a complete SHA calculation */ - enum ncl_status (*calc)(void *ctx, enum ncl_sha_type type, - const uint8_t *data, uint32_t Len, uint8_t *hashDigest); - /* Power on/off the SHA module. */ - enum ncl_status (*power)(void *ctx, uint8_t enable); - /* Reset the SHA hardware and terminate any in-progress operations. */ - enum ncl_status (*reset)(void *ctx); -}; - -#define NCL_SHA ((const struct ncl_sha *)NCL_SHA_BASE_ADDR) - -void SHA256_init(struct sha256_ctx *ctx) -{ - NCL_SHA->init_context(ctx->handle); - NCL_SHA->power(ctx->handle, 1); - NCL_SHA->init(ctx->handle); - NCL_SHA->reset(ctx->handle); - NCL_SHA->start(ctx->handle, NCL_SHA_TYPE_2_256); -} - -void SHA256_update(struct sha256_ctx *ctx, const uint8_t *data, uint32_t len) -{ - NCL_SHA->update(ctx->handle, data, len); -} - -void SHA256_abort(struct sha256_ctx *ctx) -{ - NCL_SHA->reset(ctx->handle); - NCL_SHA->power(ctx->handle, 0); - NCL_SHA->finalize_context(ctx->handle); -} - -uint8_t *SHA256_final(struct sha256_ctx *ctx) -{ - NCL_SHA->finish(ctx->handle, ctx->buf); - NCL_SHA->power(ctx->handle, 0); - NCL_SHA->finalize_context(ctx->handle); - 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 hmac_ctx; - uint8_t *key_pad = hmac_ctx.buf; - uint8_t *tmp; - int i; - - memset(key_pad, mask, SHA256_BLOCK_SIZE); - for (i = 0; i < key_len; i++) - key_pad[i] ^= key[i]; - - SHA256_init(&hmac_ctx); - SHA256_update(&hmac_ctx, key_pad, SHA256_BLOCK_SIZE); - SHA256_update(&hmac_ctx, data, data_len); - tmp = SHA256_final(&hmac_ctx); - memcpy(output, tmp, SHA256_DIGEST_SIZE); -} -/* - * Note: When the API is called, it will consume about half of TASK_STACK_SIZE - * because a variable of structure sha256_ctx is declared in the function - * hmac_SHA256_step. - */ -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); -} |