[sw/lib] Remove lib/hmac.c and hw_sha256.c
These modules have not been replaced by lib/dif/dif_hmac.c
Signed-off-by: Miguel Osorio <miguelosorio@google.com>
diff --git a/sw/device/lib/hmac.c b/sw/device/lib/hmac.c
deleted file mode 100644
index 40e867c..0000000
--- a/sw/device/lib/hmac.c
+++ /dev/null
@@ -1,84 +0,0 @@
-// Copyright lowRISC contributors.
-// Licensed under the Apache License, Version 2.0, see LICENSE for details.
-// SPDX-License-Identifier: Apache-2.0
-
-#include "sw/device/lib/hmac.h"
-
-#include "hmac_regs.h" // Generated.
-#include "hw/top_earlgrey/sw/autogen/top_earlgrey.h"
-
-#define HMAC0_BASE_ADDR TOP_EARLGREY_HMAC_BASE_ADDR
-#define HMAC_FIFO_MAX 16
-#define HMAC_FIFO_GROUP_SIZE HMAC_FIFO_MAX / 2
-
-#define REG32(add) *((volatile uint32_t *)(add))
-
-void hmac_init(hmac_cfg_t hmac_cfg) {
- REG32(HMAC0_BASE_ADDR + HMAC_CFG_REG_OFFSET) =
- hmac_cfg.input_endian_swap << HMAC_CFG_ENDIAN_SWAP_BIT |
- 1 << hmac_cfg.mode |
- hmac_cfg.digest_endian_swap << HMAC_CFG_DIGEST_SWAP_BIT;
- for (int i = 0; i < 8; i++) {
- REG32(HMAC0_BASE_ADDR + HMAC_KEY_0_REG_OFFSET + i * sizeof(uint32_t)) =
- hmac_cfg.keys[i];
- }
- REG32(HMAC0_BASE_ADDR + HMAC_CMD_REG_OFFSET) = 1 << HMAC_CMD_HASH_START_BIT;
-};
-
-static int hmac_fifo_depth(void) {
- return (REG32(HMAC0_BASE_ADDR + HMAC_STATUS_REG_OFFSET) >>
- HMAC_STATUS_FIFO_DEPTH_OFFSET) &
- HMAC_STATUS_FIFO_DEPTH_MASK;
-}
-
-static int fifo_avail(void) { return HMAC_FIFO_MAX - hmac_fifo_depth(); }
-
-void hmac_update(const void *data, size_t size_in_bytes) {
- const uint32_t *wp = (const uint32_t *)data;
- uint32_t bytes_per_word = sizeof(uint32_t) / sizeof(uint8_t);
- uint32_t bytes_left_over = (size_in_bytes % bytes_per_word);
- size_t words_remaining = size_in_bytes / bytes_per_word;
-
- // write in all words
- while (words_remaining > 0) {
- if (words_remaining > HMAC_FIFO_GROUP_SIZE) {
- // wait until FIFO is at least half drained
- while (fifo_avail() <= HMAC_FIFO_GROUP_SIZE) {
- }
-
- // write a whole group
- REG32(HMAC0_BASE_ADDR + HMAC_MSG_FIFO_REG_OFFSET) = *wp++;
- REG32(HMAC0_BASE_ADDR + HMAC_MSG_FIFO_REG_OFFSET) = *wp++;
- REG32(HMAC0_BASE_ADDR + HMAC_MSG_FIFO_REG_OFFSET) = *wp++;
- REG32(HMAC0_BASE_ADDR + HMAC_MSG_FIFO_REG_OFFSET) = *wp++;
- REG32(HMAC0_BASE_ADDR + HMAC_MSG_FIFO_REG_OFFSET) = *wp++;
- REG32(HMAC0_BASE_ADDR + HMAC_MSG_FIFO_REG_OFFSET) = *wp++;
- REG32(HMAC0_BASE_ADDR + HMAC_MSG_FIFO_REG_OFFSET) = *wp++;
- REG32(HMAC0_BASE_ADDR + HMAC_MSG_FIFO_REG_OFFSET) = *wp++;
- words_remaining -= HMAC_FIFO_GROUP_SIZE;
- } else {
- REG32(HMAC0_BASE_ADDR + HMAC_MSG_FIFO_REG_OFFSET) = *wp++;
- words_remaining--;
- };
- }
-
- const uint8_t *bp = (const uint8_t *)wp;
- for (; bytes_left_over > 0; --bytes_left_over) {
- *((volatile uint8_t *)HMAC0_BASE_ADDR + HMAC_MSG_FIFO_REG_OFFSET) = *bp++;
- }
-}
-
-void hmac_done(uint32_t *digest) {
- REG32(HMAC0_BASE_ADDR + HMAC_CMD_REG_OFFSET) = 1 << HMAC_CMD_HASH_PROCESS_BIT;
- while (!((REG32(HMAC0_BASE_ADDR + HMAC_INTR_STATE_REG_OFFSET) >>
- HMAC_INTR_STATE_HMAC_DONE_BIT) &
- 0x1)) {
- }
- REG32(HMAC0_BASE_ADDR + HMAC_INTR_STATE_REG_OFFSET) =
- 1 << HMAC_INTR_STATE_HMAC_DONE_BIT;
-
- for (uint32_t i = 0; i < 8; i++) {
- *digest++ = REG32(HMAC0_BASE_ADDR + HMAC_DIGEST_0_REG_OFFSET +
- i * sizeof(uintptr_t));
- }
-}
diff --git a/sw/device/lib/hw_sha256.c b/sw/device/lib/hw_sha256.c
deleted file mode 100644
index 20933fe..0000000
--- a/sw/device/lib/hw_sha256.c
+++ /dev/null
@@ -1,43 +0,0 @@
-// Copyright lowRISC contributors.
-// Licensed under the Apache License, Version 2.0, see LICENSE for details.
-// SPDX-License-Identifier: Apache-2.0
-
-#include "sw/device/lib/hw_sha256.h"
-
-#include "sw/device/lib/hmac.h"
-
-static const HASH_VTAB HW_SHA256_VTAB = {.init = &hw_SHA256_init,
- .update = &hw_SHA256_update,
- .final = &hw_SHA256_final,
- .hash = &hw_SHA256_hash,
- .size = SHA256_DIGEST_SIZE};
-
-static void sha256_init(void) {
- hmac_cfg_t config = {.mode = HMAC_OP_SHA256,
- .input_endian_swap = 1,
- .digest_endian_swap = 1,
- .keys = {0}};
- hmac_init(config);
-}
-
-void hw_SHA256_init(HW_SHA256_CTX *ctx) {
- // TODO: For security, need to make sure HMAC is not stuck in progress.
- ctx->f = &HW_SHA256_VTAB;
- sha256_init();
-}
-
-void hw_SHA256_update(HW_SHA256_CTX *ctx, const void *data, size_t len) {
- hmac_update(data, len);
-}
-
-const uint8_t *hw_SHA256_final(HW_SHA256_CTX *ctx) {
- hmac_done((uint32_t *)ctx->buf);
- return ctx->buf;
-}
-
-const uint8_t *hw_SHA256_hash(const void *data, size_t len, uint8_t *digest) {
- sha256_init();
- hmac_update(data, len);
- hmac_done((uint32_t *)digest);
- return digest;
-}
