From 4a0ff5577363a1bd315693b41f448e3774de9e34 Mon Sep 17 00:00:00 2001
From: Wesley Ellis <tahnok@gmail.com>
Date: Tue, 23 Nov 2021 21:37:54 -0500
Subject: Properly vendor TOTP-MCU temporarily

---
 movement/lib/TOTP-MCU        |   1 -
 movement/lib/TOTP-MCU/sha1.c | 155 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 155 insertions(+), 1 deletion(-)
 delete mode 160000 movement/lib/TOTP-MCU
 create mode 100644 movement/lib/TOTP-MCU/sha1.c

(limited to 'movement/lib/TOTP-MCU/sha1.c')

diff --git a/movement/lib/TOTP-MCU b/movement/lib/TOTP-MCU
deleted file mode 160000
index 646474a8..00000000
--- a/movement/lib/TOTP-MCU
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 646474a8757e1fca490792e81082b2ad89b966a3
diff --git a/movement/lib/TOTP-MCU/sha1.c b/movement/lib/TOTP-MCU/sha1.c
new file mode 100644
index 00000000..07ad697b
--- /dev/null
+++ b/movement/lib/TOTP-MCU/sha1.c
@@ -0,0 +1,155 @@
+#include <string.h>
+#include "sha1.h"
+
+#define SHA1_K0 0x5a827999
+#define SHA1_K20 0x6ed9eba1
+#define SHA1_K40 0x8f1bbcdc
+#define SHA1_K60 0xca62c1d6
+
+uint8_t sha1InitState[] = {
+  0x01,0x23,0x45,0x67, // H0
+  0x89,0xab,0xcd,0xef, // H1
+  0xfe,0xdc,0xba,0x98, // H2
+  0x76,0x54,0x32,0x10, // H3
+  0xf0,0xe1,0xd2,0xc3  // H4
+};
+
+void init(void) {
+  memcpy(state.b,sha1InitState,HASH_LENGTH);
+  byteCount = 0;
+  bufferOffset = 0;
+}
+
+uint32_t rol32(uint32_t number, uint8_t bits) {
+  return ((number << bits) | (uint32_t)(number >> (32-bits)));
+}
+
+void hashBlock() {
+  uint8_t i;
+  uint32_t a,b,c,d,e,t;
+
+  a=state.w[0];
+  b=state.w[1];
+  c=state.w[2];
+  d=state.w[3];
+  e=state.w[4];
+  for (i=0; i<80; i++) {
+    if (i>=16) {
+      t = buffer.w[(i+13)&15] ^ buffer.w[(i+8)&15] ^ buffer.w[(i+2)&15] ^ buffer.w[i&15];
+      buffer.w[i&15] = rol32(t,1);
+    }
+    if (i<20) {
+      t = (d ^ (b & (c ^ d))) + SHA1_K0;
+    } else if (i<40) {
+      t = (b ^ c ^ d) + SHA1_K20;
+    } else if (i<60) {
+      t = ((b & c) | (d & (b | c))) + SHA1_K40;
+    } else {
+      t = (b ^ c ^ d) + SHA1_K60;
+    }
+    t+=rol32(a,5) + e + buffer.w[i&15];
+    e=d;
+    d=c;
+    c=rol32(b,30);
+    b=a;
+    a=t;
+  }
+  state.w[0] += a;
+  state.w[1] += b;
+  state.w[2] += c;
+  state.w[3] += d;
+  state.w[4] += e;
+}
+
+void addUncounted(uint8_t data) {
+  buffer.b[bufferOffset ^ 3] = data;
+  bufferOffset++;
+  if (bufferOffset == BLOCK_LENGTH) {
+    hashBlock();
+    bufferOffset = 0;
+  }
+}
+
+void write(uint8_t data) {
+  ++byteCount;
+  addUncounted(data);
+
+  return;
+}
+
+void writeArray(uint8_t *buffer, uint8_t size){
+    while (size--) {
+        write(*buffer++);
+    }
+}
+
+void pad() {
+  // Implement SHA-1 padding (fips180-2 �˜5.1.1)
+
+  // Pad with 0x80 followed by 0x00 until the end of the block
+  addUncounted(0x80);
+  while (bufferOffset != 56) addUncounted(0x00);
+
+  // Append length in the last 8 bytes
+  addUncounted(0); // We're only using 32 bit lengths
+  addUncounted(0); // But SHA-1 supports 64 bit lengths
+  addUncounted(0); // So zero pad the top bits
+  addUncounted(byteCount >> 29); // Shifting to multiply by 8
+  addUncounted(byteCount >> 21); // as SHA-1 supports bitstreams as well as
+  addUncounted(byteCount >> 13); // byte.
+  addUncounted(byteCount >> 5);
+  addUncounted(byteCount << 3);
+}
+
+uint8_t* result(void) {
+  // Pad to complete the last block
+  pad();
+
+  // Swap byte order back
+  uint8_t i;
+  for (i=0; i<5; i++) {
+    uint32_t a,b;
+    a=state.w[i];
+    b=a<<24;
+    b|=(a<<8) & 0x00ff0000;
+    b|=(a>>8) & 0x0000ff00;
+    b|=a>>24;
+    state.w[i]=b;
+  }
+
+  // Return pointer to hash (20 characters)
+  return state.b;
+}
+
+#define HMAC_IPAD 0x36
+#define HMAC_OPAD 0x5c
+
+void initHmac(const uint8_t* key, uint8_t keyLength) {
+  uint8_t i;
+  memset(keyBuffer,0,BLOCK_LENGTH);
+  if (keyLength > BLOCK_LENGTH) {
+    // Hash long keys
+    init();
+    for (;keyLength--;) write(*key++);
+    memcpy(keyBuffer,result(),HASH_LENGTH);
+  } else {
+    // Block length keys are used as is
+    memcpy(keyBuffer,key,keyLength);
+  }
+  // Start inner hash
+  init();
+  for (i=0; i<BLOCK_LENGTH; i++) {
+    write(keyBuffer[i] ^ HMAC_IPAD);
+  }
+}
+
+uint8_t* resultHmac(void) {
+  uint8_t i;
+  // Complete inner hash
+  memcpy(innerHash,result(),HASH_LENGTH);
+  // Calculate outer hash
+  init();
+  for (i=0; i<BLOCK_LENGTH; i++) write(keyBuffer[i] ^ HMAC_OPAD);
+  for (i=0; i<HASH_LENGTH; i++) write(innerHash[i]);
+  return result();
+}
-- 
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