1 files changed, 154 insertions, 0 deletions

diff --git a/src/utils/sha1.cpp b/src/utils/sha1.cpp
new file mode 100644
index 0000000..76476df
--- /dev/null
+++ b/src/utils/sha1.cpp
@@ -0,0 +1,154 @@
+/* This code is public-domain - it is based on libcrypt
+ * placed in the public domain by Wei Dai and other contributors.
+ */
+
+#include "sha1.hpp"
+
+#define SHA1_K0 0x5a827999
+#define SHA1_K20 0x6ed9eba1
+#define SHA1_K40 0x8f1bbcdc
+#define SHA1_K60 0xca62c1d6
+
+const 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 sha1_init(sha1nfo *s) {
+  memcpy(s->state.b,sha1InitState,HASH_LENGTH);
+  s->byteCount = 0;
+  s->bufferOffset = 0;
+}
+
+uint32_t sha1_rol32(uint32_t number, uint8_t bits) {
+  return ((number << bits) | (number >> (32-bits)));
+}
+
+void sha1_hashBlock(sha1nfo *s) {
+  uint8_t i;
+  uint32_t a,b,c,d,e,t;
+
+  a=s->state.w[0];
+  b=s->state.w[1];
+  c=s->state.w[2];
+  d=s->state.w[3];
+  e=s->state.w[4];
+  for (i=0; i<80; i++) {
+    if (i>=16) {
+      t = s->buffer.w[(i+13)&15] ^ s->buffer.w[(i+8)&15] ^ s->buffer.w[(i+2)&15] ^ s->buffer.w[i&15];
+      s->buffer.w[i&15] = sha1_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+=sha1_rol32(a,5) + e + s->buffer.w[i&15];
+    e=d;
+    d=c;
+    c=sha1_rol32(b,30);
+    b=a;
+    a=t;
+  }
+  s->state.w[0] += a;
+  s->state.w[1] += b;
+  s->state.w[2] += c;
+  s->state.w[3] += d;
+  s->state.w[4] += e;
+}
+
+void sha1_addUncounted(sha1nfo *s, uint8_t data) {
+  s->buffer.b[s->bufferOffset ^ 3] = data;
+  s->bufferOffset++;
+  if (s->bufferOffset == BLOCK_LENGTH) {
+    sha1_hashBlock(s);
+    s->bufferOffset = 0;
+  }
+}
+
+void sha1_writebyte(sha1nfo *s, uint8_t data) {
+  ++s->byteCount;
+  sha1_addUncounted(s, data);
+}
+
+void sha1_write(sha1nfo *s, const char *data, size_t len) {
+	for (;len--;) sha1_writebyte(s, (uint8_t) *data++);
+}
+
+void sha1_pad(sha1nfo *s) {
+  // Implement SHA-1 padding (fips180-2 §5.1.1)
+
+  // Pad with 0x80 followed by 0x00 until the end of the block
+  sha1_addUncounted(s, 0x80);
+  while (s->bufferOffset != 56) sha1_addUncounted(s, 0x00);
+
+  // Append length in the last 8 bytes
+  sha1_addUncounted(s, 0); // We're only using 32 bit lengths
+  sha1_addUncounted(s, 0); // But SHA-1 supports 64 bit lengths
+  sha1_addUncounted(s, 0); // So zero pad the top bits
+  sha1_addUncounted(s, s->byteCount >> 29); // Shifting to multiply by 8
+  sha1_addUncounted(s, s->byteCount >> 21); // as SHA-1 supports bitstreams as well as
+  sha1_addUncounted(s, s->byteCount >> 13); // byte.
+  sha1_addUncounted(s, s->byteCount >> 5);
+  sha1_addUncounted(s, s->byteCount << 3);
+}
+
+uint8_t* sha1_result(sha1nfo *s) {
+  int i;
+  // Pad to complete the last block
+  sha1_pad(s);
+
+  // Swap byte order back
+  for (i=0; i<5; i++) {
+    uint32_t a,b;
+    a=s->state.w[i];
+    b=a<<24;
+    b|=(a<<8) & 0x00ff0000;
+    b|=(a>>8) & 0x0000ff00;
+    b|=a>>24;
+    s->state.w[i]=b;
+  }
+
+  // Return pointer to hash (20 characters)
+  return s->state.b;
+}
+
+#define HMAC_IPAD 0x36
+#define HMAC_OPAD 0x5c
+
+void sha1_initHmac(sha1nfo *s, const uint8_t* key, int keyLength) {
+  uint8_t i;
+  memset(s->keyBuffer, 0, BLOCK_LENGTH);
+  if (keyLength > BLOCK_LENGTH) {
+    // Hash long keys
+    sha1_init(s);
+    for (;keyLength--;) sha1_writebyte(s, *key++);
+    memcpy(s->keyBuffer, sha1_result(s), HASH_LENGTH);
+  } else {
+    // Block length keys are used as is
+    memcpy(s->keyBuffer, key, keyLength);
+  }
+  // Start inner hash
+  sha1_init(s);
+  for (i=0; i<BLOCK_LENGTH; i++) {
+    sha1_writebyte(s, s->keyBuffer[i] ^ HMAC_IPAD);
+  }
+}
+
+uint8_t* sha1_resultHmac(sha1nfo *s) {
+  uint8_t i;
+  // Complete inner hash
+  memcpy(s->innerHash,sha1_result(s),HASH_LENGTH);
+  // Calculate outer hash
+  sha1_init(s);
+  for (i=0; i<BLOCK_LENGTH; i++) sha1_writebyte(s, s->keyBuffer[i] ^ HMAC_OPAD);
+  for (i=0; i<HASH_LENGTH; i++) sha1_writebyte(s, s->innerHash[i]);
+  return sha1_result(s);
+}