Remove the embedded sha1 code, and use one of botan or gcrypt

This adds a hard dependency on one of Botan or gcrypt. Botan is already a
recommended dependency, and gcrypt is probably packaged almost everywhere,
so this should not be a big deal.

ref #3241

2 files changed, 34 insertions, 151 deletions

diff --git a/louloulibs/utils/sha1.cpp b/louloulibs/utils/sha1.cpp
index f75bc2a..71ad18d 100644
--- a/louloulibs/utils/sha1.cpp
+++ b/louloulibs/utils/sha1.cpp
@@ -1,121 +1,32 @@
-/* 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;
+#include <utils/sha1.hpp>
+
+#include <louloulibs.h>
+
+#ifdef BOTAN_FOUND
+# include <botan/hash.h>
+# include <botan/hex.h>
+#endif
+#ifdef GCRYPT_FOUND
+# include <gcrypt.h>
+# include <vector>
+# include <iomanip>
+# include <sstream>
+#endif
+
+std::string sha1(const std::string& input)
+{
+#ifdef BOTAN_FOUND
+  auto sha1 = Botan::HashFunction::create_or_throw("SHA-1");
+  sha1->update(input);
+  return Botan::hex_encode(sha1->final(), false);
+#endif
+#ifdef GCRYPT_FOUND
+  const auto hash_length = gcry_md_get_algo_dlen(GCRY_MD_SHA1);
+  std::vector<uint8_t> output(hash_length, {});
+  gcry_md_hash_buffer(GCRY_MD_SHA1, output.data(), input.data(), input.size());
+  std::ostringstream digest;
+  for (std::size_t i = 0; i < hash_length; i++)
+    digest << std::hex << std::setfill('0') << std::setw(2) << static_cast<int>(output[i]);
+  return digest.str();
+#endif
 }
diff --git a/louloulibs/utils/sha1.hpp b/louloulibs/utils/sha1.hpp
index d436782..6c551ac 100644
--- a/louloulibs/utils/sha1.hpp
+++ b/louloulibs/utils/sha1.hpp
@@ -1,33 +1,5 @@
-/* This code is public-domain - it is based on libcrypt
- * placed in the public domain by Wei Dai and other contributors.
- */
+#pragma once
 
-#include <stdint.h>
-#include <string.h>
+#include <string>
 
-#define HASH_LENGTH 20
-#define BLOCK_LENGTH 64
-
-union _buffer {
-	uint8_t b[BLOCK_LENGTH];
-	uint32_t w[BLOCK_LENGTH/4];
-};
-
-union _state {
-	uint8_t b[HASH_LENGTH];
-	uint32_t w[HASH_LENGTH/4];
-};
-
-typedef struct sha1nfo {
-	union _buffer buffer;
-	uint8_t bufferOffset;
-	union _state state;
-	uint32_t byteCount;
-	uint8_t keyBuffer[BLOCK_LENGTH];
-	uint8_t innerHash[HASH_LENGTH];
-} sha1nfo;
-
-void sha1_init(sha1nfo *s);
-void sha1_writebyte(sha1nfo *s, uint8_t data);
-void sha1_write(sha1nfo *s, const char *data, size_t len);
-uint8_t* sha1_result(sha1nfo *s);
+std::string sha1(const std::string& input);