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-rw-r--r--butl/buildfile1
-rw-r--r--butl/sha25676
-rw-r--r--butl/sha256.cxx76
-rw-r--r--butl/sha256c.c393
4 files changed, 546 insertions, 0 deletions
diff --git a/butl/buildfile b/butl/buildfile
index f075e30..a92f4a9 100644
--- a/butl/buildfile
+++ b/butl/buildfile
@@ -13,6 +13,7 @@ lib{butl}: \
{hxx }{ path-io } \
{hxx }{ path-map } \
{hxx txx }{ prefix-map } \
+{hxx cxx}{ sha256 } \
{hxx ixx cxx}{ process } \
{hxx txx }{ string-table } \
{hxx cxx}{ timestamp } \
diff --git a/butl/sha256 b/butl/sha256
new file mode 100644
index 0000000..3fc9e63
--- /dev/null
+++ b/butl/sha256
@@ -0,0 +1,76 @@
+// file : butl/sha256 -*- C++ -*-
+// copyright : Copyright (c) 2014-2016 Code Synthesis Ltd
+// license : MIT; see accompanying LICENSE file
+
+#ifndef BUTL_SHA256
+#define BUTL_SHA256
+
+#include <string>
+#include <cstring> // strlen()
+#include <cstdint>
+#include <cstddef> // size_t
+
+namespace butl
+{
+ // SHA256 checksum calculator.
+ //
+ // For a single chunk of data a sum can be obtained in one line, for
+ // example:
+ //
+ // cerr << sha256 ("123").string () << endl;
+ //
+ class sha256
+ {
+ public:
+ sha256 ();
+ explicit sha256 (const std::string& s): sha256 () {append (s);}
+ explicit sha256 (const char* s): sha256 () {append (s);}
+ sha256 (const void* b, std::size_t n): sha256 () {append (b, n);}
+
+ // Append string (without the traling '\0').
+ //
+ void
+ append (const std::string& s) {append (s.c_str (), s.size ());}
+
+ // Append C-string (without the traling '\0').
+ //
+ void
+ append (const char* s) {append (s, std::strlen (s));}
+
+ // Append binary data.
+ //
+ void
+ append (const void*, std::size_t);
+
+ // Extract result. It can be obtained as either a 32-byte binary digest or
+ // as a 64- character hex-encoded C-string.
+ //
+ using digest_type = std::uint8_t[32];
+
+ const digest_type&
+ binary () const;
+
+ const char*
+ string () const;
+
+ public:
+ struct context
+ {
+ std::uint32_t state[8];
+ std::uint64_t count;
+ std::uint8_t buf[64];
+ };
+
+ private:
+ union
+ {
+ mutable context ctx_;
+ mutable char str_[65];
+ };
+
+ mutable digest_type bin_;
+ mutable bool done_;
+ };
+};
+
+#endif // BUTL_SHA256
diff --git a/butl/sha256.cxx b/butl/sha256.cxx
new file mode 100644
index 0000000..feca9a7
--- /dev/null
+++ b/butl/sha256.cxx
@@ -0,0 +1,76 @@
+// file : butl/sha256.cxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2016 Code Synthesis Ltd
+// license : MIT; see accompanying LICENSE file
+
+#include <butl/sha256>
+
+// C interface for sha256c.
+//
+#include <stdint.h>
+#include <stddef.h> // size_t
+
+using SHA256_CTX = butl::sha256::context;
+
+extern "C"
+{
+ static void SHA256_Init (SHA256_CTX*);
+ static void SHA256_Update (SHA256_CTX*, const void*, size_t);
+ static void SHA256_Final (uint8_t[32], SHA256_CTX*);
+
+#include "sha256c.c"
+}
+
+using namespace std;
+
+namespace butl
+{
+ sha256::
+ sha256 ()
+ : done_ (false)
+ {
+ SHA256_Init (&ctx_);
+ }
+
+ void sha256::
+ append (const void* b, size_t n)
+ {
+ SHA256_Update (&ctx_, b, n);
+ }
+
+ const sha256::digest_type& sha256::
+ binary () const
+ {
+ if (!done_)
+ {
+ SHA256_Final (bin_, &ctx_);
+ done_ = true;
+ str_[0] = '\0'; // Indicate we haven't computed the string yet.
+ }
+
+ return bin_;
+ }
+
+ static const char hex_map[16] = {
+ '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
+ 'a', 'b', 'c', 'd', 'e', 'f'};
+
+ const char* sha256::
+ string () const
+ {
+ if (!done_)
+ binary ();
+
+ if (str_[0] == '\0')
+ {
+ for (size_t i (0); i != 32; ++i)
+ {
+ str_[i * 2] = hex_map[bin_[i] >> 4];
+ str_[i * 2 + 1] = hex_map[bin_[i] & 0x0f];
+ }
+
+ str_[64] = '\0';
+ }
+
+ return str_;
+ }
+}
diff --git a/butl/sha256c.c b/butl/sha256c.c
new file mode 100644
index 0000000..3a6b8eb
--- /dev/null
+++ b/butl/sha256c.c
@@ -0,0 +1,393 @@
+/*-
+ * Copyright 2005 Colin Percival
+ * Copyright 2016 Code Synthesis Ltd
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <stdint.h>
+#include <stddef.h> /* size_t */
+
+#ifdef SHA256_TEST_DRIVER
+
+struct context
+{
+ uint32_t state[8];
+ uint64_t count;
+ uint8_t buf[64];
+};
+
+typedef struct context SHA256_CTX;
+
+static void SHA256_Init (SHA256_CTX*);
+static void SHA256_Update (SHA256_CTX*, const void*, size_t);
+static void SHA256_Final (uint8_t[32], SHA256_CTX*);
+
+#include <string.h>
+#include <assert.h>
+
+int
+main ()
+{
+ SHA256_CTX c;
+ uint8_t r[32];
+
+ /* "" e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855 */
+ SHA256_Init (&c);
+ SHA256_Final (r, &c);
+ assert (r[0] == 0xe3 && r[31] == 0x55);
+
+ /* "123" a665a45920422f9d417e4867efdc4fb8a04a1f3fff1fa07e998e86f7f7a27ae3 */
+ SHA256_Init (&c);
+ SHA256_Update (&c, "123", 3);
+ SHA256_Final (r, &c);
+ assert (r[0] == 0xa6 && r[31] == 0xe3);
+
+ return 0;
+}
+
+#endif /* SHA256_TEST_DRIVER */
+
+#ifdef __FreeBSD__
+# include <sys/endian.h> /* BYTE_ORDER, be32dec(), be32enc(), be64enc */
+#else
+# if defined(_WIN32)
+# ifndef BYTE_ORDER
+# define BIG_ENDIAN 4321
+# define LITTLE_ENDIAN 1234
+# define BYTE_ORDER LITTLE_ENDIAN
+# endif
+# else
+# include <sys/param.h> /* BYTE_ORDER/__BYTE_ORDER */
+# ifndef BYTE_ORDER
+# ifdef __BYTE_ORDER
+# define BYTE_ORDER __BYTE_ORDER
+# define BIG_ENDIAN __BIG_ENDIAN
+# define LITTLE_ENDIAN __LITTLE_ENDIAN
+# else
+# error no BYTE_ORDER/__BYTE_ORDER define
+# endif
+# endif
+# endif
+
+static uint32_t
+be32dec(const void *pp)
+{
+ unsigned char const *p = (unsigned char const *)pp;
+
+ return ((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]);
+}
+
+static void
+be32enc(void *pp, uint32_t u)
+{
+ unsigned char *p = (unsigned char *)pp;
+
+ p[0] = (u >> 24) & 0xff;
+ p[1] = (u >> 16) & 0xff;
+ p[2] = (u >> 8) & 0xff;
+ p[3] = u & 0xff;
+}
+
+static void
+be64enc(void *pp, uint64_t u)
+{
+ unsigned char *p = (unsigned char *)pp;
+
+ p[0] = (u >> 56) & 0xff;
+ p[1] = (u >> 48) & 0xff;
+ p[2] = (u >> 40) & 0xff;
+ p[3] = (u >> 32) & 0xff;
+ p[4] = (u >> 24) & 0xff;
+ p[5] = (u >> 16) & 0xff;
+ p[6] = (u >> 8) & 0xff;
+ p[7] = u & 0xff;
+}
+#endif
+
+/* The rest is the unmodified (except for a few explicit casts to make it
+ compilable in C++), latest implementation from FreeBSD. */
+
+#include <string.h>
+
+#if BYTE_ORDER == BIG_ENDIAN
+
+/* Copy a vector of big-endian uint32_t into a vector of bytes */
+#define be32enc_vect(dst, src, len) \
+ memcpy((void *)dst, (const void *)src, (size_t)len)
+
+/* Copy a vector of bytes into a vector of big-endian uint32_t */
+#define be32dec_vect(dst, src, len) \
+ memcpy((void *)dst, (const void *)src, (size_t)len)
+
+#else /* BYTE_ORDER != BIG_ENDIAN */
+
+/*
+ * Encode a length len/4 vector of (uint32_t) into a length len vector of
+ * (unsigned char) in big-endian form. Assumes len is a multiple of 4.
+ */
+static void
+be32enc_vect(unsigned char *dst, const uint32_t *src, size_t len)
+{
+ size_t i;
+
+ for (i = 0; i < len / 4; i++)
+ be32enc(dst + i * 4, src[i]);
+}
+
+/*
+ * Decode a big-endian length len vector of (unsigned char) into a length
+ * len/4 vector of (uint32_t). Assumes len is a multiple of 4.
+ */
+static void
+be32dec_vect(uint32_t *dst, const unsigned char *src, size_t len)
+{
+ size_t i;
+
+ for (i = 0; i < len / 4; i++)
+ dst[i] = be32dec(src + i * 4);
+}
+
+#endif /* BYTE_ORDER != BIG_ENDIAN */
+
+/* Elementary functions used by SHA256 */
+#define Ch(x, y, z) ((x & (y ^ z)) ^ z)
+#define Maj(x, y, z) ((x & (y | z)) | (y & z))
+#define SHR(x, n) (x >> n)
+#define ROTR(x, n) ((x >> n) | (x << (32 - n)))
+#define S0(x) (ROTR(x, 2) ^ ROTR(x, 13) ^ ROTR(x, 22))
+#define S1(x) (ROTR(x, 6) ^ ROTR(x, 11) ^ ROTR(x, 25))
+#define s0(x) (ROTR(x, 7) ^ ROTR(x, 18) ^ SHR(x, 3))
+#define s1(x) (ROTR(x, 17) ^ ROTR(x, 19) ^ SHR(x, 10))
+
+/* SHA256 round function */
+#define RND(a, b, c, d, e, f, g, h, k) \
+ t0 = h + S1(e) + Ch(e, f, g) + k; \
+ t1 = S0(a) + Maj(a, b, c); \
+ d += t0; \
+ h = t0 + t1;
+
+/* Adjusted round function for rotating state */
+#define RNDr(S, W, i, k) \
+ RND(S[(64 - i) % 8], S[(65 - i) % 8], \
+ S[(66 - i) % 8], S[(67 - i) % 8], \
+ S[(68 - i) % 8], S[(69 - i) % 8], \
+ S[(70 - i) % 8], S[(71 - i) % 8], \
+ W[i] + k)
+
+/*
+ * SHA256 block compression function. The 256-bit state is transformed via
+ * the 512-bit input block to produce a new state.
+ */
+static void
+SHA256_Transform(uint32_t * state, const unsigned char block[64])
+{
+ uint32_t W[64];
+ uint32_t S[8];
+ uint32_t t0, t1;
+ int i;
+
+ /* 1. Prepare message schedule W. */
+ be32dec_vect(W, block, 64);
+ for (i = 16; i < 64; i++)
+ W[i] = s1(W[i - 2]) + W[i - 7] + s0(W[i - 15]) + W[i - 16];
+
+ /* 2. Initialize working variables. */
+ memcpy(S, state, 32);
+
+ /* 3. Mix. */
+ RNDr(S, W, 0, 0x428a2f98);
+ RNDr(S, W, 1, 0x71374491);
+ RNDr(S, W, 2, 0xb5c0fbcf);
+ RNDr(S, W, 3, 0xe9b5dba5);
+ RNDr(S, W, 4, 0x3956c25b);
+ RNDr(S, W, 5, 0x59f111f1);
+ RNDr(S, W, 6, 0x923f82a4);
+ RNDr(S, W, 7, 0xab1c5ed5);
+ RNDr(S, W, 8, 0xd807aa98);
+ RNDr(S, W, 9, 0x12835b01);
+ RNDr(S, W, 10, 0x243185be);
+ RNDr(S, W, 11, 0x550c7dc3);
+ RNDr(S, W, 12, 0x72be5d74);
+ RNDr(S, W, 13, 0x80deb1fe);
+ RNDr(S, W, 14, 0x9bdc06a7);
+ RNDr(S, W, 15, 0xc19bf174);
+ RNDr(S, W, 16, 0xe49b69c1);
+ RNDr(S, W, 17, 0xefbe4786);
+ RNDr(S, W, 18, 0x0fc19dc6);
+ RNDr(S, W, 19, 0x240ca1cc);
+ RNDr(S, W, 20, 0x2de92c6f);
+ RNDr(S, W, 21, 0x4a7484aa);
+ RNDr(S, W, 22, 0x5cb0a9dc);
+ RNDr(S, W, 23, 0x76f988da);
+ RNDr(S, W, 24, 0x983e5152);
+ RNDr(S, W, 25, 0xa831c66d);
+ RNDr(S, W, 26, 0xb00327c8);
+ RNDr(S, W, 27, 0xbf597fc7);
+ RNDr(S, W, 28, 0xc6e00bf3);
+ RNDr(S, W, 29, 0xd5a79147);
+ RNDr(S, W, 30, 0x06ca6351);
+ RNDr(S, W, 31, 0x14292967);
+ RNDr(S, W, 32, 0x27b70a85);
+ RNDr(S, W, 33, 0x2e1b2138);
+ RNDr(S, W, 34, 0x4d2c6dfc);
+ RNDr(S, W, 35, 0x53380d13);
+ RNDr(S, W, 36, 0x650a7354);
+ RNDr(S, W, 37, 0x766a0abb);
+ RNDr(S, W, 38, 0x81c2c92e);
+ RNDr(S, W, 39, 0x92722c85);
+ RNDr(S, W, 40, 0xa2bfe8a1);
+ RNDr(S, W, 41, 0xa81a664b);
+ RNDr(S, W, 42, 0xc24b8b70);
+ RNDr(S, W, 43, 0xc76c51a3);
+ RNDr(S, W, 44, 0xd192e819);
+ RNDr(S, W, 45, 0xd6990624);
+ RNDr(S, W, 46, 0xf40e3585);
+ RNDr(S, W, 47, 0x106aa070);
+ RNDr(S, W, 48, 0x19a4c116);
+ RNDr(S, W, 49, 0x1e376c08);
+ RNDr(S, W, 50, 0x2748774c);
+ RNDr(S, W, 51, 0x34b0bcb5);
+ RNDr(S, W, 52, 0x391c0cb3);
+ RNDr(S, W, 53, 0x4ed8aa4a);
+ RNDr(S, W, 54, 0x5b9cca4f);
+ RNDr(S, W, 55, 0x682e6ff3);
+ RNDr(S, W, 56, 0x748f82ee);
+ RNDr(S, W, 57, 0x78a5636f);
+ RNDr(S, W, 58, 0x84c87814);
+ RNDr(S, W, 59, 0x8cc70208);
+ RNDr(S, W, 60, 0x90befffa);
+ RNDr(S, W, 61, 0xa4506ceb);
+ RNDr(S, W, 62, 0xbef9a3f7);
+ RNDr(S, W, 63, 0xc67178f2);
+
+ /* 4. Mix local working variables into global state */
+ for (i = 0; i < 8; i++)
+ state[i] += S[i];
+}
+
+static unsigned char PAD[64] = {
+ 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
+};
+
+/* Add padding and terminating bit-count. */
+static void
+SHA256_Pad(SHA256_CTX * ctx)
+{
+ unsigned char len[8];
+ uint32_t r, plen;
+
+ /*
+ * Convert length to a vector of bytes -- we do this now rather
+ * than later because the length will change after we pad.
+ */
+ be64enc(len, ctx->count);
+
+ /* Add 1--64 bytes so that the resulting length is 56 mod 64 */
+ r = (ctx->count >> 3) & 0x3f;
+ plen = (r < 56) ? (56 - r) : (120 - r);
+ SHA256_Update(ctx, PAD, (size_t)plen);
+
+ /* Add the terminating bit-count */
+ SHA256_Update(ctx, len, 8);
+}
+
+/* SHA-256 initialization. Begins a SHA-256 operation. */
+void
+SHA256_Init(SHA256_CTX * ctx)
+{
+
+ /* Zero bits processed so far */
+ ctx->count = 0;
+
+ /* Magic initialization constants */
+ ctx->state[0] = 0x6A09E667;
+ ctx->state[1] = 0xBB67AE85;
+ ctx->state[2] = 0x3C6EF372;
+ ctx->state[3] = 0xA54FF53A;
+ ctx->state[4] = 0x510E527F;
+ ctx->state[5] = 0x9B05688C;
+ ctx->state[6] = 0x1F83D9AB;
+ ctx->state[7] = 0x5BE0CD19;
+}
+
+/* Add bytes into the hash */
+void
+SHA256_Update(SHA256_CTX * ctx, const void *in, size_t len)
+{
+ uint64_t bitlen;
+ uint32_t r;
+ const unsigned char *src = (const unsigned char *) (in);
+
+ /* Number of bytes left in the buffer from previous updates */
+ r = (ctx->count >> 3) & 0x3f;
+
+ /* Convert the length into a number of bits */
+ bitlen = len << 3;
+
+ /* Update number of bits */
+ ctx->count += bitlen;
+
+ /* Handle the case where we don't need to perform any transforms */
+ if (len < 64 - r) {
+ memcpy(&ctx->buf[r], src, len);
+ return;
+ }
+
+ /* Finish the current block */
+ memcpy(&ctx->buf[r], src, 64 - r);
+ SHA256_Transform(ctx->state, ctx->buf);
+ src += 64 - r;
+ len -= 64 - r;
+
+ /* Perform complete blocks */
+ while (len >= 64) {
+ SHA256_Transform(ctx->state, src);
+ src += 64;
+ len -= 64;
+ }
+
+ /* Copy left over data into buffer */
+ memcpy(ctx->buf, src, len);
+}
+
+/*
+ * SHA-256 finalization. Pads the input data, exports the hash value,
+ * and clears the context state.
+ */
+void
+SHA256_Final(uint8_t digest[32], SHA256_CTX * ctx)
+{
+
+ /* Add padding */
+ SHA256_Pad(ctx);
+
+ /* Write the hash */
+ be32enc_vect(digest, ctx->state, 32);
+
+ /* Clear the context state */
+ memset((void *)ctx, 0, sizeof(*ctx));
+}