add sha1-hash calc.

1 files changed, 233 insertions, 0 deletions

diff --git a/libs/ardour/sha1.c b/libs/ardour/sha1.c
new file mode 100644
index 0000000000..5398ad58ae
--- /dev/null
+++ b/libs/ardour/sha1.c
@@ -0,0 +1,233 @@
+/*
+ * Copyright (C) 2012,2015 Robin Gareus <robin@gareus.org>
+ *
+ * This code is inspired by libcrypt, which was placed
+ * in the public domain by Wei Dai and other contributors.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+// gcc -Wall -DSELFTEST_SHA1 -o /tmp/sha1test libs/ardour/sha1.c && /tmp/sha1test
+
+#ifndef EXPORT_SHA
+#define EXPORT_SHA static
+#endif
+
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+#include <stdlib.h>
+
+
+#ifdef __BIG_ENDIAN__
+# define SHA_BIG_ENDIAN
+#elif defined _BIG_ENDIAN
+# define SHA_BIG_ENDIAN
+#elif defined __BYTE_ORDER__
+# if __BYTE_ORDER__ ==  __ORDER_BIG_ENDIAN__
+#  define SHA_BIG_ENDIAN
+# endif
+#elif !defined __LITTLE_ENDIAN__
+# include <endian.h> // machine/endian.h
+# if __BYTE_ORDER__ ==  __ORDER_BIG_ENDIAN__
+#  define SHA_BIG_ENDIAN
+# endif
+#endif
+
+
+#define HASH_LENGTH 20
+#define BLOCK_LENGTH 64
+
+typedef struct {
+	uint32_t buffer[BLOCK_LENGTH/4];
+	uint32_t state[HASH_LENGTH/4];
+	uint32_t byteCount;
+	uint8_t bufferOffset;
+	uint8_t keyBuffer[BLOCK_LENGTH];
+	uint8_t innerHash[HASH_LENGTH];
+} Sha1Digest;
+
+
+static inline uint32_t sha1_rol32 (uint32_t number, uint8_t bits) {
+	return ((number << bits) | (number >> (32 - bits)));
+}
+
+static void sha1_hashBlock (Sha1Digest *s) {
+	uint8_t i;
+	uint32_t a, b, c, d, e, t;
+
+	a = s->state[0];
+	b = s->state[1];
+	c = s->state[2];
+	d = s->state[3];
+	e = s->state[4];
+
+	for (i = 0; i < 80; ++i) {
+		if (i >= 16) {
+			t = s->buffer[(i + 13) & 15] ^ s->buffer[(i + 8) & 15] ^ s->buffer[(i + 2) & 15] ^ s->buffer[i & 15];
+			s->buffer[i & 15] = sha1_rol32 (t, 1);
+		}
+		if (i < 20) {
+			t = (d ^ (b & (c ^ d))) + 0x5a827999;
+		} else if (i < 40) {
+			t = (b ^ c ^ d) + 0x6ed9eba1;
+		} else if (i < 60) {
+			t = ((b & c) | (d & (b | c))) + 0x8f1bbcdc;
+		} else {
+			t = (b ^ c ^ d) + 0xca62c1d6;
+		}
+		t += sha1_rol32 (a, 5) + e + s->buffer[i & 15];
+		e = d;
+		d = c;
+		c = sha1_rol32 (b, 30);
+		b = a;
+		a = t;
+	}
+
+	s->state[0] += a;
+	s->state[1] += b;
+	s->state[2] += c;
+	s->state[3] += d;
+	s->state[4] += e;
+}
+
+static void sha1_addUncounted (Sha1Digest *s, const uint8_t data) {
+	uint8_t * const b = (uint8_t*) s->buffer;
+#ifdef SHA_BIG_ENDIAN
+	b[s->bufferOffset] = data;
+#else
+	b[s->bufferOffset ^ 3] = data;
+#endif
+	s->bufferOffset++;
+	if (s->bufferOffset == BLOCK_LENGTH) {
+		sha1_hashBlock (s);
+		s->bufferOffset = 0;
+	}
+}
+
+static void sha1_pad (Sha1Digest *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);
+}
+
+
+/*** public functions ***/
+
+EXPORT_SHA void sha1_init (Sha1Digest *s) {
+	s->state[0] = 0x67452301;
+	s->state[1] = 0xefcdab89;
+	s->state[2] = 0x98badcfe;
+	s->state[3] = 0x10325476;
+	s->state[4] = 0xc3d2e1f0;
+	s->byteCount = 0;
+	s->bufferOffset = 0;
+}
+
+EXPORT_SHA void sha1_writebyte (Sha1Digest *s, const uint8_t data) {
+	++s->byteCount;
+	sha1_addUncounted (s, data);
+}
+
+EXPORT_SHA void sha1_write (Sha1Digest *s, const uint8_t *data, size_t len) {
+	for (;len--;) sha1_writebyte (s, (uint8_t) *data++);
+}
+
+EXPORT_SHA uint8_t* sha1_result (Sha1Digest *s) {
+	// Pad to complete the last block
+	sha1_pad (s);
+
+#ifndef SHA_BIG_ENDIAN
+	// Swap byte order back
+	int i;
+	for (i = 0; i < 5; ++i) {
+		s->state[i] =
+			  (((s->state[i])<<24)& 0xff000000)
+			| (((s->state[i])<<8) & 0x00ff0000)
+			| (((s->state[i])>>8) & 0x0000ff00)
+			| (((s->state[i])>>24)& 0x000000ff);
+	}
+#endif
+	// Return pointer to hash (20 characters)
+	return (uint8_t*) s->state;
+}
+
+EXPORT_SHA void sha1_result_hash (Sha1Digest *s, char *rv) {
+	int i;
+	uint8_t* hash = sha1_result (s);
+	for (i = 0; i < 20; ++i) {
+		sprintf (&rv[2*i], "%02x", hash[i]);
+	}
+}
+
+
+/*** self-test ***/
+#ifdef SELFTEST_SHA1
+void printHash (Sha1Digest *s) {
+	char hash[41];
+	sha1_result_hash (s, hash);
+	printf ("%s\n", hash);
+}
+
+int main (int argc, char **argv) {
+	uint32_t a;
+	Sha1Digest s;
+
+	// SHA tests
+	printf ("Test: FIPS 180-2 C.1 and RFC3174 7.3 TEST1\n");
+	printf ("Expect:a9993e364706816aba3e25717850c26c9cd0d89d\n");
+	printf ("Result:");
+	sha1_init (&s);
+	sha1_write (&s, "abc", 3);
+	printHash (&s);
+	printf ("\n\n");
+
+	printf ("Test: FIPS 180-2 C.2 and RFC3174 7.3 TEST2\n");
+	printf ("Expect:84983e441c3bd26ebaae4aa1f95129e5e54670f1\n");
+	printf ("Result:");
+	sha1_init (&s);
+	sha1_write (&s, "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq", 56);
+	printHash (&s);
+	printf ("\n\n");
+
+	printf ("Test: RFC3174 7.3 TEST4\n");
+	printf ("Expect:dea356a2cddd90c7a7ecedc5ebb563934f460452\n");
+	printf ("Result:");
+	sha1_init (&s);
+	for (a = 0; a < 80; ++a) sha1_write (&s, "01234567", 8);
+	printHash (&s);
+	printf ("\n\n");
+
+	printf ("Test: FIPS 180-2 C.3 and RFC3174 7.3 TEST3\n");
+	printf ("Expect:34aa973cd4c4daa4f61eeb2bdbad27316534016f\n");
+	printf ("Result:");
+	sha1_init (&s);
+	for (a = 0; a < 1000000; ++a) sha1_writebyte (&s, 'a');
+	printHash (&s);
+
+	return 0;
+}
+#endif /* self-test */