Patch from Devin Bayer to split up hash_fd.c into md5.c and sha1.c. (I tweaked

md5_sha1_sum.c to convert some #ifdef CONFIG to if(ENABLE).)

1 files changed, 510 insertions, 0 deletions

diff --git a/libbb/md5.c b/libbb/md5.c
new file mode 100644
index 0000000..8cec885
--- /dev/null
+++ b/libbb/md5.c
@@ -0,0 +1,510 @@
+/*
+ *  md5.c - Compute MD5 checksum of strings according to the
+ *          definition of MD5 in RFC 1321 from April 1992.
+ * 
+ *  Written by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995.
+ *  
+ *  Copyright (C) 1995-1999 Free Software Foundation, Inc.
+ *  Copyright (C) 2001 Manuel Novoa III
+ *  Copyright (C) 2003 Glenn L. McGrath
+ *  Copyright (C) 2003 Erik Andersen
+ *
+ *  Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
+ */
+#include <fcntl.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "busybox.h"
+
+# if CONFIG_MD5_SIZE_VS_SPEED < 0 || CONFIG_MD5_SIZE_VS_SPEED > 3
+# define MD5_SIZE_VS_SPEED 2
+# else
+# define MD5_SIZE_VS_SPEED CONFIG_MD5_SIZE_VS_SPEED
+# endif
+
+/* Handle endian-ness */
+# if !BB_BIG_ENDIAN
+#  define SWAP(n) (n)
+# elif defined(bswap_32)
+#  define SWAP(n) bswap_32(n)
+# else
+#  define SWAP(n) ((n << 24) | ((n&65280)<<8) | ((n&16711680)>>8) | (n>>24))
+# endif
+
+# if MD5_SIZE_VS_SPEED == 0
+/* This array contains the bytes used to pad the buffer to the next
+   64-byte boundary.  (RFC 1321, 3.1: Step 1)  */
+static const unsigned char fillbuf[64] = { 0x80, 0 /* , 0, 0, ...  */  };
+# endif	/* MD5_SIZE_VS_SPEED == 0 */
+
+/* Initialize structure containing state of computation.
+ * (RFC 1321, 3.3: Step 3)
+ */
+void md5_begin(md5_ctx_t *ctx)
+{
+	ctx->A = 0x67452301;
+	ctx->B = 0xefcdab89;
+	ctx->C = 0x98badcfe;
+	ctx->D = 0x10325476;
+
+	ctx->total[0] = ctx->total[1] = 0;
+	ctx->buflen = 0;
+}
+
+/* These are the four functions used in the four steps of the MD5 algorithm
+ * and defined in the RFC 1321.  The first function is a little bit optimized
+ * (as found in Colin Plumbs public domain implementation).
+ * #define FF(b, c, d) ((b & c) | (~b & d))
+ */
+# define FF(b, c, d) (d ^ (b & (c ^ d)))
+# define FG(b, c, d) FF (d, b, c)
+# define FH(b, c, d) (b ^ c ^ d)
+# define FI(b, c, d) (c ^ (b | ~d))
+
+/* Starting with the result of former calls of this function (or the
+ * initialization function update the context for the next LEN bytes
+ * starting at BUFFER.
+ * It is necessary that LEN is a multiple of 64!!!
+ */
+void md5_hash_block(const void *buffer, size_t len, md5_ctx_t *ctx)
+{
+	uint32_t correct_words[16];
+	const uint32_t *words = buffer;
+	size_t nwords = len / sizeof(uint32_t);
+	const uint32_t *endp = words + nwords;
+
+# if MD5_SIZE_VS_SPEED > 0
+	static const uint32_t C_array[] = {
+		/* round 1 */
+		0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee,
+		0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501,
+		0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be,
+		0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821,
+		/* round 2 */
+		0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa,
+		0xd62f105d, 0x2441453, 0xd8a1e681, 0xe7d3fbc8,
+		0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed,
+		0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a,
+		/* round 3 */
+		0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c,
+		0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70,
+		0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x4881d05,
+		0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665,
+		/* round 4 */
+		0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039,
+		0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1,
+		0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1,
+		0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391
+	};
+
+	static const char P_array[] = {
+#  if MD5_SIZE_VS_SPEED > 1
+		0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,	/* 1 */
+#  endif	/* MD5_SIZE_VS_SPEED > 1 */
+		1, 6, 11, 0, 5, 10, 15, 4, 9, 14, 3, 8, 13, 2, 7, 12,	/* 2 */
+		5, 8, 11, 14, 1, 4, 7, 10, 13, 0, 3, 6, 9, 12, 15, 2,	/* 3 */
+		0, 7, 14, 5, 12, 3, 10, 1, 8, 15, 6, 13, 4, 11, 2, 9	/* 4 */
+	};
+
+#  if MD5_SIZE_VS_SPEED > 1
+	static const char S_array[] = {
+		7, 12, 17, 22,
+		5, 9, 14, 20,
+		4, 11, 16, 23,
+		6, 10, 15, 21
+	};
+#  endif	/* MD5_SIZE_VS_SPEED > 1 */
+# endif
+
+	uint32_t A = ctx->A;
+	uint32_t B = ctx->B;
+	uint32_t C = ctx->C;
+	uint32_t D = ctx->D;
+
+	/* First increment the byte count.  RFC 1321 specifies the possible
+	   length of the file up to 2^64 bits.  Here we only compute the
+	   number of bytes.  Do a double word increment.  */
+	ctx->total[0] += len;
+	if (ctx->total[0] < len)
+		++ctx->total[1];
+
+	/* Process all bytes in the buffer with 64 bytes in each round of
+	   the loop.  */
+	while (words < endp) {
+		uint32_t *cwp = correct_words;
+		uint32_t A_save = A;
+		uint32_t B_save = B;
+		uint32_t C_save = C;
+		uint32_t D_save = D;
+
+# if MD5_SIZE_VS_SPEED > 1
+#  define CYCLIC(w, s) (w = (w << s) | (w >> (32 - s)))
+
+		const uint32_t *pc;
+		const char *pp;
+		const char *ps;
+		int i;
+		uint32_t temp;
+
+		for (i = 0; i < 16; i++) {
+			cwp[i] = SWAP(words[i]);
+		}
+		words += 16;
+
+#  if MD5_SIZE_VS_SPEED > 2
+		pc = C_array;
+		pp = P_array;
+		ps = S_array - 4;
+
+		for (i = 0; i < 64; i++) {
+			if ((i & 0x0f) == 0)
+				ps += 4;
+			temp = A;
+			switch (i >> 4) {
+			case 0:
+				temp += FF(B, C, D);
+				break;
+			case 1:
+				temp += FG(B, C, D);
+				break;
+			case 2:
+				temp += FH(B, C, D);
+				break;
+			case 3:
+				temp += FI(B, C, D);
+			}
+			temp += cwp[(int) (*pp++)] + *pc++;
+			CYCLIC(temp, ps[i & 3]);
+			temp += B;
+			A = D;
+			D = C;
+			C = B;
+			B = temp;
+		}
+#  else
+		pc = C_array;
+		pp = P_array;
+		ps = S_array;
+
+		for (i = 0; i < 16; i++) {
+			temp = A + FF(B, C, D) + cwp[(int) (*pp++)] + *pc++;
+			CYCLIC(temp, ps[i & 3]);
+			temp += B;
+			A = D;
+			D = C;
+			C = B;
+			B = temp;
+		}
+
+		ps += 4;
+		for (i = 0; i < 16; i++) {
+			temp = A + FG(B, C, D) + cwp[(int) (*pp++)] + *pc++;
+			CYCLIC(temp, ps[i & 3]);
+			temp += B;
+			A = D;
+			D = C;
+			C = B;
+			B = temp;
+		}
+		ps += 4;
+		for (i = 0; i < 16; i++) {
+			temp = A + FH(B, C, D) + cwp[(int) (*pp++)] + *pc++;
+			CYCLIC(temp, ps[i & 3]);
+			temp += B;
+			A = D;
+			D = C;
+			C = B;
+			B = temp;
+		}
+		ps += 4;
+		for (i = 0; i < 16; i++) {
+			temp = A + FI(B, C, D) + cwp[(int) (*pp++)] + *pc++;
+			CYCLIC(temp, ps[i & 3]);
+			temp += B;
+			A = D;
+			D = C;
+			C = B;
+			B = temp;
+		}
+
+#  endif	/* MD5_SIZE_VS_SPEED > 2 */
+# else
+		/* First round: using the given function, the context and a constant
+		   the next context is computed.  Because the algorithms processing
+		   unit is a 32-bit word and it is determined to work on words in
+		   little endian byte order we perhaps have to change the byte order
+		   before the computation.  To reduce the work for the next steps
+		   we store the swapped words in the array CORRECT_WORDS.  */
+
+#  define OP(a, b, c, d, s, T)	\
+      do	\
+	{	\
+	  a += FF (b, c, d) + (*cwp++ = SWAP (*words)) + T;	\
+	  ++words;	\
+	  CYCLIC (a, s);	\
+	  a += b;	\
+	}	\
+      while (0)
+
+		/* It is unfortunate that C does not provide an operator for
+		   cyclic rotation.  Hope the C compiler is smart enough.  */
+		/* gcc 2.95.4 seems to be --aaronl */
+#  define CYCLIC(w, s) (w = (w << s) | (w >> (32 - s)))
+
+		/* Before we start, one word to the strange constants.
+		   They are defined in RFC 1321 as
+
+		   T[i] = (int) (4294967296.0 * fabs (sin (i))), i=1..64
+		 */
+
+#  if MD5_SIZE_VS_SPEED == 1
+		const uint32_t *pc;
+		const char *pp;
+		int i;
+#  endif	/* MD5_SIZE_VS_SPEED */
+
+		/* Round 1.  */
+#  if MD5_SIZE_VS_SPEED == 1
+		pc = C_array;
+		for (i = 0; i < 4; i++) {
+			OP(A, B, C, D, 7, *pc++);
+			OP(D, A, B, C, 12, *pc++);
+			OP(C, D, A, B, 17, *pc++);
+			OP(B, C, D, A, 22, *pc++);
+		}
+#  else
+		OP(A, B, C, D, 7, 0xd76aa478);
+		OP(D, A, B, C, 12, 0xe8c7b756);
+		OP(C, D, A, B, 17, 0x242070db);
+		OP(B, C, D, A, 22, 0xc1bdceee);
+		OP(A, B, C, D, 7, 0xf57c0faf);
+		OP(D, A, B, C, 12, 0x4787c62a);
+		OP(C, D, A, B, 17, 0xa8304613);
+		OP(B, C, D, A, 22, 0xfd469501);
+		OP(A, B, C, D, 7, 0x698098d8);
+		OP(D, A, B, C, 12, 0x8b44f7af);
+		OP(C, D, A, B, 17, 0xffff5bb1);
+		OP(B, C, D, A, 22, 0x895cd7be);
+		OP(A, B, C, D, 7, 0x6b901122);
+		OP(D, A, B, C, 12, 0xfd987193);
+		OP(C, D, A, B, 17, 0xa679438e);
+		OP(B, C, D, A, 22, 0x49b40821);
+#  endif	/* MD5_SIZE_VS_SPEED == 1 */
+
+		/* For the second to fourth round we have the possibly swapped words
+		   in CORRECT_WORDS.  Redefine the macro to take an additional first
+		   argument specifying the function to use.  */
+#  undef OP
+#  define OP(f, a, b, c, d, k, s, T)	\
+      do	\
+	{	\
+	  a += f (b, c, d) + correct_words[k] + T;	\
+	  CYCLIC (a, s);	\
+	  a += b;	\
+	}	\
+      while (0)
+
+		/* Round 2.  */
+#  if MD5_SIZE_VS_SPEED == 1
+		pp = P_array;
+		for (i = 0; i < 4; i++) {
+			OP(FG, A, B, C, D, (int) (*pp++), 5, *pc++);
+			OP(FG, D, A, B, C, (int) (*pp++), 9, *pc++);
+			OP(FG, C, D, A, B, (int) (*pp++), 14, *pc++);
+			OP(FG, B, C, D, A, (int) (*pp++), 20, *pc++);
+		}
+#  else
+		OP(FG, A, B, C, D, 1, 5, 0xf61e2562);
+		OP(FG, D, A, B, C, 6, 9, 0xc040b340);
+		OP(FG, C, D, A, B, 11, 14, 0x265e5a51);
+		OP(FG, B, C, D, A, 0, 20, 0xe9b6c7aa);
+		OP(FG, A, B, C, D, 5, 5, 0xd62f105d);
+		OP(FG, D, A, B, C, 10, 9, 0x02441453);
+		OP(FG, C, D, A, B, 15, 14, 0xd8a1e681);
+		OP(FG, B, C, D, A, 4, 20, 0xe7d3fbc8);
+		OP(FG, A, B, C, D, 9, 5, 0x21e1cde6);
+		OP(FG, D, A, B, C, 14, 9, 0xc33707d6);
+		OP(FG, C, D, A, B, 3, 14, 0xf4d50d87);
+		OP(FG, B, C, D, A, 8, 20, 0x455a14ed);
+		OP(FG, A, B, C, D, 13, 5, 0xa9e3e905);
+		OP(FG, D, A, B, C, 2, 9, 0xfcefa3f8);
+		OP(FG, C, D, A, B, 7, 14, 0x676f02d9);
+		OP(FG, B, C, D, A, 12, 20, 0x8d2a4c8a);
+#  endif	/* MD5_SIZE_VS_SPEED == 1 */
+
+		/* Round 3.  */
+#  if MD5_SIZE_VS_SPEED == 1
+		for (i = 0; i < 4; i++) {
+			OP(FH, A, B, C, D, (int) (*pp++), 4, *pc++);
+			OP(FH, D, A, B, C, (int) (*pp++), 11, *pc++);
+			OP(FH, C, D, A, B, (int) (*pp++), 16, *pc++);
+			OP(FH, B, C, D, A, (int) (*pp++), 23, *pc++);
+		}
+#  else
+		OP(FH, A, B, C, D, 5, 4, 0xfffa3942);
+		OP(FH, D, A, B, C, 8, 11, 0x8771f681);
+		OP(FH, C, D, A, B, 11, 16, 0x6d9d6122);
+		OP(FH, B, C, D, A, 14, 23, 0xfde5380c);
+		OP(FH, A, B, C, D, 1, 4, 0xa4beea44);
+		OP(FH, D, A, B, C, 4, 11, 0x4bdecfa9);
+		OP(FH, C, D, A, B, 7, 16, 0xf6bb4b60);
+		OP(FH, B, C, D, A, 10, 23, 0xbebfbc70);
+		OP(FH, A, B, C, D, 13, 4, 0x289b7ec6);
+		OP(FH, D, A, B, C, 0, 11, 0xeaa127fa);
+		OP(FH, C, D, A, B, 3, 16, 0xd4ef3085);
+		OP(FH, B, C, D, A, 6, 23, 0x04881d05);
+		OP(FH, A, B, C, D, 9, 4, 0xd9d4d039);
+		OP(FH, D, A, B, C, 12, 11, 0xe6db99e5);
+		OP(FH, C, D, A, B, 15, 16, 0x1fa27cf8);
+		OP(FH, B, C, D, A, 2, 23, 0xc4ac5665);
+#  endif	/* MD5_SIZE_VS_SPEED == 1 */
+
+		/* Round 4.  */
+#  if MD5_SIZE_VS_SPEED == 1
+		for (i = 0; i < 4; i++) {
+			OP(FI, A, B, C, D, (int) (*pp++), 6, *pc++);
+			OP(FI, D, A, B, C, (int) (*pp++), 10, *pc++);
+			OP(FI, C, D, A, B, (int) (*pp++), 15, *pc++);
+			OP(FI, B, C, D, A, (int) (*pp++), 21, *pc++);
+		}
+#  else
+		OP(FI, A, B, C, D, 0, 6, 0xf4292244);
+		OP(FI, D, A, B, C, 7, 10, 0x432aff97);
+		OP(FI, C, D, A, B, 14, 15, 0xab9423a7);
+		OP(FI, B, C, D, A, 5, 21, 0xfc93a039);
+		OP(FI, A, B, C, D, 12, 6, 0x655b59c3);
+		OP(FI, D, A, B, C, 3, 10, 0x8f0ccc92);
+		OP(FI, C, D, A, B, 10, 15, 0xffeff47d);
+		OP(FI, B, C, D, A, 1, 21, 0x85845dd1);
+		OP(FI, A, B, C, D, 8, 6, 0x6fa87e4f);
+		OP(FI, D, A, B, C, 15, 10, 0xfe2ce6e0);
+		OP(FI, C, D, A, B, 6, 15, 0xa3014314);
+		OP(FI, B, C, D, A, 13, 21, 0x4e0811a1);
+		OP(FI, A, B, C, D, 4, 6, 0xf7537e82);
+		OP(FI, D, A, B, C, 11, 10, 0xbd3af235);
+		OP(FI, C, D, A, B, 2, 15, 0x2ad7d2bb);
+		OP(FI, B, C, D, A, 9, 21, 0xeb86d391);
+#  endif	/* MD5_SIZE_VS_SPEED == 1 */
+# endif	/* MD5_SIZE_VS_SPEED > 1 */
+
+		/* Add the starting values of the context.  */
+		A += A_save;
+		B += B_save;
+		C += C_save;
+		D += D_save;
+	}
+
+	/* Put checksum in context given as argument.  */
+	ctx->A = A;
+	ctx->B = B;
+	ctx->C = C;
+	ctx->D = D;
+}
+
+/* Starting with the result of former calls of this function (or the
+ * initialization function update the context for the next LEN bytes
+ * starting at BUFFER.
+ * It is NOT required that LEN is a multiple of 64.
+ */
+
+static void md5_hash_bytes(const void *buffer, size_t len, md5_ctx_t *ctx)
+{
+	/* When we already have some bits in our internal buffer concatenate
+	   both inputs first.  */
+	if (ctx->buflen != 0) {
+		size_t left_over = ctx->buflen;
+		size_t add = 128 - left_over > len ? len : 128 - left_over;
+
+		memcpy(&ctx->buffer[left_over], buffer, add);
+		ctx->buflen += add;
+
+		if (left_over + add > 64) {
+			md5_hash_block(ctx->buffer, (left_over + add) & ~63, ctx);
+			/* The regions in the following copy operation cannot overlap.  */
+			memcpy(ctx->buffer, &ctx->buffer[(left_over + add) & ~63],
+				   (left_over + add) & 63);
+			ctx->buflen = (left_over + add) & 63;
+		}
+
+		buffer = (const char *) buffer + add;
+		len -= add;
+	}
+
+	/* Process available complete blocks.  */
+	if (len > 64) {
+		md5_hash_block(buffer, len & ~63, ctx);
+		buffer = (const char *) buffer + (len & ~63);
+		len &= 63;
+	}
+
+	/* Move remaining bytes in internal buffer.  */
+	if (len > 0) {
+		memcpy(ctx->buffer, buffer, len);
+		ctx->buflen = len;
+	}
+}
+
+void md5_hash(const void *data, size_t length, md5_ctx_t *ctx)
+{
+	if (length % 64 == 0) {
+		md5_hash_block(data, length, ctx);
+	} else {
+		md5_hash_bytes(data, length, ctx);
+	}
+}
+
+/* Process the remaining bytes in the buffer and put result from CTX
+ * in first 16 bytes following RESBUF.  The result is always in little
+ * endian byte order, so that a byte-wise output yields to the wanted
+ * ASCII representation of the message digest.
+ *
+ * IMPORTANT: On some systems it is required that RESBUF is correctly
+ * aligned for a 32 bits value.
+ */
+void *md5_end(void *resbuf, md5_ctx_t *ctx)
+{
+	/* Take yet unprocessed bytes into account.  */
+	uint32_t bytes = ctx->buflen;
+	size_t pad;
+
+	/* Now count remaining bytes.  */
+	ctx->total[0] += bytes;
+	if (ctx->total[0] < bytes)
+		++ctx->total[1];
+
+	pad = bytes >= 56 ? 64 + 56 - bytes : 56 - bytes;
+# if MD5_SIZE_VS_SPEED > 0
+	memset(&ctx->buffer[bytes], 0, pad);
+	ctx->buffer[bytes] = 0x80;
+# else
+	memcpy(&ctx->buffer[bytes], fillbuf, pad);
+# endif	/* MD5_SIZE_VS_SPEED > 0 */
+
+	/* Put the 64-bit file length in *bits* at the end of the buffer.  */
+	*(uint32_t *) & ctx->buffer[bytes + pad] = SWAP(ctx->total[0] << 3);
+	*(uint32_t *) & ctx->buffer[bytes + pad + 4] =
+		SWAP(((ctx->total[1] << 3) | (ctx->total[0] >> 29)));
+
+	/* Process last bytes.  */
+	md5_hash_block(ctx->buffer, bytes + pad + 8, ctx);
+
+	/* Put result from CTX in first 16 bytes following RESBUF.  The result is
+	 * always in little endian byte order, so that a byte-wise output yields
+	 * to the wanted ASCII representation of the message digest.
+	 *
+	 * IMPORTANT: On some systems it is required that RESBUF is correctly
+	 * aligned for a 32 bits value.
+	 */
+	((uint32_t *) resbuf)[0] = SWAP(ctx->A);
+	((uint32_t *) resbuf)[1] = SWAP(ctx->B);
+	((uint32_t *) resbuf)[2] = SWAP(ctx->C);
+	((uint32_t *) resbuf)[3] = SWAP(ctx->D);
+
+	return resbuf;
+}
+