Refactor MD5 implementations according to new cryptohash infrastructure

This commit heavily reorganizes the MD5 implementations that exist in
the tree in various aspects.

First, MD5 is added to the list of options available in cryptohash.c and
cryptohash_openssl.c.  This means that if building with OpenSSL, EVP is
used for MD5 instead of the fallback implementation that Postgres had
for ages.  With the recent refactoring work for cryptohash functions,
this change is straight-forward.  If not building with OpenSSL, a
fallback implementation internal to src/common/ is used.

Second, this reduces the number of MD5 implementations present in the
tree from two to one, by moving the KAME implementation from pgcrypto to
src/common/, and by removing the implementation that existed in
src/common/.  KAME was already structured with an init/update/final set
of routines by pgcrypto (see original pgcrypto/md5.h) for compatibility
with OpenSSL, so moving it to src/common/ has proved to be a
straight-forward move, requiring no actual manipulation of the internals
of each routine.  Some benchmarking has not shown any performance gap
between both implementations.

Similarly to the fallback implementation used for SHA2, the fallback
implementation of MD5 is moved to src/common/md5.c with an internal
header called md5_int.h for the init, update and final routines.  This
gets then consumed by cryptohash.c.

The original routines used for MD5-hashed passwords are moved to a
separate file called md5_common.c, also in src/common/, aimed at being
shared between all MD5 implementations as utility routines to keep
compatibility with any code relying on them.

Like the SHA2 changes, this commit had its round of tests on both Linux
and Windows, across all versions of OpenSSL supported on HEAD, with and
even without OpenSSL.

Author: Michael Paquier
Reviewed-by: Daniel Gustafsson
Discussion: https://postgr.es/m/20201106073434.GA4961@paquier.xyz

4 files changed, 14 insertions, 489 deletions

diff --git a/contrib/pgcrypto/Makefile b/contrib/pgcrypto/Makefile
index 61eabd2fc0..d881e85add 100644
--- a/contrib/pgcrypto/Makefile
+++ b/contrib/pgcrypto/Makefile
@@ -1,6 +1,6 @@
 # contrib/pgcrypto/Makefile
 
-INT_SRCS = md5.c sha1.c internal.c internal-sha2.c blf.c rijndael.c \
+INT_SRCS = sha1.c internal.c internal-sha2.c blf.c rijndael.c \
 		pgp-mpi-internal.c imath.c
 INT_TESTS = sha2
 
diff --git a/contrib/pgcrypto/internal.c b/contrib/pgcrypto/internal.c
index 06469d41c0..e6d90c5656 100644
--- a/contrib/pgcrypto/internal.c
+++ b/contrib/pgcrypto/internal.c
@@ -34,11 +34,13 @@
 #include <time.h>
 
 #include "blf.h"
-#include "md5.h"
 #include "px.h"
 #include "rijndael.h"
 #include "sha1.h"
 
+#include "common/cryptohash.h"
+#include "common/md5.h"
+
 #ifndef MD5_DIGEST_LENGTH
 #define MD5_DIGEST_LENGTH 16
 #endif
@@ -96,34 +98,33 @@ int_md5_block_len(PX_MD *h)
 static void
 int_md5_update(PX_MD *h, const uint8 *data, unsigned dlen)
 {
-	MD5_CTX    *ctx = (MD5_CTX *) h->p.ptr;
+	pg_cryptohash_ctx *ctx = (pg_cryptohash_ctx *) h->p.ptr;
 
-	MD5Update(ctx, data, dlen);
+	pg_cryptohash_update(ctx, data, dlen);
 }
 
 static void
 int_md5_reset(PX_MD *h)
 {
-	MD5_CTX    *ctx = (MD5_CTX *) h->p.ptr;
+	pg_cryptohash_ctx *ctx = (pg_cryptohash_ctx *) h->p.ptr;
 
-	MD5Init(ctx);
+	pg_cryptohash_init(ctx);
 }
 
 static void
 int_md5_finish(PX_MD *h, uint8 *dst)
 {
-	MD5_CTX    *ctx = (MD5_CTX *) h->p.ptr;
+	pg_cryptohash_ctx *ctx = (pg_cryptohash_ctx *) h->p.ptr;
 
-	MD5Final(dst, ctx);
+	pg_cryptohash_final(ctx, dst);
 }
 
 static void
 int_md5_free(PX_MD *h)
 {
-	MD5_CTX    *ctx = (MD5_CTX *) h->p.ptr;
+	pg_cryptohash_ctx *ctx = (pg_cryptohash_ctx *) h->p.ptr;
 
-	px_memset(ctx, 0, sizeof(*ctx));
-	pfree(ctx);
+	pg_cryptohash_free(ctx);
 	pfree(h);
 }
 
@@ -180,9 +181,9 @@ int_sha1_free(PX_MD *h)
 static void
 init_md5(PX_MD *md)
 {
-	MD5_CTX    *ctx;
+	pg_cryptohash_ctx *ctx;
 
-	ctx = palloc0(sizeof(*ctx));
+	ctx = pg_cryptohash_create(PG_MD5);
 
 	md->p.ptr = ctx;
 
diff --git a/contrib/pgcrypto/md5.c b/contrib/pgcrypto/md5.c
deleted file mode 100644
index 15d7c9bcdc..0000000000
--- a/contrib/pgcrypto/md5.c
+++ /dev/null
@@ -1,397 +0,0 @@
-/*	   $KAME: md5.c,v 1.3 2000/02/22 14:01:17 itojun Exp $	   */
-
-/*
- * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
- * 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.
- * 3. Neither the name of the project nor the names of its contributors
- *	  may be used to endorse or promote products derived from this software
- *	  without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE PROJECT 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 PROJECT 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.
- *
- * contrib/pgcrypto/md5.c
- */
-
-#include "postgres.h"
-
-#include <sys/param.h>
-
-#include "md5.h"
-
-#define SHIFT(X, s) (((X) << (s)) | ((X) >> (32 - (s))))
-
-#define F(X, Y, Z) (((X) & (Y)) | ((~X) & (Z)))
-#define G(X, Y, Z) (((X) & (Z)) | ((Y) & (~Z)))
-#define H(X, Y, Z) ((X) ^ (Y) ^ (Z))
-#define I(X, Y, Z) ((Y) ^ ((X) | (~Z)))
-
-#define ROUND1(a, b, c, d, k, s, i) \
-do { \
-	(a) = (a) + F((b), (c), (d)) + X[(k)] + T[(i)]; \
-	(a) = SHIFT((a), (s)); \
-	(a) = (b) + (a); \
-} while (0)
-
-#define ROUND2(a, b, c, d, k, s, i) \
-do { \
-	(a) = (a) + G((b), (c), (d)) + X[(k)] + T[(i)]; \
-	(a) = SHIFT((a), (s)); \
-	(a) = (b) + (a); \
-} while (0)
-
-#define ROUND3(a, b, c, d, k, s, i) \
-do { \
-	(a) = (a) + H((b), (c), (d)) + X[(k)] + T[(i)]; \
-	(a) = SHIFT((a), (s)); \
-	(a) = (b) + (a); \
-} while (0)
-
-#define ROUND4(a, b, c, d, k, s, i) \
-do { \
-	(a) = (a) + I((b), (c), (d)) + X[(k)] + T[(i)]; \
-	(a) = SHIFT((a), (s)); \
-	(a) = (b) + (a); \
-} while (0)
-
-#define Sa	 7
-#define Sb	12
-#define Sc	17
-#define Sd	22
-
-#define Se	 5
-#define Sf	 9
-#define Sg	14
-#define Sh	20
-
-#define Si	 4
-#define Sj	11
-#define Sk	16
-#define Sl	23
-
-#define Sm	 6
-#define Sn	10
-#define So	15
-#define Sp	21
-
-#define MD5_A0	0x67452301
-#define MD5_B0	0xefcdab89
-#define MD5_C0	0x98badcfe
-#define MD5_D0	0x10325476
-
-/* Integer part of 4294967296 times abs(sin(i)), where i is in radians. */
-static const uint32 T[65] = {
-	0,
-	0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee,
-	0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501,
-	0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be,
-	0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821,
-
-	0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa,
-	0xd62f105d, 0x2441453, 0xd8a1e681, 0xe7d3fbc8,
-	0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed,
-	0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a,
-
-	0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c,
-	0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70,
-	0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x4881d05,
-	0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665,
-
-	0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039,
-	0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1,
-	0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1,
-	0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391,
-};
-
-static const uint8 md5_paddat[MD5_BUFLEN] = {
-	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,
-};
-
-static void md5_calc(const uint8 *, md5_ctxt *);
-
-void
-md5_init(md5_ctxt *ctxt)
-{
-	ctxt->md5_n = 0;
-	ctxt->md5_i = 0;
-	ctxt->md5_sta = MD5_A0;
-	ctxt->md5_stb = MD5_B0;
-	ctxt->md5_stc = MD5_C0;
-	ctxt->md5_std = MD5_D0;
-	memset(ctxt->md5_buf, 0, sizeof(ctxt->md5_buf));
-}
-
-void
-md5_loop(md5_ctxt *ctxt, const uint8 *input, unsigned len)
-{
-	unsigned int gap,
-				i;
-
-	ctxt->md5_n += len * 8;		/* byte to bit */
-	gap = MD5_BUFLEN - ctxt->md5_i;
-
-	if (len >= gap)
-	{
-		memmove(ctxt->md5_buf + ctxt->md5_i, input, gap);
-		md5_calc(ctxt->md5_buf, ctxt);
-
-		for (i = gap; i + MD5_BUFLEN <= len; i += MD5_BUFLEN)
-			md5_calc(input + i, ctxt);
-
-		ctxt->md5_i = len - i;
-		memmove(ctxt->md5_buf, input + i, ctxt->md5_i);
-	}
-	else
-	{
-		memmove(ctxt->md5_buf + ctxt->md5_i, input, len);
-		ctxt->md5_i += len;
-	}
-}
-
-void
-md5_pad(md5_ctxt *ctxt)
-{
-	unsigned int gap;
-
-	/* Don't count up padding. Keep md5_n. */
-	gap = MD5_BUFLEN - ctxt->md5_i;
-	if (gap > 8)
-	{
-		memmove(ctxt->md5_buf + ctxt->md5_i, md5_paddat,
-				gap - sizeof(ctxt->md5_n));
-	}
-	else
-	{
-		/* including gap == 8 */
-		memmove(ctxt->md5_buf + ctxt->md5_i, md5_paddat, gap);
-		md5_calc(ctxt->md5_buf, ctxt);
-		memmove(ctxt->md5_buf, md5_paddat + gap,
-				MD5_BUFLEN - sizeof(ctxt->md5_n));
-	}
-
-	/* 8 byte word */
-#ifndef WORDS_BIGENDIAN
-	memmove(&ctxt->md5_buf[56], &ctxt->md5_n8[0], 8);
-#else
-	ctxt->md5_buf[56] = ctxt->md5_n8[7];
-	ctxt->md5_buf[57] = ctxt->md5_n8[6];
-	ctxt->md5_buf[58] = ctxt->md5_n8[5];
-	ctxt->md5_buf[59] = ctxt->md5_n8[4];
-	ctxt->md5_buf[60] = ctxt->md5_n8[3];
-	ctxt->md5_buf[61] = ctxt->md5_n8[2];
-	ctxt->md5_buf[62] = ctxt->md5_n8[1];
-	ctxt->md5_buf[63] = ctxt->md5_n8[0];
-#endif
-
-	md5_calc(ctxt->md5_buf, ctxt);
-}
-
-void
-md5_result(uint8 *digest, md5_ctxt *ctxt)
-{
-	/* 4 byte words */
-#ifndef WORDS_BIGENDIAN
-	memmove(digest, &ctxt->md5_st8[0], 16);
-#else
-	digest[0] = ctxt->md5_st8[3];
-	digest[1] = ctxt->md5_st8[2];
-	digest[2] = ctxt->md5_st8[1];
-	digest[3] = ctxt->md5_st8[0];
-	digest[4] = ctxt->md5_st8[7];
-	digest[5] = ctxt->md5_st8[6];
-	digest[6] = ctxt->md5_st8[5];
-	digest[7] = ctxt->md5_st8[4];
-	digest[8] = ctxt->md5_st8[11];
-	digest[9] = ctxt->md5_st8[10];
-	digest[10] = ctxt->md5_st8[9];
-	digest[11] = ctxt->md5_st8[8];
-	digest[12] = ctxt->md5_st8[15];
-	digest[13] = ctxt->md5_st8[14];
-	digest[14] = ctxt->md5_st8[13];
-	digest[15] = ctxt->md5_st8[12];
-#endif
-}
-
-#ifdef WORDS_BIGENDIAN
-static uint32 X[16];
-#endif
-
-static void
-md5_calc(const uint8 *b64, md5_ctxt *ctxt)
-{
-	uint32		A = ctxt->md5_sta;
-	uint32		B = ctxt->md5_stb;
-	uint32		C = ctxt->md5_stc;
-	uint32		D = ctxt->md5_std;
-
-#ifndef WORDS_BIGENDIAN
-	const uint32 *X = (const uint32 *) b64;
-#else
-	/* 4 byte words */
-	/* what a brute force but fast! */
-	uint8	   *y = (uint8 *) X;
-
-	y[0] = b64[3];
-	y[1] = b64[2];
-	y[2] = b64[1];
-	y[3] = b64[0];
-	y[4] = b64[7];
-	y[5] = b64[6];
-	y[6] = b64[5];
-	y[7] = b64[4];
-	y[8] = b64[11];
-	y[9] = b64[10];
-	y[10] = b64[9];
-	y[11] = b64[8];
-	y[12] = b64[15];
-	y[13] = b64[14];
-	y[14] = b64[13];
-	y[15] = b64[12];
-	y[16] = b64[19];
-	y[17] = b64[18];
-	y[18] = b64[17];
-	y[19] = b64[16];
-	y[20] = b64[23];
-	y[21] = b64[22];
-	y[22] = b64[21];
-	y[23] = b64[20];
-	y[24] = b64[27];
-	y[25] = b64[26];
-	y[26] = b64[25];
-	y[27] = b64[24];
-	y[28] = b64[31];
-	y[29] = b64[30];
-	y[30] = b64[29];
-	y[31] = b64[28];
-	y[32] = b64[35];
-	y[33] = b64[34];
-	y[34] = b64[33];
-	y[35] = b64[32];
-	y[36] = b64[39];
-	y[37] = b64[38];
-	y[38] = b64[37];
-	y[39] = b64[36];
-	y[40] = b64[43];
-	y[41] = b64[42];
-	y[42] = b64[41];
-	y[43] = b64[40];
-	y[44] = b64[47];
-	y[45] = b64[46];
-	y[46] = b64[45];
-	y[47] = b64[44];
-	y[48] = b64[51];
-	y[49] = b64[50];
-	y[50] = b64[49];
-	y[51] = b64[48];
-	y[52] = b64[55];
-	y[53] = b64[54];
-	y[54] = b64[53];
-	y[55] = b64[52];
-	y[56] = b64[59];
-	y[57] = b64[58];
-	y[58] = b64[57];
-	y[59] = b64[56];
-	y[60] = b64[63];
-	y[61] = b64[62];
-	y[62] = b64[61];
-	y[63] = b64[60];
-#endif
-
-	ROUND1(A, B, C, D, 0, Sa, 1);
-	ROUND1(D, A, B, C, 1, Sb, 2);
-	ROUND1(C, D, A, B, 2, Sc, 3);
-	ROUND1(B, C, D, A, 3, Sd, 4);
-	ROUND1(A, B, C, D, 4, Sa, 5);
-	ROUND1(D, A, B, C, 5, Sb, 6);
-	ROUND1(C, D, A, B, 6, Sc, 7);
-	ROUND1(B, C, D, A, 7, Sd, 8);
-	ROUND1(A, B, C, D, 8, Sa, 9);
-	ROUND1(D, A, B, C, 9, Sb, 10);
-	ROUND1(C, D, A, B, 10, Sc, 11);
-	ROUND1(B, C, D, A, 11, Sd, 12);
-	ROUND1(A, B, C, D, 12, Sa, 13);
-	ROUND1(D, A, B, C, 13, Sb, 14);
-	ROUND1(C, D, A, B, 14, Sc, 15);
-	ROUND1(B, C, D, A, 15, Sd, 16);
-
-	ROUND2(A, B, C, D, 1, Se, 17);
-	ROUND2(D, A, B, C, 6, Sf, 18);
-	ROUND2(C, D, A, B, 11, Sg, 19);
-	ROUND2(B, C, D, A, 0, Sh, 20);
-	ROUND2(A, B, C, D, 5, Se, 21);
-	ROUND2(D, A, B, C, 10, Sf, 22);
-	ROUND2(C, D, A, B, 15, Sg, 23);
-	ROUND2(B, C, D, A, 4, Sh, 24);
-	ROUND2(A, B, C, D, 9, Se, 25);
-	ROUND2(D, A, B, C, 14, Sf, 26);
-	ROUND2(C, D, A, B, 3, Sg, 27);
-	ROUND2(B, C, D, A, 8, Sh, 28);
-	ROUND2(A, B, C, D, 13, Se, 29);
-	ROUND2(D, A, B, C, 2, Sf, 30);
-	ROUND2(C, D, A, B, 7, Sg, 31);
-	ROUND2(B, C, D, A, 12, Sh, 32);
-
-	ROUND3(A, B, C, D, 5, Si, 33);
-	ROUND3(D, A, B, C, 8, Sj, 34);
-	ROUND3(C, D, A, B, 11, Sk, 35);
-	ROUND3(B, C, D, A, 14, Sl, 36);
-	ROUND3(A, B, C, D, 1, Si, 37);
-	ROUND3(D, A, B, C, 4, Sj, 38);
-	ROUND3(C, D, A, B, 7, Sk, 39);
-	ROUND3(B, C, D, A, 10, Sl, 40);
-	ROUND3(A, B, C, D, 13, Si, 41);
-	ROUND3(D, A, B, C, 0, Sj, 42);
-	ROUND3(C, D, A, B, 3, Sk, 43);
-	ROUND3(B, C, D, A, 6, Sl, 44);
-	ROUND3(A, B, C, D, 9, Si, 45);
-	ROUND3(D, A, B, C, 12, Sj, 46);
-	ROUND3(C, D, A, B, 15, Sk, 47);
-	ROUND3(B, C, D, A, 2, Sl, 48);
-
-	ROUND4(A, B, C, D, 0, Sm, 49);
-	ROUND4(D, A, B, C, 7, Sn, 50);
-	ROUND4(C, D, A, B, 14, So, 51);
-	ROUND4(B, C, D, A, 5, Sp, 52);
-	ROUND4(A, B, C, D, 12, Sm, 53);
-	ROUND4(D, A, B, C, 3, Sn, 54);
-	ROUND4(C, D, A, B, 10, So, 55);
-	ROUND4(B, C, D, A, 1, Sp, 56);
-	ROUND4(A, B, C, D, 8, Sm, 57);
-	ROUND4(D, A, B, C, 15, Sn, 58);
-	ROUND4(C, D, A, B, 6, So, 59);
-	ROUND4(B, C, D, A, 13, Sp, 60);
-	ROUND4(A, B, C, D, 4, Sm, 61);
-	ROUND4(D, A, B, C, 11, Sn, 62);
-	ROUND4(C, D, A, B, 2, So, 63);
-	ROUND4(B, C, D, A, 9, Sp, 64);
-
-	ctxt->md5_sta += A;
-	ctxt->md5_stb += B;
-	ctxt->md5_stc += C;
-	ctxt->md5_std += D;
-}
diff --git a/contrib/pgcrypto/md5.h b/contrib/pgcrypto/md5.h
deleted file mode 100644
index 3e6e8da5e7..0000000000
--- a/contrib/pgcrypto/md5.h
+++ /dev/null
@@ -1,79 +0,0 @@
-/*	contrib/pgcrypto/md5.h */
-/*	   $KAME: md5.h,v 1.3 2000/02/22 14:01:18 itojun Exp $	   */
-
-/*
- * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
- * 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.
- * 3. Neither the name of the project nor the names of its contributors
- *	  may be used to endorse or promote products derived from this software
- *	  without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE PROJECT 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 PROJECT 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.
- */
-
-#ifndef _NETINET6_MD5_H_
-#define _NETINET6_MD5_H_
-
-#define MD5_BUFLEN	64
-
-typedef struct
-{
-	union
-	{
-		uint32		md5_state32[4];
-		uint8		md5_state8[16];
-	}			md5_st;
-
-#define md5_sta		md5_st.md5_state32[0]
-#define md5_stb		md5_st.md5_state32[1]
-#define md5_stc		md5_st.md5_state32[2]
-#define md5_std		md5_st.md5_state32[3]
-#define md5_st8		md5_st.md5_state8
-
-	union
-	{
-		uint64		md5_count64;
-		uint8		md5_count8[8];
-	}			md5_count;
-#define md5_n	md5_count.md5_count64
-#define md5_n8	md5_count.md5_count8
-
-	unsigned int md5_i;
-	uint8		md5_buf[MD5_BUFLEN];
-} md5_ctxt;
-
-extern void md5_init(md5_ctxt *);
-extern void md5_loop(md5_ctxt *, const uint8 *, unsigned int);
-extern void md5_pad(md5_ctxt *);
-extern void md5_result(uint8 *, md5_ctxt *);
-
-/* compatibility */
-#define MD5_CTX		md5_ctxt
-#define MD5Init(x)	md5_init((x))
-#define MD5Update(x, y, z)	md5_loop((x), (y), (z))
-#define MD5Final(x, y) \
-do {				\
-	md5_pad((y));		\
-	md5_result((x), (y));	\
-} while (0)
-
-#endif							/* ! _NETINET6_MD5_H_ */