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+/* MD2C.C - RSA Data Security, Inc., MD2 message-digest algorithm
+ */
+
+/* Copyright (C) 1990-2, RSA Data Security, Inc. Created 1990. All
+ rights reserved.
+
+ License to copy and use this software is granted for
+ non-commercial Internet Privacy-Enhanced Mail provided that it is
+ identified as the "RSA Data Security, Inc. MD2 Message Digest
+ Algorithm" in all material mentioning or referencing this software
+ or this function.
+
+ RSA Data Security, Inc. makes no representations concerning either
+ the merchantability of this software or the suitability of this
+ software for any particular purpose. It is provided "as is"
+ without express or implied warranty of any kind.
+
+ These notices must be retained in any copies of any part of this
+ documentation and/or software.
+ */
+
+#include "md2.h"
+
+#define HAVEMEMCOPY 1 /* use ISO C's memcpy and memset */
+
+static void MD2Transform PROTO_LIST
+ ((unsigned char [16], unsigned char [16], const unsigned char [16]));
+
+#ifdef HAVEMEMCOPY
+#include <memory.h>
+#define MD2_memcpy memcpy
+#define MD2_memset memset
+#else
+#ifdef HAVEBCOPY
+#define MD2_memcpy(_a,_b,_c) memcpy((_a), (_b),(_c))
+#define MD2_memset(_a,_b,_c) memset((_a), '\0',(_c))
+#else
+static void MD2_memcpy PROTO_LIST ((POINTER, CONST_POINTER, unsigned int));
+static void MD2_memset PROTO_LIST ((POINTER, int, unsigned int));
+#endif
+#endif
+
+/* Permutation of 0..255 constructed from the digits of pi. It gives a
+ "random" nonlinear byte substitution operation.
+ */
+static unsigned char PI_SUBST[256] = {
+ 41, 46, 67, 201, 162, 216, 124, 1, 61, 54, 84, 161, 236, 240, 6,
+ 19, 98, 167, 5, 243, 192, 199, 115, 140, 152, 147, 43, 217, 188,
+ 76, 130, 202, 30, 155, 87, 60, 253, 212, 224, 22, 103, 66, 111, 24,
+ 138, 23, 229, 18, 190, 78, 196, 214, 218, 158, 222, 73, 160, 251,
+ 245, 142, 187, 47, 238, 122, 169, 104, 121, 145, 21, 178, 7, 63,
+ 148, 194, 16, 137, 11, 34, 95, 33, 128, 127, 93, 154, 90, 144, 50,
+ 39, 53, 62, 204, 231, 191, 247, 151, 3, 255, 25, 48, 179, 72, 165,
+ 181, 209, 215, 94, 146, 42, 172, 86, 170, 198, 79, 184, 56, 210,
+ 150, 164, 125, 182, 118, 252, 107, 226, 156, 116, 4, 241, 69, 157,
+ 112, 89, 100, 113, 135, 32, 134, 91, 207, 101, 230, 45, 168, 2, 27,
+ 96, 37, 173, 174, 176, 185, 246, 28, 70, 97, 105, 52, 64, 126, 15,
+ 85, 71, 163, 35, 221, 81, 175, 58, 195, 92, 249, 206, 186, 197,
+ 234, 38, 44, 83, 13, 110, 133, 40, 132, 9, 211, 223, 205, 244, 65,
+ 129, 77, 82, 106, 220, 55, 200, 108, 193, 171, 250, 36, 225, 123,
+ 8, 12, 189, 177, 74, 120, 136, 149, 139, 227, 99, 232, 109, 233,
+ 203, 213, 254, 59, 0, 29, 57, 242, 239, 183, 14, 102, 88, 208, 228,
+ 166, 119, 114, 248, 235, 117, 75, 10, 49, 68, 80, 180, 143, 237,
+ 31, 26, 219, 153, 141, 51, 159, 17, 131, 20
+};
+
+static const unsigned char *PADDING[] = {
+ (const unsigned char *)"",
+ (const unsigned char *)"\001",
+ (const unsigned char *)"\002\002",
+ (const unsigned char *)"\003\003\003",
+ (const unsigned char *)"\004\004\004\004",
+ (const unsigned char *)"\005\005\005\005\005",
+ (const unsigned char *)"\006\006\006\006\006\006",
+ (const unsigned char *)"\007\007\007\007\007\007\007",
+ (const unsigned char *)"\010\010\010\010\010\010\010\010",
+ (const unsigned char *)"\011\011\011\011\011\011\011\011\011",
+ (const unsigned char *)"\012\012\012\012\012\012\012\012\012\012",
+ (const unsigned char *)"\013\013\013\013\013\013\013\013\013\013\013",
+ (const unsigned char *)"\014\014\014\014\014\014\014\014\014\014\014\014",
+ (const unsigned char *)
+ "\015\015\015\015\015\015\015\015\015\015\015\015\015",
+ (const unsigned char *)
+ "\016\016\016\016\016\016\016\016\016\016\016\016\016\016",
+ (const unsigned char *)
+ "\017\017\017\017\017\017\017\017\017\017\017\017\017\017\017",
+ (const unsigned char *)
+ "\020\020\020\020\020\020\020\020\020\020\020\020\020\020\020\020"
+};
+
+/* MD2 initialization. Begins an MD2 operation, writing a new context.
+ */
+void MD2Init (context)
+MD2_CTX *context; /* context */
+{
+ context->count = 0;
+ MD2_memset ((POINTER)context->state, 0, sizeof (context->state));
+ MD2_memset
+ ((POINTER)context->checksum, 0, sizeof (context->checksum));
+}
+
+/* MD2 block update operation. Continues an MD2 message-digest
+ operation, processing another message block, and updating the
+ context.
+ */
+void MD2Update (context, input, inputLen)
+MD2_CTX *context; /* context */
+const unsigned char *input; /* input block */
+unsigned int inputLen; /* length of input block */
+{
+ unsigned int i, index, partLen;
+
+ /* Update number of bytes mod 16 */
+ index = context->count;
+ context->count = (index + inputLen) & 0xf;
+
+ partLen = 16 - index;
+
+ /* Transform as many times as possible.
+ */
+ if (inputLen >= partLen) {
+ MD2_memcpy
+ ((POINTER)&context->buffer[index], (CONST_POINTER)input, partLen);
+ MD2Transform (context->state, context->checksum, context->buffer);
+
+ for (i = partLen; i + 15 < inputLen; i += 16)
+ MD2Transform (context->state, context->checksum, &input[i]);
+
+ index = 0;
+ }
+ else
+ i = 0;
+
+ /* Buffer remaining input */
+ MD2_memcpy
+ ((POINTER)&context->buffer[index], (CONST_POINTER)&input[i],
+ inputLen-i);
+}
+
+/* MD2 finalization. Ends an MD2 message-digest operation, writing the
+ message digest and zeroizing the context.
+ */
+void MD2Final (digest, context)
+
+unsigned char digest[16]; /* message digest */
+MD2_CTX *context; /* context */
+{
+ unsigned int index, padLen;
+
+ /* Pad out to multiple of 16.
+ */
+ index = context->count;
+ padLen = 16 - index;
+ MD2Update (context, PADDING[padLen], padLen);
+
+ /* Extend with checksum */
+ MD2Update (context, context->checksum, 16);
+
+ /* Store state in digest */
+ MD2_memcpy ((POINTER)digest, (POINTER)context->state, 16);
+
+ /* Zeroize sensitive information.
+ */
+ MD2_memset ((POINTER)context, 0, sizeof (*context));
+}
+
+/* MD2 basic transformation. Transforms state and updates checksum
+ based on block.
+ */
+static void MD2Transform (state, checksum, block)
+unsigned char state[16];
+unsigned char checksum[16];
+const unsigned char block[16];
+{
+ unsigned int i, j, t;
+ unsigned char x[48];
+
+ /* Form encryption block from state, block, state ^ block.
+ */
+ MD2_memcpy ((POINTER)x, (CONST_POINTER)state, 16);
+ MD2_memcpy ((POINTER)x+16, (CONST_POINTER)block, 16);
+ for (i = 0; i < 16; i++)
+ x[i+32] = state[i] ^ block[i];
+
+ /* Encrypt block (18 rounds).
+ */
+ t = 0;
+ for (i = 0; i < 18; i++) {
+ for (j = 0; j < 48; j++)
+ t = x[j] ^= PI_SUBST[t];
+ t = (t + i) & 0xff;
+ }
+
+ /* Save new state */
+ MD2_memcpy ((POINTER)state, (POINTER)x, 16);
+
+ /* Update checksum.
+ */
+ t = checksum[15];
+ for (i = 0; i < 16; i++)
+ t = checksum[i] ^= PI_SUBST[block[i] ^ t];
+
+ /* Zeroize sensitive information.
+ */
+ MD2_memset ((POINTER)x, 0, sizeof (x));
+}
+
+#ifndef HAVEMEMCOPY
+#ifndef HAVEBCOPY
+/* Note: Replace "for loop" with standard memcpy if possible.
+ */
+static void MD2_memcpy (output, input, len)
+POINTER output;
+POINTER input;
+unsigned int len;
+{
+ unsigned int i;
+
+ for (i = 0; i < len; i++)
+ output[i] = input[i];
+}
+
+/* Note: Replace "for loop" with standard memset if possible.
+ */
+static void MD2_memset (output, value, len)
+POINTER output;
+int value;
+unsigned int len;
+{
+ unsigned int i;
+
+ for (i = 0; i < len; i++)
+ ((char *)output)[i] = (char)value;
+}
+#endif
+#endif
+
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