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- /* @(#)md5.c 10.1 3/25/94 08:04:10 */
- /*
- * md5 - RSA Data Security, Inc. MD5 Message-Digest Algorithm
- *
- * LANDON CURT NOLL DISCLAIMS ALL WARRANTIES WITH REGARD TO
- * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MER-
- * CHANTABILITY AND FITNESS. IN NO EVENT SHALL LANDON CURT
- * NOLL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
- * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
- * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
- * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
- * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- *
- * See md5drvr.c for version and modification history.
- */
-
- /*
- ***********************************************************************
- ** Copyright (C) 1990, RSA Data Security, Inc. All rights reserved. **
- ** **
- ** License to copy and use this software is granted provided that **
- ** it is identified as the "RSA Data Security, Inc. MD5 Message- **
- ** Digest Algorithm" in all material mentioning or referencing this **
- ** software or this function. **
- ** **
- ** License is also granted to make and use derivative works **
- ** provided that such works are identified as "derived from the RSA **
- ** Data Security, Inc. MD5 Message-Digest Algorithm" in all **
- ** material mentioning or referencing the derived work. **
- ** **
- ** 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. **
- ***********************************************************************
- */
-
- /*
- ***********************************************************************
- ** Message-digest routines: **
- ** To form the message digest for a message M **
- ** (1) Initialize a context buffer md5Ctx using MD5Init **
- ** (2) Call MD5Update on md5Ctx and M **
- ** (3) Call MD5Final on md5Ctx **
- ** The message digest is now in md5Ctx->digest[0...15] **
- ***********************************************************************
- */
-
-
- #include "md5.h"
- #include "align.h"
- #include "endian.h"
-
- char *MD5_what="@(#)"; /* #(@) if checked in */
-
- /* almost zero fill */
- static BYTE PADDING[MD5_CHUNKSIZE] = {
- 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
- };
-
- /*
- * The F, G, H and I are basic MD5 functions. The following
- * identity saves one boolean operation.
- *
- * F: (((x) & (y)) | (~(x) & (z))) == ((z) ^ ((x) & ((y) ^ (z))))
- * G: (((x) & (z)) | ((y) & ~(z))) == ((y) ^ ((z) & ((x) ^ (y))))
- */
- /* F, G, H and I are basic MD5 functions */
- #define F(x, y, z) ((z) ^ ((x) & ((y) ^ (z))))
- #define G(x, y, z) ((y) ^ ((z) & ((x) ^ (y))))
- #define H(x, y, z) ((x) ^ (y) ^ (z))
- #define I(x, y, z) ((y) ^ ((x) | (~z)))
-
- /* rotate a 32 bit value */
- #define ROT(X,n) (((X)<<(n)) | ((X)>>(32-(n))))
-
- /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4 */
- /* Rotation is separate from addition to prevent recomputation */
- #define S11 7
- #define S12 12
- #define S13 17
- #define S14 22
- #define FF(a, b, c, d, x, s, ac) \
- {(a) += F((b), (c), (d)) + (x) + (ULONG)(ac); \
- (a) = ROT((a), (s)); \
- (a) += (b); \
- }
- #define S21 5
- #define S22 9
- #define S23 14
- #define S24 20
- #define GG(a, b, c, d, x, s, ac) \
- {(a) += G((b), (c), (d)) + (x) + (ULONG)(ac); \
- (a) = ROT((a), (s)); \
- (a) += (b); \
- }
- #define S31 4
- #define S32 11
- #define S33 16
- #define S34 23
- #define HH(a, b, c, d, x, s, ac) \
- {(a) += H((b), (c), (d)) + (x) + (ULONG)(ac); \
- (a) = ROT((a), (s)); \
- (a) += (b); \
- }
- #define S41 6
- #define S42 10
- #define S43 15
- #define S44 21
- #define II(a, b, c, d, x, s, ac) \
- {(a) += I((b), (c), (d)) + (x) + (ULONG)(ac); \
- (a) = ROT((a), (s)); \
- (a) += (b); \
- }
-
- /* forward declaration */
- static void MD5Transform P((ULONG*, ULONG*));
- static ULONG in[MD5_CHUNKWORDS];
-
-
- /*
- * MD5Init - initiale the message-digest context
- *
- * The routine MD5Init initializes the message-digest context
- * md5Ctx. All fields are set to zero.
- */
- void
- MD5Init(md5Ctx)
- MD5_CTX *md5Ctx;
- {
- /* load magic initialization constants */
- md5Ctx->buf[0] = (ULONG)0x67452301;
- md5Ctx->buf[1] = (ULONG)0xefcdab89;
- md5Ctx->buf[2] = (ULONG)0x98badcfe;
- md5Ctx->buf[3] = (ULONG)0x10325476;
-
- /* Initialise bit count */
- md5Ctx->countLo = 0L;
- md5Ctx->countHi = 0L;
- md5Ctx->datalen = 0L;
- }
-
-
- /*
- * MD5Update - update message-digest context
- *
- * The routine MD5Update updates the message-digest context to
- * account for the presence of each of the characters inBuf[0..inLen-1]
- * in the message whose digest is being computed.
- */
- void
- MD5Update(md5Ctx, inBuf, count)
- MD5_CTX *md5Ctx;
- BYTE *inBuf;
- UINT count;
- {
- ULONG datalen = md5Ctx->datalen;
- #if BYTE_ORDER == BIG_ENDIAN
- ULONG tmp;
- int cnt;
- #endif
-
- /*
- * Catch the case of a non-empty data inBuf
- */
- if (datalen > 0) {
-
- /* determine the size we need to copy */
- ULONG cpylen = MD5_CHUNKSIZE - datalen;
-
- /* case: new data will not fill the inBuf */
- if (cpylen > count) {
- memcpy((char *)(md5Ctx->in_byte)+datalen, (char *)inBuf, count);
- md5Ctx->datalen = datalen+count;
- return;
-
- /* case: inBuf will be filled */
- } else {
- memcpy((char *)(md5Ctx->in_byte)+datalen, (char *)inBuf, cpylen);
- #if BYTE_ORDER == BIG_ENDIAN
- /* byte swap data into little endian order */
- for (cnt=0; cnt < MD5_CHUNKWORDS; ++cnt) {
- tmp = (md5Ctx->in_ulong[cnt] << 16) |
- (md5Ctx->in_ulong[cnt] >> 16);
- in[cnt] = ((tmp & 0xFF00FF00L) >> 8) |
- ((tmp & 0x00FF00FFL) << 8);
- }
- MD5Transform(md5Ctx->buf, in);
- #else
- MD5Transform(md5Ctx->buf, md5Ctx->in_ulong);
- #endif
- inBuf += cpylen;
- count -= cpylen;
- md5Ctx->datalen = 0;
- }
- }
-
- /*
- * Process data in MD5_CHUNKSIZE chunks
- */
- if (count >= MD5_CHUNKSIZE) {
- MD5fullUpdate(md5Ctx, inBuf, count);
- inBuf += (count/MD5_CHUNKSIZE)*MD5_CHUNKSIZE;
- count %= MD5_CHUNKSIZE;
- }
-
- /*
- * Handle any remaining bytes of data.
- * This should only happen once on the final lot of data
- */
- if (count > 0) {
- memcpy(md5Ctx->in_byte, inBuf, count);
- }
- md5Ctx->datalen = count;
- }
-
-
- /*
- * MD5fullUpdate - update message-digest context with a full set of chunks
- *
- * The routine MD5Update updates the message-digest context to
- * account for the presence of each of the characters inBuf[0..inLen-1]
- * in the message whose digest is being computed.
- *
- * Unlike MD5Update, this routine will assume that the input length is
- * a mulitple of MD5_CHUNKSIZE bytes long.
- */
- void
- MD5fullUpdate(md5Ctx, inBuf, count)
- MD5_CTX *md5Ctx;
- BYTE *inBuf;
- UINT count;
- {
- #if BYTE_ORDER == BIG_ENDIAN
- ULONG tmp;
- int cnt;
- #endif
-
- /*
- * Process data in MD5_CHUNKSIZE chunks
- */
- while (count >= MD5_CHUNKSIZE) {
- #if defined(MUST_ALIGN)
- memcpy(in, inBuf, MD5_CHUNKSIZE);
- #if BYTE_ORDER == BIG_ENDIAN
- /* byte swap data into little endian order */
- for (cnt=0; cnt < MD5_CHUNKWORDS; ++cnt) {
- tmp = (in[cnt] << 16) | (in[cnt] >> 16);
- in[cnt] = ((tmp & 0xFF00FF00L) >> 8) | ((tmp & 0x00FF00FFL) << 8);
- }
- #endif
- MD5Transform(md5Ctx->buf, in);
- #else
- #if BYTE_ORDER == LITTLE_ENDIAN
- MD5Transform(md5Ctx->buf, (ULONG *)inBuf);
- #else
- /* byte swap data into little endian order */
- for (cnt=0; cnt < MD5_CHUNKWORDS; ++cnt) {
- tmp = (((ULONG *)inBuf)[cnt] << 16) | (((ULONG *)inBuf)[cnt] >> 16);
- in[cnt] = ((tmp & 0xFF00FF00L) >> 8) | ((tmp & 0x00FF00FFL) << 8);
- }
- MD5Transform(md5Ctx->buf, in);
- #endif
- #endif
- inBuf += MD5_CHUNKSIZE;
- count -= MD5_CHUNKSIZE;
- }
- }
-
-
- /*
- * MD5Final - terminate the message-digest computation
- *
- * The routine MD5Final terminates the message-digest computation and
- * ends with the desired message digest in md5Ctx->digest[0...15].
- */
- void
- MD5Final(md5Ctx)
- MD5_CTX *md5Ctx;
- {
- UINT padLen;
- int count = md5Ctx->datalen;
- ULONG lowBitcount = md5Ctx->countLo;
- ULONG highBitcount = md5Ctx->countHi;
- #if BYTE_ORDER == BIG_ENDIAN
- ULONG tmp;
- UINT i, ii;
- #endif
-
- /* pad out to 56 mod MD5_CHUNKSIZE */
- padLen = (count < 56) ? (56 - count) : (120 - count);
- MD5Update(md5Ctx, PADDING, padLen);
-
- /* append length in bits and transform */
- #if BYTE_ORDER == BIG_ENDIAN
- for (i = 0; i < 14; i++) {
- tmp = (md5Ctx->in_ulong[i] << 16) | (md5Ctx->in_ulong[i] >> 16);
- md5Ctx->in_ulong[i] = ((tmp & 0xFF00FF00L) >> 8) |
- ((tmp & 0x00FF00FFL) << 8);
- }
- #endif
- md5Ctx->in_ulong[MD5_LOW] = (lowBitcount << 3);
- md5Ctx->in_ulong[MD5_HIGH] = (highBitcount << 3) | (lowBitcount >> 29);
- MD5Transform(md5Ctx->buf, md5Ctx->in_ulong);
-
- /* store buffer in digest */
- #if BYTE_ORDER == LITTLE_ENDIAN
- memcpy((char *)md5Ctx->digest, (char *)md5Ctx->buf, sizeof(md5Ctx->digest));
- #else
- for (i = 0, ii = 0; i < MD5_DIGESTWORDS; i++, ii += 4) {
- md5Ctx->digest[ii] = (BYTE)(md5Ctx->buf[i] & 0xFF);
- md5Ctx->digest[ii+1] = (BYTE)((md5Ctx->buf[i] >> 8) & 0xFF);
- md5Ctx->digest[ii+2] = (BYTE)((md5Ctx->buf[i] >> 16) & 0xFF);
- md5Ctx->digest[ii+3] = (BYTE)((md5Ctx->buf[i] >> 24) & 0xFF);
- }
- #endif
- }
-
-
- /*
- * Basic MD5 step. Transforms buf based on in.
- */
- static void
- MD5Transform(buf, in)
- ULONG *buf;
- ULONG *in;
- {
- ULONG a = buf[0], b = buf[1], c = buf[2], d = buf[3];
-
- /* Round 1 */
- FF( a, b, c, d, in[ 0], S11, 3614090360UL); /* 1 */
- FF( d, a, b, c, in[ 1], S12, 3905402710UL); /* 2 */
- FF( c, d, a, b, in[ 2], S13, 606105819UL); /* 3 */
- FF( b, c, d, a, in[ 3], S14, 3250441966UL); /* 4 */
- FF( a, b, c, d, in[ 4], S11, 4118548399UL); /* 5 */
- FF( d, a, b, c, in[ 5], S12, 1200080426UL); /* 6 */
- FF( c, d, a, b, in[ 6], S13, 2821735955UL); /* 7 */
- FF( b, c, d, a, in[ 7], S14, 4249261313UL); /* 8 */
- FF( a, b, c, d, in[ 8], S11, 1770035416UL); /* 9 */
- FF( d, a, b, c, in[ 9], S12, 2336552879UL); /* 10 */
- FF( c, d, a, b, in[10], S13, 4294925233UL); /* 11 */
- FF( b, c, d, a, in[11], S14, 2304563134UL); /* 12 */
- FF( a, b, c, d, in[12], S11, 1804603682UL); /* 13 */
- FF( d, a, b, c, in[13], S12, 4254626195UL); /* 14 */
- FF( c, d, a, b, in[14], S13, 2792965006UL); /* 15 */
- FF( b, c, d, a, in[15], S14, 1236535329UL); /* 16 */
-
- /* Round 2 */
- GG( a, b, c, d, in[ 1], S21, 4129170786UL); /* 17 */
- GG( d, a, b, c, in[ 6], S22, 3225465664UL); /* 18 */
- GG( c, d, a, b, in[11], S23, 643717713UL); /* 19 */
- GG( b, c, d, a, in[ 0], S24, 3921069994UL); /* 20 */
- GG( a, b, c, d, in[ 5], S21, 3593408605UL); /* 21 */
- GG( d, a, b, c, in[10], S22, 38016083UL); /* 22 */
- GG( c, d, a, b, in[15], S23, 3634488961UL); /* 23 */
- GG( b, c, d, a, in[ 4], S24, 3889429448UL); /* 24 */
- GG( a, b, c, d, in[ 9], S21, 568446438UL); /* 25 */
- GG( d, a, b, c, in[14], S22, 3275163606UL); /* 26 */
- GG( c, d, a, b, in[ 3], S23, 4107603335UL); /* 27 */
- GG( b, c, d, a, in[ 8], S24, 1163531501UL); /* 28 */
- GG( a, b, c, d, in[13], S21, 2850285829UL); /* 29 */
- GG( d, a, b, c, in[ 2], S22, 4243563512UL); /* 30 */
- GG( c, d, a, b, in[ 7], S23, 1735328473UL); /* 31 */
- GG( b, c, d, a, in[12], S24, 2368359562UL); /* 32 */
-
- /* Round 3 */
- HH( a, b, c, d, in[ 5], S31, 4294588738UL); /* 33 */
- HH( d, a, b, c, in[ 8], S32, 2272392833UL); /* 34 */
- HH( c, d, a, b, in[11], S33, 1839030562UL); /* 35 */
- HH( b, c, d, a, in[14], S34, 4259657740UL); /* 36 */
- HH( a, b, c, d, in[ 1], S31, 2763975236UL); /* 37 */
- HH( d, a, b, c, in[ 4], S32, 1272893353UL); /* 38 */
- HH( c, d, a, b, in[ 7], S33, 4139469664UL); /* 39 */
- HH( b, c, d, a, in[10], S34, 3200236656UL); /* 40 */
- HH( a, b, c, d, in[13], S31, 681279174UL); /* 41 */
- HH( d, a, b, c, in[ 0], S32, 3936430074UL); /* 42 */
- HH( c, d, a, b, in[ 3], S33, 3572445317UL); /* 43 */
- HH( b, c, d, a, in[ 6], S34, 76029189UL); /* 44 */
- HH( a, b, c, d, in[ 9], S31, 3654602809UL); /* 45 */
- HH( d, a, b, c, in[12], S32, 3873151461UL); /* 46 */
- HH( c, d, a, b, in[15], S33, 530742520UL); /* 47 */
- HH( b, c, d, a, in[ 2], S34, 3299628645UL); /* 48 */
-
- /* Round 4 */
- II( a, b, c, d, in[ 0], S41, 4096336452UL); /* 49 */
- II( d, a, b, c, in[ 7], S42, 1126891415UL); /* 50 */
- II( c, d, a, b, in[14], S43, 2878612391UL); /* 51 */
- II( b, c, d, a, in[ 5], S44, 4237533241UL); /* 52 */
- II( a, b, c, d, in[12], S41, 1700485571UL); /* 53 */
- II( d, a, b, c, in[ 3], S42, 2399980690UL); /* 54 */
- II( c, d, a, b, in[10], S43, 4293915773UL); /* 55 */
- II( b, c, d, a, in[ 1], S44, 2240044497UL); /* 56 */
- II( a, b, c, d, in[ 8], S41, 1873313359UL); /* 57 */
- II( d, a, b, c, in[15], S42, 4264355552UL); /* 58 */
- II( c, d, a, b, in[ 6], S43, 2734768916UL); /* 59 */
- II( b, c, d, a, in[13], S44, 1309151649UL); /* 60 */
- II( a, b, c, d, in[ 4], S41, 4149444226UL); /* 61 */
- II( d, a, b, c, in[11], S42, 3174756917UL); /* 62 */
- II( c, d, a, b, in[ 2], S43, 718787259UL); /* 63 */
- II( b, c, d, a, in[ 9], S44, 3951481745UL); /* 64 */
-
- buf[0] += a;
- buf[1] += b;
- buf[2] += c;
- buf[3] += d;
- }
-