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Added md5 support.

This commit is contained in:
mainzelm 2002-06-27 12:14:23 +00:00
parent 16fdcca89f
commit 1aadf4e87f
4 changed files with 448 additions and 1 deletions
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335
scsh/md5.c Normal file
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/*
* This code implements the MD5 message-digest algorithm.
* The algorithm is due to Ron Rivest. This code was
* written by Colin Plumb in 1993, no copyright is claimed.
* This code is in the public domain; do with it what you wish.
*
* Equivalent code is available from RSA Data Security, Inc.
* This code has been tested against that, and is equivalent,
* except that you don't need to include two pages of legalese
* with every copy.
*
* To compute the message digest of a chunk of bytes, declare an
* MD5Context structure, pass it to MD5Init, call MD5Update as
* needed on buffers full of bytes, and then call MD5Final, which
* will fill a supplied 16-byte array with the digest.
*/
#include <string.h> /* for memcpy() */
/*
scsh specific changes by Martin Gasbichler:
- inlined the header file
- made all MD5 procedures static
- define HIGHFIRST according to WORDS_BIGENDIAN
- included scheme48.h
- added the stub functions
*/
#include "sysdep.h"
#include "scheme48.h"
typedef unsigned long uint32;
struct MD5Context {
uint32 buf[4];
uint32 bits[2];
unsigned char in[64];
};
static void MD5Init(struct MD5Context *context);
static void MD5Update(struct MD5Context *context, unsigned char const *buf,
unsigned len);
static void MD5Final(unsigned char digest[16], struct MD5Context *context);
static void MD5Transform(uint32 buf[4], uint32 const in[16]);
typedef struct MD5Context MD5_CTX;
#ifdef WORDS_BIGENDIAN
#define HIGHFIRST
#endif
#ifndef HIGHFIRST
#define byteReverse(buf, len) /* Nothing */
#else
static void byteReverse(unsigned char *buf, unsigned longs);
#ifndef ASM_MD5
/*
* Note: this code is harmless on little-endian machines.
*/
static void
byteReverse(unsigned char *buf, unsigned longs)
{
uint32 t;
do {
t = (uint32) ((unsigned) buf[3] << 8 | buf[2]) << 16 |
((unsigned) buf[1] << 8 | buf[0]);
*(uint32 *) buf = t;
buf += 4;
} while (--longs);
}
#endif
#endif
/*
* Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
* initialization constants.
*/
static void
MD5Init(struct MD5Context *ctx)
{
ctx->buf[0] = 0x67452301;
ctx->buf[1] = 0xefcdab89;
ctx->buf[2] = 0x98badcfe;
ctx->buf[3] = 0x10325476;
ctx->bits[0] = 0;
ctx->bits[1] = 0;
}
/*
* Update context to reflect the concatenation of another buffer full
* of bytes.
*/
static void
MD5Update(struct MD5Context *ctx, unsigned char const *buf, unsigned len)
{
uint32 t;
/* Update bitcount */
t = ctx->bits[0];
if ((ctx->bits[0] = t + ((uint32) len << 3)) < t)
ctx->bits[1]++; /* Carry from low to high */
ctx->bits[1] += len >> 29;
t = (t >> 3) & 0x3f; /* Bytes already in shsInfo->data */
/* Handle any leading odd-sized chunks */
if (t) {
unsigned char *p = (unsigned char *) ctx->in + t;
t = 64 - t;
if (len < t) {
memcpy(p, buf, len);
return;
}
memcpy(p, buf, t);
byteReverse(ctx->in, 16);
MD5Transform(ctx->buf, (uint32 *) ctx->in);
buf += t;
len -= t;
}
/* Process data in 64-byte chunks */
while (len >= 64) {
memcpy(ctx->in, buf, 64);
byteReverse(ctx->in, 16);
MD5Transform(ctx->buf, (uint32 *) ctx->in);
buf += 64;
len -= 64;
}
/* Handle any remaining bytes of data. */
memcpy(ctx->in, buf, len);
}
/*
* Final wrapup - pad to 64-byte boundary with the bit pattern
* 1 0* (64-bit count of bits processed, MSB-first)
*/
static void
MD5Final(unsigned char digest[16], struct MD5Context *ctx)
{
unsigned count;
unsigned char *p;
/* Compute number of bytes mod 64 */
count = (ctx->bits[0] >> 3) & 0x3F;
/* Set the first char of padding to 0x80. This is safe since there is
always at least one byte free */
p = ctx->in + count;
*p++ = 0x80;
/* Bytes of padding needed to make 64 bytes */
count = 64 - 1 - count;
/* Pad out to 56 mod 64 */
if (count < 8) {
/* Two lots of padding: Pad the first block to 64 bytes */
memset(p, 0, count);
byteReverse(ctx->in, 16);
MD5Transform(ctx->buf, (uint32 *) ctx->in);
/* Now fill the next block with 56 bytes */
memset(ctx->in, 0, 56);
} else {
/* Pad block to 56 bytes */
memset(p, 0, count - 8);
}
byteReverse(ctx->in, 14);
/* Append length in bits and transform */
((uint32 *) ctx->in)[14] = ctx->bits[0];
((uint32 *) ctx->in)[15] = ctx->bits[1];
MD5Transform(ctx->buf, (uint32 *) ctx->in);
byteReverse((unsigned char *) ctx->buf, 4);
memcpy(digest, ctx->buf, 16);
memset((char *) ctx, 0, sizeof(ctx)); /* In case it's sensitive */
}
#ifndef ASM_MD5
/* The four core functions - F1 is optimized somewhat */
/* #define F1(x, y, z) (x & y | ~x & z) */
#define F1(x, y, z) (z ^ (x & (y ^ z)))
#define F2(x, y, z) F1(z, x, y)
#define F3(x, y, z) (x ^ y ^ z)
#define F4(x, y, z) (y ^ (x | ~z))
/* This is the central step in the MD5 algorithm. */
#define MD5STEP(f, w, x, y, z, data, s) \
( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )
/*
* The core of the MD5 algorithm, this alters an existing MD5 hash to
* reflect the addition of 16 longwords of new data. MD5Update blocks
* the data and converts bytes into longwords for this routine.
*/
static void
MD5Transform(uint32 buf[4], uint32 const in[16])
{
register uint32 a, b, c, d;
a = buf[0];
b = buf[1];
c = buf[2];
d = buf[3];
MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
buf[0] += a;
buf[1] += b;
buf[2] += c;
buf[3] += d;
}
#endif
/*
* S48 stub functions for the procedures above.
* Added by Martin Gasbichler.
*
*/
static s48_value make_context(void);
static s48_value MD5Init_stub(s48_value sch_context);
static s48_value MD5Update_stub (s48_value sch_context, s48_value input);
static s48_value MD5Final_stub (s48_value sch_context);
static s48_value make_MD5_CTX(void){
return S48_MAKE_VALUE(MD5_CTX);
}
static MD5_CTX* extract_context(s48_value sch_context){
return S48_EXTRACT_VALUE_POINTER (sch_context, MD5_CTX);
}
static s48_value MD5Init_stub(s48_value sch_context){
MD5Init (extract_context (sch_context));
return S48_UNSPECIFIC;
}
static s48_value MD5Update_stub (s48_value sch_context, s48_value input){
MD5Update (extract_context (sch_context),
s48_extract_string (input),
S48_STRING_LENGTH (input));
return S48_UNSPECIFIC;
}
static s48_value MD5Final_stub (s48_value sch_context){
unsigned char digest[16];
int i;
MD5Final (digest, extract_context (sch_context));
return (s48_enter_substring (digest, 16));
}
void s48_init_md5 (void){
S48_EXPORT_FUNCTION (make_MD5_CTX);
S48_EXPORT_FUNCTION (MD5Init_stub);
S48_EXPORT_FUNCTION (MD5Update_stub);
S48_EXPORT_FUNCTION (MD5Final_stub);
}

87
scsh/md5.scm Normal file
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(define-record-type md5-context :md5-context
(really-make-md5-context c-context final? init?)
md5-context?
(c-context md5-c-context)
(final? md5-context-final? set-md5-context-final?!)
(init? md5-context-init? set-md5-context-init?!))
(define (make-md5-context)
(let ((context (really-make-md5-context (make-md5-ctx) #f #f)))
(init-md5-context! context)
context))
(define (init-md5-context! context)
(md5-init! (md5-c-context context))
(set-md5-context-init?! context #t)
(set-md5-context-final?! context #f))
(define (update-md5-context! context string)
(if (not (md5-context-init? context))
(error "md5 context not initialized" context))
(if (md5-context-final? context)
(error "tried to update final md5 context" context))
(md5-update! (md5-c-context context) string))
(define (md5-context->md5-digest context)
(if (not (md5-context-init? context))
(error "md5 context not initialized" context))
(let((digest-as-string (md5-final! (md5-c-context context))))
(set-md5-context-final?! context #t)
(make-md5-digest (bits128->number digest-as-string))))
(define-record-type md5-digest :md5-digest
(make-md5-digest value)
md5-digest?
(value md5-digest-value))
(define number->md5-digest
(let ((bit128-mask (- (expt 2 128) 1)))
(lambda (n)
(if (and (>= n 0)
(<= n bit128-mask))
(make-md5-digest n)
(error "Argument to number->md5-digest not a 128 bit number" n)))))
(define md5-digest->number md5-digest-value)
(define (bits128->number bits-as-string)
(car
(string-fold-right
(lambda (c number.arity)
(let ((number (car number.arity))
(arity (cdr number.arity)))
(cons (bitwise-ior number
(arithmetic-shift (char->ascii c) (* arity 8)))
(+ arity 1))))
(cons 0 0)
bits-as-string)))
(define (md5-digest-for-string s)
(let ((context (make-md5-context)))
(init-md5-context! context)
(update-md5-context! context s)
(md5-context->md5-digest context)))
(define (md5-digest-for-port port . maybe-buffer-size)
(let* ((buffer-size (if (null? maybe-buffer-size) 1024 (car maybe-buffer-size)))
(buffer (make-string buffer-size))
(context (make-md5-context)))
(init-md5-context! context)
(let lp ()
(let ((got (read-block buffer 0 buffer-size port)))
(cond ((< got buffer-size)
(if (not (eof-object? (peek-char port)))
(error "read-block didn't read port to the end"))
(update-md5-context! context (substring buffer 0 got))
(md5-context->md5-digest context))
(else
(update-md5-context! context buffer)
(lp)))))))
(import-lambda-definition make-md5-ctx () "make_MD5_CTX")
(import-lambda-definition md5-init! (context) "MD5Init_stub")
(import-lambda-definition md5-update! (context string) "MD5Update_stub")
(import-lambda-definition md5-final! (context) "MD5Final_stub")

14
scsh/scsh-interfaces.scm
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@ -1125,3 +1125,17 @@
(define-interface crypt-interface
(export crypt))
(define-interface md5-interface
(export make-md5-context
md5-context?
update-md5-context!
md5-context->md5-digest
md5-digest?
md5-digest->number
number->md5-digest
md5-digest-for-string
md5-digest-for-port))

11
scsh/scsh-package.scm
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@ -497,3 +497,14 @@
(subset command-processor (user-command-environment))
(subset scsh-startup-package (dump-scsh-program)))
(files libscsh))
(define-structure md5 md5-interface
(open scheme
ascii
define-record-types
bitwise
(subset i/o (read-block))
(subset srfi-13 (string-fold-right))
signals
external-calls)
(files md5))