diff --git a/scsh/md5.c b/scsh/md5.c new file mode 100644 index 0000000..8bc73d0 --- /dev/null +++ b/scsh/md5.c @@ -0,0 +1,335 @@ +/* +* 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 /* 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<>(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); +} diff --git a/scsh/md5.scm b/scsh/md5.scm new file mode 100644 index 0000000..7350168 --- /dev/null +++ b/scsh/md5.scm @@ -0,0 +1,87 @@ +(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") + diff --git a/scsh/scsh-interfaces.scm b/scsh/scsh-interfaces.scm index d3e0ad1..5fc2095 100644 --- a/scsh/scsh-interfaces.scm +++ b/scsh/scsh-interfaces.scm @@ -1124,4 +1124,18 @@ with-syslog-channel)) (define-interface crypt-interface - (export crypt)) \ No newline at end of file + (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)) \ No newline at end of file diff --git a/scsh/scsh-package.scm b/scsh/scsh-package.scm index 746e4b3..8487c09 100644 --- a/scsh/scsh-package.scm +++ b/scsh/scsh-package.scm @@ -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)) \ No newline at end of file