/* ************************************************************************ */ /* */ /* Neko Standard Library */ /* Copyright (c)2005 Motion-Twin */ /* */ /* This library is free software; you can redistribute it and/or */ /* modify it under the terms of the GNU Lesser General Public */ /* License as published by the Free Software Foundation; either */ /* version 2.1 of the License, or (at your option) any later version. */ /* */ /* This library is distributed in the hope that it will be useful, */ /* but WITHOUT ANY WARRANTY; without even the implied warranty of */ /* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU */ /* Lesser General Public License or the LICENSE file for more details. */ /* */ /* ************************************************************************ */ #include #include /**

MD5

MD5 digest functions

**/ #ifndef uint8 #define uint8 unsigned char #endif #ifndef uint32 #define uint32 unsigned long int #endif typedef struct { uint32 total[2]; uint32 state[4]; uint8 buffer[64]; } md5_context; #define GET_UINT32(n,b,i) \ { \ (n) = ( (uint32) (b)[(i) ] ) \ | ( (uint32) (b)[(i) + 1] << 8 ) \ | ( (uint32) (b)[(i) + 2] << 16 ) \ | ( (uint32) (b)[(i) + 3] << 24 ); \ } #define PUT_UINT32(n,b,i) \ { \ (b)[(i) ] = (uint8) ( (n) ); \ (b)[(i) + 1] = (uint8) ( (n) >> 8 ); \ (b)[(i) + 2] = (uint8) ( (n) >> 16 ); \ (b)[(i) + 3] = (uint8) ( (n) >> 24 ); \ } static void md5_starts( md5_context *ctx ) { ctx->total[0] = 0; ctx->total[1] = 0; ctx->state[0] = 0x67452301; ctx->state[1] = 0xEFCDAB89; ctx->state[2] = 0x98BADCFE; ctx->state[3] = 0x10325476; } static void md5_process( md5_context *ctx, uint8 data[64] ) { uint32 X[16], A, B, C, D; GET_UINT32( X[0], data, 0 ); GET_UINT32( X[1], data, 4 ); GET_UINT32( X[2], data, 8 ); GET_UINT32( X[3], data, 12 ); GET_UINT32( X[4], data, 16 ); GET_UINT32( X[5], data, 20 ); GET_UINT32( X[6], data, 24 ); GET_UINT32( X[7], data, 28 ); GET_UINT32( X[8], data, 32 ); GET_UINT32( X[9], data, 36 ); GET_UINT32( X[10], data, 40 ); GET_UINT32( X[11], data, 44 ); GET_UINT32( X[12], data, 48 ); GET_UINT32( X[13], data, 52 ); GET_UINT32( X[14], data, 56 ); GET_UINT32( X[15], data, 60 ); #define S(x,n) ((x << n) | ((x & 0xFFFFFFFF) >> (32 - n))) #define P(a,b,c,d,k,s,t) \ { \ a += F(b,c,d) + X[k] + t; a = S(a,s) + b; \ } A = ctx->state[0]; B = ctx->state[1]; C = ctx->state[2]; D = ctx->state[3]; #define F(x,y,z) (z ^ (x & (y ^ z))) P( A, B, C, D, 0, 7, 0xD76AA478 ); P( D, A, B, C, 1, 12, 0xE8C7B756 ); P( C, D, A, B, 2, 17, 0x242070DB ); P( B, C, D, A, 3, 22, 0xC1BDCEEE ); P( A, B, C, D, 4, 7, 0xF57C0FAF ); P( D, A, B, C, 5, 12, 0x4787C62A ); P( C, D, A, B, 6, 17, 0xA8304613 ); P( B, C, D, A, 7, 22, 0xFD469501 ); P( A, B, C, D, 8, 7, 0x698098D8 ); P( D, A, B, C, 9, 12, 0x8B44F7AF ); P( C, D, A, B, 10, 17, 0xFFFF5BB1 ); P( B, C, D, A, 11, 22, 0x895CD7BE ); P( A, B, C, D, 12, 7, 0x6B901122 ); P( D, A, B, C, 13, 12, 0xFD987193 ); P( C, D, A, B, 14, 17, 0xA679438E ); P( B, C, D, A, 15, 22, 0x49B40821 ); #undef F #define F(x,y,z) (y ^ (z & (x ^ y))) P( A, B, C, D, 1, 5, 0xF61E2562 ); P( D, A, B, C, 6, 9, 0xC040B340 ); P( C, D, A, B, 11, 14, 0x265E5A51 ); P( B, C, D, A, 0, 20, 0xE9B6C7AA ); P( A, B, C, D, 5, 5, 0xD62F105D ); P( D, A, B, C, 10, 9, 0x02441453 ); P( C, D, A, B, 15, 14, 0xD8A1E681 ); P( B, C, D, A, 4, 20, 0xE7D3FBC8 ); P( A, B, C, D, 9, 5, 0x21E1CDE6 ); P( D, A, B, C, 14, 9, 0xC33707D6 ); P( C, D, A, B, 3, 14, 0xF4D50D87 ); P( B, C, D, A, 8, 20, 0x455A14ED ); P( A, B, C, D, 13, 5, 0xA9E3E905 ); P( D, A, B, C, 2, 9, 0xFCEFA3F8 ); P( C, D, A, B, 7, 14, 0x676F02D9 ); P( B, C, D, A, 12, 20, 0x8D2A4C8A ); #undef F #define F(x,y,z) (x ^ y ^ z) P( A, B, C, D, 5, 4, 0xFFFA3942 ); P( D, A, B, C, 8, 11, 0x8771F681 ); P( C, D, A, B, 11, 16, 0x6D9D6122 ); P( B, C, D, A, 14, 23, 0xFDE5380C ); P( A, B, C, D, 1, 4, 0xA4BEEA44 ); P( D, A, B, C, 4, 11, 0x4BDECFA9 ); P( C, D, A, B, 7, 16, 0xF6BB4B60 ); P( B, C, D, A, 10, 23, 0xBEBFBC70 ); P( A, B, C, D, 13, 4, 0x289B7EC6 ); P( D, A, B, C, 0, 11, 0xEAA127FA ); P( C, D, A, B, 3, 16, 0xD4EF3085 ); P( B, C, D, A, 6, 23, 0x04881D05 ); P( A, B, C, D, 9, 4, 0xD9D4D039 ); P( D, A, B, C, 12, 11, 0xE6DB99E5 ); P( C, D, A, B, 15, 16, 0x1FA27CF8 ); P( B, C, D, A, 2, 23, 0xC4AC5665 ); #undef F #define F(x,y,z) (y ^ (x | ~z)) P( A, B, C, D, 0, 6, 0xF4292244 ); P( D, A, B, C, 7, 10, 0x432AFF97 ); P( C, D, A, B, 14, 15, 0xAB9423A7 ); P( B, C, D, A, 5, 21, 0xFC93A039 ); P( A, B, C, D, 12, 6, 0x655B59C3 ); P( D, A, B, C, 3, 10, 0x8F0CCC92 ); P( C, D, A, B, 10, 15, 0xFFEFF47D ); P( B, C, D, A, 1, 21, 0x85845DD1 ); P( A, B, C, D, 8, 6, 0x6FA87E4F ); P( D, A, B, C, 15, 10, 0xFE2CE6E0 ); P( C, D, A, B, 6, 15, 0xA3014314 ); P( B, C, D, A, 13, 21, 0x4E0811A1 ); P( A, B, C, D, 4, 6, 0xF7537E82 ); P( D, A, B, C, 11, 10, 0xBD3AF235 ); P( C, D, A, B, 2, 15, 0x2AD7D2BB ); P( B, C, D, A, 9, 21, 0xEB86D391 ); #undef F ctx->state[0] += A; ctx->state[1] += B; ctx->state[2] += C; ctx->state[3] += D; } static void md5_update( md5_context *ctx, uint8 *input, uint32 length ) { uint32 left, fill; if( !length ) return; left = ctx->total[0] & 0x3F; fill = 64 - left; ctx->total[0] += length; ctx->total[0] &= 0xFFFFFFFF; if( ctx->total[0] < length ) ctx->total[1]++; if( left && length >= fill ) { memcpy( (void *) (ctx->buffer + left), (void *) input, fill ); md5_process( ctx, ctx->buffer ); length -= fill; input += fill; left = 0; } while( length >= 64 ) { md5_process( ctx, input ); length -= 64; input += 64; } if( length ) { memcpy( (void *) (ctx->buffer + left), (void *) input, length ); } } static uint8 md5_padding[64] = { 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_finish( md5_context *ctx, uint8 digest[16] ) { uint32 last, padn; uint32 high, low; uint8 msglen[8]; high = ( ctx->total[0] >> 29 ) | ( ctx->total[1] << 3 ); low = ( ctx->total[0] << 3 ); PUT_UINT32( low, msglen, 0 ); PUT_UINT32( high, msglen, 4 ); last = ctx->total[0] & 0x3F; padn = ( last < 56 ) ? ( 56 - last ) : ( 120 - last ); md5_update( ctx, md5_padding, padn ); md5_update( ctx, msglen, 8 ); PUT_UINT32( ctx->state[0], digest, 0 ); PUT_UINT32( ctx->state[1], digest, 4 ); PUT_UINT32( ctx->state[2], digest, 8 ); PUT_UINT32( ctx->state[3], digest, 12 ); } static void md5_uint( md5_context *m, uint32 i ) { md5_update(m,(unsigned char*)&i,4); } typedef struct stack { uint32 pos; value v; md5_context *m; struct stack *next; } stack; // build some integers that are not neko ones (last bit at 0) // this reduce the possible collisions. // bit 0 = 0 // bit 1-2 = // 00 : const (null, true, false, abstract) // 01 : ref // 10 : fun // 11 : array // // md5-similar objects can still be forged, in particular // due to the fact that no special flag is added to the string // digest in order to keep compatibility with standard md5 // implementation. // // For example md5(null) == md5("\000\000\000\000") static void make_md5_fields( value v, field f, void * ); static void make_md5_rec( md5_context *m, value v, stack *cur ) { switch( val_type(v) ) { case VAL_NULL: md5_uint(m,0); break; case VAL_INT: md5_uint(m,(uint32)(int_val)v); break; case VAL_BOOL: md5_uint(m,val_bool(v)?8:16); break; case VAL_FLOAT: { tfloat f = val_float(v); md5_update(m,(unsigned char *)&f,sizeof(tfloat)); } break; case VAL_STRING: md5_update(m,(uint8*)val_string(v),(uint32)val_strlen(v)); break; case VAL_OBJECT: case VAL_ARRAY: { stack loc; stack *s = cur; while( s != NULL ) { if( s->v == v ) { md5_uint(m,(s->pos << 3) | 2); return; } s = s->next; } loc.v = v; loc.pos = cur?(cur->pos+1):0; loc.next = cur; loc.m = m; if( val_is_object(v) ) { val_iter_fields(v,make_md5_fields,&loc); v = (value)((vobject*)v)->proto; if( v != NULL ) make_md5_rec(m,v,&loc); } else { int len = val_array_size(v); md5_uint(m,(len << 3) | 6); while( len-- > 0 ) make_md5_rec(m,val_array_ptr(v)[len],&loc); } } break; case VAL_FUNCTION: md5_uint(m,(val_fun_nargs(v) << 3) | 4); break; case VAL_ABSTRACT: md5_uint(m,24); break; } } static void make_md5_fields( value v, field f, void *c ) { stack *s = (stack*)c; md5_uint(s->m,f); make_md5_rec(s->m,v,s); } /** make_md5 : any -> string Build a MD5 digest (16 bytes binary string) from any value. **/ static value make_md5( value v ) { value out = alloc_empty_string(16); md5_context m; md5_starts(&m); make_md5_rec(&m,v,NULL); md5_finish(&m,(uint8 *)val_string(out)); return out; } DEFINE_PRIM(make_md5,1); /* ************************************************************************ */