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1.1 |
#include "EXTERN.h" |
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#include "perl.h" |
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#include "XSUB.h" |
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#include <time.h> |
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#include <stdlib.h> |
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#include <stdint.h> |
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/* NIST Secure Hash Algorithm */ |
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/* heavily modified by Uwe Hollerbach <uh@alumni.caltech edu> */ |
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/* from Peter C. Gutmann's implementation as found in */ |
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/* Applied Cryptography by Bruce Schneier */ |
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/* Further modifications to include the "UNRAVEL" stuff, below */ |
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/* This code is in the public domain */ |
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/* pcg: I was tempted to just rip this code off, after all, if you don't |
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* demand anything I am inclined not to give anything. *Sigh* something |
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* kept me from doing it, so here's the truth: I took this code from the |
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* SHA1 perl module, since it looked reasonably well-crafted. I modified |
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* it here and there, though. |
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*/ |
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1.5 |
/* |
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* we have lots of micro-optimizations here, this is just for toying |
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* around... |
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*/ |
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1.1 |
/* don't expect _too_ much from compilers for now. */ |
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1.2 |
#if __GNUC__ > 2 |
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1.1 |
# define restrict __restrict__ |
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1.2 |
# define inline __inline__ |
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# ifdef __i386 |
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# define GCCX86ASM 1 |
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# endif |
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1.1 |
#elif __STDC_VERSION__ < 199900 |
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# define restrict |
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1.2 |
# define inline |
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1.1 |
#endif |
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1.5 |
#if __GNUC__ < 2 |
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# define __attribute__(x) |
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#endif |
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#ifdef __i386 |
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# define a_regparm(n) __attribute__((__regparm__(n))) |
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#else |
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# define a_regparm(n) |
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#endif |
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#define a_const __attribute__((__const__)) |
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1.1 |
/* Useful defines & typedefs */ |
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#if defined(U64TYPE) && (defined(USE_64_BIT_INT) || ((BYTEORDER != 0x1234) && (BYTEORDER != 0x4321))) |
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typedef U64TYPE ULONG; |
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1.4 |
# if BYTEORDER == 0x1234 |
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# undef BYTEORDER |
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# define BYTEORDER 0x12345678 |
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# elif BYTEORDER == 0x4321 |
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# undef BYTEORDER |
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# define BYTEORDER 0x87654321 |
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# endif |
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1.1 |
#else |
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typedef uint_fast32_t ULONG; /* 32-or-more-bit quantity */ |
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#endif |
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1.2 |
#if GCCX86ASM |
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# define zprefix(n) ({ int _r; __asm__ ("bsrl %1, %0" : "=r" (_r) : "r" (n)); 31 - _r ; }) |
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1.4 |
#elif __GNUC__ > 2 && __GNUC_MINOR__ > 3 |
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# define zprefix(n) (__extension__ ({ uint32_t n__ = (n); n ? __builtin_clz (n) : 32; })) |
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1.2 |
#else |
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1.5 |
static int a_const zprefix (ULONG n) |
74 |
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1.2 |
{ |
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static char zp[256] = |
76 |
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{ |
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8, 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, |
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3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, |
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2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, |
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2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, |
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
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}; |
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return |
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n > 0xffffff ? zp[n >> 24] |
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: n > 0xffff ? 8 + zp[n >> 16] |
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: n > 0xff ? 16 + zp[n >> 8] |
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: 24 + zp[n]; |
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} |
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#endif |
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1.1 |
#define SHA_BLOCKSIZE 64 |
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#define SHA_DIGESTSIZE 20 |
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typedef struct { |
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ULONG digest[5]; /* message digest */ |
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ULONG count; /* 32-bit bit count */ |
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1.2 |
int local; /* unprocessed amount in data */ |
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1.1 |
U8 data[SHA_BLOCKSIZE]; /* SHA data buffer */ |
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} SHA_INFO; |
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/* SHA f()-functions */ |
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#define f1(x,y,z) ((x & y) | (~x & z)) |
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#define f2(x,y,z) (x ^ y ^ z) |
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#define f3(x,y,z) ((x & y) | (x & z) | (y & z)) |
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#define f4(x,y,z) (x ^ y ^ z) |
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120 |
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/* SHA constants */ |
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#define CONST1 0x5a827999L |
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#define CONST2 0x6ed9eba1L |
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#define CONST3 0x8f1bbcdcL |
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#define CONST4 0xca62c1d6L |
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126 |
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/* truncate to 32 bits -- should be a null op on 32-bit machines */ |
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#define T32(x) ((x) & 0xffffffffL) |
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/* 32-bit rotate */ |
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#define R32(x,n) T32(((x << n) | (x >> (32 - n)))) |
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132 |
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/* specific cases, for when the overall rotation is unraveled */ |
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#define FA(n) \ |
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T = T32(R32(A,5) + f##n(B,C,D) + E + *WP++ + CONST##n); B = R32(B,30) |
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#define FB(n) \ |
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E = T32(R32(T,5) + f##n(A,B,C) + D + *WP++ + CONST##n); A = R32(A,30) |
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139 |
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#define FC(n) \ |
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D = T32(R32(E,5) + f##n(T,A,B) + C + *WP++ + CONST##n); T = R32(T,30) |
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#define FD(n) \ |
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C = T32(R32(D,5) + f##n(E,T,A) + B + *WP++ + CONST##n); E = R32(E,30) |
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#define FE(n) \ |
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B = T32(R32(C,5) + f##n(D,E,T) + A + *WP++ + CONST##n); D = R32(D,30) |
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#define FT(n) \ |
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A = T32(R32(B,5) + f##n(C,D,E) + T + *WP++ + CONST##n); C = R32(C,30) |
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151 |
root |
1.5 |
static void a_regparm(1) sha_transform(SHA_INFO *restrict sha_info) |
152 |
root |
1.1 |
{ |
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int i; |
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1.5 |
U8 *restrict dp; |
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root |
1.2 |
ULONG T, A, B, C, D, E, W[80], *restrict WP; |
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1.1 |
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dp = sha_info->data; |
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#if BYTEORDER == 0x1234 |
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assert(sizeof(ULONG) == 4); |
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1.2 |
# ifdef HAS_NTOHL |
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for (i = 0; i < 16; ++i) { |
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T = *((ULONG *) dp); |
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dp += 4; |
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W[i] = ntohl (T); |
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} |
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# else |
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root |
1.1 |
for (i = 0; i < 16; ++i) { |
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T = *((ULONG *) dp); |
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dp += 4; |
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W[i] = ((T << 24) & 0xff000000) | ((T << 8) & 0x00ff0000) | |
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((T >> 8) & 0x0000ff00) | ((T >> 24) & 0x000000ff); |
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} |
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root |
1.2 |
# endif |
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#elif BYTEORDER == 0x4321 |
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root |
1.1 |
assert(sizeof(ULONG) == 4); |
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for (i = 0; i < 16; ++i) { |
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T = *((ULONG *) dp); |
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dp += 4; |
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W[i] = T32(T); |
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} |
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1.2 |
#elif BYTEORDER == 0x12345678 |
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1.1 |
assert(sizeof(ULONG) == 8); |
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for (i = 0; i < 16; i += 2) { |
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T = *((ULONG *) dp); |
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dp += 8; |
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W[i] = ((T << 24) & 0xff000000) | ((T << 8) & 0x00ff0000) | |
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((T >> 8) & 0x0000ff00) | ((T >> 24) & 0x000000ff); |
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T >>= 32; |
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W[i+1] = ((T << 24) & 0xff000000) | ((T << 8) & 0x00ff0000) | |
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((T >> 8) & 0x0000ff00) | ((T >> 24) & 0x000000ff); |
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} |
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root |
1.2 |
#elif BYTEORDER == 0x87654321 |
194 |
root |
1.1 |
assert(sizeof(ULONG) == 8); |
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for (i = 0; i < 16; i += 2) { |
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T = *((ULONG *) dp); |
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dp += 8; |
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W[i] = T32(T >> 32); |
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W[i+1] = T32(T); |
200 |
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} |
201 |
root |
1.2 |
#else |
202 |
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#error Unknown byte order -- you need to add code here |
203 |
root |
1.1 |
#endif |
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root |
1.2 |
for (i = 16; i < 80; ++i) |
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{ |
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T = W[i-3] ^ W[i-8] ^ W[i-14] ^ W[i-16]; |
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W[i] = R32(T,1); |
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} |
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root |
1.1 |
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A = sha_info->digest[0]; |
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B = sha_info->digest[1]; |
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C = sha_info->digest[2]; |
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D = sha_info->digest[3]; |
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E = sha_info->digest[4]; |
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root |
1.2 |
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217 |
root |
1.1 |
WP = W; |
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FA(1); FB(1); FC(1); FD(1); FE(1); FT(1); FA(1); FB(1); FC(1); FD(1); |
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FE(1); FT(1); FA(1); FB(1); FC(1); FD(1); FE(1); FT(1); FA(1); FB(1); |
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FC(2); FD(2); FE(2); FT(2); FA(2); FB(2); FC(2); FD(2); FE(2); FT(2); |
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FA(2); FB(2); FC(2); FD(2); FE(2); FT(2); FA(2); FB(2); FC(2); FD(2); |
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FE(3); FT(3); FA(3); FB(3); FC(3); FD(3); FE(3); FT(3); FA(3); FB(3); |
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FC(3); FD(3); FE(3); FT(3); FA(3); FB(3); FC(3); FD(3); FE(3); FT(3); |
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FA(4); FB(4); FC(4); FD(4); FE(4); FT(4); FA(4); FB(4); FC(4); FD(4); |
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FE(4); FT(4); FA(4); FB(4); FC(4); FD(4); FE(4); FT(4); FA(4); FB(4); |
226 |
root |
1.2 |
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227 |
root |
1.1 |
sha_info->digest[0] = T32(sha_info->digest[0] + E); |
228 |
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sha_info->digest[1] = T32(sha_info->digest[1] + T); |
229 |
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sha_info->digest[2] = T32(sha_info->digest[2] + A); |
230 |
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sha_info->digest[3] = T32(sha_info->digest[3] + B); |
231 |
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sha_info->digest[4] = T32(sha_info->digest[4] + C); |
232 |
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} |
233 |
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234 |
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/* initialize the SHA digest */ |
235 |
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236 |
root |
1.2 |
static void sha_init(SHA_INFO *restrict sha_info) |
237 |
root |
1.1 |
{ |
238 |
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sha_info->digest[0] = 0x67452301L; |
239 |
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sha_info->digest[1] = 0xefcdab89L; |
240 |
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sha_info->digest[2] = 0x98badcfeL; |
241 |
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sha_info->digest[3] = 0x10325476L; |
242 |
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sha_info->digest[4] = 0xc3d2e1f0L; |
243 |
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sha_info->count = 0L; |
244 |
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sha_info->local = 0; |
245 |
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} |
246 |
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247 |
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/* update the SHA digest */ |
248 |
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249 |
root |
1.2 |
static void sha_update(SHA_INFO *restrict sha_info, U8 *restrict buffer, int count) |
250 |
root |
1.1 |
{ |
251 |
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int i; |
252 |
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253 |
root |
1.2 |
sha_info->count += count; |
254 |
root |
1.1 |
if (sha_info->local) { |
255 |
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i = SHA_BLOCKSIZE - sha_info->local; |
256 |
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if (i > count) { |
257 |
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i = count; |
258 |
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} |
259 |
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memcpy(((U8 *) sha_info->data) + sha_info->local, buffer, i); |
260 |
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count -= i; |
261 |
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buffer += i; |
262 |
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sha_info->local += i; |
263 |
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if (sha_info->local == SHA_BLOCKSIZE) { |
264 |
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sha_transform(sha_info); |
265 |
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} else { |
266 |
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return; |
267 |
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} |
268 |
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} |
269 |
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while (count >= SHA_BLOCKSIZE) { |
270 |
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memcpy(sha_info->data, buffer, SHA_BLOCKSIZE); |
271 |
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buffer += SHA_BLOCKSIZE; |
272 |
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count -= SHA_BLOCKSIZE; |
273 |
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sha_transform(sha_info); |
274 |
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} |
275 |
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memcpy(sha_info->data, buffer, count); |
276 |
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sha_info->local = count; |
277 |
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} |
278 |
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279 |
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/* finish computing the SHA digest */ |
280 |
root |
1.2 |
static int sha_final(SHA_INFO *sha_info) |
281 |
root |
1.1 |
{ |
282 |
root |
1.2 |
int count = sha_info->count; |
283 |
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int local = sha_info->local; |
284 |
root |
1.1 |
|
285 |
root |
1.2 |
sha_info->data[local] = 0x80; |
286 |
root |
1.1 |
|
287 |
root |
1.2 |
if (sha_info->local >= SHA_BLOCKSIZE - 8) { |
288 |
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memset(sha_info->data + local + 1, 0, SHA_BLOCKSIZE - 1 - local); |
289 |
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sha_transform(sha_info); |
290 |
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memset(sha_info->data, 0, SHA_BLOCKSIZE - 2); |
291 |
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} else { |
292 |
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memset(sha_info->data + local + 1, 0, SHA_BLOCKSIZE - 3 - local); |
293 |
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} |
294 |
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295 |
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sha_info->data[62] = count >> 5; |
296 |
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sha_info->data[63] = count << 3; |
297 |
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298 |
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sha_transform (sha_info); |
299 |
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300 |
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return sha_info->digest[0] |
301 |
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? zprefix (sha_info->digest[0]) |
302 |
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: zprefix (sha_info->digest[1]) + 32; |
303 |
root |
1.1 |
} |
304 |
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305 |
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#define TRIALCHAR "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!#$%&()*+,-./;<=>?@[]{}^_|" |
306 |
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307 |
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static char nextenc[256]; |
308 |
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309 |
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static char rand_char () |
310 |
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{ |
311 |
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return TRIALCHAR[rand () % sizeof (TRIALCHAR)]; |
312 |
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} |
313 |
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314 |
root |
1.2 |
typedef double (*NVTime)(void); |
315 |
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316 |
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static double simple_nvtime (void) |
317 |
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{ |
318 |
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return time (0); |
319 |
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} |
320 |
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321 |
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static NVTime get_nvtime (void) |
322 |
root |
1.1 |
{ |
323 |
root |
1.2 |
SV **svp = hv_fetch (PL_modglobal, "Time::NVtime", 12, 0); |
324 |
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325 |
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if (svp && SvIOK(*svp)) |
326 |
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return INT2PTR(NVTime, SvIV(*svp)); |
327 |
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else |
328 |
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return simple_nvtime; |
329 |
root |
1.1 |
|
330 |
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} |
331 |
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332 |
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MODULE = Digest::Hashcash PACKAGE = Digest::Hashcash |
333 |
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|
334 |
|
|
BOOT: |
335 |
|
|
{ |
336 |
|
|
int i; |
337 |
|
|
|
338 |
|
|
for (i = 0; i < sizeof (TRIALCHAR); i++) |
339 |
|
|
nextenc[TRIALCHAR[i]] = TRIALCHAR[(i + 1) % sizeof (TRIALCHAR)]; |
340 |
|
|
} |
341 |
|
|
|
342 |
|
|
PROTOTYPES: ENABLE |
343 |
|
|
|
344 |
root |
1.2 |
# could be improved quite a bit in accuracy |
345 |
|
|
NV |
346 |
|
|
_estimate_rounds () |
347 |
root |
1.1 |
CODE: |
348 |
root |
1.3 |
{ |
349 |
root |
1.2 |
char data[40]; |
350 |
|
|
NVTime nvtime = get_nvtime (); |
351 |
|
|
NV t1, t2, t; |
352 |
|
|
int count = 0; |
353 |
|
|
SHA_INFO ctx; |
354 |
|
|
|
355 |
|
|
t = nvtime (); |
356 |
|
|
do { |
357 |
|
|
t1 = nvtime (); |
358 |
|
|
} while (t == t1); |
359 |
|
|
|
360 |
|
|
t = t2 = nvtime (); |
361 |
|
|
do { |
362 |
|
|
volatile int i; |
363 |
|
|
sha_init (&ctx); |
364 |
|
|
sha_update (&ctx, data, sizeof (data)); |
365 |
|
|
i = sha_final (&ctx); |
366 |
|
|
|
367 |
|
|
if (!(++count & 1023)) |
368 |
|
|
t2 = nvtime (); |
369 |
|
|
|
370 |
|
|
} while (t == t2); |
371 |
|
|
|
372 |
|
|
RETVAL = (NV)count / (t2 - t1); |
373 |
root |
1.3 |
} |
374 |
root |
1.1 |
OUTPUT: |
375 |
|
|
RETVAL |
376 |
|
|
|
377 |
|
|
SV * |
378 |
root |
1.2 |
_gentoken (int size, IV timestamp, char *resource, char *trial = "", int extrarand = 0) |
379 |
root |
1.1 |
CODE: |
380 |
root |
1.3 |
{ |
381 |
root |
1.1 |
SHA_INFO ctx1, ctx; |
382 |
|
|
char *token, *seq, *s; |
383 |
|
|
int toklen, i; |
384 |
|
|
time_t tstamp = timestamp ? timestamp : time (0); |
385 |
|
|
struct tm *tm = gmtime (&tstamp); |
386 |
|
|
|
387 |
|
|
New (0, token, |
388 |
root |
1.6 |
1 + 1 // version |
389 |
|
|
+ 12 + 1 // time field sans century |
390 |
|
|
+ strlen (resource) + 1 // ressource |
391 |
|
|
+ strlen (trial) + extrarand + 8 + 1 // trial |
392 |
|
|
+ 1, |
393 |
|
|
char); |
394 |
root |
1.1 |
|
395 |
|
|
if (!token) |
396 |
|
|
croak ("out of memory"); |
397 |
|
|
|
398 |
root |
1.2 |
if (size > 64) |
399 |
|
|
croak ("size must be <= 64 in this implementation\n"); |
400 |
root |
1.1 |
|
401 |
|
|
toklen = sprintf (token, "%d:%02d%02d%02d%02d%02d%02d:%s:%s", |
402 |
|
|
0, tm->tm_year % 100, tm->tm_mon + 1, tm->tm_mday, |
403 |
|
|
tm->tm_hour, tm->tm_min, tm->tm_sec, |
404 |
|
|
resource, trial); |
405 |
|
|
|
406 |
root |
1.2 |
if (toklen > 8000) |
407 |
|
|
croak ("token length must be <= 8000 in this implementation\n"); |
408 |
|
|
|
409 |
root |
1.1 |
i = toklen + extrarand; |
410 |
|
|
while (toklen < i) |
411 |
|
|
token[toklen++] = rand_char (); |
412 |
|
|
|
413 |
|
|
sha_init (&ctx1); |
414 |
|
|
sha_update (&ctx1, token, toklen); |
415 |
|
|
|
416 |
|
|
seq = token + toklen; |
417 |
|
|
i += 8; |
418 |
|
|
while (toklen < i) |
419 |
|
|
token[toklen++] = rand_char (); |
420 |
|
|
|
421 |
|
|
for (;;) |
422 |
|
|
{ |
423 |
|
|
ctx = ctx1; // this "optimization" can help a lot for longer resource strings |
424 |
|
|
sha_update (&ctx, seq, 8); |
425 |
root |
1.2 |
i = sha_final (&ctx); |
426 |
root |
1.1 |
|
427 |
root |
1.2 |
if (i >= size) |
428 |
root |
1.1 |
break; |
429 |
|
|
|
430 |
|
|
s = seq; |
431 |
|
|
do { |
432 |
|
|
*s = nextenc [*s]; |
433 |
|
|
} while (*s++ == 'a'); |
434 |
|
|
} |
435 |
|
|
|
436 |
|
|
RETVAL = newSVpvn (token, toklen); |
437 |
root |
1.3 |
} |
438 |
root |
1.1 |
OUTPUT: |
439 |
|
|
RETVAL |
440 |
|
|
|
441 |
|
|
int |
442 |
|
|
_prefixlen (SV *tok) |
443 |
|
|
CODE: |
444 |
root |
1.3 |
{ |
445 |
root |
1.1 |
STRLEN toklen; |
446 |
|
|
char *token = SvPV (tok, toklen); |
447 |
|
|
SHA_INFO ctx; |
448 |
|
|
|
449 |
|
|
sha_init (&ctx); |
450 |
|
|
sha_update (&ctx, token, toklen); |
451 |
root |
1.2 |
RETVAL = sha_final (&ctx); |
452 |
root |
1.3 |
} |
453 |
root |
1.1 |
OUTPUT: |
454 |
|
|
RETVAL |
455 |
|
|
|
456 |
|
|
|