start of openssl interface: copy gmp interface to openssl interface

diff --git a/d0_bignum-openssl.c b/d0_bignum-openssl.c
new file mode 100644 (file)
index 0000000..1567d42
--- /dev/null
+++ b/d0_bignum-openssl.c
@@ -0,0 +1,383 @@
+/*
+Blind-ID library for user identification using RSA blind signatures
+Copyright (C) 2010  Rudolf Polzer
+
+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 for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this library; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#ifdef WIN32
+#include <windows.h>
+#include <wincrypt.h>
+#endif
+
+#include "d0_bignum.h"
+
+#include <gmp.h>
+#include <string.h>
+#include <stdlib.h>
+
+struct d0_bignum_s
+{
+       mpz_t z;
+};
+
+static gmp_randstate_t RANDSTATE;
+static d0_bignum_t temp;
+
+#include <time.h>
+#include <stdio.h>
+
+WARN_UNUSED_RESULT BOOL d0_bignum_INITIALIZE(void)
+{
+       FILE *f;
+       BOOL ret = 1;
+       unsigned char buf[256];
+       d0_bignum_init(&temp);
+       gmp_randinit_mt(RANDSTATE);
+       gmp_randseed_ui(RANDSTATE, time(NULL));
+       * (time_t *) (&buf[0]) = time(0); // if everything else fails, we use the current time + uninitialized data
+#ifdef WIN32
+       {
+               HCRYPTPROV hCryptProv;
+               if(CryptAcquireContext(&hCryptProv, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT))
+               {
+                       if(!CryptGenRandom(hCryptProv, sizeof(buf), (PBYTE) &buf[0]))
+                       {
+                               fprintf(stderr, "WARNING: could not initialize random number generator (CryptGenRandom failed)\n");
+                               ret = 0;
+                       }
+                       CryptReleaseContext(hCryptProv, 0);
+               }
+               else if(CryptAcquireContext(&hCryptProv, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT | CRYPT_NEWKEYSET))
+               {
+                       if(!CryptGenRandom(hCryptProv, sizeof(buf), (PBYTE) &buf[0]))
+                       {
+                               fprintf(stderr, "WARNING: could not initialize random number generator (CryptGenRandom failed)\n");
+                               ret = 0;
+                       }
+                       CryptReleaseContext(hCryptProv, 0);
+               }
+               else
+               {
+                       fprintf(stderr, "WARNING: could not initialize random number generator (CryptAcquireContext failed)\n");
+                       ret = 0;
+               }
+       }
+#else
+       f = fopen("/dev/urandom", "rb");
+       if(!f)
+               f = fopen("/dev/random", "rb");
+       if(f)
+       {
+               setbuf(f, NULL);
+               if(fread(buf, sizeof(buf), 1, f) != 1)
+               {
+                       fprintf(stderr, "WARNING: could not initialize random number generator (read from random device failed)\n");
+                       ret = 0;
+               }
+               fclose(f);
+       }
+       else
+       {
+               fprintf(stderr, "WARNING: could not initialize random number generator (no random device found)\n");
+               ret = 0;
+       }
+#endif
+
+       mpz_import(temp.z, sizeof(buf), 1, 1, 0, 0, buf);
+       gmp_randseed(RANDSTATE, temp.z);
+
+       return ret;
+}
+
+void d0_bignum_SHUTDOWN(void)
+{
+       d0_bignum_clear(&temp);
+       gmp_randclear(RANDSTATE);
+}
+
+BOOL d0_iobuf_write_bignum(d0_iobuf_t *buf, const d0_bignum_t *bignum)
+{
+       static unsigned char numbuf[65536];
+       size_t count = 0;
+       numbuf[0] = mpz_sgn(bignum->z) & 3;
+       if((numbuf[0] & 3) != 0) // nonzero
+       {
+               count = (mpz_sizeinbase(bignum->z, 2) + 7) / 8;
+               if(count > sizeof(numbuf) - 1)
+                       return 0;
+               mpz_export(numbuf+1, &count, 1, 1, 0, 0, bignum->z);
+       }
+       return d0_iobuf_write_packet(buf, numbuf, count + 1);
+}
+
+d0_bignum_t *d0_iobuf_read_bignum(d0_iobuf_t *buf, d0_bignum_t *bignum)
+{
+       static unsigned char numbuf[65536];
+       size_t count = sizeof(numbuf);
+       if(!d0_iobuf_read_packet(buf, numbuf, &count))
+               return NULL;
+       if(count < 1)
+               return NULL;
+       if(!bignum) bignum = d0_bignum_new(); if(!bignum) return NULL;
+       if(numbuf[0] & 3) // nonzero
+       {
+               mpz_import(bignum->z, count-1, 1, 1, 0, 0, numbuf+1);
+               if(numbuf[0] & 2) // negative
+                       mpz_neg(bignum->z, bignum->z);
+       }
+       else // zero
+       {
+               mpz_set_ui(bignum->z, 0);
+       }
+       return bignum;
+}
+
+ssize_t d0_bignum_export_unsigned(const d0_bignum_t *bignum, void *buf, size_t bufsize)
+{
+       size_t count;
+       count = (mpz_sizeinbase(bignum->z, 2) + 7) / 8;
+       if(count > bufsize)
+               return -1;
+       if(bufsize > count)
+       {
+               // pad from left (big endian numbers!)
+               memset(buf, 0, bufsize - count);
+               buf += bufsize - count;
+       }
+       bufsize = count;
+       mpz_export(buf, &bufsize, 1, 1, 0, 0, bignum->z);
+       if(bufsize > count)
+       {
+               // REALLY BAD
+               // mpz_sizeinbase lied to us
+               // buffer overflow
+               // there is no sane way whatsoever to handle this
+               abort();
+       }
+       if(bufsize < count)
+       {
+               // BAD
+               // mpz_sizeinbase lied to us
+               // move the number
+               if(bufsize == 0)
+               {
+                       memset(buf, 0, count);
+               }
+               else
+               {
+                       memmove(buf + count - bufsize, buf, bufsize);
+                       memset(buf, 0, count - bufsize);
+               }
+       }
+       return bufsize;
+}
+
+d0_bignum_t *d0_bignum_import_unsigned(d0_bignum_t *bignum, const void *buf, size_t bufsize)
+{
+       size_t count;
+       if(!bignum) bignum = d0_bignum_new(); if(!bignum) return NULL;
+       mpz_import(bignum->z, bufsize, 1, 1, 0, 0, buf);
+       return bignum;
+}
+
+d0_bignum_t *d0_bignum_new(void)
+{
+       d0_bignum_t *b = d0_malloc(sizeof(d0_bignum_t));
+       mpz_init(b->z);
+       return b;
+}
+
+void d0_bignum_free(d0_bignum_t *a)
+{
+       mpz_clear(a->z);
+       d0_free(a);
+}
+
+void d0_bignum_init(d0_bignum_t *b)
+{
+       mpz_init(b->z);
+}
+
+void d0_bignum_clear(d0_bignum_t *a)
+{
+       mpz_clear(a->z);
+}
+
+size_t d0_bignum_size(const d0_bignum_t *r)
+{
+       return mpz_sizeinbase(r->z, 2);
+}
+
+int d0_bignum_cmp(const d0_bignum_t *a, const d0_bignum_t *b)
+{
+       return mpz_cmp(a->z, b->z);
+}
+
+d0_bignum_t *d0_bignum_rand_range(d0_bignum_t *r, const d0_bignum_t *min, const d0_bignum_t *max)
+{
+       if(!r) r = d0_bignum_new(); if(!r) return NULL;
+       mpz_sub(temp.z, max->z, min->z);
+       mpz_urandomm(r->z, RANDSTATE, temp.z);
+       mpz_add(r->z, r->z, min->z);
+       return r;
+}
+
+d0_bignum_t *d0_bignum_rand_bit_atmost(d0_bignum_t *r, size_t n)
+{
+       if(!r) r = d0_bignum_new(); if(!r) return NULL;
+       mpz_urandomb(r->z, RANDSTATE, n);
+       return r;
+}
+
+d0_bignum_t *d0_bignum_rand_bit_exact(d0_bignum_t *r, size_t n)
+{
+       if(!r) r = d0_bignum_new(); if(!r) return NULL;
+       mpz_urandomb(r->z, RANDSTATE, n-1);
+       mpz_setbit(r->z, n-1);
+       return r;
+}
+
+d0_bignum_t *d0_bignum_zero(d0_bignum_t *r)
+{
+       return d0_bignum_int(r, 0);
+}
+
+d0_bignum_t *d0_bignum_one(d0_bignum_t *r)
+{
+       return d0_bignum_int(r, 1);
+}
+
+d0_bignum_t *d0_bignum_int(d0_bignum_t *r, int n)
+{
+       if(!r) r = d0_bignum_new(); if(!r) return NULL;
+       mpz_set_si(r->z, n);
+       return r;
+}
+
+d0_bignum_t *d0_bignum_mov(d0_bignum_t *r, const d0_bignum_t *a)
+{
+       if(r == a)
+               return r; // trivial
+       if(!r) r = d0_bignum_new(); if(!r) return NULL;
+       mpz_set(r->z, a->z);
+       return r;
+}
+
+d0_bignum_t *d0_bignum_neg(d0_bignum_t *r, const d0_bignum_t *a)
+{
+       if(!r) r = d0_bignum_new(); if(!r) return NULL;
+       mpz_neg(r->z, a->z);
+       return r;
+}
+
+d0_bignum_t *d0_bignum_shl(d0_bignum_t *r, const d0_bignum_t *a, ssize_t n)
+{
+       if(!r) r = d0_bignum_new(); if(!r) return NULL;
+       if(n > 0)
+               mpz_mul_2exp(r->z, a->z, n);
+       else if(n < 0)
+               mpz_fdiv_q_2exp(r->z, a->z, -n);
+       else
+               mpz_set(r->z, a->z);
+       return r;
+}
+
+d0_bignum_t *d0_bignum_add(d0_bignum_t *r, const d0_bignum_t *a, const d0_bignum_t *b)
+{
+       if(!r) r = d0_bignum_new(); if(!r) return NULL;
+       mpz_add(r->z, a->z, b->z);
+       return r;
+}
+
+d0_bignum_t *d0_bignum_sub(d0_bignum_t *r, const d0_bignum_t *a, const d0_bignum_t *b)
+{
+       if(!r) r = d0_bignum_new(); if(!r) return NULL;
+       mpz_sub(r->z, a->z, b->z);
+       return r;
+}
+
+d0_bignum_t *d0_bignum_mul(d0_bignum_t *r, const d0_bignum_t *a, const d0_bignum_t *b)
+{
+       if(!r) r = d0_bignum_new(); if(!r) return NULL;
+       mpz_mul(r->z, a->z, b->z);
+       return r;
+}
+
+d0_bignum_t *d0_bignum_divmod(d0_bignum_t *q, d0_bignum_t *m, const d0_bignum_t *a, const d0_bignum_t *b)
+{
+       if(!q && !m)
+               m = d0_bignum_new();
+       if(q)
+               if(m)
+                       mpz_fdiv_qr(q->z, m->z, a->z, b->z);
+               else
+                       mpz_fdiv_q(q->z, a->z, b->z);
+       else
+               mpz_fdiv_r(m->z, a->z, b->z);
+       if(m)
+               return m;
+       else
+               return q;
+}
+
+d0_bignum_t *d0_bignum_mod_add(d0_bignum_t *r, const d0_bignum_t *a, const d0_bignum_t *b, const d0_bignum_t *m)
+{
+       r = d0_bignum_add(r, a, b);
+       mpz_fdiv_r(r->z, r->z, m->z);
+       return r;
+}
+
+d0_bignum_t *d0_bignum_mod_mul(d0_bignum_t *r, const d0_bignum_t *a, const d0_bignum_t *b, const d0_bignum_t *m)
+{
+       r = d0_bignum_mul(r, a, b);
+       mpz_fdiv_r(r->z, r->z, m->z);
+       return r;
+}
+
+d0_bignum_t *d0_bignum_mod_pow(d0_bignum_t *r, const d0_bignum_t *a, const d0_bignum_t *b, const d0_bignum_t *m)
+{
+       if(!r) r = d0_bignum_new(); if(!r) return NULL;
+       mpz_powm(r->z, a->z, b->z, m->z);
+       return r;
+}
+
+BOOL d0_bignum_mod_inv(d0_bignum_t *r, const d0_bignum_t *a, const d0_bignum_t *m)
+{
+       // here, r MUST be set, as otherwise we cannot return error state!
+       return mpz_invert(r->z, a->z, m->z);
+}
+
+int d0_bignum_isprime(d0_bignum_t *r, int param)
+{
+       return mpz_probab_prime_p(r->z, param);
+}
+
+d0_bignum_t *d0_bignum_gcd(d0_bignum_t *r, d0_bignum_t *s, d0_bignum_t *t, const d0_bignum_t *a, const d0_bignum_t *b)
+{
+       if(!r) r = d0_bignum_new(); if(!r) return NULL;
+       if(s)
+               mpz_gcdext(r->z, s->z, t ? t->z : NULL, a->z, b->z);
+       else if(t)
+               mpz_gcdext(r->z, t->z, NULL, b->z, a->z);
+       else
+               mpz_gcd(r->z, a->z, b->z);
+       return r;
+}
+
+char *d0_bignum_tostring(const d0_bignum_t *x, unsigned int base)
+{
+       return mpz_get_str(NULL, base, x->z);
+}