1 files changed, 209 insertions, 184 deletions

diff --git a/src/lib/libcrypto/bn/bn_prime.c b/src/lib/libcrypto/bn/bn_prime.c
index 7b25979dd1..7d4cab4acd 100644
--- a/src/lib/libcrypto/bn/bn_prime.c
+++ b/src/lib/libcrypto/bn/bn_prime.c
@@ -5,21 +5,21 @@
  * This package is an SSL implementation written
  * by Eric Young (eay@cryptsoft.com).
  * The implementation was written so as to conform with Netscapes SSL.
- * 
+ *
  * This library is free for commercial and non-commercial use as long as
  * the following conditions are aheared to.  The following conditions
  * apply to all code found in this distribution, be it the RC4, RSA,
  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  * included with this distribution is covered by the same copyright terms
  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
- * 
+ *
  * Copyright remains Eric Young's, and as such any Copyright notices in
  * the code are not to be removed.
  * If this package is used in a product, Eric Young should be given attribution
  * as the author of the parts of the library used.
  * This can be in the form of a textual message at program startup or
  * in documentation (online or textual) provided with the package.
- * 
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
@@ -34,10 +34,10 @@
  *     Eric Young (eay@cryptsoft.com)"
  *    The word 'cryptographic' can be left out if the rouines from the library
  *    being used are not cryptographic related :-).
- * 4. If you include any Windows specific code (or a derivative thereof) from 
+ * 4. If you include any Windows specific code (or a derivative thereof) from
  *    the apps directory (application code) you must include an acknowledgement:
  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
- * 
+ *
  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
@@ -49,7 +49,7 @@
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
- * 
+ *
  * The licence and distribution terms for any publically available version or
  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  * copied and put under another distribution licence
@@ -63,7 +63,7 @@
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer. 
+ *    notice, this list of conditions and the following disclaimer.
  *
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in
@@ -127,22 +127,23 @@
 #include "bn_prime.h"
 
 static int witness(BIGNUM *w, const BIGNUM *a, const BIGNUM *a1,
-        const BIGNUM *a1_odd, int k, BN_CTX *ctx, BN_MONT_CTX *mont);
+    const BIGNUM *a1_odd, int k, BN_CTX *ctx, BN_MONT_CTX *mont);
 static int probable_prime(BIGNUM *rnd, int bits);
 static int probable_prime_dh(BIGNUM *rnd, int bits,
-        const BIGNUM *add, const BIGNUM *rem, BN_CTX *ctx);
+    const BIGNUM *add, const BIGNUM *rem, BN_CTX *ctx);
 static int probable_prime_dh_safe(BIGNUM *rnd, int bits,
-        const BIGNUM *add, const BIGNUM *rem, BN_CTX *ctx);
+    const BIGNUM *add, const BIGNUM *rem, BN_CTX *ctx);
 
-int BN_GENCB_call(BN_GENCB *cb, int a, int b)
-        {
+int
+BN_GENCB_call(BN_GENCB *cb, int a, int b)
+{
         /* No callback means continue */
-        if(!cb) return 1;
-        switch(cb->ver)
-                {
+        if (!cb)
+                return 1;
+        switch (cb->ver) {
         case 1:
                 /* Deprecated-style callbacks */
-                if(!cb->cb.cb_1)
+                if (!cb->cb.cb_1)
                         return 1;
                 cb->cb.cb_1(a, b, cb->arg);
                 return 1;
@@ -151,98 +152,101 @@ int BN_GENCB_call(BN_GENCB *cb, int a, int b)
                 return cb->cb.cb_2(a, b, cb);
         default:
                 break;
-                }
+        }
         /* Unrecognised callback type */
         return 0;
-        }
+}
 
-int BN_generate_prime_ex(BIGNUM *ret, int bits, int safe,
-        const BIGNUM *add, const BIGNUM *rem, BN_GENCB *cb)
-        {
+int
+BN_generate_prime_ex(BIGNUM *ret, int bits, int safe, const BIGNUM *add,
+    const BIGNUM *rem, BN_GENCB *cb)
+{
         BIGNUM *t;
-        int found=0;
-        int i,j,c1=0;
+        int found = 0;
+        int i, j, c1 = 0;
         BN_CTX *ctx;
         int checks = BN_prime_checks_for_size(bits);
 
-        ctx=BN_CTX_new();
-        if (ctx == NULL) goto err;
+        ctx = BN_CTX_new();
+        if (ctx == NULL)
+                goto err;
         BN_CTX_start(ctx);
         t = BN_CTX_get(ctx);
-        if(!t) goto err;
-loop: 
+        if (!t)
+                goto err;
+loop:
         /* make a random number and set the top and bottom bits */
-        if (add == NULL)
-                {
-                if (!probable_prime(ret,bits)) goto err;
-                }
-        else
-                {
-                if (safe)
-                        {
-                        if (!probable_prime_dh_safe(ret,bits,add,rem,ctx))
-                                 goto err;
-                        }
-                else
-                        {
-                        if (!probable_prime_dh(ret,bits,add,rem,ctx))
+        if (add == NULL) {
+                if (!probable_prime(ret, bits))
+                        goto err;
+        } else {
+                if (safe) {
+                        if (!probable_prime_dh_safe(ret, bits, add, rem, ctx))
+                                goto err;
+                } else {
+                        if (!probable_prime_dh(ret, bits, add, rem, ctx))
                                 goto err;
-                        }
                 }
+        }
         /* if (BN_mod_word(ret,(BN_ULONG)3) == 1) goto loop; */
-        if(!BN_GENCB_call(cb, 0, c1++))
+        if (!BN_GENCB_call(cb, 0, c1++))
                 /* aborted */
                 goto err;
 
-        if (!safe)
-                {
-                i=BN_is_prime_fasttest_ex(ret,checks,ctx,0,cb);
-                if (i == -1) goto err;
-                if (i == 0) goto loop;
-                }
-        else
-                {
+        if (!safe) {
+                i = BN_is_prime_fasttest_ex(ret, checks, ctx, 0, cb);
+                if (i == -1)
+                        goto err;
+                if (i == 0)
+                        goto loop;
+        } else {
                 /* for "safe prime" generation,
                  * check that (p-1)/2 is prime.
                  * Since a prime is odd, We just
                  * need to divide by 2 */
-                if (!BN_rshift1(t,ret)) goto err;
+                if (!BN_rshift1(t, ret))
+                        goto err;
 
-                for (i=0; i<checks; i++)
-                        {
-                        j=BN_is_prime_fasttest_ex(ret,1,ctx,0,cb);
-                        if (j == -1) goto err;
-                        if (j == 0) goto loop;
+                for (i = 0; i < checks; i++) {
+                        j = BN_is_prime_fasttest_ex(ret, 1, ctx, 0, cb);
+                        if (j == -1)
+                                goto err;
+                        if (j == 0)
+                                goto loop;
 
-                        j=BN_is_prime_fasttest_ex(t,1,ctx,0,cb);
-                        if (j == -1) goto err;
-                        if (j == 0) goto loop;
+                        j = BN_is_prime_fasttest_ex(t, 1, ctx, 0, cb);
+                        if (j == -1)
+                                goto err;
+                        if (j == 0)
+                                goto loop;
 
-                        if(!BN_GENCB_call(cb, 2, c1-1))
+                        if (!BN_GENCB_call(cb, 2, c1 - 1))
                                 goto err;
                         /* We have a safe prime test pass */
-                        }
                 }
+        }
         /* we have a prime :-) */
         found = 1;
+
 err:
-        if (ctx != NULL)
-                {
+        if (ctx != NULL) {
                 BN_CTX_end(ctx);
                 BN_CTX_free(ctx);
-                }
+        }
         bn_check_top(ret);
         return found;
-        }
+}
 
-int BN_is_prime_ex(const BIGNUM *a, int checks, BN_CTX *ctx_passed, BN_GENCB *cb)
-        {
+int
+BN_is_prime_ex(const BIGNUM *a, int checks, BN_CTX *ctx_passed, BN_GENCB *cb)
+{
         return BN_is_prime_fasttest_ex(a, checks, ctx_passed, 0, cb);
-        }
+}
 
-int BN_is_prime_fasttest_ex(const BIGNUM *a, int checks, BN_CTX *ctx_passed,
-                int do_trial_division, BN_GENCB *cb)
-        {
+int
+BN_is_prime_fasttest_ex(const BIGNUM *a, int checks, BN_CTX *ctx_passed,
+    int do_trial_division, BN_GENCB *cb)
+{
         int i, j, ret = -1;
         int k;
         BN_CTX *ctx = NULL;
@@ -252,7 +256,7 @@ int BN_is_prime_fasttest_ex(const BIGNUM *a, int checks, BN_CTX *ctx_passed,
 
         if (BN_cmp(a, BN_value_one()) <= 0)
                 return 0;
-        
+
         if (checks == BN_prime_checks)
                 checks = BN_prime_checks_for_size(BN_num_bits(a));
 
@@ -260,48 +264,45 @@ int BN_is_prime_fasttest_ex(const BIGNUM *a, int checks, BN_CTX *ctx_passed,
         if (!BN_is_odd(a))
                 /* a is even => a is prime if and only if a == 2 */
                 return BN_is_word(a, 2);
-        if (do_trial_division)
-                {
+        if (do_trial_division) {
                 for (i = 1; i < NUMPRIMES; i++)
-                        if (BN_mod_word(a, primes[i]) == 0) 
+                        if (BN_mod_word(a, primes[i]) == 0)
                                 return 0;
-                if(!BN_GENCB_call(cb, 1, -1))
+                if (!BN_GENCB_call(cb, 1, -1))
                         goto err;
-                }
+        }
 
         if (ctx_passed != NULL)
                 ctx = ctx_passed;
-        else
-                if ((ctx=BN_CTX_new()) == NULL)
-                        goto err;
+        else if ((ctx = BN_CTX_new()) == NULL)
+                goto err;
         BN_CTX_start(ctx);
 
         /* A := abs(a) */
-        if (a->neg)
-                {
+        if (a->neg) {
                 BIGNUM *t;
-                if ((t = BN_CTX_get(ctx)) == NULL) goto err;
+                if ((t = BN_CTX_get(ctx)) == NULL)
+                        goto err;
                 BN_copy(t, a);
                 t->neg = 0;
                 A = t;
-                }
-        else
+        } else
                 A = a;
         A1 = BN_CTX_get(ctx);
         A1_odd = BN_CTX_get(ctx);
         check = BN_CTX_get(ctx);
-        if (check == NULL) goto err;
+        if (check == NULL)
+                goto err;
 
         /* compute A1 := A - 1 */
         if (!BN_copy(A1, A))
                 goto err;
         if (!BN_sub_word(A1, 1))
                 goto err;
-        if (BN_is_zero(A1))
-                {
+        if (BN_is_zero(A1)) {
                 ret = 0;
                 goto err;
-                }
+        }
 
         /* write  A1  as  A1_odd * 2^k */
         k = 1;
@@ -316,9 +317,8 @@ int BN_is_prime_fasttest_ex(const BIGNUM *a, int checks, BN_CTX *ctx_passed,
                 goto err;
         if (!BN_MONT_CTX_set(mont, A, ctx))
                 goto err;
-        
-        for (i = 0; i < checks; i++)
-                {
+
+        for (i = 0; i < checks; i++) {
                 if (!BN_pseudo_rand_range(check, A1))
                         goto err;
                 if (!BN_add_word(check, 1))
@@ -326,40 +326,41 @@ int BN_is_prime_fasttest_ex(const BIGNUM *a, int checks, BN_CTX *ctx_passed,
                 /* now 1 <= check < A */
 
                 j = witness(check, A, A1, A1_odd, k, ctx, mont);
-                if (j == -1) goto err;
-                if (j)
-                        {
-                        ret=0;
+                if (j == -1)
                         goto err;
-                        }
-                if(!BN_GENCB_call(cb, 1, i))
+                if (j) {
+                        ret = 0;
                         goto err;
                 }
-        ret=1;
+                if (!BN_GENCB_call(cb, 1, i))
+                        goto err;
+        }
+        ret = 1;
+
 err:
-        if (ctx != NULL)
-                {
+        if (ctx != NULL) {
                 BN_CTX_end(ctx);
                 if (ctx_passed == NULL)
                         BN_CTX_free(ctx);
-                }
+        }
         if (mont != NULL)
                 BN_MONT_CTX_free(mont);
 
-        return(ret);
-        }
+        return (ret);
+}
 
-static int witness(BIGNUM *w, const BIGNUM *a, const BIGNUM *a1,
-        const BIGNUM *a1_odd, int k, BN_CTX *ctx, BN_MONT_CTX *mont)
-        {
-        if (!BN_mod_exp_mont(w, w, a1_odd, a, ctx, mont)) /* w := w^a1_odd mod a */
+static int
+witness(BIGNUM *w, const BIGNUM *a, const BIGNUM *a1, const BIGNUM *a1_odd,
+    int k, BN_CTX *ctx, BN_MONT_CTX *mont)
+{
+        if (!BN_mod_exp_mont(w, w, a1_odd, a, ctx, mont))
+                /* w := w^a1_odd mod a */
                 return -1;
         if (BN_is_one(w))
                 return 0; /* probably prime */
         if (BN_cmp(w, a1) == 0)
                 return 0; /* w == -1 (mod a),  'a' is probably prime */
-        while (--k)
-                {
+        while (--k) {
                 if (!BN_mod_mul(w, w, w, a, ctx)) /* w := w^2 mod a */
                         return -1;
                 if (BN_is_one(w))
@@ -367,128 +368,152 @@ static int witness(BIGNUM *w, const BIGNUM *a, const BIGNUM *a1,
                                    * have been == -1 (mod 'a') */
                 if (BN_cmp(w, a1) == 0)
                         return 0; /* w == -1 (mod a), 'a' is probably prime */
-                }
+        }
         /* If we get here, 'w' is the (a-1)/2-th power of the original 'w',
          * and it is neither -1 nor +1 -- so 'a' cannot be prime */
         bn_check_top(w);
         return 1;
-        }
+}
 
-static int probable_prime(BIGNUM *rnd, int bits)
-        {
+static int
+probable_prime(BIGNUM *rnd, int bits)
+{
         int i;
         prime_t mods[NUMPRIMES];
-        BN_ULONG delta,maxdelta;
+        BN_ULONG delta, maxdelta;
 
 again:
-        if (!BN_rand(rnd,bits,1,1)) return(0);
+        if (!BN_rand(rnd, bits, 1, 1))
+                return (0);
         /* we now have a random number 'rand' to test. */
-        for (i=1; i<NUMPRIMES; i++)
-                mods[i]=(prime_t)BN_mod_word(rnd,(BN_ULONG)primes[i]);
-        maxdelta=BN_MASK2 - primes[NUMPRIMES-1];
-        delta=0;
-        loop: for (i=1; i<NUMPRIMES; i++)
-                {
+        for (i = 1; i < NUMPRIMES; i++)
+                mods[i] = (prime_t)BN_mod_word(rnd, (BN_ULONG)primes[i]);
+        maxdelta = BN_MASK2 - primes[NUMPRIMES - 1];
+        delta = 0;
+loop:
+        for (i = 1; i < NUMPRIMES; i++) {
                 /* check that rnd is not a prime and also
                  * that gcd(rnd-1,primes) == 1 (except for 2) */
-                if (((mods[i]+delta)%primes[i]) <= 1)
-                        {
-                        delta+=2;
-                        if (delta > maxdelta) goto again;
+                if (((mods[i] + delta) % primes[i]) <= 1) {
+                        delta += 2;
+                        if (delta > maxdelta)
+                                goto again;
                         goto loop;
-                        }
                 }
-        if (!BN_add_word(rnd,delta)) return(0);
-        bn_check_top(rnd);
-        return(1);
         }
-
-static int probable_prime_dh(BIGNUM *rnd, int bits,
-        const BIGNUM *add, const BIGNUM *rem, BN_CTX *ctx)
-        {
-        int i,ret=0;
+        if (!BN_add_word(rnd, delta))
+                return (0);
+        bn_check_top(rnd);
+        return (1);
+}
+
+static int
+probable_prime_dh(BIGNUM *rnd, int bits, const BIGNUM *add, const BIGNUM *rem,
+    BN_CTX *ctx)
+{
+        int i, ret = 0;
         BIGNUM *t1;
 
         BN_CTX_start(ctx);
-        if ((t1 = BN_CTX_get(ctx)) == NULL) goto err;
+        if ((t1 = BN_CTX_get(ctx)) == NULL)
+                goto err;
 
-        if (!BN_rand(rnd,bits,0,1)) goto err;
+        if (!BN_rand(rnd, bits, 0, 1))
+                goto err;
 
         /* we need ((rnd-rem) % add) == 0 */
 
-        if (!BN_mod(t1,rnd,add,ctx)) goto err;
-        if (!BN_sub(rnd,rnd,t1)) goto err;
-        if (rem == NULL)
-                { if (!BN_add_word(rnd,1)) goto err; }
-        else
-                { if (!BN_add(rnd,rnd,rem)) goto err; }
+        if (!BN_mod(t1, rnd, add, ctx))
+                goto err;
+        if (!BN_sub(rnd, rnd, t1))
+                goto err;
+        if (rem == NULL) {
+                if (!BN_add_word(rnd, 1))
+                        goto err;
+        } else {
+                if (!BN_add(rnd, rnd, rem))
+                        goto err;
+        }
 
         /* we now have a random number 'rand' to test. */
 
-        loop: for (i=1; i<NUMPRIMES; i++)
-                {
+loop:
+        for (i = 1; i < NUMPRIMES; i++) {
                 /* check that rnd is a prime */
-                if (BN_mod_word(rnd,(BN_ULONG)primes[i]) <= 1)
-                        {
-                        if (!BN_add(rnd,rnd,add)) goto err;
+                if (BN_mod_word(rnd, (BN_ULONG)primes[i]) <= 1) {
+                        if (!BN_add(rnd, rnd, add))
+                                goto err;
                         goto loop;
-                        }
                 }
-        ret=1;
+        }
+        ret = 1;
+
 err:
         BN_CTX_end(ctx);
         bn_check_top(rnd);
-        return(ret);
-        }
+        return (ret);
+}
 
-static int probable_prime_dh_safe(BIGNUM *p, int bits, const BIGNUM *padd,
-        const BIGNUM *rem, BN_CTX *ctx)
-        {
-        int i,ret=0;
-        BIGNUM *t1,*qadd,*q;
+static int
+probable_prime_dh_safe(BIGNUM *p, int bits, const BIGNUM *padd,
+    const BIGNUM *rem, BN_CTX *ctx)
+{
+        int i, ret = 0;
+        BIGNUM *t1, *qadd, *q;
 
         bits--;
         BN_CTX_start(ctx);
         t1 = BN_CTX_get(ctx);
         q = BN_CTX_get(ctx);
         qadd = BN_CTX_get(ctx);
-        if (qadd == NULL) goto err;
+        if (qadd == NULL)
+                goto err;
+
+        if (!BN_rshift1(qadd, padd))
+                goto err;
 
-        if (!BN_rshift1(qadd,padd)) goto err;
-                
-        if (!BN_rand(q,bits,0,1)) goto err;
+        if (!BN_rand(q, bits, 0, 1))
+                goto err;
 
         /* we need ((rnd-rem) % add) == 0 */
-        if (!BN_mod(t1,q,qadd,ctx)) goto err;
-        if (!BN_sub(q,q,t1)) goto err;
-        if (rem == NULL)
-                { if (!BN_add_word(q,1)) goto err; }
-        else
-                {
-                if (!BN_rshift1(t1,rem)) goto err;
-                if (!BN_add(q,q,t1)) goto err;
-                }
+        if (!BN_mod(t1, q,qadd, ctx))
+                goto err;
+        if (!BN_sub(q, q, t1))
+                goto err;
+        if (rem == NULL) {
+                if (!BN_add_word(q, 1))
+                        goto err;
+        } else {
+                if (!BN_rshift1(t1, rem))
+                        goto err;
+                if (!BN_add(q, q, t1))
+                        goto err;
+        }
 
         /* we now have a random number 'rand' to test. */
-        if (!BN_lshift1(p,q)) goto err;
-        if (!BN_add_word(p,1)) goto err;
+        if (!BN_lshift1(p, q))
+                goto err;
+        if (!BN_add_word(p, 1))
+                goto err;
 
-        loop: for (i=1; i<NUMPRIMES; i++)
-                {
+loop:
+        for (i = 1; i < NUMPRIMES; i++) {
                 /* check that p and q are prime */
                 /* check that for p and q
                  * gcd(p-1,primes) == 1 (except for 2) */
-                if (    (BN_mod_word(p,(BN_ULONG)primes[i]) == 0) ||
-                        (BN_mod_word(q,(BN_ULONG)primes[i]) == 0))
-                        {
-                        if (!BN_add(p,p,padd)) goto err;
-                        if (!BN_add(q,q,qadd)) goto err;
+                if ((BN_mod_word(p, (BN_ULONG)primes[i]) == 0) ||
+                    (BN_mod_word(q, (BN_ULONG)primes[i]) == 0)) {
+                        if (!BN_add(p, p, padd))
+                                goto err;
+                        if (!BN_add(q, q, qadd))
+                                goto err;
                         goto loop;
-                        }
                 }
-        ret=1;
+        }
+        ret = 1;
+
 err:
         BN_CTX_end(ctx);
         bn_check_top(p);
-        return(ret);
-        }
+        return (ret);
+}