-/* crypto/rsa/rsa_gen.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* 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:
* 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
* 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
* [including the GNU Public Licence.]
*/
-
-/* NB: these functions have been "upgraded", the deprecated versions (which are
- * compatibility wrappers using these functions) are in rsa_depr.c.
- * - Geoff
+/*
+ * NB: these functions have been "upgraded", the deprecated versions (which
+ * are compatibility wrappers using these functions) are in rsa_depr.c. -
+ * Geoff
*/
#include <stdio.h>
#include <time.h>
-#include "cryptlib.h"
+#include "internal/cryptlib.h"
#include <openssl/bn.h>
-#include <openssl/rsa.h>
-
-int RSA_generate_key_ex(RSA *rsa, int bits, unsigned long e_value, BN_GENCB *cb)
- {
- BIGNUM *r0=NULL,*r1=NULL,*r2=NULL,*r3=NULL,*tmp;
- int bitsp,bitsq,ok= -1,n=0,i;
- BN_CTX *ctx=NULL,*ctx2=NULL;
-
- ctx=BN_CTX_new();
- if (ctx == NULL) goto err;
- ctx2=BN_CTX_new();
- if (ctx2 == NULL) goto err;
- BN_CTX_start(ctx);
- r0 = BN_CTX_get(ctx);
- r1 = BN_CTX_get(ctx);
- r2 = BN_CTX_get(ctx);
- r3 = BN_CTX_get(ctx);
- if (r3 == NULL) goto err;
-
- bitsp=(bits+1)/2;
- bitsq=bits-bitsp;
-
- /* We need the RSA components non-NULL */
- if(!rsa->n && ((rsa->n=BN_new()) == NULL)) goto err;
- if(!rsa->d && ((rsa->d=BN_new()) == NULL)) goto err;
- if(!rsa->e && ((rsa->e=BN_new()) == NULL)) goto err;
- if(!rsa->p && ((rsa->p=BN_new()) == NULL)) goto err;
- if(!rsa->q && ((rsa->q=BN_new()) == NULL)) goto err;
- if(!rsa->dmp1 && ((rsa->dmp1=BN_new()) == NULL)) goto err;
- if(!rsa->dmq1 && ((rsa->dmq1=BN_new()) == NULL)) goto err;
- if(!rsa->iqmp && ((rsa->iqmp=BN_new()) == NULL)) goto err;
-
-#if 1
- /* The problem is when building with 8, 16, or 32 BN_ULONG,
- * unsigned long can be larger */
- for (i=0; i<sizeof(unsigned long)*8; i++)
- {
- if (e_value & (1UL<<i))
- BN_set_bit(rsa->e,i);
- }
-#else
- if (!BN_set_word(rsa->e,e_value)) goto err;
-#endif
-
- /* generate p and q */
- for (;;)
- {
- if(!BN_generate_prime_ex(rsa->p, bitsp, 0, NULL, NULL, cb))
- goto err;
- if (!BN_sub(r2,rsa->p,BN_value_one())) goto err;
- if (!BN_gcd(r1,r2,rsa->e,ctx)) goto err;
- if (BN_is_one(r1)) break;
- if(!BN_GENCB_call(cb, 2, n++))
- goto err;
- }
- if(!BN_GENCB_call(cb, 3, 0))
- goto err;
- for (;;)
- {
- if(!BN_generate_prime_ex(rsa->q, bitsq, 0, NULL, NULL, cb))
- goto err;
- if (!BN_sub(r2,rsa->q,BN_value_one())) goto err;
- if (!BN_gcd(r1,r2,rsa->e,ctx)) goto err;
- if (BN_is_one(r1) && (BN_cmp(rsa->p,rsa->q) != 0))
- break;
- if(!BN_GENCB_call(cb, 2, n++))
- goto err;
- }
- if(!BN_GENCB_call(cb, 3, 1))
- goto err;
- if (BN_cmp(rsa->p,rsa->q) < 0)
- {
- tmp=rsa->p;
- rsa->p=rsa->q;
- rsa->q=tmp;
- }
-
- /* calculate n */
- if (!BN_mul(rsa->n,rsa->p,rsa->q,ctx)) goto err;
-
- /* calculate d */
- if (!BN_sub(r1,rsa->p,BN_value_one())) goto err; /* p-1 */
- if (!BN_sub(r2,rsa->q,BN_value_one())) goto err; /* q-1 */
- if (!BN_mul(r0,r1,r2,ctx)) goto err; /* (p-1)(q-1) */
-
-/* should not be needed, since gcd(p-1,e) == 1 and gcd(q-1,e) == 1 */
-/* for (;;)
- {
- if (!BN_gcd(r3,r0,rsa->e,ctx)) goto err;
- if (BN_is_one(r3)) break;
-
- if (1)
- {
- if (!BN_add_word(rsa->e,2L)) goto err;
- continue;
- }
- RSAerr(RSA_F_RSA_GENERATE_KEY,RSA_R_BAD_E_VALUE);
- goto err;
- }
-*/
- if (!BN_mod_inverse(rsa->d,rsa->e,r0,ctx2)) goto err; /* d */
-
- /* calculate d mod (p-1) */
- if (!BN_mod(rsa->dmp1,rsa->d,r1,ctx)) goto err;
-
- /* calculate d mod (q-1) */
- if (!BN_mod(rsa->dmq1,rsa->d,r2,ctx)) goto err;
-
- /* calculate inverse of q mod p */
- if (!BN_mod_inverse(rsa->iqmp,rsa->q,rsa->p,ctx2)) goto err;
-
- ok=1;
-err:
- if (ok == -1)
- {
- RSAerr(RSA_F_RSA_GENERATE_KEY,ERR_LIB_BN);
- ok=0;
- }
- BN_CTX_end(ctx);
- BN_CTX_free(ctx);
- BN_CTX_free(ctx2);
-
- return ok;
- }
+#include "rsa_locl.h"
+
+static int rsa_builtin_keygen(RSA *rsa, int bits, BIGNUM *e_value,
+ BN_GENCB *cb);
+
+/*
+ * NB: this wrapper would normally be placed in rsa_lib.c and the static
+ * implementation would probably be in rsa_eay.c. Nonetheless, is kept here
+ * so that we don't introduce a new linker dependency. Eg. any application
+ * that wasn't previously linking object code related to key-generation won't
+ * have to now just because key-generation is part of RSA_METHOD.
+ */
+int RSA_generate_key_ex(RSA *rsa, int bits, BIGNUM *e_value, BN_GENCB *cb)
+{
+ if (rsa->meth->rsa_keygen)
+ return rsa->meth->rsa_keygen(rsa, bits, e_value, cb);
+ return rsa_builtin_keygen(rsa, bits, e_value, cb);
+}
+
+static int rsa_builtin_keygen(RSA *rsa, int bits, BIGNUM *e_value,
+ BN_GENCB *cb)
+{
+ BIGNUM *r0 = NULL, *r1 = NULL, *r2 = NULL, *r3 = NULL, *tmp;
+ int bitsp, bitsq, ok = -1, n = 0;
+ BN_CTX *ctx = NULL;
+
+ ctx = BN_CTX_new();
+ if (ctx == NULL)
+ goto err;
+ BN_CTX_start(ctx);
+ r0 = BN_CTX_get(ctx);
+ r1 = BN_CTX_get(ctx);
+ r2 = BN_CTX_get(ctx);
+ r3 = BN_CTX_get(ctx);
+ if (r3 == NULL)
+ goto err;
+
+ bitsp = (bits + 1) / 2;
+ bitsq = bits - bitsp;
+
+ /* We need the RSA components non-NULL */
+ if (!rsa->n && ((rsa->n = BN_new()) == NULL))
+ goto err;
+ if (!rsa->d && ((rsa->d = BN_secure_new()) == NULL))
+ goto err;
+ if (!rsa->e && ((rsa->e = BN_new()) == NULL))
+ goto err;
+ if (!rsa->p && ((rsa->p = BN_secure_new()) == NULL))
+ goto err;
+ if (!rsa->q && ((rsa->q = BN_secure_new()) == NULL))
+ goto err;
+ if (!rsa->dmp1 && ((rsa->dmp1 = BN_secure_new()) == NULL))
+ goto err;
+ if (!rsa->dmq1 && ((rsa->dmq1 = BN_secure_new()) == NULL))
+ goto err;
+ if (!rsa->iqmp && ((rsa->iqmp = BN_secure_new()) == NULL))
+ goto err;
+
+ BN_copy(rsa->e, e_value);
+
+ /* generate p and q */
+ for (;;) {
+ if (!BN_generate_prime_ex(rsa->p, bitsp, 0, NULL, NULL, cb))
+ goto err;
+ if (!BN_sub(r2, rsa->p, BN_value_one()))
+ goto err;
+ if (!BN_gcd(r1, r2, rsa->e, ctx))
+ goto err;
+ if (BN_is_one(r1))
+ break;
+ if (!BN_GENCB_call(cb, 2, n++))
+ goto err;
+ }
+ if (!BN_GENCB_call(cb, 3, 0))
+ goto err;
+ for (;;) {
+ /*
+ * When generating ridiculously small keys, we can get stuck
+ * continually regenerating the same prime values. Check for this and
+ * bail if it happens 3 times.
+ */
+ unsigned int degenerate = 0;
+ do {
+ if (!BN_generate_prime_ex(rsa->q, bitsq, 0, NULL, NULL, cb))
+ goto err;
+ } while ((BN_cmp(rsa->p, rsa->q) == 0) && (++degenerate < 3));
+ if (degenerate == 3) {
+ ok = 0; /* we set our own err */
+ RSAerr(RSA_F_RSA_BUILTIN_KEYGEN, RSA_R_KEY_SIZE_TOO_SMALL);
+ goto err;
+ }
+ if (!BN_sub(r2, rsa->q, BN_value_one()))
+ goto err;
+ if (!BN_gcd(r1, r2, rsa->e, ctx))
+ goto err;
+ if (BN_is_one(r1))
+ break;
+ if (!BN_GENCB_call(cb, 2, n++))
+ goto err;
+ }
+ if (!BN_GENCB_call(cb, 3, 1))
+ goto err;
+ if (BN_cmp(rsa->p, rsa->q) < 0) {
+ tmp = rsa->p;
+ rsa->p = rsa->q;
+ rsa->q = tmp;
+ }
+
+ /* calculate n */
+ if (!BN_mul(rsa->n, rsa->p, rsa->q, ctx))
+ goto err;
+
+ /* calculate d */
+ if (!BN_sub(r1, rsa->p, BN_value_one()))
+ goto err; /* p-1 */
+ if (!BN_sub(r2, rsa->q, BN_value_one()))
+ goto err; /* q-1 */
+ if (!BN_mul(r0, r1, r2, ctx))
+ goto err; /* (p-1)(q-1) */
+ {
+ BIGNUM *local_r0 = NULL, *pr0;
+ if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME)) {
+ pr0 = local_r0 = BN_new();
+ if (local_r0 == NULL)
+ goto err;
+ BN_with_flags(pr0, r0, BN_FLG_CONSTTIME);
+ } else {
+ pr0 = r0;
+ }
+ if (!BN_mod_inverse(rsa->d, rsa->e, pr0, ctx)) {
+ BN_free(local_r0);
+ goto err; /* d */
+ }
+ /* We MUST free local_r0 before any further use of r0 */
+ BN_free(local_r0);
+ }
+
+ {
+ BIGNUM *local_d = NULL, *d;
+ /* set up d for correct BN_FLG_CONSTTIME flag */
+ if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME)) {
+ d = local_d = BN_new();
+ if (local_d == NULL)
+ goto err;
+ BN_with_flags(d, rsa->d, BN_FLG_CONSTTIME);
+ } else {
+ d = rsa->d;
+ }
+
+ if ( /* calculate d mod (p-1) */
+ !BN_mod(rsa->dmp1, d, r1, ctx)
+ /* calculate d mod (q-1) */
+ || !BN_mod(rsa->dmq1, d, r2, ctx)) {
+ BN_free(local_d);
+ goto err;
+ }
+ /* We MUST free local_d before any further use of rsa->d */
+ BN_free(local_d);
+ }
+
+ {
+ BIGNUM *local_p = NULL, *p;
+
+ /* calculate inverse of q mod p */
+ if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME)) {
+ p = local_p = BN_new();
+ if (local_p == NULL)
+ goto err;
+ BN_with_flags(p, rsa->p, BN_FLG_CONSTTIME);
+ } else {
+ p = rsa->p;
+ }
+ if (!BN_mod_inverse(rsa->iqmp, rsa->q, p, ctx)) {
+ BN_free(local_p);
+ goto err;
+ }
+ /* We MUST free local_p before any further use of rsa->p */
+ BN_free(local_p);
+ }
+
+ ok = 1;
+ err:
+ if (ok == -1) {
+ RSAerr(RSA_F_RSA_BUILTIN_KEYGEN, ERR_LIB_BN);
+ ok = 0;
+ }
+ if (ctx != NULL)
+ BN_CTX_end(ctx);
+ BN_CTX_free(ctx);
+ return ok;
+}
projects / openssl.git / blobdiff