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C++ BN_mod_exp函数代码示例

原作者: [db:作者] 来自: [db:来源] 收藏 邀请

本文整理汇总了C++中BN_mod_exp函数的典型用法代码示例。如果您正苦于以下问题：C++ BN_mod_exp函数的具体用法？C++ BN_mod_exp怎么用？C++ BN_mod_exp使用的例子？那么恭喜您, 这里精选的函数代码示例或许可以为您提供帮助。



在下文中一共展示了BN_mod_exp函数的20个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于我们的系统推荐出更棒的C++代码示例。

示例1: DSA_new

static EVP_PKEY *b2i_dss(const unsigned char **in, unsigned int length,
						unsigned int bitlen, int ispub)
	{
	const unsigned char *p = *in;
	EVP_PKEY *ret = NULL;
	DSA *dsa = NULL;
	BN_CTX *ctx = NULL;
	unsigned int nbyte;
	nbyte = (bitlen + 7) >> 3;

	dsa = DSA_new();
	ret = EVP_PKEY_new();
	if (!dsa || !ret)
		goto memerr;
	if (!read_lebn(&p, nbyte, &dsa->p))
		goto memerr;
	if (!read_lebn(&p, 20, &dsa->q))
		goto memerr;
	if (!read_lebn(&p, nbyte, &dsa->g))
		goto memerr;
	if (ispub)
		{
		if (!read_lebn(&p, nbyte, &dsa->pub_key))
			goto memerr;
		}
	else
		{
		if (!read_lebn(&p, 20, &dsa->priv_key))
			goto memerr;
		/* Calculate public key */
		if (!(dsa->pub_key = BN_new()))
			goto memerr;
		if (!(ctx = BN_CTX_new()))
			goto memerr;
			
		if (!BN_mod_exp(dsa->pub_key, dsa->g,
						 dsa->priv_key, dsa->p, ctx))
			
			goto memerr;
		BN_CTX_free(ctx);
		}

	EVP_PKEY_set1_DSA(ret, dsa);
	DSA_free(dsa);
	*in = p;
	return ret;

	memerr:
	PEMerr(PEM_F_B2I_DSS, ERR_R_MALLOC_FAILURE);
	if (dsa)
		DSA_free(dsa);
	if (ret)
		EVP_PKEY_free(ret);
	if (ctx)
		BN_CTX_free(ctx);
	return NULL;
	}
开发者ID:Wampamba-Nooh，项目名称:MicroFrameworkSDK-Mono，代码行数:57，代码来源:pvkfmt.cpp


示例2: rsaEXP

void rsaEXP(BIGNUM *message , rsaKey * key){

	BN_CTX * t = BN_CTX_new();

	BN_mod_exp(message , message, key->exponent , key->modulo , t);
	
	BN_CTX_free(t);

}
开发者ID:parzio，项目名称:crypto-secure-communication，代码行数:9，代码来源:common.c


示例3: BN_new

void Person::set_keys() {
  a = BN_new();
  BN_rand_range(a, p);
  A = BN_new();
  BN_CTX *ctx = BN_CTX_new();
  BN_mod_exp(A, g, a, p, ctx);

  if (ctx) BN_CTX_free(ctx);
}
开发者ID:imhotepisinvisible，项目名称:cryptopals，代码行数:9，代码来源:person.cpp


示例4: dsa_builtin_keygen

static int dsa_builtin_keygen(DSA *dsa)
{
    int ok = 0;
    BN_CTX *ctx = NULL;
    BIGNUM *pub_key = NULL, *priv_key = NULL;

    if ((ctx = BN_CTX_new()) == NULL)
        goto err;

    if (dsa->priv_key == NULL) {
        if ((priv_key = BN_secure_new()) == NULL)
            goto err;
    } else
        priv_key = dsa->priv_key;

    do
        if (!BN_rand_range(priv_key, dsa->q))
            goto err;
    while (BN_is_zero(priv_key)) ;

    if (dsa->pub_key == NULL) {
        if ((pub_key = BN_new()) == NULL)
            goto err;
    } else
        pub_key = dsa->pub_key;

    {
        BIGNUM *local_prk = NULL;
        BIGNUM *prk;

        if ((dsa->flags & DSA_FLAG_NO_EXP_CONSTTIME) == 0) {
            local_prk = prk = BN_new();
            if (!local_prk)
                goto err;
            BN_with_flags(prk, priv_key, BN_FLG_CONSTTIME);
        } else
            prk = priv_key;

        if (!BN_mod_exp(pub_key, dsa->g, prk, dsa->p, ctx)) {
            BN_free(local_prk);
            goto err;
        }
        BN_free(local_prk);
    }

    dsa->priv_key = priv_key;
    dsa->pub_key = pub_key;
    ok = 1;

 err:
    if (pub_key != dsa->pub_key)
        BN_free(pub_key);
    if (priv_key != dsa->priv_key)
        BN_free(priv_key);
    BN_CTX_free(ctx);
    return (ok);
}
开发者ID:TheTypoMaster，项目名称:openssl，代码行数:57，代码来源:dsa_key.c


示例5: ubsec_mod_exp

static int ubsec_mod_exp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
                         const BIGNUM *m, BN_CTX *ctx)
{
    int y_len = 0;
    int fd;

    if (ubsec_dso == NULL) {
        UBSECerr(UBSEC_F_UBSEC_MOD_EXP, UBSEC_R_NOT_LOADED);
        return 0;
    }

    /* Check if hardware can't handle this argument. */
    y_len = BN_num_bits(m);
    if (y_len > max_key_len) {
        UBSECerr(UBSEC_F_UBSEC_MOD_EXP, UBSEC_R_SIZE_TOO_LARGE_OR_TOO_SMALL);
        return BN_mod_exp(r, a, p, m, ctx);
    }

    if (!bn_wexpand(r, m->top)) {
        UBSECerr(UBSEC_F_UBSEC_MOD_EXP, UBSEC_R_BN_EXPAND_FAIL);
        return 0;
    }

    if ((fd = p_UBSEC_ubsec_open(UBSEC_KEY_DEVICE_NAME)) <= 0) {
        fd = 0;
        UBSECerr(UBSEC_F_UBSEC_MOD_EXP, UBSEC_R_UNIT_FAILURE);
        return BN_mod_exp(r, a, p, m, ctx);
    }

    if (p_UBSEC_rsa_mod_exp_ioctl(fd, (unsigned char *)a->d, BN_num_bits(a),
                                  (unsigned char *)m->d, BN_num_bits(m),
                                  (unsigned char *)p->d, BN_num_bits(p),
                                  (unsigned char *)r->d, &y_len) != 0) {
        UBSECerr(UBSEC_F_UBSEC_MOD_EXP, UBSEC_R_REQUEST_FAILED);
        p_UBSEC_ubsec_close(fd);

        return BN_mod_exp(r, a, p, m, ctx);
    }

    p_UBSEC_ubsec_close(fd);

    r->top = (BN_num_bits(m) + BN_BITS2 - 1) / BN_BITS2;
    return 1;
}
开发者ID:GarikRC，项目名称:openssl，代码行数:44，代码来源:e_ubsec.c


示例6: AO_vrfy

int AO_vrfy(void *inner)
{
    assert(inner!=NULL);
    AOInner *self = (AOInner*)inner;
    
    int ret;
    BIGNUM *rbn;
    
    /* e_bytes~ := H(n) */
    VHash(self->n, self->bytelen_rec+self->bytelen_red, self->v_e_bytes, self->bytelen_q);

    /* e~ := int(e_bytes) */
    rbn = BN_bin2bn(self->v_e_bytes, self->bytelen_q, self->v_e);
    assert(rbn!=NULL);

    /* a~ := g^z * h^e~ */
    ret = BN_mod_exp(self->gz, self->g, self->z, self->p, self->bnctx);
    assert(ret==1);
    ret = BN_mod_exp(self->he, self->h, self->v_e, self->p, self->bnctx);
    assert(ret==1);
    ret = BN_mod_mul(self->v_a, self->gz, self->he, self->p, self->bnctx);
    assert(ret==1);

    /* a_bytes~ := bytes(a~) */
    BN2LenBin(self->v_a, self->v_am_bytes, self->bytelen_p);

    /* h2m~ := H2(a_bytes~ || h1~) */
    memcpy(&self->v_am_bytes[self->bytelen_p], self->n, self->bytelen_red);
    VHash(self->v_am_bytes, self->bytelen_p+self->bytelen_red, self->v_mh2, self->bytelen_rec);
    
    /* msg~ := mh2~ xor h2 */
    BinXor(self->v_mh2, &self->n[self->bytelen_red], self->v_mh2, self->bytelen_rec);

    /* h1~ := H1(a_bytes~||msg~) */
    memcpy(&self->v_am_bytes[self->bytelen_p], self->v_mh2, self->bytelen_rec);
    VHash(self->v_am_bytes, self->bytelen_p+self->bytelen_rec, self->v_h1, self->bytelen_red);

    /* Check if h1~ == h1 */
    ret = memcmp(self->v_h1, self->n, self->bytelen_red);
    assert(ret==0);

    return 0;
}
开发者ID:gammasignatures，项目名称:mrsignatures，代码行数:43，代码来源:AO.c


示例7: PSPAKE_compute_key

/* key = (y_ * (h^(-1))^secret) ^ r */
void PSPAKE_compute_key(PSPAKE_CTX *ctx)
{
    BIGNUM *t1 = BN_new();
    BIGNUM *t2 = BN_new();
    BIGNUM *inv_h = BN_new();

    /* inv_h = h ^ (-1) */
    BN_mod_inverse(inv_h, ctx->h, ctx->q, ctx->ctx);

    /* t1 = inv_h ^ secret */
    BN_mod_exp(t1, inv_h, ctx->secret, ctx->q, ctx->ctx);

    /* t2 = y_ * t1 */
    BN_mod_mul(t2, ctx->y_, t1, ctx->q, ctx->ctx);

    /* key = t2 ^ r */
    ctx->key = BN_new();
    BN_mod_exp(ctx->key, t2, ctx->r, ctx->q, ctx->ctx);
}
开发者ID:qzhouayi，项目名称:New_graduation_thesis，代码行数:20，代码来源:pspake.c


示例8: InitCTX

/*const*/ BIGNUM *Bank::SignRequest(PublicCoinRequest &req)
    {
    InitCTX();

    BIGNUM *BtoA=BN_new();
    BN_mod_exp(BtoA,req.Request(),priv_key(),p(),m_ctx);
    DumpNumber("B->A=     ",BtoA);

    return BtoA;
    }
开发者ID:1974kpkpkp，项目名称:Open-Transactions，代码行数:10，代码来源:bankimp.cpp


示例9: ssl_mod_exp

int APP_CC
ssl_mod_exp(char* out, int out_len, char* in, int in_len,
            char* mod, int mod_len, char* exp, int exp_len)
{
  BN_CTX* ctx;
  BIGNUM lmod;
  BIGNUM lexp;
  BIGNUM lin;
  BIGNUM lout;
  int rv;
  char* l_out;
  char* l_in;
  char* l_mod;
  char* l_exp;

  l_out = (char*)g_malloc(out_len, 1);
  l_in = (char*)g_malloc(in_len, 1);
  l_mod = (char*)g_malloc(mod_len, 1);
  l_exp = (char*)g_malloc(exp_len, 1);
  g_memcpy(l_in, in, in_len);
  g_memcpy(l_mod, mod, mod_len);
  g_memcpy(l_exp, exp, exp_len);
  ssl_reverse_it(l_in, in_len);
  ssl_reverse_it(l_mod, mod_len);
  ssl_reverse_it(l_exp, exp_len);
  ctx = BN_CTX_new();
  BN_init(&lmod);
  BN_init(&lexp);
  BN_init(&lin);
  BN_init(&lout);
  BN_bin2bn((tui8*)l_mod, mod_len, &lmod);
  BN_bin2bn((tui8*)l_exp, exp_len, &lexp);
  BN_bin2bn((tui8*)l_in, in_len, &lin);
  BN_mod_exp(&lout, &lin, &lexp, &lmod, ctx);
  rv = BN_bn2bin(&lout, (tui8*)l_out);
  if (rv <= out_len)
  {
    ssl_reverse_it(l_out, rv);
    g_memcpy(out, l_out, out_len);
  }
  else
  {
    rv = 0;
  }
  BN_free(&lin);
  BN_free(&lout);
  BN_free(&lexp);
  BN_free(&lmod);
  BN_CTX_free(ctx);
  g_free(l_out);
  g_free(l_in);
  g_free(l_mod);
  g_free(l_exp);
  return rv;
}
开发者ID:ArvidNorr，项目名称:xrdp，代码行数:55，代码来源:ssl_calls.c


示例10: sendstep1_substep

static void sendstep1_substep(JPakeStep1 * s1, const BIGNUM *x,
                              const JPakeUser * us,
                              const JPakeParameters * params, int n)
{
    s1->gx = BN_new();
    BN_mod_exp(s1->gx, params->g, x, params->p, params->ctx);
    printf("  g^{x%d}", n);
    showbn("", s1->gx);

    CreateZKP(&s1->zkpx, x, us, params->g, params, n, "");
}
开发者ID:GrayKing，项目名称:Leakfix-on-OpenSSL，代码行数:11，代码来源:jpakedemo.c


示例11: BN_CTX_new

BigNumber BigNumber::modExp(const BigNumber &bn1, const BigNumber &bn2)
{
	BigNumber ret;
	BN_CTX *bnctx;

	bnctx = BN_CTX_new();
	BN_mod_exp(ret.m_bn, m_bn, bn1.m_bn, bn2.m_bn, bnctx);
	BN_CTX_free(bnctx);

	return ret;
}
开发者ID:arkanoid1，项目名称:BNetHook，代码行数:11，代码来源:BigNumber.cpp


示例12: VerifyZKP

static int VerifyZKP(const JPakeZKP * zkp, BIGNUM *gx,
                     const JPakeUserPublic * them, const BIGNUM *zkpg,
                     const JPakeParameters * params, int n,
                     const char *suffix)
{
    BIGNUM *h = BN_new();
    BIGNUM *t1 = BN_new();
    BIGNUM *t2 = BN_new();
    BIGNUM *t3 = BN_new();
    int ret = 0;

    zkpHash(h, zkp, gx, them, params);

    // t1 = g^b
    BN_mod_exp(t1, zkpg, zkp->b, params->p, params->ctx);
    // t2 = (g^x)^h = g^{hx}
    BN_mod_exp(t2, gx, h, params->p, params->ctx);
    // t3 = t1 * t2 = g^{hx} * g^b = g^{hx+b} = g^r (allegedly)
    BN_mod_mul(t3, t1, t2, params->p, params->ctx);

    printf("  ZKP(x%d%s)\n", n, suffix);
    showbn("    zkpg", zkpg);
    showbn("    g^r'", t3);

    // verify t3 == g^r
    if (BN_cmp(t3, zkp->gr) == 0)
        ret = 1;

    // cleanup
    BN_free(t3);
    BN_free(t2);
    BN_free(t1);
    BN_free(h);

    if (ret)
        puts("    OK");
    else
        puts("    FAIL");

    return ret;
}
开发者ID:GrayKing，项目名称:Leakfix-on-OpenSSL，代码行数:41，代码来源:jpakedemo.c


示例13: FermatProbablePrimalityTest

// Check Fermat probable primality test (2-PRP): 2 ** (n-1) = 1 (mod n)
// true: n is probable prime
// false: n is composite; set fractional length in the nLength output
static bool FermatProbablePrimalityTest(const CBigNum& n, unsigned int& nLength) {
   //CBigNum a = 2; // base; Fermat witness
   CBigNum e = n - 1;CBigNum r;
   BN_mod_exp(&r, &bnTwo, &e, &n, pctx);
   if (r == 1) { return true; }
   // Failed Fermat test, calculate fractional length
   unsigned int nFractionalLength = (((n-r) << nFractionalBits) / n).getuint();
   if (nFractionalLength >= (1 << nFractionalBits))
      return error("FermatProbablePrimalityTest() : fractional assert");
   nLength = (nLength & TARGET_LENGTH_MASK) | nFractionalLength;
   return false;
}
开发者ID:AeroCloud，项目名称:jhPrimeminer-Aero，代码行数:15，代码来源:prime.cpp


示例14: ProductEvidence_Verify

bool ProductEvidence_Verify(const_ProductEvidence ev, const_ProductStatement st)
{
  const BIGNUM* g = IntegerGroup_GetG(st->group);
  const BIGNUM* h = IntegerGroup_GetH(st->group);
  const BIGNUM* p = IntegerGroup_GetP(st->group);
  BN_CTX* ctx = IntegerGroup_GetCtx(st->group);
  BIGNUM *tmp = BN_new();

  // Recompute commitments
  // m1' = (g^z h^w1) / A^c
  BIGNUM* m1 = IntegerGroup_CascadeExponentiate(st->group, g, ev->z, h, ev->w1);
  CHECK_CALL(m1);
  CHECK_CALL(BN_copy(tmp, st->commit_a));
  CHECK_CALL(BN_mod_exp(tmp, tmp, ev->c, p, ctx));
  CHECK_CALL(BN_mod_inverse(tmp, tmp, p, ctx));
  CHECK_CALL(BN_mod_mul(m1, m1, tmp, p, ctx));

  // m2' = (B^z h^w2) / C^c
  BIGNUM* m2 = IntegerGroup_CascadeExponentiate(st->group, st->commit_b, ev->z, h, ev->w2);
  CHECK_CALL(m2);
  CHECK_CALL(BN_copy(tmp, st->commit_c));
  CHECK_CALL(BN_mod_exp(tmp, tmp, ev->c, p, ctx));
  CHECK_CALL(BN_mod_inverse(tmp, tmp, p, ctx));
  CHECK_CALL(BN_mod_mul(m2, m2, tmp, p, ctx));

  BN_clear_free(tmp);

  // Check challenge 
  // c =? H(g, h, q, p, A, B, C, m1', m2')
  BIGNUM *c_prime = Commit(st, m1, m2);

  BN_free(m1);
  BN_free(m2);

  bool retval = !BN_cmp(ev->c, c_prime);

  BN_clear_free(c_prime);

  return retval;
}
开发者ID:henrycg，项目名称:earand，代码行数:40，代码来源:product_proof.c


示例15: crypto_rsa_common

static int crypto_rsa_common(const BYTE* input, int length, UINT32 key_length, const BYTE* modulus, const BYTE* exponent, int exponent_size, BYTE* output)
{
	BN_CTX* ctx;
	int output_length = -1;
	BYTE* input_reverse;
	BYTE* modulus_reverse;
	BYTE* exponent_reverse;
	BIGNUM mod, exp, x, y;

	input_reverse = (BYTE*) malloc(2 * key_length + exponent_size);
	if (!input_reverse)
		return -1;
	modulus_reverse = input_reverse + key_length;
	exponent_reverse = modulus_reverse + key_length;

	memcpy(modulus_reverse, modulus, key_length);
	crypto_reverse(modulus_reverse, key_length);
	memcpy(exponent_reverse, exponent, exponent_size);
	crypto_reverse(exponent_reverse, exponent_size);
	memcpy(input_reverse, input, length);
	crypto_reverse(input_reverse, length);

	ctx = BN_CTX_new();
	if (!ctx)
		goto out_free_input_reverse;
	BN_init(&mod);
	BN_init(&exp);
	BN_init(&x);
	BN_init(&y);

	BN_bin2bn(modulus_reverse, key_length, &mod);
	BN_bin2bn(exponent_reverse, exponent_size, &exp);
	BN_bin2bn(input_reverse, length, &x);
	BN_mod_exp(&y, &x, &exp, &mod, ctx);

	output_length = BN_bn2bin(&y, output);
	crypto_reverse(output, output_length);

	if (output_length < (int) key_length)
		memset(output + output_length, 0, key_length - output_length);

	BN_free(&y);
	BN_clear_free(&x);
	BN_free(&exp);
	BN_free(&mod);
	BN_CTX_free(ctx);

out_free_input_reverse:
	free(input_reverse);

	return output_length;
}
开发者ID:10084462，项目名称:FreeRDP，代码行数:52，代码来源:crypto.c


示例16: DSA_SIG_new

/*
 * Computes signature and returns it as DSA_SIG structure
 */
DSA_SIG *gost_do_sign (const unsigned char *dgst, int dlen, DSA * dsa)
{
    BIGNUM *k = NULL, *tmp = NULL, *tmp2 = NULL;

    DSA_SIG *newsig = DSA_SIG_new ();

    BIGNUM *md = hashsum2bn (dgst);

    /* check if H(M) mod q is zero */
    BN_CTX *ctx = BN_CTX_new ();

    BN_CTX_start (ctx);
    if (!newsig)
    {
        GOSTerr (GOST_F_GOST_DO_SIGN, GOST_R_NO_MEMORY);
        goto err;
    }
    tmp = BN_CTX_get (ctx);
    k = BN_CTX_get (ctx);
    tmp2 = BN_CTX_get (ctx);
    BN_mod (tmp, md, dsa->q, ctx);
    if (BN_is_zero (tmp))
    {
        BN_one (md);
    }
    do
    {
        do
        {
            /*Generate random number k less than q */
            BN_rand_range (k, dsa->q);
            /* generate r = (a^x mod p) mod q */
            BN_mod_exp (tmp, dsa->g, k, dsa->p, ctx);
            if (!(newsig->r))
                newsig->r = BN_new ();
            BN_mod (newsig->r, tmp, dsa->q, ctx);
        }
        while (BN_is_zero (newsig->r));
        /* generate s = (xr + k(Hm)) mod q */
        BN_mod_mul (tmp, dsa->priv_key, newsig->r, dsa->q, ctx);
        BN_mod_mul (tmp2, k, md, dsa->q, ctx);
        if (!newsig->s)
            newsig->s = BN_new ();
        BN_mod_add (newsig->s, tmp, tmp2, dsa->q, ctx);
    }
    while (BN_is_zero (newsig->s));
  err:
    BN_free (md);
    BN_CTX_end (ctx);
    BN_CTX_free (ctx);
    return newsig;
}
开发者ID:274914765，项目名称:C，代码行数:55，代码来源:gost_sign.c


示例17: CreateZKP

// Prove knowledge of x
// Note that we don't send g^x because, as it happens, we've always
// sent it elsewhere. Also note that because of that, we could avoid
// calculating it here, but we don't, for clarity...
static void CreateZKP(JPakeZKP * zkp, const BIGNUM *x, const JPakeUser * us,
                      const BIGNUM *zkpg, const JPakeParameters * params,
                      int n, const char *suffix)
{
    BIGNUM *r = BN_new();
    BIGNUM *gx = BN_new();
    BIGNUM *h = BN_new();
    BIGNUM *t = BN_new();

    // r in [0,q)
    // XXX: Java chooses r in [0, 2^160) - i.e. distribution not uniform
    BN_rand_range(r, params->q);
    // g^r
    zkp->gr = BN_new();
    BN_mod_exp(zkp->gr, zkpg, r, params->p, params->ctx);
    // g^x
    BN_mod_exp(gx, zkpg, x, params->p, params->ctx);

    // h=hash...
    zkpHash(h, zkp, gx, &us->p, params);

    // b = r - x*h
    BN_mod_mul(t, x, h, params->q, params->ctx);
    zkp->b = BN_new();
    BN_mod_sub(zkp->b, r, t, params->q, params->ctx);

    // show
    printf("  ZKP(x%d%s)\n", n, suffix);
    showbn("   zkpg", zkpg);
    showbn("    g^x", gx);
    showbn("    g^r", zkp->gr);
    showbn("      b", zkp->b);

    // cleanup
    BN_free(t);
    BN_free(h);
    BN_free(gx);
    BN_free(r);
}
开发者ID:GrayKing，项目名称:Leakfix-on-OpenSSL，代码行数:43，代码来源:jpakedemo.c


示例18: meteor_user_generate_kgx

void meteor_user_generate_kgx(SRPUser *usr,
                              BN_CTX *ctx,
                              BIGNUM *x,
                              BIGNUM *k,
                              BIGNUM **kgx) {
    BN_CTX *lctx = BN_CTX_new();
    BIGNUM *inner_kgx = BN_new();
    BN_mod_exp(inner_kgx, usr->ng->g, x, usr->ng->N, lctx);
    BN_mul(*kgx, inner_kgx, k, lctx);
    
    BN_free(inner_kgx);
    BN_CTX_free(lctx);
}
开发者ID:TLuthra，项目名称:ObjectiveDDP，代码行数:13，代码来源:srp.c


示例19: BN_CTX_new

BIGNUM *SRP_Calc_client_key(BIGNUM *N, BIGNUM *B, BIGNUM *g, BIGNUM *x,
                            BIGNUM *a, BIGNUM *u)
{
    BIGNUM *tmp = NULL, *tmp2 = NULL, *tmp3 = NULL, *k = NULL, *K = NULL;
    BN_CTX *bn_ctx;

    if (u == NULL || B == NULL || N == NULL || g == NULL || x == NULL
        || a == NULL || (bn_ctx = BN_CTX_new()) == NULL)
        return NULL;

    if ((tmp = BN_new()) == NULL ||
        (tmp2 = BN_new()) == NULL ||
        (tmp3 = BN_new()) == NULL ||
        (K = BN_new()) == NULL)
        goto err;

    if (!BN_mod_exp(tmp, g, x, N, bn_ctx))
        goto err;
    if ((k = srp_Calc_k(N, g)) == NULL)
        goto err;
    if (!BN_mod_mul(tmp2, tmp, k, N, bn_ctx))
        goto err;
    if (!BN_mod_sub(tmp, B, tmp2, N, bn_ctx))
        goto err;
    if (!BN_mod_mul(tmp3, u, x, N, bn_ctx))
        goto err;
    if (!BN_mod_add(tmp2, a, tmp3, N, bn_ctx))
        goto err;
    if (!BN_mod_exp(K, tmp, tmp2, N, bn_ctx))
        goto err;

 err:
    BN_CTX_free(bn_ctx);
    BN_clear_free(tmp);
    BN_clear_free(tmp2);
    BN_clear_free(tmp3);
    BN_free(k);
    return K;
}
开发者ID:AndreV84，项目名称:openssl，代码行数:39，代码来源:srp_lib.c


示例20: pollard_pminus1

/* pollard p-1, algorithm from Jim Gillogly, May 2000 */
static void
pollard_pminus1(BIGNUM *val)
{
	BIGNUM *base, *rbase, *num, *i, *x;

	base = BN_new();
	rbase = BN_new();
	num = BN_new();
	i = BN_new();
	x = BN_new();

	BN_set_word(rbase, 1);
newbase:
	if (!BN_add_word(rbase, 1))
		errx(1, "error in BN_add_word()");
	BN_set_word(i, 2);
	BN_copy(base, rbase);

	for (;;) {
		BN_mod_exp(base, base, i, val, ctx);
		if (BN_is_one(base))
			goto newbase;

		BN_copy(x, base);
		BN_sub_word(x, 1);
		if (!BN_gcd(x, x, val, ctx))
			errx(1, "error in BN_gcd()");

		if (!BN_is_one(x)) {
			if (BN_is_prime(x, PRIME_CHECKS, NULL, NULL,
			    NULL) == 1)
				pr_print(x);
			else
				pollard_pminus1(x);
			fflush(stdout);

			BN_div(num, NULL, val, x, ctx);
			if (BN_is_one(num))
				return;
			if (BN_is_prime(num, PRIME_CHECKS, NULL, NULL,
			    NULL) == 1) {
				pr_print(num);
				fflush(stdout);
				return;
			}
			BN_copy(val, num);
		}
		if (!BN_add_word(i, 1))
			errx(1, "error in BN_add_word()");
	}
}
开发者ID:edgar-pek，项目名称:PerspicuOS，代码行数:52，代码来源:factor.c



注：本文中的BN_mod_exp函数示例整理自Github/MSDocs等源码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。

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C++ BN_mod_exp_mont函数代码示例发布时间：2022-05-30
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