class OpenSSL::BN

Public Class Methods

generate_prime(bits, [, safe [, add [, rem]]]) → bn click to toggle source

Generates a random prime number of bit length bits. If safe is true, generates a safe prime. If add is specified, generates a prime that fulfills condition p % add = rem.

Parameters ↑

  • bits - integer

  • safe - boolean

  • add - BN

  • rem - BN

static VALUE
ossl_bn_s_generate_prime(int argc, VALUE *argv, VALUE klass)
{
    BIGNUM *add = NULL, *rem = NULL, *result;
    int safe = 1, num;
    VALUE vnum, vsafe, vadd, vrem, obj;

    rb_scan_args(argc, argv, "13", &vnum, &vsafe, &vadd, &vrem);

    num = NUM2INT(vnum);

    if (vsafe == Qfalse) {
        safe = 0;
    }
    if (!NIL_P(vadd)) {
        add = GetBNPtr(vadd);
        rem = NIL_P(vrem) ? NULL : GetBNPtr(vrem);
    }
    obj = NewBN(klass);
    if (!(result = BN_new())) {
        ossl_raise(eBNError, NULL);
    }
    if (!BN_generate_prime_ex(result, num, safe, add, rem, NULL)) {
        BN_free(result);
        ossl_raise(eBNError, NULL);
    }
    SetBN(obj, result);

    return obj;
}
OpenSSL::BN.new → aBN click to toggle source
OpenSSL::BN.new(bn) → aBN
OpenSSL::BN.new(integer) → aBN
OpenSSL::BN.new(string) → aBN
OpenSSL::BN.new(string, 0 | 2 | 10 | 16) → aBN

Construct a new OpenSSL BigNum object.

static VALUE
ossl_bn_initialize(int argc, VALUE *argv, VALUE self)
{
    BIGNUM *bn;
    VALUE str, bs;
    int base = 10;

    if (rb_scan_args(argc, argv, "11", &str, &bs) == 2) {
        base = NUM2INT(bs);
    }

    if (RB_INTEGER_TYPE_P(str)) {
        GetBN(self, bn);
        integer_to_bnptr(str, bn);

        return self;
    }

    if (RTEST(rb_obj_is_kind_of(str, cBN))) {
        BIGNUM *other;

        GetBN(self, bn);
        GetBN(str, other); /* Safe - we checked kind_of? above */
        if (!BN_copy(bn, other)) {
            ossl_raise(eBNError, NULL);
        }
        return self;
    }

    GetBN(self, bn);
    switch (base) {
    case 0:
        if (!BN_mpi2bn((unsigned char *)StringValuePtr(str), RSTRING_LENINT(str), bn)) {
            ossl_raise(eBNError, NULL);
        }
        break;
    case 2:
        if (!BN_bin2bn((unsigned char *)StringValuePtr(str), RSTRING_LENINT(str), bn)) {
            ossl_raise(eBNError, NULL);
        }
        break;
    case 10:
        if (!BN_dec2bn(&bn, StringValueCStr(str))) {
            ossl_raise(eBNError, NULL);
        }
        break;
    case 16:
        if (!BN_hex2bn(&bn, StringValueCStr(str))) {
            ossl_raise(eBNError, NULL);
        }
        break;
    default:
        ossl_raise(rb_eArgError, "invalid radix %d", base);
    }
    return self;
}

Public Instance Methods

bn % bn2 → aBN
bn * bn2 → aBN
bn ** bn2 → aBN
bn + bn2 → aBN
bn - bn2 → aBN
bn1 / bn2 → [result, remainder] click to toggle source

Division of OpenSSL::BN instances

static VALUE
ossl_bn_div(VALUE self, VALUE other)
{
    BIGNUM *bn1, *bn2 = GetBNPtr(other), *r1, *r2;
    VALUE klass, obj1, obj2;

    GetBN(self, bn1);

    klass = rb_obj_class(self);
    obj1 = NewBN(klass);
    obj2 = NewBN(klass);
    if (!(r1 = BN_new())) {
        ossl_raise(eBNError, NULL);
    }
    if (!(r2 = BN_new())) {
        BN_free(r1);
        ossl_raise(eBNError, NULL);
    }
    if (!BN_div(r1, r2, bn1, bn2, ossl_bn_ctx)) {
        BN_free(r1);
        BN_free(r2);
        ossl_raise(eBNError, NULL);
    }
    SetBN(obj1, r1);
    SetBN(obj2, r2);

    return rb_ary_new3(2, obj1, obj2);
}
bn << bits → aBN
<=>(p1)
Alias for: cmp
bn == obj → true or false click to toggle source

Returns true only if obj has the same value as bn. Contrast this with OpenSSL::BN#eql?, which requires obj to be OpenSSL::BN.

static VALUE
ossl_bn_eq(VALUE self, VALUE other)
{
    BIGNUM *bn1, *bn2;

    GetBN(self, bn1);
    other = try_convert_to_bn(other);
    if (NIL_P(other))
        return Qfalse;
    GetBN(other, bn2);

    if (!BN_cmp(bn1, bn2)) {
        return Qtrue;
    }
    return Qfalse;
}
Also aliased as: ===
===(p1)
Alias for: ==
bn >> bits → aBN
bit_set?(bit) → true | false click to toggle source

Returns boolean of whether bit is set. Bitwise operations for openssl BIGNUMs.

static VALUE
ossl_bn_is_bit_set(VALUE self, VALUE bit)
{
    int b;
    BIGNUM *bn;

    b = NUM2INT(bit);
    GetBN(self, bn);
    if (BN_is_bit_set(bn, b)) {
        return Qtrue;
    }
    return Qfalse;
}
clear_bit!(bit) → self
cmp(bn2) → integer
Also aliased as: <=>
coerce(p1) click to toggle source 
static VALUE
ossl_bn_coerce(VALUE self, VALUE other)
{
    switch(TYPE(other)) {
    case T_STRING:
        self = ossl_bn_to_s(0, NULL, self);
        break;
    case T_FIXNUM:
    case T_BIGNUM:
        self = ossl_bn_to_i(self);
        break;
    default:
        if (!RTEST(rb_obj_is_kind_of(other, cBN))) {
            ossl_raise(rb_eTypeError, "Don't know how to coerce");
        }
    }
    return rb_assoc_new(other, self);
}
copy(p1) click to toggle source 
static VALUE
ossl_bn_copy(VALUE self, VALUE other)
{
    BIGNUM *bn1, *bn2;

    rb_check_frozen(self);

    if (self == other) return self;

    GetBN(self, bn1);
    bn2 = GetBNPtr(other);

    if (!BN_copy(bn1, bn2)) {
        ossl_raise(eBNError, NULL);
    }
    return self;
}
eql?(obj) → true or false click to toggle source

Returns true only if obj is a OpenSSL::BN with the same value as big. Contrast this with OpenSSL::BN#==, which performs type conversions.

static VALUE
ossl_bn_eql(VALUE self, VALUE other)
{
    BIGNUM *bn1, *bn2;

    if (!rb_obj_is_kind_of(other, cBN))
        return Qfalse;
    GetBN(self, bn1);
    GetBN(other, bn2);

    return BN_cmp(bn1, bn2) ? Qfalse : Qtrue;
}
gcd(bn2) → aBN
hash → Integer click to toggle source

Returns a hash code for this object.

See also Object#hash.

static VALUE
ossl_bn_hash(VALUE self)
{
    BIGNUM *bn;
    VALUE hash;
    unsigned char *buf;
    int len;

    GetBN(self, bn);
    len = BN_num_bytes(bn);
    buf = xmalloc(len);
    if (BN_bn2bin(bn, buf) != len) {
        xfree(buf);
        ossl_raise(eBNError, NULL);
    }

    hash = ST2FIX(rb_memhash(buf, len));
    xfree(buf);

    return hash;
}
lshift!(bits) → self
mod_add(bn1, bn2) → aBN
mod_exp(bn1, bn2) → aBN
mod_inverse(bn2) → aBN
mod_mul(bn1, bn2) → aBN
mod_sqr(bn2) → aBN
mod_sub(bn1, bn2) → aBN
num_bits → integer
num_bytes → integer
odd? → true | false
one? → true | false
pretty_print(q) click to toggle source 
# File ext/openssl/lib/openssl/bn.rb, line 20
def pretty_print(q)
  q.object_group(self) {
    q.text ' '
    q.text to_i.to_s
  }
end
prime? → true | false click to toggle source
prime?(checks) → true | false

Performs a Miller-Rabin probabilistic primality test with checks iterations. If nchecks is not specified, a number of iterations is used that yields a false positive rate of at most 2^-80 for random input.

Parameters ↑

  • checks - integer

static VALUE
ossl_bn_is_prime(int argc, VALUE *argv, VALUE self)
{
    BIGNUM *bn;
    VALUE vchecks;
    int checks = BN_prime_checks;

    if (rb_scan_args(argc, argv, "01", &vchecks) == 1) {
        checks = NUM2INT(vchecks);
    }
    GetBN(self, bn);
    switch (BN_is_prime_ex(bn, checks, ossl_bn_ctx, NULL)) {
    case 1:
        return Qtrue;
    case 0:
        return Qfalse;
    default:
        ossl_raise(eBNError, NULL);
    }
    /* not reachable */
    return Qnil;
}
prime_fasttest? → true | false click to toggle source
prime_fasttest?(checks) → true | false
prime_fasttest?(checks, trial_div) → true | false

Performs a Miller-Rabin primality test. This is same as prime? except this first attempts trial divisions with some small primes.

Parameters ↑

  • checks - integer

  • trial_div - boolean

static VALUE
ossl_bn_is_prime_fasttest(int argc, VALUE *argv, VALUE self)
{
    BIGNUM *bn;
    VALUE vchecks, vtrivdiv;
    int checks = BN_prime_checks, do_trial_division = 1;

    rb_scan_args(argc, argv, "02", &vchecks, &vtrivdiv);

    if (!NIL_P(vchecks)) {
        checks = NUM2INT(vchecks);
    }
    GetBN(self, bn);
    /* handle true/false */
    if (vtrivdiv == Qfalse) {
        do_trial_division = 0;
    }
    switch (BN_is_prime_fasttest_ex(bn, checks, ossl_bn_ctx, do_trial_division, NULL)) {
    case 1:
        return Qtrue;
    case 0:
        return Qfalse;
    default:
        ossl_raise(eBNError, NULL);
    }
    /* not reachable */
    return Qnil;
}
rshift!(bits) → self
set_bit!(bit) → self
sqr → aBN
to_bn() click to toggle source 
static VALUE
ossl_bn_to_bn(VALUE self)
{
    return self;
}
to_i → integer click to toggle source 
static VALUE
ossl_bn_to_i(VALUE self)
{
    BIGNUM *bn;
    char *txt;
    VALUE num;

    GetBN(self, bn);

    if (!(txt = BN_bn2hex(bn))) {
        ossl_raise(eBNError, NULL);
    }
    num = rb_cstr_to_inum(txt, 16, Qtrue);
    OPENSSL_free(txt);

    return num;
}
Also aliased as: to_int
to_int()
Alias for: to_i
to_s → string click to toggle source
to_s(base) → string

Parameters ↑

  • base - integer Valid values:

    • 0 - MPI

    • 2 - binary

    • 10 - the default

    • 16 - hex

static VALUE
ossl_bn_to_s(int argc, VALUE *argv, VALUE self)
{
    BIGNUM *bn;
    VALUE str, bs;
    int base = 10, len;
    char *buf;

    if (rb_scan_args(argc, argv, "01", &bs) == 1) {
        base = NUM2INT(bs);
    }
    GetBN(self, bn);
    switch (base) {
    case 0:
        len = BN_bn2mpi(bn, NULL);
        str = rb_str_new(0, len);
        if (BN_bn2mpi(bn, (unsigned char *)RSTRING_PTR(str)) != len)
            ossl_raise(eBNError, NULL);
        break;
    case 2:
        len = BN_num_bytes(bn);
        str = rb_str_new(0, len);
        if (BN_bn2bin(bn, (unsigned char *)RSTRING_PTR(str)) != len)
            ossl_raise(eBNError, NULL);
        break;
    case 10:
        if (!(buf = BN_bn2dec(bn))) ossl_raise(eBNError, NULL);
        str = ossl_buf2str(buf, rb_long2int(strlen(buf)));
        break;
    case 16:
        if (!(buf = BN_bn2hex(bn))) ossl_raise(eBNError, NULL);
        str = ossl_buf2str(buf, rb_long2int(strlen(buf)));
        break;
    default:
        ossl_raise(rb_eArgError, "invalid radix %d", base);
    }

    return str;
}
ucmp(bn2) → integer
zero? → true | false