class OpenSSL::BN

Public Class Methods

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

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);
    }
    if (!(result = BN_new())) {
        ossl_raise(eBNError, NULL);
    }
    if (!BN_generate_prime(result, num, safe, add, rem, NULL, NULL)) {
        BN_free(result);
        ossl_raise(eBNError, NULL);
    }
    WrapBN(klass, obj, result);

    return obj;
}

new → aBN click to toggle source

new(bn) → aBN

new(integer) → aBN

new(string) → aBN

new(string, 0 | 2 | 10 | 16) → aBN

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_TYPE_P(str, T_FIXNUM)) {
        long i;
        unsigned char bin[sizeof(long)];
        long n = FIX2LONG(str);
        unsigned long un = labs(n);

        for (i = sizeof(long) - 1; 0 <= i; i--) {
            bin[i] = un&0xff;
            un >>= 8;
        }

        GetBN(self, bn);
        if (!BN_bin2bn(bin, sizeof(bin), bn)) {
            ossl_raise(eBNError, NULL);
        }
        if (n < 0) BN_set_negative(bn, 1);
        return self;
    }
    else if (RB_TYPE_P(str, T_BIGNUM)) {
        int i, j, len = RBIGNUM_LENINT(str);
        BDIGIT *ds = RBIGNUM_DIGITS(str);
        VALUE buf;
        unsigned char *bin = (unsigned char*)ALLOCV_N(BDIGIT, buf, len);

        for (i = 0; len > i; i++) {
            BDIGIT v = ds[i];
            for (j = SIZEOF_BDIGITS - 1; 0 <= j; j--) {
                bin[(len-1-i)*SIZEOF_BDIGITS+j] = v&0xff;
                v >>= 8;
            }
        }

        GetBN(self, bn);
        if (!BN_bin2bn(bin, (int)SIZEOF_BDIGITS*len, bn)) {
            ALLOCV_END(buf);
            ossl_raise(eBNError, NULL);
        }
        ALLOCV_END(buf);
        if (!RBIGNUM_SIGN(str)) BN_set_negative(bn, 1);
        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;
    }

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

Public Instance Methods

bn1 / bn2 → [result, remainder] click to toggle source

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

    GetBN(self, bn1);

    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);
    }
    WrapBN(CLASS_OF(self), obj1, r1);
    WrapBN(CLASS_OF(self), obj2, r2);

    return rb_ary_new3(2, obj1, obj2);
}

==(p1)

Alias for: eql?

===(p1)

Alias for: eql?

bit_set?(bit) → true | false click to toggle source

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;
}

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?(p1) click to toggle source

static VALUE
ossl_bn_eql(VALUE self, VALUE other)
{
    if (ossl_bn_cmp(self, other) == INT2FIX(0)) {
        return Qtrue;
    }
    return Qfalse;
}

Also aliased as: ==, ===

prime? → true | false click to toggle source

prime?(checks) → true | false

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(bn, checks, NULL, 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

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(bn, checks, NULL, ossl_bn_ctx, NULL, do_trial_division)) {
    case 1:
        return Qtrue;
    case 0:
        return Qfalse;
    default:
        ossl_raise(eBNError, NULL);
    }
    /* not reachable */
    return Qnil;
}

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;
}