OpenSSL::PKey::DSA

class OpenSSL::PKey::DSA

父类:OpenSSL::PKey::PKey

数字签名算法DSA在NIST的FIPS 186-3中有详细说明。这是一种非对称公钥算法，可能与RSA类似。请注意，对于1.0.0之前的OpenSSL版本，必须使用摘要算法OpenSSL :: Digest :: DSS（相当于SHA）或OpenSSL :: Digest :: DSS1（相当于SHA-1）来发布带有DSA的签名密钥使用OpenSSL :: PKey＃标志。从OpenSSL 1.0.0开始，摘要算法不再受限制，任何摘要都可以用于签名。

公共类方法

生成（大小）→dsa显示源

通过从头开始生成私钥/公钥对创建新的DSA实例。

参数

size是一个代表所需密钥大小的整数。静态值VALUE ossl_dsa_s_generate（VALUE klass，VALUE size）{DSA * dsa = dsa_generate（NUM2INT（size））; / * err由dsa_instance处理* / VALUE obj = dsa_instance（klass，dsa）; if（obj == Qfalse）{DSA_free（dsa）; ossl_raise（eDSAError，NULL）; } return obj; } new→dsa显示源新（大小）→dsa new（string，pass）→dsa通过读取string.Parameters中的现有密钥创建新的DSA实例

size 是一个表示所需密钥大小的整数。

string 包含DER或PEM编码密钥。

pass 是一个包含可选密码的字符串。

例子

DSA.new -> dsa
DSA.new(1024) -> dsa
DSA.new(File.read('dsa.pem')) -> dsa
DSA.new(File.read('dsa.pem'), 'mypassword') -> dsa

static VALUE
ossl_dsa_initialize(int argc, VALUE *argv, VALUE self)
{
    EVP_PKEY *pkey;
    DSA *dsa;
    BIO *in;
    VALUE arg, pass;

    GetPKey(self, pkey
    if(rb_scan_args(argc, argv, "02", &arg, &pass) == 0) {
        dsa = DSA_new(
    }
    else if (RB_INTEGER_TYPE_P(arg)) {
        if (!(dsa = dsa_generate(NUM2INT(arg)))) {
            ossl_raise(eDSAError, NULL
        }
    }
    else {
        pass = ossl_pem_passwd_value(pass
        arg = ossl_to_der_if_possible(arg
        in = ossl_obj2bio(arg
        dsa = PEM_read_bio_DSAPrivateKey(in, NULL, ossl_pem_passwd_cb, (void *)pass
        if (!dsa) {
            OSSL_BIO_reset(in
            dsa = PEM_read_bio_DSA_PUBKEY(in, NULL, NULL, NULL
        }
        if (!dsa) {
            OSSL_BIO_reset(in
            dsa = d2i_DSAPrivateKey_bio(in, NULL
        }
        if (!dsa) {
            OSSL_BIO_reset(in
            dsa = d2i_DSA_PUBKEY_bio(in, NULL
        }
        if (!dsa) {
            OSSL_BIO_reset(in
#define PEM_read_bio_DSAPublicKey(bp,x,cb,u) (DSA *)PEM_ASN1_read_bio( \
        (d2i_of_void *)d2i_DSAPublicKey, PEM_STRING_DSA_PUBLIC, (bp), (void **)(x), (cb), (u))
            dsa = PEM_read_bio_DSAPublicKey(in, NULL, NULL, NULL
#undef PEM_read_bio_DSAPublicKey
        }
        BIO_free(in
        if (!dsa) {
            ossl_clear_error(
            ossl_raise(eDSAError, "Neither PUB key nor PRIV key"
        }
    }
    if (!EVP_PKEY_assign_DSA(pkey, dsa)) {
        DSA_free(dsa
        ossl_raise(eDSAError, NULL
    }

    return self;
}

公共实例方法

export(cipher, password) → aString 显示源

to_pem(cipher, password) → aString

to_s(cipher, password) → aString

将此DSA编码为其PEM编码。

参数

cipher is an OpenSSL::Cipher.

password 是一个包含你的密码的字符串。

例子

DSA.to_pem -> aString
DSA.to_pem(cipher, 'mypassword') -> aString

static VALUE
ossl_dsa_export(int argc, VALUE *argv, VALUE self)
{
    DSA *dsa;
    BIO *out;
    const EVP_CIPHER *ciph = NULL;
    VALUE cipher, pass, str;

    GetDSA(self, dsa
    rb_scan_args(argc, argv, "02", &cipher, &pass
    if (!NIL_P(cipher)) {
        ciph = GetCipherPtr(cipher
        pass = ossl_pem_passwd_value(pass
    }
    if (!(out = BIO_new(BIO_s_mem()))) {
        ossl_raise(eDSAError, NULL
    }
    if (DSA_HAS_PRIVATE(dsa)) {
        if (!PEM_write_bio_DSAPrivateKey(out, dsa, ciph, NULL, 0,
                                         ossl_pem_passwd_cb, (void *)pass)){
            BIO_free(out
            ossl_raise(eDSAError, NULL
        }
    } else {
        if (!PEM_write_bio_DSA_PUBKEY(out, dsa)) {
            BIO_free(out
            ossl_raise(eDSAError, NULL
        }
    }
    str = ossl_membio2str(out

    return str;
}

另外别名为：to_pem，to_s

params→哈希显示源码

将密钥的所有参数存储到散列INSECURE：PRIVATE INFORMATIONS CAN LEAK OUT !!! 不要使用:-)）（我由你决定）

static VALUE
ossl_dsa_get_params(VALUE self)
{
    DSA *dsa;
    VALUE hash;
    const BIGNUM *p, *q, *g, *pub_key, *priv_key;

    GetDSA(self, dsa
    DSA_get0_pqg(dsa, &p, &q, &g
    DSA_get0_key(dsa, &pub_key, &priv_key

    hash = rb_hash_new(
    rb_hash_aset(hash, rb_str_new2("p"), ossl_bn_new(p)
    rb_hash_aset(hash, rb_str_new2("q"), ossl_bn_new(q)
    rb_hash_aset(hash, rb_str_new2("g"), ossl_bn_new(g)
    rb_hash_aset(hash, rb_str_new2("pub_key"), ossl_bn_new(pub_key)
    rb_hash_aset(hash, rb_str_new2("priv_key"), ossl_bn_new(priv_key)

    return hash;
}

private? → true | false 显示源

指示此DSA实例是否具有与其关联的私钥。私钥可以通过DSA＃private_key检索。

static VALUE
ossl_dsa_is_private(VALUE self)
{
    DSA *dsa;

    GetDSA(self, dsa

    return DSA_PRIVATE(self, dsa) ? Qtrue : Qfalse;
}

public? → true | false 显示源

指示此DSA实例是否具有与其关联的公钥。公钥可以用#public_key检索。

static VALUE
ossl_dsa_is_public(VALUE self)
{
    DSA *dsa;
    const BIGNUM *bn;

    GetDSA(self, dsa
    DSA_get0_key(dsa, &bn, NULL

    return bn ? Qtrue : Qfalse;
}

public_key → aDSA 显示源

返回仅携带公钥信息的新DSA实例。如果当前实例也有私钥信息，则新实例中将不再存在。此功能有助于发布公钥信息而不泄漏任何私人信息。

例

dsa = OpenSSL::PKey::DSA.new(2048) # has public and private information
pub_key = dsa.public_key # has only the public part available
pub_key_der = pub_key.to_der # it's safe to publish this

static VALUE
ossl_dsa_to_public_key(VALUE self)
{
    EVP_PKEY *pkey;
    DSA *dsa;
    VALUE obj;

    GetPKeyDSA(self, pkey
    /* err check performed by dsa_instance */
#define DSAPublicKey_dup(dsa) (DSA *)ASN1_dup( \
        (i2d_of_void *)i2d_DSAPublicKey, (d2i_of_void *)d2i_DSAPublicKey, (char *)(dsa))
    dsa = DSAPublicKey_dup(EVP_PKEY_get0_DSA(pkey)
#undef DSAPublicKey_dup
    obj = dsa_instance(rb_obj_class(self), dsa
    if (obj == Qfalse) {
        DSA_free(dsa
        ossl_raise(eDSAError, NULL
    }
    return obj;
}

set_key(pub_key, priv_key) → self

设置pub_key和priv_keyDSA实例。priv_key可能是零。

set_pqg(p, q, g) → self

套p，q，g为DSA实例。

syssign(string) → aString Show source

计算并返回DSA签名string，其中string预期是原始输入数据的已经计算的消息摘要。签名是使用此DSA实例的私钥发布的。

参数

string是要被签名的原始输入数据的消息摘要.Exampledsa = OpenSSL :: PKey :: DSA.new（2048）doc =“Sign me”digest = OpenSSL :: Digest :: SHA1.digest（doc）sig = dsa.syssign （摘要）静态VALUE ossl_dsa_sign（VALUE self，VALUE data）{DSA * dsa; const BIGNUM * dsa_q; unsigned int buf_len; VALUE str; GetDSA（self，dsa）; DSA_get0_pqg（dsa，NULL，＆dsa_q，NULL）; 如果（！dsa_q）ossl_raise（eDSAError，“incomplete DSA”）; 如果（！DSA_PRIVATE（self，dsa））ossl_raise（eDSAError，“Private DSA key needed！”）; 的StringValue（数据）; str = rb_str_new（0，DSA_size（dsa））; if（！DSA_sign（0，（unsigned char *）RSTRING_PTR（data），RSTRING_LENINT（data），（unsigned char *）RSTRING_PTR（str），＆buf_len）dsa））{/ *类型被忽略（0）* / ossl_raise（eDSAError，NULL）; } rb_str_set_len（str，buf_len）; 返回str; } sysverify（digest，sig）→true | false显示源根据消息摘要输入验证签名是否有效。它通过验证来实现sig 使用此DSA实例的公钥。参数

digest 是要签名的原始输入数据的消息摘要

sig 是DSA签名值

例

dsa = OpenSSL::PKey::DSA.new(2048)
doc = "Sign me"
digest = OpenSSL::Digest::SHA1.digest(doc)
sig = dsa.syssign(digest)
puts dsa.sysverify(digest, sig) # => true

static VALUE
ossl_dsa_verify(VALUE self, VALUE digest, VALUE sig)
{
    DSA *dsa;
    int ret;

    GetDSA(self, dsa
    StringValue(digest
    StringValue(sig
    /* type is ignored (0) */
    ret = DSA_verify(0, (unsigned char *)RSTRING_PTR(digest), RSTRING_LENINT(digest),
                     (unsigned char *)RSTRING_PTR(sig), RSTRING_LENINT(sig), dsa
    if (ret < 0) {
        ossl_raise(eDSAError, NULL
    }
    else if (ret == 1) {
        return Qtrue;
    }

    return Qfalse;
}

to_der → aString 显示源

将此DSA编码为其DER编码。

static VALUE
ossl_dsa_to_der(VALUE self)
{
    DSA *dsa;
    int (*i2d_func)(DSA *, unsigned char **
    unsigned char *p;
    long len;
    VALUE str;

    GetDSA(self, dsa
    if(DSA_HAS_PRIVATE(dsa))
        i2d_func = (int (*)(DSA *,unsigned char **))i2d_DSAPrivateKey;
    else
        i2d_func = i2d_DSA_PUBKEY;
    if((len = i2d_func(dsa, NULL)) <= 0)
        ossl_raise(eDSAError, NULL
    str = rb_str_new(0, len
    p = (unsigned char *)RSTRING_PTR(str
    if(i2d_func(dsa, &p) < 0)
        ossl_raise(eDSAError, NULL
    ossl_str_adjust(str, p

    return str;
}

to_pem(p1 = v1, p2 = v2)

别名为：导出

to_s(p1 = v1, p2 = v2)

别名为：导出

to_text→aString显示源文件

打印缓冲区的所有参数键INSECURE：私人信息可以泄漏！不要使用:-)）（我由你决定）

static VALUE
ossl_dsa_to_text(VALUE self)
{
    DSA *dsa;
    BIO *out;
    VALUE str;

    GetDSA(self, dsa
    if (!(out = BIO_new(BIO_s_mem()))) {
        ossl_raise(eDSAError, NULL
    }
    if (!DSA_print(out, dsa, 0)) { /* offset = 0 */
        BIO_free(out
        ossl_raise(eDSAError, NULL
    }
    str = ossl_membio2str(out

    return str;
}