Class: SelfCrypto::GroupSession

Inherits:
Object
  • Object
show all
Defined in:
lib/self_crypto/group_session.rb,
ext/self_crypto/omemo.c

Instance Method Summary collapse

Constructor Details

#initialize(*args) ⇒ Object 



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# File 'ext/self_crypto/omemo.c', line 6

static VALUE initialize(int argc, VALUE *argv, VALUE self)
{
    VALUE identity;
    GroupSession *this;

    Data_Get_Struct(self, GroupSession, this);

    (void)rb_scan_args(argc, argv, "1", &identity);

    if(identity != Qnil){
        if(rb_obj_is_kind_of(identity, rb_cString) != Qtrue){
            rb_raise(rb_eTypeError, "identity must be kind of String");
        }
    }

    omemo_set_identity(this, RSTRING_PTR(identity));

    return self;
}

Instance Method Details

#add_participant(identity, session) ⇒ Object 



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# File 'ext/self_crypto/omemo.c', line 26

static VALUE add_participant(VALUE self, VALUE identity, VALUE session)
{
    GroupSession *this;
    OlmSession *s;

    Data_Get_Struct(self, GroupSession, this);
    Data_Get_Struct(session, OlmSession, s);

    if(rb_obj_is_kind_of(identity, rb_eval_string("String")) != Qtrue){
        rb_raise(rb_eTypeError, "identity must be kind of String");
    }

    if(
       rb_obj_is_instance_of(session, rb_eval_string("SelfCrypto::Session")) != Qtrue &&
       rb_obj_is_instance_of(session, rb_eval_string("SelfCrypto::InboundSession")) != Qtrue &&
       rb_obj_is_instance_of(session, rb_eval_string("SelfCrypto::OutboundSession")) != Qtrue
     ){
        rb_raise(rb_eTypeError, "session must be an instance of SelfCrypto::Session, SelfCrypto::InboundSession or SelfCrypto::OutboundSession");
    }

    omemo_add_group_participant(this, RSTRING_PTR(identity), s);

    return identity;
}

#decrypt(sender, ciphertext) ⇒ Object 



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# File 'ext/self_crypto/omemo.c', line 94

static VALUE group_decrypt(VALUE self, VALUE sender, VALUE ciphertext)
{
    GroupSession *this;
    VALUE plaintext;
    void *ptr;
    size_t plaintext_sz;

    Data_Get_Struct(self, GroupSession, this);

    if(rb_obj_is_kind_of(sender, rb_eval_string("String")) != Qtrue){
        rb_raise(rb_eTypeError, "sender must be kind of String");
    }

    if(rb_obj_is_kind_of(ciphertext, rb_eval_string("String")) != Qtrue){
        rb_raise(rb_eTypeError, "ciphertext must be kind of String");
    }

    plaintext_sz = omemo_decrypted_size(this, RSTRING_PTR(ciphertext), RSTRING_LEN(ciphertext));

    if (plaintext_sz == 0) {
        rb_raise(rb_eTypeError, "could not get size of decrypted message");
    }

    if((ptr = malloc(plaintext_sz)) == NULL){
        rb_raise(rb_eNoMemError, "%s()", __FUNCTION__);
    }

    plaintext_sz = omemo_decrypt(
        this,
        RSTRING_PTR(sender),
        ptr,
        plaintext_sz,
        RSTRING_PTR(ciphertext),
        RSTRING_LEN(ciphertext)
    );

    if(plaintext_sz == 0) {
        free(ptr);
        rb_raise(rb_eTypeError, "failed to decrypt");
    }

    plaintext = rb_str_new(ptr, plaintext_sz);

    free(ptr);

    return plaintext;
}

#encrypt(plaintext) ⇒ Object 



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# File 'ext/self_crypto/omemo.c', line 51

static VALUE group_encrypt(VALUE self, VALUE plaintext)
{
    GroupSession *this;
    VALUE ciphertext;
    void *ptr;
    size_t ciphertext_sz;

    Data_Get_Struct(self, GroupSession, this);

    if(rb_obj_is_kind_of(plaintext, rb_eval_string("String")) != Qtrue){
        rb_raise(rb_eTypeError, "plaintext must be kind of String");
    }

    ciphertext_sz = omemo_encrypted_size(this, RSTRING_LEN(plaintext));

    if (ciphertext_sz == 0) {
        rb_raise(rb_eTypeError, "could not get size of encrypted message");
    }

    if((ptr = malloc(ciphertext_sz)) == NULL){
        rb_raise(rb_eNoMemError, "%s()", __FUNCTION__);
    }

    ciphertext_sz = omemo_encrypt(
        this,
        RSTRING_PTR(plaintext),
        RSTRING_LEN(plaintext),
        ptr,
        ciphertext_sz
    );

    if(ciphertext_sz == 0) {
        free(ptr);
        rb_raise(rb_eTypeError, "failed to encrypt");
    }

    ciphertext = rb_funcall(rb_eval_string("SelfCrypto::GroupMessage"), rb_intern("new"), 1, rb_str_new(ptr, ciphertext_sz));

    free(ptr);

    return ciphertext;
}