Class: SelfCrypto::PK::Decryption

Inherits:
Data
  • Object
show all
Defined in:
ext/self_crypto/pk_decryption.c

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*args) ⇒ Object 



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# File 'ext/self_crypto/pk_decryption.c', line 33

static VALUE initialize(int argc, VALUE *argv, VALUE self) {
    OlmPkDecryption *this;
    size_t publicKeyLen;
    char *publicKeyPtr;
    VALUE privateKey;
    TypedData_Get_Struct(self, OlmPkDecryption, &olm_pk_decryption_type, this);

    rb_scan_args(argc, argv, "01", &privateKey);

    if (NIL_P(privateKey)) {
        privateKey = get_random(olm_pk_private_key_length());
    } else {
        Check_Type(privateKey, T_STRING);
        if (RSTRING_LEN(privateKey) != olm_pk_private_key_length()) {
            rb_raise(rb_eval_string("ArgumentError"), "private_key has wrong size (must be %lu)", olm_pk_private_key_length());
        }
    }

    publicKeyLen = olm_pk_key_length();
    publicKeyPtr = malloc_or_raise(publicKeyLen);

    if (olm_pk_key_from_private(this,
            publicKeyPtr, publicKeyLen,
            RSTRING_PTR(privateKey), RSTRING_LEN(privateKey)) == olm_error()) {
        free(publicKeyPtr);
        raise_olm_error(olm_pk_decryption_last_error(this));
    }

    rb_iv_set(self, "@public_key", rb_str_new(publicKeyPtr, publicKeyLen));
    free(publicKeyPtr);

    return self;
}

Instance Attribute Details

#public_key ⇒ Object (readonly)

Instance Method Details

#decrypt(pkMessage) ⇒ Object 



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# File 'ext/self_crypto/pk_decryption.c', line 67

static VALUE pk_decrypt(VALUE self, VALUE pkMessage) {
    OlmPkDecryption *this;
    size_t plaintextLen;
    char *plaintextPtr;
    VALUE ephemeral, mac, ciphertext, retval;
    TypedData_Get_Struct(self, OlmPkDecryption, &olm_pk_decryption_type, this);

    ephemeral = rb_funcall(pkMessage, rb_intern("ephemeral_key"), 0);
    Check_Type(ephemeral, T_STRING);
    mac = rb_funcall(pkMessage, rb_intern("mac"), 0);
    Check_Type(mac, T_STRING);
    ciphertext = rb_funcall(pkMessage, rb_intern("cipher_text"), 0);
    Check_Type(ciphertext, T_STRING);

    plaintextLen = olm_pk_max_plaintext_length(this, RSTRING_LEN(ciphertext));
    plaintextPtr = malloc_or_raise(plaintextLen);

    plaintextLen = olm_pk_decrypt(this,
                       RSTRING_PTR(ephemeral), RSTRING_LEN(ephemeral),
                       RSTRING_PTR(mac), RSTRING_LEN(mac),
                       RSTRING_PTR(ciphertext), RSTRING_LEN(ciphertext),
                       plaintextPtr, plaintextLen);
    if (plaintextLen == olm_error()) {
        free(plaintextPtr);
        raise_olm_error(olm_pk_decryption_last_error(this));
    }

    retval = rb_str_new(plaintextPtr, plaintextLen);
    free(plaintextPtr);

    return retval;
}

#private_key ⇒ Object 



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# File 'ext/self_crypto/pk_decryption.c', line 100

static VALUE private_key(VALUE self) {
    OlmPkDecryption *this;
    size_t privkeyLen;
    char *privkeyPtr;
    VALUE retval;
    TypedData_Get_Struct(self, OlmPkDecryption, &olm_pk_decryption_type, this);

    privkeyLen = olm_pk_private_key_length();
    privkeyPtr = malloc_or_raise(privkeyLen);

    if (olm_pk_get_private_key(this, privkeyPtr, privkeyLen) == olm_error()) {
        free(privkeyPtr);
        raise_olm_error(olm_pk_decryption_last_error(this));
    }

    retval = rb_str_new(privkeyPtr, privkeyLen);
    free(privkeyPtr);
    return retval;
}