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ruby--ruby/ext/openssl/ossl_cipher.c

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/*
* $Id$
* 'OpenSSL for Ruby' project
* Copyright (C) 2001-2002 Michal Rokos <m.rokos@sh.cvut.cz>
* All rights reserved.
*/
/*
* This program is licenced under the same licence as Ruby.
* (See the file 'LICENCE'.)
*/
#include "ossl.h"
#define MakeCipher(obj, klass, ctx) \
obj = Data_Make_Struct(klass, EVP_CIPHER_CTX, 0, ossl_cipher_free, ctx)
#define GetCipher(obj, ctx) do { \
Data_Get_Struct(obj, EVP_CIPHER_CTX, ctx); \
if (!ctx) { \
ossl_raise(rb_eRuntimeError, "Cipher not inititalized!"); \
} \
} while (0)
#define SafeGetCipher(obj, ctx) do { \
OSSL_Check_Kind(obj, cCipher); \
GetCipher(obj, ctx); \
} while (0)
/*
* Classes
*/
VALUE mCipher;
VALUE cCipher;
VALUE eCipherError;
static VALUE ossl_cipher_alloc(VALUE klass);
/*
* PUBLIC
*/
const EVP_CIPHER *
GetCipherPtr(VALUE obj)
{
EVP_CIPHER_CTX *ctx;
SafeGetCipher(obj, ctx);
return EVP_CIPHER_CTX_cipher(ctx);
}
VALUE
ossl_cipher_new(const EVP_CIPHER *cipher)
{
VALUE ret;
EVP_CIPHER_CTX *ctx;
ret = ossl_cipher_alloc(cCipher);
GetCipher(ret, ctx);
EVP_CIPHER_CTX_init(ctx);
if (EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, -1) != 1)
ossl_raise(eCipherError, NULL);
return ret;
}
/*
* PRIVATE
*/
static void
ossl_cipher_free(EVP_CIPHER_CTX *ctx)
{
if (ctx) {
EVP_CIPHER_CTX_cleanup(ctx);
free(ctx);
}
}
static VALUE
ossl_cipher_alloc(VALUE klass)
{
EVP_CIPHER_CTX *ctx;
VALUE obj;
MakeCipher(obj, klass, ctx);
EVP_CIPHER_CTX_init(ctx);
return obj;
}
static VALUE
ossl_cipher_initialize(VALUE self, VALUE str)
{
EVP_CIPHER_CTX *ctx;
const EVP_CIPHER *cipher;
char *name;
GetCipher(self, ctx);
name = StringValuePtr(str);
if (!(cipher = EVP_get_cipherbyname(name))) {
ossl_raise(rb_eRuntimeError, "Unsupported cipher algorithm (%s).", name);
}
if (EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, -1) != 1)
ossl_raise(eCipherError, NULL);
return self;
}
static VALUE
ossl_cipher_copy(VALUE self, VALUE other)
{
EVP_CIPHER_CTX *ctx1, *ctx2;
rb_check_frozen(self);
if (self == other) return self;
GetCipher(self, ctx1);
SafeGetCipher(other, ctx2);
if (EVP_CIPHER_CTX_copy(ctx1, ctx2) != 1)
ossl_raise(eCipherError, NULL);
return self;
}
static VALUE
ossl_cipher_reset(VALUE self)
{
EVP_CIPHER_CTX *ctx;
GetCipher(self, ctx);
if (EVP_CipherInit_ex(ctx, NULL, NULL, NULL, NULL, -1) != 1)
ossl_raise(eCipherError, NULL);
return self;
}
static VALUE
ossl_cipher_init(int argc, VALUE *argv, VALUE self, int mode)
{
EVP_CIPHER_CTX *ctx;
unsigned char key[EVP_MAX_KEY_LENGTH], *p_key = NULL;
unsigned char iv[EVP_MAX_IV_LENGTH], *p_iv = NULL;
VALUE pass, init_v;
GetCipher(self, ctx);
if(rb_scan_args(argc, argv, "02", &pass, &init_v) > 0){
/*
* oops. this code mistakes salt for IV.
* We deprecated the arguments for this method, but we decided
* keeping this behaviour for backward compatibility.
*/
StringValue(pass);
if (NIL_P(init_v)) memcpy(iv, "OpenSSL for Ruby rulez!", sizeof(iv));
else{
char *cname = rb_class2name(rb_obj_class(self));
rb_warning("key derivation by %s#encrypt is deprecated; "
"use %s::pkcs5_keyivgen instead", cname, cname);
StringValue(init_v);
if (EVP_MAX_IV_LENGTH > RSTRING(init_v)->len) {
memset(iv, 0, EVP_MAX_IV_LENGTH);
memcpy(iv, RSTRING(init_v)->ptr, RSTRING(init_v)->len);
}
else memcpy(iv, RSTRING(init_v)->ptr, sizeof(iv));
}
EVP_BytesToKey(EVP_CIPHER_CTX_cipher(ctx), EVP_md5(), iv,
RSTRING(pass)->ptr, RSTRING(pass)->len, 1, key, NULL);
p_key = key;
p_iv = iv;
}
if (EVP_CipherInit_ex(ctx, NULL, NULL, p_key, p_iv, mode) != 1) {
ossl_raise(eCipherError, NULL);
}
return self;
}
static VALUE
ossl_cipher_encrypt(int argc, VALUE *argv, VALUE self)
{
return ossl_cipher_init(argc, argv, self, 1);
}
static VALUE
ossl_cipher_decrypt(int argc, VALUE *argv, VALUE self)
{
return ossl_cipher_init(argc, argv, self, 0);
}
static VALUE
ossl_cipher_pkcs5_keyivgen(int argc, VALUE *argv, VALUE self)
{
EVP_CIPHER_CTX *ctx;
const EVP_MD *digest;
VALUE vpass, vsalt, viter, vdigest;
unsigned char key[EVP_MAX_KEY_LENGTH], iv[EVP_MAX_IV_LENGTH], *salt = NULL;
int iter;
GetCipher(self, ctx);
rb_scan_args(argc, argv, "13", &vpass, &vsalt, &viter, &vdigest);
StringValue(vpass);
if(!NIL_P(vsalt)){
StringValue(vsalt);
if(RSTRING(vsalt)->len != PKCS5_SALT_LEN)
rb_raise(eCipherError, "salt must be an 8-octet string.");
salt = RSTRING(vsalt)->ptr;
}
iter = NIL_P(viter) ? 2048 : NUM2INT(viter);
digest = NIL_P(vdigest) ? EVP_md5() : GetDigestPtr(vdigest);
EVP_BytesToKey(EVP_CIPHER_CTX_cipher(ctx), digest, salt,
RSTRING(vpass)->ptr, RSTRING(vpass)->len, iter, key, iv);
if (EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, -1) != 1)
ossl_raise(eCipherError, NULL);
OPENSSL_cleanse(key, sizeof key);
OPENSSL_cleanse(iv, sizeof iv);
return Qnil;
}
static VALUE
ossl_cipher_update(VALUE self, VALUE data)
{
EVP_CIPHER_CTX *ctx;
char *in;
int in_len, out_len;
VALUE str;
GetCipher(self, ctx);
StringValue(data);
in = RSTRING(data)->ptr;
in_len = RSTRING(data)->len;
str = rb_str_new(0, in_len+EVP_CIPHER_CTX_block_size(ctx));
if (!EVP_CipherUpdate(ctx, RSTRING(str)->ptr, &out_len, in, in_len))
ossl_raise(eCipherError, NULL);
assert(out_len < RSTRING(str)->len);
RSTRING(str)->len = out_len;
RSTRING(str)->ptr[out_len] = 0;
return str;
}
static VALUE
ossl_cipher_final(VALUE self)
{
EVP_CIPHER_CTX *ctx;
int out_len;
VALUE str;
GetCipher(self, ctx);
str = rb_str_new(0, EVP_CIPHER_CTX_block_size(ctx));
if (!EVP_CipherFinal_ex(ctx, RSTRING(str)->ptr, &out_len))
ossl_raise(eCipherError, NULL);
assert(out_len <= RSTRING(str)->len);
RSTRING(str)->len = out_len;
RSTRING(str)->ptr[out_len] = 0;
return str;
}
static VALUE
ossl_cipher_name(VALUE self)
{
EVP_CIPHER_CTX *ctx;
GetCipher(self, ctx);
return rb_str_new2(EVP_CIPHER_name(EVP_CIPHER_CTX_cipher(ctx)));
}
static VALUE
ossl_cipher_set_key(VALUE self, VALUE key)
{
EVP_CIPHER_CTX *ctx;
StringValue(key);
GetCipher(self, ctx);
if (RSTRING(key)->len < EVP_CIPHER_CTX_key_length(ctx))
ossl_raise(eCipherError, "key length too short");
if (EVP_CipherInit_ex(ctx, NULL, NULL, RSTRING(key)->ptr, NULL, -1) != 1)
ossl_raise(eCipherError, NULL);
return key;
}
static VALUE
ossl_cipher_set_iv(VALUE self, VALUE iv)
{
EVP_CIPHER_CTX *ctx;
StringValue(iv);
GetCipher(self, ctx);
if (RSTRING(iv)->len < EVP_CIPHER_CTX_iv_length(ctx))
ossl_raise(eCipherError, "iv length too short");
if (EVP_CipherInit_ex(ctx, NULL, NULL, NULL, RSTRING(iv)->ptr, -1) != 1)
ossl_raise(eCipherError, NULL);
return iv;
}
static VALUE
ossl_cipher_set_key_length(VALUE self, VALUE key_length)
{
EVP_CIPHER_CTX *ctx;
GetCipher(self, ctx);
if (EVP_CIPHER_CTX_set_key_length(ctx, NUM2INT(key_length)) != 1)
ossl_raise(eCipherError, NULL);
return key_length;
}
static VALUE
ossl_cipher_set_padding(VALUE self, VALUE padding)
{
#if defined(HAVE_EVP_CIPHER_CTX_SET_PADDING)
EVP_CIPHER_CTX *ctx;
GetCipher(self, ctx);
if (EVP_CIPHER_CTX_set_padding(ctx, NUM2INT(padding)) != 1)
ossl_raise(eCipherError, NULL);
#else
rb_notimplement();
#endif
return padding;
}
#define CIPHER_0ARG_INT(func) \
static VALUE \
ossl_cipher_##func(VALUE self) \
{ \
EVP_CIPHER_CTX *ctx; \
GetCipher(self, ctx); \
return INT2NUM(EVP_CIPHER_##func(EVP_CIPHER_CTX_cipher(ctx))); \
}
CIPHER_0ARG_INT(key_length)
CIPHER_0ARG_INT(iv_length)
CIPHER_0ARG_INT(block_size)
/*
* INIT
*/
void
Init_ossl_cipher(void)
{
mCipher = rb_define_module_under(mOSSL, "Cipher");
eCipherError = rb_define_class_under(mOSSL, "CipherError", eOSSLError);
cCipher = rb_define_class_under(mCipher, "Cipher", rb_cObject);
rb_define_alloc_func(cCipher, ossl_cipher_alloc);
rb_define_copy_func(cCipher, ossl_cipher_copy);
rb_define_method(cCipher, "initialize", ossl_cipher_initialize, 1);
rb_define_method(cCipher, "reset", ossl_cipher_reset, 0);
rb_define_method(cCipher, "encrypt", ossl_cipher_encrypt, -1);
rb_define_method(cCipher, "decrypt", ossl_cipher_decrypt, -1);
rb_define_method(cCipher, "pkcs5_keyivgen", ossl_cipher_pkcs5_keyivgen, -1);
rb_define_method(cCipher, "update", ossl_cipher_update, 1);
rb_define_method(cCipher, "final", ossl_cipher_final, 0);
rb_define_method(cCipher, "name", ossl_cipher_name, 0);
rb_define_method(cCipher, "key=", ossl_cipher_set_key, 1);
rb_define_method(cCipher, "key_len=", ossl_cipher_set_key_length, 1);
rb_define_method(cCipher, "key_len", ossl_cipher_key_length, 0);
rb_define_method(cCipher, "iv=", ossl_cipher_set_iv, 1);
rb_define_method(cCipher, "iv_len", ossl_cipher_iv_length, 0);
rb_define_method(cCipher, "block_size", ossl_cipher_block_size, 0);
rb_define_method(cCipher, "padding=", ossl_cipher_set_padding, 1);
}
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