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ab509c0edb
not be empty. [ruby-talk:161220]
* test/openssl/test_cipher.rb: add test for Cipher#update("").
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@9485 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
370 lines
9.2 KiB
C
370 lines
9.2 KiB
C
/*
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* $Id$
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* 'OpenSSL for Ruby' project
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* Copyright (C) 2001-2002 Michal Rokos <m.rokos@sh.cvut.cz>
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* All rights reserved.
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*/
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/*
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* This program is licenced under the same licence as Ruby.
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* (See the file 'LICENCE'.)
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*/
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#include "ossl.h"
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#define MakeCipher(obj, klass, ctx) \
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obj = Data_Make_Struct(klass, EVP_CIPHER_CTX, 0, ossl_cipher_free, ctx)
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#define GetCipher(obj, ctx) do { \
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Data_Get_Struct(obj, EVP_CIPHER_CTX, ctx); \
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if (!ctx) { \
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ossl_raise(rb_eRuntimeError, "Cipher not inititalized!"); \
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} \
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} while (0)
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#define SafeGetCipher(obj, ctx) do { \
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OSSL_Check_Kind(obj, cCipher); \
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GetCipher(obj, ctx); \
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} while (0)
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/*
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* Classes
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*/
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VALUE mCipher;
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VALUE cCipher;
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VALUE eCipherError;
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static VALUE ossl_cipher_alloc(VALUE klass);
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/*
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* PUBLIC
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*/
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const EVP_CIPHER *
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GetCipherPtr(VALUE obj)
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{
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EVP_CIPHER_CTX *ctx;
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SafeGetCipher(obj, ctx);
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return EVP_CIPHER_CTX_cipher(ctx);
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}
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VALUE
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ossl_cipher_new(const EVP_CIPHER *cipher)
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{
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VALUE ret;
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EVP_CIPHER_CTX *ctx;
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ret = ossl_cipher_alloc(cCipher);
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GetCipher(ret, ctx);
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EVP_CIPHER_CTX_init(ctx);
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if (EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, -1) != 1)
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ossl_raise(eCipherError, NULL);
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return ret;
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}
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/*
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* PRIVATE
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*/
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static void
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ossl_cipher_free(EVP_CIPHER_CTX *ctx)
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{
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if (ctx) {
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EVP_CIPHER_CTX_cleanup(ctx);
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free(ctx);
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}
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}
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static VALUE
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ossl_cipher_alloc(VALUE klass)
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{
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EVP_CIPHER_CTX *ctx;
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VALUE obj;
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MakeCipher(obj, klass, ctx);
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EVP_CIPHER_CTX_init(ctx);
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return obj;
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}
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static VALUE
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ossl_cipher_initialize(VALUE self, VALUE str)
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{
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EVP_CIPHER_CTX *ctx;
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const EVP_CIPHER *cipher;
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char *name;
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name = StringValuePtr(str);
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GetCipher(self, ctx);
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if (!(cipher = EVP_get_cipherbyname(name))) {
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ossl_raise(rb_eRuntimeError, "unsupported cipher algorithm (%s)", name);
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}
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if (EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, -1) != 1)
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ossl_raise(eCipherError, NULL);
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return self;
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}
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static VALUE
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ossl_cipher_copy(VALUE self, VALUE other)
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{
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EVP_CIPHER_CTX *ctx1, *ctx2;
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rb_check_frozen(self);
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if (self == other) return self;
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GetCipher(self, ctx1);
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SafeGetCipher(other, ctx2);
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if (EVP_CIPHER_CTX_copy(ctx1, ctx2) != 1)
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ossl_raise(eCipherError, NULL);
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return self;
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}
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static VALUE
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ossl_cipher_reset(VALUE self)
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{
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EVP_CIPHER_CTX *ctx;
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GetCipher(self, ctx);
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if (EVP_CipherInit_ex(ctx, NULL, NULL, NULL, NULL, -1) != 1)
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ossl_raise(eCipherError, NULL);
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return self;
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}
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static VALUE
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ossl_cipher_init(int argc, VALUE *argv, VALUE self, int mode)
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{
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EVP_CIPHER_CTX *ctx;
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unsigned char key[EVP_MAX_KEY_LENGTH], *p_key = NULL;
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unsigned char iv[EVP_MAX_IV_LENGTH], *p_iv = NULL;
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VALUE pass, init_v;
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if(rb_scan_args(argc, argv, "02", &pass, &init_v) > 0){
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/*
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* oops. this code mistakes salt for IV.
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* We deprecated the arguments for this method, but we decided
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* keeping this behaviour for backward compatibility.
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*/
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StringValue(pass);
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GetCipher(self, ctx);
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if (NIL_P(init_v)) memcpy(iv, "OpenSSL for Ruby rulez!", sizeof(iv));
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else{
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char *cname = rb_class2name(rb_obj_class(self));
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rb_warning("key derivation by %s#encrypt is deprecated; "
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"use %s::pkcs5_keyivgen instead", cname, cname);
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StringValue(init_v);
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if (EVP_MAX_IV_LENGTH > RSTRING(init_v)->len) {
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memset(iv, 0, EVP_MAX_IV_LENGTH);
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memcpy(iv, RSTRING(init_v)->ptr, RSTRING(init_v)->len);
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}
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else memcpy(iv, RSTRING(init_v)->ptr, sizeof(iv));
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}
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EVP_BytesToKey(EVP_CIPHER_CTX_cipher(ctx), EVP_md5(), iv,
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RSTRING(pass)->ptr, RSTRING(pass)->len, 1, key, NULL);
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p_key = key;
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p_iv = iv;
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}
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else {
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GetCipher(self, ctx);
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}
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if (EVP_CipherInit_ex(ctx, NULL, NULL, p_key, p_iv, mode) != 1) {
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ossl_raise(eCipherError, NULL);
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}
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return self;
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}
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static VALUE
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ossl_cipher_encrypt(int argc, VALUE *argv, VALUE self)
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{
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return ossl_cipher_init(argc, argv, self, 1);
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}
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static VALUE
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ossl_cipher_decrypt(int argc, VALUE *argv, VALUE self)
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{
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return ossl_cipher_init(argc, argv, self, 0);
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}
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static VALUE
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ossl_cipher_pkcs5_keyivgen(int argc, VALUE *argv, VALUE self)
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{
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EVP_CIPHER_CTX *ctx;
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const EVP_MD *digest;
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VALUE vpass, vsalt, viter, vdigest;
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unsigned char key[EVP_MAX_KEY_LENGTH], iv[EVP_MAX_IV_LENGTH], *salt = NULL;
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int iter;
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rb_scan_args(argc, argv, "13", &vpass, &vsalt, &viter, &vdigest);
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StringValue(vpass);
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if(!NIL_P(vsalt)){
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StringValue(vsalt);
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if(RSTRING(vsalt)->len != PKCS5_SALT_LEN)
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rb_raise(eCipherError, "salt must be an 8-octet string");
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salt = RSTRING(vsalt)->ptr;
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}
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iter = NIL_P(viter) ? 2048 : NUM2INT(viter);
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digest = NIL_P(vdigest) ? EVP_md5() : GetDigestPtr(vdigest);
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GetCipher(self, ctx);
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EVP_BytesToKey(EVP_CIPHER_CTX_cipher(ctx), digest, salt,
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RSTRING(vpass)->ptr, RSTRING(vpass)->len, iter, key, iv);
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if (EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, -1) != 1)
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ossl_raise(eCipherError, NULL);
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OPENSSL_cleanse(key, sizeof key);
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OPENSSL_cleanse(iv, sizeof iv);
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return Qnil;
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}
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static VALUE
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ossl_cipher_update(VALUE self, VALUE data)
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{
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EVP_CIPHER_CTX *ctx;
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char *in;
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int in_len, out_len;
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VALUE str;
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StringValue(data);
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in = RSTRING(data)->ptr;
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if ((in_len = RSTRING(data)->len) == 0)
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rb_raise(rb_eArgError, "data must not be empty");
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GetCipher(self, ctx);
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str = rb_str_new(0, in_len+EVP_CIPHER_CTX_block_size(ctx));
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if (!EVP_CipherUpdate(ctx, RSTRING(str)->ptr, &out_len, in, in_len))
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ossl_raise(eCipherError, NULL);
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assert(out_len < RSTRING(str)->len);
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RSTRING(str)->len = out_len;
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RSTRING(str)->ptr[out_len] = 0;
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return str;
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}
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static VALUE
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ossl_cipher_final(VALUE self)
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{
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EVP_CIPHER_CTX *ctx;
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int out_len;
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VALUE str;
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GetCipher(self, ctx);
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str = rb_str_new(0, EVP_CIPHER_CTX_block_size(ctx));
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if (!EVP_CipherFinal_ex(ctx, RSTRING(str)->ptr, &out_len))
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ossl_raise(eCipherError, NULL);
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assert(out_len <= RSTRING(str)->len);
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RSTRING(str)->len = out_len;
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RSTRING(str)->ptr[out_len] = 0;
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return str;
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}
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static VALUE
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ossl_cipher_name(VALUE self)
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{
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EVP_CIPHER_CTX *ctx;
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GetCipher(self, ctx);
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return rb_str_new2(EVP_CIPHER_name(EVP_CIPHER_CTX_cipher(ctx)));
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}
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static VALUE
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ossl_cipher_set_key(VALUE self, VALUE key)
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{
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EVP_CIPHER_CTX *ctx;
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StringValue(key);
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GetCipher(self, ctx);
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if (RSTRING(key)->len < EVP_CIPHER_CTX_key_length(ctx))
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ossl_raise(eCipherError, "key length too short");
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if (EVP_CipherInit_ex(ctx, NULL, NULL, RSTRING(key)->ptr, NULL, -1) != 1)
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ossl_raise(eCipherError, NULL);
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return key;
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}
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static VALUE
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ossl_cipher_set_iv(VALUE self, VALUE iv)
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{
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EVP_CIPHER_CTX *ctx;
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StringValue(iv);
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GetCipher(self, ctx);
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if (RSTRING(iv)->len < EVP_CIPHER_CTX_iv_length(ctx))
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ossl_raise(eCipherError, "iv length too short");
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if (EVP_CipherInit_ex(ctx, NULL, NULL, NULL, RSTRING(iv)->ptr, -1) != 1)
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ossl_raise(eCipherError, NULL);
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return iv;
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}
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static VALUE
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ossl_cipher_set_key_length(VALUE self, VALUE key_length)
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{
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int len = NUM2INT(key_length);
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EVP_CIPHER_CTX *ctx;
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GetCipher(self, ctx);
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if (EVP_CIPHER_CTX_set_key_length(ctx, len) != 1)
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ossl_raise(eCipherError, NULL);
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return key_length;
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}
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static VALUE
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ossl_cipher_set_padding(VALUE self, VALUE padding)
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{
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#if defined(HAVE_EVP_CIPHER_CTX_SET_PADDING)
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EVP_CIPHER_CTX *ctx;
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int pad = NUM2INT(padding);
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GetCipher(self, ctx);
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if (EVP_CIPHER_CTX_set_padding(ctx, pad) != 1)
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ossl_raise(eCipherError, NULL);
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#else
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rb_notimplement();
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#endif
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return padding;
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}
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#define CIPHER_0ARG_INT(func) \
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static VALUE \
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ossl_cipher_##func(VALUE self) \
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{ \
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EVP_CIPHER_CTX *ctx; \
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GetCipher(self, ctx); \
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return INT2NUM(EVP_CIPHER_##func(EVP_CIPHER_CTX_cipher(ctx))); \
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}
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CIPHER_0ARG_INT(key_length)
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CIPHER_0ARG_INT(iv_length)
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CIPHER_0ARG_INT(block_size)
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/*
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* INIT
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*/
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void
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Init_ossl_cipher(void)
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{
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mCipher = rb_define_module_under(mOSSL, "Cipher");
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eCipherError = rb_define_class_under(mOSSL, "CipherError", eOSSLError);
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cCipher = rb_define_class_under(mCipher, "Cipher", rb_cObject);
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rb_define_alloc_func(cCipher, ossl_cipher_alloc);
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rb_define_copy_func(cCipher, ossl_cipher_copy);
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rb_define_method(cCipher, "initialize", ossl_cipher_initialize, 1);
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rb_define_method(cCipher, "reset", ossl_cipher_reset, 0);
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rb_define_method(cCipher, "encrypt", ossl_cipher_encrypt, -1);
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rb_define_method(cCipher, "decrypt", ossl_cipher_decrypt, -1);
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rb_define_method(cCipher, "pkcs5_keyivgen", ossl_cipher_pkcs5_keyivgen, -1);
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rb_define_method(cCipher, "update", ossl_cipher_update, 1);
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rb_define_method(cCipher, "final", ossl_cipher_final, 0);
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rb_define_method(cCipher, "name", ossl_cipher_name, 0);
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rb_define_method(cCipher, "key=", ossl_cipher_set_key, 1);
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rb_define_method(cCipher, "key_len=", ossl_cipher_set_key_length, 1);
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rb_define_method(cCipher, "key_len", ossl_cipher_key_length, 0);
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rb_define_method(cCipher, "iv=", ossl_cipher_set_iv, 1);
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rb_define_method(cCipher, "iv_len", ossl_cipher_iv_length, 0);
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rb_define_method(cCipher, "block_size", ossl_cipher_block_size, 0);
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rb_define_method(cCipher, "padding=", ossl_cipher_set_padding, 1);
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}
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