diff options
Diffstat (limited to 'ruby_1_8_5/ext/openssl/ossl_cipher.c')
-rw-r--r-- | ruby_1_8_5/ext/openssl/ossl_cipher.c | 406 |
1 files changed, 406 insertions, 0 deletions
diff --git a/ruby_1_8_5/ext/openssl/ossl_cipher.c b/ruby_1_8_5/ext/openssl/ossl_cipher.c new file mode 100644 index 0000000000..8d96d0b35a --- /dev/null +++ b/ruby_1_8_5/ext/openssl/ossl_cipher.c @@ -0,0 +1,406 @@ +/* + * $Id: ossl_cipher.c,v 1.4.2.6 2006/06/20 11:18:15 gotoyuzo Exp $ + * '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; + + name = StringValuePtr(str); + GetCipher(self, ctx); + 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 void* +add_cipher_name_to_ary(const OBJ_NAME *name, VALUE ary) +{ + rb_ary_push(ary, rb_str_new2(name->name)); + return NULL; +} + +static VALUE +ossl_s_ciphers(VALUE self) +{ +#ifdef HAVE_OBJ_NAME_DO_ALL_SORTED + VALUE ary; + + ary = rb_ary_new(); + OBJ_NAME_do_all_sorted(OBJ_NAME_TYPE_CIPHER_METH, + (void(*)(const OBJ_NAME*,void*))add_cipher_name_to_ary, + (void*)ary); + + return ary; +#else + rb_notimplement(); +#endif +} + +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; + + 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); + GetCipher(self, ctx); + 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; + } + else { + GetCipher(self, ctx); + } + 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; + + 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); + GetCipher(self, ctx); + 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; + + StringValue(data); + in = RSTRING(data)->ptr; + if ((in_len = RSTRING(data)->len) == 0) + rb_raise(rb_eArgError, "data must not be empty"); + GetCipher(self, ctx); + 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_update_deprecated(VALUE self, VALUE data) +{ + char *cname; + + cname = rb_class2name(rb_obj_class(self)); + rb_warning("%s#<< is deprecated; use %s#update instead", cname, cname); + return ossl_cipher_update(self, data); +} + +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; + int len = NUM2INT(key_length); + + GetCipher(self, ctx); + if (EVP_CIPHER_CTX_set_key_length(ctx, len) != 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; + int pad = NUM2INT(padding); + + GetCipher(self, ctx); + if (EVP_CIPHER_CTX_set_padding(ctx, pad) != 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_module_function(mCipher, "ciphers", ossl_s_ciphers, 0); + 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, "<<", ossl_cipher_update_deprecated, 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); +} |