| /* crypto/evp/enc_min.c */ |
| /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
| * All rights reserved. |
| * |
| * This package is an SSL implementation written |
| * by Eric Young (eay@cryptsoft.com). |
| * The implementation was written so as to conform with Netscapes SSL. |
| * |
| * This library is free for commercial and non-commercial use as long as |
| * the following conditions are aheared to. The following conditions |
| * apply to all code found in this distribution, be it the RC4, RSA, |
| * lhash, DES, etc., code; not just the SSL code. The SSL documentation |
| * included with this distribution is covered by the same copyright terms |
| * except that the holder is Tim Hudson (tjh@cryptsoft.com). |
| * |
| * Copyright remains Eric Young's, and as such any Copyright notices in |
| * the code are not to be removed. |
| * If this package is used in a product, Eric Young should be given attribution |
| * as the author of the parts of the library used. |
| * This can be in the form of a textual message at program startup or |
| * in documentation (online or textual) provided with the package. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. All advertising materials mentioning features or use of this software |
| * must display the following acknowledgement: |
| * "This product includes cryptographic software written by |
| * Eric Young (eay@cryptsoft.com)" |
| * The word 'cryptographic' can be left out if the rouines from the library |
| * being used are not cryptographic related :-). |
| * 4. If you include any Windows specific code (or a derivative thereof) from |
| * the apps directory (application code) you must include an acknowledgement: |
| * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
| * |
| * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * |
| * The licence and distribution terms for any publically available version or |
| * derivative of this code cannot be changed. i.e. this code cannot simply be |
| * copied and put under another distribution licence |
| * [including the GNU Public Licence.] |
| */ |
| |
| #include <stdio.h> |
| #include "cryptlib.h" |
| #include <openssl/evp.h> |
| #include <openssl/err.h> |
| #include <openssl/rand.h> |
| #ifndef OPENSSL_NO_ENGINE |
| #include <openssl/engine.h> |
| #endif |
| #include "evp_locl.h" |
| |
| void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx) |
| { |
| #ifdef OPENSSL_FIPS |
| FIPS_selftest_check(); |
| #endif |
| memset(ctx,0,sizeof(EVP_CIPHER_CTX)); |
| /* ctx->cipher=NULL; */ |
| } |
| |
| #ifdef OPENSSL_FIPS |
| |
| /* The purpose of these is to trap programs that attempt to use non FIPS |
| * algorithms in FIPS mode and ignore the errors. |
| */ |
| |
| static int bad_init(EVP_CIPHER_CTX *ctx, const unsigned char *key, |
| const unsigned char *iv, int enc) |
| { FIPS_ERROR_IGNORED("Cipher init"); return 0;} |
| |
| static int bad_do_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, |
| const unsigned char *in, unsigned int inl) |
| { FIPS_ERROR_IGNORED("Cipher update"); return 0;} |
| |
| /* NB: no cleanup because it is allowed after failed init */ |
| |
| static int bad_set_asn1(EVP_CIPHER_CTX *ctx, ASN1_TYPE *typ) |
| { FIPS_ERROR_IGNORED("Cipher set_asn1"); return 0;} |
| static int bad_get_asn1(EVP_CIPHER_CTX *ctx, ASN1_TYPE *typ) |
| { FIPS_ERROR_IGNORED("Cipher get_asn1"); return 0;} |
| static int bad_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr) |
| { FIPS_ERROR_IGNORED("Cipher ctrl"); return 0;} |
| |
| static const EVP_CIPHER bad_cipher = |
| { |
| 0, |
| 0, |
| 0, |
| 0, |
| 0, |
| bad_init, |
| bad_do_cipher, |
| NULL, |
| 0, |
| bad_set_asn1, |
| bad_get_asn1, |
| bad_ctrl, |
| NULL |
| }; |
| |
| #endif |
| |
| #ifndef OPENSSL_NO_ENGINE |
| |
| #ifdef OPENSSL_FIPS |
| |
| static int do_engine_null(ENGINE *impl) { return 0;} |
| static int do_evp_enc_engine_null(EVP_CIPHER_CTX *ctx, |
| const EVP_CIPHER **pciph, ENGINE *impl) |
| { return 1; } |
| |
| static int (*do_engine_finish)(ENGINE *impl) |
| = do_engine_null; |
| |
| static int (*do_evp_enc_engine) |
| (EVP_CIPHER_CTX *ctx, const EVP_CIPHER **pciph, ENGINE *impl) |
| = do_evp_enc_engine_null; |
| |
| void int_EVP_CIPHER_set_engine_callbacks( |
| int (*eng_ciph_fin)(ENGINE *impl), |
| int (*eng_ciph_evp) |
| (EVP_CIPHER_CTX *ctx, const EVP_CIPHER **pciph, ENGINE *impl)) |
| { |
| do_engine_finish = eng_ciph_fin; |
| do_evp_enc_engine = eng_ciph_evp; |
| } |
| |
| #else |
| |
| #define do_engine_finish ENGINE_finish |
| |
| static int do_evp_enc_engine(EVP_CIPHER_CTX *ctx, const EVP_CIPHER **pcipher, ENGINE *impl) |
| { |
| if(impl) |
| { |
| if (!ENGINE_init(impl)) |
| { |
| EVPerr(EVP_F_DO_EVP_ENC_ENGINE, EVP_R_INITIALIZATION_ERROR); |
| return 0; |
| } |
| } |
| else |
| /* Ask if an ENGINE is reserved for this job */ |
| impl = ENGINE_get_cipher_engine((*pcipher)->nid); |
| if(impl) |
| { |
| /* There's an ENGINE for this job ... (apparently) */ |
| const EVP_CIPHER *c = ENGINE_get_cipher(impl, (*pcipher)->nid); |
| if(!c) |
| { |
| /* One positive side-effect of US's export |
| * control history, is that we should at least |
| * be able to avoid using US mispellings of |
| * "initialisation"? */ |
| EVPerr(EVP_F_DO_EVP_ENC_ENGINE, EVP_R_INITIALIZATION_ERROR); |
| return 0; |
| } |
| /* We'll use the ENGINE's private cipher definition */ |
| *pcipher = c; |
| /* Store the ENGINE functional reference so we know |
| * 'cipher' came from an ENGINE and we need to release |
| * it when done. */ |
| ctx->engine = impl; |
| } |
| else |
| ctx->engine = NULL; |
| return 1; |
| } |
| |
| #endif |
| |
| #endif |
| |
| int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl, |
| const unsigned char *key, const unsigned char *iv, int enc) |
| { |
| if (enc == -1) |
| enc = ctx->encrypt; |
| else |
| { |
| if (enc) |
| enc = 1; |
| ctx->encrypt = enc; |
| } |
| #ifdef OPENSSL_NO_FIPS |
| if(FIPS_selftest_failed()) |
| { |
| FIPSerr(FIPS_F_EVP_CIPHERINIT_EX,FIPS_R_FIPS_SELFTEST_FAILED); |
| ctx->cipher = &bad_cipher; |
| return 0; |
| } |
| #endif |
| #ifndef OPENSSL_NO_ENGINE |
| /* Whether it's nice or not, "Inits" can be used on "Final"'d contexts |
| * so this context may already have an ENGINE! Try to avoid releasing |
| * the previous handle, re-querying for an ENGINE, and having a |
| * reinitialisation, when it may all be unecessary. */ |
| if (ctx->engine && ctx->cipher && (!cipher || |
| (cipher && (cipher->nid == ctx->cipher->nid)))) |
| goto skip_to_init; |
| #endif |
| if (cipher) |
| { |
| /* Ensure a context left lying around from last time is cleared |
| * (the previous check attempted to avoid this if the same |
| * ENGINE and EVP_CIPHER could be used). */ |
| EVP_CIPHER_CTX_cleanup(ctx); |
| |
| /* Restore encrypt field: it is zeroed by cleanup */ |
| ctx->encrypt = enc; |
| #ifndef OPENSSL_NO_ENGINE |
| if (!do_evp_enc_engine(ctx, &cipher, impl)) |
| return 0; |
| #endif |
| |
| ctx->cipher=cipher; |
| if (ctx->cipher->ctx_size) |
| { |
| ctx->cipher_data=OPENSSL_malloc(ctx->cipher->ctx_size); |
| if (!ctx->cipher_data) |
| { |
| EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE); |
| return 0; |
| } |
| } |
| else |
| { |
| ctx->cipher_data = NULL; |
| } |
| ctx->key_len = cipher->key_len; |
| ctx->flags = 0; |
| if(ctx->cipher->flags & EVP_CIPH_CTRL_INIT) |
| { |
| if(!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) |
| { |
| EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); |
| return 0; |
| } |
| } |
| } |
| else if(!ctx->cipher) |
| { |
| EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_NO_CIPHER_SET); |
| return 0; |
| } |
| #ifndef OPENSSL_NO_ENGINE |
| skip_to_init: |
| #endif |
| /* we assume block size is a power of 2 in *cryptUpdate */ |
| OPENSSL_assert(ctx->cipher->block_size == 1 |
| || ctx->cipher->block_size == 8 |
| || ctx->cipher->block_size == 16); |
| |
| if(!(EVP_CIPHER_CTX_flags(ctx) & EVP_CIPH_CUSTOM_IV)) { |
| switch(EVP_CIPHER_CTX_mode(ctx)) { |
| |
| case EVP_CIPH_STREAM_CIPHER: |
| case EVP_CIPH_ECB_MODE: |
| break; |
| |
| case EVP_CIPH_CFB_MODE: |
| case EVP_CIPH_OFB_MODE: |
| |
| ctx->num = 0; |
| |
| case EVP_CIPH_CBC_MODE: |
| |
| OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <= |
| (int)sizeof(ctx->iv)); |
| if(iv) memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx)); |
| memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx)); |
| break; |
| |
| default: |
| return 0; |
| break; |
| } |
| } |
| |
| #ifdef OPENSSL_FIPS |
| /* After 'key' is set no further parameters changes are permissible. |
| * So only check for non FIPS enabling at this point. |
| */ |
| if (key && FIPS_mode()) |
| { |
| if (!(ctx->cipher->flags & EVP_CIPH_FLAG_FIPS) |
| & !(ctx->flags & EVP_CIPH_FLAG_NON_FIPS_ALLOW)) |
| { |
| EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_DISABLED_FOR_FIPS); |
| #if 0 |
| ERR_add_error_data(2, "cipher=", |
| EVP_CIPHER_name(ctx->cipher)); |
| #endif |
| ctx->cipher = &bad_cipher; |
| return 0; |
| } |
| } |
| #endif |
| |
| if(key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) { |
| if(!ctx->cipher->init(ctx,key,iv,enc)) return 0; |
| } |
| ctx->buf_len=0; |
| ctx->final_used=0; |
| ctx->block_mask=ctx->cipher->block_size-1; |
| return 1; |
| } |
| |
| int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c) |
| { |
| if (c->cipher != NULL) |
| { |
| if(c->cipher->cleanup && !c->cipher->cleanup(c)) |
| return 0; |
| /* Cleanse cipher context data */ |
| if (c->cipher_data) |
| OPENSSL_cleanse(c->cipher_data, c->cipher->ctx_size); |
| } |
| if (c->cipher_data) |
| OPENSSL_free(c->cipher_data); |
| #ifndef OPENSSL_NO_ENGINE |
| if (c->engine) |
| /* The EVP_CIPHER we used belongs to an ENGINE, release the |
| * functional reference we held for this reason. */ |
| do_engine_finish(c->engine); |
| #endif |
| memset(c,0,sizeof(EVP_CIPHER_CTX)); |
| return 1; |
| } |
| |
| int EVP_Cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in, unsigned int inl) |
| { |
| #ifdef OPENSSL_FIPS |
| FIPS_selftest_check(); |
| #endif |
| return ctx->cipher->do_cipher(ctx,out,in,inl); |
| } |
| |
| int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr) |
| { |
| int ret; |
| if(!ctx->cipher) { |
| EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET); |
| return 0; |
| } |
| |
| if(!ctx->cipher->ctrl) { |
| EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED); |
| return 0; |
| } |
| |
| ret = ctx->cipher->ctrl(ctx, type, arg, ptr); |
| if(ret == -1) { |
| EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED); |
| return 0; |
| } |
| return ret; |
| } |
| |
| unsigned long EVP_CIPHER_CTX_flags(const EVP_CIPHER_CTX *ctx) |
| { |
| return ctx->cipher->flags; |
| } |
| |
| int EVP_CIPHER_CTX_iv_length(const EVP_CIPHER_CTX *ctx) |
| { |
| return ctx->cipher->iv_len; |
| } |
| |
| int EVP_CIPHER_nid(const EVP_CIPHER *cipher) |
| { |
| return cipher->nid; |
| } |