openssl/fips/utl/fips_enc.c
Richard Levitte 399aa6b5ff Implement FIPS CMAC.
* fips/cmac/*: Implement the basis for FIPS CMAC, using FIPS HMAC as
  an example.
* crypto/cmac/cmac.c: Enable the FIPS API.  Change to use M_EVP macros
  where possible.
* crypto/evp/evp.h: (some of the macros get added with this change)
* fips/fips.h, fips/utl/fips_enc.c: Add a few needed functions and use
  macros to have cmac.c use these functions.
* Makefile.org, fips/Makefile, fips/fips.c: Hook it in.
2011-03-24 22:55:02 +00:00

333 lines
9.5 KiB
C

/* fipe/evp/fips_enc.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.]
*/
#define OPENSSL_FIPSAPI
#include <stdio.h>
#include <string.h>
#include <openssl/evp.h>
#include <openssl/err.h>
#include <openssl/fips.h>
void FIPS_cipher_ctx_init(EVP_CIPHER_CTX *ctx)
{
memset(ctx,0,sizeof(EVP_CIPHER_CTX));
/* ctx->cipher=NULL; */
}
EVP_CIPHER_CTX *FIPS_cipher_ctx_new(void)
{
EVP_CIPHER_CTX *ctx=OPENSSL_malloc(sizeof *ctx);
if (ctx)
FIPS_cipher_ctx_init(ctx);
return ctx;
}
/* 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, size_t 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
};
int FIPS_cipherinit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
const unsigned char *key, const unsigned char *iv, int enc)
{
if(FIPS_selftest_failed())
{
FIPSerr(FIPS_F_FIPS_CIPHERINIT,FIPS_R_FIPS_SELFTEST_FAILED);
ctx->cipher = &bad_cipher;
return 0;
}
if (enc == -1)
enc = ctx->encrypt;
else
{
if (enc)
enc = 1;
ctx->encrypt = enc;
}
if (cipher)
{
/* Only FIPS ciphers allowed */
if (FIPS_mode() && !(cipher->flags & EVP_CIPH_FLAG_FIPS) &&
!(ctx->flags & EVP_CIPH_FLAG_NON_FIPS_ALLOW))
{
EVPerr(EVP_F_FIPS_CIPHERINIT, EVP_R_DISABLED_FOR_FIPS);
ctx->cipher = &bad_cipher;
return 0;
}
/* 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). */
FIPS_cipher_ctx_cleanup(ctx);
/* Restore encrypt field: it is zeroed by cleanup */
ctx->encrypt = enc;
ctx->cipher=cipher;
if (ctx->cipher->ctx_size)
{
ctx->cipher_data=OPENSSL_malloc(ctx->cipher->ctx_size);
if (!ctx->cipher_data)
{
EVPerr(EVP_F_FIPS_CIPHERINIT, 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(!FIPS_cipher_ctx_ctrl(ctx, EVP_CTRL_INIT, 0, NULL))
{
EVPerr(EVP_F_FIPS_CIPHERINIT, EVP_R_INITIALIZATION_ERROR);
return 0;
}
}
}
else if(!ctx->cipher)
{
EVPerr(EVP_F_FIPS_CIPHERINIT, EVP_R_NO_CIPHER_SET);
return 0;
}
/* 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(!(M_EVP_CIPHER_CTX_flags(ctx) & EVP_CIPH_CUSTOM_IV)) {
switch(M_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;
/* fall-through */
case EVP_CIPH_CBC_MODE:
OPENSSL_assert(M_EVP_CIPHER_CTX_iv_length(ctx) <=
(int)sizeof(ctx->iv));
if(iv) memcpy(ctx->oiv, iv, M_EVP_CIPHER_CTX_iv_length(ctx));
memcpy(ctx->iv, ctx->oiv, M_EVP_CIPHER_CTX_iv_length(ctx));
break;
case EVP_CIPH_CTR_MODE:
/* Don't reuse IV for CTR mode */
if(iv)
memcpy(ctx->iv, iv, M_EVP_CIPHER_CTX_iv_length(ctx));
break;
default:
return 0;
break;
}
}
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;
}
void FIPS_cipher_ctx_free(EVP_CIPHER_CTX *ctx)
{
if (ctx)
{
FIPS_cipher_ctx_cleanup(ctx);
OPENSSL_free(ctx);
}
}
int FIPS_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);
memset(c,0,sizeof(EVP_CIPHER_CTX));
return 1;
}
int FIPS_cipher_ctx_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
{
int ret;
if(!ctx->cipher) {
EVPerr(EVP_F_FIPS_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
return 0;
}
FIPS_selftest_check();
if(!ctx->cipher->ctrl) {
EVPerr(EVP_F_FIPS_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
return 0;
}
ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
if(ret == -1) {
EVPerr(EVP_F_FIPS_CIPHER_CTX_CTRL, EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
return 0;
}
return ret;
}
int FIPS_cipher_ctx_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in)
{
if ((in == NULL) || (in->cipher == NULL))
{
EVPerr(EVP_F_FIPS_CIPHER_CTX_COPY,EVP_R_INPUT_NOT_INITIALIZED);
return 0;
}
/* Only FIPS ciphers allowed */
if (FIPS_mode() && !(in->cipher->flags & EVP_CIPH_FLAG_FIPS) &&
!(out->flags & EVP_CIPH_FLAG_NON_FIPS_ALLOW))
{
EVPerr(EVP_F_FIPS_CIPHER_CTX_COPY, EVP_R_DISABLED_FOR_FIPS);
out->cipher = &bad_cipher;
return 0;
}
FIPS_cipher_ctx_cleanup(out);
memcpy(out,in,sizeof *out);
if (in->cipher_data && in->cipher->ctx_size)
{
out->cipher_data=OPENSSL_malloc(in->cipher->ctx_size);
if (!out->cipher_data)
{
EVPerr(EVP_F_FIPS_CIPHER_CTX_COPY,ERR_R_MALLOC_FAILURE);
return 0;
}
memcpy(out->cipher_data,in->cipher_data,in->cipher->ctx_size);
}
if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY)
return in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out);
return 1;
}
/* You can't really set the key length with FIPS, so just check that the
caller sets the length the context already has. */
int FIPS_cipher_ctx_set_key_length(EVP_CIPHER_CTX *ctx, int keylen)
{
if (ctx->key_len == keylen)
return 1;
EVPerr(EVP_F_FIPS_CIPHER_CTX_SET_KEY_LENGTH,EVP_R_INVALID_KEY_LENGTH);
return 0;
}
int FIPS_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
const unsigned char *in, unsigned int inl)
{
FIPS_selftest_check();
return ctx->cipher->do_cipher(ctx,out,in,inl);
}