Dear Sir,
I would like to make this contribution to openssl
Feature implemented: aes key wrapper for all key sizes(RFC 5649)
Thanks
/* crypto/aes/aes_wrap.c */
/* Written by Dr Stephen N Henson (st...@openssl.org) for the OpenSSL
* project.
* Modified by Attaullah Baig (ab...@paypal.com) to wrap/unwrap any
* size keys (Implemented RFC5649)
*/
/* ====================================================================
* Copyright (c) 2008 The OpenSSL Project. All rights reserved.
*
* 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 above 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 acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* licens...@openssl.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED 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 OpenSSL PROJECT OR
* ITS 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.
* ====================================================================
*/
#include <openssl/aes.h>
#include <openssl/bio.h>
#include <netinet/in.h>
static const unsigned char default_iv[] = {
0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6,
};
static const unsigned char alternate_iv[] = {
0xA6, 0x59, 0x59, 0xA6,
};
int AES_wrap_key_withpad(AES_KEY *key, unsigned char *out,
const unsigned char *in, unsigned int inlen)
{
int len, nlen, ret = -1;
unsigned char *input, iv[8];
if (!inlen)
return -1;
len = inlen+(inlen%8 == 0 ? 0 : (8-inlen%8));
nlen = htonl(inlen);
input = OPENSSL_malloc(len+8);
if(!input)
return -1;
memset(input, 0, len+8);
memcpy(iv, alternate_iv, 4);
memcpy(iv+4, ((unsigned char *) &nlen), 4);
if(len == 8)
{
memcpy(input, iv, 8);
memcpy(input+8, in, inlen);
AES_encrypt(input, out, key);
ret = 8+8;
}
else
{
memcpy(input, in, inlen);
ret = AES_wrap_key(key, iv, out, input, len);
}
OPENSSL_free(input);
return ret;
}
int AES_unwrap_key_withpad(AES_KEY *key, unsigned char *out,
const unsigned char *in, unsigned int inlen)
{
int len, padlen;
unsigned char a_iv[8], zero_iv[8];
memset(zero_iv, 0, 8);
if (inlen & 0x7)
return -1;
if (inlen < 16)
return -1;
if(inlen == 16)
{
AES_decrypt(in, out, key);
memcpy(a_iv, out, 8);
memmove(out, out+8, 8);
}
else
{
if(AES_unwrap_key(key, NULL, out, in, inlen, a_iv) <= 0)
return -1;
}
if(memcmp(a_iv, alternate_iv, 4))
return -1;
memcpy((unsigned char *) &len, a_iv+4, 4);
len = ntohl(len);
inlen -= 8;
if(len > inlen || len <= (inlen-8))
return -1;
padlen = inlen - len;
if(padlen && memcmp(zero_iv, out+len, padlen))
return -1;
return len;
}
int AES_wrap_key(AES_KEY *key, const unsigned char *iv,
unsigned char *out,
const unsigned char *in, unsigned int inlen)
{
unsigned char *A, B[16], *R;
unsigned int i, j, t;
if ((inlen & 0x7) || (inlen < 8))
return -1;
A = B;
t = 1;
memcpy(out + 8, in, inlen);
if (!iv)
iv = default_iv;
memcpy(A, iv, 8);
for (j = 0; j < 6; j++)
{
R = out + 8;
for (i = 0; i < inlen; i += 8, t++, R += 8)
{
memcpy(B + 8, R, 8);
AES_encrypt(B, B, key);
A[7] ^= (unsigned char)(t & 0xff);
if (t > 0xff)
{
A[6] ^= (unsigned char)((t & 0xff) >> 8);
A[5] ^= (unsigned char)((t & 0xff) >> 16);
A[4] ^= (unsigned char)((t & 0xff) >> 24);
}
memcpy(R, B + 8, 8);
}
}
memcpy(out, A, 8);
return inlen + 8;
}
int AES_unwrap_key(AES_KEY *key, const unsigned char *iv,
unsigned char *out,
const unsigned char *in, unsigned int inlen, unsigned char
*a_iv)
{
unsigned char *A, B[16], *R;
unsigned int i, j, t;
inlen -= 8;
if (inlen & 0x7)
return -1;
if (inlen < 8)
return -1;
A = B;
t = 6 * (inlen >> 3);
memcpy(A, in, 8);
memcpy(out, in + 8, inlen);
for (j = 0; j < 6; j++)
{
R = out + inlen - 8;
for (i = 0; i < inlen; i += 8, t--, R -= 8)
{
A[7] ^= (unsigned char)(t & 0xff);
if (t > 0xff)
{
A[6] ^= (unsigned char)((t & 0xff) >> 8);
A[5] ^= (unsigned char)((t & 0xff) >> 16);
A[4] ^= (unsigned char)((t & 0xff) >> 24);
}
memcpy(B + 8, R, 8);
AES_decrypt(B, B, key);
memcpy(R, B + 8, 8);
}
}
if( a_iv )
memcpy(a_iv, A, 8);
else
{
if (!iv)
iv = default_iv;
if (memcmp(A, iv, 8))
{
OPENSSL_cleanse(out, inlen);
return 0;
}
}
return inlen;
}
#ifdef AES_WRAP_TEST
int AES_wrap_unwrap_test(const unsigned char *kek, int keybits,
const unsigned char *iv,
const unsigned char *eout,
const unsigned char *key, int keylen)
{
unsigned char *otmp = NULL, *ptmp = NULL;
int r, ret = 0;
AES_KEY ectx, dctx;
otmp = OPENSSL_malloc(keylen + 16);
ptmp = OPENSSL_malloc(keylen + 16);
if (!otmp || !ptmp)
return 0;
if (AES_set_encrypt_key(kek, keybits, &ectx))
goto err;
if(eout && keylen%8 == 0)
r = AES_wrap_key(&ectx, iv, otmp, key, keylen);
else
r = AES_wrap_key_withpad(&ectx, otmp, key, keylen);
if (r <= 0)
goto err;
if (eout && memcmp(eout, otmp, keylen))
goto err;
if (AES_set_decrypt_key(kek, keybits, &dctx))
goto err;
if(eout && keylen%8 == 0)
r = AES_unwrap_key(&dctx, iv, ptmp, otmp, r, NULL);
else
r = AES_unwrap_key_withpad(&dctx, ptmp, otmp, r);
if (memcmp(key, ptmp, keylen))
goto err;
ret = 1;
err:
if (otmp)
OPENSSL_free(otmp);
if (ptmp)
OPENSSL_free(ptmp);
return ret;
}
int main(int argc, char **argv)
{
static const unsigned char kek[] = {
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f
};
static const unsigned char kek1[] = {
0x58, 0x40, 0xdf, 0x6e, 0x29, 0xb0, 0x2a, 0xf1,
0xab, 0x49, 0x3b, 0x70, 0x5b, 0xf1, 0x6e, 0xa1,
0xae, 0x83, 0x38, 0xf4, 0xdc, 0xc1, 0x76, 0xa8
};
static const unsigned char key[] = {
0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff,
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f
};
static const unsigned char key1[] = {
0xc3, 0x7b, 0x7e, 0x64, 0x92, 0x58, 0x43, 0x40,
0xbe, 0xd1, 0x22, 0x07, 0x80, 0x89, 0x41, 0x15,
0x50, 0x68, 0xf7, 0x38
};
static const unsigned char key2[] = {
0x46, 0x6f, 0x72, 0x50, 0x61, 0x73, 0x69
};
static const unsigned char ewrap1[] = {
0x13, 0x8b, 0xde, 0xaa, 0x9b, 0x8f, 0xa7, 0xfc,
0x61, 0xf9, 0x77, 0x42, 0xe7, 0x22, 0x48, 0xee,
0x5a, 0xe6, 0xae, 0x53, 0x60, 0xd1, 0xae, 0x6a,
0x5f, 0x54, 0xf3, 0x73, 0xfa, 0x54, 0x3b, 0x6a
};
static const unsigned char ewrap2[] = {
0xaf, 0xbe, 0xb0, 0xf0, 0x7d, 0xfb, 0xf5, 0x41,
0x92, 0x00, 0xf2, 0xcc, 0xb5, 0x0b, 0xb2, 0x4f
};
static const unsigned char e1[] = {
0x1f, 0xa6, 0x8b, 0x0a, 0x81, 0x12, 0xb4, 0x47,
0xae, 0xf3, 0x4b, 0xd8, 0xfb, 0x5a, 0x7b, 0x82,
0x9d, 0x3e, 0x86, 0x23, 0x71, 0xd2, 0xcf, 0xe5
};
static const unsigned char e2[] = {
0x96, 0x77, 0x8b, 0x25, 0xae, 0x6c, 0xa4, 0x35,
0xf9, 0x2b, 0x5b, 0x97, 0xc0, 0x50, 0xae, 0xd2,
0x46, 0x8a, 0xb8, 0xa1, 0x7a, 0xd8, 0x4e, 0x5d
};
static const unsigned char e3[] = {
0x64, 0xe8, 0xc3, 0xf9, 0xce, 0x0f, 0x5b, 0xa2,
0x63, 0xe9, 0x77, 0x79, 0x05, 0x81, 0x8a, 0x2a,
0x93, 0xc8, 0x19, 0x1e, 0x7d, 0x6e, 0x8a, 0xe7
};
static const unsigned char e4[] = {
0x03, 0x1d, 0x33, 0x26, 0x4e, 0x15, 0xd3, 0x32,
0x68, 0xf2, 0x4e, 0xc2, 0x60, 0x74, 0x3e, 0xdc,
0xe1, 0xc6, 0xc7, 0xdd, 0xee, 0x72, 0x5a, 0x93,
0x6b, 0xa8, 0x14, 0x91, 0x5c, 0x67, 0x62, 0xd2
};
static const unsigned char e5[] = {
0xa8, 0xf9, 0xbc, 0x16, 0x12, 0xc6, 0x8b, 0x3f,
0xf6, 0xe6, 0xf4, 0xfb, 0xe3, 0x0e, 0x71, 0xe4,
0x76, 0x9c, 0x8b, 0x80, 0xa3, 0x2c, 0xb8, 0x95,
0x8c, 0xd5, 0xd1, 0x7d, 0x6b, 0x25, 0x4d, 0xa1
};
static const unsigned char e6[] = {
0x28, 0xc9, 0xf4, 0x04, 0xc4, 0xb8, 0x10, 0xf4,
0xcb, 0xcc, 0xb3, 0x5c, 0xfb, 0x87, 0xf8, 0x26,
0x3f, 0x57, 0x86, 0xe2, 0xd8, 0x0e, 0xd3, 0x26,
0xcb, 0xc7, 0xf0, 0xe7, 0x1a, 0x99, 0xf4, 0x3b,
0xfb, 0x98, 0x8b, 0x9b, 0x7a, 0x02, 0xdd, 0x21
};
AES_KEY wctx, xctx;
int ret, i;
FILE *fp;
unsigned char *sample;
int rounds = 100;
sample = OPENSSL_malloc(rounds);
fp = fopen("/dev/urandom", "r");
if(!sample || !fp )
return -1;
for(i=1; i < rounds; i++)
{
fread(sample, 1, i, fp);
ret = AES_wrap_unwrap_test(kek, 128, NULL, NULL, sample, i);
printf("Key test result for %d byte key %d\n", i, ret);
}
fclose(fp);
OPENSSL_free(sample);
ret = AES_wrap_unwrap_test(kek, 128, NULL, e1, key, 16);
fprintf(stderr, "Key test result %d\n", ret);
ret = AES_wrap_unwrap_test(kek, 192, NULL, e2, key, 16);
fprintf(stderr, "Key test result %d\n", ret);
ret = AES_wrap_unwrap_test(kek, 256, NULL, e3, key, 16);
fprintf(stderr, "Key test result %d\n", ret);
ret = AES_wrap_unwrap_test(kek, 192, NULL, e4, key, 24);
fprintf(stderr, "Key test result %d\n", ret);
ret = AES_wrap_unwrap_test(kek, 256, NULL, e5, key, 24);
fprintf(stderr, "Key test result %d\n", ret);
ret = AES_wrap_unwrap_test(kek, 256, NULL, e6, key, 32);
fprintf(stderr, "Key test result %d\n", ret);
ret = AES_wrap_unwrap_test(kek1, 192, NULL, ewrap1, key1, 20);
fprintf(stderr, "Key test result %d\n", ret);
ret = AES_wrap_unwrap_test(kek1, 192, NULL, ewrap2, key2, 7);
fprintf(stderr, "Key test result %d\n", ret);
}
#endif
