On Wed, May 21, 2014, Raghav Varadan wrote: > Hi, > > I'm using Openssl FIPS in my application. The application does some AES Key > Wrap/Unwrap and uses function calls to > AES_set_encrypt_key()/AES_wrap_key()/AES_unwrap_key(). But in FIPS mode > call to these low-level crypto function calls are forbidden. I would like > to know if there is an EVP* interface to do wrap crypto keys using Key > Encryption Key for transportation. >
Currently the built in AES wrap calls are not supported in FIPS mode. You can implement the algorithm using EVP instead. I've attached an example. Steve. -- Dr Stephen N. Henson. OpenSSL project core developer. Commercial tech support now available see: http://www.openssl.org
/* e_aeswrap.c */ /* Written by Dr Stephen N Henson (st...@openssl.org) for the OpenSSL * project. */ /* ==================================================================== * Copyright (c) 2012 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 <string.h> #include <openssl/evp.h> static const unsigned char default_iv[] = { 0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6, }; int EVP_aes_wrap_key(EVP_CIPHER_CTX *ctx, 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); EVP_Cipher(ctx, B, B, EVP_CIPHER_CTX_block_size(ctx)); A[7] ^= (unsigned char)(t & 0xff); if (t > 0xff) { A[6] ^= (unsigned char)((t >> 8) & 0xff); A[5] ^= (unsigned char)((t >> 16) & 0xff); A[4] ^= (unsigned char)((t >> 24) & 0xff); } memcpy(R, B + 8, 8); } } memcpy(out, A, 8); return inlen + 8; } int EVP_aes_unwrap_key(EVP_CIPHER_CTX *ctx, 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; 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 >> 8) & 0xff); A[5] ^= (unsigned char)((t >> 16) & 0xff); A[4] ^= (unsigned char)((t >> 24) & 0xff); } memcpy(B + 8, R, 8); EVP_Cipher(ctx, B, B, EVP_CIPHER_CTX_block_size(ctx)); memcpy(R, B + 8, 8); } } if (!iv) iv = default_iv; if (CRYPTO_memcmp(A, iv, 8)) { OPENSSL_cleanse(out, inlen); return 0; } return inlen; } #ifdef AES_WRAP_TEST int EVP_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; EVP_CIPHER_CTX wctx; const EVP_CIPHER *cipher; EVP_CIPHER_CTX_init(&wctx); if (keybits == 128) cipher = EVP_aes_128_ecb(); else if (keybits == 192) cipher = EVP_aes_192_ecb(); else if (keybits == 256) cipher = EVP_aes_256_ecb(); else return 0; otmp = OPENSSL_malloc(keylen + 8); ptmp = OPENSSL_malloc(keylen); if (!otmp || !ptmp) return 0; if (!EVP_CipherInit_ex(&wctx, cipher, NULL, kek, NULL, 1)) goto err; r = EVP_aes_wrap_key(&wctx, iv, otmp, key, keylen); if (r <= 0) goto err; if (eout && memcmp(eout, otmp, keylen)) goto err; if (!EVP_CipherInit_ex(&wctx, cipher, NULL, kek, NULL, 0)) goto err; r = EVP_aes_unwrap_key(&wctx, iv, ptmp, otmp, r); if (memcmp(key, ptmp, keylen)) goto err; ret = 1; err: EVP_CIPHER_CTX_cleanup(&wctx); 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 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 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 }; int ret; ret = EVP_aes_wrap_unwrap_test(kek, 128, NULL, e1, key, 16); fprintf(stderr, "Key test result %d\n", ret); ret = EVP_aes_wrap_unwrap_test(kek, 192, NULL, e2, key, 16); fprintf(stderr, "Key test result %d\n", ret); ret = EVP_aes_wrap_unwrap_test(kek, 256, NULL, e3, key, 16); fprintf(stderr, "Key test result %d\n", ret); ret = EVP_aes_wrap_unwrap_test(kek, 192, NULL, e4, key, 24); fprintf(stderr, "Key test result %d\n", ret); ret = EVP_aes_wrap_unwrap_test(kek, 256, NULL, e5, key, 24); fprintf(stderr, "Key test result %d\n", ret); ret = EVP_aes_wrap_unwrap_test(kek, 256, NULL, e6, key, 32); fprintf(stderr, "Key test result %d\n", ret); } #endif
