diff options
Diffstat (limited to 'crypto/libressl/crypto/aes/aes_wrap.c')
| -rw-r--r-- | crypto/libressl/crypto/aes/aes_wrap.c | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/crypto/libressl/crypto/aes/aes_wrap.c b/crypto/libressl/crypto/aes/aes_wrap.c new file mode 100644 index 0000000..b30630f --- /dev/null +++ b/crypto/libressl/crypto/aes/aes_wrap.c @@ -0,0 +1,133 @@ +/* $OpenBSD: aes_wrap.c,v 1.12 2018/11/07 18:31:16 tb Exp $ */ +/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL + * project. + */ +/* ==================================================================== + * 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 + * licensing@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/aes.h> +#include <openssl/bio.h> + +static const unsigned char default_iv[] = { + 0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6, +}; + +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 < 16)) + return -1; + A = B; + t = 1; + memmove(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 >> 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 +AES_unwrap_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 < 24)) + return -1; + inlen -= 8; + A = B; + t = 6 * (inlen >> 3); + memcpy(A, in, 8); + memmove(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); + AES_decrypt(B, B, key); + memcpy(R, B + 8, 8); + } + } + if (!iv) + iv = default_iv; + if (memcmp(A, iv, 8)) { + explicit_bzero(out, inlen); + return 0; + } + return inlen; +} |