diff options
Diffstat (limited to 'third_party/heimdal/lib/krb5/crypto-des-common.c')
| -rw-r--r-- | third_party/heimdal/lib/krb5/crypto-des-common.c | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/third_party/heimdal/lib/krb5/crypto-des-common.c b/third_party/heimdal/lib/krb5/crypto-des-common.c new file mode 100644 index 0000000..a8344ae --- /dev/null +++ b/third_party/heimdal/lib/krb5/crypto-des-common.c @@ -0,0 +1,158 @@ +/* + * Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan + * (Royal Institute of Technology, Stockholm, Sweden). + * 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. Neither the name of the Institute nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE 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. + */ + +/* Functions which are used by both single and triple DES enctypes */ + +#include "krb5_locl.h" + +/* + * A = A xor B. A & B are 8 bytes. + */ + +KRB5_LIB_FUNCTION void KRB5_LIB_CALL +_krb5_xor8(unsigned char *a, const unsigned char *b) +{ + a[0] ^= b[0]; + a[1] ^= b[1]; + a[2] ^= b[2]; + a[3] ^= b[3]; + a[4] ^= b[4]; + a[5] ^= b[5]; + a[6] ^= b[6]; + a[7] ^= b[7]; +} + +#if defined(DES3_OLD_ENCTYPE) || defined(HEIM_WEAK_CRYPTO) +KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL +_krb5_des_checksum(krb5_context context, + const EVP_MD *evp_md, + struct _krb5_key_data *key, + const struct krb5_crypto_iov *iov, + int niov, + Checksum *cksum) +{ + struct _krb5_evp_schedule *ctx = key->schedule->data; + EVP_MD_CTX *m; + DES_cblock ivec; + int i; + unsigned char *p = cksum->checksum.data; + + krb5_generate_random_block(p, 8); + + m = EVP_MD_CTX_create(); + if (m == NULL) + return krb5_enomem(context); + + EVP_DigestInit_ex(m, evp_md, NULL); + EVP_DigestUpdate(m, p, 8); + for (i = 0; i < niov; i++) { + if (_krb5_crypto_iov_should_sign(&iov[i])) + EVP_DigestUpdate(m, iov[i].data.data, iov[i].data.length); + } + EVP_DigestFinal_ex (m, p + 8, NULL); + EVP_MD_CTX_destroy(m); + memset_s(&ivec, sizeof(ivec), 0, sizeof(ivec)); + EVP_CipherInit_ex(&ctx->ectx, NULL, NULL, NULL, (void *)&ivec, -1); + EVP_Cipher(&ctx->ectx, p, p, 24); + + return 0; +} + +KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL +_krb5_des_verify(krb5_context context, + const EVP_MD *evp_md, + struct _krb5_key_data *key, + const struct krb5_crypto_iov *iov, + int niov, + Checksum *C) +{ + struct _krb5_evp_schedule *ctx = key->schedule->data; + EVP_MD_CTX *m; + unsigned char tmp[24]; + unsigned char res[16]; + DES_cblock ivec; + krb5_error_code ret = 0; + int i; + + m = EVP_MD_CTX_create(); + if (m == NULL) + return krb5_enomem(context); + + memset_s(&ivec, sizeof(ivec), 0, sizeof(ivec)); + EVP_CipherInit_ex(&ctx->dctx, NULL, NULL, NULL, (void *)&ivec, -1); + EVP_Cipher(&ctx->dctx, tmp, C->checksum.data, 24); + + EVP_DigestInit_ex(m, evp_md, NULL); + EVP_DigestUpdate(m, tmp, 8); /* confounder */ + for (i = 0; i < niov; i++) { + if (_krb5_crypto_iov_should_sign(&iov[i])) + EVP_DigestUpdate(m, iov[i].data.data, iov[i].data.length); + } + EVP_DigestFinal_ex (m, res, NULL); + EVP_MD_CTX_destroy(m); + if(ct_memcmp(res, tmp + 8, sizeof(res)) != 0) { + krb5_clear_error_message (context); + ret = KRB5KRB_AP_ERR_BAD_INTEGRITY; + } + memset_s(tmp, sizeof(tmp), 0, sizeof(tmp)); + memset_s(res, sizeof(res), 0, sizeof(res)); + return ret; +} + +#endif + +static krb5_error_code +RSA_MD5_checksum(krb5_context context, + krb5_crypto crypto, + struct _krb5_key_data *key, + unsigned usage, + const struct krb5_crypto_iov *iov, + int niov, + Checksum *C) +{ + if (_krb5_evp_digest_iov(crypto, iov, niov, C->checksum.data, + NULL, EVP_md5(), NULL) != 1) + krb5_abortx(context, "md5 checksum failed"); + + return 0; +} + +struct _krb5_checksum_type _krb5_checksum_rsa_md5 = { + CKSUMTYPE_RSA_MD5, + "rsa-md5", + 64, + 16, + F_CPROOF, + RSA_MD5_checksum, + NULL +}; |