diff options
Diffstat (limited to 'src/lib/crypto/openssl/enc_provider/des3.c')
| -rw-r--r-- | src/lib/crypto/openssl/enc_provider/des3.c | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/src/lib/crypto/openssl/enc_provider/des3.c b/src/lib/crypto/openssl/enc_provider/des3.c new file mode 100644 index 0000000000000..1c439c2cd23aa --- /dev/null +++ b/src/lib/crypto/openssl/enc_provider/des3.c @@ -0,0 +1,184 @@ +/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */ +/* lib/crypto/openssl/enc_provider/des3.c */ +/* + * Copyright (C) 2009 by the Massachusetts Institute of Technology. + * All rights reserved. + * + * Export of this software from the United States of America may + * require a specific license from the United States Government. + * It is the responsibility of any person or organization contemplating + * export to obtain such a license before exporting. + * + * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and + * distribute this software and its documentation for any purpose and + * without fee is hereby granted, provided that the above copyright + * notice appear in all copies and that both that copyright notice and + * this permission notice appear in supporting documentation, and that + * the name of M.I.T. not be used in advertising or publicity pertaining + * to distribution of the software without specific, written prior + * permission. Furthermore if you modify this software you must label + * your software as modified software and not distribute it in such a + * fashion that it might be confused with the original M.I.T. software. + * M.I.T. makes no representations about the suitability of + * this software for any purpose. It is provided "as is" without express + * or implied warranty. + */ +/* + * Copyright (C) 1998 by the FundsXpress, INC. + * + * All rights reserved. + * + * Export of this software from the United States of America may require + * a specific license from the United States Government. It is the + * responsibility of any person or organization contemplating export to + * obtain such a license before exporting. + * + * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and + * distribute this software and its documentation for any purpose and + * without fee is hereby granted, provided that the above copyright + * notice appear in all copies and that both that copyright notice and + * this permission notice appear in supporting documentation, and that + * the name of FundsXpress. not be used in advertising or publicity pertaining + * to distribution of the software without specific, written prior + * permission. FundsXpress makes no representations about the suitability of + * this software for any purpose. It is provided "as is" without express + * or implied warranty. + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED + * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. + */ + +#include "crypto_int.h" +#include <openssl/evp.h> + + +#define DES3_BLOCK_SIZE 8 +#define DES3_KEY_SIZE 24 +#define DES3_KEY_BYTES 21 + +static krb5_error_code +validate(krb5_key key, const krb5_data *ivec, const krb5_crypto_iov *data, + size_t num_data, krb5_boolean *empty) +{ + size_t input_length = iov_total_length(data, num_data, FALSE); + + if (key->keyblock.length != DES3_KEY_SIZE) + return(KRB5_BAD_KEYSIZE); + if ((input_length%DES3_BLOCK_SIZE) != 0) + return(KRB5_BAD_MSIZE); + if (ivec && (ivec->length != 8)) + return(KRB5_BAD_MSIZE); + + *empty = (input_length == 0); + return 0; +} + +static krb5_error_code +k5_des3_encrypt(krb5_key key, const krb5_data *ivec, krb5_crypto_iov *data, + size_t num_data) +{ + int ret, olen = DES3_BLOCK_SIZE; + unsigned char iblock[DES3_BLOCK_SIZE], oblock[DES3_BLOCK_SIZE]; + struct iov_cursor cursor; + EVP_CIPHER_CTX *ctx; + krb5_boolean empty; + + ret = validate(key, ivec, data, num_data, &empty); + if (ret != 0 || empty) + return ret; + + ctx = EVP_CIPHER_CTX_new(); + if (ctx == NULL) + return ENOMEM; + + ret = EVP_EncryptInit_ex(ctx, EVP_des_ede3_cbc(), NULL, + key->keyblock.contents, + (ivec) ? (unsigned char*)ivec->data : NULL); + if (!ret) { + EVP_CIPHER_CTX_free(ctx); + return KRB5_CRYPTO_INTERNAL; + } + + EVP_CIPHER_CTX_set_padding(ctx,0); + + k5_iov_cursor_init(&cursor, data, num_data, DES3_BLOCK_SIZE, FALSE); + while (k5_iov_cursor_get(&cursor, iblock)) { + ret = EVP_EncryptUpdate(ctx, oblock, &olen, iblock, DES3_BLOCK_SIZE); + if (!ret) + break; + k5_iov_cursor_put(&cursor, oblock); + } + + if (ivec != NULL) + memcpy(ivec->data, oblock, DES3_BLOCK_SIZE); + + EVP_CIPHER_CTX_free(ctx); + + zap(iblock, sizeof(iblock)); + zap(oblock, sizeof(oblock)); + + if (ret != 1) + return KRB5_CRYPTO_INTERNAL; + return 0; +} + +static krb5_error_code +k5_des3_decrypt(krb5_key key, const krb5_data *ivec, krb5_crypto_iov *data, + size_t num_data) +{ + int ret, olen = DES3_BLOCK_SIZE; + unsigned char iblock[DES3_BLOCK_SIZE], oblock[DES3_BLOCK_SIZE]; + struct iov_cursor cursor; + EVP_CIPHER_CTX *ctx; + krb5_boolean empty; + + ret = validate(key, ivec, data, num_data, &empty); + if (ret != 0 || empty) + return ret; + + ctx = EVP_CIPHER_CTX_new(); + if (ctx == NULL) + return ENOMEM; + + ret = EVP_DecryptInit_ex(ctx, EVP_des_ede3_cbc(), NULL, + key->keyblock.contents, + (ivec) ? (unsigned char*)ivec->data : NULL); + if (!ret) { + EVP_CIPHER_CTX_free(ctx); + return KRB5_CRYPTO_INTERNAL; + } + + EVP_CIPHER_CTX_set_padding(ctx,0); + + k5_iov_cursor_init(&cursor, data, num_data, DES3_BLOCK_SIZE, FALSE); + while (k5_iov_cursor_get(&cursor, iblock)) { + ret = EVP_DecryptUpdate(ctx, oblock, &olen, + (unsigned char *)iblock, DES3_BLOCK_SIZE); + if (!ret) + break; + k5_iov_cursor_put(&cursor, oblock); + } + + if (ivec != NULL) + memcpy(ivec->data, iblock, DES3_BLOCK_SIZE); + + EVP_CIPHER_CTX_free(ctx); + + zap(iblock, sizeof(iblock)); + zap(oblock, sizeof(oblock)); + + if (ret != 1) + return KRB5_CRYPTO_INTERNAL; + return 0; +} + +const struct krb5_enc_provider krb5int_enc_des3 = { + DES3_BLOCK_SIZE, + DES3_KEY_BYTES, DES3_KEY_SIZE, + k5_des3_encrypt, + k5_des3_decrypt, + NULL, + krb5int_des_init_state, + krb5int_default_free_state +}; |