1 files changed, 109 insertions, 0 deletions
diff --git a/src/lib/crypto/krb/enc_raw.c b/src/lib/crypto/krb/enc_raw.c
new file mode 100644
index 0000000000000..554d5c4d648d0
--- /dev/null
+++ b/src/lib/crypto/krb/enc_raw.c
@@ -0,0 +1,109 @@
+/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
+/* lib/crypto/krb/enc_raw.c */
+/*
+ * Copyright 2008 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.
+ */
+
+
+#include "crypto_int.h"
+
+unsigned int
+krb5int_raw_crypto_length(const struct krb5_keytypes *ktp,
+                          krb5_cryptotype type)
+{
+    switch (type) {
+    case KRB5_CRYPTO_TYPE_PADDING:
+        return ktp->enc->block_size;
+    default:
+        return 0;
+    }
+}
+
+krb5_error_code
+krb5int_raw_encrypt(const struct krb5_keytypes *ktp, krb5_key key,
+                    krb5_keyusage usage, const krb5_data *ivec,
+                    krb5_crypto_iov *data, size_t num_data)
+{
+    krb5_crypto_iov *padding;
+    size_t i;
+    unsigned int blocksize, plainlen = 0, padsize = 0;
+
+    blocksize = ktp->crypto_length(ktp, KRB5_CRYPTO_TYPE_PADDING);
+
+    for (i = 0; i < num_data; i++) {
+        krb5_crypto_iov *iov = &data[i];
+
+        if (iov->flags == KRB5_CRYPTO_TYPE_DATA)
+            plainlen += iov->data.length;
+    }
+
+    if (blocksize != 0) {
+        /* Check that the input data is correctly padded */
+        if (plainlen % blocksize)
+            padsize = blocksize - (plainlen % blocksize);
+    }
+
+    padding = krb5int_c_locate_iov(data, num_data, KRB5_CRYPTO_TYPE_PADDING);
+    if (padsize && (padding == NULL || padding->data.length < padsize))
+        return KRB5_BAD_MSIZE;
+
+    if (padding != NULL) {
+        memset(padding->data.data, 0, padsize);
+        padding->data.length = padsize;
+    }
+
+    return ktp->enc->encrypt(key, ivec, data, num_data);
+}
+
+krb5_error_code
+krb5int_raw_decrypt(const struct krb5_keytypes *ktp, krb5_key key,
+                    krb5_keyusage usage, const krb5_data *ivec,
+                    krb5_crypto_iov *data, size_t num_data)
+{
+    size_t i;
+    unsigned int blocksize = 0; /* enc block size, not confounder len */
+    unsigned int cipherlen = 0;
+
+    /* E(Confounder | Plaintext | Pad) | Checksum */
+
+    blocksize = ktp->crypto_length(ktp, KRB5_CRYPTO_TYPE_PADDING);
+
+    for (i = 0; i < num_data; i++) {
+        const krb5_crypto_iov *iov = &data[i];
+
+        if (ENCRYPT_DATA_IOV(iov))
+            cipherlen += iov->data.length;
+    }
+
+    if (blocksize == 0) {
+        /* Check for correct input length in CTS mode */
+        if (ktp->enc->block_size != 0 && cipherlen < ktp->enc->block_size)
+            return KRB5_BAD_MSIZE;
+    } else {
+        /* Check that the input data is correctly padded */
+        if (cipherlen % blocksize != 0)
+            return KRB5_BAD_MSIZE;
+    }
+
+    return ktp->enc->decrypt(key, ivec, data, num_data);
+}