initial/final commitHEADmaster

1 files changed, 209 insertions, 0 deletions

diff --git a/openssl-1.1.0h/crypto/modes/ctr128.c b/openssl-1.1.0h/crypto/modes/ctr128.c
new file mode 100644
index 0000000..03920b4
--- /dev/null
+++ b/openssl-1.1.0h/crypto/modes/ctr128.c
@@ -0,0 +1,209 @@
+/*
+ * Copyright 2008-2016 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL license (the "License").  You may not use
+ * this file except in compliance with the License.  You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+#include <openssl/crypto.h>
+#include "modes_lcl.h"
+#include <string.h>
+
+/*
+ * NOTE: the IV/counter CTR mode is big-endian.  The code itself is
+ * endian-neutral.
+ */
+
+/* increment counter (128-bit int) by 1 */
+static void ctr128_inc(unsigned char *counter)
+{
+    u32 n = 16, c = 1;
+
+    do {
+        --n;
+        c += counter[n];
+        counter[n] = (u8)c;
+        c >>= 8;
+    } while (n);
+}
+
+#if !defined(OPENSSL_SMALL_FOOTPRINT)
+static void ctr128_inc_aligned(unsigned char *counter)
+{
+    size_t *data, c, d, n;
+    const union {
+        long one;
+        char little;
+    } is_endian = {
+        1
+    };
+
+    if (is_endian.little || ((size_t)counter % sizeof(size_t)) != 0) {
+        ctr128_inc(counter);
+        return;
+    }
+
+    data = (size_t *)counter;
+    c = 1;
+    n = 16 / sizeof(size_t);
+    do {
+        --n;
+        d = data[n] += c;
+        /* did addition carry? */
+        c = ((d - c) & ~d) >> (sizeof(size_t) * 8 - 1);
+    } while (n);
+}
+#endif
+
+/*
+ * The input encrypted as though 128bit counter mode is being used.  The
+ * extra state information to record how much of the 128bit block we have
+ * used is contained in *num, and the encrypted counter is kept in
+ * ecount_buf.  Both *num and ecount_buf must be initialised with zeros
+ * before the first call to CRYPTO_ctr128_encrypt(). This algorithm assumes
+ * that the counter is in the x lower bits of the IV (ivec), and that the
+ * application has full control over overflow and the rest of the IV.  This
+ * implementation takes NO responsibility for checking that the counter
+ * doesn't overflow into the rest of the IV when incremented.
+ */
+void CRYPTO_ctr128_encrypt(const unsigned char *in, unsigned char *out,
+                           size_t len, const void *key,
+                           unsigned char ivec[16],
+                           unsigned char ecount_buf[16], unsigned int *num,
+                           block128_f block)
+{
+    unsigned int n;
+    size_t l = 0;
+
+    n = *num;
+
+#if !defined(OPENSSL_SMALL_FOOTPRINT)
+    if (16 % sizeof(size_t) == 0) { /* always true actually */
+        do {
+            while (n && len) {
+                *(out++) = *(in++) ^ ecount_buf[n];
+                --len;
+                n = (n + 1) % 16;
+            }
+
+# if defined(STRICT_ALIGNMENT)
+            if (((size_t)in | (size_t)out | (size_t)ecount_buf)
+                % sizeof(size_t) != 0)
+                break;
+# endif
+            while (len >= 16) {
+                (*block) (ivec, ecount_buf, key);
+                ctr128_inc_aligned(ivec);
+                for (n = 0; n < 16; n += sizeof(size_t))
+                    *(size_t *)(out + n) =
+                        *(size_t *)(in + n) ^ *(size_t *)(ecount_buf + n);
+                len -= 16;
+                out += 16;
+                in += 16;
+                n = 0;
+            }
+            if (len) {
+                (*block) (ivec, ecount_buf, key);
+                ctr128_inc_aligned(ivec);
+                while (len--) {
+                    out[n] = in[n] ^ ecount_buf[n];
+                    ++n;
+                }
+            }
+            *num = n;
+            return;
+        } while (0);
+    }
+    /* the rest would be commonly eliminated by x86* compiler */
+#endif
+    while (l < len) {
+        if (n == 0) {
+            (*block) (ivec, ecount_buf, key);
+            ctr128_inc(ivec);
+        }
+        out[l] = in[l] ^ ecount_buf[n];
+        ++l;
+        n = (n + 1) % 16;
+    }
+
+    *num = n;
+}
+
+/* increment upper 96 bits of 128-bit counter by 1 */
+static void ctr96_inc(unsigned char *counter)
+{
+    u32 n = 12, c = 1;
+
+    do {
+        --n;
+        c += counter[n];
+        counter[n] = (u8)c;
+        c >>= 8;
+    } while (n);
+}
+
+void CRYPTO_ctr128_encrypt_ctr32(const unsigned char *in, unsigned char *out,
+                                 size_t len, const void *key,
+                                 unsigned char ivec[16],
+                                 unsigned char ecount_buf[16],
+                                 unsigned int *num, ctr128_f func)
+{
+    unsigned int n, ctr32;
+
+    n = *num;
+
+    while (n && len) {
+        *(out++) = *(in++) ^ ecount_buf[n];
+        --len;
+        n = (n + 1) % 16;
+    }
+
+    ctr32 = GETU32(ivec + 12);
+    while (len >= 16) {
+        size_t blocks = len / 16;
+        /*
+         * 1<<28 is just a not-so-small yet not-so-large number...
+         * Below condition is practically never met, but it has to
+         * be checked for code correctness.
+         */
+        if (sizeof(size_t) > sizeof(unsigned int) && blocks > (1U << 28))
+            blocks = (1U << 28);
+        /*
+         * As (*func) operates on 32-bit counter, caller
+         * has to handle overflow. 'if' below detects the
+         * overflow, which is then handled by limiting the
+         * amount of blocks to the exact overflow point...
+         */
+        ctr32 += (u32)blocks;
+        if (ctr32 < blocks) {
+            blocks -= ctr32;
+            ctr32 = 0;
+        }
+        (*func) (in, out, blocks, key, ivec);
+        /* (*ctr) does not update ivec, caller does: */
+        PUTU32(ivec + 12, ctr32);
+        /* ... overflow was detected, propagate carry. */
+        if (ctr32 == 0)
+            ctr96_inc(ivec);
+        blocks *= 16;
+        len -= blocks;
+        out += blocks;
+        in += blocks;
+    }
+    if (len) {
+        memset(ecount_buf, 0, 16);
+        (*func) (ecount_buf, ecount_buf, 1, key, ivec);
+        ++ctr32;
+        PUTU32(ivec + 12, ctr32);
+        if (ctr32 == 0)
+            ctr96_inc(ivec);
+        while (len--) {
+            out[n] = in[n] ^ ecount_buf[n];
+            ++n;
+        }
+    }
+
+    *num = n;
+}