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+/*
+ * Copyright (c) 2015 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/* MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm */
+
+/* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
+rights reserved.
+
+License to copy and use this software is granted provided that it
+is identified as the "RSA Data Security, Inc. MD5 Message-Digest
+Algorithm" in all material mentioning or referencing this software
+or this function.
+
+License is also granted to make and use derivative works provided
+that such works are identified as "derived from the RSA Data
+Security, Inc. MD5 Message-Digest Algorithm" in all material
+mentioning or referencing the derived work.
+
+RSA Data Security, Inc. makes no representations concerning either
+the merchantability of this software or the suitability of this
+software for any particular purpose. It is provided "as is"
+without express or implied warranty of any kind.
+
+These notices must be retained in any copies of any part of this
+documentation and/or software.
+ */
+
+#include <vppinfra/string.h> /* for memset */
+#include <vppinfra/byte_order.h>
+#include <vppinfra/md5.h>
+
+/* F, G, H and I are basic MD5 functions. */
+#define F(b, c, d) (d ^ (b & (c ^ d)))
+#define G(b, c, d) F (d, b, c)
+#define H(b, c, d) (b ^ c ^ d)
+#define I(b, c, d) (c ^ (b | ~d))
+
+/* ROTATE_LEFT rotates x left n bits. */
+#define ROTATE_LEFT(x,n) \
+ (((x) << (n)) | ((x) >> (32 - (n))))
+
+/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
+ Rotation is separate from addition to prevent recomputation. */
+#define FF(a,b,c,d,x,s,ac) \
+do { \
+ a += F (b, c, d) + x + ac; \
+ a = ROTATE_LEFT (a, s); \
+ a += b; \
+} while (0)
+
+#define GG(a,b,c,d,x,s,ac) \
+do { \
+ a += G (b, c, d) + x + ac; \
+ a = ROTATE_LEFT (a, s); \
+ a += b; \
+} while (0)
+
+#define HH(a,b,c,d,x,s,ac) \
+do { \
+ a += H (b, c, d) + x + ac; \
+ a = ROTATE_LEFT (a, s); \
+ a += b; \
+} while (0)
+
+#define II(a,b,c,d,x,s,ac) \
+do { \
+ a += I (b, c, d) + x + ac; \
+ a = ROTATE_LEFT (a, s); \
+ a += b; \
+} while (0)
+
+#undef _
+
+/* MD5 basic transformation. Transforms state based on block. */
+static void
+md5_transform (md5_context_t * m, u32 * data, u32 * result, int zero_buffer)
+{
+ u32 a = m->state[0], b = m->state[1], c = m->state[2], d = m->state[3];
+ u32 *x = data;
+
+/* Constants for MD5Transform routine. */
+#define S11 7
+#define S12 12
+#define S13 17
+#define S14 22
+#define S21 5
+#define S22 9
+#define S23 14
+#define S24 20
+#define S31 4
+#define S32 11
+#define S33 16
+#define S34 23
+#define S41 6
+#define S42 10
+#define S43 15
+#define S44 21
+
+ /* Round 1 */
+ FF (a, b, c, d, clib_host_to_little_u32 (x[0]), S11, 0xd76aa478); /* 1 */
+ FF (d, a, b, c, clib_host_to_little_u32 (x[1]), S12, 0xe8c7b756); /* 2 */
+ FF (c, d, a, b, clib_host_to_little_u32 (x[2]), S13, 0x242070db); /* 3 */
+ FF (b, c, d, a, clib_host_to_little_u32 (x[3]), S14, 0xc1bdceee); /* 4 */
+ FF (a, b, c, d, clib_host_to_little_u32 (x[4]), S11, 0xf57c0faf); /* 5 */
+ FF (d, a, b, c, clib_host_to_little_u32 (x[5]), S12, 0x4787c62a); /* 6 */
+ FF (c, d, a, b, clib_host_to_little_u32 (x[6]), S13, 0xa8304613); /* 7 */
+ FF (b, c, d, a, clib_host_to_little_u32 (x[7]), S14, 0xfd469501); /* 8 */
+ FF (a, b, c, d, clib_host_to_little_u32 (x[8]), S11, 0x698098d8); /* 9 */
+ FF (d, a, b, c, clib_host_to_little_u32 (x[9]), S12, 0x8b44f7af); /* 10 */
+ FF (c, d, a, b, clib_host_to_little_u32 (x[10]), S13, 0xffff5bb1); /* 11 */
+ FF (b, c, d, a, clib_host_to_little_u32 (x[11]), S14, 0x895cd7be); /* 12 */
+ FF (a, b, c, d, clib_host_to_little_u32 (x[12]), S11, 0x6b901122); /* 13 */
+ FF (d, a, b, c, clib_host_to_little_u32 (x[13]), S12, 0xfd987193); /* 14 */
+ FF (c, d, a, b, clib_host_to_little_u32 (x[14]), S13, 0xa679438e); /* 15 */
+ FF (b, c, d, a, clib_host_to_little_u32 (x[15]), S14, 0x49b40821); /* 16 */
+
+ /* Round 2 */
+ GG (a, b, c, d, x[1], S21, 0xf61e2562); /* 17 */
+ GG (d, a, b, c, x[6], S22, 0xc040b340); /* 18 */
+ GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
+ GG (b, c, d, a, x[0], S24, 0xe9b6c7aa); /* 20 */
+ GG (a, b, c, d, x[5], S21, 0xd62f105d); /* 21 */
+ GG (d, a, b, c, x[10], S22, 0x02441453); /* 22 */
+ GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
+ GG (b, c, d, a, x[4], S24, 0xe7d3fbc8); /* 24 */
+ GG (a, b, c, d, x[9], S21, 0x21e1cde6); /* 25 */
+ GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
+ GG (c, d, a, b, x[3], S23, 0xf4d50d87); /* 27 */
+ GG (b, c, d, a, x[8], S24, 0x455a14ed); /* 28 */
+ GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
+ GG (d, a, b, c, x[2], S22, 0xfcefa3f8); /* 30 */
+ GG (c, d, a, b, x[7], S23, 0x676f02d9); /* 31 */
+ GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
+
+ /* Round 3 */
+ HH (a, b, c, d, x[5], S31, 0xfffa3942); /* 33 */
+ HH (d, a, b, c, x[8], S32, 0x8771f681); /* 34 */
+ HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
+ HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
+ HH (a, b, c, d, x[1], S31, 0xa4beea44); /* 37 */
+ HH (d, a, b, c, x[4], S32, 0x4bdecfa9); /* 38 */
+ HH (c, d, a, b, x[7], S33, 0xf6bb4b60); /* 39 */
+ HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
+ HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
+ HH (d, a, b, c, x[0], S32, 0xeaa127fa); /* 42 */
+ HH (c, d, a, b, x[3], S33, 0xd4ef3085); /* 43 */
+ HH (b, c, d, a, x[6], S34, 0x04881d05); /* 44 */
+ HH (a, b, c, d, x[9], S31, 0xd9d4d039); /* 45 */
+ HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
+ HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
+ HH (b, c, d, a, x[2], S34, 0xc4ac5665); /* 48 */
+
+ /* Round 4 */
+ II (a, b, c, d, x[0], S41, 0xf4292244); /* 49 */
+ II (d, a, b, c, x[7], S42, 0x432aff97); /* 50 */
+ II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
+ II (b, c, d, a, x[5], S44, 0xfc93a039); /* 52 */
+ II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
+ II (d, a, b, c, x[3], S42, 0x8f0ccc92); /* 54 */
+ II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
+ II (b, c, d, a, x[1], S44, 0x85845dd1); /* 56 */
+ II (a, b, c, d, x[8], S41, 0x6fa87e4f); /* 57 */
+ II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
+ II (c, d, a, b, x[6], S43, 0xa3014314); /* 59 */
+ II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
+ II (a, b, c, d, x[4], S41, 0xf7537e82); /* 61 */
+ II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
+ II (c, d, a, b, x[2], S43, 0x2ad7d2bb); /* 63 */
+ II (b, c, d, a, x[9], S44, 0xeb86d391); /* 64 */
+
+ a += m->state[0];
+ b += m->state[1];
+ c += m->state[2];
+ d += m->state[3];
+
+ if (result)
+ {
+ result[0] = clib_host_to_little_u32 (a);
+ result[1] = clib_host_to_little_u32 (b);
+ result[2] = clib_host_to_little_u32 (c);
+ result[3] = clib_host_to_little_u32 (d);
+ }
+ else
+ {
+ m->state[0] = a;
+ m->state[1] = b;
+ m->state[2] = c;
+ m->state[3] = d;
+ }
+
+ /* Zero sensitive information. */
+ if (result)
+ memset (m, ~0, sizeof (m[0]));
+ else if (zero_buffer)
+ memset (m->input_buffer.b8, 0, sizeof (m->input_buffer));
+}
+
+/* MD5 initialization. Begins an MD5 operation, writing a new context. */
+void
+md5_init (md5_context_t * c)
+{
+ memset (c, 0, sizeof (c[0]));
+
+ /* Load magic initialization constants. */
+ c->state[0] = 0x67452301;
+ c->state[1] = 0xefcdab89;
+ c->state[2] = 0x98badcfe;
+ c->state[3] = 0x10325476;
+}
+
+always_inline void __attribute__ ((unused))
+md5_fill_buffer_aligned (md5_context_t * c, u32 * d32)
+{
+ int i;
+ for (i = 0; i < ARRAY_LEN (c->input_buffer.b32); i++)
+ c->input_buffer.b32[i] = d32[i];
+}
+
+/* MD5 block update operation. Continues an MD5 message-digest
+ operation, processing another message block, and updating the
+ context.
+ */
+void
+md5_add (md5_context_t * c, void *data, int data_bytes)
+{
+ u32 data_bytes_left;
+ void *d;
+
+ if (data_bytes == 0)
+ return;
+
+ d = data;
+ data_bytes_left = data_bytes;
+
+ if ((pointer_to_uword (d) % sizeof (u32)) == 0
+ && (c->n_bits % BITS (c->input_buffer)) == 0
+ && data_bytes >= sizeof (c->input_buffer))
+ {
+ int is_last_iteration;
+ /* Fast aligned version. */
+ do
+ {
+ data_bytes_left -= sizeof (c->input_buffer);
+ is_last_iteration = data_bytes_left < sizeof (c->input_buffer);
+ md5_transform (c, d, /* result */ 0, /* zero_buffer */
+ is_last_iteration);
+ d += sizeof (c->input_buffer);
+ }
+ while (!is_last_iteration);
+ }
+
+ /* Slow unaligned version. */
+ {
+ int bi;
+ u8 *d8 = d;
+
+ bi = (c->n_bits / BITS (u8)) % ARRAY_LEN (c->input_buffer.b8);
+
+ while (data_bytes_left > 0)
+ {
+ c->input_buffer.b8[bi] = d8[0];
+ data_bytes_left -= 1;
+ d8++;
+ bi++;
+ if (bi == ARRAY_LEN (c->input_buffer.b8))
+ {
+ bi = 0;
+ md5_transform (c, c->input_buffer.b32,
+ /* result */ 0,
+ /* zero_buffer */ 1);
+ }
+ }
+ }
+
+ c->n_bits += data_bytes * BITS (u8);
+}
+
+void
+md5_finish (md5_context_t * c, u8 * digest)
+{
+ u64 n_bits_save;
+ int bi, n_pad;
+ static u8 padding[sizeof (c->input_buffer)] = { 0x80, 0, };
+
+ n_bits_save = c->n_bits;
+ bi = (n_bits_save / BITS (u8)) % ARRAY_LEN (c->input_buffer.b8);
+
+ n_pad = sizeof (c->input_buffer) - (bi + sizeof (u64));
+ if (n_pad <= 0)
+ n_pad += sizeof (c->input_buffer);
+ md5_add (c, padding, n_pad);
+
+ c->input_buffer.b64[ARRAY_LEN (c->input_buffer.b64) - 1]
+ = clib_host_to_little_u64 (n_bits_save);
+
+ md5_transform (c, c->input_buffer.b32, (u32 *) digest,
+ /* zero_buffer */ 1);
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */