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Diffstat (limited to 'src/vppinfra/md5.c')
| -rw-r--r-- | src/vppinfra/md5.c | 317 |
1 files changed, 317 insertions, 0 deletions
diff --git a/src/vppinfra/md5.c b/src/vppinfra/md5.c new file mode 100644 index 00000000..9ac1efc7 --- /dev/null +++ b/src/vppinfra/md5.c @@ -0,0 +1,317 @@ +/* + * 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: + */ |