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mirror_frr/lib/md5.c
David Lamparter acddc0ed3c *: auto-convert to SPDX License IDs 
Done with a combination of regex'ing and banging my head against a wall.

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
2023-02-09 14:09:11 +01:00

421 lines
11 KiB
C
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// SPDX-License-Identifier: BSD-3-Clause
/*
* Copyright (C) 2004 6WIND
* <Vincent.Jardin@6WIND.com>
* All rights reserved.
*
* This MD5 code is Big endian and Little Endian compatible.
*/
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* All rights reserved.
*/
#include <zebra.h>
#include "md5.h"
#define SHIFT(X, s) (((X) << (s)) | ((X) >> (32 - (s))))
#define F(X, Y, Z) (((X) & (Y)) | ((~X) & (Z)))
#define G(X, Y, Z) (((X) & (Z)) | ((Y) & (~Z)))
#define H(X, Y, Z) ((X) ^ (Y) ^ (Z))
#define I(X, Y, Z) ((Y) ^ ((X) | (~Z)))
#define ROUND1(a, b, c, d, k, s, i) \
{ \
(a) = (a) + F((b), (c), (d)) + X[(k)] + T[(i)]; \
(a) = SHIFT((a), (s)); \
(a) = (b) + (a); \
}
#define ROUND2(a, b, c, d, k, s, i) \
{ \
(a) = (a) + G((b), (c), (d)) + X[(k)] + T[(i)]; \
(a) = SHIFT((a), (s)); \
(a) = (b) + (a); \
}
#define ROUND3(a, b, c, d, k, s, i) \
{ \
(a) = (a) + H((b), (c), (d)) + X[(k)] + T[(i)]; \
(a) = SHIFT((a), (s)); \
(a) = (b) + (a); \
}
#define ROUND4(a, b, c, d, k, s, i) \
{ \
(a) = (a) + I((b), (c), (d)) + X[(k)] + T[(i)]; \
(a) = SHIFT((a), (s)); \
(a) = (b) + (a); \
}
#define Sa 7
#define Sb 12
#define Sc 17
#define Sd 22
#define Se 5
#define Sf 9
#define Sg 14
#define Sh 20
#define Si 4
#define Sj 11
#define Sk 16
#define Sl 23
#define Sm 6
#define Sn 10
#define So 15
#define Sp 21
#define MD5_A0 0x67452301
#define MD5_B0 0xefcdab89
#define MD5_C0 0x98badcfe
#define MD5_D0 0x10325476
/* Integer part of 4294967296 times abs(sin(i)), where i is in radians. */
static const uint32_t T[65] = {
0, 0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, 0xf57c0faf,
0x4787c62a, 0xa8304613, 0xfd469501, 0x698098d8, 0x8b44f7af, 0xffff5bb1,
0x895cd7be, 0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821,
0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa, 0xd62f105d, 0x2441453,
0xd8a1e681, 0xe7d3fbc8, 0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed,
0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a,
0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c, 0xa4beea44, 0x4bdecfa9,
0xf6bb4b60, 0xbebfbc70, 0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x4881d05,
0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665,
0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039, 0x655b59c3, 0x8f0ccc92,
0xffeff47d, 0x85845dd1, 0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1,
0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391,
};
static const uint8_t md5_paddat[MD5_BUFLEN] = {
0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
};
static void md5_calc(const uint8_t *, md5_ctxt *);
void md5_init(md5_ctxt *ctxt)
{
ctxt->md5_n = 0;
ctxt->md5_i = 0;
ctxt->md5_sta = MD5_A0;
ctxt->md5_stb = MD5_B0;
ctxt->md5_stc = MD5_C0;
ctxt->md5_std = MD5_D0;
memset(ctxt->md5_buf, 0, sizeof(ctxt->md5_buf));
}
void md5_loop(md5_ctxt *ctxt, const void *vinput, uint len)
{
uint gap, i;
const uint8_t *input = vinput;
ctxt->md5_n += len * 8; /* byte to bit */
gap = MD5_BUFLEN - ctxt->md5_i;
if (len >= gap) {
memcpy(ctxt->md5_buf + ctxt->md5_i, input, gap);
md5_calc(ctxt->md5_buf, ctxt);
for (i = gap; i + MD5_BUFLEN <= len; i += MD5_BUFLEN) {
md5_calc((input + i), ctxt);
}
ctxt->md5_i = len - i;
memcpy(ctxt->md5_buf, (input + i), ctxt->md5_i);
} else {
memcpy(ctxt->md5_buf + ctxt->md5_i, input, len);
ctxt->md5_i += len;
}
}
void md5_pad(md5_ctxt *ctxt)
{
uint gap;
/* Don't count up padding. Keep md5_n. */
gap = MD5_BUFLEN - ctxt->md5_i;
if (gap > 8) {
memcpy(ctxt->md5_buf + ctxt->md5_i, md5_paddat,
gap - sizeof(ctxt->md5_n));
} else {
/* including gap == 8 */
memcpy(ctxt->md5_buf + ctxt->md5_i, md5_paddat, gap);
md5_calc(ctxt->md5_buf, ctxt);
memcpy(ctxt->md5_buf, md5_paddat + gap,
MD5_BUFLEN - sizeof(ctxt->md5_n));
}
/* 8 byte word */
if (BYTE_ORDER == LITTLE_ENDIAN)
memcpy(&ctxt->md5_buf[56], &ctxt->md5_n8[0], 8);
else {
ctxt->md5_buf[56] = ctxt->md5_n8[7];
ctxt->md5_buf[57] = ctxt->md5_n8[6];
ctxt->md5_buf[58] = ctxt->md5_n8[5];
ctxt->md5_buf[59] = ctxt->md5_n8[4];
ctxt->md5_buf[60] = ctxt->md5_n8[3];
ctxt->md5_buf[61] = ctxt->md5_n8[2];
ctxt->md5_buf[62] = ctxt->md5_n8[1];
ctxt->md5_buf[63] = ctxt->md5_n8[0];
}
md5_calc(ctxt->md5_buf, ctxt);
}
void md5_result(uint8_t *digest, md5_ctxt *ctxt)
{
/* 4 byte words */
if (BYTE_ORDER == LITTLE_ENDIAN)
memcpy(digest, &ctxt->md5_st8[0], 16);
else if (BYTE_ORDER == BIG_ENDIAN) {
digest[0] = ctxt->md5_st8[3];
digest[1] = ctxt->md5_st8[2];
digest[2] = ctxt->md5_st8[1];
digest[3] = ctxt->md5_st8[0];
digest[4] = ctxt->md5_st8[7];
digest[5] = ctxt->md5_st8[6];
digest[6] = ctxt->md5_st8[5];
digest[7] = ctxt->md5_st8[4];
digest[8] = ctxt->md5_st8[11];
digest[9] = ctxt->md5_st8[10];
digest[10] = ctxt->md5_st8[9];
digest[11] = ctxt->md5_st8[8];
digest[12] = ctxt->md5_st8[15];
digest[13] = ctxt->md5_st8[14];
digest[14] = ctxt->md5_st8[13];
digest[15] = ctxt->md5_st8[12];
}
}
static void md5_calc(const uint8_t *b64, md5_ctxt *ctxt)
{
uint32_t A = ctxt->md5_sta;
uint32_t B = ctxt->md5_stb;
uint32_t C = ctxt->md5_stc;
uint32_t D = ctxt->md5_std;
#if (BYTE_ORDER == LITTLE_ENDIAN)
const uint32_t *X = (const uint32_t *)b64;
#elif (BYTE_ORDER == BIG_ENDIAN)
uint32_t X[16];
if (BYTE_ORDER == BIG_ENDIAN) {
/* 4 byte words */
/* what a brute force but fast! */
uint8_t *y = (uint8_t *)X;
y[0] = b64[3];
y[1] = b64[2];
y[2] = b64[1];
y[3] = b64[0];
y[4] = b64[7];
y[5] = b64[6];
y[6] = b64[5];
y[7] = b64[4];
y[8] = b64[11];
y[9] = b64[10];
y[10] = b64[9];
y[11] = b64[8];
y[12] = b64[15];
y[13] = b64[14];
y[14] = b64[13];
y[15] = b64[12];
y[16] = b64[19];
y[17] = b64[18];
y[18] = b64[17];
y[19] = b64[16];
y[20] = b64[23];
y[21] = b64[22];
y[22] = b64[21];
y[23] = b64[20];
y[24] = b64[27];
y[25] = b64[26];
y[26] = b64[25];
y[27] = b64[24];
y[28] = b64[31];
y[29] = b64[30];
y[30] = b64[29];
y[31] = b64[28];
y[32] = b64[35];
y[33] = b64[34];
y[34] = b64[33];
y[35] = b64[32];
y[36] = b64[39];
y[37] = b64[38];
y[38] = b64[37];
y[39] = b64[36];
y[40] = b64[43];
y[41] = b64[42];
y[42] = b64[41];
y[43] = b64[40];
y[44] = b64[47];
y[45] = b64[46];
y[46] = b64[45];
y[47] = b64[44];
y[48] = b64[51];
y[49] = b64[50];
y[50] = b64[49];
y[51] = b64[48];
y[52] = b64[55];
y[53] = b64[54];
y[54] = b64[53];
y[55] = b64[52];
y[56] = b64[59];
y[57] = b64[58];
y[58] = b64[57];
y[59] = b64[56];
y[60] = b64[63];
y[61] = b64[62];
y[62] = b64[61];
y[63] = b64[60];
}
#endif
ROUND1(A, B, C, D, 0, Sa, 1);
ROUND1(D, A, B, C, 1, Sb, 2);
ROUND1(C, D, A, B, 2, Sc, 3);
ROUND1(B, C, D, A, 3, Sd, 4);
ROUND1(A, B, C, D, 4, Sa, 5);
ROUND1(D, A, B, C, 5, Sb, 6);
ROUND1(C, D, A, B, 6, Sc, 7);
ROUND1(B, C, D, A, 7, Sd, 8);
ROUND1(A, B, C, D, 8, Sa, 9);
ROUND1(D, A, B, C, 9, Sb, 10);
ROUND1(C, D, A, B, 10, Sc, 11);
ROUND1(B, C, D, A, 11, Sd, 12);
ROUND1(A, B, C, D, 12, Sa, 13);
ROUND1(D, A, B, C, 13, Sb, 14);
ROUND1(C, D, A, B, 14, Sc, 15);
ROUND1(B, C, D, A, 15, Sd, 16);
ROUND2(A, B, C, D, 1, Se, 17);
ROUND2(D, A, B, C, 6, Sf, 18);
ROUND2(C, D, A, B, 11, Sg, 19);
ROUND2(B, C, D, A, 0, Sh, 20);
ROUND2(A, B, C, D, 5, Se, 21);
ROUND2(D, A, B, C, 10, Sf, 22);
ROUND2(C, D, A, B, 15, Sg, 23);
ROUND2(B, C, D, A, 4, Sh, 24);
ROUND2(A, B, C, D, 9, Se, 25);
ROUND2(D, A, B, C, 14, Sf, 26);
ROUND2(C, D, A, B, 3, Sg, 27);
ROUND2(B, C, D, A, 8, Sh, 28);
ROUND2(A, B, C, D, 13, Se, 29);
ROUND2(D, A, B, C, 2, Sf, 30);
ROUND2(C, D, A, B, 7, Sg, 31);
ROUND2(B, C, D, A, 12, Sh, 32);
ROUND3(A, B, C, D, 5, Si, 33);
ROUND3(D, A, B, C, 8, Sj, 34);
ROUND3(C, D, A, B, 11, Sk, 35);
ROUND3(B, C, D, A, 14, Sl, 36);
ROUND3(A, B, C, D, 1, Si, 37);
ROUND3(D, A, B, C, 4, Sj, 38);
ROUND3(C, D, A, B, 7, Sk, 39);
ROUND3(B, C, D, A, 10, Sl, 40);
ROUND3(A, B, C, D, 13, Si, 41);
ROUND3(D, A, B, C, 0, Sj, 42);
ROUND3(C, D, A, B, 3, Sk, 43);
ROUND3(B, C, D, A, 6, Sl, 44);
ROUND3(A, B, C, D, 9, Si, 45);
ROUND3(D, A, B, C, 12, Sj, 46);
ROUND3(C, D, A, B, 15, Sk, 47);
ROUND3(B, C, D, A, 2, Sl, 48);
ROUND4(A, B, C, D, 0, Sm, 49);
ROUND4(D, A, B, C, 7, Sn, 50);
ROUND4(C, D, A, B, 14, So, 51);
ROUND4(B, C, D, A, 5, Sp, 52);
ROUND4(A, B, C, D, 12, Sm, 53);
ROUND4(D, A, B, C, 3, Sn, 54);
ROUND4(C, D, A, B, 10, So, 55);
ROUND4(B, C, D, A, 1, Sp, 56);
ROUND4(A, B, C, D, 8, Sm, 57);
ROUND4(D, A, B, C, 15, Sn, 58);
ROUND4(C, D, A, B, 6, So, 59);
ROUND4(B, C, D, A, 13, Sp, 60);
ROUND4(A, B, C, D, 4, Sm, 61);
ROUND4(D, A, B, C, 11, Sn, 62);
ROUND4(C, D, A, B, 2, So, 63);
ROUND4(B, C, D, A, 9, Sp, 64);
ctxt->md5_sta += A;
ctxt->md5_stb += B;
ctxt->md5_stc += C;
ctxt->md5_std += D;
}
/* From RFC 2104 */
void hmac_md5(unsigned char *text, int text_len, unsigned char *key,
int key_len, uint8_t *digest)
{
MD5_CTX context;
unsigned char k_ipad[65]; /* inner padding -
* key XORd with ipad
*/
unsigned char k_opad[65]; /* outer padding -
* key XORd with opad
*/
unsigned char tk[16];
int i;
/* if key is longer than 64 bytes reset it to key=MD5(key) */
if (key_len > 64) {
MD5_CTX tctx;
MD5Init(&tctx);
MD5Update(&tctx, key, key_len);
MD5Final(tk, &tctx);
key = tk;
key_len = 16;
}
/*
* the HMAC_MD5 transform looks like:
*
* MD5(K XOR opad, MD5(K XOR ipad, text))
*
* where K is an n byte key
* ipad is the byte 0x36 repeated 64 times
* opad is the byte 0x5c repeated 64 times
* and text is the data being protected
*/
/* start out by storing key in pads */
bzero(k_ipad, sizeof(k_ipad));
bzero(k_opad, sizeof(k_opad));
bcopy(key, k_ipad, key_len);
bcopy(key, k_opad, key_len);
/* XOR key with ipad and opad values */
for (i = 0; i < 64; i++) {
k_ipad[i] ^= 0x36;
k_opad[i] ^= 0x5c;
}
/*
* perform inner MD5
*/
MD5Init(&context); /* init context for 1st
* pass */
MD5Update(&context, k_ipad, 64); /* start with inner pad */
MD5Update(&context, text, text_len); /* then text of datagram */
MD5Final(digest, &context); /* finish up 1st pass */
/*
* perform outer MD5
*/
MD5Init(&context); /* init context for 2nd
* pass */
MD5Update(&context, k_opad, 64); /* start with outer pad */
MD5Update(&context, digest, 16); /* then results of 1st
* hash */
MD5Final(digest, &context); /* finish up 2nd pass */
explicit_bzero(&context, sizeof(context));
}
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