| /* |
| * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved. |
| * |
| * Licensed under the Apache License 2.0 (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 |
| */ |
| |
| /*- |
| * set_key.c v 1.4 eay 24/9/91 |
| * 1.4 Speed up by 400% :-) |
| * 1.3 added register declarations. |
| * 1.2 unrolled make_key_sched a bit more |
| * 1.1 added norm_expand_bits |
| * 1.0 First working version |
| */ |
| |
| /* |
| * DES low level APIs are deprecated for public use, but still ok for internal |
| * use. |
| */ |
| #include "internal/deprecated.h" |
| |
| #include <openssl/crypto.h> |
| #include "internal/constant_time.h" |
| #include "internal/nelem.h" |
| #include "des_local.h" |
| |
| static const unsigned char odd_parity[256] = { |
| 1, 1, 2, 2, 4, 4, 7, 7, 8, 8, 11, 11, 13, 13, 14, 14, |
| 16, 16, 19, 19, 21, 21, 22, 22, 25, 25, 26, 26, 28, 28, 31, 31, |
| 32, 32, 35, 35, 37, 37, 38, 38, 41, 41, 42, 42, 44, 44, 47, 47, |
| 49, 49, 50, 50, 52, 52, 55, 55, 56, 56, 59, 59, 61, 61, 62, 62, |
| 64, 64, 67, 67, 69, 69, 70, 70, 73, 73, 74, 74, 76, 76, 79, 79, |
| 81, 81, 82, 82, 84, 84, 87, 87, 88, 88, 91, 91, 93, 93, 94, 94, |
| 97, 97, 98, 98, 100, 100, 103, 103, 104, 104, 107, 107, 109, 109, 110, |
| 110, |
| 112, 112, 115, 115, 117, 117, 118, 118, 121, 121, 122, 122, 124, 124, 127, |
| 127, |
| 128, 128, 131, 131, 133, 133, 134, 134, 137, 137, 138, 138, 140, 140, 143, |
| 143, |
| 145, 145, 146, 146, 148, 148, 151, 151, 152, 152, 155, 155, 157, 157, 158, |
| 158, |
| 161, 161, 162, 162, 164, 164, 167, 167, 168, 168, 171, 171, 173, 173, 174, |
| 174, |
| 176, 176, 179, 179, 181, 181, 182, 182, 185, 185, 186, 186, 188, 188, 191, |
| 191, |
| 193, 193, 194, 194, 196, 196, 199, 199, 200, 200, 203, 203, 205, 205, 206, |
| 206, |
| 208, 208, 211, 211, 213, 213, 214, 214, 217, 217, 218, 218, 220, 220, 223, |
| 223, |
| 224, 224, 227, 227, 229, 229, 230, 230, 233, 233, 234, 234, 236, 236, 239, |
| 239, |
| 241, 241, 242, 242, 244, 244, 247, 247, 248, 248, 251, 251, 253, 253, 254, |
| 254 |
| }; |
| |
| void DES_set_odd_parity(DES_cblock *key) |
| { |
| unsigned int i; |
| |
| for (i = 0; i < DES_KEY_SZ; i++) |
| (*key)[i] = odd_parity[(*key)[i]]; |
| } |
| |
| /* |
| * Check that a key has the correct parity. |
| * Return 1 if parity is okay and 0 if not. |
| */ |
| int DES_check_key_parity(const_DES_cblock *key) |
| { |
| unsigned int i; |
| unsigned char res = 0377, b; |
| |
| for (i = 0; i < DES_KEY_SZ; i++) { |
| b = (*key)[i]; |
| b ^= b >> 4; |
| b ^= b >> 2; |
| b ^= b >> 1; |
| res &= constant_time_eq_8(b & 1, 1); |
| } |
| return (int)(res & 1); |
| } |
| |
| /*- |
| * Weak and semi weak keys as taken from |
| * %A D.W. Davies |
| * %A W.L. Price |
| * %T Security for Computer Networks |
| * %I John Wiley & Sons |
| * %D 1984 |
| */ |
| static const DES_cblock weak_keys[] = { |
| /* weak keys */ |
| {0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01}, |
| {0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE}, |
| {0x1F, 0x1F, 0x1F, 0x1F, 0x0E, 0x0E, 0x0E, 0x0E}, |
| {0xE0, 0xE0, 0xE0, 0xE0, 0xF1, 0xF1, 0xF1, 0xF1}, |
| /* semi-weak keys */ |
| {0x01, 0xFE, 0x01, 0xFE, 0x01, 0xFE, 0x01, 0xFE}, |
| {0xFE, 0x01, 0xFE, 0x01, 0xFE, 0x01, 0xFE, 0x01}, |
| {0x1F, 0xE0, 0x1F, 0xE0, 0x0E, 0xF1, 0x0E, 0xF1}, |
| {0xE0, 0x1F, 0xE0, 0x1F, 0xF1, 0x0E, 0xF1, 0x0E}, |
| {0x01, 0xE0, 0x01, 0xE0, 0x01, 0xF1, 0x01, 0xF1}, |
| {0xE0, 0x01, 0xE0, 0x01, 0xF1, 0x01, 0xF1, 0x01}, |
| {0x1F, 0xFE, 0x1F, 0xFE, 0x0E, 0xFE, 0x0E, 0xFE}, |
| {0xFE, 0x1F, 0xFE, 0x1F, 0xFE, 0x0E, 0xFE, 0x0E}, |
| {0x01, 0x1F, 0x01, 0x1F, 0x01, 0x0E, 0x01, 0x0E}, |
| {0x1F, 0x01, 0x1F, 0x01, 0x0E, 0x01, 0x0E, 0x01}, |
| {0xE0, 0xFE, 0xE0, 0xFE, 0xF1, 0xFE, 0xF1, 0xFE}, |
| {0xFE, 0xE0, 0xFE, 0xE0, 0xFE, 0xF1, 0xFE, 0xF1} |
| }; |
| |
| /* |
| * Check for weak keys. |
| * Return 1 if the key is weak and 0 otherwise. |
| */ |
| int DES_is_weak_key(const_DES_cblock *key) |
| { |
| unsigned int i, res = 0; |
| int j; |
| |
| for (i = 0; i < OSSL_NELEM(weak_keys); i++) { |
| j = CRYPTO_memcmp(weak_keys[i], key, sizeof(DES_cblock)); |
| res |= constant_time_is_zero((unsigned int)j); |
| } |
| return (int)(res & 1); |
| } |
| |
| /*- |
| * NOW DEFINED IN des_local.h |
| * See ecb_encrypt.c for a pseudo description of these macros. |
| * #define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\ |
| * (b)^=(t),\ |
| * (a)=((a)^((t)<<(n)))) |
| */ |
| |
| #define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\ |
| (a)=(a)^(t)^(t>>(16-(n)))) |
| |
| static const DES_LONG des_skb[8][64] = { |
| { |
| /* for C bits (numbered as per FIPS 46) 1 2 3 4 5 6 */ |
| 0x00000000L, 0x00000010L, 0x20000000L, 0x20000010L, |
| 0x00010000L, 0x00010010L, 0x20010000L, 0x20010010L, |
| 0x00000800L, 0x00000810L, 0x20000800L, 0x20000810L, |
| 0x00010800L, 0x00010810L, 0x20010800L, 0x20010810L, |
| 0x00000020L, 0x00000030L, 0x20000020L, 0x20000030L, |
| 0x00010020L, 0x00010030L, 0x20010020L, 0x20010030L, |
| 0x00000820L, 0x00000830L, 0x20000820L, 0x20000830L, |
| 0x00010820L, 0x00010830L, 0x20010820L, 0x20010830L, |
| 0x00080000L, 0x00080010L, 0x20080000L, 0x20080010L, |
| 0x00090000L, 0x00090010L, 0x20090000L, 0x20090010L, |
| 0x00080800L, 0x00080810L, 0x20080800L, 0x20080810L, |
| 0x00090800L, 0x00090810L, 0x20090800L, 0x20090810L, |
| 0x00080020L, 0x00080030L, 0x20080020L, 0x20080030L, |
| 0x00090020L, 0x00090030L, 0x20090020L, 0x20090030L, |
| 0x00080820L, 0x00080830L, 0x20080820L, 0x20080830L, |
| 0x00090820L, 0x00090830L, 0x20090820L, 0x20090830L, |
| }, |
| { |
| /* for C bits (numbered as per FIPS 46) 7 8 10 11 12 13 */ |
| 0x00000000L, 0x02000000L, 0x00002000L, 0x02002000L, |
| 0x00200000L, 0x02200000L, 0x00202000L, 0x02202000L, |
| 0x00000004L, 0x02000004L, 0x00002004L, 0x02002004L, |
| 0x00200004L, 0x02200004L, 0x00202004L, 0x02202004L, |
| 0x00000400L, 0x02000400L, 0x00002400L, 0x02002400L, |
| 0x00200400L, 0x02200400L, 0x00202400L, 0x02202400L, |
| 0x00000404L, 0x02000404L, 0x00002404L, 0x02002404L, |
| 0x00200404L, 0x02200404L, 0x00202404L, 0x02202404L, |
| 0x10000000L, 0x12000000L, 0x10002000L, 0x12002000L, |
| 0x10200000L, 0x12200000L, 0x10202000L, 0x12202000L, |
| 0x10000004L, 0x12000004L, 0x10002004L, 0x12002004L, |
| 0x10200004L, 0x12200004L, 0x10202004L, 0x12202004L, |
| 0x10000400L, 0x12000400L, 0x10002400L, 0x12002400L, |
| 0x10200400L, 0x12200400L, 0x10202400L, 0x12202400L, |
| 0x10000404L, 0x12000404L, 0x10002404L, 0x12002404L, |
| 0x10200404L, 0x12200404L, 0x10202404L, 0x12202404L, |
| }, |
| { |
| /* for C bits (numbered as per FIPS 46) 14 15 16 17 19 20 */ |
| 0x00000000L, 0x00000001L, 0x00040000L, 0x00040001L, |
| 0x01000000L, 0x01000001L, 0x01040000L, 0x01040001L, |
| 0x00000002L, 0x00000003L, 0x00040002L, 0x00040003L, |
| 0x01000002L, 0x01000003L, 0x01040002L, 0x01040003L, |
| 0x00000200L, 0x00000201L, 0x00040200L, 0x00040201L, |
| 0x01000200L, 0x01000201L, 0x01040200L, 0x01040201L, |
| 0x00000202L, 0x00000203L, 0x00040202L, 0x00040203L, |
| 0x01000202L, 0x01000203L, 0x01040202L, 0x01040203L, |
| 0x08000000L, 0x08000001L, 0x08040000L, 0x08040001L, |
| 0x09000000L, 0x09000001L, 0x09040000L, 0x09040001L, |
| 0x08000002L, 0x08000003L, 0x08040002L, 0x08040003L, |
| 0x09000002L, 0x09000003L, 0x09040002L, 0x09040003L, |
| 0x08000200L, 0x08000201L, 0x08040200L, 0x08040201L, |
| 0x09000200L, 0x09000201L, 0x09040200L, 0x09040201L, |
| 0x08000202L, 0x08000203L, 0x08040202L, 0x08040203L, |
| 0x09000202L, 0x09000203L, 0x09040202L, 0x09040203L, |
| }, |
| { |
| /* for C bits (numbered as per FIPS 46) 21 23 24 26 27 28 */ |
| 0x00000000L, 0x00100000L, 0x00000100L, 0x00100100L, |
| 0x00000008L, 0x00100008L, 0x00000108L, 0x00100108L, |
| 0x00001000L, 0x00101000L, 0x00001100L, 0x00101100L, |
| 0x00001008L, 0x00101008L, 0x00001108L, 0x00101108L, |
| 0x04000000L, 0x04100000L, 0x04000100L, 0x04100100L, |
| 0x04000008L, 0x04100008L, 0x04000108L, 0x04100108L, |
| 0x04001000L, 0x04101000L, 0x04001100L, 0x04101100L, |
| 0x04001008L, 0x04101008L, 0x04001108L, 0x04101108L, |
| 0x00020000L, 0x00120000L, 0x00020100L, 0x00120100L, |
| 0x00020008L, 0x00120008L, 0x00020108L, 0x00120108L, |
| 0x00021000L, 0x00121000L, 0x00021100L, 0x00121100L, |
| 0x00021008L, 0x00121008L, 0x00021108L, 0x00121108L, |
| 0x04020000L, 0x04120000L, 0x04020100L, 0x04120100L, |
| 0x04020008L, 0x04120008L, 0x04020108L, 0x04120108L, |
| 0x04021000L, 0x04121000L, 0x04021100L, 0x04121100L, |
| 0x04021008L, 0x04121008L, 0x04021108L, 0x04121108L, |
| }, |
| { |
| /* for D bits (numbered as per FIPS 46) 1 2 3 4 5 6 */ |
| 0x00000000L, 0x10000000L, 0x00010000L, 0x10010000L, |
| 0x00000004L, 0x10000004L, 0x00010004L, 0x10010004L, |
| 0x20000000L, 0x30000000L, 0x20010000L, 0x30010000L, |
| 0x20000004L, 0x30000004L, 0x20010004L, 0x30010004L, |
| 0x00100000L, 0x10100000L, 0x00110000L, 0x10110000L, |
| 0x00100004L, 0x10100004L, 0x00110004L, 0x10110004L, |
| 0x20100000L, 0x30100000L, 0x20110000L, 0x30110000L, |
| 0x20100004L, 0x30100004L, 0x20110004L, 0x30110004L, |
| 0x00001000L, 0x10001000L, 0x00011000L, 0x10011000L, |
| 0x00001004L, 0x10001004L, 0x00011004L, 0x10011004L, |
| 0x20001000L, 0x30001000L, 0x20011000L, 0x30011000L, |
| 0x20001004L, 0x30001004L, 0x20011004L, 0x30011004L, |
| 0x00101000L, 0x10101000L, 0x00111000L, 0x10111000L, |
| 0x00101004L, 0x10101004L, 0x00111004L, 0x10111004L, |
| 0x20101000L, 0x30101000L, 0x20111000L, 0x30111000L, |
| 0x20101004L, 0x30101004L, 0x20111004L, 0x30111004L, |
| }, |
| { |
| /* for D bits (numbered as per FIPS 46) 8 9 11 12 13 14 */ |
| 0x00000000L, 0x08000000L, 0x00000008L, 0x08000008L, |
| 0x00000400L, 0x08000400L, 0x00000408L, 0x08000408L, |
| 0x00020000L, 0x08020000L, 0x00020008L, 0x08020008L, |
| 0x00020400L, 0x08020400L, 0x00020408L, 0x08020408L, |
| 0x00000001L, 0x08000001L, 0x00000009L, 0x08000009L, |
| 0x00000401L, 0x08000401L, 0x00000409L, 0x08000409L, |
| 0x00020001L, 0x08020001L, 0x00020009L, 0x08020009L, |
| 0x00020401L, 0x08020401L, 0x00020409L, 0x08020409L, |
| 0x02000000L, 0x0A000000L, 0x02000008L, 0x0A000008L, |
| 0x02000400L, 0x0A000400L, 0x02000408L, 0x0A000408L, |
| 0x02020000L, 0x0A020000L, 0x02020008L, 0x0A020008L, |
| 0x02020400L, 0x0A020400L, 0x02020408L, 0x0A020408L, |
| 0x02000001L, 0x0A000001L, 0x02000009L, 0x0A000009L, |
| 0x02000401L, 0x0A000401L, 0x02000409L, 0x0A000409L, |
| 0x02020001L, 0x0A020001L, 0x02020009L, 0x0A020009L, |
| 0x02020401L, 0x0A020401L, 0x02020409L, 0x0A020409L, |
| }, |
| { |
| /* for D bits (numbered as per FIPS 46) 16 17 18 19 20 21 */ |
| 0x00000000L, 0x00000100L, 0x00080000L, 0x00080100L, |
| 0x01000000L, 0x01000100L, 0x01080000L, 0x01080100L, |
| 0x00000010L, 0x00000110L, 0x00080010L, 0x00080110L, |
| 0x01000010L, 0x01000110L, 0x01080010L, 0x01080110L, |
| 0x00200000L, 0x00200100L, 0x00280000L, 0x00280100L, |
| 0x01200000L, 0x01200100L, 0x01280000L, 0x01280100L, |
| 0x00200010L, 0x00200110L, 0x00280010L, 0x00280110L, |
| 0x01200010L, 0x01200110L, 0x01280010L, 0x01280110L, |
| 0x00000200L, 0x00000300L, 0x00080200L, 0x00080300L, |
| 0x01000200L, 0x01000300L, 0x01080200L, 0x01080300L, |
| 0x00000210L, 0x00000310L, 0x00080210L, 0x00080310L, |
| 0x01000210L, 0x01000310L, 0x01080210L, 0x01080310L, |
| 0x00200200L, 0x00200300L, 0x00280200L, 0x00280300L, |
| 0x01200200L, 0x01200300L, 0x01280200L, 0x01280300L, |
| 0x00200210L, 0x00200310L, 0x00280210L, 0x00280310L, |
| 0x01200210L, 0x01200310L, 0x01280210L, 0x01280310L, |
| }, |
| { |
| /* for D bits (numbered as per FIPS 46) 22 23 24 25 27 28 */ |
| 0x00000000L, 0x04000000L, 0x00040000L, 0x04040000L, |
| 0x00000002L, 0x04000002L, 0x00040002L, 0x04040002L, |
| 0x00002000L, 0x04002000L, 0x00042000L, 0x04042000L, |
| 0x00002002L, 0x04002002L, 0x00042002L, 0x04042002L, |
| 0x00000020L, 0x04000020L, 0x00040020L, 0x04040020L, |
| 0x00000022L, 0x04000022L, 0x00040022L, 0x04040022L, |
| 0x00002020L, 0x04002020L, 0x00042020L, 0x04042020L, |
| 0x00002022L, 0x04002022L, 0x00042022L, 0x04042022L, |
| 0x00000800L, 0x04000800L, 0x00040800L, 0x04040800L, |
| 0x00000802L, 0x04000802L, 0x00040802L, 0x04040802L, |
| 0x00002800L, 0x04002800L, 0x00042800L, 0x04042800L, |
| 0x00002802L, 0x04002802L, 0x00042802L, 0x04042802L, |
| 0x00000820L, 0x04000820L, 0x00040820L, 0x04040820L, |
| 0x00000822L, 0x04000822L, 0x00040822L, 0x04040822L, |
| 0x00002820L, 0x04002820L, 0x00042820L, 0x04042820L, |
| 0x00002822L, 0x04002822L, 0x00042822L, 0x04042822L, |
| } |
| }; |
| |
| /* Return values as DES_set_key_checked() but always set the key */ |
| int DES_set_key(const_DES_cblock *key, DES_key_schedule *schedule) |
| { |
| int ret = 0; |
| |
| if (!DES_check_key_parity(key)) |
| ret = -1; |
| if (DES_is_weak_key(key)) |
| ret = -2; |
| DES_set_key_unchecked(key, schedule); |
| return ret; |
| } |
| |
| /*- |
| * return 0 if key parity is odd (correct), |
| * return -1 if key parity error, |
| * return -2 if illegal weak key. |
| */ |
| int DES_set_key_checked(const_DES_cblock *key, DES_key_schedule *schedule) |
| { |
| if (!DES_check_key_parity(key)) |
| return -1; |
| if (DES_is_weak_key(key)) |
| return -2; |
| DES_set_key_unchecked(key, schedule); |
| return 0; |
| } |
| |
| void DES_set_key_unchecked(const_DES_cblock *key, DES_key_schedule *schedule) |
| { |
| static const int shifts2[16] = |
| { 0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0 }; |
| register DES_LONG c, d, t, s, t2; |
| register const unsigned char *in; |
| register DES_LONG *k; |
| register int i; |
| |
| #ifdef OPENBSD_DEV_CRYPTO |
| memcpy(schedule->key, key, sizeof(schedule->key)); |
| schedule->session = NULL; |
| #endif |
| k = &schedule->ks->deslong[0]; |
| in = &(*key)[0]; |
| |
| c2l(in, c); |
| c2l(in, d); |
| |
| /* |
| * do PC1 in 47 simple operations. Thanks to John Fletcher |
| * for the inspiration. |
| */ |
| PERM_OP(d, c, t, 4, 0x0f0f0f0fL); |
| HPERM_OP(c, t, -2, 0xcccc0000L); |
| HPERM_OP(d, t, -2, 0xcccc0000L); |
| PERM_OP(d, c, t, 1, 0x55555555L); |
| PERM_OP(c, d, t, 8, 0x00ff00ffL); |
| PERM_OP(d, c, t, 1, 0x55555555L); |
| d = (((d & 0x000000ffL) << 16L) | (d & 0x0000ff00L) | |
| ((d & 0x00ff0000L) >> 16L) | ((c & 0xf0000000L) >> 4L)); |
| c &= 0x0fffffffL; |
| |
| for (i = 0; i < ITERATIONS; i++) { |
| if (shifts2[i]) { |
| c = ((c >> 2L) | (c << 26L)); |
| d = ((d >> 2L) | (d << 26L)); |
| } else { |
| c = ((c >> 1L) | (c << 27L)); |
| d = ((d >> 1L) | (d << 27L)); |
| } |
| c &= 0x0fffffffL; |
| d &= 0x0fffffffL; |
| /* |
| * could be a few less shifts but I am to lazy at this point in time |
| * to investigate |
| */ |
| s = des_skb[0][(c) & 0x3f] | |
| des_skb[1][((c >> 6L) & 0x03) | ((c >> 7L) & 0x3c)] | |
| des_skb[2][((c >> 13L) & 0x0f) | ((c >> 14L) & 0x30)] | |
| des_skb[3][((c >> 20L) & 0x01) | ((c >> 21L) & 0x06) | |
| ((c >> 22L) & 0x38)]; |
| t = des_skb[4][(d) & 0x3f] | |
| des_skb[5][((d >> 7L) & 0x03) | ((d >> 8L) & 0x3c)] | |
| des_skb[6][(d >> 15L) & 0x3f] | |
| des_skb[7][((d >> 21L) & 0x0f) | ((d >> 22L) & 0x30)]; |
| |
| /* table contained 0213 4657 */ |
| t2 = ((t << 16L) | (s & 0x0000ffffL)) & 0xffffffffL; |
| *(k++) = ROTATE(t2, 30) & 0xffffffffL; |
| |
| t2 = ((s >> 16L) | (t & 0xffff0000L)); |
| *(k++) = ROTATE(t2, 26) & 0xffffffffL; |
| } |
| } |
| |
| int DES_key_sched(const_DES_cblock *key, DES_key_schedule *schedule) |
| { |
| return DES_set_key(key, schedule); |
| } |
