further encrypt_des optimizations
function old new delta pw_encrypt 943 964 +21 des_crypt 1512 1509 -3 u_sbox 512 256 -256 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 1/2 up/down: 21/-259) Total: -238 bytes
This commit is contained in:
Denis Vlasenko
parent
04087c6bbd
commit
5cdc247ba4
@ -56,6 +56,14 @@
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* alignment).
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*/
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/* Parts busybox doesn't need or had optimized */
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#define USE_PRECOMPUTED_u_sbox 1
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#define USE_REPETITIVE_SPEEDUP 0
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#define USE_ip_mask 0
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#define USE_de_keys 0
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/* A pile of data */
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static const uint8_t IP[64] = {
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58, 50, 42, 34, 26, 18, 10, 2, 60, 52, 44, 36, 28, 20, 12, 4,
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@ -85,57 +93,93 @@ static const uint8_t comp_perm[48] = {
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/*
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* No E box is used, as it's replaced by some ANDs, shifts, and ORs.
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*/
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#if !USE_PRECOMPUTED_u_sbox
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static const uint8_t sbox[8][64] = {
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{
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14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7,
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{ 14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7,
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0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8,
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4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0,
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15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13
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},
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{
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15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10,
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{ 15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10,
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3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5,
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0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15,
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13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9
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},
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{
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10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8,
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{ 10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8,
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13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1,
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13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7,
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1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12
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},
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{
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7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15,
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{ 7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15,
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13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9,
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10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4,
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3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14
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},
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{
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2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9,
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{ 2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9,
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14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6,
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4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14,
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11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3
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},
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{
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12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11,
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{ 12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11,
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10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8,
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9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6,
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4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13
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},
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{
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4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1,
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{ 4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1,
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13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6,
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1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2,
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6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12
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},
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{
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13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7,
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{ 13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7,
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1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2,
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7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8,
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2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11
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}
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};
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#else /* precomputed, with half-bytes packed into one byte */
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static const uint8_t u_sbox[8][32] = {
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{ 0x0e, 0xf4, 0x7d, 0x41, 0xe2, 0x2f, 0xdb, 0x18,
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0xa3, 0x6a, 0xc6, 0xbc, 0x95, 0x59, 0x30, 0x87,
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0xf4, 0xc1, 0x8e, 0x28, 0x4d, 0x96, 0x12, 0x7b,
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0x5f, 0xbc, 0x39, 0xe7, 0xa3, 0x0a, 0x65, 0xd0,
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},
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{ 0x3f, 0xd1, 0x48, 0x7e, 0xf6, 0x2b, 0x83, 0xe4,
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0xc9, 0x07, 0x12, 0xad, 0x6c, 0x90, 0xb5, 0x5a,
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0xd0, 0x8e, 0xa7, 0x1b, 0x3a, 0xf4, 0x4d, 0x21,
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0xb5, 0x68, 0x7c, 0xc6, 0x09, 0x53, 0xe2, 0x9f,
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},
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{ 0xda, 0x70, 0x09, 0x9e, 0x36, 0x43, 0x6f, 0xa5,
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0x21, 0x8d, 0x5c, 0xe7, 0xcb, 0xb4, 0xf2, 0x18,
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0x1d, 0xa6, 0xd4, 0x09, 0x68, 0x9f, 0x83, 0x70,
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0x4b, 0xf1, 0xe2, 0x3c, 0xb5, 0x5a, 0x2e, 0xc7,
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},
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{ 0xd7, 0x8d, 0xbe, 0x53, 0x60, 0xf6, 0x09, 0x3a,
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0x41, 0x72, 0x28, 0xc5, 0x1b, 0xac, 0xe4, 0x9f,
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0x3a, 0xf6, 0x09, 0x60, 0xac, 0x1b, 0xd7, 0x8d,
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0x9f, 0x41, 0x53, 0xbe, 0xc5, 0x72, 0x28, 0xe4,
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},
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{ 0xe2, 0xbc, 0x24, 0xc1, 0x47, 0x7a, 0xdb, 0x16,
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0x58, 0x05, 0xf3, 0xaf, 0x3d, 0x90, 0x8e, 0x69,
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0xb4, 0x82, 0xc1, 0x7b, 0x1a, 0xed, 0x27, 0xd8,
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0x6f, 0xf9, 0x0c, 0x95, 0xa6, 0x43, 0x50, 0x3e,
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},
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{ 0xac, 0xf1, 0x4a, 0x2f, 0x79, 0xc2, 0x96, 0x58,
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0x60, 0x1d, 0xd3, 0xe4, 0x0e, 0xb7, 0x35, 0x8b,
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0x49, 0x3e, 0x2f, 0xc5, 0x92, 0x58, 0xfc, 0xa3,
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0xb7, 0xe0, 0x14, 0x7a, 0x61, 0x0d, 0x8b, 0xd6,
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},
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{ 0xd4, 0x0b, 0xb2, 0x7e, 0x4f, 0x90, 0x18, 0xad,
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0xe3, 0x3c, 0x59, 0xc7, 0x25, 0xfa, 0x86, 0x61,
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0x61, 0xb4, 0xdb, 0x8d, 0x1c, 0x43, 0xa7, 0x7e,
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0x9a, 0x5f, 0x06, 0xf8, 0xe0, 0x25, 0x39, 0xc2,
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},
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{ 0x1d, 0xf2, 0xd8, 0x84, 0xa6, 0x3f, 0x7b, 0x41,
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0xca, 0x59, 0x63, 0xbe, 0x05, 0xe0, 0x9c, 0x27,
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0x27, 0x1b, 0xe4, 0x71, 0x49, 0xac, 0x8e, 0xd2,
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0xf0, 0xc6, 0x9a, 0x0d, 0x3f, 0x53, 0x65, 0xb8,
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},
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};
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#endif
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static const uint8_t pbox[32] = {
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16, 7, 20, 21, 29, 12, 28, 17, 1, 15, 23, 26, 5, 18, 31, 10,
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@ -180,7 +224,10 @@ ascii_to_bin(char ch)
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* being initialized, and therefore doesn't need to be made
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* reentrant. */
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struct const_des_ctx {
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uint8_t init_perm[64], final_perm[64]; /* referenced 2 times each */
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#if USE_ip_mask
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uint8_t init_perm[64]; /* referenced 2 times */
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#endif
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uint8_t final_perm[64]; /* 2 times */
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uint8_t m_sbox[4][4096]; /* 5 times */
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};
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#define C (*cctx)
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@ -191,22 +238,27 @@ struct const_des_ctx {
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static struct const_des_ctx*
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const_des_init(void)
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{
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int i, j, b;
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uint8_t u_sbox[8][64];
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unsigned i, j, b;
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struct const_des_ctx *cctx;
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#if !USE_PRECOMPUTED_u_sbox
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uint8_t u_sbox[8][64];
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cctx = xmalloc(sizeof(*cctx));
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/*
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* Invert the S-boxes, reordering the input bits.
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*/
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/* Invert the S-boxes, reordering the input bits. */
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for (i = 0; i < 8; i++) {
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for (j = 0; j < 64; j++) {
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b = (j & 0x20) | ((j & 1) << 4) | ((j >> 1) & 0xf);
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u_sbox[i][j] = sbox[i][b];
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}
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}
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for (i = 0; i < 8; i++) {
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fprintf(stderr, "\t{\t");
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for (j = 0; j < 64; j+=2)
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fprintf(stderr, " 0x%02x,", u_sbox[i][j] + u_sbox[i][j+1]*16);
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fprintf(stderr, "\n\t},\n");
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}
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/*
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* Convert the inverted S-boxes into 4 arrays of 8 bits.
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* Each will handle 12 bits of the S-box input.
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@ -217,24 +269,45 @@ const_des_init(void)
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m_sbox[b][(i << 6) | j] =
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(uint8_t)((u_sbox[(b << 1)][i] << 4) |
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u_sbox[(b << 1) + 1][j]);
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#else
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cctx = xmalloc(sizeof(*cctx));
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/*
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* Convert the inverted S-boxes into 4 arrays of 8 bits.
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* Each will handle 12 bits of the S-box input.
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*/
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for (b = 0; b < 4; b++)
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for (i = 0; i < 64; i++)
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for (j = 0; j < 64; j++) {
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uint8_t lo, hi;
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hi = u_sbox[(b << 1)][i / 2];
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if (!(i & 1))
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hi <<= 4;
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lo = u_sbox[(b << 1) + 1][j / 2];
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if (j & 1)
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lo >>= 4;
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m_sbox[b][(i << 6) | j] = (hi & 0xf0) | (lo & 0x0f);
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}
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#endif
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/*
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* Set up the initial & final permutations into a useful form.
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*/
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for (i = 0; i < 64; i++) {
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final_perm[i] = IP[i] - 1;
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#if USE_ip_mask
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init_perm[final_perm[i]] = (uint8_t)i;
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#endif
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}
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return cctx;
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}
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#define WANT_REPETITIVE_SPEEDUP 0
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struct des_ctx {
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const struct const_des_ctx *const_ctx;
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uint32_t saltbits; /* referenced 5 times */
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#if WANT_REPETITIVE_SPEEDUP
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#if USE_REPETITIVE_SPEEDUP
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uint32_t old_salt; /* 3 times */
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uint32_t old_rawkey0, old_rawkey1; /* 3 times each */
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#endif
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@ -242,8 +315,12 @@ struct des_ctx {
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uint8_t inv_comp_perm[56]; /* 3 times */
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uint8_t inv_key_perm[64]; /* 3 times */
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uint32_t en_keysl[16], en_keysr[16]; /* 2 times each */
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// uint32_t de_keysl[16], de_keysr[16]; /* 2 times each */
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#if USE_de_keys
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uint32_t de_keysl[16], de_keysr[16]; /* 2 times each */
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#endif
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#if USE_ip_mask
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uint32_t ip_maskl[8][256], ip_maskr[8][256]; /* 9 times each */
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#endif
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uint32_t fp_maskl[8][256], fp_maskr[8][256]; /* 9 times each */
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uint32_t key_perm_maskl[8][128], key_perm_maskr[8][128]; /* 9 times */
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uint32_t comp_maskl[8][128], comp_maskr[8][128]; /* 9 times each */
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@ -260,8 +337,8 @@ struct des_ctx {
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#define inv_key_perm (D.inv_key_perm )
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#define en_keysl (D.en_keysl )
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#define en_keysr (D.en_keysr )
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//#define de_keysl (D.de_keysl )
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//#define de_keysr (D.de_keysr )
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#define de_keysl (D.de_keysl )
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#define de_keysr (D.de_keysr )
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#define ip_maskl (D.ip_maskl )
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#define ip_maskr (D.ip_maskr )
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#define fp_maskl (D.fp_maskl )
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@ -277,14 +354,13 @@ des_init(struct des_ctx *ctx, const struct const_des_ctx *cctx)
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{
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int i, j, b, k, inbit, obit;
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uint32_t p;
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uint32_t il, ir, fl, fr;
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const uint32_t *bits28, *bits24;
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if (!ctx)
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ctx = xmalloc(sizeof(*ctx));
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const_ctx = cctx;
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#if WANT_REPETITIVE_SPEEDUP
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#if USE_REPETITIVE_SPEEDUP
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old_rawkey0 = old_rawkey1 = 0;
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old_salt = 0;
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#endif
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@ -292,9 +368,7 @@ des_init(struct des_ctx *ctx, const struct const_des_ctx *cctx)
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bits28 = bits32 + 4;
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bits24 = bits28 + 4;
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/*
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* Initialise the inverted key permutation.
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*/
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/* Initialise the inverted key permutation. */
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for (i = 0; i < 64; i++) {
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inv_key_perm[i] = 255;
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}
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@ -308,9 +382,7 @@ des_init(struct des_ctx *ctx, const struct const_des_ctx *cctx)
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inv_comp_perm[i] = 255;
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}
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/*
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* Invert the key compression permutation.
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*/
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/* Invert the key compression permutation. */
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for (i = 0; i < 48; i++) {
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inv_comp_perm[comp_perm[i] - 1] = (uint8_t)i;
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}
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@ -320,19 +392,25 @@ des_init(struct des_ctx *ctx, const struct const_des_ctx *cctx)
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* and for the key initial and compression permutations.
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*/
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for (k = 0; k < 8; k++) {
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uint32_t il, ir;
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uint32_t fl, fr;
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for (i = 0; i < 256; i++) {
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#if USE_ip_mask
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il = 0;
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ir = 0;
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#endif
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fl = 0;
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fr = 0;
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for (j = 0; j < 8; j++) {
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inbit = 8 * k + j;
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if (i & bits8[j]) {
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#if USE_ip_mask
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obit = init_perm[inbit];
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if (obit < 32)
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il |= bits32[obit];
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else
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ir |= bits32[obit - 32];
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#endif
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obit = final_perm[inbit];
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if (obit < 32)
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fl |= bits32[obit];
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@ -340,8 +418,10 @@ des_init(struct des_ctx *ctx, const struct const_des_ctx *cctx)
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fr |= bits32[obit - 32];
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}
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}
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#if USE_ip_mask
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ip_maskl[k][i] = il;
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ip_maskr[k][i] = ir;
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#endif
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fp_maskl[k][i] = fl;
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fp_maskr[k][i] = fr;
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}
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@ -409,7 +489,7 @@ setup_salt(struct des_ctx *ctx, uint32_t salt)
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uint32_t obit, saltbit;
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int i;
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#if WANT_REPETITIVE_SPEEDUP
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#if USE_REPETITIVE_SPEEDUP
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if (salt == old_salt)
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return;
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old_salt = salt;
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@ -435,7 +515,7 @@ des_setkey(struct des_ctx *ctx, const char *key)
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rawkey0 = ntohl(*(const uint32_t *) key);
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rawkey1 = ntohl(*(const uint32_t *) (key + 4));
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#if WANT_REPETITIVE_SPEEDUP
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#if USE_REPETITIVE_SPEEDUP
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if ((rawkey0 | rawkey1)
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&& rawkey0 == old_rawkey0
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&& rawkey1 == old_rawkey1
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@ -453,7 +533,7 @@ des_setkey(struct des_ctx *ctx, const char *key)
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#endif
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/*
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* Do key permutation and split into two 28-bit subkeys.
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* Do key permutation and split into two 28-bit subkeys.
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*/
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k0 = key_perm_maskl[0][rawkey0 >> 25]
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| key_perm_maskl[1][(rawkey0 >> 17) & 0x7f]
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@ -472,7 +552,7 @@ des_setkey(struct des_ctx *ctx, const char *key)
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| key_perm_maskr[6][(rawkey1 >> 9) & 0x7f]
|
||||
| key_perm_maskr[7][(rawkey1 >> 1) & 0x7f];
|
||||
/*
|
||||
* Rotate subkeys and do compression permutation.
|
||||
* Rotate subkeys and do compression permutation.
|
||||
*/
|
||||
shifts = 0;
|
||||
for (round = 0; round < 16; round++) {
|
||||
@ -483,7 +563,9 @@ des_setkey(struct des_ctx *ctx, const char *key)
|
||||
t0 = (k0 << shifts) | (k0 >> (28 - shifts));
|
||||
t1 = (k1 << shifts) | (k1 >> (28 - shifts));
|
||||
|
||||
// de_keysl[15 - round] =
|
||||
#if USE_de_keys
|
||||
de_keysl[15 - round] =
|
||||
#endif
|
||||
en_keysl[round] = comp_maskl[0][(t0 >> 21) & 0x7f]
|
||||
| comp_maskl[1][(t0 >> 14) & 0x7f]
|
||||
| comp_maskl[2][(t0 >> 7) & 0x7f]
|
||||
@ -493,7 +575,9 @@ des_setkey(struct des_ctx *ctx, const char *key)
|
||||
| comp_maskl[6][(t1 >> 7) & 0x7f]
|
||||
| comp_maskl[7][t1 & 0x7f];
|
||||
|
||||
// de_keysr[15 - round] =
|
||||
#if USE_de_keys
|
||||
de_keysr[15 - round] =
|
||||
#endif
|
||||
en_keysr[round] = comp_maskr[0][(t0 >> 21) & 0x7f]
|
||||
| comp_maskr[1][(t0 >> 14) & 0x7f]
|
||||
| comp_maskr[2][(t0 >> 7) & 0x7f]
|
||||
@ -519,7 +603,9 @@ do_des(struct des_ctx *ctx, /*uint32_t l_in, uint32_t r_in,*/ uint32_t *l_out, u
|
||||
int round;
|
||||
|
||||
/* Do initial permutation (IP). */
|
||||
#if 0
|
||||
#if USE_ip_mask
|
||||
uint32_t l_in = 0;
|
||||
uint32_t r_in = 0;
|
||||
l = ip_maskl[0][l_in >> 24]
|
||||
| ip_maskl[1][(l_in >> 16) & 0xff]
|
||||
| ip_maskl[2][(l_in >> 8) & 0xff]
|
||||
@ -588,9 +674,8 @@ do_des(struct des_ctx *ctx, /*uint32_t l_in, uint32_t r_in,*/ uint32_t *l_out, u
|
||||
r = l;
|
||||
l = f;
|
||||
} while (--count);
|
||||
/*
|
||||
* Do final permutation (inverse of IP).
|
||||
*/
|
||||
|
||||
/* Do final permutation (inverse of IP). */
|
||||
*l_out = fp_maskl[0][l >> 24]
|
||||
| fp_maskl[1][(l >> 16) & 0xff]
|
||||
| fp_maskl[2][(l >> 8) & 0xff]
|
||||
@ -613,7 +698,8 @@ do_des(struct des_ctx *ctx, /*uint32_t l_in, uint32_t r_in,*/ uint32_t *l_out, u
|
||||
|
||||
static char *
|
||||
NOINLINE
|
||||
des_crypt(struct des_ctx *ctx, char output[21], const unsigned char *key, const unsigned char *setting)
|
||||
des_crypt(struct des_ctx *ctx, char output[DES_OUT_BUFSIZE],
|
||||
const unsigned char *key, const unsigned char *setting)
|
||||
{
|
||||
uint32_t salt, l, r0, r1, keybuf[2];
|
||||
uint8_t *p, *q;
|
||||
@ -679,7 +765,11 @@ des_crypt(struct des_ctx *ctx, char output[21], const unsigned char *key, const
|
||||
return output;
|
||||
}
|
||||
|
||||
#undef WANT_REPETITIVE_SPEEDUP
|
||||
#undef USE_PRECOMPUTED_u_sbox
|
||||
#undef USE_REPETITIVE_SPEEDUP
|
||||
#undef USE_ip_mask
|
||||
#undef USE_de_keys
|
||||
|
||||
#undef C
|
||||
#undef init_perm
|
||||
#undef final_perm
|
||||
@ -695,8 +785,8 @@ des_crypt(struct des_ctx *ctx, char output[21], const unsigned char *key, const
|
||||
#undef inv_key_perm
|
||||
#undef en_keysl
|
||||
#undef en_keysr
|
||||
//#undef de_keysl
|
||||
//#undef de_keysr
|
||||
#undef de_keysl
|
||||
#undef de_keysr
|
||||
#undef ip_maskl
|
||||
#undef ip_maskr
|
||||
#undef fp_maskl
|
||||
|
||||
Loading…
Reference in New Issue
Block a user