summaryrefslogtreecommitdiff
path: root/src/common/des.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/common/des.c')
-rw-r--r--src/common/des.c316
1 files changed, 155 insertions, 161 deletions
diff --git a/src/common/des.c b/src/common/des.c
index 917fc33e0..f2347f3c4 100644
--- a/src/common/des.c
+++ b/src/common/des.c
@@ -12,207 +12,201 @@
/// Bitmask for accessing individual bits of a byte.
static const uint8_t mask[8] = {
- 0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01
+ 0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01
};
/// Initial permutation (IP).
-static void IP(BIT64* src)
+static void IP(BIT64 *src)
{
- BIT64 tmp = {{0}};
-
- static const uint8_t ip_table[64] = {
- 58, 50, 42, 34, 26, 18, 10, 2,
- 60, 52, 44, 36, 28, 20, 12, 4,
- 62, 54, 46, 38, 30, 22, 14, 6,
- 64, 56, 48, 40, 32, 24, 16, 8,
- 57, 49, 41, 33, 25, 17, 9, 1,
- 59, 51, 43, 35, 27, 19, 11, 3,
- 61, 53, 45, 37, 29, 21, 13, 5,
- 63, 55, 47, 39, 31, 23, 15, 7,
- };
-
- size_t i;
- for( i = 0; i < ARRAYLENGTH(ip_table); ++i )
- {
- uint8_t j = ip_table[i] - 1;
- if( src->b[(j >> 3) & 7] & mask[j & 7] )
- tmp .b[(i >> 3) & 7] |= mask[i & 7];
- }
-
- *src = tmp;
+ BIT64 tmp = {{0}};
+
+ static const uint8_t ip_table[64] = {
+ 58, 50, 42, 34, 26, 18, 10, 2,
+ 60, 52, 44, 36, 28, 20, 12, 4,
+ 62, 54, 46, 38, 30, 22, 14, 6,
+ 64, 56, 48, 40, 32, 24, 16, 8,
+ 57, 49, 41, 33, 25, 17, 9, 1,
+ 59, 51, 43, 35, 27, 19, 11, 3,
+ 61, 53, 45, 37, 29, 21, 13, 5,
+ 63, 55, 47, 39, 31, 23, 15, 7,
+ };
+
+ size_t i;
+ for (i = 0; i < ARRAYLENGTH(ip_table); ++i) {
+ uint8_t j = ip_table[i] - 1;
+ if (src->b[(j >> 3) & 7] & mask[j & 7])
+ tmp .b[(i >> 3) & 7] |= mask[i & 7];
+ }
+
+ *src = tmp;
}
/// Final permutation (IP^-1).
-static void FP(BIT64* src)
+static void FP(BIT64 *src)
{
- BIT64 tmp = {{0}};
-
- static const uint8_t fp_table[64] = {
- 40, 8, 48, 16, 56, 24, 64, 32,
- 39, 7, 47, 15, 55, 23, 63, 31,
- 38, 6, 46, 14, 54, 22, 62, 30,
- 37, 5, 45, 13, 53, 21, 61, 29,
- 36, 4, 44, 12, 52, 20, 60, 28,
- 35, 3, 43, 11, 51, 19, 59, 27,
- 34, 2, 42, 10, 50, 18, 58, 26,
- 33, 1, 41, 9, 49, 17, 57, 25,
- };
-
- size_t i;
- for( i = 0; i < ARRAYLENGTH(fp_table); ++i )
- {
- uint8_t j = fp_table[i] - 1;
- if( src->b[(j >> 3) & 7] & mask[j & 7] )
- tmp .b[(i >> 3) & 7] |= mask[i & 7];
- }
-
- *src = tmp;
+ BIT64 tmp = {{0}};
+
+ static const uint8_t fp_table[64] = {
+ 40, 8, 48, 16, 56, 24, 64, 32,
+ 39, 7, 47, 15, 55, 23, 63, 31,
+ 38, 6, 46, 14, 54, 22, 62, 30,
+ 37, 5, 45, 13, 53, 21, 61, 29,
+ 36, 4, 44, 12, 52, 20, 60, 28,
+ 35, 3, 43, 11, 51, 19, 59, 27,
+ 34, 2, 42, 10, 50, 18, 58, 26,
+ 33, 1, 41, 9, 49, 17, 57, 25,
+ };
+
+ size_t i;
+ for (i = 0; i < ARRAYLENGTH(fp_table); ++i) {
+ uint8_t j = fp_table[i] - 1;
+ if (src->b[(j >> 3) & 7] & mask[j & 7])
+ tmp .b[(i >> 3) & 7] |= mask[i & 7];
+ }
+
+ *src = tmp;
}
/// Expansion (E).
/// Expands upper four 8-bits (32b) into eight 6-bits (48b).
-static void E(BIT64* src)
+static void E(BIT64 *src)
{
- BIT64 tmp = {{0}};
-
-if( false )
-{// original
- static const uint8_t expand_table[48] = {
- 32, 1, 2, 3, 4, 5,
- 4, 5, 6, 7, 8, 9,
- 8, 9, 10, 11, 12, 13,
- 12, 13, 14, 15, 16, 17,
- 16, 17, 18, 19, 20, 21,
- 20, 21, 22, 23, 24, 25,
- 24, 25, 26, 27, 28, 29,
- 28, 29, 30, 31, 32, 1,
- };
-
- size_t i;
- for( i = 0; i < ARRAYLENGTH(expand_table); ++i )
- {
- uint8_t j = expand_table[i] - 1;
- if( src->b[j / 8 + 4] & mask[j % 8] )
- tmp .b[i / 6 + 0] |= mask[i % 6];
- }
-}
-else
-{// optimized
- tmp.b[0] = ((src->b[7]<<5) | (src->b[4]>>3)) & 0x3f; // ..0 vutsr
- tmp.b[1] = ((src->b[4]<<1) | (src->b[5]>>7)) & 0x3f; // ..srqpo n
- tmp.b[2] = ((src->b[4]<<5) | (src->b[5]>>3)) & 0x3f; // ..o nmlkj
- tmp.b[3] = ((src->b[5]<<1) | (src->b[6]>>7)) & 0x3f; // ..kjihg f
- tmp.b[4] = ((src->b[5]<<5) | (src->b[6]>>3)) & 0x3f; // ..g fedcb
- tmp.b[5] = ((src->b[6]<<1) | (src->b[7]>>7)) & 0x3f; // ..cba98 7
- tmp.b[6] = ((src->b[6]<<5) | (src->b[7]>>3)) & 0x3f; // ..8 76543
- tmp.b[7] = ((src->b[7]<<1) | (src->b[4]>>7)) & 0x3f; // ..43210 v
-}
-
- *src = tmp;
+ BIT64 tmp = {{0}};
+
+ if (false) {
+ // original
+ static const uint8_t expand_table[48] = {
+ 32, 1, 2, 3, 4, 5,
+ 4, 5, 6, 7, 8, 9,
+ 8, 9, 10, 11, 12, 13,
+ 12, 13, 14, 15, 16, 17,
+ 16, 17, 18, 19, 20, 21,
+ 20, 21, 22, 23, 24, 25,
+ 24, 25, 26, 27, 28, 29,
+ 28, 29, 30, 31, 32, 1,
+ };
+
+ size_t i;
+ for (i = 0; i < ARRAYLENGTH(expand_table); ++i) {
+ uint8_t j = expand_table[i] - 1;
+ if (src->b[j / 8 + 4] & mask[j % 8])
+ tmp .b[i / 6 + 0] |= mask[i % 6];
+ }
+ } else {
+ // optimized
+ tmp.b[0] = ((src->b[7]<<5) | (src->b[4]>>3)) & 0x3f; // ..0 vutsr
+ tmp.b[1] = ((src->b[4]<<1) | (src->b[5]>>7)) & 0x3f; // ..srqpo n
+ tmp.b[2] = ((src->b[4]<<5) | (src->b[5]>>3)) & 0x3f; // ..o nmlkj
+ tmp.b[3] = ((src->b[5]<<1) | (src->b[6]>>7)) & 0x3f; // ..kjihg f
+ tmp.b[4] = ((src->b[5]<<5) | (src->b[6]>>3)) & 0x3f; // ..g fedcb
+ tmp.b[5] = ((src->b[6]<<1) | (src->b[7]>>7)) & 0x3f; // ..cba98 7
+ tmp.b[6] = ((src->b[6]<<5) | (src->b[7]>>3)) & 0x3f; // ..8 76543
+ tmp.b[7] = ((src->b[7]<<1) | (src->b[4]>>7)) & 0x3f; // ..43210 v
+ }
+
+ *src = tmp;
}
/// Transposition (P-BOX).
-static void TP(BIT64* src)
+static void TP(BIT64 *src)
{
- BIT64 tmp = {{0}};
-
- static const uint8_t tp_table[32] = {
- 16, 7, 20, 21,
- 29, 12, 28, 17,
- 1, 15, 23, 26,
- 5, 18, 31, 10,
- 2, 8, 24, 14,
- 32, 27, 3, 9,
- 19, 13, 30, 6,
- 22, 11, 4, 25,
- };
-
- size_t i;
- for( i = 0; i < ARRAYLENGTH(tp_table); ++i )
- {
- uint8_t j = tp_table[i] - 1;
- if( src->b[(j >> 3) + 0] & mask[j & 7] )
- tmp .b[(i >> 3) + 4] |= mask[i & 7];
- }
-
- *src = tmp;
+ BIT64 tmp = {{0}};
+
+ static const uint8_t tp_table[32] = {
+ 16, 7, 20, 21,
+ 29, 12, 28, 17,
+ 1, 15, 23, 26,
+ 5, 18, 31, 10,
+ 2, 8, 24, 14,
+ 32, 27, 3, 9,
+ 19, 13, 30, 6,
+ 22, 11, 4, 25,
+ };
+
+ size_t i;
+ for (i = 0; i < ARRAYLENGTH(tp_table); ++i) {
+ uint8_t j = tp_table[i] - 1;
+ if (src->b[(j >> 3) + 0] & mask[j & 7])
+ tmp .b[(i >> 3) + 4] |= mask[i & 7];
+ }
+
+ *src = tmp;
}
/// Substitution boxes (S-boxes).
/// NOTE: This implementation was optimized to process two nibbles in one step (twice as fast).
-static void SBOX(BIT64* src)
+static void SBOX(BIT64 *src)
{
- BIT64 tmp = {{0}};
-
- static const uint8_t s_table[4][64] = {
- {
- 0xef, 0x03, 0x41, 0xfd, 0xd8, 0x74, 0x1e, 0x47, 0x26, 0xef, 0xfb, 0x22, 0xb3, 0xd8, 0x84, 0x1e,
- 0x39, 0xac, 0xa7, 0x60, 0x62, 0xc1, 0xcd, 0xba, 0x5c, 0x96, 0x90, 0x59, 0x05, 0x3b, 0x7a, 0x85,
- 0x40, 0xfd, 0x1e, 0xc8, 0xe7, 0x8a, 0x8b, 0x21, 0xda, 0x43, 0x64, 0x9f, 0x2d, 0x14, 0xb1, 0x72,
- 0xf5, 0x5b, 0xc8, 0xb6, 0x9c, 0x37, 0x76, 0xec, 0x39, 0xa0, 0xa3, 0x05, 0x52, 0x6e, 0x0f, 0xd9,
- },{
- 0xa7, 0xdd, 0x0d, 0x78, 0x9e, 0x0b, 0xe3, 0x95, 0x60, 0x36, 0x36, 0x4f, 0xf9, 0x60, 0x5a, 0xa3,
- 0x11, 0x24, 0xd2, 0x87, 0xc8, 0x52, 0x75, 0xec, 0xbb, 0xc1, 0x4c, 0xba, 0x24, 0xfe, 0x8f, 0x19,
- 0xda, 0x13, 0x66, 0xaf, 0x49, 0xd0, 0x90, 0x06, 0x8c, 0x6a, 0xfb, 0x91, 0x37, 0x8d, 0x0d, 0x78,
- 0xbf, 0x49, 0x11, 0xf4, 0x23, 0xe5, 0xce, 0x3b, 0x55, 0xbc, 0xa2, 0x57, 0xe8, 0x22, 0x74, 0xce,
- },{
- 0x2c, 0xea, 0xc1, 0xbf, 0x4a, 0x24, 0x1f, 0xc2, 0x79, 0x47, 0xa2, 0x7c, 0xb6, 0xd9, 0x68, 0x15,
- 0x80, 0x56, 0x5d, 0x01, 0x33, 0xfd, 0xf4, 0xae, 0xde, 0x30, 0x07, 0x9b, 0xe5, 0x83, 0x9b, 0x68,
- 0x49, 0xb4, 0x2e, 0x83, 0x1f, 0xc2, 0xb5, 0x7c, 0xa2, 0x19, 0xd8, 0xe5, 0x7c, 0x2f, 0x83, 0xda,
- 0xf7, 0x6b, 0x90, 0xfe, 0xc4, 0x01, 0x5a, 0x97, 0x61, 0xa6, 0x3d, 0x40, 0x0b, 0x58, 0xe6, 0x3d,
- },{
- 0x4d, 0xd1, 0xb2, 0x0f, 0x28, 0xbd, 0xe4, 0x78, 0xf6, 0x4a, 0x0f, 0x93, 0x8b, 0x17, 0xd1, 0xa4,
- 0x3a, 0xec, 0xc9, 0x35, 0x93, 0x56, 0x7e, 0xcb, 0x55, 0x20, 0xa0, 0xfe, 0x6c, 0x89, 0x17, 0x62,
- 0x17, 0x62, 0x4b, 0xb1, 0xb4, 0xde, 0xd1, 0x87, 0xc9, 0x14, 0x3c, 0x4a, 0x7e, 0xa8, 0xe2, 0x7d,
- 0xa0, 0x9f, 0xf6, 0x5c, 0x6a, 0x09, 0x8d, 0xf0, 0x0f, 0xe3, 0x53, 0x25, 0x95, 0x36, 0x28, 0xcb,
- }
- };
-
- size_t i;
- for( i = 0; i < ARRAYLENGTH(s_table); ++i )
- {
- tmp.b[i] = (s_table[i][src->b[i*2+0]] & 0xf0)
- | (s_table[i][src->b[i*2+1]] & 0x0f);
- }
-
- *src = tmp;
+ BIT64 tmp = {{0}};
+
+ static const uint8_t s_table[4][64] = {
+ {
+ 0xef, 0x03, 0x41, 0xfd, 0xd8, 0x74, 0x1e, 0x47, 0x26, 0xef, 0xfb, 0x22, 0xb3, 0xd8, 0x84, 0x1e,
+ 0x39, 0xac, 0xa7, 0x60, 0x62, 0xc1, 0xcd, 0xba, 0x5c, 0x96, 0x90, 0x59, 0x05, 0x3b, 0x7a, 0x85,
+ 0x40, 0xfd, 0x1e, 0xc8, 0xe7, 0x8a, 0x8b, 0x21, 0xda, 0x43, 0x64, 0x9f, 0x2d, 0x14, 0xb1, 0x72,
+ 0xf5, 0x5b, 0xc8, 0xb6, 0x9c, 0x37, 0x76, 0xec, 0x39, 0xa0, 0xa3, 0x05, 0x52, 0x6e, 0x0f, 0xd9,
+ },{
+ 0xa7, 0xdd, 0x0d, 0x78, 0x9e, 0x0b, 0xe3, 0x95, 0x60, 0x36, 0x36, 0x4f, 0xf9, 0x60, 0x5a, 0xa3,
+ 0x11, 0x24, 0xd2, 0x87, 0xc8, 0x52, 0x75, 0xec, 0xbb, 0xc1, 0x4c, 0xba, 0x24, 0xfe, 0x8f, 0x19,
+ 0xda, 0x13, 0x66, 0xaf, 0x49, 0xd0, 0x90, 0x06, 0x8c, 0x6a, 0xfb, 0x91, 0x37, 0x8d, 0x0d, 0x78,
+ 0xbf, 0x49, 0x11, 0xf4, 0x23, 0xe5, 0xce, 0x3b, 0x55, 0xbc, 0xa2, 0x57, 0xe8, 0x22, 0x74, 0xce,
+ },{
+ 0x2c, 0xea, 0xc1, 0xbf, 0x4a, 0x24, 0x1f, 0xc2, 0x79, 0x47, 0xa2, 0x7c, 0xb6, 0xd9, 0x68, 0x15,
+ 0x80, 0x56, 0x5d, 0x01, 0x33, 0xfd, 0xf4, 0xae, 0xde, 0x30, 0x07, 0x9b, 0xe5, 0x83, 0x9b, 0x68,
+ 0x49, 0xb4, 0x2e, 0x83, 0x1f, 0xc2, 0xb5, 0x7c, 0xa2, 0x19, 0xd8, 0xe5, 0x7c, 0x2f, 0x83, 0xda,
+ 0xf7, 0x6b, 0x90, 0xfe, 0xc4, 0x01, 0x5a, 0x97, 0x61, 0xa6, 0x3d, 0x40, 0x0b, 0x58, 0xe6, 0x3d,
+ },{
+ 0x4d, 0xd1, 0xb2, 0x0f, 0x28, 0xbd, 0xe4, 0x78, 0xf6, 0x4a, 0x0f, 0x93, 0x8b, 0x17, 0xd1, 0xa4,
+ 0x3a, 0xec, 0xc9, 0x35, 0x93, 0x56, 0x7e, 0xcb, 0x55, 0x20, 0xa0, 0xfe, 0x6c, 0x89, 0x17, 0x62,
+ 0x17, 0x62, 0x4b, 0xb1, 0xb4, 0xde, 0xd1, 0x87, 0xc9, 0x14, 0x3c, 0x4a, 0x7e, 0xa8, 0xe2, 0x7d,
+ 0xa0, 0x9f, 0xf6, 0x5c, 0x6a, 0x09, 0x8d, 0xf0, 0x0f, 0xe3, 0x53, 0x25, 0x95, 0x36, 0x28, 0xcb,
+ }
+ };
+
+ size_t i;
+ for (i = 0; i < ARRAYLENGTH(s_table); ++i) {
+ tmp.b[i] = (s_table[i][src->b[i*2+0]] & 0xf0)
+ | (s_table[i][src->b[i*2+1]] & 0x0f);
+ }
+
+ *src = tmp;
}
/// DES round function.
/// XORs src[0..3] with TP(SBOX(E(src[4..7]))).
-static void RoundFunction(BIT64* src)
+static void RoundFunction(BIT64 *src)
{
- BIT64 tmp = *src;
- E(&tmp);
- SBOX(&tmp);
- TP(&tmp);
-
- src->b[0] ^= tmp.b[4];
- src->b[1] ^= tmp.b[5];
- src->b[2] ^= tmp.b[6];
- src->b[3] ^= tmp.b[7];
+ BIT64 tmp = *src;
+ E(&tmp);
+ SBOX(&tmp);
+ TP(&tmp);
+
+ src->b[0] ^= tmp.b[4];
+ src->b[1] ^= tmp.b[5];
+ src->b[2] ^= tmp.b[6];
+ src->b[3] ^= tmp.b[7];
}
-void des_decrypt_block(BIT64* block)
+void des_decrypt_block(BIT64 *block)
{
- IP(block);
- RoundFunction(block);
- FP(block);
+ IP(block);
+ RoundFunction(block);
+ FP(block);
}
-void des_decrypt(unsigned char* data, size_t size)
+void des_decrypt(unsigned char *data, size_t size)
{
- BIT64* p = (BIT64*)data;
- size_t i;
+ BIT64 *p = (BIT64 *)data;
+ size_t i;
- for( i = 0; i*8 < size; i += 8 )
- des_decrypt_block(p);
+ for (i = 0; i*8 < size; i += 8)
+ des_decrypt_block(p);
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-04 04:29:56 +0000