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+/*
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+ * SM4 Encryption alogrithm (SMS4 algorithm)
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+ * GM/T 0002-2012 Chinese National Standard ref:http://www.oscca.gov.cn/
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+ * thanks to Xyssl
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+ * thnaks and refers to http://hi.baidu.com/numax/blog/item/80addfefddfb93e4cf1b3e61.html
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+ * author:goldboar
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+ * email:goldboar@163.com
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+ * 2012-4-20
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+ */
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+
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+// Test vector 1
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+// plain: 01 23 45 67 89 ab cd ef fe dc ba 98 76 54 32 10
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+// key: 01 23 45 67 89 ab cd ef fe dc ba 98 76 54 32 10
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+// round key and temp computing result:
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+// rk[ 0] = f12186f9 X[ 0] = 27fad345
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+// rk[ 1] = 41662b61 X[ 1] = a18b4cb2
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+// rk[ 2] = 5a6ab19a X[ 2] = 11c1e22a
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+// rk[ 3] = 7ba92077 X[ 3] = cc13e2ee
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+// rk[ 4] = 367360f4 X[ 4] = f87c5bd5
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+// rk[ 5] = 776a0c61 X[ 5] = 33220757
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+// rk[ 6] = b6bb89b3 X[ 6] = 77f4c297
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+// rk[ 7] = 24763151 X[ 7] = 7a96f2eb
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+// rk[ 8] = a520307c X[ 8] = 27dac07f
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+// rk[ 9] = b7584dbd X[ 9] = 42dd0f19
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+// rk[10] = c30753ed X[10] = b8a5da02
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+// rk[11] = 7ee55b57 X[11] = 907127fa
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+// rk[12] = 6988608c X[12] = 8b952b83
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+// rk[13] = 30d895b7 X[13] = d42b7c59
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+// rk[14] = 44ba14af X[14] = 2ffc5831
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+// rk[15] = 104495a1 X[15] = f69e6888
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+// rk[16] = d120b428 X[16] = af2432c4
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+// rk[17] = 73b55fa3 X[17] = ed1ec85e
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+// rk[18] = cc874966 X[18] = 55a3ba22
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+// rk[19] = 92244439 X[19] = 124b18aa
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+// rk[20] = e89e641f X[20] = 6ae7725f
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+// rk[21] = 98ca015a X[21] = f4cba1f9
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+// rk[22] = c7159060 X[22] = 1dcdfa10
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+// rk[23] = 99e1fd2e X[23] = 2ff60603
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+// rk[24] = b79bd80c X[24] = eff24fdc
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+// rk[25] = 1d2115b0 X[25] = 6fe46b75
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+// rk[26] = 0e228aeb X[26] = 893450ad
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+// rk[27] = f1780c81 X[27] = 7b938f4c
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+// rk[28] = 428d3654 X[28] = 536e4246
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+// rk[29] = 62293496 X[29] = 86b3e94f
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+// rk[30] = 01cf72e5 X[30] = d206965e
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+// rk[31] = 9124a012 X[31] = 681edf34
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+// cypher: 68 1e df 34 d2 06 96 5e 86 b3 e9 4f 53 6e 42 46
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+//
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+// test vector 2
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+// the same key and plain 1000000 times coumpting
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+// plain: 01 23 45 67 89 ab cd ef fe dc ba 98 76 54 32 10
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+// key: 01 23 45 67 89 ab cd ef fe dc ba 98 76 54 32 10
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+// cypher: 59 52 98 c7 c6 fd 27 1f 04 02 f8 04 c3 3d 3f 66
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+#include "stdafx.h"
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+#include "sm4.h"
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+#include <string.h>
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+#include <stdio.h>
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+
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+/*
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+ * 32-bit integer manipulation macros (big endian)
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+ */
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+#ifndef GET_ULONG_BE
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+#define GET_ULONG_BE(n,b,i) \
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+{ \
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+ (n) = ( (unsigned long) (b)[(i) ] << 24 ) \
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+ | ( (unsigned long) (b)[(i) + 1] << 16 ) \
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+ | ( (unsigned long) (b)[(i) + 2] << 8 ) \
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+ | ( (unsigned long) (b)[(i) + 3] ); \
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+}
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+#endif
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+
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+#ifndef PUT_ULONG_BE
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+#define PUT_ULONG_BE(n,b,i) \
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+{ \
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+ (b)[(i) ] = (unsigned char) ( (n) >> 24 ); \
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+ (b)[(i) + 1] = (unsigned char) ( (n) >> 16 ); \
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+ (b)[(i) + 2] = (unsigned char) ( (n) >> 8 ); \
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+ (b)[(i) + 3] = (unsigned char) ( (n) ); \
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+}
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+#endif
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+
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+/*
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+ *rotate shift left marco definition
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+ *
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+ */
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+#define SHL(x,n) (((x) & 0xFFFFFFFF) << n)
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+#define ROTL(x,n) (SHL((x),n) | ((x) >> (32 - n)))
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+
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+#define SWAP(a,b) { unsigned long t = a; a = b; b = t; t = 0; }
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+
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+/*
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+ * Expanded SM4 S-boxes
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+ /* Sbox table: 8bits input convert to 8 bits output*/
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+
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+static const unsigned char SboxTable[16][16] =
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+{
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+{0xd6,0x90,0xe9,0xfe,0xcc,0xe1,0x3d,0xb7,0x16,0xb6,0x14,0xc2,0x28,0xfb,0x2c,0x05},
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+{0x2b,0x67,0x9a,0x76,0x2a,0xbe,0x04,0xc3,0xaa,0x44,0x13,0x26,0x49,0x86,0x06,0x99},
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+{0x9c,0x42,0x50,0xf4,0x91,0xef,0x98,0x7a,0x33,0x54,0x0b,0x43,0xed,0xcf,0xac,0x62},
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+{0xe4,0xb3,0x1c,0xa9,0xc9,0x08,0xe8,0x95,0x80,0xdf,0x94,0xfa,0x75,0x8f,0x3f,0xa6},
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+{0x47,0x07,0xa7,0xfc,0xf3,0x73,0x17,0xba,0x83,0x59,0x3c,0x19,0xe6,0x85,0x4f,0xa8},
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+{0x68,0x6b,0x81,0xb2,0x71,0x64,0xda,0x8b,0xf8,0xeb,0x0f,0x4b,0x70,0x56,0x9d,0x35},
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+{0x1e,0x24,0x0e,0x5e,0x63,0x58,0xd1,0xa2,0x25,0x22,0x7c,0x3b,0x01,0x21,0x78,0x87},
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+{0xd4,0x00,0x46,0x57,0x9f,0xd3,0x27,0x52,0x4c,0x36,0x02,0xe7,0xa0,0xc4,0xc8,0x9e},
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+{0xea,0xbf,0x8a,0xd2,0x40,0xc7,0x38,0xb5,0xa3,0xf7,0xf2,0xce,0xf9,0x61,0x15,0xa1},
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+{0xe0,0xae,0x5d,0xa4,0x9b,0x34,0x1a,0x55,0xad,0x93,0x32,0x30,0xf5,0x8c,0xb1,0xe3},
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+{0x1d,0xf6,0xe2,0x2e,0x82,0x66,0xca,0x60,0xc0,0x29,0x23,0xab,0x0d,0x53,0x4e,0x6f},
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+{0xd5,0xdb,0x37,0x45,0xde,0xfd,0x8e,0x2f,0x03,0xff,0x6a,0x72,0x6d,0x6c,0x5b,0x51},
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+{0x8d,0x1b,0xaf,0x92,0xbb,0xdd,0xbc,0x7f,0x11,0xd9,0x5c,0x41,0x1f,0x10,0x5a,0xd8},
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+{0x0a,0xc1,0x31,0x88,0xa5,0xcd,0x7b,0xbd,0x2d,0x74,0xd0,0x12,0xb8,0xe5,0xb4,0xb0},
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+{0x89,0x69,0x97,0x4a,0x0c,0x96,0x77,0x7e,0x65,0xb9,0xf1,0x09,0xc5,0x6e,0xc6,0x84},
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+{0x18,0xf0,0x7d,0xec,0x3a,0xdc,0x4d,0x20,0x79,0xee,0x5f,0x3e,0xd7,0xcb,0x39,0x48}
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+};
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+
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+/* System parameter */
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+static const unsigned long FK[4] = {0xa3b1bac6,0x56aa3350,0x677d9197,0xb27022dc};
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+
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+/* fixed parameter */
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+static const unsigned long CK[32] =
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+{
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+0x00070e15,0x1c232a31,0x383f464d,0x545b6269,
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+0x70777e85,0x8c939aa1,0xa8afb6bd,0xc4cbd2d9,
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+0xe0e7eef5,0xfc030a11,0x181f262d,0x343b4249,
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+0x50575e65,0x6c737a81,0x888f969d,0xa4abb2b9,
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+0xc0c7ced5,0xdce3eaf1,0xf8ff060d,0x141b2229,
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+0x30373e45,0x4c535a61,0x686f767d,0x848b9299,
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+0xa0a7aeb5,0xbcc3cad1,0xd8dfe6ed,0xf4fb0209,
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+0x10171e25,0x2c333a41,0x484f565d,0x646b7279
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+};
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+
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+
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+/*
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+ * private function:
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+ * look up in SboxTable and get the related value.
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+ * args: [in] inch: 0x00~0xFF (8 bits unsigned value).
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+ */
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+static unsigned char sm4Sbox(unsigned char inch)
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+{
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+ unsigned char *pTable = (unsigned char *)SboxTable;
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+ unsigned char retVal = (unsigned char)(pTable[inch]);
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+ return retVal;
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+}
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+
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+/*
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+ * private F(Lt) function:
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+ * "T algorithm" == "L algorithm" + "t algorithm".
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+ * args: [in] a: a is a 32 bits unsigned value;
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+ * return: c: c is calculated with line algorithm "L" and nonline algorithm "t"
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+ */
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+static unsigned long sm4Lt(unsigned long ka)
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+{
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+ unsigned long bb = 0;
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+ unsigned long c = 0;
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+ unsigned char a[4];
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+ unsigned char b[4];
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+ PUT_ULONG_BE(ka,a,0)
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+ b[0] = sm4Sbox(a[0]);
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+ b[1] = sm4Sbox(a[1]);
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+ b[2] = sm4Sbox(a[2]);
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+ b[3] = sm4Sbox(a[3]);
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+ GET_ULONG_BE(bb,b,0)
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+ c =bb^(ROTL(bb, 2))^(ROTL(bb, 10))^(ROTL(bb, 18))^(ROTL(bb, 24));
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+ return c;
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+}
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+
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+/*
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+ * private F function:
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+ * Calculating and getting encryption/decryption contents.
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+ * args: [in] x0: original contents;
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+ * args: [in] x1: original contents;
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+ * args: [in] x2: original contents;
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+ * args: [in] x3: original contents;
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+ * args: [in] rk: encryption/decryption key;
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+ * return the contents of encryption/decryption contents.
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+ */
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+static unsigned long sm4F(unsigned long x0, unsigned long x1, unsigned long x2, unsigned long x3, unsigned long rk)
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+{
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+ return (x0^sm4Lt(x1^x2^x3^rk));
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+}
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+
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+
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+/* private function:
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+ * Calculating round encryption key.
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+ * args: [in] a: a is a 32 bits unsigned value;
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+ * return: sk[i]: i{0,1,2,3,...31}.
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+ */
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+static unsigned long sm4CalciRK(unsigned long ka)
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+{
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+ unsigned long bb = 0;
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+ unsigned long rk = 0;
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+ unsigned char a[4];
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+ unsigned char b[4];
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+ PUT_ULONG_BE(ka,a,0)
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+ b[0] = sm4Sbox(a[0]);
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+ b[1] = sm4Sbox(a[1]);
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+ b[2] = sm4Sbox(a[2]);
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+ b[3] = sm4Sbox(a[3]);
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+ GET_ULONG_BE(bb,b,0)
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+ rk = bb^(ROTL(bb, 13))^(ROTL(bb, 23));
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+ return rk;
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+}
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+
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+static void sm4_setkey( unsigned long SK[32], unsigned char key[16] )
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+{
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+ unsigned long MK[4];
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+ unsigned long k[36];
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+ unsigned long i = 0;
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+
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+ GET_ULONG_BE( MK[0], key, 0 );
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+ GET_ULONG_BE( MK[1], key, 4 );
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+ GET_ULONG_BE( MK[2], key, 8 );
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+ GET_ULONG_BE( MK[3], key, 12 );
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+ k[0] = MK[0]^FK[0];
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+ k[1] = MK[1]^FK[1];
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+ k[2] = MK[2]^FK[2];
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+ k[3] = MK[3]^FK[3];
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+ for(; i<32; i++)
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+ {
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+ k[i+4] = k[i] ^ (sm4CalciRK(k[i+1]^k[i+2]^k[i+3]^CK[i]));
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+ SK[i] = k[i+4];
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+ }
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+
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+}
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+
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+/*
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+ * SM4 standard one round processing
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+ *
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+ */
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+static void sm4_one_round( unsigned long sk[32],
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+ unsigned char input[16],
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+ unsigned char output[16] )
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+{
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+ unsigned long i = 0;
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+ unsigned long ulbuf[36];
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+
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+ memset(ulbuf, 0, sizeof(ulbuf));
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+ GET_ULONG_BE( ulbuf[0], input, 0 )
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+ GET_ULONG_BE( ulbuf[1], input, 4 )
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+ GET_ULONG_BE( ulbuf[2], input, 8 )
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+ GET_ULONG_BE( ulbuf[3], input, 12 )
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+ while(i<32)
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+ {
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+ ulbuf[i+4] = sm4F(ulbuf[i], ulbuf[i+1], ulbuf[i+2], ulbuf[i+3], sk[i]);
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+// #ifdef _DEBUG
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+// printf("rk(%02d) = 0x%08x, X(%02d) = 0x%08x \n",i,sk[i], i, ulbuf[i+4] );
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+// #endif
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+ i++;
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+ }
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+ PUT_ULONG_BE(ulbuf[35],output,0);
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+ PUT_ULONG_BE(ulbuf[34],output,4);
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+ PUT_ULONG_BE(ulbuf[33],output,8);
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+ PUT_ULONG_BE(ulbuf[32],output,12);
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+}
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+
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+/*
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+ * SM4 key schedule (128-bit, encryption)
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+ */
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+void sm4_setkey_enc( sm4_context *ctx, unsigned char key[16] )
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+{
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+ ctx->mode = SM4_ENCRYPT;
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+ sm4_setkey( ctx->sk, key );
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+}
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+
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+/*
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+ * SM4 key schedule (128-bit, decryption)
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+ */
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+void sm4_setkey_dec( sm4_context *ctx, unsigned char key[16] )
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+{
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+ int i;
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+ ctx->mode = SM4_ENCRYPT;
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+ sm4_setkey( ctx->sk, key );
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+ for( i = 0; i < 16; i ++ )
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+ {
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+ SWAP( ctx->sk[ i ], ctx->sk[ 31-i] );
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+ }
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+}
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+
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+
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+/*
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+ * SM4-ECB block encryption/decryption
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+ */
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+
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+void sm4_crypt_ecb( sm4_context *ctx,
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+ int mode,
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+ int length,
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+ unsigned char *input,
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+ unsigned char *output)
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+{
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+ while( length > 0 )
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+ {
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+ sm4_one_round( ctx->sk, input, output );
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+ input += 16;
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+ output += 16;
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+ length -= 16;
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+ }
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+
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+}
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+
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+/*
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+ * SM4-CBC buffer encryption/decryption
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+ */
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+void sm4_crypt_cbc( sm4_context *ctx,
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+ int mode,
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+ int length,
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+ unsigned char iv[16],
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+ unsigned char *input,
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+ unsigned char *output )
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+{
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+ int i;
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+ unsigned char temp[16];
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+
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+ if( mode == SM4_ENCRYPT )
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+ {
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+ while( length > 0 )
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+ {
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+ for( i = 0; i < 16; i++ )
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+ output[i] = (unsigned char)( input[i] ^ iv[i] );
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+
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+ sm4_one_round( ctx->sk, output, output );
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+ memcpy( iv, output, 16 );
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+
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+ input += 16;
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+ output += 16;
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+ length -= 16;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ else /* SM4_DECRYPT */
|
|
|
+ {
|
|
|
+ while( length > 0 )
|
|
|
+ {
|
|
|
+ memcpy( temp, input, 16 );
|
|
|
+ sm4_one_round( ctx->sk, input, output );
|
|
|
+
|
|
|
+ for( i = 0; i < 16; i++ )
|
|
|
+ output[i] = (unsigned char)( output[i] ^ iv[i] );
|
|
|
+
|
|
|
+ memcpy( iv, temp, 16 );
|
|
|
+
|
|
|
+ input += 16;
|
|
|
+ output += 16;
|
|
|
+ length -= 16;
|
|
|
+ }
|
|
|
+ }
|
|
|
+}
|