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rahash2: Add RC2
This commit is contained in:
Aneesh Dogra
pancake
parent
8fa47870b2
commit
571e2a80c8
@ -1,4 +1,4 @@
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OBJS = crypto.c ;
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OBJS += p/crypto_aes.c p/crypto_aes_algo.c p/crypto_xor.c p/crypto_blowfish.c;
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OBJS += p/crypto_aes.c p/crypto_aes_algo.c p/crypto_xor.c p/crypto_blowfish.c p/crypto_rc2.c;
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lib r_crypto : $(OBJS) : <include>../include <library>../util ;
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254
libr/crypto/p/crypto_rc2.c
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254
libr/crypto/p/crypto_rc2.c
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@ -0,0 +1,254 @@
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#include <r_lib.h>
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#include <r_crypto.h>
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#define BITS 1024
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#define RC2_KEY_SIZE 64 // bytes
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#define BLOCK_SIZE 8 // bytes
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static const ut8 PITABLE[256] = {
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0xD9, 0x78, 0xF9, 0xC4, 0x19, 0xDD, 0xB5, 0xED, 0x28, 0xE9, 0xFD, 0x79, 0x4A, 0xA0, 0xD8, 0x9D,
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0xC6, 0x7E, 0x37, 0x83, 0x2B, 0x76, 0x53, 0x8E, 0x62, 0x4C, 0x64, 0x88, 0x44, 0x8B, 0xFB, 0xA2,
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0x17, 0x9A, 0x59, 0xF5, 0x87, 0xB3, 0x4F, 0x13, 0x61, 0x45, 0x6D, 0x8D, 0x09, 0x81, 0x7D, 0x32,
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0xBD, 0x8F, 0x40, 0xEB, 0x86, 0xB7, 0x7B, 0x0B, 0xF0, 0x95, 0x21, 0x22, 0x5C, 0x6B, 0x4E, 0x82,
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0x54, 0xD6, 0x65, 0x93, 0xCE, 0x60, 0xB2, 0x1C, 0x73, 0x56, 0xC0, 0x14, 0xA7, 0x8C, 0xF1, 0xDC,
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0x12, 0x75, 0xCA, 0x1F, 0x3B, 0xBE, 0xE4, 0xD1, 0x42, 0x3D, 0xD4, 0x30, 0xA3, 0x3C, 0xB6, 0x26,
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0x6F, 0xBF, 0x0E, 0xDA, 0x46, 0x69, 0x07, 0x57, 0x27, 0xF2, 0x1D, 0x9B, 0xBC, 0x94, 0x43, 0x03,
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0xF8, 0x11, 0xC7, 0xF6, 0x90, 0xEF, 0x3E, 0xE7, 0x06, 0xC3, 0xD5, 0x2F, 0xC8, 0x66, 0x1E, 0xD7,
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0x08, 0xE8, 0xEA, 0xDE, 0x80, 0x52, 0xEE, 0xF7, 0x84, 0xAA, 0x72, 0xAC, 0x35, 0x4D, 0x6A, 0x2A,
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0x96, 0x1A, 0xD2, 0x71, 0x5A, 0x15, 0x49, 0x74, 0x4B, 0x9F, 0xD0, 0x5E, 0x04, 0x18, 0xA4, 0xEC,
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0xC2, 0xE0, 0x41, 0x6E, 0x0F, 0x51, 0xCB, 0xCC, 0x24, 0x91, 0xAF, 0x50, 0xA1, 0xF4, 0x70, 0x39,
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0x99, 0x7C, 0x3A, 0x85, 0x23, 0xB8, 0xB4, 0x7A, 0xFC, 0x02, 0x36, 0x5B, 0x25, 0x55, 0x97, 0x31,
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0x2D, 0x5D, 0xFA, 0x98, 0xE3, 0x8A, 0x92, 0xAE, 0x05, 0xDF, 0x29, 0x10, 0x67, 0x6C, 0xBA, 0xC9,
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0xD3, 0x00, 0xE6, 0xCF, 0xE1, 0x9E, 0xA8, 0x2C, 0x63, 0x16, 0x01, 0x3F, 0x58, 0xE2, 0x89, 0xA9,
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0x0D, 0x38, 0x34, 0x1B, 0xAB, 0x33, 0xFF, 0xB0, 0xBB, 0x48, 0x0C, 0x5F, 0xB9, 0xB1, 0xCD, 0x2E,
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0xC5, 0xF3, 0xDB, 0x47, 0xE5, 0xA5, 0x9C, 0x77, 0x0A, 0xA6, 0x20, 0x68, 0xFE, 0x7F, 0xC1, 0xAD,
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};
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struct rc2_state {
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ut16 ekey[RC2_KEY_SIZE];
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int key_size;
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};
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// takes a 8-128 len ut8 key
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// expands it to a 64 len ut16 key
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static bool rc2_expandKey(const ut8 *key,
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int key_len, // len(key)
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int bits, // the effective key len in bits
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struct rc2_state *state) {
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int i;
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char tempKey[129];
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if (key_len < 1) return false;
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strncpy(tempKey, (char *) key, sizeof(tempKey) - 1);
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// first loop
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for (i = key_len; i < sizeof(tempKey) - 1; i++) {
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tempKey[i] = PITABLE[(key[i - key_len] + key[i - 1]) & 255];
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}
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int ekey_len = (bits + 7) >> 3; // in bytes
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int mask = 255 >> (8 * ekey_len - bits);
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tempKey[sizeof(tempKey) - 1 - ekey_len] = PITABLE[tempKey[sizeof(tempKey) - 1 - ekey_len] & mask];
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// second loop
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for (i = sizeof(tempKey) - 2 - ekey_len; i >= 0; i--) {
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tempKey[i] = PITABLE[tempKey[i + 1] ^ tempKey[i + ekey_len]];
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}
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// generate the ut16 key
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for (i = 0; i < RC2_KEY_SIZE; i++) {
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state->ekey[i] = (ut8)tempKey[i * 2] + ((ut8)tempKey[i * 2 + 1] << 8);
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}
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return true;
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}
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static void rc2_crypt8(struct rc2_state *state, const ut8 *inbuf, ut8 *outbuf) {
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int i;
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ut16 x76, x54, x32, x10;
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x76 = (inbuf[7] << 8) | inbuf[6];
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x54 = (inbuf[5] << 8) | inbuf[4];
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x32 = (inbuf[3] << 8) | inbuf[2];
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x10 = (inbuf[1] << 8) | inbuf[0];
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for (i = 0; i < 16; i++) {
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x10 += ((x32 & ~x76) | (x54 & x76)) + state->ekey[4 * i + 0];
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x10 = (x10 << 1) | (x10 >> 15 & 1);
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x32 += ((x54 & ~x10) | (x76 & x10)) + state->ekey[4 * i + 1];
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x32 = (x32 << 2) | (x32 >> 14 & 3);
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x54 += ((x76 & ~x32) | (x10 & x32)) + state->ekey[4 * i + 2];
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x54 = (x54 << 3) | (x54 >> 13 & 7);
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x76 += ((x10 & ~x54) | (x32 & x54)) + state->ekey[4 * i + 3];
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x76 = (x76 << 5) | (x76 >> 11 & 31);
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if (i == 4 || i == 10) {
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x10 += state->ekey[x76 & 63];
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x32 += state->ekey[x10 & 63];
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x54 += state->ekey[x32 & 63];
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x76 += state->ekey[x54 & 63];
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}
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}
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outbuf[0] = (ut8) x10;
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outbuf[1] = (ut8) (x10 >> 8);
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outbuf[2] = (ut8) x32;
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outbuf[3] = (ut8) (x32 >> 8);
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outbuf[4] = (ut8) x54;
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outbuf[5] = (ut8) (x54 >> 8);
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outbuf[6] = (ut8) x76;
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outbuf[7] = (ut8) (x76 >> 8);
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}
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static void rc2_dcrypt8(struct rc2_state *state, const ut8 *inbuf, ut8 *outbuf) {
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int i;
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ut16 x76, x54, x32, x10;
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x76 = (inbuf[7] << 8) | inbuf[6];
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x54 = (inbuf[5] << 8) | inbuf[4];
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x32 = (inbuf[3] << 8) | inbuf[2];
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x10 = (inbuf[1] << 8) | inbuf[0];
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for (i = 15; i >= 0; i--) {
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x76 = (x76 << 11) | (x76 >> 5);
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x76 -= ((x10 & ~x54) | (x32 & x54)) + state->ekey[4 * i + 3];
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x54 = (x54 << 13) | (x54 >> 3);
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x54 -= ((x76 & ~x32) | (x10 & x32)) + state->ekey[4 * i + 2];
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x32 = (x32 << 14) | (x32 >> 2);
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x32 -= ((x54 & ~x10) | (x76 & x10)) + state->ekey[4 * i + 1];
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x10 = (x10 << 15) | (x10 >> 1);
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x10 -= ((x32 & ~x76) | (x54 & x76)) + state->ekey[4 * i + 0];
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if (i == 5 || i == 11) {
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x76 -= state->ekey[x54 & 63];
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x54 -= state->ekey[x32 & 63];
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x32 -= state->ekey[x10 & 63];
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x10 -= state->ekey[x76 & 63];
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}
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}
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outbuf[0] = (ut8) x10;
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outbuf[1] = (ut8) (x10 >> 8);
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outbuf[2] = (ut8) x32;
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outbuf[3] = (ut8) (x32 >> 8);
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outbuf[4] = (ut8) x54;
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outbuf[5] = (ut8) (x54 >> 8);
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outbuf[6] = (ut8) x76;
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outbuf[7] = (ut8) (x76 >> 8);
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}
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static void rc2_dcrypt(struct rc2_state *state, const ut8 *inbuf, ut8 *outbuf, int buflen) {
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int i;
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char data_block[BLOCK_SIZE + 1] = {0};
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int idx = 0;
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char dcrypted_block[BLOCK_SIZE + 1] = {0};
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char *ptr = (char *) outbuf;
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for (i = 0; i < buflen; i++) {
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data_block[idx] = inbuf[i];
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idx += 1;
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if (idx % BLOCK_SIZE == 0) {
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rc2_dcrypt8(state, (const ut8 *) data_block, (ut8 *) dcrypted_block);
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strncpy(ptr, dcrypted_block, BLOCK_SIZE);
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ptr += BLOCK_SIZE;
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idx = 0;
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}
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}
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}
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static void rc2_crypt(struct rc2_state *state, const ut8 *inbuf, ut8 *outbuf, int buflen) {
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int i;
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char data_block[BLOCK_SIZE] = {0};
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int idx = 0;
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char crypted_block[BLOCK_SIZE] = {0};
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char *ptr = (char *) outbuf;
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// divide it into blocks of BLOCK_SIZE
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for (i = 0; i < buflen; i++) {
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data_block[idx] = inbuf[i];
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idx += 1;
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if (idx % BLOCK_SIZE == 0) {
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rc2_crypt8(state, (const ut8 *) data_block, (ut8 *) crypted_block);
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strncpy(ptr, crypted_block, BLOCK_SIZE);
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ptr += BLOCK_SIZE;
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idx = 0;
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}
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}
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if (idx % 8) {
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while(idx % 8) data_block[idx++] = 0;
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rc2_crypt8(state, (const ut8 *) data_block, (ut8 *) crypted_block);
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strncpy(ptr, crypted_block, 8);
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}
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}
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///////////////////////////////////////////////////////////
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static struct rc2_state state;
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static int rc2_set_key(RCrypto *cry, const ut8 *key, int keylen, int mode, int direction) {
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state.key_size = keylen;
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return rc2_expandKey(key, keylen, BITS, &state);
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}
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static int rc2_get_key_size(RCrypto *cry) {
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return state.key_size;
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}
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static bool rc2_use(const char *algo) {
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return !strcmp (algo, "rc2");
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}
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static int update(RCrypto *cry, const ut8 *buf, int len) {
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ut8 *obuf = calloc (1, len);
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if (!obuf) return false;
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rc2_crypt(&state, buf, obuf, len);
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r_crypto_append(cry, obuf, len);
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free (obuf);
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return 0;
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}
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static int final(RCrypto *cry, const ut8 *buf, int len) {
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return update (cry, buf, len);
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}
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RCryptoPlugin r_crypto_plugin_rc2 = {
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.name = "rc2",
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.set_key = rc2_set_key,
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.get_key_size = rc2_get_key_size,
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.use = rc2_use,
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.update = update,
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.final = final
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};
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#ifndef CORELIB
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struct r_lib_struct_t radare_plugin = {
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.type = R_LIB_TYPE_CRYPTO,
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.data = &r_crypto_plugin_rc2,
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.version = R2_VERSION
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};
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#endif
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#if 1
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int main() {
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ut8 out[16];
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struct rc2_state st;
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st.key_size = 3;
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/* encrypt */
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rc2_expandKey ((const ut8*)"key", 3, BITS, &st);
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rc2_crypt(&st, (const ut8 *)"12345678abc", out, 11);
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eprintf ("%s\n", (const char *)out);
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rc2_dcrypt(&st, (const ut8 *)out, out, sizeof(out));
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eprintf ("%s\n", (const char *)out);
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return 0;
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}
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#endif
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9
libr/crypto/p/rc2.mk
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9
libr/crypto/p/rc2.mk
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@ -0,0 +1,9 @@
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OBJ_RC2=crypto_rc2.o
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STATIC_OBJ+=${OBJ_RC2}
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TARGET_RC2=crypto_rc2.${EXT_SO}
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ALL_TARGETS+=${TARGET_RC2}
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${TARGET_RC2}: ${OBJ_RC2}
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${CC} $(call libname,crypto_rc2) ${LDFLAGS} ${CFLAGS} -o ${TARGET_RC2} ${OBJ_RC2}
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@ -65,6 +65,7 @@ extern RCryptoPlugin r_crypto_plugin_aes;
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extern RCryptoPlugin r_crypto_plugin_rc4;
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extern RCryptoPlugin r_crypto_plugin_xor;
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extern RCryptoPlugin r_crypto_plugin_blowfish;
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extern RCryptoPlugin r_crypto_plugin_rc2;
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#ifdef __cplusplus
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}
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@ -152,6 +152,7 @@ crypto.aes
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crypto.rc4
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crypto.xor
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crypto.blowfish
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crypto.rc2
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debug.bf
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debug.esil
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debug.gdb
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