X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=libtomcrypt%2Fsrc%2Fciphers%2Fsafer%2Fsaferp.c;fp=libtomcrypt%2Fsrc%2Fciphers%2Fsafer%2Fsaferp.c;h=116590ff68a98c5c60fa34a5f26ca8708cb9fcba;hb=66bc25938679f1d6a1d1200f329093d82a5e99b4;hp=0000000000000000000000000000000000000000;hpb=a52ee0733f420ca20224049260d6fc5cf7d8f621;p=zpackage diff --git a/libtomcrypt/src/ciphers/safer/saferp.c b/libtomcrypt/src/ciphers/safer/saferp.c new file mode 100644 index 0000000..116590f --- /dev/null +++ b/libtomcrypt/src/ciphers/safer/saferp.c @@ -0,0 +1,568 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + */ + +/** + @file saferp.c + LTC_SAFER+ Implementation by Tom St Denis +*/ +#include "tomcrypt.h" + +#ifdef LTC_SAFERP + +#define __LTC_SAFER_TAB_C__ +#include "safer_tab.c" + +const struct ltc_cipher_descriptor saferp_desc = +{ + "safer+", + 4, + 16, 32, 16, 8, + &saferp_setup, + &saferp_ecb_encrypt, + &saferp_ecb_decrypt, + &saferp_test, + &saferp_done, + &saferp_keysize, + NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL +}; + +/* ROUND(b,i) + * + * This is one forward key application. Note the basic form is + * key addition, substitution, key addition. The safer_ebox and safer_lbox + * are the exponentiation box and logarithm boxes respectively. + * The value of 'i' is the current round number which allows this + * function to be unrolled massively. Most of LTC_SAFER+'s speed + * comes from not having to compute indirect accesses into the + * array of 16 bytes b[0..15] which is the block of data +*/ + +#define ROUND(b, i) do { \ + b[0] = (safer_ebox[(b[0] ^ skey->saferp.K[i][0]) & 255] + skey->saferp.K[i+1][0]) & 255; \ + b[1] = safer_lbox[(b[1] + skey->saferp.K[i][1]) & 255] ^ skey->saferp.K[i+1][1]; \ + b[2] = safer_lbox[(b[2] + skey->saferp.K[i][2]) & 255] ^ skey->saferp.K[i+1][2]; \ + b[3] = (safer_ebox[(b[3] ^ skey->saferp.K[i][3]) & 255] + skey->saferp.K[i+1][3]) & 255; \ + b[4] = (safer_ebox[(b[4] ^ skey->saferp.K[i][4]) & 255] + skey->saferp.K[i+1][4]) & 255; \ + b[5] = safer_lbox[(b[5] + skey->saferp.K[i][5]) & 255] ^ skey->saferp.K[i+1][5]; \ + b[6] = safer_lbox[(b[6] + skey->saferp.K[i][6]) & 255] ^ skey->saferp.K[i+1][6]; \ + b[7] = (safer_ebox[(b[7] ^ skey->saferp.K[i][7]) & 255] + skey->saferp.K[i+1][7]) & 255; \ + b[8] = (safer_ebox[(b[8] ^ skey->saferp.K[i][8]) & 255] + skey->saferp.K[i+1][8]) & 255; \ + b[9] = safer_lbox[(b[9] + skey->saferp.K[i][9]) & 255] ^ skey->saferp.K[i+1][9]; \ + b[10] = safer_lbox[(b[10] + skey->saferp.K[i][10]) & 255] ^ skey->saferp.K[i+1][10]; \ + b[11] = (safer_ebox[(b[11] ^ skey->saferp.K[i][11]) & 255] + skey->saferp.K[i+1][11]) & 255; \ + b[12] = (safer_ebox[(b[12] ^ skey->saferp.K[i][12]) & 255] + skey->saferp.K[i+1][12]) & 255; \ + b[13] = safer_lbox[(b[13] + skey->saferp.K[i][13]) & 255] ^ skey->saferp.K[i+1][13]; \ + b[14] = safer_lbox[(b[14] + skey->saferp.K[i][14]) & 255] ^ skey->saferp.K[i+1][14]; \ + b[15] = (safer_ebox[(b[15] ^ skey->saferp.K[i][15]) & 255] + skey->saferp.K[i+1][15]) & 255; \ +} while (0) + +/* This is one inverse key application */ +#define iROUND(b, i) do { \ + b[0] = safer_lbox[(b[0] - skey->saferp.K[i+1][0]) & 255] ^ skey->saferp.K[i][0]; \ + b[1] = (safer_ebox[(b[1] ^ skey->saferp.K[i+1][1]) & 255] - skey->saferp.K[i][1]) & 255; \ + b[2] = (safer_ebox[(b[2] ^ skey->saferp.K[i+1][2]) & 255] - skey->saferp.K[i][2]) & 255; \ + b[3] = safer_lbox[(b[3] - skey->saferp.K[i+1][3]) & 255] ^ skey->saferp.K[i][3]; \ + b[4] = safer_lbox[(b[4] - skey->saferp.K[i+1][4]) & 255] ^ skey->saferp.K[i][4]; \ + b[5] = (safer_ebox[(b[5] ^ skey->saferp.K[i+1][5]) & 255] - skey->saferp.K[i][5]) & 255; \ + b[6] = (safer_ebox[(b[6] ^ skey->saferp.K[i+1][6]) & 255] - skey->saferp.K[i][6]) & 255; \ + b[7] = safer_lbox[(b[7] - skey->saferp.K[i+1][7]) & 255] ^ skey->saferp.K[i][7]; \ + b[8] = safer_lbox[(b[8] - skey->saferp.K[i+1][8]) & 255] ^ skey->saferp.K[i][8]; \ + b[9] = (safer_ebox[(b[9] ^ skey->saferp.K[i+1][9]) & 255] - skey->saferp.K[i][9]) & 255; \ + b[10] = (safer_ebox[(b[10] ^ skey->saferp.K[i+1][10]) & 255] - skey->saferp.K[i][10]) & 255; \ + b[11] = safer_lbox[(b[11] - skey->saferp.K[i+1][11]) & 255] ^ skey->saferp.K[i][11]; \ + b[12] = safer_lbox[(b[12] - skey->saferp.K[i+1][12]) & 255] ^ skey->saferp.K[i][12]; \ + b[13] = (safer_ebox[(b[13] ^ skey->saferp.K[i+1][13]) & 255] - skey->saferp.K[i][13]) & 255; \ + b[14] = (safer_ebox[(b[14] ^ skey->saferp.K[i+1][14]) & 255] - skey->saferp.K[i][14]) & 255; \ + b[15] = safer_lbox[(b[15] - skey->saferp.K[i+1][15]) & 255] ^ skey->saferp.K[i][15]; \ +} while (0) + +/* This is a forward single layer PHT transform. */ +#define PHT(b) do { \ + b[0] = (b[0] + (b[1] = (b[0] + b[1]) & 255)) & 255; \ + b[2] = (b[2] + (b[3] = (b[3] + b[2]) & 255)) & 255; \ + b[4] = (b[4] + (b[5] = (b[5] + b[4]) & 255)) & 255; \ + b[6] = (b[6] + (b[7] = (b[7] + b[6]) & 255)) & 255; \ + b[8] = (b[8] + (b[9] = (b[9] + b[8]) & 255)) & 255; \ + b[10] = (b[10] + (b[11] = (b[11] + b[10]) & 255)) & 255; \ + b[12] = (b[12] + (b[13] = (b[13] + b[12]) & 255)) & 255; \ + b[14] = (b[14] + (b[15] = (b[15] + b[14]) & 255)) & 255; \ +} while (0) + +/* This is an inverse single layer PHT transform */ +#define iPHT(b) do { \ + b[15] = (b[15] - (b[14] = (b[14] - b[15]) & 255)) & 255; \ + b[13] = (b[13] - (b[12] = (b[12] - b[13]) & 255)) & 255; \ + b[11] = (b[11] - (b[10] = (b[10] - b[11]) & 255)) & 255; \ + b[9] = (b[9] - (b[8] = (b[8] - b[9]) & 255)) & 255; \ + b[7] = (b[7] - (b[6] = (b[6] - b[7]) & 255)) & 255; \ + b[5] = (b[5] - (b[4] = (b[4] - b[5]) & 255)) & 255; \ + b[3] = (b[3] - (b[2] = (b[2] - b[3]) & 255)) & 255; \ + b[1] = (b[1] - (b[0] = (b[0] - b[1]) & 255)) & 255; \ + } while (0) + +/* This is the "Armenian" Shuffle. It takes the input from b and stores it in b2 */ +#define SHUF(b, b2) do { \ + b2[0] = b[8]; b2[1] = b[11]; b2[2] = b[12]; b2[3] = b[15]; \ + b2[4] = b[2]; b2[5] = b[1]; b2[6] = b[6]; b2[7] = b[5]; \ + b2[8] = b[10]; b2[9] = b[9]; b2[10] = b[14]; b2[11] = b[13]; \ + b2[12] = b[0]; b2[13] = b[7]; b2[14] = b[4]; b2[15] = b[3]; \ +} while (0) + +/* This is the inverse shuffle. It takes from b and gives to b2 */ +#define iSHUF(b, b2) do { \ + b2[0] = b[12]; b2[1] = b[5]; b2[2] = b[4]; b2[3] = b[15]; \ + b2[4] = b[14]; b2[5] = b[7]; b2[6] = b[6]; b2[7] = b[13]; \ + b2[8] = b[0]; b2[9] = b[9]; b2[10] = b[8]; b2[11] = b[1]; \ + b2[12] = b[2]; b2[13] = b[11]; b2[14] = b[10]; b2[15] = b[3]; \ +} while (0) + +/* The complete forward Linear Transform layer. + * Note that alternating usage of b and b2. + * Each round of LT starts in 'b' and ends in 'b2'. + */ +#define LT(b, b2) do { \ + PHT(b); SHUF(b, b2); \ + PHT(b2); SHUF(b2, b); \ + PHT(b); SHUF(b, b2); \ + PHT(b2); \ +} while (0) + +/* This is the inverse linear transform layer. */ +#define iLT(b, b2) do { \ + iPHT(b); \ + iSHUF(b, b2); iPHT(b2); \ + iSHUF(b2, b); iPHT(b); \ + iSHUF(b, b2); iPHT(b2); \ +} while (0) + +#ifdef LTC_SMALL_CODE + +static void _round(unsigned char *b, int i, symmetric_key *skey) +{ + ROUND(b, i); +} + +static void _iround(unsigned char *b, int i, symmetric_key *skey) +{ + iROUND(b, i); +} + +static void _lt(unsigned char *b, unsigned char *b2) +{ + LT(b, b2); +} + +static void _ilt(unsigned char *b, unsigned char *b2) +{ + iLT(b, b2); +} + +#undef ROUND +#define ROUND(b, i) _round(b, i, skey) + +#undef iROUND +#define iROUND(b, i) _iround(b, i, skey) + +#undef LT +#define LT(b, b2) _lt(b, b2) + +#undef iLT +#define iLT(b, b2) _ilt(b, b2) + +#endif + +/* These are the 33, 128-bit bias words for the key schedule */ +static const unsigned char safer_bias[33][16] = { +{ 70, 151, 177, 186, 163, 183, 16, 10, 197, 55, 179, 201, 90, 40, 172, 100}, +{ 236, 171, 170, 198, 103, 149, 88, 13, 248, 154, 246, 110, 102, 220, 5, 61}, +{ 138, 195, 216, 137, 106, 233, 54, 73, 67, 191, 235, 212, 150, 155, 104, 160}, +{ 93, 87, 146, 31, 213, 113, 92, 187, 34, 193, 190, 123, 188, 153, 99, 148}, +{ 42, 97, 184, 52, 50, 25, 253, 251, 23, 64, 230, 81, 29, 65, 68, 143}, +{ 221, 4, 128, 222, 231, 49, 214, 127, 1, 162, 247, 57, 218, 111, 35, 202}, +{ 58, 208, 28, 209, 48, 62, 18, 161, 205, 15, 224, 168, 175, 130, 89, 44}, +{ 125, 173, 178, 239, 194, 135, 206, 117, 6, 19, 2, 144, 79, 46, 114, 51}, +{ 192, 141, 207, 169, 129, 226, 196, 39, 47, 108, 122, 159, 82, 225, 21, 56}, +{ 252, 32, 66, 199, 8, 228, 9, 85, 94, 140, 20, 118, 96, 255, 223, 215}, +{ 250, 11, 33, 0, 26, 249, 166, 185, 232, 158, 98, 76, 217, 145, 80, 210}, +{ 24, 180, 7, 132, 234, 91, 164, 200, 14, 203, 72, 105, 75, 78, 156, 53}, +{ 69, 77, 84, 229, 37, 60, 12, 74, 139, 63, 204, 167, 219, 107, 174, 244}, +{ 45, 243, 124, 109, 157, 181, 38, 116, 242, 147, 83, 176, 240, 17, 237, 131}, +{ 182, 3, 22, 115, 59, 30, 142, 112, 189, 134, 27, 71, 126, 36, 86, 241}, +{ 136, 70, 151, 177, 186, 163, 183, 16, 10, 197, 55, 179, 201, 90, 40, 172}, +{ 220, 134, 119, 215, 166, 17, 251, 244, 186, 146, 145, 100, 131, 241, 51, 239}, +{ 44, 181, 178, 43, 136, 209, 153, 203, 140, 132, 29, 20, 129, 151, 113, 202}, +{ 163, 139, 87, 60, 130, 196, 82, 92, 28, 232, 160, 4, 180, 133, 74, 246}, +{ 84, 182, 223, 12, 26, 142, 222, 224, 57, 252, 32, 155, 36, 78, 169, 152}, +{ 171, 242, 96, 208, 108, 234, 250, 199, 217, 0, 212, 31, 110, 67, 188, 236}, +{ 137, 254, 122, 93, 73, 201, 50, 194, 249, 154, 248, 109, 22, 219, 89, 150}, +{ 233, 205, 230, 70, 66, 143, 10, 193, 204, 185, 101, 176, 210, 198, 172, 30}, +{ 98, 41, 46, 14, 116, 80, 2, 90, 195, 37, 123, 138, 42, 91, 240, 6}, +{ 71, 111, 112, 157, 126, 16, 206, 18, 39, 213, 76, 79, 214, 121, 48, 104}, +{ 117, 125, 228, 237, 128, 106, 144, 55, 162, 94, 118, 170, 197, 127, 61, 175}, +{ 229, 25, 97, 253, 77, 124, 183, 11, 238, 173, 75, 34, 245, 231, 115, 35}, +{ 200, 5, 225, 102, 221, 179, 88, 105, 99, 86, 15, 161, 49, 149, 23, 7}, +{ 40, 1, 45, 226, 147, 190, 69, 21, 174, 120, 3, 135, 164, 184, 56, 207}, +{ 8, 103, 9, 148, 235, 38, 168, 107, 189, 24, 52, 27, 187, 191, 114, 247}, +{ 53, 72, 156, 81, 47, 59, 85, 227, 192, 159, 216, 211, 243, 141, 177, 255}, +{ 62, 220, 134, 119, 215, 166, 17, 251, 244, 186, 146, 145, 100, 131, 241, 51}}; + + /** + Initialize the LTC_SAFER+ block cipher + @param key The symmetric key you wish to pass + @param keylen The key length in bytes + @param num_rounds The number of rounds desired (0 for default) + @param skey The key in as scheduled by this function. + @return CRYPT_OK if successful + */ +int saferp_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey) +{ + unsigned x, y, z; + unsigned char t[33]; + static const int rounds[3] = { 8, 12, 16 }; + + LTC_ARGCHK(key != NULL); + LTC_ARGCHK(skey != NULL); + + /* check arguments */ + if (keylen != 16 && keylen != 24 && keylen != 32) { + return CRYPT_INVALID_KEYSIZE; + } + + /* Is the number of rounds valid? Either use zero for default or + * 8,12,16 rounds for 16,24,32 byte keys + */ + if (num_rounds != 0 && num_rounds != rounds[(keylen/8)-2]) { + return CRYPT_INVALID_ROUNDS; + } + + /* 128 bit key version */ + if (keylen == 16) { + /* copy key into t */ + for (x = y = 0; x < 16; x++) { + t[x] = key[x]; + y ^= key[x]; + } + t[16] = y; + + /* make round keys */ + for (x = 0; x < 16; x++) { + skey->saferp.K[0][x] = t[x]; + } + + /* make the 16 other keys as a transformation of the first key */ + for (x = 1; x < 17; x++) { + /* rotate 3 bits each */ + for (y = 0; y < 17; y++) { + t[y] = ((t[y]<<3)|(t[y]>>5)) & 255; + } + + /* select and add */ + z = x; + for (y = 0; y < 16; y++) { + skey->saferp.K[x][y] = (t[z] + safer_bias[x-1][y]) & 255; + if (++z == 17) { z = 0; } + } + } + skey->saferp.rounds = 8; + } else if (keylen == 24) { + /* copy key into t */ + for (x = y = 0; x < 24; x++) { + t[x] = key[x]; + y ^= key[x]; + } + t[24] = y; + + /* make round keys */ + for (x = 0; x < 16; x++) { + skey->saferp.K[0][x] = t[x]; + } + + for (x = 1; x < 25; x++) { + /* rotate 3 bits each */ + for (y = 0; y < 25; y++) { + t[y] = ((t[y]<<3)|(t[y]>>5)) & 255; + } + + /* select and add */ + z = x; + for (y = 0; y < 16; y++) { + skey->saferp.K[x][y] = (t[z] + safer_bias[x-1][y]) & 255; + if (++z == 25) { z = 0; } + } + } + skey->saferp.rounds = 12; + } else { + /* copy key into t */ + for (x = y = 0; x < 32; x++) { + t[x] = key[x]; + y ^= key[x]; + } + t[32] = y; + + /* make round keys */ + for (x = 0; x < 16; x++) { + skey->saferp.K[0][x] = t[x]; + } + + for (x = 1; x < 33; x++) { + /* rotate 3 bits each */ + for (y = 0; y < 33; y++) { + t[y] = ((t[y]<<3)|(t[y]>>5)) & 255; + } + + /* select and add */ + z = x; + for (y = 0; y < 16; y++) { + skey->saferp.K[x][y] = (t[z] + safer_bias[x-1][y]) & 255; + if (++z == 33) { z = 0; } + } + } + skey->saferp.rounds = 16; + } +#ifdef LTC_CLEAN_STACK + zeromem(t, sizeof(t)); +#endif + return CRYPT_OK; +} + +/** + Encrypts a block of text with LTC_SAFER+ + @param pt The input plaintext (16 bytes) + @param ct The output ciphertext (16 bytes) + @param skey The key as scheduled + @return CRYPT_OK if successful +*/ +int saferp_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey) +{ + unsigned char b[16]; + int x; + + LTC_ARGCHK(pt != NULL); + LTC_ARGCHK(ct != NULL); + LTC_ARGCHK(skey != NULL); + + /* do eight rounds */ + for (x = 0; x < 16; x++) { + b[x] = pt[x]; + } + ROUND(b, 0); LT(b, ct); + ROUND(ct, 2); LT(ct, b); + ROUND(b, 4); LT(b, ct); + ROUND(ct, 6); LT(ct, b); + ROUND(b, 8); LT(b, ct); + ROUND(ct, 10); LT(ct, b); + ROUND(b, 12); LT(b, ct); + ROUND(ct, 14); LT(ct, b); + /* 192-bit key? */ + if (skey->saferp.rounds > 8) { + ROUND(b, 16); LT(b, ct); + ROUND(ct, 18); LT(ct, b); + ROUND(b, 20); LT(b, ct); + ROUND(ct, 22); LT(ct, b); + } + /* 256-bit key? */ + if (skey->saferp.rounds > 12) { + ROUND(b, 24); LT(b, ct); + ROUND(ct, 26); LT(ct, b); + ROUND(b, 28); LT(b, ct); + ROUND(ct, 30); LT(ct, b); + } + ct[0] = b[0] ^ skey->saferp.K[skey->saferp.rounds*2][0]; + ct[1] = (b[1] + skey->saferp.K[skey->saferp.rounds*2][1]) & 255; + ct[2] = (b[2] + skey->saferp.K[skey->saferp.rounds*2][2]) & 255; + ct[3] = b[3] ^ skey->saferp.K[skey->saferp.rounds*2][3]; + ct[4] = b[4] ^ skey->saferp.K[skey->saferp.rounds*2][4]; + ct[5] = (b[5] + skey->saferp.K[skey->saferp.rounds*2][5]) & 255; + ct[6] = (b[6] + skey->saferp.K[skey->saferp.rounds*2][6]) & 255; + ct[7] = b[7] ^ skey->saferp.K[skey->saferp.rounds*2][7]; + ct[8] = b[8] ^ skey->saferp.K[skey->saferp.rounds*2][8]; + ct[9] = (b[9] + skey->saferp.K[skey->saferp.rounds*2][9]) & 255; + ct[10] = (b[10] + skey->saferp.K[skey->saferp.rounds*2][10]) & 255; + ct[11] = b[11] ^ skey->saferp.K[skey->saferp.rounds*2][11]; + ct[12] = b[12] ^ skey->saferp.K[skey->saferp.rounds*2][12]; + ct[13] = (b[13] + skey->saferp.K[skey->saferp.rounds*2][13]) & 255; + ct[14] = (b[14] + skey->saferp.K[skey->saferp.rounds*2][14]) & 255; + ct[15] = b[15] ^ skey->saferp.K[skey->saferp.rounds*2][15]; +#ifdef LTC_CLEAN_STACK + zeromem(b, sizeof(b)); +#endif + return CRYPT_OK; +} + +/** + Decrypts a block of text with LTC_SAFER+ + @param ct The input ciphertext (16 bytes) + @param pt The output plaintext (16 bytes) + @param skey The key as scheduled + @return CRYPT_OK if successful +*/ +int saferp_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey) +{ + unsigned char b[16]; + int x; + + LTC_ARGCHK(pt != NULL); + LTC_ARGCHK(ct != NULL); + LTC_ARGCHK(skey != NULL); + + /* do eight rounds */ + b[0] = ct[0] ^ skey->saferp.K[skey->saferp.rounds*2][0]; + b[1] = (ct[1] - skey->saferp.K[skey->saferp.rounds*2][1]) & 255; + b[2] = (ct[2] - skey->saferp.K[skey->saferp.rounds*2][2]) & 255; + b[3] = ct[3] ^ skey->saferp.K[skey->saferp.rounds*2][3]; + b[4] = ct[4] ^ skey->saferp.K[skey->saferp.rounds*2][4]; + b[5] = (ct[5] - skey->saferp.K[skey->saferp.rounds*2][5]) & 255; + b[6] = (ct[6] - skey->saferp.K[skey->saferp.rounds*2][6]) & 255; + b[7] = ct[7] ^ skey->saferp.K[skey->saferp.rounds*2][7]; + b[8] = ct[8] ^ skey->saferp.K[skey->saferp.rounds*2][8]; + b[9] = (ct[9] - skey->saferp.K[skey->saferp.rounds*2][9]) & 255; + b[10] = (ct[10] - skey->saferp.K[skey->saferp.rounds*2][10]) & 255; + b[11] = ct[11] ^ skey->saferp.K[skey->saferp.rounds*2][11]; + b[12] = ct[12] ^ skey->saferp.K[skey->saferp.rounds*2][12]; + b[13] = (ct[13] - skey->saferp.K[skey->saferp.rounds*2][13]) & 255; + b[14] = (ct[14] - skey->saferp.K[skey->saferp.rounds*2][14]) & 255; + b[15] = ct[15] ^ skey->saferp.K[skey->saferp.rounds*2][15]; + /* 256-bit key? */ + if (skey->saferp.rounds > 12) { + iLT(b, pt); iROUND(pt, 30); + iLT(pt, b); iROUND(b, 28); + iLT(b, pt); iROUND(pt, 26); + iLT(pt, b); iROUND(b, 24); + } + /* 192-bit key? */ + if (skey->saferp.rounds > 8) { + iLT(b, pt); iROUND(pt, 22); + iLT(pt, b); iROUND(b, 20); + iLT(b, pt); iROUND(pt, 18); + iLT(pt, b); iROUND(b, 16); + } + iLT(b, pt); iROUND(pt, 14); + iLT(pt, b); iROUND(b, 12); + iLT(b, pt); iROUND(pt,10); + iLT(pt, b); iROUND(b, 8); + iLT(b, pt); iROUND(pt,6); + iLT(pt, b); iROUND(b, 4); + iLT(b, pt); iROUND(pt,2); + iLT(pt, b); iROUND(b, 0); + for (x = 0; x < 16; x++) { + pt[x] = b[x]; + } +#ifdef LTC_CLEAN_STACK + zeromem(b, sizeof(b)); +#endif + return CRYPT_OK; +} + +/** + Performs a self-test of the LTC_SAFER+ block cipher + @return CRYPT_OK if functional, CRYPT_NOP if self-test has been disabled +*/ +int saferp_test(void) +{ + #ifndef LTC_TEST + return CRYPT_NOP; + #else + static const struct { + int keylen; + unsigned char key[32], pt[16], ct[16]; + } tests[] = { + { + 16, + { 41, 35, 190, 132, 225, 108, 214, 174, + 82, 144, 73, 241, 241, 187, 233, 235 }, + { 179, 166, 219, 60, 135, 12, 62, 153, + 36, 94, 13, 28, 6, 183, 71, 222 }, + { 224, 31, 182, 10, 12, 255, 84, 70, + 127, 13, 89, 249, 9, 57, 165, 220 } + }, { + 24, + { 72, 211, 143, 117, 230, 217, 29, 42, + 229, 192, 247, 43, 120, 129, 135, 68, + 14, 95, 80, 0, 212, 97, 141, 190 }, + { 123, 5, 21, 7, 59, 51, 130, 31, + 24, 112, 146, 218, 100, 84, 206, 177 }, + { 92, 136, 4, 63, 57, 95, 100, 0, + 150, 130, 130, 16, 193, 111, 219, 133 } + }, { + 32, + { 243, 168, 141, 254, 190, 242, 235, 113, + 255, 160, 208, 59, 117, 6, 140, 126, + 135, 120, 115, 77, 208, 190, 130, 190, + 219, 194, 70, 65, 43, 140, 250, 48 }, + { 127, 112, 240, 167, 84, 134, 50, 149, + 170, 91, 104, 19, 11, 230, 252, 245 }, + { 88, 11, 25, 36, 172, 229, 202, 213, + 170, 65, 105, 153, 220, 104, 153, 138 } + } + }; + + unsigned char tmp[2][16]; + symmetric_key skey; + int err, i, y; + + for (i = 0; i < (int)(sizeof(tests) / sizeof(tests[0])); i++) { + if ((err = saferp_setup(tests[i].key, tests[i].keylen, 0, &skey)) != CRYPT_OK) { + return err; + } + saferp_ecb_encrypt(tests[i].pt, tmp[0], &skey); + saferp_ecb_decrypt(tmp[0], tmp[1], &skey); + + /* compare */ + if (compare_testvector(tmp[0], 16, tests[i].ct, 16, "Safer+ Encrypt", i) || + compare_testvector(tmp[1], 16, tests[i].pt, 16, "Safer+ Decrypt", i)) { + return CRYPT_FAIL_TESTVECTOR; + } + + /* now see if we can encrypt all zero bytes 1000 times, decrypt and come back where we started */ + for (y = 0; y < 16; y++) tmp[0][y] = 0; + for (y = 0; y < 1000; y++) saferp_ecb_encrypt(tmp[0], tmp[0], &skey); + for (y = 0; y < 1000; y++) saferp_ecb_decrypt(tmp[0], tmp[0], &skey); + for (y = 0; y < 16; y++) if (tmp[0][y] != 0) return CRYPT_FAIL_TESTVECTOR; + } + + return CRYPT_OK; + #endif +} + +/** Terminate the context + @param skey The scheduled key +*/ +void saferp_done(symmetric_key *skey) +{ + LTC_UNUSED_PARAM(skey); +} + +/** + Gets suitable key size + @param keysize [in/out] The length of the recommended key (in bytes). This function will store the suitable size back in this variable. + @return CRYPT_OK if the input key size is acceptable. +*/ +int saferp_keysize(int *keysize) +{ + LTC_ARGCHK(keysize != NULL); + + if (*keysize < 16) + return CRYPT_INVALID_KEYSIZE; + if (*keysize < 24) { + *keysize = 16; + } else if (*keysize < 32) { + *keysize = 24; + } else { + *keysize = 32; + } + return CRYPT_OK; +} + +#endif + + + +/* ref: $Format:%D$ */ +/* git commit: $Format:%H$ */ +/* commit time: $Format:%ai$ */