X-Git-Url: https://pd.if.org/git/?p=zpackage;a=blobdiff_plain;f=libtomcrypt%2Fsrc%2Fprngs%2Frc4.c;fp=libtomcrypt%2Fsrc%2Fprngs%2Frc4.c;h=0000000000000000000000000000000000000000;hp=e2aa92175e76bc6255fc3d5ab5729b2ca12e610a;hb=2a3d80be326e401f9008d695232fe5543c909d18;hpb=7955b22e032857bed284c22c5303c0a289b4bd71 diff --git a/libtomcrypt/src/prngs/rc4.c b/libtomcrypt/src/prngs/rc4.c deleted file mode 100644 index e2aa921..0000000 --- a/libtomcrypt/src/prngs/rc4.c +++ /dev/null @@ -1,250 +0,0 @@ -/* 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. - */ -#include "tomcrypt.h" - -/** - @file prngs/rc4.c - RC4 PRNG, Tom St Denis -*/ - -#ifdef LTC_RC4 - -const struct ltc_prng_descriptor rc4_desc = -{ - "rc4", - 32, - &rc4_start, - &rc4_add_entropy, - &rc4_ready, - &rc4_read, - &rc4_done, - &rc4_export, - &rc4_import, - &rc4_test -}; - -/** - Start the PRNG - @param prng [out] The PRNG state to initialize - @return CRYPT_OK if successful -*/ -int rc4_start(prng_state *prng) -{ - LTC_ARGCHK(prng != NULL); - prng->ready = 0; - /* set entropy (key) size to zero */ - prng->rc4.s.x = 0; - /* clear entropy (key) buffer */ - XMEMSET(&prng->rc4.s.buf, 0, sizeof(prng->rc4.s.buf)); - LTC_MUTEX_INIT(&prng->lock) - return CRYPT_OK; -} - -/** - Add entropy to the PRNG state - @param in The data to add - @param inlen Length of the data to add - @param prng PRNG state to update - @return CRYPT_OK if successful -*/ -int rc4_add_entropy(const unsigned char *in, unsigned long inlen, prng_state *prng) -{ - unsigned char buf[256]; - unsigned long i; - int err; - - LTC_ARGCHK(prng != NULL); - LTC_ARGCHK(in != NULL); - LTC_ARGCHK(inlen > 0); - - LTC_MUTEX_LOCK(&prng->lock); - if (prng->ready) { - /* rc4_ready() was already called, do "rekey" operation */ - if ((err = rc4_stream_keystream(&prng->rc4.s, buf, sizeof(buf))) != CRYPT_OK) goto LBL_UNLOCK; - for(i = 0; i < inlen; i++) buf[i % sizeof(buf)] ^= in[i]; - /* initialize RC4 */ - if ((err = rc4_stream_setup(&prng->rc4.s, buf, sizeof(buf))) != CRYPT_OK) goto LBL_UNLOCK; - /* drop first 3072 bytes - https://en.wikipedia.org/wiki/RC4#Fluhrer.2C_Mantin_and_Shamir_attack */ - for (i = 0; i < 12; i++) rc4_stream_keystream(&prng->rc4.s, buf, sizeof(buf)); - zeromem(buf, sizeof(buf)); - } - else { - /* rc4_ready() was not called yet, add entropy to the buffer */ - while (inlen--) prng->rc4.s.buf[prng->rc4.s.x++ % sizeof(prng->rc4.s.buf)] ^= *in++; - } - err = CRYPT_OK; -LBL_UNLOCK: - LTC_MUTEX_UNLOCK(&prng->lock); - return err; -} - -/** - Make the PRNG ready to read from - @param prng The PRNG to make active - @return CRYPT_OK if successful -*/ -int rc4_ready(prng_state *prng) -{ - unsigned char buf[256] = { 0 }; - unsigned long len; - int err, i; - - LTC_ARGCHK(prng != NULL); - - LTC_MUTEX_LOCK(&prng->lock); - if (prng->ready) { err = CRYPT_OK; goto LBL_UNLOCK; } - XMEMCPY(buf, prng->rc4.s.buf, sizeof(buf)); - /* initialize RC4 */ - len = MIN(prng->rc4.s.x, 256); /* TODO: we can perhaps always use all 256 bytes */ - if ((err = rc4_stream_setup(&prng->rc4.s, buf, len)) != CRYPT_OK) goto LBL_UNLOCK; - /* drop first 3072 bytes - https://en.wikipedia.org/wiki/RC4#Fluhrer.2C_Mantin_and_Shamir_attack */ - for (i = 0; i < 12; i++) rc4_stream_keystream(&prng->rc4.s, buf, sizeof(buf)); - prng->ready = 1; -LBL_UNLOCK: - LTC_MUTEX_UNLOCK(&prng->lock); - return err; -} - -/** - Read from the PRNG - @param out Destination - @param outlen Length of output - @param prng The active PRNG to read from - @return Number of octets read -*/ -unsigned long rc4_read(unsigned char *out, unsigned long outlen, prng_state *prng) -{ - if (outlen == 0 || prng == NULL || out == NULL) return 0; - LTC_MUTEX_LOCK(&prng->lock); - if (!prng->ready) { outlen = 0; goto LBL_UNLOCK; } - if (rc4_stream_keystream(&prng->rc4.s, out, outlen) != CRYPT_OK) outlen = 0; -LBL_UNLOCK: - LTC_MUTEX_UNLOCK(&prng->lock); - return outlen; -} - -/** - Terminate the PRNG - @param prng The PRNG to terminate - @return CRYPT_OK if successful -*/ -int rc4_done(prng_state *prng) -{ - int err; - LTC_ARGCHK(prng != NULL); - LTC_MUTEX_LOCK(&prng->lock); - prng->ready = 0; - err = rc4_stream_done(&prng->rc4.s); - LTC_MUTEX_UNLOCK(&prng->lock); - LTC_MUTEX_DESTROY(&prng->lock); - return err; -} - -/** - Export the PRNG state - @param out [out] Destination - @param outlen [in/out] Max size and resulting size of the state - @param prng The PRNG to export - @return CRYPT_OK if successful -*/ -int rc4_export(unsigned char *out, unsigned long *outlen, prng_state *prng) -{ - unsigned long len = rc4_desc.export_size; - - LTC_ARGCHK(prng != NULL); - LTC_ARGCHK(out != NULL); - LTC_ARGCHK(outlen != NULL); - - if (*outlen < len) { - *outlen = len; - return CRYPT_BUFFER_OVERFLOW; - } - - if (rc4_read(out, len, prng) != len) { - return CRYPT_ERROR_READPRNG; - } - - *outlen = len; - return CRYPT_OK; -} - -/** - Import a PRNG state - @param in The PRNG state - @param inlen Size of the state - @param prng The PRNG to import - @return CRYPT_OK if successful -*/ -int rc4_import(const unsigned char *in, unsigned long inlen, prng_state *prng) -{ - int err; - - LTC_ARGCHK(prng != NULL); - LTC_ARGCHK(in != NULL); - if (inlen < (unsigned long)rc4_desc.export_size) return CRYPT_INVALID_ARG; - - if ((err = rc4_start(prng)) != CRYPT_OK) return err; - if ((err = rc4_add_entropy(in, inlen, prng)) != CRYPT_OK) return err; - return CRYPT_OK; -} - -/** - PRNG self-test - @return CRYPT_OK if successful, CRYPT_NOP if self-testing has been disabled -*/ -int rc4_test(void) -{ -#ifndef LTC_TEST - return CRYPT_NOP; -#else - prng_state st; - unsigned char en[] = { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, - 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, - 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, - 0x1f, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, - 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32 }; - unsigned char dmp[500]; - unsigned long dmplen = sizeof(dmp); - unsigned char out[1000]; - unsigned char t1[] = { 0xE0, 0x4D, 0x9A, 0xF6, 0xA8, 0x9D, 0x77, 0x53, 0xAE, 0x09 }; - unsigned char t2[] = { 0xEF, 0x80, 0xA2, 0xE6, 0x50, 0x91, 0xF3, 0x17, 0x4A, 0x8A }; - unsigned char t3[] = { 0x4B, 0xD6, 0x5C, 0x67, 0x99, 0x03, 0x56, 0x12, 0x80, 0x48 }; - int err; - - if ((err = rc4_start(&st)) != CRYPT_OK) return err; - /* add entropy to uninitialized prng */ - if ((err = rc4_add_entropy(en, sizeof(en), &st)) != CRYPT_OK) return err; - if ((err = rc4_ready(&st)) != CRYPT_OK) return err; - if (rc4_read(out, 10, &st) != 10) return CRYPT_ERROR_READPRNG; /* 10 bytes for testing */ - if (compare_testvector(out, 10, t1, sizeof(t1), "RC4-PRNG", 1)) return CRYPT_FAIL_TESTVECTOR; - if (rc4_read(out, 500, &st) != 500) return CRYPT_ERROR_READPRNG; /* skip 500 bytes */ - /* add entropy to already initialized prng */ - if ((err = rc4_add_entropy(en, sizeof(en), &st)) != CRYPT_OK) return err; - if (rc4_read(out, 500, &st) != 500) return CRYPT_ERROR_READPRNG; /* skip 500 bytes */ - if ((err = rc4_export(dmp, &dmplen, &st)) != CRYPT_OK) return err; - if (rc4_read(out, 500, &st) != 500) return CRYPT_ERROR_READPRNG; /* skip 500 bytes */ - if (rc4_read(out, 10, &st) != 10) return CRYPT_ERROR_READPRNG; /* 10 bytes for testing */ - if (compare_testvector(out, 10, t2, sizeof(t2), "RC4-PRNG", 2)) return CRYPT_FAIL_TESTVECTOR; - if ((err = rc4_done(&st)) != CRYPT_OK) return err; - if ((err = rc4_import(dmp, dmplen, &st)) != CRYPT_OK) return err; - if ((err = rc4_ready(&st)) != CRYPT_OK) return err; - if (rc4_read(out, 500, &st) != 500) return CRYPT_ERROR_READPRNG; /* skip 500 bytes */ - if (rc4_read(out, 10, &st) != 10) return CRYPT_ERROR_READPRNG; /* 10 bytes for testing */ - if (compare_testvector(out, 10, t3, sizeof(t3), "RC4-PRNG", 3)) return CRYPT_FAIL_TESTVECTOR; - if ((err = rc4_done(&st)) != CRYPT_OK) return err; - - return CRYPT_OK; -#endif -} - -#endif - -/* ref: $Format:%D$ */ -/* git commit: $Format:%H$ */ -/* commit time: $Format:%ai$ */