--- /dev/null
+/* 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/sober128.c
+ Implementation of SOBER-128 by Tom St Denis.
+ Based on s128fast.c reference code supplied by Greg Rose of QUALCOMM.
+*/
+
+#ifdef LTC_SOBER128
+
+const struct ltc_prng_descriptor sober128_desc =
+{
+ "sober128",
+ 40,
+ &sober128_start,
+ &sober128_add_entropy,
+ &sober128_ready,
+ &sober128_read,
+ &sober128_done,
+ &sober128_export,
+ &sober128_import,
+ &sober128_test
+};
+
+/**
+ Start the PRNG
+ @param prng [out] The PRNG state to initialize
+ @return CRYPT_OK if successful
+*/
+int sober128_start(prng_state *prng)
+{
+ LTC_ARGCHK(prng != NULL);
+ prng->ready = 0;
+ XMEMSET(&prng->sober128.ent, 0, sizeof(prng->sober128.ent));
+ prng->sober128.idx = 0;
+ 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 sober128_add_entropy(const unsigned char *in, unsigned long inlen, prng_state *prng)
+{
+ unsigned char buf[40];
+ 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) {
+ /* sober128_ready() was already called, do "rekey" operation */
+ if ((err = sober128_stream_keystream(&prng->sober128.s, buf, sizeof(buf))) != CRYPT_OK) goto LBL_UNLOCK;
+ for(i = 0; i < inlen; i++) buf[i % sizeof(buf)] ^= in[i];
+ /* key 32 bytes, 20 rounds */
+ if ((err = sober128_stream_setup(&prng->sober128.s, buf, 32)) != CRYPT_OK) goto LBL_UNLOCK;
+ /* iv 8 bytes */
+ if ((err = sober128_stream_setiv(&prng->sober128.s, buf + 32, 8)) != CRYPT_OK) goto LBL_UNLOCK;
+ /* clear KEY + IV */
+ zeromem(buf, sizeof(buf));
+ }
+ else {
+ /* sober128_ready() was not called yet, add entropy to ent buffer */
+ while (inlen--) prng->sober128.ent[prng->sober128.idx++ % sizeof(prng->sober128.ent)] ^= *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 sober128_ready(prng_state *prng)
+{
+ int err;
+
+ LTC_ARGCHK(prng != NULL);
+
+ LTC_MUTEX_LOCK(&prng->lock);
+ if (prng->ready) { err = CRYPT_OK; goto LBL_UNLOCK; }
+ /* key 32 bytes, 20 rounds */
+ if ((err = sober128_stream_setup(&prng->sober128.s, prng->sober128.ent, 32)) != CRYPT_OK) goto LBL_UNLOCK;
+ /* iv 8 bytes */
+ if ((err = sober128_stream_setiv(&prng->sober128.s, prng->sober128.ent + 32, 8)) != CRYPT_OK) goto LBL_UNLOCK;
+ XMEMSET(&prng->sober128.ent, 0, sizeof(prng->sober128.ent));
+ prng->sober128.idx = 0;
+ 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 sober128_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 (sober128_stream_keystream(&prng->sober128.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 sober128_done(prng_state *prng)
+{
+ int err;
+ LTC_ARGCHK(prng != NULL);
+ LTC_MUTEX_LOCK(&prng->lock);
+ prng->ready = 0;
+ err = sober128_stream_done(&prng->sober128.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 sober128_export(unsigned char *out, unsigned long *outlen, prng_state *prng)
+{
+ unsigned long len = sober128_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 (sober128_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 sober128_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)sober128_desc.export_size) return CRYPT_INVALID_ARG;
+
+ if ((err = sober128_start(prng)) != CRYPT_OK) return err;
+ if ((err = sober128_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 sober128_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[300];
+ unsigned long dmplen = sizeof(dmp);
+ unsigned char out[500];
+ unsigned char t1[] = { 0x31, 0x82, 0xA7, 0xA5, 0x8B, 0xD7, 0xCB, 0x39, 0x86, 0x1A };
+ unsigned char t2[] = { 0x6B, 0x43, 0x9E, 0xBC, 0xE7, 0x62, 0x9B, 0xE6, 0x9B, 0x83 };
+ unsigned char t3[] = { 0x4A, 0x0E, 0x6C, 0xC1, 0xCF, 0xB4, 0x73, 0x49, 0x99, 0x05 };
+ int err;
+
+ if ((err = sober128_start(&st)) != CRYPT_OK) return err;
+ /* add entropy to uninitialized prng */
+ if ((err = sober128_add_entropy(en, sizeof(en), &st)) != CRYPT_OK) return err;
+ if ((err = sober128_ready(&st)) != CRYPT_OK) return err;
+ if (sober128_read(out, 10, &st) != 10) return CRYPT_ERROR_READPRNG; /* 10 bytes for testing */
+ if (compare_testvector(out, 10, t1, sizeof(t1), "SOBER128-PRNG", 1)) return CRYPT_FAIL_TESTVECTOR;
+ if (sober128_read(out, 500, &st) != 500) return CRYPT_ERROR_READPRNG; /* skip 500 bytes */
+ /* add entropy to already initialized prng */
+ if ((err = sober128_add_entropy(en, sizeof(en), &st)) != CRYPT_OK) return err;
+ if (sober128_read(out, 500, &st) != 500) return CRYPT_ERROR_READPRNG; /* skip 500 bytes */
+ if ((err = sober128_export(dmp, &dmplen, &st)) != CRYPT_OK) return err;
+ if (sober128_read(out, 500, &st) != 500) return CRYPT_ERROR_READPRNG; /* skip 500 bytes */
+ if (sober128_read(out, 10, &st) != 10) return CRYPT_ERROR_READPRNG; /* 10 bytes for testing */
+ if (compare_testvector(out, 10, t2, sizeof(t2), "SOBER128-PRNG", 2)) return CRYPT_FAIL_TESTVECTOR;
+ if ((err = sober128_done(&st)) != CRYPT_OK) return err;
+ if ((err = sober128_import(dmp, dmplen, &st)) != CRYPT_OK) return err;
+ if ((err = sober128_ready(&st)) != CRYPT_OK) return err;
+ if (sober128_read(out, 500, &st) != 500) return CRYPT_ERROR_READPRNG; /* skip 500 bytes */
+ if (sober128_read(out, 10, &st) != 10) return CRYPT_ERROR_READPRNG; /* 10 bytes for testing */
+ if (compare_testvector(out, 10, t3, sizeof(t3), "SOBER128-PRNG", 3)) return CRYPT_FAIL_TESTVECTOR;
+ if ((err = sober128_done(&st)) != CRYPT_OK) return err;
+
+ return CRYPT_OK;
+#endif
+}
+
+#endif
+
+/* ref: $Format:%D$ */
+/* git commit: $Format:%H$ */
+/* commit time: $Format:%ai$ */
projects / zpackage / blobdiff