diff options
Diffstat (limited to 'libtomcrypt/tests/no_prng.c')
| -rw-r--r-- | libtomcrypt/tests/no_prng.c | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/libtomcrypt/tests/no_prng.c b/libtomcrypt/tests/no_prng.c new file mode 100644 index 0000000..9f2bee3 --- /dev/null +++ b/libtomcrypt/tests/no_prng.c @@ -0,0 +1,185 @@ +/* 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 no_prng.c + NO PRNG, Steffen Jaeckel +*/ + +#ifdef LTC_PKCS_1 + +typedef struct +{ + struct ltc_prng_descriptor desc; + char name[64]; + unsigned char entropy[1024]; + unsigned long len; + unsigned long offset; +} no_prng_desc_t; + +/** + Start the PRNG + @param prng [out] The PRNG state to initialize + @return CRYPT_OK if successful +*/ +int no_prng_start(prng_state *prng) +{ + no_prng_desc_t *no_prng = (no_prng_desc_t*) prng; + LTC_ARGCHK(no_prng != NULL); + LTC_ARGCHK(no_prng->name == (char*)no_prng + offsetof(no_prng_desc_t, name)); + no_prng->len = 0; + no_prng->offset = 0; + + 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 no_prng_add_entropy(const unsigned char *in, unsigned long inlen, prng_state *prng) +{ + no_prng_desc_t *no_prng = (no_prng_desc_t*) prng; + LTC_ARGCHK(no_prng != NULL); + LTC_ARGCHK(no_prng->name == (char*)no_prng + offsetof(no_prng_desc_t, name)); + LTC_ARGCHK(in != NULL); + LTC_ARGCHK(inlen <= sizeof(no_prng->entropy)); + + no_prng->len = MIN(inlen, sizeof(no_prng->entropy)); + memcpy(no_prng->entropy, in, no_prng->len); + no_prng->offset = 0; + + return CRYPT_OK; + +} + +/** + Make the PRNG ready to read from + @param prng The PRNG to make active + @return CRYPT_OK if successful +*/ +int no_prng_ready(prng_state *prng) +{ + LTC_ARGCHK(prng != NULL); + + return CRYPT_OK; +} + +/** + 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 no_prng_read(unsigned char *out, unsigned long outlen, prng_state *prng) +{ + no_prng_desc_t *no_prng = (no_prng_desc_t*) prng; + LTC_ARGCHK(no_prng != NULL); + LTC_ARGCHK(no_prng->name == (char*)no_prng + offsetof(no_prng_desc_t, name)); + LTC_ARGCHK(out != NULL); + + outlen = MIN(outlen, no_prng->len - no_prng->offset); + memcpy(out, &no_prng->entropy[no_prng->offset], outlen); + no_prng->offset += outlen; + + return outlen; +} + +/** + Terminate the PRNG + @param prng The PRNG to terminate + @return CRYPT_OK if successful +*/ +int no_prng_done(prng_state *prng) +{ + LTC_UNUSED_PARAM(prng); + return CRYPT_OK; +} + +/** + 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 no_prng_export(unsigned char *out, unsigned long *outlen, prng_state *prng) +{ + LTC_UNUSED_PARAM(out); + LTC_UNUSED_PARAM(outlen); + LTC_UNUSED_PARAM(prng); + 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 no_prng_import(const unsigned char *in, unsigned long inlen, prng_state *prng) +{ + LTC_UNUSED_PARAM(in); + LTC_UNUSED_PARAM(inlen); + LTC_UNUSED_PARAM(prng); + return CRYPT_OK; +} + +/** + PRNG self-test + @return CRYPT_OK if successful, CRYPT_NOP if self-testing has been disabled +*/ +int no_prng_test(void) +{ + return CRYPT_OK; +} + +static const struct ltc_prng_descriptor no_prng_desc = +{ + NULL, 0, + &no_prng_start, + &no_prng_add_entropy, + &no_prng_ready, + &no_prng_read, + &no_prng_done, + &no_prng_export, + &no_prng_import, + &no_prng_test +}; + +struct ltc_prng_descriptor* no_prng_desc_get(void) +{ + no_prng_desc_t* no_prng = XMALLOC(sizeof(*no_prng)); + LTC_ARGCHK(no_prng != NULL); + XMEMCPY(&no_prng->desc, &no_prng_desc, sizeof(no_prng_desc)); + LTC_ARGCHK(snprintf(no_prng->name, sizeof(no_prng->name), "no_prng@%p", no_prng) < (int)sizeof(no_prng->name)); + no_prng->desc.name = no_prng->name; + return &no_prng->desc; +} + +void no_prng_desc_free(struct ltc_prng_descriptor* prng) +{ + no_prng_desc_t *no_prng = (no_prng_desc_t*) prng; + LTC_ARGCHK(no_prng != NULL); + LTC_ARGCHK(no_prng->name == (char*)no_prng + offsetof(no_prng_desc_t, name)); + XFREE(no_prng); +} + +#endif + + +/* ref: $Format:%D$ */ +/* git commit: $Format:%H$ */ +/* commit time: $Format:%ai$ */ |