X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=libtomcrypt%2Fsrc%2Fprngs%2Fyarrow.c;fp=libtomcrypt%2Fsrc%2Fprngs%2Fyarrow.c;h=e598834836afd3dc5a1dbda786585d6380c861ff;hb=66bc25938679f1d6a1d1200f329093d82a5e99b4;hp=0000000000000000000000000000000000000000;hpb=a52ee0733f420ca20224049260d6fc5cf7d8f621;p=zpackage diff --git a/libtomcrypt/src/prngs/yarrow.c b/libtomcrypt/src/prngs/yarrow.c new file mode 100644 index 0000000..e598834 --- /dev/null +++ b/libtomcrypt/src/prngs/yarrow.c @@ -0,0 +1,352 @@ +/* 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 yarrow.c + Yarrow PRNG, Tom St Denis +*/ + +#ifdef LTC_YARROW + +const struct ltc_prng_descriptor yarrow_desc = +{ + "yarrow", 64, + &yarrow_start, + &yarrow_add_entropy, + &yarrow_ready, + &yarrow_read, + &yarrow_done, + &yarrow_export, + &yarrow_import, + &yarrow_test +}; + +/** + Start the PRNG + @param prng [out] The PRNG state to initialize + @return CRYPT_OK if successful +*/ +int yarrow_start(prng_state *prng) +{ + int err; + + LTC_ARGCHK(prng != NULL); + prng->ready = 0; + + /* these are the default hash/cipher combo used */ +#ifdef LTC_RIJNDAEL +#if LTC_YARROW_AES==0 + prng->yarrow.cipher = register_cipher(&rijndael_enc_desc); +#elif LTC_YARROW_AES==1 + prng->yarrow.cipher = register_cipher(&aes_enc_desc); +#elif LTC_YARROW_AES==2 + prng->yarrow.cipher = register_cipher(&rijndael_desc); +#elif LTC_YARROW_AES==3 + prng->yarrow.cipher = register_cipher(&aes_desc); +#endif +#elif defined(LTC_BLOWFISH) + prng->yarrow.cipher = register_cipher(&blowfish_desc); +#elif defined(LTC_TWOFISH) + prng->yarrow.cipher = register_cipher(&twofish_desc); +#elif defined(LTC_RC6) + prng->yarrow.cipher = register_cipher(&rc6_desc); +#elif defined(LTC_RC5) + prng->yarrow.cipher = register_cipher(&rc5_desc); +#elif defined(LTC_SAFERP) + prng->yarrow.cipher = register_cipher(&saferp_desc); +#elif defined(LTC_RC2) + prng->yarrow.cipher = register_cipher(&rc2_desc); +#elif defined(LTC_NOEKEON) + prng->yarrow.cipher = register_cipher(&noekeon_desc); +#elif defined(LTC_ANUBIS) + prng->yarrow.cipher = register_cipher(&anubis_desc); +#elif defined(LTC_KSEED) + prng->yarrow.cipher = register_cipher(&kseed_desc); +#elif defined(LTC_KHAZAD) + prng->yarrow.cipher = register_cipher(&khazad_desc); +#elif defined(LTC_CAST5) + prng->yarrow.cipher = register_cipher(&cast5_desc); +#elif defined(LTC_XTEA) + prng->yarrow.cipher = register_cipher(&xtea_desc); +#elif defined(LTC_SAFER) + prng->yarrow.cipher = register_cipher(&safer_sk128_desc); +#elif defined(LTC_DES) + prng->yarrow.cipher = register_cipher(&des3_desc); +#else + #error LTC_YARROW needs at least one CIPHER +#endif + if ((err = cipher_is_valid(prng->yarrow.cipher)) != CRYPT_OK) { + return err; + } + +#ifdef LTC_SHA256 + prng->yarrow.hash = register_hash(&sha256_desc); +#elif defined(LTC_SHA512) + prng->yarrow.hash = register_hash(&sha512_desc); +#elif defined(LTC_TIGER) + prng->yarrow.hash = register_hash(&tiger_desc); +#elif defined(LTC_SHA1) + prng->yarrow.hash = register_hash(&sha1_desc); +#elif defined(LTC_RIPEMD320) + prng->yarrow.hash = register_hash(&rmd320_desc); +#elif defined(LTC_RIPEMD256) + prng->yarrow.hash = register_hash(&rmd256_desc); +#elif defined(LTC_RIPEMD160) + prng->yarrow.hash = register_hash(&rmd160_desc); +#elif defined(LTC_RIPEMD128) + prng->yarrow.hash = register_hash(&rmd128_desc); +#elif defined(LTC_MD5) + prng->yarrow.hash = register_hash(&md5_desc); +#elif defined(LTC_MD4) + prng->yarrow.hash = register_hash(&md4_desc); +#elif defined(LTC_MD2) + prng->yarrow.hash = register_hash(&md2_desc); +#elif defined(LTC_WHIRLPOOL) + prng->yarrow.hash = register_hash(&whirlpool_desc); +#else + #error LTC_YARROW needs at least one HASH +#endif + if ((err = hash_is_valid(prng->yarrow.hash)) != CRYPT_OK) { + return err; + } + + /* zero the memory used */ + zeromem(prng->yarrow.pool, sizeof(prng->yarrow.pool)); + 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 yarrow_add_entropy(const unsigned char *in, unsigned long inlen, prng_state *prng) +{ + hash_state md; + int err; + + LTC_ARGCHK(prng != NULL); + LTC_ARGCHK(in != NULL); + LTC_ARGCHK(inlen > 0); + + LTC_MUTEX_LOCK(&prng->lock); + + if ((err = hash_is_valid(prng->yarrow.hash)) != CRYPT_OK) { + goto LBL_UNLOCK; + } + + /* start the hash */ + if ((err = hash_descriptor[prng->yarrow.hash].init(&md)) != CRYPT_OK) { + goto LBL_UNLOCK; + } + + /* hash the current pool */ + if ((err = hash_descriptor[prng->yarrow.hash].process(&md, prng->yarrow.pool, + hash_descriptor[prng->yarrow.hash].hashsize)) != CRYPT_OK) { + goto LBL_UNLOCK; + } + + /* add the new entropy */ + if ((err = hash_descriptor[prng->yarrow.hash].process(&md, in, inlen)) != CRYPT_OK) { + goto LBL_UNLOCK; + } + + /* store result */ + err = hash_descriptor[prng->yarrow.hash].done(&md, prng->yarrow.pool); + +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 yarrow_ready(prng_state *prng) +{ + int ks, err; + + LTC_ARGCHK(prng != NULL); + + LTC_MUTEX_LOCK(&prng->lock); + + if ((err = hash_is_valid(prng->yarrow.hash)) != CRYPT_OK) { + goto LBL_UNLOCK; + } + + if ((err = cipher_is_valid(prng->yarrow.cipher)) != CRYPT_OK) { + goto LBL_UNLOCK; + } + + /* setup CTR mode using the "pool" as the key */ + ks = (int)hash_descriptor[prng->yarrow.hash].hashsize; + if ((err = cipher_descriptor[prng->yarrow.cipher].keysize(&ks)) != CRYPT_OK) { + goto LBL_UNLOCK; + } + + if ((err = ctr_start(prng->yarrow.cipher, /* what cipher to use */ + prng->yarrow.pool, /* IV */ + prng->yarrow.pool, ks, /* KEY and key size */ + 0, /* number of rounds */ + CTR_COUNTER_LITTLE_ENDIAN, /* little endian counter */ + &prng->yarrow.ctr)) != CRYPT_OK) { + goto LBL_UNLOCK; + } + 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 yarrow_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; + } + + /* put out in predictable state first */ + zeromem(out, outlen); + + /* now randomize it */ + if (ctr_encrypt(out, out, outlen, &prng->yarrow.ctr) != 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 yarrow_done(prng_state *prng) +{ + int err; + LTC_ARGCHK(prng != NULL); + + LTC_MUTEX_LOCK(&prng->lock); + prng->ready = 0; + + /* call cipher done when we invent one ;-) */ + + /* we invented one */ + err = ctr_done(&prng->yarrow.ctr); + + 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 yarrow_export(unsigned char *out, unsigned long *outlen, prng_state *prng) +{ + unsigned long len = yarrow_desc.export_size; + + LTC_ARGCHK(out != NULL); + LTC_ARGCHK(outlen != NULL); + LTC_ARGCHK(prng != NULL); + + if (*outlen < len) { + *outlen = len; + return CRYPT_BUFFER_OVERFLOW; + } + + if (yarrow_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 yarrow_import(const unsigned char *in, unsigned long inlen, prng_state *prng) +{ + int err; + + LTC_ARGCHK(in != NULL); + LTC_ARGCHK(prng != NULL); + if (inlen < (unsigned long)yarrow_desc.export_size) return CRYPT_INVALID_ARG; + + if ((err = yarrow_start(prng)) != CRYPT_OK) return err; + if ((err = yarrow_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 yarrow_test(void) +{ +#ifndef LTC_TEST + return CRYPT_NOP; +#else + int err; + prng_state prng; + + if ((err = yarrow_start(&prng)) != CRYPT_OK) { + return err; + } + + /* now let's test the hash/cipher that was chosen */ + if (cipher_descriptor[prng.yarrow.cipher].test && + ((err = cipher_descriptor[prng.yarrow.cipher].test()) != CRYPT_OK)) { + return err; + } + if (hash_descriptor[prng.yarrow.hash].test && + ((err = hash_descriptor[prng.yarrow.hash].test()) != CRYPT_OK)) { + return err; + } + + return CRYPT_OK; +#endif +} + +#endif + + +/* ref: $Format:%D$ */ +/* git commit: $Format:%H$ */ +/* commit time: $Format:%ai$ */