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Diffstat (limited to 'libtomcrypt/src/prngs/yarrow.c')
| -rw-r--r-- | libtomcrypt/src/prngs/yarrow.c | 317 |
1 files changed, 317 insertions, 0 deletions
diff --git a/libtomcrypt/src/prngs/yarrow.c b/libtomcrypt/src/prngs/yarrow.c new file mode 100644 index 0000000..0e59c22 --- /dev/null +++ b/libtomcrypt/src/prngs/yarrow.c @@ -0,0 +1,317 @@ +/* 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. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file yarrow.c + Yarrow PRNG, Tom St Denis +*/ + +#ifdef 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); + + /* these are the default hash/cipher combo used */ +#ifdef RIJNDAEL +#if YARROW_AES==0 + prng->yarrow.cipher = register_cipher(&rijndael_enc_desc); +#elif YARROW_AES==1 + prng->yarrow.cipher = register_cipher(&aes_enc_desc); +#elif YARROW_AES==2 + prng->yarrow.cipher = register_cipher(&rijndael_desc); +#elif YARROW_AES==3 + prng->yarrow.cipher = register_cipher(&aes_desc); +#endif +#elif defined(BLOWFISH) + prng->yarrow.cipher = register_cipher(&blowfish_desc); +#elif defined(TWOFISH) + prng->yarrow.cipher = register_cipher(&twofish_desc); +#elif defined(RC6) + prng->yarrow.cipher = register_cipher(&rc6_desc); +#elif defined(RC5) + prng->yarrow.cipher = register_cipher(&rc5_desc); +#elif defined(SAFERP) + prng->yarrow.cipher = register_cipher(&saferp_desc); +#elif defined(RC2) + prng->yarrow.cipher = register_cipher(&rc2_desc); +#elif defined(NOEKEON) + prng->yarrow.cipher = register_cipher(&noekeon_desc); +#elif defined(CAST5) + prng->yarrow.cipher = register_cipher(&cast5_desc); +#elif defined(XTEA) + prng->yarrow.cipher = register_cipher(&xtea_desc); +#elif defined(SAFER) + prng->yarrow.cipher = register_cipher(&safer_sk128_desc); +#elif defined(DES) + prng->yarrow.cipher = register_cipher(&des3_desc); +#else + #error YARROW needs at least one CIPHER +#endif + if ((err = cipher_is_valid(prng->yarrow.cipher)) != CRYPT_OK) { + return err; + } + +#ifdef SHA256 + prng->yarrow.hash = register_hash(&sha256_desc); +#elif defined(SHA512) + prng->yarrow.hash = register_hash(&sha512_desc); +#elif defined(TIGER) + prng->yarrow.hash = register_hash(&tiger_desc); +#elif defined(SHA1) + prng->yarrow.hash = register_hash(&sha1_desc); +#elif defined(RIPEMD160) + prng->yarrow.hash = register_hash(&rmd160_desc); +#elif defined(RIPEMD128) + prng->yarrow.hash = register_hash(&rmd128_desc); +#elif defined(MD5) + prng->yarrow.hash = register_hash(&md5_desc); +#elif defined(MD4) + prng->yarrow.hash = register_hash(&md4_desc); +#elif defined(MD2) + prng->yarrow.hash = register_hash(&md2_desc); +#elif defined(WHIRLPOOL) + prng->yarrow.hash = register_hash(&whirlpool_desc); +#else + #error 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)); + + 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(in != NULL); + LTC_ARGCHK(prng != NULL); + + if ((err = hash_is_valid(prng->yarrow.hash)) != CRYPT_OK) { + return err; + } + + /* start the hash */ + if ((err = hash_descriptor[prng->yarrow.hash].init(&md)) != CRYPT_OK) { + return err; + } + + /* hash the current pool */ + if ((err = hash_descriptor[prng->yarrow.hash].process(&md, prng->yarrow.pool, + hash_descriptor[prng->yarrow.hash].hashsize)) != CRYPT_OK) { + return err; + } + + /* add the new entropy */ + if ((err = hash_descriptor[prng->yarrow.hash].process(&md, in, inlen)) != CRYPT_OK) { + return err; + } + + /* store result */ + if ((err = hash_descriptor[prng->yarrow.hash].done(&md, prng->yarrow.pool)) != CRYPT_OK) { + return err; + } + + return CRYPT_OK; +} + +/** + 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); + + if ((err = hash_is_valid(prng->yarrow.hash)) != CRYPT_OK) { + return err; + } + + if ((err = cipher_is_valid(prng->yarrow.cipher)) != CRYPT_OK) { + return err; + } + + /* 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) { + return err; + } + + 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) { + return err; + } + 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 yarrow_read(unsigned char *out, unsigned long outlen, prng_state *prng) +{ + LTC_ARGCHK(out != NULL); + LTC_ARGCHK(prng != NULL); + + /* put out in predictable state first */ + zeromem(out, outlen); + + /* now randomize it */ + if (ctr_encrypt(out, out, outlen, &prng->yarrow.ctr) != CRYPT_OK) { + return 0; + } + return outlen; +} + +/** + Terminate the PRNG + @param prng The PRNG to terminate + @return CRYPT_OK if successful +*/ +int yarrow_done(prng_state *prng) +{ + LTC_ARGCHK(prng != NULL); + + /* call cipher done when we invent one ;-) */ + + /* we invented one */ + return ctr_done(&prng->yarrow.ctr); +} + +/** + 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) +{ + LTC_ARGCHK(out != NULL); + LTC_ARGCHK(outlen != NULL); + LTC_ARGCHK(prng != NULL); + + /* we'll write 64 bytes for s&g's */ + if (*outlen < 64) { + return CRYPT_BUFFER_OVERFLOW; + } + + if (yarrow_read(out, 64, prng) != 64) { + return CRYPT_ERROR_READPRNG; + } + *outlen = 64; + + 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 != 64) { + return CRYPT_INVALID_ARG; + } + + if ((err = yarrow_start(prng)) != CRYPT_OK) { + return err; + } + return yarrow_add_entropy(in, 64, prng); +} + +/** + 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 ((err = cipher_descriptor[prng.yarrow.cipher].test()) != CRYPT_OK) { + return err; + } + if ((err = hash_descriptor[prng.yarrow.hash].test()) != CRYPT_OK) { + return err; + } + + yarrow_done(&prng); + return CRYPT_OK; +#endif +} + +#endif + + +/* $Source: /cvs/libtom/libtomcrypt/src/prngs/yarrow.c,v $ */ +/* $Revision: 1.5 $ */ +/* $Date: 2005/05/05 14:35:59 $ */ |