147 lines
3.7 KiB
C
147 lines
3.7 KiB
C
#include "mycrypt.h"
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#ifdef YARROW
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const struct _prng_descriptor yarrow_desc =
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{
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"yarrow",
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&yarrow_start,
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&yarrow_add_entropy,
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&yarrow_ready,
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&yarrow_read
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};
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int yarrow_start(prng_state *prng)
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{
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int err;
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_ARGCHK(prng != NULL);
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/* these are the default hash/cipher combo used */
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#ifdef RIJNDAEL
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prng->yarrow.cipher = register_cipher(&rijndael_desc);
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#elif defined(NOEKEON)
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prng->yarrow.cipher = register_cipher(&noekeon_desc);
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#elif defined(BLOWFISH)
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prng->yarrow.cipher = register_cipher(&blowfish_desc);
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#elif defined(TWOFISH)
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prng->yarrow.cipher = register_cipher(&twofish_desc);
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#elif defined(CAST5)
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prng->yarrow.cipher = register_cipher(&cast5_desc);
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#elif defined(SERPENT)
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prng->yarrow.cipher = register_cipher(&serpent_desc);
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#elif defined(SAFER)
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prng->yarrow.cipher = register_cipher(&saferp_desc);
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#elif defined(RC5)
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prng->yarrow.cipher = register_cipher(&rc5_desc);
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#elif defined(RC6)
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prng->yarrow.cipher = register_cipher(&rc6_desc);
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#elif defined(XTEA)
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prng->yarrow.cipher = register_cipher(&xtea_desc);
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#elif defined(RC2)
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prng->yarrow.cipher = register_cipher(&rc2_desc);
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#elif defined(DES)
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prng->yarrow.cipher = register_cipher(&des3_desc);
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#elif
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#error YARROW needs at least one CIPHER
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#endif
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if ((err = cipher_is_valid(prng->yarrow.cipher)) != CRYPT_OK) {
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return err;
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}
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#ifdef SHA256
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prng->yarrow.hash = register_hash(&sha256_desc);
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#elif defined(SHA512)
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prng->yarrow.hash = register_hash(&sha512_desc);
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#elif defined(SHA384)
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prng->yarrow.hash = register_hash(&sha384_desc);
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#elif defined(SHA1)
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prng->yarrow.hash = register_hash(&sha1_desc);
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#elif defined(TIGER)
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prng->yarrow.hash = register_hash(&tiger_desc);
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#elif defined(MD5)
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prng->yarrow.hash = register_hash(&md5_desc);
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#elif defined(MD4)
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prng->yarrow.hash = register_hash(&md4_desc);
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#elif defined(MD2)
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prng->yarrow.hash = register_hash(&md2_desc);
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#else
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#error YARROW needs at least one HASH
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#endif
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if ((err = hash_is_valid(prng->yarrow.hash)) != CRYPT_OK) {
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return err;
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}
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/* zero the memory used */
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zeromem(prng->yarrow.pool, sizeof(prng->yarrow.pool));
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return CRYPT_OK;
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}
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int yarrow_add_entropy(const unsigned char *buf, unsigned long len, prng_state *prng)
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{
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hash_state md;
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int err;
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_ARGCHK(buf != NULL);
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_ARGCHK(prng != NULL);
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if ((err = hash_is_valid(prng->yarrow.hash)) != CRYPT_OK) {
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return err;
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}
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/* start the hash */
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hash_descriptor[prng->yarrow.hash].init(&md);
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/* hash the current pool */
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hash_descriptor[prng->yarrow.hash].process(&md, prng->yarrow.pool, hash_descriptor[prng->yarrow.hash].hashsize);
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/* add the new entropy */
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hash_descriptor[prng->yarrow.hash].process(&md, buf, len);
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/* store result */
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hash_descriptor[prng->yarrow.hash].done(&md, prng->yarrow.pool);
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return CRYPT_OK;
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}
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int yarrow_ready(prng_state *prng)
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{
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int ks, err;
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_ARGCHK(prng != NULL);
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if ((err = hash_is_valid(prng->yarrow.hash)) != CRYPT_OK) {
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return err;
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}
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if ((err = cipher_is_valid(prng->yarrow.cipher)) != CRYPT_OK) {
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return err;
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}
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/* setup CTR mode using the "pool" as the key */
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ks = (int)hash_descriptor[prng->yarrow.hash].hashsize;
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if ((err = cipher_descriptor[prng->yarrow.cipher].keysize(&ks)) != CRYPT_OK) {
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return err;
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}
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if ((err = ctr_start(prng->yarrow.cipher, prng->yarrow.pool, prng->yarrow.pool, ks, 0, &prng->yarrow.ctr)) != CRYPT_OK) {
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return err;
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}
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return CRYPT_OK;
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}
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unsigned long yarrow_read(unsigned char *buf, unsigned long len, prng_state *prng)
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{
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_ARGCHK(buf != NULL);
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_ARGCHK(prng != NULL);
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if (ctr_encrypt(buf, buf, len, &prng->yarrow.ctr) != CRYPT_OK) {
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return 0;
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}
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return len;
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}
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#endif
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