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Add random number generation capability to the cswift engine.

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Should this be added to 0.9.6-stable as well?
PR: 275
This commit is contained in:
Richard Levitte 2002-10-04 13:30:57 +00:00
parent e984b2af64
commit 0638ced5cc
1 changed files with 71 additions and 1 deletions
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72
crypto/engine/hw_cswift.c
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@ -121,6 +121,10 @@ static int cswift_mod_exp_dh(const DH *dh, BIGNUM *r,
const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx);
#endif
/* RAND stuff */
static int cswift_rand_bytes(unsigned char *buf, int num);
static int cswift_rand_status(void);
/* The definitions for control commands specific to this engine */
#define CSWIFT_CMD_SO_PATH ENGINE_CMD_BASE
static const ENGINE_CMD_DEFN cswift_cmd_defns[] = {
@ -183,6 +187,18 @@ static DH_METHOD cswift_dh =
};
#endif
static RAND_METHOD cswift_random =
{
/* "CryptoSwift RAND method", */
NULL,
cswift_rand_bytes,
NULL,
NULL,
cswift_rand_bytes,
cswift_rand_status,
};
/* Constants used when creating the ENGINE */
static const char *engine_cswift_id = "cswift";
static const char *engine_cswift_name = "CryptoSwift hardware engine support";
@ -208,7 +224,7 @@ static int bind_helper(ENGINE *e)
#ifndef OPENSSL_NO_DH
!ENGINE_set_DH(e, &cswift_dh) ||
#endif
!ENGINE_set_destroy_function(e, cswift_destroy) ||
!ENGINE_set_RAND(e, &cswift_random) ||
!ENGINE_set_init_function(e, cswift_init) ||
!ENGINE_set_finish_function(e, cswift_finish) ||
!ENGINE_set_ctrl_function(e, cswift_ctrl) ||
@ -905,6 +921,60 @@ static int cswift_mod_exp_dh(const DH *dh, BIGNUM *r,
}
#endif
/* Random bytes are good */
static int cswift_rand_bytes(unsigned char *buf, int num)
{
SW_CONTEXT_HANDLE hac;
SW_STATUS swrc;
SW_LARGENUMBER largenum;
size_t nbytes = 0;
int acquired = 0;
int to_return = 0; /* assume failure */
if (!get_context(&hac))
{
CSWIFTerr(CSWIFT_F_CSWIFT_CTRL, CSWIFT_R_UNIT_FAILURE);
goto err;
}
acquired = 1;
while (nbytes < num)
{
/* tell CryptoSwift how many bytes we want and where we want it.
* Note: - CryptoSwift cannot do more than 4096 bytes at a time.
* - CryptoSwift can only do multiple of 32-bits. */
largenum.value = (SW_BYTE *) buf + nbytes;
if (4096 > num - nbytes)
largenum.nbytes = num - nbytes;
else
largenum.nbytes = 4096;
swrc = p_CSwift_SimpleRequest(hac, SW_CMD_RAND, NULL, 0, &largenum, 1);
if (swrc != SW_OK)
{
char tmpbuf[20];
CSWIFTerr(CSWIFT_F_CSWIFT_CTRL, CSWIFT_R_REQUEST_FAILED);
sprintf(tmpbuf, "%ld", swrc);
ERR_add_error_data(2, "CryptoSwift error number is ", tmpbuf);
goto err;
}
nbytes += largenum.nbytes;
}
to_return = 1; /* success */
err:
if (acquired)
release_context(hac);
return to_return;
}
static int cswift_rand_status(void)
{
return 1;
}
/* This stuff is needed if this ENGINE is being compiled into a self-contained
* shared-library. */
#ifdef ENGINE_DYNAMIC_SUPPORT