57 lines
1.3 KiB
C
57 lines
1.3 KiB
C
|
#include "sun4i-ss.h"
|
||
|
|
|
||
|
|
int sun4i_ss_prng_seed(struct crypto_rng *tfm, const u8 *seed,
|
||
|
|
unsigned int slen)
|
||
|
|
{
|
||
|
|
struct sun4i_ss_alg_template *algt;
|
||
|
|
struct rng_alg *alg = crypto_rng_alg(tfm);
|
||
|
|
|
||
|
|
algt = container_of(alg, struct sun4i_ss_alg_template, alg.rng);
|
||
|
|
memcpy(algt->ss->seed, seed, slen);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int sun4i_ss_prng_generate(struct crypto_rng *tfm, const u8 *src,
|
||
|
|
unsigned int slen, u8 *dst, unsigned int dlen)
|
||
|
|
{
|
||
|
|
struct sun4i_ss_alg_template *algt;
|
||
|
|
struct rng_alg *alg = crypto_rng_alg(tfm);
|
||
|
|
int i;
|
||
|
|
u32 v;
|
||
|
|
u32 *data = (u32 *)dst;
|
||
|
|
const u32 mode = SS_OP_PRNG | SS_PRNG_CONTINUE | SS_ENABLED;
|
||
|
|
size_t len;
|
||
|
|
struct sun4i_ss_ctx *ss;
|
||
|
|
unsigned int todo = (dlen / 4) * 4;
|
||
|
|
|
||
|
|
algt = container_of(alg, struct sun4i_ss_alg_template, alg.rng);
|
||
|
|
ss = algt->ss;
|
||
|
|
|
||
|
|
spin_lock_bh(&ss->slock);
|
||
|
|
|
||
|
|
writel(mode, ss->base + SS_CTL);
|
||
|
|
|
||
|
|
while (todo > 0) {
|
||
|
|
/* write the seed */
|
||
|
|
for (i = 0; i < SS_SEED_LEN / BITS_PER_LONG; i++)
|
||
|
|
writel(ss->seed[i], ss->base + SS_KEY0 + i * 4);
|
||
|
|
|
||
|
|
/* Read the random data */
|
||
|
|
len = min_t(size_t, SS_DATA_LEN / BITS_PER_BYTE, todo);
|
||
|
|
readsl(ss->base + SS_TXFIFO, data, len / 4);
|
||
|
|
data += len / 4;
|
||
|
|
todo -= len;
|
||
|
|
|
||
|
|
/* Update the seed */
|
||
|
|
for (i = 0; i < SS_SEED_LEN / BITS_PER_LONG; i++) {
|
||
|
|
v = readl(ss->base + SS_KEY0 + i * 4);
|
||
|
|
ss->seed[i] = v;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
writel(0, ss->base + SS_CTL);
|
||
|
|
spin_unlock_bh(&ss->slock);
|
||
|
|
return 0;
|
||
|
|
}
|