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