diff options
Diffstat (limited to 'lib/random.c')
| -rw-r--r-- | lib/random.c | 29 |
1 files changed, 14 insertions, 15 deletions
diff --git a/lib/random.c b/lib/random.c index fb3580f9c0..e83935d0e1 100644 --- a/lib/random.c +++ b/lib/random.c @@ -34,17 +34,8 @@ void get_random_bytes(void *_buf, int len) *buf++ = rand() % 256; } -/** - * get_crypto_bytes - get random numbers suitable for cryptographic needs. - */ -static int _get_crypto_bytes(void *buf, int len) +int hwrng_get_crypto_bytes(struct hwrng *rng, void *buf, int len) { - struct hwrng *rng; - - rng = hwrng_get_first(); - if (IS_ERR(rng)) - return PTR_ERR(rng); - while (len) { int bytes = hwrng_get_data(rng, buf, len, true); if (!bytes) @@ -60,20 +51,28 @@ static int _get_crypto_bytes(void *buf, int len) return 0; } +/** + * get_crypto_bytes - get random numbers suitable for cryptographic needs. + */ int get_crypto_bytes(void *buf, int len) { + struct hwrng *rng; int err; - err = _get_crypto_bytes(buf, len); - if (!err) - return 0; + rng = hwrng_get_first(); + err = PTR_ERR_OR_ZERO(rng); + if (!err) { + err = hwrng_get_crypto_bytes(rng, buf, len); + if (!err) + return 0; + } if (!IS_ENABLED(CONFIG_ALLOW_PRNG_FALLBACK)) { - pr_err("error: no HWRNG available!\n"); + pr_err("no HWRNG available!\n"); return err; } - pr_warn("warning: falling back to Pseudo RNG source!\n"); + pr_warn("falling back to Pseudo RNG source!\n"); get_random_bytes(buf, len); |