diff options
| -rw-r--r-- | crypto/rand/drbg_ctr.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/crypto/rand/drbg_ctr.c b/crypto/rand/drbg_ctr.c index 050ae49652..33e1b324c6 100644 --- a/crypto/rand/drbg_ctr.c +++ b/crypto/rand/drbg_ctr.c @@ -366,9 +366,11 @@ __owur static int drbg_ctr_generate(RAND_DRBG *drbg, ctr32 = GETU32(ctr->V + 12) + blocks; if (ctr32 < blocks) { /* 32-bit counter overflow into V. */ - blocks -= ctr32; - buflen = blocks * 16; - ctr32 = 0; + if (ctr32 != 0) { + blocks -= ctr32; + buflen = blocks * 16; + ctr32 = 0; + } ctr96_inc(ctr->V); } PUTU32(ctr->V + 12, ctr32); |