Round up the size of the secret parts after splitting it in two.

diff --git a/src/openssl/prf.c b/src/openssl/prf.c
index 59e8a3a..df7f445 100644 (file)
--- a/src/openssl/prf.c
+++ b/src/openssl/prf.c
@@ -71,6 +71,6 @@ bool prf(char *secret, size_t secretlen, char *seed, size_t seedlen, char *out,
 
        memset(out, 0, outlen);
 
-       return prf_xor(NID_sha512, secret, secretlen / 2, seed, seedlen, out, outlen)
-               && prf_xor(NID_whirlpool, secret, secretlen / 2, seed, seedlen, out, outlen);
+       return prf_xor(NID_sha512, secret, (secretlen + 1) / 2, seed, seedlen, out, outlen)
+               && prf_xor(NID_whirlpool, secret + secretlen / 2, (secretlen + 1) / 2, seed, seedlen, out, outlen);
 }