Fix the PRF function when compiling without OpenSSL.

diff --git a/src/nolegacy/prf.c b/src/nolegacy/prf.c
index 3c4c27e..55c9923 100644 (file)
--- a/src/nolegacy/prf.c
+++ b/src/nolegacy/prf.c
@@ -28,36 +28,38 @@ static void memxor(char *buf, char c, size_t len) {
 }
 
 static const size_t mdlen = 64;
+static const size_t blklen = 128;
 
 static bool hmac_sha512(const char *key, size_t keylen, const char *msg, size_t msglen, char *out) {
-       char tmp[2 * mdlen];
+       char tmp[blklen + mdlen];
        sha512_context md;
 
-       if(keylen <= mdlen) {
+       if(keylen <= blklen) {
                memcpy(tmp, key, keylen);
-               memset(tmp + keylen, 0, mdlen - keylen);
+               memset(tmp + keylen, 0, blklen - keylen);
        } else {
                if(sha512(key, keylen, tmp) != 0)
                        return false;
+               memset(tmp + mdlen, 0, blklen - mdlen);
        }
 
        if(sha512_init(&md) != 0)
                return false;
 
        // ipad
-       memxor(tmp, 0x36, mdlen);
-       if(sha512_update(&md, tmp, mdlen) != 0)
+       memxor(tmp, 0x36, blklen);
+       if(sha512_update(&md, tmp, blklen) != 0)
                return false;
 
        // message
        if(sha512_update(&md, msg, msglen) != 0)
                return false;
 
-       if(sha512_final(&md, tmp + mdlen) != 0)
+       if(sha512_final(&md, tmp + blklen) != 0)
                return false;
 
        // opad
-       memxor(tmp, 0x36 ^ 0x5c, mdlen);
+       memxor(tmp, 0x36 ^ 0x5c, blklen);
        if(sha512(tmp, sizeof tmp, out) != 0)
                return false;
 
@@ -82,17 +84,17 @@ bool prf(const char *secret, size_t secretlen, char *seed, size_t seedlen, char
 
        while(outlen > 0) {
                /* Inner HMAC */
-               if(!hmac_sha512(data, sizeof data, secret, secretlen, data))
+               if(!hmac_sha512(secret, secretlen, data, sizeof data, data))
                        return false;
 
                /* Outer HMAC */
                if(outlen >= mdlen) {
-                       if(!hmac_sha512(data, sizeof data, secret, secretlen, out))
+                       if(!hmac_sha512(secret, secretlen, data, sizeof data, out))
                                return false;
                        out += mdlen;
                        outlen -= mdlen;
                } else {
-                       if(!hmac_sha512(data, sizeof data, secret, secretlen, hash))
+                       if(!hmac_sha512(secret, secretlen, data, sizeof data, hash))
                                return false;
                        memcpy(out, hash, outlen);
                        out += outlen;