Move SHA256-based PRF function into a separate C file

[mech_eap.git] / src / crypto / sha256.c

diff --git a/src/crypto/sha256.c b/src/crypto/sha256.c
index 5c09ed1..493acda 100644 (file)
--- a/src/crypto/sha256.c
+++ b/src/crypto/sha256.c
@@ -98,54 +98,3 @@ void hmac_sha256(const u8 *key, size_t key_len, const u8 *data,
 {
        hmac_sha256_vector(key, key_len, 1, &data, &data_len, mac);
 }
-
-
-/**
- * sha256_prf - SHA256-based Pseudo-Random Function (IEEE 802.11r, 8.5.1.5.2)
- * @key: Key for PRF
- * @key_len: Length of the key in bytes
- * @label: A unique label for each purpose of the PRF
- * @data: Extra data to bind into the key
- * @data_len: Length of the data
- * @buf: Buffer for the generated pseudo-random key
- * @buf_len: Number of bytes of key to generate
- *
- * This function is used to derive new, cryptographically separate keys from a
- * given key.
- */
-void sha256_prf(const u8 *key, size_t key_len, const char *label,
-               const u8 *data, size_t data_len, u8 *buf, size_t buf_len)
-{
-       u16 counter = 1;
-       size_t pos, plen;
-       u8 hash[SHA256_MAC_LEN];
-       const u8 *addr[4];
-       size_t len[4];
-       u8 counter_le[2], length_le[2];
-
-       addr[0] = counter_le;
-       len[0] = 2;
-       addr[1] = (u8 *) label;
-       len[1] = os_strlen(label);
-       addr[2] = data;
-       len[2] = data_len;
-       addr[3] = length_le;
-       len[3] = sizeof(length_le);
-
-       WPA_PUT_LE16(length_le, buf_len * 8);
-       pos = 0;
-       while (pos < buf_len) {
-               plen = buf_len - pos;
-               WPA_PUT_LE16(counter_le, counter);
-               if (plen >= SHA256_MAC_LEN) {
-                       hmac_sha256_vector(key, key_len, 4, addr, len,
-                                          &buf[pos]);
-                       pos += SHA256_MAC_LEN;
-               } else {
-                       hmac_sha256_vector(key, key_len, 4, addr, len, hash);
-                       os_memcpy(&buf[pos], hash, plen);
-                       break;
-               }
-               counter++;
-       }
-}