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core: Fix output buffer length handling of prf_sha1() function

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This commit is contained in:
Marcel Holtmann 2014-12-28 06:49:00 +01:00
parent 8b3ec52c09
commit f25b1442ff
1 changed files with 10 additions and 3 deletions
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13
src/sha1.c
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@ -174,10 +174,17 @@ bool prf_sha1(const void *key, size_t key_len,
input_len = prefix_len + 1 + data_len + 1;
for (i = 0; i < (size + 19) / 20; i++) {
__hmac_sha1(checksum, key, key_len, input, input_len,
output + offset, SHA1_MAC_LEN);
size_t len;
offset += 20;
if (size - offset > SHA1_MAC_LEN)
len = SHA1_MAC_LEN;
else
len = size - offset;
__hmac_sha1(checksum, key, key_len, input, input_len,
output + offset, len);
offset += len;
input[input_len - 1]++;
}