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OpenSSL: Use internal keying material exporter when possible

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Use SSL_export_keying_material() if possible, i.e., if OpenSSL is
version 1.0.1 or newer and if client random value is used first. This
allows MSK derivation with TLS-based EAP methods (apart from EAP-FAST)
without exporting the master key from OpenSSL.

Signed-hostap: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2012-08-16 19:29:34 +03:00
parent 371296881a
commit 68770ccd6e
1 changed files with 13 additions and 0 deletions
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13
src/crypto/tls_openssl.c
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@ -2323,6 +2323,19 @@ int tls_connection_prf(void *tls_ctx, struct tls_connection *conn,
const char *label, int server_random_first,
u8 *out, size_t out_len)
{
#if OPENSSL_VERSION_NUMBER >= 0x10001000L
SSL *ssl;
if (conn == NULL)
return -1;
if (server_random_first)
return -1;
ssl = conn->ssl;
if (SSL_export_keying_material(ssl, out, out_len, label,
os_strlen(label), NULL, 0, 0) == 1) {
wpa_printf(MSG_DEBUG, "OpenSSL: Using internal PRF");
return 0;
}
#endif
return -1;
}