diff options
| -rw-r--r-- | CryptoPkg/Library/TlsLib/TlsConfig.c | 36 |
1 files changed, 23 insertions, 13 deletions
diff --git a/CryptoPkg/Library/TlsLib/TlsConfig.c b/CryptoPkg/Library/TlsLib/TlsConfig.c index 507489386b..c1d91a5994 100644 --- a/CryptoPkg/Library/TlsLib/TlsConfig.c +++ b/CryptoPkg/Library/TlsLib/TlsConfig.c @@ -30,6 +30,8 @@ typedef struct { // The mapping table between IANA/IETF Cipher Suite definitions and
// OpenSSL-used Cipher Suite name.
//
+// Keep the table uniquely sorted by the IanaCipher field, in increasing order.
+//
STATIC CONST TLS_CIPHER_MAPPING TlsCipherMappingTable[] = {
{ 0x0001, "NULL-MD5" }, /// TLS_RSA_WITH_NULL_MD5
{ 0x0002, "NULL-SHA" }, /// TLS_RSA_WITH_NULL_SHA
@@ -71,22 +73,30 @@ TlsGetCipherMapping ( IN UINT16 CipherId
)
{
- CONST TLS_CIPHER_MAPPING *CipherEntry;
- UINTN TableSize;
- UINTN Index;
-
- CipherEntry = TlsCipherMappingTable;
- TableSize = sizeof (TlsCipherMappingTable) / sizeof (TLS_CIPHER_MAPPING);
+ INTN Left;
+ INTN Right;
+ INTN Middle;
//
- // Search Cipher Mapping Table for IANA-OpenSSL Cipher Translation
+ // Binary Search Cipher Mapping Table for IANA-OpenSSL Cipher Translation
//
- for (Index = 0; Index < TableSize; Index++, CipherEntry++) {
- //
- // Translate IANA cipher suite name to OpenSSL name.
- //
- if (CipherEntry->IanaCipher == CipherId) {
- return CipherEntry;
+ Left = 0;
+ Right = ARRAY_SIZE (TlsCipherMappingTable) - 1;
+
+ while (Right >= Left) {
+ Middle = (Left + Right) / 2;
+
+ if (CipherId == TlsCipherMappingTable[Middle].IanaCipher) {
+ //
+ // Translate IANA cipher suite ID to OpenSSL name.
+ //
+ return &TlsCipherMappingTable[Middle];
+ }
+
+ if (CipherId < TlsCipherMappingTable[Middle].IanaCipher) {
+ Right = Middle - 1;
+ } else {
+ Left = Middle + 1;
}
}
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