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CryptoPkg/TlsLib: use binary search in the TlsGetCipherMapping() function

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Improve the performance of the TlsGetCipherMapping() function by adopting
the binary search from DhcpFindOptionFormat()
[MdeModulePkg/Universal/Network/Dhcp4Dxe/Dhcp4Option.c].

Cc: Jiaxin Wu <jiaxin.wu@intel.com>
Cc: Qin Long <qin.long@intel.com>
Cc: Siyuan Fu <siyuan.fu@intel.com>
Cc: Ting Ye <ting.ye@intel.com>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=915
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Long Qin <qin.long@intel.com>
Reviewed-by: Jiaxin Wu <jiaxin.wu@intel.com>
This commit is contained in:
Laszlo Ersek 2018-03-31 17:06:39 +02:00
parent ecfd37ba1b
commit 5eadb54e26
1 changed files with 23 additions and 13 deletions
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32
CryptoPkg/Library/TlsLib/TlsConfig.c
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@ -30,6 +30,8 @@ typedef struct {
// The mapping table between IANA/IETF Cipher Suite definitions and // The mapping table between IANA/IETF Cipher Suite definitions and
// OpenSSL-used Cipher Suite name. // OpenSSL-used Cipher Suite name.
// //
// Keep the table uniquely sorted by the IanaCipher field, in increasing order.
//
STATIC CONST TLS_CIPHER_MAPPING TlsCipherMappingTable[] = { STATIC CONST TLS_CIPHER_MAPPING TlsCipherMappingTable[] = {
{ 0x0001, "NULL-MD5" }, /// TLS_RSA_WITH_NULL_MD5 { 0x0001, "NULL-MD5" }, /// TLS_RSA_WITH_NULL_MD5
{ 0x0002, "NULL-SHA" }, /// TLS_RSA_WITH_NULL_SHA { 0x0002, "NULL-SHA" }, /// TLS_RSA_WITH_NULL_SHA
@ -71,22 +73,30 @@ TlsGetCipherMapping (
IN UINT16 CipherId IN UINT16 CipherId
) )
{ {
CONST TLS_CIPHER_MAPPING *CipherEntry; INTN Left;
UINTN TableSize; INTN Right;
UINTN Index; INTN Middle;
CipherEntry = TlsCipherMappingTable;
TableSize = sizeof (TlsCipherMappingTable) / sizeof (TLS_CIPHER_MAPPING);
// //
// 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++) { Left = 0;
Right = ARRAY_SIZE (TlsCipherMappingTable) - 1;
while (Right >= Left) {
Middle = (Left + Right) / 2;
if (CipherId == TlsCipherMappingTable[Middle].IanaCipher) {
// //
// Translate IANA cipher suite name to OpenSSL name. // Translate IANA cipher suite ID to OpenSSL name.
// //
if (CipherEntry->IanaCipher == CipherId) { return &TlsCipherMappingTable[Middle];
return CipherEntry; }
if (CipherId < TlsCipherMappingTable[Middle].IanaCipher) {
Right = Middle - 1;
} else {
Left = Middle + 1;
} }
} }