Security-55471.tar.gz

[apple/security.git] / sec / Security / SecOTRMath.h

diff --git a/sec/Security/SecOTRMath.h b/sec/Security/SecOTRMath.h
new file mode 100644 (file)
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+++ b/sec/Security/SecOTRMath.h
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+//
+//  OTRMath.h
+//  libsecurity_libSecOTR
+//
+//  Created by Mitch Adler on 1/28/11.
+//  Copyright 2011 Apple Inc. All rights reserved.
+//
+
+#ifndef _SECOTRMATH_H_
+#define _SECOTRMATH_H_
+
+#include <CoreFoundation/CFBase.h>
+
+#include <corecrypto/ccn.h>
+#include <corecrypto/ccaes.h>
+#include <corecrypto/ccmode.h>
+
+#define kOTRAuthKeyBytes 16
+#define kOTRAuthMACKeyBytes 32
+
+#define kOTRMessageKeyBytes 16
+#define kOTRMessageMacKeyBytes 20
+
+#define kExponentiationBits 1536
+#define kExponentiationUnits ccn_nof(kExponentiationBits)
+#define kExponentiationBytes ((kExponentiationBits+7)/8)
+
+#define kSHA256HMAC160Bits  160
+#define kSHA256HMAC160Bytes (kSHA256HMAC160Bits/8)
+
+// Result and exponent are expected to be kExponentiationUnits big.
+void OTRExponentiate(cc_unit* res, const cc_unit* base, const cc_unit* exponent);
+void OTRGroupExponentiate(cc_unit* result, const cc_unit* exponent);
+
+OSStatus GetRandomBytesInLSBs(size_t bytesOfRandomness, size_t n, cc_unit* place);
+OSStatus FillWithRandomBytes(size_t n, cc_unit* place);
+
+typedef enum {
+    kSSID = 0x00,
+    kCs = 0x01,
+    kM1 = 0x02,
+    kM2 = 0x03,
+    kM1Prime = 0x04,
+    kM2Prime = 0x05
+} KeyType;
+
+
+void DeriveOTR256BitsFromS(KeyType whichKey, size_t sSize, const cc_unit* s, size_t keySize, uint8_t* key);
+void DeriveOTR128BitPairFromS(KeyType whichHalf, size_t sSize, const cc_unit* s,
+                              size_t firstKeySize, uint8_t* firstKey,
+                              size_t secondKeySize, uint8_t* secondKey);
+void DeriveOTR64BitsFromS(KeyType whichKey, size_t sSize, const cc_unit* s,
+                          size_t firstKeySize, uint8_t* firstKey);
+
+
+void AES_CTR_HighHalf_Transform(size_t keySize, const uint8_t* key,
+                                uint64_t highHalf,
+                                size_t howMuch, const uint8_t* from,
+                                uint8_t* to);
+
+void AES_CTR_IV0_Transform(size_t keySize, const uint8_t* key,
+                           size_t howMuch, const uint8_t* from,
+                           uint8_t* to);
+
+#endif