Dual-Field Arithmetic Unit for GF(p) and GF(2 m ) *
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1 Institute for Applied Information Processing and Communications Graz University of Technology Dual-Field Arithmetic Unit for GF(p) and GF(2 m ) * CHES 2002 Workshop on Cryptographic Hardware and Embedded Systems August 2002, Redwood Shores, CA. * This work origins from the European Commission funded project USB_CRYPT established under contract IST in the Information Society Technology (IST) Program Johannes.Wolkerstorfer@iaik.at
2 Motivation Coprocessor For smartcards Application ECDSA Aims Small size Low power Medium throughput SmartCard IO uc ECC RAM ROM AU 19 August
3 Motivation EC signature over GF(2 m ) ECDSA e = SHA-1(Message) k = random(1, n-1) R = k*(g x,g y ) = (R x,r y ) r = R x mod n s = k -1 (e + d r) ECDSA Elliptic-Curve Digital-Signature Algorithm Operations in GF(p) and GF(2 m ) Addition, Multiplication, Inversion, Comparison 19 August 2002 Johannes.Wolkerstorfer@iaik.at 3
4 Proposed architecture A PPG Partial product generator SHIFT Shift unit Carry-save adder Modular reduction unit PPG Carry SHIFT A B C C S A B C C S Sum C 19 August 2002 Johannes.Wolkerstorfer@iaik.at 4
5 PPG - Partial product generator A PPG SHIFT C Generates Partial products A b i for multiplication Negative numbers for subtraction Inv x 0 1 En Q 0 A -A-1 a n-1 a n-2 a 2 a 1 a 0 q n-1 q n-2 q 2 q 1 q 0 inv en 19 August 2002 Johannes.Wolkerstorfer@iaik.at 5
6 Carry-save adder A PPG SHIFT C Fast addition Independent of wordsize n a n-1 b n-1 c n-2 c n-1 a n-2 b n-2 a 2 b 2 c 2 a 1 b 1 c 1 a 0 b 0 c 0 GF(2 m ) A xor B = (A,B,0) a b c FA c s a b c FA c s a b c FA c s a b c FA c s a b c FA c s GF(p) c in c out s n-1 c n-1 s 2 c 2 s 1 c 1 s 0 c 0 19 August 2002 Johannes.Wolkerstorfer@iaik.at 6
7 modular reduction unit A PPG SHIFT C Limits intermediate results to n+2 bit GF(p) Quotient estimated q in {-2, -1, 0, 1, 2} GF(2 m ) Exact quotient q in {0, 1} Q = q P Similar to PPG p n-1 p n-2 p 2 p 1 p 0 0 q n-1 q n-2 q 2 q 1 q 0 shift inv en ~s+c 4 Quotient Estimate GF(p)/ GF(m) en 19 August 2002 Johannes.Wolkerstorfer@iaik.at 7
8 SHIFT Feedback selector A PPG SHIFT C Selects feedback (Cout, Sout) = (0, 0) (Cin, Sin) (Cin shl 1, Sin shl 1) (Cin shr 1, Sin shr 1) MUX Cin n >> 1 << 1 0 >> 1 << 1 0 MUX Sin n n Cout n Sout 19 August 2002 Johannes.Wolkerstorfer@iaik.at 8
9 Operations Addition Input A added to last result GF(p) : Full-adder GF(2 m ) : XOR-gate A 1 PPG SHIFT 1 A B C C S Carry + A B C C S Sum 19 August 2002 Johannes.Wolkerstorfer@iaik.at 9
10 Operations Multiplication Bitserial Multipl. Double & Add n clock cycles Interleaved modular reduction Squaring Done by multiplication A b PPG SHIFT i <<1 A B C C S Carry + A B C C S Sum n times 19 August 2002 Johannes.Wolkerstorfer@iaik.at 10
11 Operations Redundant to binary Conversion of redundant numbers Into binary numbers Hold operation s eliminate carries Approx. 4 cycles for 256-bit architecture 0 PPG SHIFT 1 A B C C S Carry A B C C S Sum 0.5 log 2 n times 19 August 2002 Johannes.Wolkerstorfer@iaik.at 11
12 Operations Inverse Multiplicative inverse a a -1 = 1 mod p in GF(p) A(x) A -1 (x) = 1 mod P(x) in GF(2 m ) Using Extended Euclidean Algorithm Compound multi-cycle operation GF(p): Shift right, Subtraction, Comparison GF(2m): Shift right, Addition, Comparison 19 August 2002 Johannes.Wolkerstorfer@iaik.at 12
13 Operations Summary GF(p) Addition Subtraction Incrementation Multiplication Shift left Shift right Comparison Less than 0 GF(2 m ) Others Addition / Subtraction Clear / Load 0 Multiplication Load A Times x Load!A Div x Load -A Hold Integer Addition Subtraction Incrementation Multiplication XOR Compound Inversion in GF(p) in GF(2m) 19 August 2002 Johannes.Wolkerstorfer@iaik.at 13
14 Results Performance GF(p) performance GF(2 m ) performance MUL [cycles] INV [cycles] ECC pr. [cycles] Bitlength Bitlength MUL [cycles] INV [cycles] ECC pr. [cycles] 192-bit k 720k 163-bit k 490k 224-bit k 900k 233-bit k 905k 256-bit k 1,150k 283-bit k 1,405k 19 August 2002 Johannes.Wolkerstorfer@iaik.at 14
15 Results Circuit complexity Number of gates Estimated die size Bitlength AND XOR MUX2 MUX4 FA REG Area on 0,35 µm CMOS process 163-bit mm² 224-bit mm² 283-bit mm² n-bit 4n+8 2n+4 n+2 2n+4 2n+4 4n+8 19 August
16 Conclusion Dual-field arithmetic unit For GF(p) and GF(2 m ) Processing at full precision Scaleable s prevent carry-propagation Signed number representation Short critical path Regular (simple) structure Low gate count PPG SHIFT Only a little bit larger than a mere GF(p)-multiplier 19 August 2002 Johannes.Wolkerstorfer@iaik.at 16
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