even more ASM-fun now only decryption needs C-Stub
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20f6d949b7
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fabad4ec56
164
seed-asm.S
164
seed-asm.S
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@ -477,7 +477,7 @@ seed_getnextkeys:
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push_range 10, 17
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push_range 10, 17
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push r28
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push r28
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push r29
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push r29
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andi r22, 0x0F
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; andi r22, 0x0F
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bst r22,0
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bst r22,0
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rcall compute_keys
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rcall compute_keys
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brtc even_round
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brtc even_round
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@ -586,7 +586,7 @@ seed_getprevkeys:
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push r28
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push r28
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push r29
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push r29
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movw r28, r24
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movw r28, r24
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andi r22, 0x0F
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; andi r22, 0x0F
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bst r22, 0
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bst r22, 0
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brts r_odd_round
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brts r_odd_round
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r_even_round:
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r_even_round:
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@ -676,3 +676,163 @@ seed_kc:
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.long 0x8d676ede
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.long 0x8d676ede
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.long 0x1bcfdcbc
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.long 0x1bcfdcbc
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/******************************************************************************/
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/*
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#define L (((uint64_t*)buffer)[0])
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#define R (((uint64_t*)buffer)[1])
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void seed_enc(void * buffer, seed_ctx_t * ctx){
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uint8_t r;
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keypair_t k;
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for(r=0; r<8; ++r){
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k = seed_getnextkeys(ctx->k, 2*r);
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/ *
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DEBUG_S("\r\n\tDBG ka,0: "); uart_hexdump(&k.k0, 4);
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DEBUG_S("\r\n\tDBG ka,1: "); uart_hexdump(&k.k1, 4);
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DEBUG_S("\r\n\t DBG L: "); uart_hexdump((uint8_t*)buffer+0, 8);
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DEBUG_S("\r\n\t DBG R: "); uart_hexdump((uint8_t*)buffer+8, 8);
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* /
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L ^= seed_f_function(&R,k.k0,k.k1);
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k = seed_getnextkeys(ctx->k, 2*r+1);
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/ *
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DEBUG_S("\r\n\tDBG kb,0: "); uart_hexdump(&k.k0, 4);
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DEBUG_S("\r\n\tDBG kb,1: "); uart_hexdump(&k.k1, 4);
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DEBUG_S("\r\n\t DBG L: "); uart_hexdump((uint8_t*)buffer+8, 8);
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DEBUG_S("\r\n\t DBG R: "); uart_hexdump((uint8_t*)buffer+0, 8);
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* /
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R ^= seed_f_function(&L,k.k0,k.k1);
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}
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/ * just an exchange without temp. variable * /
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L ^= R;
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R ^= L;
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L ^= R;
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}
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*/
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/*
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* param buffer: r24:r25
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* param ctx: r22:r23
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*/
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CTR = 9
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xLPTR = 10
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xRPTR = 12
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CPTR = 14
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.global seed_enc
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seed_enc:
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push_range 9, 17
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push r28
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push r29
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clr CTR
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movw xLPTR, r24
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adiw r24, 8
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movw xRPTR, r24
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movw CPTR, r22
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1:
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movw r28, xLPTR
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movw r24, CPTR
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mov r22, CTR
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lsl r22
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rcall seed_getnextkeys
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/* use pen & paper to understand the following permutation */
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movw r16, r22
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movw r22, r18
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movw r18, r24
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movw r24, r20
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movw r20, r22
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movw r22, r24
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movw r24, xRPTR
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rcall seed_f_function
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ld r0, Y
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eor r0, r18
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st Y+, r0
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ld r0, Y
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eor r0, r19
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st Y+, r0
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ld r0, Y
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eor r0, r20
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st Y+, r0
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ld r0, Y
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eor r0, r21
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st Y+, r0
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ld r0, Y
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eor r0, r22
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st Y+, r0
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ld r0, Y
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eor r0, r23
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st Y+, r0
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ld r0, Y
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eor r0, r24
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st Y+, r0
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ld r0, Y
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eor r0, r25
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st Y+, r0
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/* secound half */
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movw r24, CPTR
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mov r22, CTR
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lsl r22
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inc r22
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rcall seed_getnextkeys
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movw r16, r22
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movw r22, r18
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movw r18, r24
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movw r24, r20
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movw r20, r22
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movw r22, r24
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movw r24, xLPTR
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rcall seed_f_function
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ld r0, Y
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eor r0, r18
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st Y+, r0
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ld r0, Y
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eor r0, r19
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st Y+, r0
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ld r0, Y
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eor r0, r20
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st Y+, r0
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ld r0, Y
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eor r0, r21
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st Y+, r0
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ld r0, Y
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eor r0, r22
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st Y+, r0
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ld r0, Y
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eor r0, r23
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st Y+, r0
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ld r0, Y
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eor r0, r24
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st Y+, r0
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ld r0, Y
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eor r0, r25
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st Y+, r0
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inc CTR
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bst CTR, 3
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brts 3f
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rjmp 1b
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3:
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movw r28, xLPTR
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movw r30, xRPTR
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ldi r17, 8
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4:
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ld r10, Y
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ld r11, Z
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st Z+, r10
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st Y+, r11
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dec r17
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brne 4b
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5:
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pop r29
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pop r28
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pop_range 9, 17
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ret
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@ -44,7 +44,7 @@ keypair_t seed_getnextkeys(uint32_t *keystate, uint8_t curround);
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keypair_t seed_getprevkeys(uint32_t *keystate, uint8_t curround);
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keypair_t seed_getprevkeys(uint32_t *keystate, uint8_t curround);
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/******************************************************************************/
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/******************************************************************************/
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#if 0
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#define L (((uint64_t*)buffer)[0])
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#define L (((uint64_t*)buffer)[0])
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#define R (((uint64_t*)buffer)[1])
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#define R (((uint64_t*)buffer)[1])
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@ -75,6 +75,7 @@ void seed_enc(void * buffer, seed_ctx_t * ctx){
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R ^= L;
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R ^= L;
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L ^= R;
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L ^= R;
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}
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}
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#endif
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/******************************************************************************/
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/******************************************************************************/
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@ -117,5 +118,3 @@ void seed_dec(void * buffer, seed_ctx_t * ctx){
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