3 # ====================================================================
4 # Written by Andy Polyakov <appro@fy.chalmers.se> for the OpenSSL
5 # project. The module is, however, dual licensed under OpenSSL and
6 # CRYPTOGAMS licenses depending on where you obtain it. For further
7 # details see http://www.openssl.org/~appro/cryptogams/.
8 # ====================================================================
10 # SHA256 block procedure for ARMv4. May 2007.
12 # Performance is ~2x better than gcc 3.4 generated code and in "abso-
13 # lute" terms is ~2250 cycles per 64-byte block or ~35 cycles per
28 @V=($A,$B,$C,$D,$E,$F,$G,$H);
38 my ($i,$a,$b,$c,$d,$e,$f,$g,$h) = @_;
40 $code.=<<___ if ($i<16);
41 ldrb $T1,[$inp,#3] @ $i
46 orr $T1,$T1,$t1,lsl#16
47 orr $T1,$T1,$t0,lsl#24
48 `"str $inp,[sp,#17*4]" if ($i==15)`
51 ldr $t2,[$Ktbl],#4 @ *K256++
52 str $T1,[sp,#`$i%16`*4]
53 mov $t0,$e,ror#$Sigma1[0]
54 eor $t0,$t0,$e,ror#$Sigma1[1]
55 eor $t0,$t0,$e,ror#$Sigma1[2] @ Sigma1(e)
59 eor $t1,$t1,$g @ Ch(e,f,g)
63 mov $h,$a,ror#$Sigma0[0]
64 eor $h,$h,$a,ror#$Sigma0[1]
65 eor $h,$h,$a,ror#$Sigma0[2] @ Sigma0(a)
69 orr $t0,$t0,$t1 @ Maj(a,b,c)
77 my ($i,$a,$b,$c,$d,$e,$f,$g,$h) = @_;
80 ldr $t1,[sp,#`($i+1)%16`*4] @ $i
81 ldr $t2,[sp,#`($i+14)%16`*4]
82 ldr $T1,[sp,#`($i+0)%16`*4]
83 ldr $inp,[sp,#`($i+9)%16`*4]
84 mov $t0,$t1,ror#$sigma0[0]
85 eor $t0,$t0,$t1,ror#$sigma0[1]
86 eor $t0,$t0,$t1,lsr#$sigma0[2] @ sigma0(X[i+1])
87 mov $t1,$t2,ror#$sigma1[0]
88 eor $t1,$t1,$t2,ror#$sigma1[1]
89 eor $t1,$t1,$t2,lsr#$sigma1[2] @ sigma1(X[i+14])
104 .word 0x428a2f98,0x71374491,0xb5c0fbcf,0xe9b5dba5
105 .word 0x3956c25b,0x59f111f1,0x923f82a4,0xab1c5ed5
106 .word 0xd807aa98,0x12835b01,0x243185be,0x550c7dc3
107 .word 0x72be5d74,0x80deb1fe,0x9bdc06a7,0xc19bf174
108 .word 0xe49b69c1,0xefbe4786,0x0fc19dc6,0x240ca1cc
109 .word 0x2de92c6f,0x4a7484aa,0x5cb0a9dc,0x76f988da
110 .word 0x983e5152,0xa831c66d,0xb00327c8,0xbf597fc7
111 .word 0xc6e00bf3,0xd5a79147,0x06ca6351,0x14292967
112 .word 0x27b70a85,0x2e1b2138,0x4d2c6dfc,0x53380d13
113 .word 0x650a7354,0x766a0abb,0x81c2c92e,0x92722c85
114 .word 0xa2bfe8a1,0xa81a664b,0xc24b8b70,0xc76c51a3
115 .word 0xd192e819,0xd6990624,0xf40e3585,0x106aa070
116 .word 0x19a4c116,0x1e376c08,0x2748774c,0x34b0bcb5
117 .word 0x391c0cb3,0x4ed8aa4a,0x5b9cca4f,0x682e6ff3
118 .word 0x748f82ee,0x78a5636f,0x84c87814,0x8cc70208
119 .word 0x90befffa,0xa4506ceb,0xbef9a3f7,0xc67178f2
122 .global sha256_block_data_order
123 .type sha256_block_data_order,%function
124 sha256_block_data_order:
125 sub r3,pc,#8 @ sha256_block_data_order
126 add $len,$inp,$len,lsl#6 @ len to point at the end of inp
127 stmdb sp!,{$ctx,$inp,$len,r4-r12,lr}
128 ldmia $ctx,{$A,$B,$C,$D,$E,$F,$G,$H}
129 sub $Ktbl,r3,#256 @ K256
130 sub sp,sp,#16*4 @ alloca(X[16])
133 for($i=0;$i<16;$i++) { &BODY_00_15($i,@V); unshift(@V,pop(@V)); }
134 $code.=".Lrounds_16_xx:\n";
135 for (;$i<32;$i++) { &BODY_16_XX($i,@V); unshift(@V,pop(@V)); }
141 ldr $T1,[sp,#16*4] @ pull ctx
156 ldr $inp,[sp,#17*4] @ pull inp
157 ldr $t2,[sp,#18*4] @ pull inp+len
160 stmia $T1,{$A,$B,$C,$D,$E,$F,$G,$H}
162 sub $Ktbl,$Ktbl,#256 @ rewind Ktbl
165 add sp,sp,#`16+3`*4 @ destroy frame
166 ldmia sp!,{r4-r12,lr}
168 moveq pc,lr @ be binary compatible with V4, yet
169 bx lr @ interoperable with Thumb ISA:-)
170 .size sha256_block_data_order,.-sha256_block_data_order
171 .asciz "SHA256 block transform for ARMv4, CRYPTOGAMS by <appro\@openssl.org>"
174 $code =~ s/\`([^\`]*)\`/eval $1/gem;