summaryrefslogtreecommitdiffstats
path: root/security/nss/lib/freebl/arcfour-amd64-sun.s
diff options
context:
space:
mode:
Diffstat (limited to 'security/nss/lib/freebl/arcfour-amd64-sun.s')
-rw-r--r--security/nss/lib/freebl/arcfour-amd64-sun.s84
1 files changed, 84 insertions, 0 deletions
diff --git a/security/nss/lib/freebl/arcfour-amd64-sun.s b/security/nss/lib/freebl/arcfour-amd64-sun.s
new file mode 100644
index 000000000..8b649f901
--- /dev/null
+++ b/security/nss/lib/freebl/arcfour-amd64-sun.s
@@ -0,0 +1,84 @@
+/ This Source Code Form is subject to the terms of the Mozilla Public
+/ License, v. 2.0. If a copy of the MPL was not distributed with this
+/ file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+/ ** ARCFOUR implementation optimized for AMD64.
+/ **
+/ ** The throughput achieved by this code is about 320 MBytes/sec, on
+/ ** a 1.8 GHz AMD Opteron (rev C0) processor.
+
+.text
+.align 16
+.globl ARCFOUR
+.type ARCFOUR,@function
+ARCFOUR:
+ pushq %rbp
+ pushq %rbx
+ movq %rdi, %rbp / key = ARG(key)
+ movq %rsi, %rbx / rbx = ARG(len)
+ movq %rdx, %rsi / in = ARG(in)
+ movq %rcx, %rdi / out = ARG(out)
+ movq (%rbp), %rcx / x = key->x
+ movq 8(%rbp), %rdx / y = key->y
+ addq $16, %rbp / d = key->data
+ incq %rcx / x++
+ andq $255, %rcx / x &= 0xff
+ leaq -8(%rbx,%rsi), %rbx / rbx = in+len-8
+ movq %rbx, %r9 / tmp = in+len-8
+ movq 0(%rbp,%rcx,8), %rax / tx = d[x]
+ cmpq %rsi, %rbx / cmp in with in+len-8
+ jl .Lend / jump if (in+len-8 < in)
+
+.Lstart:
+ addq $8, %rsi / increment in
+ addq $8, %rdi / increment out
+
+ / generate the next 8 bytes of the rc4 stream into %r8
+ movq $8, %r11 / byte counter
+1: addb %al, %dl / y += tx
+ movl 0(%rbp,%rdx,8), %ebx / ty = d[y]
+ movl %ebx, 0(%rbp,%rcx,8) / d[x] = ty
+ addb %al, %bl / val = ty + tx
+ movl %eax, 0(%rbp,%rdx,8) / d[y] = tx
+ incb %cl / x++ (NEXT ROUND)
+ movl 0(%rbp,%rcx,8), %eax / tx = d[x] (NEXT ROUND)
+ movb 0(%rbp,%rbx,8), %r8b / val = d[val]
+ decb %r11b
+ rorq $8, %r8 / (ror does not change ZF)
+ jnz 1b
+
+ / xor 8 bytes
+ xorq -8(%rsi), %r8
+ cmpq %r9, %rsi / cmp in+len-8 with in
+ movq %r8, -8(%rdi)
+ jle .Lstart / jump if (in <= in+len-8)
+
+.Lend:
+ addq $8, %r9 / tmp = in+len
+
+ / handle the last bytes, one by one
+1: cmpq %rsi, %r9 / cmp in with in+len
+ jle .Lfinished / jump if (in+len <= in)
+ addb %al, %dl / y += tx
+ movl 0(%rbp,%rdx,8), %ebx / ty = d[y]
+ movl %ebx, 0(%rbp,%rcx,8) / d[x] = ty
+ addb %al, %bl / val = ty + tx
+ movl %eax, 0(%rbp,%rdx,8) / d[y] = tx
+ incb %cl / x++ (NEXT ROUND)
+ movl 0(%rbp,%rcx,8), %eax / tx = d[x] (NEXT ROUND)
+ movb 0(%rbp,%rbx,8), %r8b / val = d[val]
+ xorb (%rsi), %r8b / xor 1 byte
+ movb %r8b, (%rdi)
+ incq %rsi / in++
+ incq %rdi / out++
+ jmp 1b
+
+.Lfinished:
+ decq %rcx / x--
+ movb %dl, -8(%rbp) / key->y = y
+ movb %cl, -16(%rbp) / key->x = x
+ popq %rbx
+ popq %rbp
+ ret
+.L_ARCFOUR_end:
+.size ARCFOUR,.L_ARCFOUR_end-ARCFOUR