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X25519 when not AVX2

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This commit is contained in:
Sean Parkinson
2019-05-31 10:12:46 +10:00
parent 6564d03369
commit e01ae09809
1 changed files with 54 additions and 54 deletions
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108
wolfcrypt/src/fe_x25519_asm.S
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@ -2045,56 +2045,6 @@ L_curve25519_x64_bits:
xorq %r11, 56(%rsp)
movq %rbp, %rbx
# Add
movq 64(%rsp), %rcx
movq 72(%rsp), %r9
movq 80(%rsp), %r10
movq 88(%rsp), %rbp
movq %rcx, %r12
addq 32(%rsp), %rcx
movq %r9, %r13
adcq 40(%rsp), %r9
movq %r10, %r14
adcq 48(%rsp), %r10
movq %rbp, %r15
adcq 56(%rsp), %rbp
movq $-19, %rax
movq %rbp, %r11
movq $0x7fffffffffffffff, %rdx
sarq $63, %rbp
# Mask the modulus
andq %rbp, %rax
andq %rbp, %rdx
# Sub modulus (if overflow)
subq %rax, %rcx
sbbq %rbp, %r9
sbbq %rbp, %r10
sbbq %rdx, %r11
# Sub
subq 32(%rsp), %r12
movq $0x00, %rbp
sbbq 40(%rsp), %r13
movq $-19, %rax
sbbq 48(%rsp), %r14
movq $0x7fffffffffffffff, %rdx
sbbq 56(%rsp), %r15
sbbq $0x00, %rbp
# Mask the modulus
andq %rbp, %rax
andq %rbp, %rdx
# Add modulus (if underflow)
addq %rax, %r12
adcq %rbp, %r13
adcq %rbp, %r14
adcq %rdx, %r15
movq %rcx, (%rdi)
movq %r9, 8(%rdi)
movq %r10, 16(%rdi)
movq %r11, 24(%rdi)
movq %r12, 96(%rsp)
movq %r13, 104(%rsp)
movq %r14, 112(%rsp)
movq %r15, 120(%rsp)
# Add
movq (%rdi), %rcx
movq 8(%rdi), %r9
movq 16(%rdi), %r10
@ -2136,14 +2086,64 @@ L_curve25519_x64_bits:
adcq %rbp, %r13
adcq %rbp, %r14
adcq %rdx, %r15
movq %rcx, (%rsp)
movq %r9, 8(%rsp)
movq %r10, 16(%rsp)
movq %r11, 24(%rsp)
movq %rcx, (%rdi)
movq %r9, 8(%rdi)
movq %r10, 16(%rdi)
movq %r11, 24(%rdi)
movq %r12, 128(%rsp)
movq %r13, 136(%rsp)
movq %r14, 144(%rsp)
movq %r15, 152(%rsp)
# Add
movq 64(%rsp), %rcx
movq 72(%rsp), %r9
movq 80(%rsp), %r10
movq 88(%rsp), %rbp
movq %rcx, %r12
addq 32(%rsp), %rcx
movq %r9, %r13
adcq 40(%rsp), %r9
movq %r10, %r14
adcq 48(%rsp), %r10
movq %rbp, %r15
adcq 56(%rsp), %rbp
movq $-19, %rax
movq %rbp, %r11
movq $0x7fffffffffffffff, %rdx
sarq $63, %rbp
# Mask the modulus
andq %rbp, %rax
andq %rbp, %rdx
# Sub modulus (if overflow)
subq %rax, %rcx
sbbq %rbp, %r9
sbbq %rbp, %r10
sbbq %rdx, %r11
# Sub
subq 32(%rsp), %r12
movq $0x00, %rbp
sbbq 40(%rsp), %r13
movq $-19, %rax
sbbq 48(%rsp), %r14
movq $0x7fffffffffffffff, %rdx
sbbq 56(%rsp), %r15
sbbq $0x00, %rbp
# Mask the modulus
andq %rbp, %rax
andq %rbp, %rdx
# Add modulus (if underflow)
addq %rax, %r12
adcq %rbp, %r13
adcq %rbp, %r14
adcq %rdx, %r15
movq %rcx, (%rsp)
movq %r9, 8(%rsp)
movq %r10, 16(%rsp)
movq %r11, 24(%rsp)
movq %r12, 96(%rsp)
movq %r13, 104(%rsp)
movq %r14, 112(%rsp)
movq %r15, 120(%rsp)
# Multiply
# A[0] * B[0]
movq (%rdi), %rax