diff options
Diffstat (limited to 'src/crypto/rand/asm/rdrand-x86_64.pl')
| -rw-r--r-- | src/crypto/rand/asm/rdrand-x86_64.pl | 52 |
1 files changed, 1 insertions, 51 deletions
diff --git a/src/crypto/rand/asm/rdrand-x86_64.pl b/src/crypto/rand/asm/rdrand-x86_64.pl index c32a55c..a917611 100644 --- a/src/crypto/rand/asm/rdrand-x86_64.pl +++ b/src/crypto/rand/asm/rdrand-x86_64.pl @@ -1,19 +1,5 @@ #!/usr/bin/env perl -# Copyright (c) 2015, Google Inc. -# -# Permission to use, copy, modify, and/or distribute this software for any -# purpose with or without fee is hereby granted, provided that the above -# copyright notice and this permission notice appear in all copies. -# -# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES -# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF -# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY -# SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES -# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION -# OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN -# CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ - $flavour = shift; $output = shift; if ($flavour =~ /\./) { $output = $flavour; undef $flavour; } @@ -28,47 +14,11 @@ open OUT,"| \"$^X\" $xlate $flavour $output"; print<<___; .text -# CRYPTO_rdrand writes eight bytes of random data from the hardware RNG to -# |out|. It returns one on success or zero on hardware failure. -# int CRYPTO_rdrand(uint8_t out[8]); .globl CRYPTO_rdrand .type CRYPTO_rdrand,\@function,1 .align 16 CRYPTO_rdrand: - xorq %rax, %rax - # This is rdrand %rcx. It sets rcx to a random value and sets the carry - # flag on success. - .byte 0x48, 0x0f, 0xc7, 0xf1 - # An add-with-carry of zero effectively sets %rax to the carry flag. - adcq %rax, %rax - movq %rcx, 0(%rdi) - retq - -# CRYPTO_rdrand_multiple8_buf fills |len| bytes at |buf| with random data from -# the hardware RNG. The |len| argument must be a multiple of eight. It returns -# one on success and zero on hardware failure. -# int CRYPTO_rdrand_multiple8_buf(uint8_t *buf, size_t len); -.globl CRYPTO_rdrand_multiple8_buf -.type CRYPTO_rdrand_multiple8_buf,\@function,2 -.align 16 -CRYPTO_rdrand_multiple8_buf: - test %rsi, %rsi - jz .Lout - movq \$8, %rdx -.Lloop: - # This is rdrand %rcx. It sets rcx to a random value and sets the carry - # flag on success. - .byte 0x48, 0x0f, 0xc7, 0xf1 - jnc .Lerr - movq %rcx, 0(%rdi) - addq %rdx, %rdi - subq %rdx, %rsi - jnz .Lloop -.Lout: - movq \$1, %rax - retq -.Lerr: - xorq %rax, %rax + .byte 0x48, 0x0f, 0xc7, 0xf0 retq ___ |