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crypto/tls: disable AES-GCM prioritization on arm64 for now

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This commit is contained in:
Anit Gandhi 2018-05-23 18:02:28 -04:00
parent bf8cbdf9a1
commit a611e3ecb1
1 changed files with 8 additions and 1 deletions
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9
src/crypto/tls/common.go
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@ -921,7 +921,14 @@ func initDefaultCipherSuites() {
// Check the cpu flags for each platform that has optimized GCM implementations.
// Worst case, these variables will just all be false
hasGCMAsmAMD64 := cpu.X86.HasAES && cpu.X86.HasPCLMULQDQ
hasGCMAsmARM64 := cpu.ARM64.HasAES && cpu.ARM64.HasPMULL
// TODO: enable the arm64 HasAES && HasPMULL feature check after the
// optimized AES-GCM implementation for arm64 is merged (CL 107298).
// This is explicitly set to false for now to prevent misprioritization
// of AES-GCM based cipher suites, which will be slower than chacha20-poly1305
hasGCMAsmARM64 := false
// hasGCMAsmARM64 := cpu.ARM64.HasAES && cpu.ARM64.HasPMULL
hasGCMAsmS390X := cpu.S390X.HasKM && (cpu.S390X.HasKMA || (cpu.S390X.HasKMCTR && cpu.S390X.HasKIMD))
hasGCMAsm := hasGCMAsmAMD64 || hasGCMAsmARM64 || hasGCMAsmS390X