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internal/cpu: add detection for the new ECDSA and EDDSA capabilities on s390x

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This CL will check for the Message-Security-Assist Extension 9 facility
which enables the KDSA instruction.

Change-Id: I659aac09726e0999ec652ef1f5983072c8131a48
Reviewed-on: https://go-review.googlesource.com/c/go/+/174529
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
bill_ofarrell 2019-04-30 17:15:39 -04:00 committed by Brad Fitzpatrick
parent 43b9fcf6fe
commit ba978f5fff
4 changed files with 35 additions and 0 deletions
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1
src/cmd/vet/all/whitelist/s390x.txt
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@ -10,6 +10,7 @@ internal/cpu/cpu_s390x.s: [s390x] kmctrQuery: invalid MOVD of ret+0(FP); interna
internal/cpu/cpu_s390x.s: [s390x] kmaQuery: invalid MOVD of ret+0(FP); internal/cpu.queryResult is 16-byte value
internal/cpu/cpu_s390x.s: [s390x] kimdQuery: invalid MOVD of ret+0(FP); internal/cpu.queryResult is 16-byte value
internal/cpu/cpu_s390x.s: [s390x] klmdQuery: invalid MOVD of ret+0(FP); internal/cpu.queryResult is 16-byte value
internal/cpu/cpu_s390x.s: [s390x] kdsaQuery: invalid MOVD of ret+0(FP); internal/cpu.queryResult is 16-byte value
vendor/golang.org/x/sys/cpu/cpu_s390x.s: [s390x] stfle: invalid MOVD of ret+0(FP); vendor/golang.org/x/sys/cpu.facilityList is 32-byte value
vendor/golang.org/x/sys/cpu/cpu_s390x.s: [s390x] kmQuery: invalid MOVD of ret+0(FP); vendor/golang.org/x/sys/cpu.queryResult is 16-byte value
vendor/golang.org/x/sys/cpu/cpu_s390x.s: [s390x] kmcQuery: invalid MOVD of ret+0(FP); vendor/golang.org/x/sys/cpu.queryResult is 16-byte value

3
src/internal/cpu/cpu.go
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@ -128,6 +128,9 @@ type s390x struct {
HasSHA3 bool // K{I,L}MD-SHA3-{224,256,384,512} and K{I,L}MD-SHAKE-{128,256} functions
HasVX bool // vector facility. Note: the runtime sets this when it processes auxv records.
HasVXE bool // vector-enhancements facility 1
HasKDSA bool // elliptic curve functions
HasECDSA bool // NIST curves
HasEDDSA bool // Edwards curves
_ CacheLinePad
}

23
src/internal/cpu/cpu_s390x.go
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@ -36,6 +36,20 @@ const (
ghash function = 65 // GHASH
)
const (
// KDSA function codes
ecdsaVerifyP256 function = 1 // NIST P256
ecdsaVerifyP384 function = 2 // NIST P384
ecdsaVerifyP521 function = 3 // NIST P521
ecdsaSignP256 function = 9 // NIST P256
ecdsaSignP384 function = 10 // NIST P384
ecdsaSignP521 function = 11 // NIST P521
eddsaVerifyEd25519 function = 32 // Curve25519
eddsaVerifyEd448 function = 36 // Curve448
eddsaSignEd25519 function = 40 // Curve25519
eddsaSignEd448 function = 44 // Curve448
)
// queryResult contains the result of a Query function
// call. Bits are numbered in big endian order so the
// leftmost bit (the MSB) is at index 0.
@ -76,6 +90,7 @@ const (
msa4 facility = 77 // message-security-assist extension 4
msa5 facility = 57 // message-security-assist extension 5
msa8 facility = 146 // message-security-assist extension 8
msa9 facility = 155 // message-security-assist extension 9
// vector facilities
vxe facility = 135 // vector-enhancements 1
@ -113,6 +128,7 @@ func kmctrQuery() queryResult
func kmaQuery() queryResult
func kimdQuery() queryResult
func klmdQuery() queryResult
func kdsaQuery() queryResult
func doinit() {
options = []option{
@ -125,6 +141,7 @@ func doinit() {
{Name: "etf3eh", Feature: &S390X.HasETF3EH},
{Name: "vx", Feature: &S390X.HasVX},
{Name: "vxe", Feature: &S390X.HasVXE},
{Name: "kdsa", Feature: &S390X.HasKDSA},
}
aes := []function{aes128, aes192, aes256}
@ -164,6 +181,12 @@ func doinit() {
shake128, shake256,
}
S390X.HasSHA3 = kimd.Has(sha3...) && klmd.Has(sha3...)
S390X.HasKDSA = facilities.Has(msa9) // elliptic curves
if S390X.HasKDSA {
kdsa := kdsaQuery()
S390X.HasECDSA = kdsa.Has(ecdsaVerifyP256, ecdsaSignP256, ecdsaVerifyP384, ecdsaSignP384, ecdsaVerifyP521, ecdsaSignP521)
S390X.HasEDDSA = kdsa.Has(eddsaVerifyEd25519, eddsaSignEd25519, eddsaVerifyEd448, eddsaSignEd448)
}
}
if S390X.HasVX {
S390X.HasVXE = facilities.Has(vxe)

8
src/internal/cpu/cpu_s390x.s
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@ -53,3 +53,11 @@ TEXT ·klmdQuery(SB), NOSPLIT|NOFRAME, $0-16
MOVD $ret+0(FP), R1 // address of 16-byte return value
WORD $0xB93F0024 // compute last message digest (KLMD)
RET
// func kdsaQuery() queryResult
TEXT ·kdsaQuery(SB), NOSPLIT|NOFRAME, $0-16
MOVD $0, R0 // set function code to 0 (KLMD-Query)
MOVD $ret+0(FP), R1 // address of 16-byte return value
WORD $0xB93A0008 // compute digital signature authentication
RET