crypto/x509: support SHA-512 by default.

Comodo are now using a SHA-384 signed intermediate. The crypto/x509
package seeks to import hash functions needed for typical operation
without needing to import every hash function possible. Since a SHA-384
certificate is being used by Comodo, crypto/sha512 now appears to fall
into the scope of "typical operation".

R=bradfitz

LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/87670045

src/pkg/crypto/x509/verify_test.go

@@ -209,6 +209,23 @@ var verifyTests = []verifyTest{
 			},
 		},
 	},
+	{
+		// Check that SHA-384 intermediates (which are popping up)
+		// work.
+		leaf:          moipLeafCert,
+		intermediates: []string{comodoIntermediateSHA384},
+		roots:         []string{comodoRSARoot},
+		currentTime:   1397502195,
+		dnsName:       "api.moip.com.br",
+
+		expectedChains: [][]string{
+			{
+				"api.moip.com.br",
+				"COMODO RSA Extended Validation Secure Server CA",
+				"COMODO RSA Certification Authority",
+			},
+		},
+	},
 }
 
 func expectHostnameError(t *testing.T, i int, err error) (ok bool) {
@@ -971,3 +988,109 @@ AbEVtQwdpf5pLGkkeB6zpxxxYu7KyJesF12KwvhHhm4qxFYxldBniYUr+WymXUad
 DKqC5JlR3XC321Y9YeRq4VzW9v493kHMB65jUr9TU/Qr6cf9tveCX4XSQRjbgbME
 HMUfpIBvFSDJ3gyICh3WZlXi/EjJKSZp4A==
 -----END CERTIFICATE-----`
+
+var moipLeafCert = `-----BEGIN CERTIFICATE-----
+MIIGQDCCBSigAwIBAgIRAPe/cwh7CUWizo8mYSDavLIwDQYJKoZIhvcNAQELBQAw
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+UvV0N1ZbEVRYpN9kuX/3vjDghjDmzzBwu8a/T+y5JTym5uiJlngVAWyh/RjtIvYi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+jhuy8PqqZS9OuLilTeLu4a8z2JI=
+-----END CERTIFICATE-----`
+
+var comodoIntermediateSHA384 = `-----BEGIN CERTIFICATE-----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+ueQOqdL6fp1pMA4GA1UdDwEB/wQEAwIBBjASBgNVHRMBAf8ECDAGAQH/AgEAMD4G
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+BgEFBQcBAQRlMGMwOwYIKwYBBQUHMAKGL2h0dHA6Ly9jcnQuY29tb2RvY2EuY29t
+L0NPTU9ET1JTQUFkZFRydXN0Q0EuY3J0MCQGCCsGAQUFBzABhhhodHRwOi8vb2Nz
+cC5jb21vZG9jYS5jb20wDQYJKoZIhvcNAQEMBQADggIBAERCnUFRK0iIXZebeV4R
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+jCuN/gI9JN6pXV/kD0fQ22YlPodHDK4ixVAihNftSlka9pOlk7DgG4HyVsTIEFPk
+1Hax0VtpS3ey4E/EhOfUoFDuPPpE/NBXueEoU/1Tzdy5H3pAvTA/2GzS8+cHnx8i
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+pLwltum95OmYdBbxN4SBB7SC
+-----END CERTIFICATE-----`
+
+const comodoRSARoot = `-----BEGIN CERTIFICATE-----
+MIIFdDCCBFygAwIBAgIQJ2buVutJ846r13Ci/ITeIjANBgkqhkiG9w0BAQwFADBv
+MQswCQYDVQQGEwJTRTEUMBIGA1UEChMLQWRkVHJ1c3QgQUIxJjAkBgNVBAsTHUFk
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+2RRr55yzhaCCenavcZDX7P0N+pxs+t+wgvQUfvm+xKYvT3+Zf7X8Z0NyvQwA1onr
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+pu/xO28QOG8=
+-----END CERTIFICATE-----`

src/pkg/crypto/x509/x509.go

@@ -14,6 +14,7 @@ import (
 	"crypto/rsa"
 	"crypto/sha1"
 	_ "crypto/sha256"
+	_ "crypto/sha512"
 	"crypto/x509/pkix"
 	"encoding/asn1"
 	"encoding/pem"