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crypto/x509: fix panic when using unavailable hash function.

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crypto.Hash.New() changed to panicking when the hash function isn't
linked in, but crypto/x509 still expects it to return nil.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/6175047
This commit is contained in:
Adam Langley 2012-05-03 16:39:57 -04:00
parent 278d4a583d
commit c8e1946f33
1 changed files with 2 additions and 2 deletions
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4
src/pkg/crypto/x509/x509.go
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@ -388,10 +388,10 @@ func (c *Certificate) CheckSignature(algo SignatureAlgorithm, signed, signature
return ErrUnsupportedAlgorithm
}
h := hashType.New()
if h == nil {
if !hashType.Available() {
return ErrUnsupportedAlgorithm
}
h := hashType.New()
h.Write(signed)
digest := h.Sum(nil)