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crypto: document that Signer.Sign does not hash

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Fixes #13938.

Change-Id: I0b4842b8bc22dc79323d6894c123cde638f52d3f
Reviewed-on: https://go-review.googlesource.com/18856
Reviewed-by: Adam Langley <agl@golang.org>
This commit is contained in:
Russ Cox 2016-01-23 23:43:08 -05:00
parent 038b813943
commit b4c9d01d81
1 changed files with 6 additions and 2 deletions
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8
src/crypto/crypto.go
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@ -109,7 +109,7 @@ type Signer interface {
// private key.
Public() PublicKey
// Sign signs msg with the private key, possibly using entropy from
// Sign signs digest with the private key, possibly using entropy from
// rand. For an RSA key, the resulting signature should be either a
// PKCS#1 v1.5 or PSS signature (as indicated by opts). For an (EC)DSA
// key, it should be a DER-serialised, ASN.1 signature structure.
@ -118,7 +118,11 @@ type Signer interface {
// simply pass in the hash function used as opts. Sign may also attempt
// to type assert opts to other types in order to obtain algorithm
// specific values. See the documentation in each package for details.
Sign(rand io.Reader, msg []byte, opts SignerOpts) (signature []byte, err error)
//
// Note that when a signature of a hash of a larger message is needed,
// the caller is responsible for hashing the larger message and passing
// the hash (as digest) and the hash function (as opts) to Sign.
Sign(rand io.Reader, digest []byte, opts SignerOpts) (signature []byte, err error)
}
// SignerOpts contains options for signing with a Signer.