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cryptobyte: add uint48 methods

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Adds uint48 methods for cryptobyte.Builder and cryptobyte.String.
Supporting 48-bit unsigned integers is useful for working with protocols
that use them for sequence numbers, such as DTLS.

Fixes golang/go#61275

Change-Id: Ibe49422d37644b9212b28b123dc5e01850f7b05b
GitHub-Last-Rev: 11b388c240109c8f4ac23880645c901ce6d2f093
GitHub-Pull-Request: golang/crypto#265
Reviewed-on: https://go-review.googlesource.com/c/crypto/+/508675
Reviewed-by: Roland Shoemaker <roland@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: qiulaidongfeng <2645477756@qq.com>
Run-TryBot: Roland Shoemaker <roland@golang.org>
Auto-Submit: Roland Shoemaker <roland@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
This commit is contained in:
Daniel Mangum
2023-09-07 16:27:37 +00:00
committed by Gopher Robot
parent d359caa4a3
commit e90f1e17ee
3 changed files with 37 additions and 0 deletions
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cryptobyte/string.go
+11
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@@ -81,6 +81,17 @@ func (s *String) ReadUint32(out *uint32) bool {
return true
}
// ReadUint48 decodes a big-endian, 48-bit value into out and advances over it.
// It reports whether the read was successful.
func (s *String) ReadUint48(out *uint64) bool {
v := s.read(6)
if v == nil {
return false
}
*out = uint64(v[0])<<40 | uint64(v[1])<<32 | uint64(v[2])<<24 | uint64(v[3])<<16 | uint64(v[4])<<8 | uint64(v[5])
return true
}
// ReadUint64 decodes a big-endian, 64-bit value into out and advances over it.
// It reports whether the read was successful.
func (s *String) ReadUint64(out *uint64) bool {