22
33use core:: fmt:: { self , Debug , Display } ;
44
5- #[ cfg( feature = "std " ) ]
6- use std :: boxed:: Box ;
5+ #[ cfg( feature = "alloc " ) ]
6+ use alloc :: boxed:: Box ;
77
88/// Result type.
99///
@@ -16,17 +16,16 @@ pub type Result<T> = core::result::Result<T, Error>;
1616/// could potentially be used recover signing private keys or forge signatures
1717/// (e.g. [BB'06]).
1818///
19- /// When the `std` feature is enabled, it impls [`std::error::Error`] and
20- /// supports an optional [`std::error::Error::source`], which can be used by
21- /// things like remote signers (e.g. HSM, KMS) to report I/O or auth errors.
19+ /// When the `alloc` feature is enabled, it supports an optional [`core::error::Error::source`],
20+ /// which can be used by things like remote signers (e.g. HSM, KMS) to report I/O or auth errors.
2221///
2322/// [BB'06]: https://en.wikipedia.org/wiki/Daniel_Bleichenbacher
2423#[ derive( Default ) ]
2524#[ non_exhaustive]
2625pub struct Error {
2726 /// Source of the error (if applicable).
28- #[ cfg( feature = "std " ) ]
29- source : Option < Box < dyn std :: error:: Error + Send + Sync + ' static > > ,
27+ #[ cfg( feature = "alloc " ) ]
28+ source : Option < Box < dyn core :: error:: Error + Send + Sync + ' static > > ,
3029}
3130
3231impl Error {
@@ -41,9 +40,9 @@ impl Error {
4140/// errors e.g. signature parsing or verification errors. The intended use
4241/// cases are for propagating errors related to external signers, e.g.
4342/// communication/authentication errors with HSMs, KMS, etc.
44- #[ cfg( feature = "std " ) ]
43+ #[ cfg( feature = "alloc " ) ]
4544 pub fn from_source (
46- source : impl Into < Box < dyn std :: error:: Error + Send + Sync + ' static > > ,
45+ source : impl Into < Box < dyn core :: error:: Error + Send + Sync + ' static > > ,
4746 ) -> Self {
4847 Self {
4948 source : Some ( source. into ( ) ) ,
@@ -52,12 +51,12 @@ impl Error {
5251}
5352
5453impl Debug for Error {
55- #[ cfg( not( feature = "std " ) ) ]
54+ #[ cfg( not( feature = "alloc " ) ) ]
5655 fn fmt ( & self , f : & mut fmt:: Formatter < ' _ > ) -> fmt:: Result {
5756 f. write_str ( "signature::Error {}" )
5857 }
5958
60- #[ cfg( feature = "std " ) ]
59+ #[ cfg( feature = "alloc " ) ]
6160 fn fmt ( & self , f : & mut fmt:: Formatter < ' _ > ) -> fmt:: Result {
6261 f. write_str ( "signature::Error { source: " ) ?;
6362
@@ -77,31 +76,37 @@ impl Display for Error {
7776 }
7877}
7978
80- #[ cfg( feature = "std " ) ]
81- impl From < Box < dyn std :: error:: Error + Send + Sync + ' static > > for Error {
82- fn from ( source : Box < dyn std :: error:: Error + Send + Sync + ' static > ) -> Error {
79+ #[ cfg( feature = "alloc " ) ]
80+ impl From < Box < dyn core :: error:: Error + Send + Sync + ' static > > for Error {
81+ fn from ( source : Box < dyn core :: error:: Error + Send + Sync + ' static > ) -> Error {
8382 Self :: from_source ( source)
8483 }
8584}
8685
8786#[ cfg( feature = "rand_core" ) ]
8887impl From < rand_core:: Error > for Error {
89- #[ cfg( not( feature = "std " ) ) ]
88+ #[ cfg( not( feature = "alloc " ) ) ]
9089 fn from ( _source : rand_core:: Error ) -> Error {
9190 Error :: new ( )
9291 }
9392
94- #[ cfg( feature = "std " ) ]
93+ #[ cfg( feature = "alloc " ) ]
9594 fn from ( source : rand_core:: Error ) -> Error {
9695 Error :: from_source ( source)
9796 }
9897}
9998
100- #[ cfg( feature = "std" ) ]
101- impl std:: error:: Error for Error {
102- fn source ( & self ) -> Option < & ( dyn std:: error:: Error + ' static ) > {
103- self . source
104- . as_ref ( )
105- . map ( |source| source. as_ref ( ) as & ( dyn std:: error:: Error + ' static ) )
99+ impl core:: error:: Error for Error {
100+ fn source ( & self ) -> Option < & ( dyn core:: error:: Error + ' static ) > {
101+ #[ cfg( not( feature = "alloc" ) ) ]
102+ {
103+ None
104+ }
105+ #[ cfg( feature = "alloc" ) ]
106+ {
107+ self . source
108+ . as_ref ( )
109+ . map ( |source| source. as_ref ( ) as & ( dyn core:: error:: Error + ' static ) )
110+ }
106111 }
107112}
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