Crypto++  8.0
Free C++ class library of cryptographic schemes
base64.cpp
1 // base64.cpp - originally written and placed in the public domain by Wei Dai
2 
3 #include "pch.h"
4 #include "config.h"
5 #include "base64.h"
6 
7 NAMESPACE_BEGIN(CryptoPP)
8 ANONYMOUS_NAMESPACE_BEGIN
9 
10 const byte s_stdVec[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
11 const byte s_urlVec[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
12 const byte s_padding = '=';
13 const int s_stdArray[256] = {
14  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
15  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
16  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
17  52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
18  -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
19  15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
20  -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
21  41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1,
22  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
23  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
24  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
25  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
26  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
27  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
28  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
29  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1
30 };
31 const int s_urlArray[256] = {
32  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
33  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
34  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1,
35  52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
36  -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
37  15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, 63,
38  -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
39  41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1,
40  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
41  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
42  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
43  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
44  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
45  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
46  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
47  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1
48 };
49 
50 ANONYMOUS_NAMESPACE_END
51 
52 void Base64Encoder::IsolatedInitialize(const NameValuePairs &parameters)
53 {
54  bool insertLineBreaks = parameters.GetValueWithDefault(Name::InsertLineBreaks(), true);
55  int maxLineLength = parameters.GetIntValueWithDefault(Name::MaxLineLength(), 72);
56 
57  const char *lineBreak = insertLineBreaks ? "\n" : "";
58 
59  m_filter->Initialize(CombinedNameValuePairs(
60  parameters,
61  MakeParameters(Name::EncodingLookupArray(), &s_stdVec[0], false)
62  (Name::PaddingByte(), s_padding)
63  (Name::GroupSize(), insertLineBreaks ? maxLineLength : 0)
64  (Name::Separator(), ConstByteArrayParameter(lineBreak))
65  (Name::Terminator(), ConstByteArrayParameter(lineBreak))
66  (Name::Log2Base(), 6, true)));
67 }
68 
69 void Base64URLEncoder::IsolatedInitialize(const NameValuePairs &parameters)
70 {
71  bool insertLineBreaks = parameters.GetValueWithDefault(Name::InsertLineBreaks(), true);
72  int maxLineLength = parameters.GetIntValueWithDefault(Name::MaxLineLength(), 72);
73 
74  const char *lineBreak = insertLineBreaks ? "\n" : "";
75 
76  m_filter->Initialize(CombinedNameValuePairs(
77  parameters,
78  MakeParameters(Name::EncodingLookupArray(), &s_urlVec[0], false)
79  (Name::PaddingByte(), s_padding)
80  (Name::GroupSize(), insertLineBreaks ? maxLineLength : 0)
81  (Name::Separator(), ConstByteArrayParameter(lineBreak))
82  (Name::Terminator(), ConstByteArrayParameter(lineBreak))
83  (Name::Log2Base(), 6, true)));
84 }
85 
86 void Base64Decoder::IsolatedInitialize(const NameValuePairs &parameters)
87 {
88  BaseN_Decoder::IsolatedInitialize(CombinedNameValuePairs(
89  parameters,
90  MakeParameters(Name::DecodingLookupArray(), GetDecodingLookupArray(), false)(Name::Log2Base(), 6, true)));
91 }
92 
93 const int *Base64Decoder::GetDecodingLookupArray()
94 {
95  return s_stdArray;
96 }
97 
98 void Base64URLDecoder::IsolatedInitialize(const NameValuePairs &parameters)
99 {
100  BaseN_Decoder::IsolatedInitialize(CombinedNameValuePairs(
101  parameters,
102  MakeParameters(Name::DecodingLookupArray(), GetDecodingLookupArray(), false)(Name::Log2Base(), 6, true)));
103 }
104 
105 // Unrolled initialization, http://github.com/weidai11/cryptopp/issues/376
106 const int *Base64URLDecoder::GetDecodingLookupArray()
107 {
108  return s_urlArray;
109 }
110 
111 NAMESPACE_END
ConstByteArrayParameter
Used to pass byte array input as part of a NameValuePairs object.
Definition: algparam.h:20
NameValuePairs::GetIntValueWithDefault
int GetIntValueWithDefault(const char *name, int defaultValue) const
Get a named value with type int, with default.
Definition: cryptlib.h:395
Base64URLDecoder::IsolatedInitialize
void IsolatedInitialize(const NameValuePairs &parameters)
Initialize or reinitialize this object, without signal propagation.
Definition: base64.cpp:98
NameValuePairs::GetValueWithDefault
T GetValueWithDefault(const char *name, T defaultValue) const
Get a named value.
Definition: cryptlib.h:363
config.h
Library configuration file.
CombinedNameValuePairs
Combines two sets of NameValuePairs.
Definition: algparam.h:124
Name::PaddingByte
const char * PaddingByte()
byte
Definition: argnames.h:73
Name::Separator
const char * Separator()
ConstByteArrayParameter.
Definition: argnames.h:68
BaseN_Decoder::IsolatedInitialize
void IsolatedInitialize(const NameValuePairs &parameters)
Initialize or reinitialize this object, without signal propagation.
Definition: basecode.cpp:115
MakeParameters
AlgorithmParameters MakeParameters(const char *name, const T &value, bool throwIfNotUsed=true)
Create an object that implements NameValuePairs.
Definition: algparam.h:502
Name::EncodingLookupArray
const char * EncodingLookupArray()
const byte *
Definition: argnames.h:75
pch.h
Precompiled header file.
Name::Log2Base
const char * Log2Base()
int
Definition: argnames.h:74
Name::GroupSize
const char * GroupSize()
int
Definition: argnames.h:71
Name::Terminator
const char * Terminator()
ConstByteArrayParameter.
Definition: argnames.h:69
base64.h
Classes for the Base64Encoder, Base64Decoder, Base64URLEncoder and Base64URLDecoder.
Name::MaxLineLength
const char * MaxLineLength()
int
Definition: argnames.h:78
Base64URLEncoder::IsolatedInitialize
void IsolatedInitialize(const NameValuePairs &parameters)
Definition: base64.cpp:69
Name::DecodingLookupArray
const char * DecodingLookupArray()
const byte *
Definition: argnames.h:76
Base64Decoder::IsolatedInitialize
void IsolatedInitialize(const NameValuePairs &parameters)
Initialize or reinitialize this object, without signal propagation.
Definition: base64.cpp:86
CryptoPP
Crypto++ library namespace.
Name::InsertLineBreaks
const char * InsertLineBreaks()
bool
Definition: argnames.h:77
Base64Encoder::IsolatedInitialize
void IsolatedInitialize(const NameValuePairs &parameters)
Initialize or reinitialize this object, without signal propagation.
Definition: base64.cpp:52
NameValuePairs
Interface for retrieving values given their names.
Definition: cryptlib.h:293
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