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Path	Synopsis
archive
tar The tar package implements access to tar archives.	The tar package implements access to tar archives.
zip The zip package provides support for reading ZIP archives.	The zip package provides support for reading ZIP archives.
asn1 The asn1 package implements parsing of DER-encoded ASN.1 data structures, as defined in ITU-T Rec X.690.	The asn1 package implements parsing of DER-encoded ASN.1 data structures, as defined in ITU-T Rec X.690.
big This package implements multi-precision arithmetic (big numbers).	This package implements multi-precision arithmetic (big numbers).
bufio This package implements buffered I/O. It wraps an io.Reader or io.Writer object, creating another object (Reader or Writer) that also implements the interface but provides buffering and some help for textual I/O.	This package implements buffered I/O. It wraps an io.Reader or io.Writer object, creating another object (Reader or Writer) that also implements the interface but provides buffering and some help for textual I/O.
bytes The bytes package implements functions for the manipulation of byte slices.	The bytes package implements functions for the manipulation of byte slices.
cmath The cmath package provides basic constants and mathematical functions for complex numbers.	The cmath package provides basic constants and mathematical functions for complex numbers.
compress
flate The flate package implements the DEFLATE compressed data format, described in RFC 1951.	The flate package implements the DEFLATE compressed data format, described in RFC 1951.
gzip The gzip package implements reading and writing of gzip format compressed files, as specified in RFC 1952.	The gzip package implements reading and writing of gzip format compressed files, as specified in RFC 1952.
zlib The zlib package implements reading and writing of zlib format compressed data, as specified in RFC 1950.	The zlib package implements reading and writing of zlib format compressed data, as specified in RFC 1950.
container
heap This package provides heap operations for any type that implements heap.Interface.	This package provides heap operations for any type that implements heap.Interface.
list The list package implements a doubly linked list.	The list package implements a doubly linked list.
ring The ring package implements operations on circular lists.	The ring package implements operations on circular lists.
vector The vector package implements containers for managing sequences of elements.	The vector package implements containers for managing sequences of elements.
crypto
aes This package implements AES encryption (formerly Rijndael), as defined in U.S. Federal Information Processing Standards Publication 197.	This package implements AES encryption (formerly Rijndael), as defined in U.S. Federal Information Processing Standards Publication 197.
block The block package implements standard block cipher modes that can be wrapped around low-level block cipher implementations.	The block package implements standard block cipher modes that can be wrapped around low-level block cipher implementations.
blowfish This package implements Bruce Schneier's Blowfish encryption algorithm.	This package implements Bruce Schneier's Blowfish encryption algorithm.
hmac The hmac package implements the Keyed-Hash Message Authentication Code (HMAC) as defined in U.S. Federal Information Processing Standards Publication 198.	The hmac package implements the Keyed-Hash Message Authentication Code (HMAC) as defined in U.S. Federal Information Processing Standards Publication 198.
md4 This package implements the MD4 hash algorithm as defined in RFC 1320.	This package implements the MD4 hash algorithm as defined in RFC 1320.
md5 This package implements the MD5 hash algorithm as defined in RFC 1321.	This package implements the MD5 hash algorithm as defined in RFC 1321.
ocsp This package parses OCSP responses as specified in RFC 2560.	This package parses OCSP responses as specified in RFC 2560.
rand Package rand implements a cryptographically secure pseudorandom number generator.	Package rand implements a cryptographically secure pseudorandom number generator.
rc4 This package implements RC4 encryption, as defined in Bruce Schneier's Applied Cryptography.	This package implements RC4 encryption, as defined in Bruce Schneier's Applied Cryptography.
ripemd160 This package implements the RIPEMD-160 hash algorithm.	This package implements the RIPEMD-160 hash algorithm.
rsa This package implements RSA encryption as specified in PKCS#1.	This package implements RSA encryption as specified in PKCS#1.
sha1 This package implements the SHA1 hash algorithm as defined in RFC 3174.	This package implements the SHA1 hash algorithm as defined in RFC 3174.
sha256 This package implements the SHA224 and SHA256 hash algorithms as defined in FIPS 180-2.	This package implements the SHA224 and SHA256 hash algorithms as defined in FIPS 180-2.
sha512 This package implements the SHA384 and SHA512 hash algorithms as defined in FIPS 180-2.	This package implements the SHA384 and SHA512 hash algorithms as defined in FIPS 180-2.
subtle This package implements functions that are often useful in cryptographic code but require careful thought to use correctly.	This package implements functions that are often useful in cryptographic code but require careful thought to use correctly.
x509 This package parses X.509-encoded keys and certificates.	This package parses X.509-encoded keys and certificates.
xtea This package implements XTEA encryption, as defined in Needham and Wheeler's 1997 technical report, "Tea extensions."	This package implements XTEA encryption, as defined in Needham and Wheeler's 1997 technical report, "Tea extensions."
debug
dwarf This package provides access to DWARF debugging information loaded from executable files, as defined in the DWARF 2.0 Standard at http://dwarfstd.org/doc/dwarf-2.0.0.pdf	This package provides access to DWARF debugging information loaded from executable files, as defined in the DWARF 2.0 Standard at http://dwarfstd.org/doc/dwarf-2.0.0.pdf
elf Package elf implements access to ELF object files.	Package elf implements access to ELF object files.
gosym Package gosym implements access to the Go symbol and line number tables embedded in Go binaries generated by the gc compilers.	Package gosym implements access to the Go symbol and line number tables embedded in Go binaries generated by the gc compilers.
macho Package macho implements access to Mach-O object files, as defined by http://developer.apple.com/mac/library/documentation/DeveloperTools/Conceptual/MachORuntime/Reference/reference.html.	Package macho implements access to Mach-O object files, as defined by http://developer.apple.com/mac/library/documentation/DeveloperTools/Conceptual/MachORuntime/Reference/reference.html.
proc Package proc provides a platform-independent interface for tracing and controlling running processes.	Package proc provides a platform-independent interface for tracing and controlling running processes.
ebnf A library for EBNF grammars.	A library for EBNF grammars.
encoding
ascii85 Package ascii85 implements the ascii85 data encoding as used in the btoa tool and Adobe's PostScript and PDF document formats.	Package ascii85 implements the ascii85 data encoding as used in the btoa tool and Adobe's PostScript and PDF document formats.
base64 Package base64 implements base64 encoding as specified by RFC 4648.	Package base64 implements base64 encoding as specified by RFC 4648.
binary This package implements translation between unsigned integer values and byte sequences.	This package implements translation between unsigned integer values and byte sequences.
git85 Package git85 implements the radix 85 data encoding used in the Git version control system.	Package git85 implements the radix 85 data encoding used in the Git version control system.
hex This package implements hexadecimal encoding and decoding.	This package implements hexadecimal encoding and decoding.
pem This package implements the PEM data encoding, which originated in Privacy Enhanced Mail.	This package implements the PEM data encoding, which originated in Privacy Enhanced Mail.
exec The exec package runs external commands.	The exec package runs external commands.
exp
datafmt The datafmt package implements syntax-directed, type-driven formatting of arbitrary data structures.	The datafmt package implements syntax-directed, type-driven formatting of arbitrary data structures.
draw Package draw provides basic graphics and drawing primitives, in the style of the Plan 9 graphics library (see http://plan9.bell-labs.com/magic/man2html/2/draw) and the X Render extension.	Package draw provides basic graphics and drawing primitives, in the style of the Plan 9 graphics library (see http://plan9.bell-labs.com/magic/man2html/2/draw) and the X Render extension.
expvar The expvar package provides a standardized interface to public variables, such as operation counters in servers.	The expvar package provides a standardized interface to public variables, such as operation counters in servers.
flag The flag package implements command-line flag parsing.	The flag package implements command-line flag parsing.
go
ast The AST package declares the types used to represent syntax trees for Go packages.	The AST package declares the types used to represent syntax trees for Go packages.
doc The doc package extracts source code documentation from a Go AST.	The doc package extracts source code documentation from a Go AST.
parser A parser for Go source files.	A parser for Go source files.
printer The printer package implements printing of AST nodes.	The printer package implements printing of AST nodes.
scanner A scanner for Go source text.	A scanner for Go source text.
token This package defines constants representing the lexical tokens of the Go programming language and basic operations on tokens (printing, predicates).	This package defines constants representing the lexical tokens of the Go programming language and basic operations on tokens (printing, predicates).
typechecker This package implements typechecking of a Go AST.	This package implements typechecking of a Go AST.
hash
adler32 This package implements the Adler-32 checksum.	This package implements the Adler-32 checksum.
crc32 This package implements the 32-bit cyclic redundancy check, or CRC-32, checksum.	This package implements the 32-bit cyclic redundancy check, or CRC-32, checksum.
crc64 This package implements the 64-bit cyclic redundancy check, or CRC-64, checksum.	This package implements the 64-bit cyclic redundancy check, or CRC-64, checksum.
html The html package implements an HTML5-compliant tokenizer and parser.	The html package implements an HTML5-compliant tokenizer and parser.
http
pprof Package pprof serves via its HTTP server runtime profiling data in the format expected by the pprof visualization tool.	Package pprof serves via its HTTP server runtime profiling data in the format expected by the pprof visualization tool.
image The image package implements a basic 2-D image library.	The image package implements a basic 2-D image library.
jpeg The jpeg package implements a decoder for JPEG images, as defined in ITU-T T.81.	The jpeg package implements a decoder for JPEG images, as defined in ITU-T T.81.
png The png package implements a PNG image decoder and encoder.	The png package implements a PNG image decoder and encoder.
index
suffixarray The suffixarray package implements substring search in logarithmic time using an in-memory suffix array.	The suffixarray package implements substring search in logarithmic time using an in-memory suffix array.
io This package provides basic interfaces to I/O primitives.	This package provides basic interfaces to I/O primitives.
ioutil
json The json package implements encoding and decoding of JSON objects as defined in RFC 4627.	The json package implements encoding and decoding of JSON objects as defined in RFC 4627.
log Simple logging package.	Simple logging package.
math The math package provides basic constants and mathematical functions.	The math package provides basic constants and mathematical functions.
mime The mime package implements parts of the MIME spec.	The mime package implements parts of the MIME spec.
multipart Package multipart implements MIME multipart parsing, as defined in RFC 2046.	Package multipart implements MIME multipart parsing, as defined in RFC 2046.
net
dict Package dict implements the Dictionary Server Protocol as defined in RFC 2229.	Package dict implements the Dictionary Server Protocol as defined in RFC 2229.
textproto The textproto package implements generic support for text-based request/response protocols in the style of HTTP, NNTP, and SMTP.	The textproto package implements generic support for text-based request/response protocols in the style of HTTP, NNTP, and SMTP.
nntp The nntp package implements a client for the news protocol NNTP, as defined in RFC 3977.	The nntp package implements a client for the news protocol NNTP, as defined in RFC 3977.
os The os package provides a platform-independent interface to operating system functionality.	The os package provides a platform-independent interface to operating system functionality.
signal Package signal implements operating system-independent signal handling.	Package signal implements operating system-independent signal handling.
patch Package patch implements parsing and execution of the textual and binary patch descriptions used by version control tools such as CVS, Git, Mercurial, and Subversion.	Package patch implements parsing and execution of the textual and binary patch descriptions used by version control tools such as CVS, Git, Mercurial, and Subversion.
path The path package implements utility routines for manipulating slash-separated filename paths.	The path package implements utility routines for manipulating slash-separated filename paths.
rand Package rand implements pseudo-random number generators.	Package rand implements pseudo-random number generators.
reflect The reflect package implements run-time reflection, allowing a program to manipulate objects with arbitrary types.	The reflect package implements run-time reflection, allowing a program to manipulate objects with arbitrary types.
regexp Package regexp implements a simple regular expression library.	Package regexp implements a simple regular expression library.
rpc
jsonrpc Package jsonrpc implements a JSON-RPC ClientCodec and ServerCodec for the rpc package.	Package jsonrpc implements a JSON-RPC ClientCodec and ServerCodec for the rpc package.
runtime The runtime package contains operations that interact with Go's runtime system, such as functions to control goroutines.	The runtime package contains operations that interact with Go's runtime system, such as functions to control goroutines.
pprof Package pprof writes runtime profiling data in the format expected by the pprof visualization tool.	Package pprof writes runtime profiling data in the format expected by the pprof visualization tool.
tiny
scanner A scanner and tokenizer for UTF-8-encoded text.	A scanner and tokenizer for UTF-8-encoded text.
smtp Package smtp implements the Simple Mail Transfer Protocol as defined in RFC 5321.	Package smtp implements the Simple Mail Transfer Protocol as defined in RFC 5321.
sort The sort package provides primitives for sorting arrays and user-defined collections.	The sort package provides primitives for sorting arrays and user-defined collections.
strconv The strconv package implements conversions to and from string representations of basic data types.	The strconv package implements conversions to and from string representations of basic data types.
strings A package of simple functions to manipulate strings.	A package of simple functions to manipulate strings.
sync The sync package provides basic synchronization primitives such as mutual exclusion locks.	The sync package provides basic synchronization primitives such as mutual exclusion locks.
syscall This package contains an interface to the low-level operating system primitives.	This package contains an interface to the low-level operating system primitives.
syslog The syslog package provides a simple interface to the system log service.	The syslog package provides a simple interface to the system log service.
tabwriter The tabwriter package implements a write filter (tabwriter.Writer) that translates tabbed columns in input into properly aligned text.	The tabwriter package implements a write filter (tabwriter.Writer) that translates tabbed columns in input into properly aligned text.
template Data-driven templates for generating textual output such as HTML.	Data-driven templates for generating textual output such as HTML.
testing The testing package provides support for automated testing of Go packages.	The testing package provides support for automated testing of Go packages.
iotest The iotest package implements Readers and Writers useful only for testing.	The iotest package implements Readers and Writers useful only for testing.
quick This package implements utility functions to help with black box testing.	This package implements utility functions to help with black box testing.
script This package aids in the testing of code that uses channels.	This package aids in the testing of code that uses channels.
time The time package provides functionality for measuring and displaying time.	The time package provides functionality for measuring and displaying time.
try Package try contains the executable part of the gotry command.	Package try contains the executable part of the gotry command.
unsafe The unsafe package contains operations that step around the type safety of Go programs.	The unsafe package contains operations that step around the type safety of Go programs.
utf16 Package utf16 implements encoding and decoding of UTF-16 sequences.	Package utf16 implements encoding and decoding of UTF-16 sequences.
utf8 Functions and constants to support text encoded in UTF-8.	Functions and constants to support text encoded in UTF-8.
websocket The websocket package implements a client and server for the Web Socket protocol.	The websocket package implements a client and server for the Web Socket protocol.
xml Package xml implements a simple XML 1.0 parser that understands XML name spaces.	Package xml implements a simple XML 1.0 parser that understands XML name spaces.