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Published: Jun 4, 2024 License: BSD-3-Clause Imports: 5 Imported by: 1,191



Package armor implements OpenPGP ASCII Armor, see RFC 4880. OpenPGP Armor is very similar to PEM except that it has an additional CRC checksum.

Deprecated: this package is unmaintained except for security fixes. New applications should consider a more focused, modern alternative to OpenPGP for their specific task. If you are required to interoperate with OpenPGP systems and need a maintained package, consider a community fork. See



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var ArmorCorrupt error = errors.StructuralError("armor invalid")


func Encode

func Encode(out io.Writer, blockType string, headers map[string]string) (w io.WriteCloser, err error)

Encode returns a WriteCloser which will encode the data written to it in OpenPGP armor.


type Block

type Block struct {
	Type   string            // The type, taken from the preamble (i.e. "PGP SIGNATURE").
	Header map[string]string // Optional headers.
	Body   io.Reader         // A Reader from which the contents can be read
	// contains filtered or unexported fields

A Block represents an OpenPGP armored structure.

The encoded form is:

-----BEGIN Type-----

base64-encoded Bytes
'=' base64 encoded checksum
-----END Type-----

where Headers is a possibly empty sequence of Key: Value lines.

Since the armored data can be very large, this package presents a streaming interface.

func Decode

func Decode(in io.Reader) (p *Block, err error)

Decode reads a PGP armored block from the given Reader. It will ignore leading garbage. If it doesn't find a block, it will return nil, io.EOF. The given Reader is not usable after calling this function: an arbitrary amount of data may have been read past the end of the block.

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