Created
January 8, 2014 01:14
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Decrypting an ASCII armored GPG encrypted string using a passphrase protected private key in ASCII armor format
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| package main | |
| import ( | |
| "bytes" | |
| "code.google.com/p/go.crypto/openpgp" | |
| "code.google.com/p/go.crypto/openpgp/armor" | |
| "fmt" | |
| "io/ioutil" | |
| "log" | |
| ) | |
| func main() { | |
| // Read armored private key into type EntityList | |
| // An EntityList contains one or more Entities. | |
| // This assumes there is only one Entity involved | |
| entitylist, err := openpgp.ReadArmoredKeyRing(bytes.NewBufferString(privateKey)) | |
| if err != nil { | |
| log.Fatal(err) | |
| } | |
| entity := entitylist[0] | |
| fmt.Println("Private key from armored string:", entity.Identities) | |
| // Decrypt private key using passphrase | |
| passphrase := []byte("golang") | |
| if entity.PrivateKey != nil && entity.PrivateKey.Encrypted { | |
| fmt.Println("Decrypting private key using passphrase") | |
| err := entity.PrivateKey.Decrypt(passphrase) | |
| if err != nil { | |
| fmt.Println("failed to decrypt key") | |
| } | |
| } | |
| for _, subkey := range entity.Subkeys { | |
| if subkey.PrivateKey != nil && subkey.PrivateKey.Encrypted { | |
| err := subkey.PrivateKey.Decrypt(passphrase) | |
| if err != nil { | |
| fmt.Println("failed to decrypt subkey") | |
| } | |
| } | |
| } | |
| // Decrypt armor encrypted message using decrypted private key | |
| decbuf := bytes.NewBuffer([]byte(encryptedMessage)) | |
| result, err := armor.Decode(decbuf) | |
| if err != nil { | |
| log.Fatal(err) | |
| } | |
| md, err := openpgp.ReadMessage(result.Body, entitylist, nil /* no prompt */, nil) | |
| if err != nil { | |
| fmt.Println("error reading message", err) | |
| } | |
| bytes, err := ioutil.ReadAll(md.UnverifiedBody) | |
| fmt.Println("md:", string(bytes)) | |
| } | |
| // pub 1024R/7F98BBCE 2014-01-04 | |
| // uid Golang Test (Private key password is 'golang') <[email protected]> | |
| // sub 1024R/5F34A320 2014-01-04 | |
| const privateKey = `-----BEGIN PGP PRIVATE KEY BLOCK----- | |
| Version: GnuPG v1 | |
| lQH+BFLHbYYBBADCjgKHmPmwBxI3c3DPVoSdu0+EJl/EsS2HEaN63dnLkGsMAs+4 | |
| 32wsywmMrzKqCL40sbhJVYBcfe0chL+cry4O54DX7+gA0ZSVzFUN2EGocnkaHzyS | |
| fuUtBdCTmoWZZAGFiBwlIS7aE/86SOyHksFo8LRC9W/GIWQS2PbcadvUywARAQAB | |
| /gMDApJxOwcsfChBYCCmhOAvotKdYcy7nuG7dyGDBlpclLJtH/PaakKSE33NtEj4 | |
| 1fyixQOdwApxvuQ2P0VX3pie/De1KpbeqXfnPLsmsXQwrRPOo38T5zeJ5ToWUGDC | |
| Oia69ep3kmHbAW41EBH/uk/nMM91QUdl4mkYsc3dhVOXbmf0xyRoP/Afqha4UhdZ | |
| 0XKlIZP1a5+3NF/Q6dAVG0+FlO5Hcai8n98jW0id8Yf6zI+1gFGvYYKhlifkdJeK | |
| Nf4YEvOXALEvaQqkcJOxEca+BmqsgCIFctJe9Bahx97Ep5hP7AH0aBmtZfmGmZwB | |
| GYoevUtKa4ASVmK8RaddBvIjcrWsoAsYMpDGYaE0fcdtxsBf3uT1Q8IMsT+ZRjjV | |
| TfvJ8aW14ZrLI98KdtXaOPZs91mML+3iw1c/1O/IEJfwxrUni2p/fDmCYU9eHR3u | |
| Q0PwVR0MCUHI1fGuUoetW2gYIxfklvBtEFWW1BD6fCpCtERHb2xhbmcgVGVzdCAo | |
| UHJpdmF0ZSBrZXkgcGFzc3dvcmQgaXMgJ2dvbGFuZycpIDxnb2xhbmd0ZXN0QHRl | |
| c3QuY29tPoi4BBMBAgAiBQJSx22GAhsDBgsJCAcDAgYVCAIJCgsEFgIDAQIeAQIX | |
| gAAKCRBVSiCHf5i7zqKJA/sFUM2TfL2VZKWC7E1N1wwZctB9Bf77SeAPSVpGCZ0c | |
| iUYIFdwwGowKtjoDrsbYgPp+UGOyYMD6tGzWKaJrQQoDyaQqVVRhbNXB7Jz7JT2a | |
| qKHD1t7cx5FfUzDMBNou3TOWHomDXyQGDAULAZnjaOj8/pDe6poxyBluSjMJUzfD | |
| pp0B/gRSx22GAQQArUMDqkGng9Cppk73UBWBd7jhhbtk0eaRQh/goUHhKJerZ4LM | |
| Q21IKyIX+GQbscDpccpXMI6eThXxrL+D8G4cNb4ewvT0zc20+T91ztgT9A/4Vifc | |
| EPQCErTqY/oZphAzZM1p6sRenc22e42iT0Iibd5gCs2wnSNeUzybDcuQi2EAEQEA | |
| Af4DAwKScTsHLHwoQWCYayWqio8purPTonYogZSN3QwaheS2Y0NE7skdLOvP97vi | |
| Rh7BktS6Dkgu0T3D39+q0O6ZO7XErvTVoas1F0HXzId4tiIicmx4tYNyWI4NrSO7 | |
| 6TQPz/bQe8ZN+plG5cgZowts6g6RSfQxoW21LrP8Lh+OEdcYwWf7BTukAYmD3oq9 | |
| RxdfYI7hnbVGFdOqQUQNcxZkbdrsF9ITjQb/KRln5/99E1Kp1D45VpPOs7NT3orA | |
| mnfSslJXVNm1uK6FDBX2iUe3JaAmgh+RLGXQXRZKJW4DGDTyYdwR4hO8cYix2+8z | |
| +XuwdVDPKBnzKn190m6xpdLyvKfj1BQhX14NShPQZ3QJiMU0k4Js23XSsWs9NSxI | |
| FjjE9/mOFVUH25KN+X7rzBPo2S0pMQLqyQxSLIdI2LPDxzlknctT6OoBPKPJjb7S | |
| Lt5GhIA5Cz+cohfX6LePG4FkvwU32tTRBz5YNhFBizmS+YifBBgBAgAJBQJSx22G | |
| AhsMAAoJEFVKIId/mLvOulED/2uUh/qjOT468XoK6Xt837w45JQPpLqiGH9KJgqF | |
| rUxJMw1bIE2G606OY6hCgeE+YC8qny29hQtXhKIquUI/0A1qK3aCZhwqyqT+QjvF | |
| 6Xi0i/HrgQwCyBopY3uGndMbvthxU0KO0d6seMZltHDr8YaU1JvDwNFDQVuw+Rqy | |
| 57ET | |
| =nvLl | |
| -----END PGP PRIVATE KEY BLOCK-----` | |
| // Encrypted by public key message for | |
| // 1024R/5F34A320 2014-01-04 "Golang Test (Private key password is 'golang') <[email protected]>" | |
| const encryptedMessage = `-----BEGIN PGP MESSAGE----- | |
| Version: GnuPG v1 | |
| hIwDBZMeL180oyABA/9DnQDx2QSk5k7f1JsqmK1kgoeEzBdNJ30DYlF0CBtHi5pQ | |
| yx0Y8EOaCXC7GLKyJXqTf+3KeVpXhC3YhVjHB4W5mDv9ifM91TRFyLm8OCmYLqV1 | |
| U9OANW6l3aQPG4FH/b/JnS74NCu2uEmWuBve8Qb808KSiDMclRHsAomV6XmNfdJh | |
| Af37lgu/6AFbgVMBmpfkPLtn2BYLitoeKh5IbF+Fzz5dk38Ij6P94nvPN3chaq8f | |
| /GsRWGttUkTsCE1YMZgPrr/uSGpxlNrdAY7KEhFHovLtsdJvMth5/n9IrDUVagwt | |
| nQ== | |
| =lNST | |
| -----END PGP MESSAGE-----` | |
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