Verifica la firma digitale usando php

Ho un'e-mail che è firmata digitalmente.

e-mail :

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 The below email has been digitally signed for test purposes. We will now go on and save this signed email in our dms system. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (MingW32) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEcBAEBAgAGBQJTnwd9AAoJEEWjhuB1kNr9dQcH/2YeZlHEfK/KOPg8XhpOY+4l 3camfFVya8JIzLHsOzhhdSqIItDr7VlGDrjrMgPPiD1abyy9zhcqZ18Kh8sUuFJV /TA434rrnMJC0xmSzXl4uo+UagyNyCjzwR4TFCGP4Ob6SzPl/jxfrcfO5yXEdF1I X6wgQUmnb3ZLczdPVXsKpwpVIGqX7diwe1CAZKxCmjZo9rr/MmDLLl7AjYq/WQDT uOYqXs2IasOIiTGpYrqexBpDn1qRUNiKVgFSRUTfTjYGXYij9P635WTfeE1bQrn1 HpT9hKhipYPkFcELAor7asqAcnE0lc4Oy9NV2bUryss8ic/pkhiXvlohA3MpCDA= =+IbK -----END PGP SIGNATURE----- 

Chiave pubblica:

 -----BEGIN PGP PUBLIC KEY BLOCK----- Version: GnuPG v2.0.22 (MingW32) mQENBFOfBmkBCAC6gH9rR185hiCADttaQeUp9Jc+4Zzx60E+ogWd33Tb1dNvK/IK wqpnRpYI1CHVpqX0xWy8Ylcw3rLpPJ6BUzO3hWFLRMXAIXiemV/+VKrKysgm1Xdg 1PSAVfqmgkXLEEGGSj2OHNA0VVnl1G8AI8/SMpLqhS3PMz3X1nmBv4hLohugLla9 AVdYp6Me5OAWfjHswkUxCvc/fSh2ufFSnFxgjUibIyn+GP5qG8Wc+GjrBzTLzjA7 LvP198fWIHQ5w342F3WE8/9ec+1ir/a4japcFodRibXBEqltF+BXgk9pVcEXTd8O FCxygrnSkWioj9Qf5uyjuKfV1F7Wq/Nu5uPZABEBAAG0JkFiaGluYXYgQWdnYXJ3 YWwgPGFiaGluYXZAdHJ1dGVjaC5vcmc+iQE/BBMBAgApBQJTnwZpAhsjBQkJZgGA BwsJCAcDAgEGFQgCCQoLBBYCAwECHgECF4AACgkQRaOG4HWQ2v2F9Af/RAKCz0uo xqrVe1MXqCe9ZCPSwlHGH4X4NtQbo7FTYy7K2fo9ucoKI4c2lHZA+Ef1K6BhZG34 IlXPSwy8nhTWJl7pi/xo7gEDlnHJMJCGvQcdtm4lkp39V2cy/Y0lS9V/EYmiesIX tmPwwyYxo85jNsdmbjQKDTv5mcir9AebllCk2NlrxpyTO8oAnp1peHaHHq+U92e3 ZipHEiuAvE0U6WU/fA7tHoWoUor9AUm1hE5mSsyi+do4o/YJqGEgAss62v0npcBx oyHoHum5XUgZ1kjvq40Mzkxo9N6vU7P7ULyt9FZylM+pk9XEqiz8IGTPW6JGiJS2 WmhJli2Szl1xgLkBDQRTnwZpAQgA27UvNu/m61pZwTBSQAVjLNJnJTlU4yh/DxKU B3opw7JvvgXYB3VS9AyqSYaIJTcziCBZRewMH+WVpZwRk9SFMyeyNhuk9SGeGU9s vyE5dGPa/U5zpvhaqn//CMdRr+wf6XeBKjzc9eKgWMrPLhzlHZ6kzLsbRsalOd4x 0M3aeO4SV00HFFfXVfJplNB8/zsHNNqtF5ACz9DX69p1GWJD6AAlu/s04xkkUScr M2B5lHm6iU6NmfP1GeTD+rOyigcOrSlAL4QGIzGDfoDJOy9UYtk+YOv8UBa3IpG0 7sARkd+MZGUOgPWIDYQLiSi+9opFHtn4EzrvuUP3Zj1kN4ZUTwARAQABiQElBBgB AgAPBQJTnwZpAhsMBQkJZgGAAAoJEEWjhuB1kNr9kHoIAKnjEAiH53ZrWYuummPR PRztZL1K7LkxEAxQ00V+PMrg4wNlp1WW5Vl3X0jB5FqUTUmI/65MhoWa+Ucqg31c pUOpw5OHK/cyrsscj+gL3nknhswWcvqBNQuiB8UO7Kt89yFYysA754sADKE+nDBM D+kmlH4u3vvKep0hZ+gzvH3AOZDhijKJYN9zMMf/gtwZhlEm/N+yBpkP1sxcFsJ+ V5hduu4sqJnAcCWg3V/JXonAOZGPS/GE+wXt4Om1D/6RcBBtrBGwh/ezBFS/gSio vGRcFzZYRhM1rMEu82raZ3ji3X/5fOjxvhSXdrajG3LX8s2gCk+a0nGDi3MYs5l0 p14= =cn4r -----END PGP PUBLIC KEY BLOCK----- 

Voglio scrivere un programma in php che verificherà la firma digitale. Ho la chiave pubblica del mittente. Ho provato a scaricare la libreria GnuPG da questo sito , ma non viene scaricato.

C'è un altro modo? Come dovrei farlo? Qualsiasi aiuto sarà apprezzato.

PHP ha già un module per interfacere GnuPG , che è abbastanza facile da usare.

GnuPG deve essere già installato, sui server Linux che di solito è, su macchine Windows ho sentito parlare di get PHP in esecuzione con GnuPG piuttosto difficile.

Per verificare le firme , utilizzare gnupg_verify(...) , esempio dalla documentazione PHP collegata:

 <?php $plaintext = ""; $gpg = new gnupg(); // clearsigned $info = $gpg -> verify($signed_text,false,$plaintext); print_r($info); // detached signature $info = $gpg -> verify($signed_text,$signature); print_r($info); ?> 

Dovrai importre la chiave pubblica del firmatario prima di verificare, se non già fatto.