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I am trying to use bouncy castle to read the content of CERT.RSA in an Android apk file. By using : openssl pkcs7 -inform DER -in CERT.RSA -noout -print_certs -text I am get the following, which seems correct : Certificate: Data: Version: 3 (0x2) Serial Number: 93:6e:ac:be:07:f2:01:df Signature Algorithm: sha1WithRSAEncryption Issuer: C=US, ST=California, L=Mountain View, O=Android, OU=Android, CN=Android/emailAddress=android@android.com Validity Not Before: Feb 29 01:33:46 2008 GMT Not After : Jul 17 01:33:46 2035 GMT Subject: C=US, ST=California, L=Mountain View, O=Android, OU=Android, CN=Android/emailAddress=android@android.com Subject Public Key Info: Public Key Algorithm: rsaEncryption Public-Key: (2048 bit) Modulus: 00:d6:93:19:04:de:c6:0b:24:b1:ed:c7:62:e0:d9: d8:25:3e:3e:cd:6c:eb:1d:e2:ff:06:8c:a8:e8:bc: a8:cd:6b:d3:78:6e:a7:0a:a7:6c:e6:0e:bb:0f:99: 35:59:ff:d9:3e:77:a9:43:e7:e8:3d:4b:64:b8:e4: fe:a2:d3:e6:56:f1:e2:67:a8:1b:bf:b2:30:b5:78: c2:04:43:be:4c:72:18:b8:46:f5:21:15:86:f0:38: a1:4e:89:c2:be:38:7f:8e:be:cf:8f:ca:c3:da:1e: e3:30:c9:ea:93:d0:a7:c3:dc:4a:f3:50:22:0d:50: 08:07:32:e0:80:97:17:ee:6a:05:33:59:e6:a6:94: ec:2c:b3:f2:84:a0:a4:66:c8:7a:94:d8:3b:31:09: 3a:67:37:2e:2f:64:12:c0:6e:6d:42:f1:58:18:df: fe:03:81:cc:0c:d4:44:da:6c:dd:c3:b8:24:58:19: 48:01:b3:25:64:13:4f:bf:de:98:c9:28:77:48:db: f5:67:6a:54:0d:81:54:c8:bb:ca:07:b9:e2:47:55: 33:11:c4:6b:9a:f7:6f:de:ec:cc:8e:69:e7:c8:a2: d0:8e:78:26:20:94:3f:99:72:7d:3c:04:fe:72:99: 1d:99:df:9b:ae:38:a0:b2:17:7f:a3:1d:5b:6a:fe: e9:1f Exponent: 3 (0x3) X509v3 extensions:

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