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It depends on what you mean by "ASCII format". But generally you can do something like that: <pre><code>// Read the CSR FileReader fileReader = new FileReader("/path/to/your.csr"); PemReader pemReader = new PemReader(fileReader); PKCS10CertificationRequest csr = new PKCS10CertificationRequest(pemReader.readPemObject().getContent()); pemReader.close(); fileReader.close(); // Write the Public Key as a PEM-File StringWriter output = new StringWriter(); PemWriter pemWriter = new PemWriter(output); PemObject pkPemObject = new PemObject("PUBLIC KEY", csr.getSubjectPublicKeyInfo().getEncoded()); pemWriter.writeObject(pkPemObject); pemWriter.close(); System.out.println(output.getBuffer()); // Extract the Public Key as "RSAKeyParameters" so you can use for // encryption/signing operations. RSAKeyParameters pubkey = (RSAKeyParameters)PublicKeyFactory.createKey(csr.getSubjectPublicKeyInfo()); </code></pre> This is what you'll get: <pre><code>-----BEGIN PUBLIC KEY----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAxlRixVjOXAmUQ2zORREO VSQDQejyjWzT3bDznPltiPMwM3SOmPmZyrB8jF3iFvzdFge1QG2WdDj7PzmysXNL /1xRa0efWv8nURx1eV86hvU6ThNqY3WPyYYXSjTcN74uhGSJo7d5zG6JSL4Cj+l4 RO+nh/5Pa8438ufS+9hXndKPFT2aub9roKysxWpsctpNoOIjfyxkLv9Z9sqxuggG nwYkwYmoDjPAQp2gRpCp7Hw5F6jSkA33NR5S/aPdyvzKZDbuoRdAl2sTubL1TLG3 nC6tetGsmFRRkNiJjPSNtbXXtN6RB2eJL0epyaFFLksFBaL6nvYIgB1uqFroUY15 2QIDAQAB -----END PUBLIC KEY----- </code></pre> I have tested this with the latest version of the BC-provider. You need both the "provider" and the "PKIX/PKCS..." jar (otherwise you have to deal with deprecated API-calls).
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