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copied!<p>It's often beneficial to look at an existing implementation and see what they do. OpenSSL/LibreSSL defines these BEGIN and END markers in <a href="https://github.com/libressl-portable/openbsd/blob/f1f451b425d50055598d59872e766f47588b8e31/src/lib/libcrypto/pem/pem.h#L115-L139" rel="nofollow noreferrer">crypto/pem/pem.h</a>. For example, the current LibreSSL has the following:</p> <pre><code>#define PEM_STRING_X509_OLD "X509 CERTIFICATE" #define PEM_STRING_X509 "CERTIFICATE" #define PEM_STRING_X509_PAIR "CERTIFICATE PAIR" #define PEM_STRING_X509_TRUSTED "TRUSTED CERTIFICATE" #define PEM_STRING_X509_REQ_OLD "NEW CERTIFICATE REQUEST" #define PEM_STRING_X509_REQ "CERTIFICATE REQUEST" #define PEM_STRING_X509_CRL "X509 CRL" #define PEM_STRING_EVP_PKEY "ANY PRIVATE KEY" #define PEM_STRING_PUBLIC "PUBLIC KEY" #define PEM_STRING_RSA "RSA PRIVATE KEY" #define PEM_STRING_RSA_PUBLIC "RSA PUBLIC KEY" #define PEM_STRING_DSA "DSA PRIVATE KEY" #define PEM_STRING_DSA_PUBLIC "DSA PUBLIC KEY" #define PEM_STRING_PKCS7 "PKCS7" #define PEM_STRING_PKCS7_SIGNED "PKCS #7 SIGNED DATA" #define PEM_STRING_PKCS8 "ENCRYPTED PRIVATE KEY" #define PEM_STRING_PKCS8INF "PRIVATE KEY" #define PEM_STRING_DHPARAMS "DH PARAMETERS" #define PEM_STRING_SSL_SESSION "SSL SESSION PARAMETERS" #define PEM_STRING_DSAPARAMS "DSA PARAMETERS" #define PEM_STRING_ECDSA_PUBLIC "ECDSA PUBLIC KEY" #define PEM_STRING_ECPARAMETERS "EC PARAMETERS" #define PEM_STRING_ECPRIVATEKEY "EC PRIVATE KEY" #define PEM_STRING_PARAMETERS "PARAMETERS" #define PEM_STRING_CMS "CMS" </code></pre> <p>And as far as I know, there is no master list of BEGIN/END markers. They're pretty much defined on an as-needed basis by an implementation. And then if you want to inter-op with that implementation, you add the string to your own.</p>

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