Package md5 implements the MD5 hash algorithm as defined in RFC 1321.

Package rsa implements RSA encryption as specified in PKCS#1.

Package sha1 implements the SHA1 hash algorithm as defined in RFC 3174.

Package sha256 implements the SHA224 and SHA256 hash algorithms as defined in FIPS 180-4.

Package sha512 implements the SHA-384, SHA-512, SHA-512/224, and SHA-512/256 hash algorithms as defined in FIPS 180-4.

Package tls partially implements TLS 1.2, as specified in RFC 5246.