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CRYPTO(3)		 BSD Library Functions Manual		     CRYPTO(3)

     crypto -- OpenSSL cryptographic library

     The OpenSSL crypto	library	implements a wide range	of cryptographic algo-
     rithms used in various Internet standards.	 The services provided by this
     library are used by the OpenSSL implementations of	TLS and	S/MIME,	and
     they have also been used to implement SSH,	OpenPGP, and other crypto-
     graphic standards.

     Symmetric ciphers including AES, Blowfish,	CAST, Chacha20,	IDEA, DES,
     RC2, and RC4 are provided by the generic interface	EVP_EncryptInit(3).
     Low-level stand-alone interfaces include AES_encrypt(3), BF_set_key(3),
     ChaCha(3),	DES_set_key(3),	and RC4(3).

     Public key	cryptography and key agreement are provided by DH_new(3),
     ECDH_compute_key(3), X25519(3), DSA_new(3), ECDSA_SIG_new(3), RSA_new(3),
     and EVP_PKEY_new(3).

     Certificates are handled by X509_new(3) and X509v3_add_ext(3).

     Authentication codes and hash functions offered include
     EVP_DigestInit(3),	CMAC_Init(3), HMAC(3), MD4(3), MD5(3), RIPEMD160(3),
     SHA1(3), and SHA256(3).

     Input, output, and	data encoding facilities include ASN1_TYPE_get(3),
     BIO_new(3), CMS_ContentInfo_new(3), evp(3), EVP_EncodeInit(3),
     PEM_read(3), PKCS7_encrypt(3), PKCS7_sign(3), PKCS12_create(3), and

     Auxiliary features	include:
     -	 configuration file handling: see OPENSSL_config(3)
     -	 error reporting: see ERR(3)
     -	 OCSP_REQUEST_new(3)
     -	 UI_new(3)

     Internal utilities	include	BIO_f_buffer(3), BN_new(3), EC_GROUP_new(3),
     lh_new(3),	and STACK_OF(3).

     Some of the newer functions follow	a naming convention using the numbers
     `0' and `1'.  For example consider	the names of these functions:

     int X509_CRL_add0_revoked(X509_CRL	*crl, X509_REVOKED *rev)
     int X509_add1_trust_object(X509 *x, ASN1_OBJECT *obj)

     The `0' version uses the supplied structure pointer directly in the par-
     ent and it	will be	freed up when the parent is freed.  In the above exam-
     ple crl would be freed but	rev would not.

     The `1' function uses a copy of the supplied structure pointer (or	in
     some cases	increases its link count) in the parent	and so both (x and obj
     above) should be freed up.

     openssl(1), ssl(3)

BSD				 June 24, 2020				   BSD


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