NAME

       PKCS5_PBE_keyivgen, PKCS5_PBE_keyivgen_ex, PKCS5_pbe2_set, PKCS5_pbe2_set_iv,
       PKCS5_pbe2_set_iv_ex, PKCS5_pbe_set, PKCS5_pbe_set_ex, PKCS5_pbe2_set_scrypt,
       PKCS5_pbe_set0_algor, PKCS5_pbe_set0_algor_ex, PKCS5_v2_PBE_keyivgen,
       PKCS5_v2_PBE_keyivgen_ex, PKCS5_v2_scrypt_keyivgen, PKCS5_v2_scrypt_keyivgen_ex,
       PKCS5_pbkdf2_set, PKCS5_pbkdf2_set_ex, EVP_PBE_scrypt, EVP_PBE_scrypt_ex - PKCS#5 Password
       based encryption routines

SYNOPSIS

        #include <openssl/evp.h>

        int PKCS5_PBE_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass, int passlen,
                               ASN1_TYPE *param, const EVP_CIPHER *cipher,
                               const EVP_MD *md, int en_de);
        int PKCS5_PBE_keyivgen_ex(EVP_CIPHER_CTX *cctx, const char *pass, int passlen,
                                  ASN1_TYPE *param, const EVP_CIPHER *cipher,
                                  const EVP_MD *md, int en_de, OSSL_LIB_CTX *libctx,
                                  const char *propq);
        int PKCS5_v2_PBE_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass, int passlen,
                                  ASN1_TYPE *param, const EVP_CIPHER *cipher,
                                  const EVP_MD *md, int en_de);
        int PKCS5_v2_PBE_keyivgen_ex(EVP_CIPHER_CTX *ctx, const char *pass, int passlen,
                                     ASN1_TYPE *param, const EVP_CIPHER *cipher,
                                     const EVP_MD *md, int en_de,
                                     OSSL_LIB_CTX *libctx, const char *propq);
        int EVP_PBE_scrypt(const char *pass, size_t passlen,
                           const unsigned char *salt, size_t saltlen,
                           uint64_t N, uint64_t r, uint64_t p, uint64_t maxmem,
                           unsigned char *key, size_t keylen);
        int EVP_PBE_scrypt_ex(const char *pass, size_t passlen,
                              const unsigned char *salt, size_t saltlen,
                              uint64_t N, uint64_t r, uint64_t p, uint64_t maxmem,
                              unsigned char *key, size_t keylen,
                              OSSL_LIB_CTX *ctx, const char *propq);
        int PKCS5_v2_scrypt_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass,
                                     int passlen, ASN1_TYPE *param,
                                     const EVP_CIPHER *c, const EVP_MD *md, int en_de);
        int PKCS5_v2_scrypt_keyivgen_ex(EVP_CIPHER_CTX *ctx, const char *pass,
                                        int passlen, ASN1_TYPE *param,
                                        const EVP_CIPHER *c, const EVP_MD *md, int en_de,
                                        OSSL_LIB_CTX *libctx, const char *propq);

        #include <openssl/x509.h>

        int PKCS5_pbe_set0_algor(X509_ALGOR *algor, int alg, int iter,
                                 const unsigned char *salt, int saltlen);
        int PKCS5_pbe_set0_algor_ex(X509_ALGOR *algor, int alg, int iter,
                                    const unsigned char *salt, int saltlen,
                                    OSSL_LIB_CTX *libctx);

        X509_ALGOR *PKCS5_pbe_set(int alg, int iter,
                                  const unsigned char *salt, int saltlen);
        X509_ALGOR *PKCS5_pbe_set_ex(int alg, int iter,
                                     const unsigned char *salt, int saltlen,
                                     OSSL_LIB_CTX *libctx);

        X509_ALGOR *PKCS5_pbe2_set(const EVP_CIPHER *cipher, int iter,
                                   unsigned char *salt, int saltlen);
        X509_ALGOR *PKCS5_pbe2_set_iv(const EVP_CIPHER *cipher, int iter,
                                      unsigned char *salt, int saltlen,
                                      unsigned char *aiv, int prf_nid);
        X509_ALGOR *PKCS5_pbe2_set_iv_ex(const EVP_CIPHER *cipher, int iter,
                                         unsigned char *salt, int saltlen,
                                         unsigned char *aiv, int prf_nid,
                                         OSSL_LIB_CTX *libctx);
        X509_ALGOR *PKCS5_pbe2_set_scrypt(const EVP_CIPHER *cipher,
                                          const unsigned char *salt, int saltlen,
                                          unsigned char *aiv, uint64_t N, uint64_t r,
                                          uint64_t p);

        X509_ALGOR *PKCS5_pbkdf2_set(int iter, unsigned char *salt, int saltlen,
                                     int prf_nid, int keylen);
        X509_ALGOR *PKCS5_pbkdf2_set_ex(int iter, unsigned char *salt, int saltlen,
                                        int prf_nid, int keylen,
                                        OSSL_LIB_CTX *libctx);

DESCRIPTION

   Key Derivation
       PKCS5_PBE_keyivgen() and PKCS5_PBE_keyivgen_ex() take a password pass of length passlen,
       parameters param and a message digest function md_type and performs a key derivation
       according to PKCS#5 PBES1. The resulting key is then used to initialise the cipher context
       ctx with a cipher cipher for encryption (en_de=1) or decryption (en_de=0).

       pass is an optional parameter and can be NULL. If passlen is -1, then the function will
       calculate the length of pass using strlen().

       PKCS5_v2_PBE_keyivgen() and PKCS5_v2_PBE_keyivgen_ex() are similar to the above but
       instead use PKCS#5 PBES2 as the encryption algorithm using the supplied parameters.

       PKCS5_v2_scrypt_keyivgen() and PKCS5_v2_scrypt_keyivgen_ex() use SCRYPT as the key
       derivation part of the encryption algorithm.

       salt is the salt used in the derivation of length saltlen. If the salt is NULL, then
       saltlen must be 0. The function will not attempt to calculate the length of the salt
       because it is not assumed to be NULL terminated.

       iter is the iteration count and its value should be greater than or equal to 1. RFC 2898
       suggests an iteration count of at least 1000. Any iter less than 1 is treated as a single
       iteration.

       digest is the message digest function used in the derivation.

       Functions ending in _ex() take optional parameters libctx and propq which are used to
       select appropriate algorithm implementations.

   Algorithm Identifier Creation
       PKCS5_pbe_set(), PKCS5_pbe_set_ex(), PKCS5_pbe2_set(), PKCS5_pbe2_set_iv(),
       PKCS5_pbe2_set_iv_ex() and PKCS5_pbe2_set_scrypt() generate an X509_ALGOR object which
       represents an AlgorithmIdentifier containing the algorithm OID and associated parameters
       for the PBE algorithm.

       PKCS5_pbkdf2_set() and PKCS5_pbkdf2_set_ex() generate an X509_ALGOR object which
       represents an AlgorithmIdentifier containing the algorithm OID and associated parameters
       for the PBKDF2 algorithm.

       PKCS5_pbe_set0_algor() and PKCS5_pbe_set0_algor_ex() set the PBE algorithm OID and
       parameters into the supplied X509_ALGOR.

NOTES

       The *_keyivgen() functions are typically used in PKCS#12 to encrypt objects.

       These functions make no assumption regarding the given password.  It will simply be
       treated as a byte sequence.

RETURN VALUES

       PKCS5_PBE_keyivgen(), PKCS5_v2_PBE_keyivgen(), PKCS5_v2_PBE_keyivgen_ex(),
       PKCS5_v2_scrypt_keyivgen(), PKCS5_v2_scrypt_keyivgen_ex(), PKCS5_pbe_set0_algor() and
       PKCS5_pbe_set0_algor_ex() return 1 for success and 0 if an error occurs.

       PKCS5_pbe_set(), PKCS5_pbe_set_ex(), PKCS5_pbe2_set(), PKCS5_pbe2_set_iv(),
       PKCS5_pbe2_set_iv_ex(), PKCS5_pbe2_set_scrypt(), PKCS5_pbkdf2_set() and
       PKCS5_pbkdf2_set_ex() return an X509_ALGOR object or NULL if an error occurs.

CONFORMING TO

       IETF RFC 8018 (<https://tools.ietf.org/html/rfc8018>)

SEE ALSO

       EVP_PBE_CipherInit_ex(3), PKCS12_pbe_crypt_ex(3), passphrase-encoding(7)

HISTORY

       PKCS5_v2_PBE_keyivgen_ex(), EVP_PBE_scrypt_ex(), PKCS5_v2_scrypt_keyivgen_ex(),
       PKCS5_pbe_set0_algor_ex(), PKCS5_pbe_set_ex(), PKCS5_pbe2_set_iv_ex() and
       PKCS5_pbkdf2_set_ex() were added in OpenSSL 3.0.

       From OpenSSL 3.0 the PBKDF1 algorithm used in PKCS5_PBE_keyivgen() and
       PKCS5_PBE_keyivgen_ex() has been moved to the legacy provider as an EVP_KDF.

COPYRIGHT

       Copyright 2021 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the Apache License 2.0 (the "License").  You may not use this file except
       in compliance with the License.  You can obtain a copy in the file LICENSE in the source
       distribution or at <https://www.openssl.org/source/license.html>.