5 EVP_PKEY_encrypt_init, EVP_PKEY_encrypt - encrypt using a public key algorithm
9 #include <openssl/evp.h>
11 int EVP_PKEY_encrypt_init(EVP_PKEY_CTX *ctx);
12 int EVP_PKEY_encrypt(EVP_PKEY_CTX *ctx,
13 unsigned char *out, size_t *outlen,
14 const unsigned char *in, size_t inlen);
18 The EVP_PKEY_encrypt_init() function initializes a public key algorithm
19 context using key B<pkey> for an encryption operation.
21 The EVP_PKEY_encrypt() function performs a public key encryption operation
22 using B<ctx>. The data to be encrypted is specified using the B<in> and
23 B<inlen> parameters. If B<out> is B<NULL> then the maximum size of the output
24 buffer is written to the B<outlen> parameter. If B<out> is not B<NULL> then
25 before the call the B<outlen> parameter should contain the length of the
26 B<out> buffer, if the call is successful the encrypted data is written to
27 B<out> and the amount of data written to B<outlen>.
31 After the call to EVP_PKEY_encrypt_init() algorithm specific control
32 operations can be performed to set any appropriate parameters for the
35 The function EVP_PKEY_encrypt() can be called more than once on the same
36 context if several operations are performed using the same parameters.
40 EVP_PKEY_encrypt_init() and EVP_PKEY_encrypt() return 1 for success and 0
41 or a negative value for failure. In particular a return value of -2
42 indicates the operation is not supported by the public key algorithm.
46 Encrypt data using OAEP (for RSA keys). See also L<PEM_read_PUBKEY(3)|pem(3)> or
47 L<d2i_X509(3)|d2i_X509(3)> for means to load a public key. You may also simply
48 set 'eng = NULL;' to start with the default OpenSSL RSA implementation:
50 #include <openssl/evp.h>
51 #include <openssl/rsa.h>
52 #include <openssl/engine.h>
56 unsigned char *out, *in;
59 /* NB: assumes eng, key, in, inlen are already set up,
60 * and that key is an RSA public key
62 ctx = EVP_PKEY_CTX_new(key,eng);
65 if (EVP_PKEY_encrypt_init(ctx) <= 0)
67 if (EVP_PKEY_CTX_set_rsa_padding(ctx, RSA_OAEP_PADDING) <= 0)
70 /* Determine buffer length */
71 if (EVP_PKEY_encrypt(ctx, NULL, &outlen, in, inlen) <= 0)
74 out = OPENSSL_malloc(outlen);
79 if (EVP_PKEY_encrypt(ctx, out, &outlen, in, inlen) <= 0)
82 /* Encrypted data is outlen bytes written to buffer out */
86 L<d2i_X509(3)|d2i_X509(3)>,
87 L<engine(3)|engine(3)>,
88 L<EVP_PKEY_CTX_new(3)|EVP_PKEY_CTX_new(3)>,
89 L<EVP_PKEY_decrypt(3)|EVP_PKEY_decrypt(3)>,
90 L<EVP_PKEY_sign(3)|EVP_PKEY_sign(3)>,
91 L<EVP_PKEY_verify(3)|EVP_PKEY_verify(3)>,
92 L<EVP_PKEY_verify_recover(3)|EVP_PKEY_verify_recover(3)>,
93 L<EVP_PKEY_derive(3)|EVP_PKEY_derive(3)>
97 These functions were first added to OpenSSL 1.0.0.