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EVP_PKEY_ENCRYPT(3) | Library Functions Manual | EVP_PKEY_ENCRYPT(3) |
NAME
EVP_PKEY_encrypt_init
,
EVP_PKEY_encrypt
—
encrypt using a public key algorithm
SYNOPSIS
#include
<openssl/evp.h>
int
EVP_PKEY_encrypt_init
(EVP_PKEY_CTX
*ctx);
int
EVP_PKEY_encrypt
(EVP_PKEY_CTX
*ctx, unsigned char *out,
size_t *outlen,
const unsigned char *in,
size_t inlen);
DESCRIPTION
TheEVP_PKEY_encrypt_init
() function
initializes a public key algorithm context using key
ctx->pkey for an encryption operation.
The EVP_PKEY_encrypt
() function performs a
public key encryption operation using ctx.
The data to be encrypted is specified using the
in and inlen
parameters. If out is
NULL
, then the maximum size of the output
buffer is written to the outlen parameter. If
out is not
NULL
, then before the call the
outlen parameter should contain the length of
the out buffer. If the call is successful,
the encrypted data is written to out and the
amount of data written to outlen.
After the call to EVP_PKEY_encrypt_init
(),
algorithm specific control operations can be performed to set any appropriate
parameters for the operation.
The function EVP_PKEY_encrypt
() can be called
more than once on the same context if several operations are performed using
the same parameters.
RETURN VALUES
EVP_PKEY_encrypt_init
() and
EVP_PKEY_encrypt
() return 1 for success and
0 or a negative value for failure. In particular, a return value of -2
indicates the operation is not supported by the public key algorithm.
EXAMPLES
Encrypt data using OAEP (for RSA keys). See also PEM_read_PUBKEY(3) and d2i_X509(3) for means to load a public key. You may also simply set ‘eng = NULL;
’ to start with the default
OpenSSL RSA implementation:
#include <openssl/evp.h> #include <openssl/rsa.h> #include <openssl/engine.h> EVP_PKEY_CTX *ctx; ENGINE *eng; unsigned char *out, *in; size_t outlen, inlen; EVP_PKEY *key; /* NB: assumes eng, key in, inlen are already set up * and that key is an RSA public key */ ctx = EVP_PKEY_CTX_new(key, eng); if (!ctx) /* Error occurred */ if (EVP_PKEY_encrypt_init(ctx) <= 0) /* Error */ if (EVP_PKEY_CTX_set_rsa_padding(ctx, RSA_PKCS1_OAEP_PADDING) <= 0) /* Error */ /* Determine buffer length */ if (EVP_PKEY_encrypt(ctx, NULL, &outlen, in, inlen) <= 0) /* Error */ out = malloc(outlen); if (!out) /* malloc failure */ if (EVP_PKEY_encrypt(ctx, out, &outlen, in, inlen) <= 0) /* Error */ /* Encrypted data is outlen bytes written to buffer out */
SEE ALSO
EVP_PKEY_CTX_new(3), EVP_PKEY_decrypt(3), EVP_PKEY_derive(3), EVP_PKEY_meth_set_encrypt(3), EVP_PKEY_sign(3), EVP_PKEY_verify(3), EVP_PKEY_verify_recover(3)HISTORY
EVP_PKEY_encrypt_init
() and
EVP_PKEY_encrypt
() first appeared in
OpenSSL 1.0.0 and have been available since OpenBSD
4.9.March 31, 2022 | Debian |