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Side by Side Diff: openssl/doc/crypto/EVP_PKEY_encrypt.pod

Issue 9254031: Upgrade chrome's OpenSSL to same version Android ships with. (Closed) Base URL: http://src.chromium.org/svn/trunk/deps/third_party/openssl/
Patch Set: '' Created 8 years, 11 months ago
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1 =pod
2
3 =head1 NAME
4
5 EVP_PKEY_encrypt_init, EVP_PKEY_encrypt - encrypt using a public key algorithm
6
7 =head1 SYNOPSIS
8
9 #include <openssl/evp.h>
10
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);
15
16 =head1 DESCRIPTION
17
18 The EVP_PKEY_encrypt_init() function initializes a public key algorithm
19 context using key B<pkey> for an encryption operation.
20
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>.
28
29 =head1 NOTES
30
31 After the call to EVP_PKEY_encrypt_init() algorithm specific control
32 operations can be performed to set any appropriate parameters for the
33 operation.
34
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.
37
38 =head1 RETURN VALUES
39
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.
43
44 =head1 EXAMPLE
45
46 Encrypt data using OAEP (for RSA keys):
47
48 #include <openssl/evp.h>
49 #include <openssl/rsa.h>
50
51 EVP_PKEY_CTX *ctx;
52 unsigned char *out, *in;
53 size_t outlen, inlen;
54 EVP_PKEY *key;
55 /* NB: assumes key in, inlen are already set up
56 * and that key is an RSA public key
57 */
58 ctx = EVP_PKEY_CTX_new(key);
59 if (!ctx)
60 /* Error occurred */
61 if (EVP_PKEY_encrypt_init(ctx) <= 0)
62 /* Error */
63 if (EVP_PKEY_CTX_set_rsa_padding(ctx, RSA_OAEP_PADDING) <= 0)
64 /* Error */
65
66 /* Determine buffer length */
67 if (EVP_PKEY_encrypt(ctx, NULL, &outlen, in, inlen) <= 0)
68 /* Error */
69
70 out = OPENSSL_malloc(outlen);
71
72 if (!out)
73 /* malloc failure */
74
75 if (EVP_PKEY_encrypt(ctx, out, &outlen, in, inlen) <= 0)
76 /* Error */
77
78 /* Encrypted data is outlen bytes written to buffer out */
79
80 =head1 SEE ALSO
81
82 L<EVP_PKEY_CTX_new(3)|EVP_PKEY_CTX_new(3)>,
83 L<EVP_PKEY_decrypt(3)|EVP_PKEY_decrypt(3)>,
84 L<EVP_PKEY_sign(3)|EVP_PKEY_sign(3)>,
85 L<EVP_PKEY_verify(3)|EVP_PKEY_verify(3)>,
86 L<EVP_PKEY_verifyrecover(3)|EVP_PKEY_verifyrecover(3)>,
87 L<EVP_PKEY_derive(3)|EVP_PKEY_derive(3)>
88
89 =head1 HISTORY
90
91 These functions were first added to OpenSSL 1.0.0.
92
93 =cut
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