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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 | ||
