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Edit File : EVP_PKEY_decrypt_init.3 \| Size : 6.81 KB
.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \(-- will .\" give an unbreakable dash, \(PI will give pi, \(L" will give a left .\" double quote, and \(R" will give a right double quote. \(C+ will .\" give a nicer C++. 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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" EVP_PKEY_decrypt_init, EVP_PKEY_decrypt \- decrypt using a public key algorithm .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/evp.h> \& \& int EVP_PKEY_decrypt_init(EVP_PKEY_CTX ctx); \& int EVP_PKEY_decrypt(EVP_PKEY_CTX ctx, \& unsigned char out, size_t outlen, \& const unsigned char in, size_t inlen); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" The \fBEVP_PKEY_decrypt_init()\fR function initializes a public key algorithm context using key \fBpkey\fR for a decryption operation. .PP The \fBEVP_PKEY_decrypt()\fR function performs a public key decryption operation using \fBctx\fR. The data to be decrypted is specified using the \fBin\fR and \&\fBinlen\fR parameters. If \fBout\fR is \fB\s-1NULL\s0\fR then the maximum size of the output buffer is written to the \fBoutlen\fR parameter. If \fBout\fR is not \fB\s-1NULL\s0\fR then before the call the \fBoutlen\fR parameter should contain the length of the \&\fBout\fR buffer, if the call is successful the decrypted data is written to \&\fBout\fR and the amount of data written to \fBoutlen\fR. .SH "NOTES" .IX Header "NOTES" After the call to \fBEVP_PKEY_decrypt_init()\fR algorithm specific control operations can be performed to set any appropriate parameters for the operation. .PP The function \fBEVP_PKEY_decrypt()\fR can be called more than once on the same context if several operations are performed using the same parameters. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBEVP_PKEY_decrypt_init()\fR and \fBEVP_PKEY_decrypt()\fR 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. .SH "EXAMPLE" .IX Header "EXAMPLE" Decrypt data using \s-1OAEP\s0 (for \s-1RSA\s0 keys): .PP .Vb 2 \& #include <openssl/evp.h> \& #include <openssl/rsa.h> \& \& EVP_PKEY_CTX ctx; \& unsigned char out, in; \& size_t outlen, inlen; \& EVP_PKEY key; \& /* NB: assumes key in, inlen are already set up \& * and that key is an RSA private key \& / \& ctx = EVP_PKEY_CTX_new(key); \& if (!ctx) \& / Error occurred / \& if (EVP_PKEY_decrypt_init(ctx) <= 0) \& / Error / \& if (EVP_PKEY_CTX_set_rsa_padding(ctx, RSA_OAEP_PADDING) <= 0) \& / Error / \& \& / Determine buffer length / \& if (EVP_PKEY_decrypt(ctx, NULL, &outlen, in, inlen) <= 0) \& / Error / \& \& out = OPENSSL_malloc(outlen); \& \& if (!out) \& / malloc failure / \& \& if (EVP_PKEY_decrypt(ctx, out, &outlen, in, inlen) <= 0) \& / Error / \& \& / Decrypted data is outlen bytes written to buffer out */ .Ve .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBEVP_PKEY_CTX_new\fR\\|(3), \&\fBEVP_PKEY_encrypt\fR\\|(3), \&\fBEVP_PKEY_sign\fR\\|(3), \&\fBEVP_PKEY_verify\fR\\|(3), \&\fBEVP_PKEY_verify_recover\fR\\|(3), \&\fBEVP_PKEY_derive\fR\\|(3) .SH "HISTORY" .IX Header "HISTORY" These functions were first added to OpenSSL 1.0.0. Back

Edit File : EVP_PKEY_decrypt_init.3 | Size : 6.81 KB

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.\" ========================================================================
.\"
.IX Title "EVP_PKEY_decrypt 3"
.TH EVP_PKEY_decrypt 3 "2019-12-20" "1.0.2u" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
EVP_PKEY_decrypt_init, EVP_PKEY_decrypt \- decrypt using a public key algorithm
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/evp.h>
\&
\& int EVP_PKEY_decrypt_init(EVP_PKEY_CTX *ctx);
\& int EVP_PKEY_decrypt(EVP_PKEY_CTX *ctx,
\&                        unsigned char *out, size_t *outlen,
\&                        const unsigned char *in, size_t inlen);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \fBEVP_PKEY_decrypt_init()\fR function initializes a public key algorithm
context using key \fBpkey\fR for a decryption operation.
.PP
The \fBEVP_PKEY_decrypt()\fR function performs a public key decryption operation
using \fBctx\fR. The data to be decrypted is specified using the \fBin\fR and
\&\fBinlen\fR parameters. If \fBout\fR is \fB\s-1NULL\s0\fR then the maximum size of the output
buffer is written to the \fBoutlen\fR parameter. If \fBout\fR is not \fB\s-1NULL\s0\fR then
before the call the \fBoutlen\fR parameter should contain the length of the
\&\fBout\fR buffer, if the call is successful the decrypted data is written to
\&\fBout\fR and the amount of data written to \fBoutlen\fR.
.SH "NOTES"
.IX Header "NOTES"
After the call to \fBEVP_PKEY_decrypt_init()\fR algorithm specific control
operations can be performed to set any appropriate parameters for the
operation.
.PP
The function \fBEVP_PKEY_decrypt()\fR can be called more than once on the same
context if several operations are performed using the same parameters.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBEVP_PKEY_decrypt_init()\fR and \fBEVP_PKEY_decrypt()\fR 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.
.SH "EXAMPLE"
.IX Header "EXAMPLE"
Decrypt data using \s-1OAEP\s0 (for \s-1RSA\s0 keys):
.PP
.Vb 2
\& #include <openssl/evp.h>
\& #include <openssl/rsa.h>
\&
\& EVP_PKEY_CTX *ctx;
\& unsigned char *out, *in;
\& size_t outlen, inlen; 
\& EVP_PKEY *key;
\& /* NB: assumes key in, inlen are already set up
\&  * and that key is an RSA private key
\&  */
\& ctx = EVP_PKEY_CTX_new(key);
\& if (!ctx)
\&        /* Error occurred */
\& if (EVP_PKEY_decrypt_init(ctx) <= 0)
\&        /* Error */
\& if (EVP_PKEY_CTX_set_rsa_padding(ctx, RSA_OAEP_PADDING) <= 0)
\&        /* Error */
\&
\& /* Determine buffer length */
\& if (EVP_PKEY_decrypt(ctx, NULL, &outlen, in, inlen) <= 0)
\&        /* Error */
\&
\& out = OPENSSL_malloc(outlen);
\&
\& if (!out)
\&        /* malloc failure */
\& 
\& if (EVP_PKEY_decrypt(ctx, out, &outlen, in, inlen) <= 0)
\&        /* Error */
\&
\& /* Decrypted data is outlen bytes written to buffer out */
.Ve
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBEVP_PKEY_CTX_new\fR\|(3),
\&\fBEVP_PKEY_encrypt\fR\|(3),
\&\fBEVP_PKEY_sign\fR\|(3),
\&\fBEVP_PKEY_verify\fR\|(3),
\&\fBEVP_PKEY_verify_recover\fR\|(3),
\&\fBEVP_PKEY_derive\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
These functions were first added to OpenSSL 1.0.0.

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