226 lines
6.8 KiB
Groff
226 lines
6.8 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "EVP_PKEY_decrypt 3"
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.TH EVP_PKEY_decrypt 3 "2016-03-01" "1.0.2g" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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EVP_PKEY_decrypt_init, EVP_PKEY_decrypt \- decrypt using a public key algorithm
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/evp.h>
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\&
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\& int EVP_PKEY_decrypt_init(EVP_PKEY_CTX *ctx);
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\& int EVP_PKEY_decrypt(EVP_PKEY_CTX *ctx,
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\& unsigned char *out, size_t *outlen,
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\& const unsigned char *in, size_t inlen);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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The \fIEVP_PKEY_decrypt_init()\fR function initializes a public key algorithm
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context using key \fBpkey\fR for a decryption operation.
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.PP
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The \fIEVP_PKEY_decrypt()\fR function performs a public key decryption operation
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using \fBctx\fR. The data to be decrypted is specified using the \fBin\fR and
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\&\fBinlen\fR parameters. If \fBout\fR is \fB\s-1NULL\s0\fR then the maximum size of the output
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buffer is written to the \fBoutlen\fR parameter. If \fBout\fR is not \fB\s-1NULL\s0\fR then
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before the call the \fBoutlen\fR parameter should contain the length of the
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\&\fBout\fR buffer, if the call is successful the decrypted data is written to
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\&\fBout\fR and the amount of data written to \fBoutlen\fR.
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.SH "NOTES"
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.IX Header "NOTES"
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After the call to \fIEVP_PKEY_decrypt_init()\fR algorithm specific control
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operations can be performed to set any appropriate parameters for the
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operation.
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.PP
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The function \fIEVP_PKEY_decrypt()\fR can be called more than once on the same
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context if several operations are performed using the same parameters.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIEVP_PKEY_decrypt_init()\fR and \fIEVP_PKEY_decrypt()\fR return 1 for success and 0
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or a negative value for failure. In particular a return value of \-2
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indicates the operation is not supported by the public key algorithm.
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.SH "EXAMPLE"
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.IX Header "EXAMPLE"
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Decrypt data using \s-1OAEP \s0(for \s-1RSA\s0 keys):
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.PP
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.Vb 2
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\& #include <openssl/evp.h>
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\& #include <openssl/rsa.h>
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\&
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\& EVP_PKEY_CTX *ctx;
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\& unsigned char *out, *in;
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\& size_t outlen, inlen;
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\& EVP_PKEY *key;
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\& /* NB: assumes key in, inlen are already set up
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\& * and that key is an RSA private key
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\& */
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\& ctx = EVP_PKEY_CTX_new(key);
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\& if (!ctx)
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\& /* Error occurred */
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\& if (EVP_PKEY_decrypt_init(ctx) <= 0)
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\& /* Error */
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\& if (EVP_PKEY_CTX_set_rsa_padding(ctx, RSA_OAEP_PADDING) <= 0)
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\& /* Error */
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\&
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\& /* Determine buffer length */
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\& if (EVP_PKEY_decrypt(ctx, NULL, &outlen, in, inlen) <= 0)
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\& /* Error */
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\&
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\& out = OPENSSL_malloc(outlen);
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\&
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\& if (!out)
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\& /* malloc failure */
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\&
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\& if (EVP_PKEY_decrypt(ctx, out, &outlen, in, inlen) <= 0)
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\& /* Error */
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\&
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\& /* Decrypted data is outlen bytes written to buffer out */
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.Ve
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIEVP_PKEY_CTX_new\fR\|(3),
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\&\fIEVP_PKEY_encrypt\fR\|(3),
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\&\fIEVP_PKEY_sign\fR\|(3),
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\&\fIEVP_PKEY_verify\fR\|(3),
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\&\fIEVP_PKEY_verify_recover\fR\|(3),
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\&\fIEVP_PKEY_derive\fR\|(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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These functions were first added to OpenSSL 1.0.0.
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