230 lines
7.3 KiB
Groff
Executable File
230 lines
7.3 KiB
Groff
Executable File
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.\" ========================================================================
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.\"
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.IX Title "EVP_PKEY_VERIFY 3"
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.TH EVP_PKEY_VERIFY 3 "2020-03-02" "3.0.0-dev" "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_verify_init, EVP_PKEY_verify
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\&\- signature verification 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_verify_init(EVP_PKEY_CTX *ctx);
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\& int EVP_PKEY_verify(EVP_PKEY_CTX *ctx,
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\& const unsigned char *sig, size_t siglen,
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\& const unsigned char *tbs, size_t tbslen);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fIEVP_PKEY_verify_init()\fR initializes a public key algorithm context \fIctx\fR for
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signing using the algorithm given when the context was created
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using \fIEVP_PKEY_CTX_new\fR\|(3) or variants thereof. The algorithm is used to
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fetch a \fB\s-1EVP_SIGNATURE\s0\fR method implicitly, see \*(L"Implicit fetch\*(R" in \fIprovider\fR\|(7)
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for more information about implict fetches.
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.PP
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The \fIEVP_PKEY_verify()\fR function performs a public key verification operation
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using \fIctx\fR. The signature is specified using the \fIsig\fR and
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\&\fIsiglen\fR parameters. The verified data (i.e. the data believed originally
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signed) is specified using the \fItbs\fR and \fItbslen\fR parameters.
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.SH "NOTES"
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.IX Header "NOTES"
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After the call to \fIEVP_PKEY_verify_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_verify()\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_verify_init()\fR and \fIEVP_PKEY_verify()\fR return 1 if the verification was
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successful and 0 if it failed. Unlike other functions the return value 0 from
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\&\fIEVP_PKEY_verify()\fR only indicates that the signature did not verify
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successfully (that is tbs did not match the original data or the signature was
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of invalid form) it is not an indication of a more serious error.
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.PP
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A negative value indicates an error other that signature verification failure.
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In particular a return value of \-2 indicates the operation is not supported by
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the public key algorithm.
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.SH "EXAMPLES"
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.IX Header "EXAMPLES"
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Verify signature using PKCS#1 and \s-1SHA256\s0 digest:
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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 *md, *sig;
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\& size_t mdlen, siglen;
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\& EVP_PKEY *verify_key;
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\&
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\& /*
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\& * NB: assumes verify_key, sig, siglen md and mdlen are already set up
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\& * and that verify_key is an RSA public key
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\& */
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\& ctx = EVP_PKEY_CTX_new(verify_key, NULL /* no engine */);
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\& if (!ctx)
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\& /* Error occurred */
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\& if (EVP_PKEY_verify_init(ctx) <= 0)
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\& /* Error */
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\& if (EVP_PKEY_CTX_set_rsa_padding(ctx, RSA_PKCS1_PADDING) <= 0)
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\& /* Error */
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\& if (EVP_PKEY_CTX_set_signature_md(ctx, EVP_sha256()) <= 0)
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\& /* Error */
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\&
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\& /* Perform operation */
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\& ret = EVP_PKEY_verify(ctx, sig, siglen, md, mdlen);
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\&
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\& /*
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\& * ret == 1 indicates success, 0 verify failure and < 0 for some
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\& * other error.
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\& */
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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_decrypt\fR\|(3),
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\&\fIEVP_PKEY_sign\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 added in OpenSSL 1.0.0.
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2006\-2018 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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