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author | schwarze <> | 2016-11-03 09:35:34 +0000 |
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committer | schwarze <> | 2016-11-03 09:35:34 +0000 |
commit | 4d607f17ea3eb38ed9f7703afd423f6055c686d4 (patch) | |
tree | 58d82d0d7f6aeee380eaadbcfaa231ecbe6b90a0 /src/lib/libcrypto/doc/EVP_VerifyInit.pod | |
parent | cf67afe5881727d740e9f6c772aa478123f7d698 (diff) | |
download | openbsd-4d607f17ea3eb38ed9f7703afd423f6055c686d4.tar.gz openbsd-4d607f17ea3eb38ed9f7703afd423f6055c686d4.tar.bz2 openbsd-4d607f17ea3eb38ed9f7703afd423f6055c686d4.zip |
convert EVP manuals from pod to mdoc
Diffstat (limited to 'src/lib/libcrypto/doc/EVP_VerifyInit.pod')
-rw-r--r-- | src/lib/libcrypto/doc/EVP_VerifyInit.pod | 96 |
1 files changed, 0 insertions, 96 deletions
diff --git a/src/lib/libcrypto/doc/EVP_VerifyInit.pod b/src/lib/libcrypto/doc/EVP_VerifyInit.pod deleted file mode 100644 index b0d3f8e4c9..0000000000 --- a/src/lib/libcrypto/doc/EVP_VerifyInit.pod +++ /dev/null | |||
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1 | =pod | ||
2 | |||
3 | =head1 NAME | ||
4 | |||
5 | EVP_VerifyInit, EVP_VerifyUpdate, EVP_VerifyFinal - EVP signature verification | ||
6 | functions | ||
7 | |||
8 | =head1 SYNOPSIS | ||
9 | |||
10 | #include <openssl/evp.h> | ||
11 | |||
12 | int EVP_VerifyInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl); | ||
13 | int EVP_VerifyUpdate(EVP_MD_CTX *ctx, const void *d, unsigned int cnt); | ||
14 | int EVP_VerifyFinal(EVP_MD_CTX *ctx,unsigned char *sigbuf, unsigned int siglen,EVP_PKEY *pkey); | ||
15 | |||
16 | int EVP_VerifyInit(EVP_MD_CTX *ctx, const EVP_MD *type); | ||
17 | |||
18 | =head1 DESCRIPTION | ||
19 | |||
20 | The EVP signature verification routines are a high level interface to digital | ||
21 | signatures. | ||
22 | |||
23 | EVP_VerifyInit_ex() sets up verification context B<ctx> to use digest | ||
24 | B<type> from ENGINE B<impl>. B<ctx> must be initialized by calling | ||
25 | EVP_MD_CTX_init() before calling this function. | ||
26 | |||
27 | EVP_VerifyUpdate() hashes B<cnt> bytes of data at B<d> into the | ||
28 | verification context B<ctx>. This function can be called several times on the | ||
29 | same B<ctx> to include additional data. | ||
30 | |||
31 | EVP_VerifyFinal() verifies the data in B<ctx> using the public key B<pkey> | ||
32 | and against the B<siglen> bytes at B<sigbuf>. | ||
33 | |||
34 | EVP_VerifyInit() initializes verification context B<ctx> to use the default | ||
35 | implementation of digest B<type>. | ||
36 | |||
37 | =head1 RETURN VALUES | ||
38 | |||
39 | EVP_VerifyInit_ex() and EVP_VerifyUpdate() return 1 for success and 0 for | ||
40 | failure. | ||
41 | |||
42 | EVP_VerifyFinal() returns 1 for a correct signature, 0 for failure and -1 if | ||
43 | some other error occurred. | ||
44 | |||
45 | The error codes can be obtained by L<ERR_get_error(3)|ERR_get_error(3)>. | ||
46 | |||
47 | =head1 NOTES | ||
48 | |||
49 | The B<EVP> interface to digital signatures should almost always be used in | ||
50 | preference to the low level interfaces. This is because the code then becomes | ||
51 | transparent to the algorithm used and much more flexible. | ||
52 | |||
53 | Due to the link between message digests and public key algorithms the correct | ||
54 | digest algorithm must be used with the correct public key type. A list of | ||
55 | algorithms and associated public key algorithms appears in | ||
56 | L<EVP_DigestInit(3)|EVP_DigestInit(3)>. | ||
57 | |||
58 | The call to EVP_VerifyFinal() internally finalizes a copy of the digest context. | ||
59 | This means that calls to EVP_VerifyUpdate() and EVP_VerifyFinal() can be called | ||
60 | later to digest and verify additional data. | ||
61 | |||
62 | Since only a copy of the digest context is ever finalized the context must | ||
63 | be cleaned up after use by calling EVP_MD_CTX_cleanup() or a memory leak | ||
64 | will occur. | ||
65 | |||
66 | =head1 BUGS | ||
67 | |||
68 | Older versions of this documentation wrongly stated that calls to | ||
69 | EVP_VerifyUpdate() could not be made after calling EVP_VerifyFinal(). | ||
70 | |||
71 | Since the public key is passed in the call to EVP_SignFinal() any error | ||
72 | relating to the private key (for example an unsuitable key and digest | ||
73 | combination) will not be indicated until after potentially large amounts of | ||
74 | data have been passed through EVP_SignUpdate(). | ||
75 | |||
76 | It is not possible to change the signing parameters using these function. | ||
77 | |||
78 | The previous two bugs are fixed in the newer EVP_VerifyDigest*() function. | ||
79 | |||
80 | =head1 SEE ALSO | ||
81 | |||
82 | L<evp(3)|evp(3)>, | ||
83 | L<EVP_SignInit(3)|EVP_SignInit(3)>, | ||
84 | L<EVP_DigestInit(3)|EVP_DigestInit(3)>, L<err(3)|err(3)>, | ||
85 | L<evp(3)|evp(3)>, L<hmac(3)|hmac(3)>, L<md2(3)|md2(3)>, | ||
86 | L<md5(3)|md5(3)>, L<ripemd(3)|ripemd(3)>, | ||
87 | L<sha(3)|sha(3)>, L<dgst(1)|dgst(1)> | ||
88 | |||
89 | =head1 HISTORY | ||
90 | |||
91 | EVP_VerifyInit(), EVP_VerifyUpdate() and EVP_VerifyFinal() are | ||
92 | available in all versions of SSLeay and OpenSSL. | ||
93 | |||
94 | EVP_VerifyInit_ex() was added in OpenSSL 0.9.7 | ||
95 | |||
96 | =cut | ||