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| -rw-r--r-- | src/lib/libcrypto/doc/EVP_PKEY_verify.pod | 91 |
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diff --git a/src/lib/libcrypto/doc/EVP_PKEY_verify.pod b/src/lib/libcrypto/doc/EVP_PKEY_verify.pod deleted file mode 100644 index f93e5fc6c3..0000000000 --- a/src/lib/libcrypto/doc/EVP_PKEY_verify.pod +++ /dev/null | |||
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| 1 | =pod | ||
| 2 | |||
| 3 | =head1 NAME | ||
| 4 | |||
| 5 | EVP_PKEY_verify_init, EVP_PKEY_verify - signature verification using a public key algorithm | ||
| 6 | |||
| 7 | =head1 SYNOPSIS | ||
| 8 | |||
| 9 | #include <openssl/evp.h> | ||
| 10 | |||
| 11 | int EVP_PKEY_verify_init(EVP_PKEY_CTX *ctx); | ||
| 12 | int EVP_PKEY_verify(EVP_PKEY_CTX *ctx, | ||
| 13 | const unsigned char *sig, size_t siglen, | ||
| 14 | const unsigned char *tbs, size_t tbslen); | ||
| 15 | |||
| 16 | =head1 DESCRIPTION | ||
| 17 | |||
| 18 | The EVP_PKEY_verify_init() function initializes a public key algorithm | ||
| 19 | context using key B<pkey> for a signature verification operation. | ||
| 20 | |||
| 21 | The EVP_PKEY_verify() function performs a public key verification operation | ||
| 22 | using B<ctx>. The signature is specified using the B<sig> and | ||
| 23 | B<siglen> parameters. The verified data (i.e. the data believed originally | ||
| 24 | signed) is specified using the B<tbs> and B<tbslen> parameters. | ||
| 25 | |||
| 26 | =head1 NOTES | ||
| 27 | |||
| 28 | After the call to EVP_PKEY_verify_init() algorithm specific control | ||
| 29 | operations can be performed to set any appropriate parameters for the | ||
| 30 | operation. | ||
| 31 | |||
| 32 | The function EVP_PKEY_verify() can be called more than once on the same | ||
| 33 | context if several operations are performed using the same parameters. | ||
| 34 | |||
| 35 | =head1 RETURN VALUES | ||
| 36 | |||
| 37 | EVP_PKEY_verify_init() and EVP_PKEY_verify() return 1 if the verification was | ||
| 38 | successful and 0 if it failed. Unlike other functions the return value 0 from | ||
| 39 | EVP_PKEY_verify() only indicates that the signature did not not verify | ||
| 40 | successfully (that is tbs did not match the original data or the signature was | ||
| 41 | of invalid form) it is not an indication of a more serious error. | ||
| 42 | |||
| 43 | A negative value indicates an error other that signature verification failure. | ||
| 44 | In particular a return value of -2 indicates the operation is not supported by | ||
| 45 | the public key algorithm. | ||
| 46 | |||
| 47 | =head1 EXAMPLE | ||
| 48 | |||
| 49 | Verify signature using PKCS#1 and SHA256 digest: | ||
| 50 | |||
| 51 | #include <openssl/evp.h> | ||
| 52 | #include <openssl/rsa.h> | ||
| 53 | |||
| 54 | EVP_PKEY_CTX *ctx; | ||
| 55 | unsigned char *md, *sig; | ||
| 56 | size_t mdlen, siglen; | ||
| 57 | EVP_PKEY *verify_key; | ||
| 58 | /* NB: assumes verify_key, sig, siglen md and mdlen are already set up | ||
| 59 | * and that verify_key is an RSA public key | ||
| 60 | */ | ||
| 61 | ctx = EVP_PKEY_CTX_new(verify_key); | ||
| 62 | if (!ctx) | ||
| 63 | /* Error occurred */ | ||
| 64 | if (EVP_PKEY_verify_init(ctx) <= 0) | ||
| 65 | /* Error */ | ||
| 66 | if (EVP_PKEY_CTX_set_rsa_padding(ctx, RSA_PKCS1_PADDING) <= 0) | ||
| 67 | /* Error */ | ||
| 68 | if (EVP_PKEY_CTX_set_signature_md(ctx, EVP_sha256()) <= 0) | ||
| 69 | /* Error */ | ||
| 70 | |||
| 71 | /* Perform operation */ | ||
| 72 | ret = EVP_PKEY_verify(ctx, sig, siglen, md, mdlen); | ||
| 73 | |||
| 74 | /* ret == 1 indicates success, 0 verify failure and < 0 for some | ||
| 75 | * other error. | ||
| 76 | */ | ||
| 77 | |||
| 78 | =head1 SEE ALSO | ||
| 79 | |||
| 80 | L<EVP_PKEY_CTX_new(3)|EVP_PKEY_CTX_new(3)>, | ||
| 81 | L<EVP_PKEY_encrypt(3)|EVP_PKEY_encrypt(3)>, | ||
| 82 | L<EVP_PKEY_decrypt(3)|EVP_PKEY_decrypt(3)>, | ||
| 83 | L<EVP_PKEY_sign(3)|EVP_PKEY_sign(3)>, | ||
| 84 | L<EVP_PKEY_verifyrecover(3)|EVP_PKEY_verifyrecover(3)>, | ||
| 85 | L<EVP_PKEY_derive(3)|EVP_PKEY_derive(3)> | ||
| 86 | |||
| 87 | =head1 HISTORY | ||
| 88 | |||
| 89 | These functions were first added to OpenSSL 1.0.0. | ||
| 90 | |||
| 91 | =cut | ||
