1.\" Automatically generated by Pod::Man version 1.15
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2.\" Sun Jan 12 18:05:25 2003
| 2.\" Mon Feb 3 10:00:58 2003
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3.\" 4.\" Standard preamble: 5.\" ====================================================================== 6.de Sh \" Subsection heading 7.br 8.if t .Sp 9.ne 5 10.PP 11\fB\\$1\fR 12.PP 13.. 14.de Sp \" Vertical space (when we can't use .PP) 15.if t .sp .5v 16.if n .sp 17.. 18.de Ip \" List item 19.br 20.ie \\n(.$>=3 .ne \\$3 21.el .ne 3 22.IP "\\$1" \\$2 23.. 24.de Vb \" Begin verbatim text 25.ft CW 26.nf 27.ne \\$1 28.. 29.de Ve \" End verbatim text 30.ft R 31 32.fi 33.. 34.\" Set up some character translations and predefined strings. \*(-- will 35.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left 36.\" double quote, and \*(R" will give a right double quote. | will give a 37.\" real vertical bar. \*(C+ will give a nicer C++. Capital omega is used 38.\" to do unbreakable dashes and therefore won't be available. \*(C` and 39.\" \*(C' expand to `' in nroff, nothing in troff, for use with C<> 40.tr \(*W-|\(bv\*(Tr 41.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p' 42.ie n \{\ 43. ds -- \(*W- 44. ds PI pi 45. if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch 46. if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch 47. ds L" "" 48. ds R" "" 49. ds C` "" 50. ds C' "" 51'br\} 52.el\{\ 53. ds -- \|\(em\| 54. ds PI \(*p 55. ds L" `` 56. ds R" '' 57'br\} 58.\" 59.\" If the F register is turned on, we'll generate index entries on stderr 60.\" for titles (.TH), headers (.SH), subsections (.Sh), items (.Ip), and 61.\" index entries marked with X<> in POD. Of course, you'll have to process 62.\" the output yourself in some meaningful fashion. 63.if \nF \{\ 64. de IX 65. tm Index:\\$1\t\\n%\t"\\$2" 66.. 67. nr % 0 68. rr F 69.\} 70.\" 71.\" For nroff, turn off justification. Always turn off hyphenation; it 72.\" makes way too many mistakes in technical documents. 73.hy 0 74.if n .na 75.\" 76.\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2). 77.\" Fear. Run. Save yourself. No user-serviceable parts. 78.bd B 3 79. \" fudge factors for nroff and troff 80.if n \{\ 81. ds #H 0 82. ds #V .8m 83. ds #F .3m 84. ds #[ \f1 85. ds #] \fP 86.\} 87.if t \{\ 88. ds #H ((1u-(\\\\n(.fu%2u))*.13m) 89. ds #V .6m 90. ds #F 0 91. ds #[ \& 92. ds #] \& 93.\} 94. \" simple accents for nroff and troff 95.if n \{\ 96. ds ' \& 97. ds ` \& 98. ds ^ \& 99. ds , \& 100. ds ~ ~ 101. ds / 102.\} 103.if t \{\ 104. ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u" 105. ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u' 106. ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u' 107. ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u' 108. ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u' 109. ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u' 110.\} 111. \" troff and (daisy-wheel) nroff accents 112.ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V' 113.ds 8 \h'\*(#H'\(*b\h'-\*(#H' 114.ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#] 115.ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H' 116.ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u' 117.ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#] 118.ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#] 119.ds ae a\h'-(\w'a'u*4/10)'e 120.ds Ae A\h'-(\w'A'u*4/10)'E 121. \" corrections for vroff 122.if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u' 123.if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u' 124. \" for low resolution devices (crt and lpr) 125.if \n(.H>23 .if \n(.V>19 \ 126\{\ 127. ds : e 128. ds 8 ss 129. ds o a 130. ds d- d\h'-1'\(ga 131. ds D- D\h'-1'\(hy 132. ds th \o'bp' 133. ds Th \o'LP' 134. ds ae ae 135. ds Ae AE 136.\} 137.rm #[ #] #H #V #F C 138.\" ====================================================================== 139.\"
| 3.\" 4.\" Standard preamble: 5.\" ====================================================================== 6.de Sh \" Subsection heading 7.br 8.if t .Sp 9.ne 5 10.PP 11\fB\\$1\fR 12.PP 13.. 14.de Sp \" Vertical space (when we can't use .PP) 15.if t .sp .5v 16.if n .sp 17.. 18.de Ip \" List item 19.br 20.ie \\n(.$>=3 .ne \\$3 21.el .ne 3 22.IP "\\$1" \\$2 23.. 24.de Vb \" Begin verbatim text 25.ft CW 26.nf 27.ne \\$1 28.. 29.de Ve \" End verbatim text 30.ft R 31 32.fi 33.. 34.\" Set up some character translations and predefined strings. \*(-- will 35.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left 36.\" double quote, and \*(R" will give a right double quote. | will give a 37.\" real vertical bar. \*(C+ will give a nicer C++. Capital omega is used 38.\" to do unbreakable dashes and therefore won't be available. \*(C` and 39.\" \*(C' expand to `' in nroff, nothing in troff, for use with C<> 40.tr \(*W-|\(bv\*(Tr 41.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p' 42.ie n \{\ 43. ds -- \(*W- 44. ds PI pi 45. if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch 46. if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch 47. ds L" "" 48. ds R" "" 49. ds C` "" 50. ds C' "" 51'br\} 52.el\{\ 53. ds -- \|\(em\| 54. ds PI \(*p 55. ds L" `` 56. ds R" '' 57'br\} 58.\" 59.\" If the F register is turned on, we'll generate index entries on stderr 60.\" for titles (.TH), headers (.SH), subsections (.Sh), items (.Ip), and 61.\" index entries marked with X<> in POD. Of course, you'll have to process 62.\" the output yourself in some meaningful fashion. 63.if \nF \{\ 64. de IX 65. tm Index:\\$1\t\\n%\t"\\$2" 66.. 67. nr % 0 68. rr F 69.\} 70.\" 71.\" For nroff, turn off justification. Always turn off hyphenation; it 72.\" makes way too many mistakes in technical documents. 73.hy 0 74.if n .na 75.\" 76.\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2). 77.\" Fear. Run. Save yourself. No user-serviceable parts. 78.bd B 3 79. \" fudge factors for nroff and troff 80.if n \{\ 81. ds #H 0 82. ds #V .8m 83. ds #F .3m 84. ds #[ \f1 85. ds #] \fP 86.\} 87.if t \{\ 88. ds #H ((1u-(\\\\n(.fu%2u))*.13m) 89. ds #V .6m 90. ds #F 0 91. ds #[ \& 92. ds #] \& 93.\} 94. \" simple accents for nroff and troff 95.if n \{\ 96. ds ' \& 97. ds ` \& 98. ds ^ \& 99. ds , \& 100. ds ~ ~ 101. ds / 102.\} 103.if t \{\ 104. ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u" 105. ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u' 106. ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u' 107. ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u' 108. ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u' 109. ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u' 110.\} 111. \" troff and (daisy-wheel) nroff accents 112.ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V' 113.ds 8 \h'\*(#H'\(*b\h'-\*(#H' 114.ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#] 115.ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H' 116.ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u' 117.ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#] 118.ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#] 119.ds ae a\h'-(\w'a'u*4/10)'e 120.ds Ae A\h'-(\w'A'u*4/10)'E 121. \" corrections for vroff 122.if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u' 123.if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u' 124. \" for low resolution devices (crt and lpr) 125.if \n(.H>23 .if \n(.V>19 \ 126\{\ 127. ds : e 128. ds 8 ss 129. ds o a 130. ds d- d\h'-1'\(ga 131. ds D- D\h'-1'\(hy 132. ds th \o'bp' 133. ds Th \o'LP' 134. ds ae ae 135. ds Ae AE 136.\} 137.rm #[ #] #H #V #F C 138.\" ====================================================================== 139.\"
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140.IX Title "rsautl 3" 141.TH rsautl 3 "0.9.7" "2003-01-12" "OpenSSL"
| 140.IX Title "RSAUTL 1" 141.TH RSAUTL 1 "0.9.7" "2003-02-03" "OpenSSL"
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142.UC 143.SH "NAME" 144rsautl \- \s-1RSA\s0 utility 145.SH "SYNOPSIS" 146.IX Header "SYNOPSIS" 147\&\fBopenssl\fR \fBrsautl\fR 148[\fB\-in file\fR] 149[\fB\-out file\fR] 150[\fB\-inkey file\fR] 151[\fB\-pubin\fR] 152[\fB\-certin\fR] 153[\fB\-sign\fR] 154[\fB\-verify\fR] 155[\fB\-encrypt\fR] 156[\fB\-decrypt\fR] 157[\fB\-pkcs\fR] 158[\fB\-ssl\fR] 159[\fB\-raw\fR] 160[\fB\-hexdump\fR] 161[\fB\-asn1parse\fR] 162.SH "DESCRIPTION" 163.IX Header "DESCRIPTION" 164The \fBrsautl\fR command can be used to sign, verify, encrypt and decrypt 165data using the \s-1RSA\s0 algorithm. 166.SH "COMMAND OPTIONS" 167.IX Header "COMMAND OPTIONS" 168.Ip "\fB\-in filename\fR" 4 169.IX Item "-in filename" 170This specifies the input filename to read data from or standard input 171if this option is not specified. 172.Ip "\fB\-out filename\fR" 4 173.IX Item "-out filename" 174specifies the output filename to write to or standard output by 175default. 176.Ip "\fB\-inkey file\fR" 4 177.IX Item "-inkey file" 178the input key file, by default it should be an \s-1RSA\s0 private key. 179.Ip "\fB\-pubin\fR" 4 180.IX Item "-pubin" 181the input file is an \s-1RSA\s0 public key. 182.Ip "\fB\-certin\fR" 4 183.IX Item "-certin" 184the input is a certificate containing an \s-1RSA\s0 public key. 185.Ip "\fB\-sign\fR" 4 186.IX Item "-sign" 187sign the input data and output the signed result. This requires 188and \s-1RSA\s0 private key. 189.Ip "\fB\-verify\fR" 4 190.IX Item "-verify" 191verify the input data and output the recovered data. 192.Ip "\fB\-encrypt\fR" 4 193.IX Item "-encrypt" 194encrypt the input data using an \s-1RSA\s0 public key. 195.Ip "\fB\-decrypt\fR" 4 196.IX Item "-decrypt" 197decrypt the input data using an \s-1RSA\s0 private key. 198.Ip "\fB\-pkcs, \-oaep, \-ssl, \-raw\fR" 4 199.IX Item "-pkcs, -oaep, -ssl, -raw" 200the padding to use: PKCS#1 v1.5 (the default), PKCS#1 \s-1OAEP\s0, 201special padding used in \s-1SSL\s0 v2 backwards compatible handshakes, 202or no padding, respectively. 203For signatures, only \fB\-pkcs\fR and \fB\-raw\fR can be used. 204.Ip "\fB\-hexdump\fR" 4 205.IX Item "-hexdump" 206hex dump the output data. 207.Ip "\fB\-asn1parse\fR" 4 208.IX Item "-asn1parse" 209asn1parse the output data, this is useful when combined with the 210\&\fB\-verify\fR option. 211.SH "NOTES" 212.IX Header "NOTES" 213\&\fBrsautl\fR because it uses the \s-1RSA\s0 algorithm directly can only be 214used to sign or verify small pieces of data. 215.SH "EXAMPLES" 216.IX Header "EXAMPLES" 217Sign some data using a private key: 218.PP 219.Vb 1 220\& openssl rsautl -sign -in file -inkey key.pem -out sig 221.Ve 222Recover the signed data 223.PP 224.Vb 1 225\& openssl rsautl -verify -in sig -inkey key.pem 226.Ve 227Examine the raw signed data: 228.PP 229.Vb 1 230\& openssl rsautl -verify -in file -inkey key.pem -raw -hexdump 231.Ve 232.Vb 8 233\& 0000 - 00 01 ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................ 234\& 0010 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................ 235\& 0020 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................ 236\& 0030 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................ 237\& 0040 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................ 238\& 0050 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................ 239\& 0060 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................ 240\& 0070 - ff ff ff ff 00 68 65 6c-6c 6f 20 77 6f 72 6c 64 .....hello world 241.Ve 242The PKCS#1 block formatting is evident from this. If this was done using 243encrypt and decrypt the block would have been of type 2 (the second byte) 244and random padding data visible instead of the 0xff bytes. 245.PP 246It is possible to analyse the signature of certificates using this 247utility in conjunction with \fBasn1parse\fR. Consider the self signed 248example in certs/pca-cert.pem . Running \fBasn1parse\fR as follows yields: 249.PP 250.Vb 1 251\& openssl asn1parse -in pca-cert.pem 252.Ve 253.Vb 18 254\& 0:d=0 hl=4 l= 742 cons: SEQUENCE 255\& 4:d=1 hl=4 l= 591 cons: SEQUENCE 256\& 8:d=2 hl=2 l= 3 cons: cont [ 0 ] 257\& 10:d=3 hl=2 l= 1 prim: INTEGER :02 258\& 13:d=2 hl=2 l= 1 prim: INTEGER :00 259\& 16:d=2 hl=2 l= 13 cons: SEQUENCE 260\& 18:d=3 hl=2 l= 9 prim: OBJECT :md5WithRSAEncryption 261\& 29:d=3 hl=2 l= 0 prim: NULL 262\& 31:d=2 hl=2 l= 92 cons: SEQUENCE 263\& 33:d=3 hl=2 l= 11 cons: SET 264\& 35:d=4 hl=2 l= 9 cons: SEQUENCE 265\& 37:d=5 hl=2 l= 3 prim: OBJECT :countryName 266\& 42:d=5 hl=2 l= 2 prim: PRINTABLESTRING :AU 267\& .... 268\& 599:d=1 hl=2 l= 13 cons: SEQUENCE 269\& 601:d=2 hl=2 l= 9 prim: OBJECT :md5WithRSAEncryption 270\& 612:d=2 hl=2 l= 0 prim: NULL 271\& 614:d=1 hl=3 l= 129 prim: BIT STRING 272.Ve 273The final \s-1BIT\s0 \s-1STRING\s0 contains the actual signature. It can be extracted with: 274.PP 275.Vb 1 276\& openssl asn1parse -in pca-cert.pem -out sig -noout -strparse 614 277.Ve 278The certificate public key can be extracted with: 279.PP 280.Vb 1 281\& openssl x509 -in test/testx509.pem -pubout -noout >pubkey.pem 282.Ve 283The signature can be analysed with: 284.PP 285.Vb 1 286\& openssl rsautl -in sig -verify -asn1parse -inkey pubkey.pem -pubin 287.Ve 288.Vb 6 289\& 0:d=0 hl=2 l= 32 cons: SEQUENCE 290\& 2:d=1 hl=2 l= 12 cons: SEQUENCE 291\& 4:d=2 hl=2 l= 8 prim: OBJECT :md5 292\& 14:d=2 hl=2 l= 0 prim: NULL 293\& 16:d=1 hl=2 l= 16 prim: OCTET STRING 294\& 0000 - f3 46 9e aa 1a 4a 73 c9-37 ea 93 00 48 25 08 b5 .F...Js.7...H%.. 295.Ve 296This is the parsed version of an \s-1ASN1\s0 DigestInfo structure. It can be seen that 297the digest used was md5. The actual part of the certificate that was signed can 298be extracted with: 299.PP 300.Vb 1 301\& openssl asn1parse -in pca-cert.pem -out tbs -noout -strparse 4 302.Ve 303and its digest computed with: 304.PP 305.Vb 2 306\& openssl md5 -c tbs 307\& MD5(tbs)= f3:46:9e:aa:1a:4a:73:c9:37:ea:93:00:48:25:08:b5 308.Ve 309which it can be seen agrees with the recovered value above. 310.SH "SEE ALSO" 311.IX Header "SEE ALSO" 312dgst(1), rsa(1), genrsa(1)
| 142.UC 143.SH "NAME" 144rsautl \- \s-1RSA\s0 utility 145.SH "SYNOPSIS" 146.IX Header "SYNOPSIS" 147\&\fBopenssl\fR \fBrsautl\fR 148[\fB\-in file\fR] 149[\fB\-out file\fR] 150[\fB\-inkey file\fR] 151[\fB\-pubin\fR] 152[\fB\-certin\fR] 153[\fB\-sign\fR] 154[\fB\-verify\fR] 155[\fB\-encrypt\fR] 156[\fB\-decrypt\fR] 157[\fB\-pkcs\fR] 158[\fB\-ssl\fR] 159[\fB\-raw\fR] 160[\fB\-hexdump\fR] 161[\fB\-asn1parse\fR] 162.SH "DESCRIPTION" 163.IX Header "DESCRIPTION" 164The \fBrsautl\fR command can be used to sign, verify, encrypt and decrypt 165data using the \s-1RSA\s0 algorithm. 166.SH "COMMAND OPTIONS" 167.IX Header "COMMAND OPTIONS" 168.Ip "\fB\-in filename\fR" 4 169.IX Item "-in filename" 170This specifies the input filename to read data from or standard input 171if this option is not specified. 172.Ip "\fB\-out filename\fR" 4 173.IX Item "-out filename" 174specifies the output filename to write to or standard output by 175default. 176.Ip "\fB\-inkey file\fR" 4 177.IX Item "-inkey file" 178the input key file, by default it should be an \s-1RSA\s0 private key. 179.Ip "\fB\-pubin\fR" 4 180.IX Item "-pubin" 181the input file is an \s-1RSA\s0 public key. 182.Ip "\fB\-certin\fR" 4 183.IX Item "-certin" 184the input is a certificate containing an \s-1RSA\s0 public key. 185.Ip "\fB\-sign\fR" 4 186.IX Item "-sign" 187sign the input data and output the signed result. This requires 188and \s-1RSA\s0 private key. 189.Ip "\fB\-verify\fR" 4 190.IX Item "-verify" 191verify the input data and output the recovered data. 192.Ip "\fB\-encrypt\fR" 4 193.IX Item "-encrypt" 194encrypt the input data using an \s-1RSA\s0 public key. 195.Ip "\fB\-decrypt\fR" 4 196.IX Item "-decrypt" 197decrypt the input data using an \s-1RSA\s0 private key. 198.Ip "\fB\-pkcs, \-oaep, \-ssl, \-raw\fR" 4 199.IX Item "-pkcs, -oaep, -ssl, -raw" 200the padding to use: PKCS#1 v1.5 (the default), PKCS#1 \s-1OAEP\s0, 201special padding used in \s-1SSL\s0 v2 backwards compatible handshakes, 202or no padding, respectively. 203For signatures, only \fB\-pkcs\fR and \fB\-raw\fR can be used. 204.Ip "\fB\-hexdump\fR" 4 205.IX Item "-hexdump" 206hex dump the output data. 207.Ip "\fB\-asn1parse\fR" 4 208.IX Item "-asn1parse" 209asn1parse the output data, this is useful when combined with the 210\&\fB\-verify\fR option. 211.SH "NOTES" 212.IX Header "NOTES" 213\&\fBrsautl\fR because it uses the \s-1RSA\s0 algorithm directly can only be 214used to sign or verify small pieces of data. 215.SH "EXAMPLES" 216.IX Header "EXAMPLES" 217Sign some data using a private key: 218.PP 219.Vb 1 220\& openssl rsautl -sign -in file -inkey key.pem -out sig 221.Ve 222Recover the signed data 223.PP 224.Vb 1 225\& openssl rsautl -verify -in sig -inkey key.pem 226.Ve 227Examine the raw signed data: 228.PP 229.Vb 1 230\& openssl rsautl -verify -in file -inkey key.pem -raw -hexdump 231.Ve 232.Vb 8 233\& 0000 - 00 01 ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................ 234\& 0010 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................ 235\& 0020 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................ 236\& 0030 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................ 237\& 0040 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................ 238\& 0050 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................ 239\& 0060 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................ 240\& 0070 - ff ff ff ff 00 68 65 6c-6c 6f 20 77 6f 72 6c 64 .....hello world 241.Ve 242The PKCS#1 block formatting is evident from this. If this was done using 243encrypt and decrypt the block would have been of type 2 (the second byte) 244and random padding data visible instead of the 0xff bytes. 245.PP 246It is possible to analyse the signature of certificates using this 247utility in conjunction with \fBasn1parse\fR. Consider the self signed 248example in certs/pca-cert.pem . Running \fBasn1parse\fR as follows yields: 249.PP 250.Vb 1 251\& openssl asn1parse -in pca-cert.pem 252.Ve 253.Vb 18 254\& 0:d=0 hl=4 l= 742 cons: SEQUENCE 255\& 4:d=1 hl=4 l= 591 cons: SEQUENCE 256\& 8:d=2 hl=2 l= 3 cons: cont [ 0 ] 257\& 10:d=3 hl=2 l= 1 prim: INTEGER :02 258\& 13:d=2 hl=2 l= 1 prim: INTEGER :00 259\& 16:d=2 hl=2 l= 13 cons: SEQUENCE 260\& 18:d=3 hl=2 l= 9 prim: OBJECT :md5WithRSAEncryption 261\& 29:d=3 hl=2 l= 0 prim: NULL 262\& 31:d=2 hl=2 l= 92 cons: SEQUENCE 263\& 33:d=3 hl=2 l= 11 cons: SET 264\& 35:d=4 hl=2 l= 9 cons: SEQUENCE 265\& 37:d=5 hl=2 l= 3 prim: OBJECT :countryName 266\& 42:d=5 hl=2 l= 2 prim: PRINTABLESTRING :AU 267\& .... 268\& 599:d=1 hl=2 l= 13 cons: SEQUENCE 269\& 601:d=2 hl=2 l= 9 prim: OBJECT :md5WithRSAEncryption 270\& 612:d=2 hl=2 l= 0 prim: NULL 271\& 614:d=1 hl=3 l= 129 prim: BIT STRING 272.Ve 273The final \s-1BIT\s0 \s-1STRING\s0 contains the actual signature. It can be extracted with: 274.PP 275.Vb 1 276\& openssl asn1parse -in pca-cert.pem -out sig -noout -strparse 614 277.Ve 278The certificate public key can be extracted with: 279.PP 280.Vb 1 281\& openssl x509 -in test/testx509.pem -pubout -noout >pubkey.pem 282.Ve 283The signature can be analysed with: 284.PP 285.Vb 1 286\& openssl rsautl -in sig -verify -asn1parse -inkey pubkey.pem -pubin 287.Ve 288.Vb 6 289\& 0:d=0 hl=2 l= 32 cons: SEQUENCE 290\& 2:d=1 hl=2 l= 12 cons: SEQUENCE 291\& 4:d=2 hl=2 l= 8 prim: OBJECT :md5 292\& 14:d=2 hl=2 l= 0 prim: NULL 293\& 16:d=1 hl=2 l= 16 prim: OCTET STRING 294\& 0000 - f3 46 9e aa 1a 4a 73 c9-37 ea 93 00 48 25 08 b5 .F...Js.7...H%.. 295.Ve 296This is the parsed version of an \s-1ASN1\s0 DigestInfo structure. It can be seen that 297the digest used was md5. The actual part of the certificate that was signed can 298be extracted with: 299.PP 300.Vb 1 301\& openssl asn1parse -in pca-cert.pem -out tbs -noout -strparse 4 302.Ve 303and its digest computed with: 304.PP 305.Vb 2 306\& openssl md5 -c tbs 307\& MD5(tbs)= f3:46:9e:aa:1a:4a:73:c9:37:ea:93:00:48:25:08:b5 308.Ve 309which it can be seen agrees with the recovered value above. 310.SH "SEE ALSO" 311.IX Header "SEE ALSO" 312dgst(1), rsa(1), genrsa(1)
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