Commit | Line | Data |
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ac3ad426 | 1 | #include "pdkim-rsa.h" |
ac3ad426 AM |
2 | #include <stdlib.h> |
3 | #include <string.h> | |
4 | #include "polarssl/private-x509parse_c.h" | |
5 | ||
6 | /* PDKIM code (not copied from polarssl) */ | |
7 | /* | |
8 | * Parse a public RSA key | |
9 | ||
10 | OpenSSL RSA public key ASN1 container | |
11 | 0:d=0 hl=3 l= 159 cons: SEQUENCE | |
12 | 3:d=1 hl=2 l= 13 cons: SEQUENCE | |
13 | 5:d=2 hl=2 l= 9 prim: OBJECT:rsaEncryption | |
14 | 16:d=2 hl=2 l= 0 prim: NULL | |
15 | 18:d=1 hl=3 l= 141 prim: BIT STRING:RSAPublicKey (below) | |
16 | ||
17 | RSAPublicKey ASN1 container | |
18 | 0:d=0 hl=3 l= 137 cons: SEQUENCE | |
19 | 3:d=1 hl=3 l= 129 prim: INTEGER:Public modulus | |
20 | 135:d=1 hl=2 l= 3 prim: INTEGER:Public exponent | |
21 | */ | |
22 | ||
23 | int rsa_parse_public_key( rsa_context *rsa, unsigned char *buf, int buflen ) | |
24 | { | |
25 | unsigned char *p, *end; | |
26 | int ret, len; | |
27 | ||
28 | p = buf; | |
29 | end = buf+buflen; | |
30 | ||
31 | if( ( ret = asn1_get_tag( &p, end, &len, | |
32 | ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 ) { | |
33 | return( POLARSSL_ERR_X509_KEY_INVALID_FORMAT | ret ); | |
34 | } | |
35 | ||
36 | if( ( ret = asn1_get_tag( &p, end, &len, | |
37 | ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) == 0 ) { | |
38 | /* Skip over embedded rsaEncryption Object */ | |
39 | p+=len; | |
40 | ||
41 | /* The RSAPublicKey ASN1 container is wrapped in a BIT STRING */ | |
42 | if( ( ret = asn1_get_tag( &p, end, &len, | |
43 | ASN1_BIT_STRING ) ) != 0 ) { | |
44 | return( POLARSSL_ERR_X509_KEY_INVALID_FORMAT | ret ); | |
45 | } | |
46 | ||
47 | /* Limit range to that BIT STRING */ | |
48 | end = p + len; | |
49 | p++; | |
50 | ||
51 | if( ( ret = asn1_get_tag( &p, end, &len, | |
52 | ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 ) { | |
53 | return( POLARSSL_ERR_X509_KEY_INVALID_FORMAT | ret ); | |
54 | } | |
55 | } | |
56 | ||
57 | if ( ( ( ret = asn1_get_mpi( &p, end, &(rsa->N) ) ) == 0 ) && | |
58 | ( ( ret = asn1_get_mpi( &p, end, &(rsa->E) ) ) == 0 ) ) { | |
59 | rsa->len = mpi_size( &rsa->N ); | |
60 | return 0; | |
61 | } | |
62 | ||
63 | return( POLARSSL_ERR_X509_KEY_INVALID_FORMAT | ret ); | |
64 | } | |
65 | ||
66 | /* | |
67 | * Parse a private RSA key | |
68 | */ | |
69 | int rsa_parse_key( rsa_context *rsa, unsigned char *buf, int buflen, | |
70 | unsigned char *pwd, int pwdlen ) | |
71 | { | |
72 | int ret, len, enc; | |
73 | unsigned char *s1, *s2; | |
74 | unsigned char *p, *end; | |
75 | ||
76 | s1 = (unsigned char *) strstr( (char *) buf, | |
77 | "-----BEGIN RSA PRIVATE KEY-----" ); | |
78 | ||
79 | if( s1 != NULL ) | |
80 | { | |
81 | s2 = (unsigned char *) strstr( (char *) buf, | |
82 | "-----END RSA PRIVATE KEY-----" ); | |
83 | ||
84 | if( s2 == NULL || s2 <= s1 ) | |
69a70afa JH |
85 | { |
86 | debug_printf("rsa_parse_key: err 1\n"); | |
ac3ad426 | 87 | return( POLARSSL_ERR_X509_KEY_INVALID_PEM ); |
69a70afa | 88 | } |
ac3ad426 AM |
89 | |
90 | s1 += 31; | |
91 | if( *s1 == '\r' ) s1++; | |
92 | if( *s1 == '\n' ) s1++; | |
69a70afa JH |
93 | else |
94 | { | |
95 | debug_printf("rsa_parse_key: err 2\n"); | |
96 | return( POLARSSL_ERR_X509_KEY_INVALID_PEM ); | |
97 | } | |
ac3ad426 AM |
98 | |
99 | enc = 0; | |
100 | ||
101 | if( memcmp( s1, "Proc-Type: 4,ENCRYPTED", 22 ) == 0 ) | |
102 | { | |
69a70afa | 103 | debug_printf("rsa_parse_key: err 3\n"); |
ac3ad426 AM |
104 | return( POLARSSL_ERR_X509_FEATURE_UNAVAILABLE ); |
105 | } | |
106 | ||
107 | len = 0; | |
f4d091fb JH |
108 | { |
109 | extern unsigned char * string_copyn(const unsigned char *, int); | |
110 | extern int b64decode(unsigned char *, unsigned char **); | |
111 | #define POLARSSL_ERR_BASE64_INVALID_CHARACTER 0x0012 | |
ac3ad426 | 112 | |
f4d091fb JH |
113 | s1 = string_copyn(s1, s2-s1); /* need nul-terminated string */ |
114 | if ((len = b64decode(s1, &buf)) < 0) | |
69a70afa JH |
115 | { |
116 | debug_printf("rsa_parse_key: err 4\n"); | |
f4d091fb JH |
117 | return POLARSSL_ERR_BASE64_INVALID_CHARACTER |
118 | | POLARSSL_ERR_X509_KEY_INVALID_PEM; | |
69a70afa | 119 | } |
f4d091fb | 120 | } |
ac3ad426 AM |
121 | |
122 | buflen = len; | |
123 | ||
124 | if( enc != 0 ) | |
125 | { | |
69a70afa | 126 | debug_printf("rsa_parse_key: err 5\n"); |
ac3ad426 AM |
127 | return( POLARSSL_ERR_X509_FEATURE_UNAVAILABLE ); |
128 | } | |
129 | } | |
130 | ||
131 | memset( rsa, 0, sizeof( rsa_context ) ); | |
132 | ||
133 | p = buf; | |
134 | end = buf + buflen; | |
135 | ||
136 | /* | |
137 | * RSAPrivateKey ::= SEQUENCE { | |
138 | * version Version, | |
139 | * modulus INTEGER, -- n | |
140 | * publicExponent INTEGER, -- e | |
141 | * privateExponent INTEGER, -- d | |
142 | * prime1 INTEGER, -- p | |
143 | * prime2 INTEGER, -- q | |
144 | * exponent1 INTEGER, -- d mod (p-1) | |
145 | * exponent2 INTEGER, -- d mod (q-1) | |
146 | * coefficient INTEGER, -- (inverse of q) mod p | |
147 | * otherPrimeInfos OtherPrimeInfos OPTIONAL | |
148 | * } | |
149 | */ | |
150 | if( ( ret = asn1_get_tag( &p, end, &len, | |
151 | ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 ) | |
152 | { | |
ac3ad426 | 153 | rsa_free( rsa ); |
69a70afa | 154 | debug_printf("rsa_parse_key: err 6\n"); |
ac3ad426 AM |
155 | return( POLARSSL_ERR_X509_KEY_INVALID_FORMAT | ret ); |
156 | } | |
157 | ||
158 | end = p + len; | |
159 | ||
160 | if( ( ret = asn1_get_int( &p, end, &rsa->ver ) ) != 0 ) | |
161 | { | |
ac3ad426 | 162 | rsa_free( rsa ); |
69a70afa | 163 | debug_printf("rsa_parse_key: err 7\n"); |
ac3ad426 AM |
164 | return( POLARSSL_ERR_X509_KEY_INVALID_FORMAT | ret ); |
165 | } | |
166 | ||
167 | if( rsa->ver != 0 ) | |
168 | { | |
ac3ad426 | 169 | rsa_free( rsa ); |
69a70afa | 170 | debug_printf("rsa_parse_key: err 8\n"); |
ac3ad426 AM |
171 | return( ret | POLARSSL_ERR_X509_KEY_INVALID_VERSION ); |
172 | } | |
173 | ||
174 | if( ( ret = asn1_get_mpi( &p, end, &rsa->N ) ) != 0 || | |
175 | ( ret = asn1_get_mpi( &p, end, &rsa->E ) ) != 0 || | |
176 | ( ret = asn1_get_mpi( &p, end, &rsa->D ) ) != 0 || | |
177 | ( ret = asn1_get_mpi( &p, end, &rsa->P ) ) != 0 || | |
178 | ( ret = asn1_get_mpi( &p, end, &rsa->Q ) ) != 0 || | |
179 | ( ret = asn1_get_mpi( &p, end, &rsa->DP ) ) != 0 || | |
180 | ( ret = asn1_get_mpi( &p, end, &rsa->DQ ) ) != 0 || | |
181 | ( ret = asn1_get_mpi( &p, end, &rsa->QP ) ) != 0 ) | |
182 | { | |
ac3ad426 | 183 | rsa_free( rsa ); |
69a70afa | 184 | debug_printf("rsa_parse_key: err 9\n"); |
ac3ad426 AM |
185 | return( ret | POLARSSL_ERR_X509_KEY_INVALID_FORMAT ); |
186 | } | |
187 | ||
188 | rsa->len = mpi_size( &rsa->N ); | |
189 | ||
190 | if( p != end ) | |
191 | { | |
ac3ad426 | 192 | rsa_free( rsa ); |
69a70afa | 193 | debug_printf("rsa_parse_key: err 10\n"); |
ac3ad426 AM |
194 | return( POLARSSL_ERR_X509_KEY_INVALID_FORMAT | |
195 | POLARSSL_ERR_ASN1_LENGTH_MISMATCH ); | |
196 | } | |
197 | ||
198 | if( ( ret = rsa_check_privkey( rsa ) ) != 0 ) | |
199 | { | |
ac3ad426 | 200 | rsa_free( rsa ); |
69a70afa | 201 | debug_printf("rsa_parse_key: err 11\n"); |
ac3ad426 AM |
202 | return( ret ); |
203 | } | |
204 | ||
ac3ad426 AM |
205 | return( 0 ); |
206 | } |