/* * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved. * * Licensed under the OpenSSL license (the "License"). You may not use * this file except in compliance with the License. You can obtain a copy * in the file LICENSE in the source distribution or at * https://www.openssl.org/source/license.html */ #include #include #include #include "internal/cryptlib.h" #include #include #include #include #include #include #include #include "internal/asn1_int.h" #include #include #define MIN_LENGTH 4 static int load_iv(char **fromp, unsigned char *to, int num); static int check_pem(const char *nm, const char *name); int pem_check_suffix(const char *pem_str, const char *suffix); int PEM_def_callback(char *buf, int num, int w, void *key) { #if defined(OPENSSL_NO_STDIO) || defined(OPENSSL_NO_UI) int i; #else int i, j; const char *prompt; #endif if (key) { i = strlen(key); i = (i > num) ? num : i; memcpy(buf, key, i); return i; } #if defined(OPENSSL_NO_STDIO) || defined(OPENSSL_NO_UI) PEMerr(PEM_F_PEM_DEF_CALLBACK, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); return -1; #else prompt = EVP_get_pw_prompt(); if (prompt == NULL) prompt = "Enter PEM pass phrase:"; for (;;) { /* * We assume that w == 0 means decryption, * while w == 1 means encryption */ int min_len = w ? MIN_LENGTH : 0; i = EVP_read_pw_string_min(buf, min_len, num, prompt, w); if (i != 0) { PEMerr(PEM_F_PEM_DEF_CALLBACK, PEM_R_PROBLEMS_GETTING_PASSWORD); memset(buf, 0, (unsigned int)num); return -1; } j = strlen(buf); if (min_len && j < min_len) { fprintf(stderr, "phrase is too short, needs to be at least %d chars\n", min_len); } else break; } return j; #endif } void PEM_proc_type(char *buf, int type) { const char *str; if (type == PEM_TYPE_ENCRYPTED) str = "ENCRYPTED"; else if (type == PEM_TYPE_MIC_CLEAR) str = "MIC-CLEAR"; else if (type == PEM_TYPE_MIC_ONLY) str = "MIC-ONLY"; else str = "BAD-TYPE"; OPENSSL_strlcat(buf, "Proc-Type: 4,", PEM_BUFSIZE); OPENSSL_strlcat(buf, str, PEM_BUFSIZE); OPENSSL_strlcat(buf, "\n", PEM_BUFSIZE); } void PEM_dek_info(char *buf, const char *type, int len, char *str) { static const unsigned char map[17] = "0123456789ABCDEF"; long i; int j; OPENSSL_strlcat(buf, "DEK-Info: ", PEM_BUFSIZE); OPENSSL_strlcat(buf, type, PEM_BUFSIZE); OPENSSL_strlcat(buf, ",", PEM_BUFSIZE); j = strlen(buf); if (j + (len * 2) + 1 > PEM_BUFSIZE) return; for (i = 0; i < len; i++) { buf[j + i * 2] = map[(str[i] >> 4) & 0x0f]; buf[j + i * 2 + 1] = map[(str[i]) & 0x0f]; } buf[j + i * 2] = '\n'; buf[j + i * 2 + 1] = '\0'; } #ifndef OPENSSL_NO_STDIO void *PEM_ASN1_read(d2i_of_void *d2i, const char *name, FILE *fp, void **x, pem_password_cb *cb, void *u) { BIO *b; void *ret; if ((b = BIO_new(BIO_s_file())) == NULL) { PEMerr(PEM_F_PEM_ASN1_READ, ERR_R_BUF_LIB); return (0); } BIO_set_fp(b, fp, BIO_NOCLOSE); ret = PEM_ASN1_read_bio(d2i, name, b, x, cb, u); BIO_free(b); return (ret); } #endif static int check_pem(const char *nm, const char *name) { /* Normal matching nm and name */ if (strcmp(nm, name) == 0) return 1; /* Make PEM_STRING_EVP_PKEY match any private key */ if (strcmp(name, PEM_STRING_EVP_PKEY) == 0) { int slen; const EVP_PKEY_ASN1_METHOD *ameth; if (strcmp(nm, PEM_STRING_PKCS8) == 0) return 1; if (strcmp(nm, PEM_STRING_PKCS8INF) == 0) return 1; slen = pem_check_suffix(nm, "PRIVATE KEY"); if (slen > 0) { /* * NB: ENGINE implementations won't contain a deprecated old * private key decode function so don't look for them. */ ameth = EVP_PKEY_asn1_find_str(NULL, nm, slen); if (ameth && ameth->old_priv_decode) return 1; } return 0; } if (strcmp(name, PEM_STRING_PARAMETERS) == 0) { int slen; const EVP_PKEY_ASN1_METHOD *ameth; slen = pem_check_suffix(nm, "PARAMETERS"); if (slen > 0) { ENGINE *e; ameth = EVP_PKEY_asn1_find_str(&e, nm, slen); if (ameth) { int r; if (ameth->param_decode) r = 1; else r = 0; #ifndef OPENSSL_NO_ENGINE ENGINE_finish(e); #endif return r; } } return 0; } /* If reading DH parameters handle X9.42 DH format too */ if (strcmp(nm, PEM_STRING_DHXPARAMS) == 0 && strcmp(name, PEM_STRING_DHPARAMS) == 0) return 1; /* Permit older strings */ if (strcmp(nm, PEM_STRING_X509_OLD) == 0 && strcmp(name, PEM_STRING_X509) == 0) return 1; if (strcmp(nm, PEM_STRING_X509_REQ_OLD) == 0 && strcmp(name, PEM_STRING_X509_REQ) == 0) return 1; /* Allow normal certs to be read as trusted certs */ if (strcmp(nm, PEM_STRING_X509) == 0 && strcmp(name, PEM_STRING_X509_TRUSTED) == 0) return 1; if (strcmp(nm, PEM_STRING_X509_OLD) == 0 && strcmp(name, PEM_STRING_X509_TRUSTED) == 0) return 1; /* Some CAs use PKCS#7 with CERTIFICATE headers */ if (strcmp(nm, PEM_STRING_X509) == 0 && strcmp(name, PEM_STRING_PKCS7) == 0) return 1; if (strcmp(nm, PEM_STRING_PKCS7_SIGNED) == 0 && strcmp(name, PEM_STRING_PKCS7) == 0) return 1; #ifndef OPENSSL_NO_CMS if (strcmp(nm, PEM_STRING_X509) == 0 && strcmp(name, PEM_STRING_CMS) == 0) return 1; /* Allow CMS to be read from PKCS#7 headers */ if (strcmp(nm, PEM_STRING_PKCS7) == 0 && strcmp(name, PEM_STRING_CMS) == 0) return 1; #endif return 0; } int PEM_bytes_read_bio(unsigned char **pdata, long *plen, char **pnm, const char *name, BIO *bp, pem_password_cb *cb, void *u) { EVP_CIPHER_INFO cipher; char *nm = NULL, *header = NULL; unsigned char *data = NULL; long len; int ret = 0; for (;;) { if (!PEM_read_bio(bp, &nm, &header, &data, &len)) { if (ERR_GET_REASON(ERR_peek_error()) == PEM_R_NO_START_LINE) ERR_add_error_data(2, "Expecting: ", name); return 0; } if (check_pem(nm, name)) break; OPENSSL_free(nm); OPENSSL_free(header); OPENSSL_free(data); } if (!PEM_get_EVP_CIPHER_INFO(header, &cipher)) goto err; if (!PEM_do_header(&cipher, data, &len, cb, u)) goto err; *pdata = data; *plen = len; if (pnm) *pnm = nm; ret = 1; err: if (!ret || !pnm) OPENSSL_free(nm); OPENSSL_free(header); if (!ret) OPENSSL_free(data); return ret; } #ifndef OPENSSL_NO_STDIO int PEM_ASN1_write(i2d_of_void *i2d, const char *name, FILE *fp, void *x, const EVP_CIPHER *enc, unsigned char *kstr, int klen, pem_password_cb *callback, void *u) { BIO *b; int ret; if ((b = BIO_new(BIO_s_file())) == NULL) { PEMerr(PEM_F_PEM_ASN1_WRITE, ERR_R_BUF_LIB); return (0); } BIO_set_fp(b, fp, BIO_NOCLOSE); ret = PEM_ASN1_write_bio(i2d, name, b, x, enc, kstr, klen, callback, u); BIO_free(b); return (ret); } #endif int PEM_ASN1_write_bio(i2d_of_void *i2d, const char *name, BIO *bp, void *x, const EVP_CIPHER *enc, unsigned char *kstr, int klen, pem_password_cb *callback, void *u) { EVP_CIPHER_CTX *ctx = NULL; int dsize = 0, i = 0, j = 0, ret = 0; unsigned char *p, *data = NULL; const char *objstr = NULL; char buf[PEM_BUFSIZE]; unsigned char key[EVP_MAX_KEY_LENGTH]; unsigned char iv[EVP_MAX_IV_LENGTH]; if (enc != NULL) { objstr = OBJ_nid2sn(EVP_CIPHER_nid(enc)); if (objstr == NULL || EVP_CIPHER_iv_length(enc) == 0) { PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, PEM_R_UNSUPPORTED_CIPHER); goto err; } } if ((dsize = i2d(x, NULL)) < 0) { PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, ERR_R_ASN1_LIB); dsize = 0; goto err; } /* dzise + 8 bytes are needed */ /* actually it needs the cipher block size extra... */ data = OPENSSL_malloc((unsigned int)dsize + 20); if (data == NULL) { PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, ERR_R_MALLOC_FAILURE); goto err; } p = data; i = i2d(x, &p); if (enc != NULL) { if (kstr == NULL) { if (callback == NULL) klen = PEM_def_callback(buf, PEM_BUFSIZE, 1, u); else klen = (*callback) (buf, PEM_BUFSIZE, 1, u); if (klen <= 0) { PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, PEM_R_READ_KEY); goto err; } #ifdef CHARSET_EBCDIC /* Convert the pass phrase from EBCDIC */ ebcdic2ascii(buf, buf, klen); #endif kstr = (unsigned char *)buf; } RAND_add(data, i, 0); /* put in the RSA key. */ OPENSSL_assert(EVP_CIPHER_iv_length(enc) <= (int)sizeof(iv)); if (RAND_bytes(iv, EVP_CIPHER_iv_length(enc)) <= 0) /* Generate a salt */ goto err; /* * The 'iv' is used as the iv and as a salt. It is NOT taken from * the BytesToKey function */ if (!EVP_BytesToKey(enc, EVP_md5(), iv, kstr, klen, 1, key, NULL)) goto err; if (kstr == (unsigned char *)buf) OPENSSL_cleanse(buf, PEM_BUFSIZE); OPENSSL_assert(strlen(objstr) + 23 + 2 * EVP_CIPHER_iv_length(enc) + 13 <= sizeof buf); buf[0] = '\0'; PEM_proc_type(buf, PEM_TYPE_ENCRYPTED); PEM_dek_info(buf, objstr, EVP_CIPHER_iv_length(enc), (char *)iv); /* k=strlen(buf); */ ret = 1; if ((ctx = EVP_CIPHER_CTX_new()) == NULL || !EVP_EncryptInit_ex(ctx, enc, NULL, key, iv) || !EVP_EncryptUpdate(ctx, data, &j, data, i) || !EVP_EncryptFinal_ex(ctx, &(data[j]), &i)) ret = 0; if (ret == 0) goto err; i += j; } else { ret = 1; buf[0] = '\0'; } i = PEM_write_bio(bp, name, buf, data, i); if (i <= 0) ret = 0; err: OPENSSL_cleanse(key, sizeof(key)); OPENSSL_cleanse(iv, sizeof(iv)); EVP_CIPHER_CTX_free(ctx); OPENSSL_cleanse(buf, PEM_BUFSIZE); OPENSSL_clear_free(data, (unsigned int)dsize); return (ret); } int PEM_do_header(EVP_CIPHER_INFO *cipher, unsigned char *data, long *plen, pem_password_cb *callback, void *u) { int ok; int keylen; long len = *plen; int ilen = (int) len; /* EVP_DecryptUpdate etc. take int lengths */ EVP_CIPHER_CTX *ctx; unsigned char key[EVP_MAX_KEY_LENGTH]; char buf[PEM_BUFSIZE]; #if LONG_MAX > INT_MAX /* Check that we did not truncate the length */ if (len > INT_MAX) { PEMerr(PEM_F_PEM_DO_HEADER, PEM_R_HEADER_TOO_LONG); return 0; } #endif if (cipher->cipher == NULL) return 1; if (callback == NULL) keylen = PEM_def_callback(buf, PEM_BUFSIZE, 0, u); else keylen = callback(buf, PEM_BUFSIZE, 0, u); if (keylen <= 0) { PEMerr(PEM_F_PEM_DO_HEADER, PEM_R_BAD_PASSWORD_READ); return 0; } #ifdef CHARSET_EBCDIC /* Convert the pass phrase from EBCDIC */ ebcdic2ascii(buf, buf, keylen); #endif if (!EVP_BytesToKey(cipher->cipher, EVP_md5(), &(cipher->iv[0]), (unsigned char *)buf, keylen, 1, key, NULL)) return 0; ctx = EVP_CIPHER_CTX_new(); if (ctx == NULL) return 0; ok = EVP_DecryptInit_ex(ctx, cipher->cipher, NULL, key, &(cipher->iv[0])); if (ok) ok = EVP_DecryptUpdate(ctx, data, &ilen, data, ilen); if (ok) { /* Squirrel away the length of data decrypted so far. */ *plen = ilen; ok = EVP_DecryptFinal_ex(ctx, &(data[ilen]), &ilen); } if (ok) *plen += ilen; else PEMerr(PEM_F_PEM_DO_HEADER, PEM_R_BAD_DECRYPT); EVP_CIPHER_CTX_free(ctx); OPENSSL_cleanse((char *)buf, sizeof(buf)); OPENSSL_cleanse((char *)key, sizeof(key)); return ok; } /* * This implements a very limited PEM header parser that does not support the * full grammar of rfc1421. In particular, folded headers are not supported, * nor is additional whitespace. * * A robust implementation would make use of a library that turns the headers * into a BIO from which one folded line is read at a time, and is then split * into a header label and content. We would then parse the content of the * headers we care about. This is overkill for just this limited use-case, but * presumably we also parse rfc822-style headers for S/MIME, so a common * abstraction might well be more generally useful. */ int PEM_get_EVP_CIPHER_INFO(char *header, EVP_CIPHER_INFO *cipher) { static const char ProcType[] = "Proc-Type:"; static const char ENCRYPTED[] = "ENCRYPTED"; static const char DEKInfo[] = "DEK-Info:"; const EVP_CIPHER *enc = NULL; int ivlen; char *dekinfostart, c; cipher->cipher = NULL; if ((header == NULL) || (*header == '\0') || (*header == '\n')) return 1; if (strncmp(header, ProcType, sizeof(ProcType)-1) != 0) { PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_PROC_TYPE); return 0; } header += sizeof(ProcType)-1; header += strspn(header, " \t"); if (*header++ != '4' || *header++ != ',') return 0; header += strspn(header, " \t"); /* We expect "ENCRYPTED" followed by optional white-space + line break */ if (strncmp(header, ENCRYPTED, sizeof(ENCRYPTED)-1) != 0 || strspn(header+sizeof(ENCRYPTED)-1, " \t\r\n") == 0) { PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_ENCRYPTED); return 0; } header += sizeof(ENCRYPTED)-1; header += strspn(header, " \t\r"); if (*header++ != '\n') { PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_SHORT_HEADER); return 0; } /*- * https://tools.ietf.org/html/rfc1421#section-4.6.1.3 * We expect "DEK-Info: algo[,hex-parameters]" */ if (strncmp(header, DEKInfo, sizeof(DEKInfo)-1) != 0) { PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_DEK_INFO); return 0; } header += sizeof(DEKInfo)-1; header += strspn(header, " \t"); /* * DEK-INFO is a comma-separated combination of algorithm name and optional * parameters. */ dekinfostart = header; header += strcspn(header, " \t,"); c = *header; *header = '\0'; cipher->cipher = enc = EVP_get_cipherbyname(dekinfostart); *header = c; header += strspn(header, " \t"); if (enc == NULL) { PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_UNSUPPORTED_ENCRYPTION); return 0; } ivlen = EVP_CIPHER_iv_length(enc); if (ivlen > 0 && *header++ != ',') { PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_MISSING_DEK_IV); return 0; } else if (ivlen == 0 && *header == ',') { PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_UNEXPECTED_DEK_IV); return 0; } if (!load_iv(&header, cipher->iv, EVP_CIPHER_iv_length(enc))) return 0; return 1; } static int load_iv(char **fromp, unsigned char *to, int num) { int v, i; char *from; from = *fromp; for (i = 0; i < num; i++) to[i] = 0; num *= 2; for (i = 0; i < num; i++) { v = OPENSSL_hexchar2int(*from); if (v < 0) { PEMerr(PEM_F_LOAD_IV, PEM_R_BAD_IV_CHARS); return (0); } from++; to[i / 2] |= v << (long)((!(i & 1)) * 4); } *fromp = from; return (1); } #ifndef OPENSSL_NO_STDIO int PEM_write(FILE *fp, const char *name, const char *header, const unsigned char *data, long len) { BIO *b; int ret; if ((b = BIO_new(BIO_s_file())) == NULL) { PEMerr(PEM_F_PEM_WRITE, ERR_R_BUF_LIB); return (0); } BIO_set_fp(b, fp, BIO_NOCLOSE); ret = PEM_write_bio(b, name, header, data, len); BIO_free(b); return (ret); } #endif int PEM_write_bio(BIO *bp, const char *name, const char *header, const unsigned char *data, long len) { int nlen, n, i, j, outl; unsigned char *buf = NULL; EVP_ENCODE_CTX *ctx = EVP_ENCODE_CTX_new(); int reason = ERR_R_BUF_LIB; if (ctx == NULL) { reason = ERR_R_MALLOC_FAILURE; goto err; } EVP_EncodeInit(ctx); nlen = strlen(name); if ((BIO_write(bp, "-----BEGIN ", 11) != 11) || (BIO_write(bp, name, nlen) != nlen) || (BIO_write(bp, "-----\n", 6) != 6)) goto err; i = strlen(header); if (i > 0) { if ((BIO_write(bp, header, i) != i) || (BIO_write(bp, "\n", 1) != 1)) goto err; } buf = OPENSSL_malloc(PEM_BUFSIZE * 8); if (buf == NULL) { reason = ERR_R_MALLOC_FAILURE; goto err; } i = j = 0; while (len > 0) { n = (int)((len > (PEM_BUFSIZE * 5)) ? (PEM_BUFSIZE * 5) : len); if (!EVP_EncodeUpdate(ctx, buf, &outl, &(data[j]), n)) goto err; if ((outl) && (BIO_write(bp, (char *)buf, outl) != outl)) goto err; i += outl; len -= n; j += n; } EVP_EncodeFinal(ctx, buf, &outl); if ((outl > 0) && (BIO_write(bp, (char *)buf, outl) != outl)) goto err; if ((BIO_write(bp, "-----END ", 9) != 9) || (BIO_write(bp, name, nlen) != nlen) || (BIO_write(bp, "-----\n", 6) != 6)) goto err; OPENSSL_clear_free(buf, PEM_BUFSIZE * 8); EVP_ENCODE_CTX_free(ctx); return (i + outl); err: OPENSSL_clear_free(buf, PEM_BUFSIZE * 8); EVP_ENCODE_CTX_free(ctx); PEMerr(PEM_F_PEM_WRITE_BIO, reason); return (0); } #ifndef OPENSSL_NO_STDIO int PEM_read(FILE *fp, char **name, char **header, unsigned char **data, long *len) { BIO *b; int ret; if ((b = BIO_new(BIO_s_file())) == NULL) { PEMerr(PEM_F_PEM_READ, ERR_R_BUF_LIB); return (0); } BIO_set_fp(b, fp, BIO_NOCLOSE); ret = PEM_read_bio(b, name, header, data, len); BIO_free(b); return (ret); } #endif int PEM_read_bio(BIO *bp, char **name, char **header, unsigned char **data, long *len) { EVP_ENCODE_CTX *ctx = EVP_ENCODE_CTX_new(); int end = 0, i, k, bl = 0, hl = 0, nohead = 0; char buf[256]; BUF_MEM *nameB; BUF_MEM *headerB; BUF_MEM *dataB, *tmpB; if (ctx == NULL) { PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE); return (0); } nameB = BUF_MEM_new(); headerB = BUF_MEM_new(); dataB = BUF_MEM_new(); if ((nameB == NULL) || (headerB == NULL) || (dataB == NULL)) { goto err; } buf[254] = '\0'; for (;;) { i = BIO_gets(bp, buf, 254); if (i <= 0) { PEMerr(PEM_F_PEM_READ_BIO, PEM_R_NO_START_LINE); goto err; } while ((i >= 0) && (buf[i] <= ' ')) i--; buf[++i] = '\n'; buf[++i] = '\0'; if (strncmp(buf, "-----BEGIN ", 11) == 0) { i = strlen(&(buf[11])); if (strncmp(&(buf[11 + i - 6]), "-----\n", 6) != 0) continue; if (!BUF_MEM_grow(nameB, i + 9)) { PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE); goto err; } memcpy(nameB->data, &(buf[11]), i - 6); nameB->data[i - 6] = '\0'; break; } } hl = 0; if (!BUF_MEM_grow(headerB, 256)) { PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE); goto err; } headerB->data[0] = '\0'; for (;;) { i = BIO_gets(bp, buf, 254); if (i <= 0) break; while ((i >= 0) && (buf[i] <= ' ')) i--; buf[++i] = '\n'; buf[++i] = '\0'; if (buf[0] == '\n') break; if (!BUF_MEM_grow(headerB, hl + i + 9)) { PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE); goto err; } if (strncmp(buf, "-----END ", 9) == 0) { nohead = 1; break; } memcpy(&(headerB->data[hl]), buf, i); headerB->data[hl + i] = '\0'; hl += i; } bl = 0; if (!BUF_MEM_grow(dataB, 1024)) { PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE); goto err; } dataB->data[0] = '\0'; if (!nohead) { for (;;) { i = BIO_gets(bp, buf, 254); if (i <= 0) break; while ((i >= 0) && (buf[i] <= ' ')) i--; buf[++i] = '\n'; buf[++i] = '\0'; if (i != 65) end = 1; if (strncmp(buf, "-----END ", 9) == 0) break; if (i > 65) break; if (!BUF_MEM_grow_clean(dataB, i + bl + 9)) { PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE); goto err; } memcpy(&(dataB->data[bl]), buf, i); dataB->data[bl + i] = '\0'; bl += i; if (end) { buf[0] = '\0'; i = BIO_gets(bp, buf, 254); if (i <= 0) break; while ((i >= 0) && (buf[i] <= ' ')) i--; buf[++i] = '\n'; buf[++i] = '\0'; break; } } } else { tmpB = headerB; headerB = dataB; dataB = tmpB; bl = hl; } i = strlen(nameB->data); if ((strncmp(buf, "-----END ", 9) != 0) || (strncmp(nameB->data, &(buf[9]), i) != 0) || (strncmp(&(buf[9 + i]), "-----\n", 6) != 0)) { PEMerr(PEM_F_PEM_READ_BIO, PEM_R_BAD_END_LINE); goto err; } EVP_DecodeInit(ctx); i = EVP_DecodeUpdate(ctx, (unsigned char *)dataB->data, &bl, (unsigned char *)dataB->data, bl); if (i < 0) { PEMerr(PEM_F_PEM_READ_BIO, PEM_R_BAD_BASE64_DECODE); goto err; } i = EVP_DecodeFinal(ctx, (unsigned char *)&(dataB->data[bl]), &k); if (i < 0) { PEMerr(PEM_F_PEM_READ_BIO, PEM_R_BAD_BASE64_DECODE); goto err; } bl += k; if (bl == 0) goto err; *name = nameB->data; *header = headerB->data; *data = (unsigned char *)dataB->data; *len = bl; OPENSSL_free(nameB); OPENSSL_free(headerB); OPENSSL_free(dataB); EVP_ENCODE_CTX_free(ctx); return (1); err: BUF_MEM_free(nameB); BUF_MEM_free(headerB); BUF_MEM_free(dataB); EVP_ENCODE_CTX_free(ctx); return (0); } /* * Check pem string and return prefix length. If for example the pem_str == * "RSA PRIVATE KEY" and suffix = "PRIVATE KEY" the return value is 3 for the * string "RSA". */ int pem_check_suffix(const char *pem_str, const char *suffix) { int pem_len = strlen(pem_str); int suffix_len = strlen(suffix); const char *p; if (suffix_len + 1 >= pem_len) return 0; p = pem_str + pem_len - suffix_len; if (strcmp(p, suffix)) return 0; p--; if (*p != ' ') return 0; return p - pem_str; }